^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * linux/fs/ext4/namei.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (C) 1992, 1993, 1994, 1995
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Remy Card (card@masi.ibp.fr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Laboratoire MASI - Institut Blaise Pascal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Universite Pierre et Marie Curie (Paris VI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * linux/fs/minix/namei.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Copyright (C) 1991, 1992 Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Big-endian to little-endian byte-swapping/bitmaps by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * David S. Miller (davem@caip.rutgers.edu), 1995
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * Directory entry file type support and forward compatibility hooks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Hash Tree Directory indexing (c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * Daniel Phillips, 2001
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Hash Tree Directory indexing porting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * Christopher Li, 2002
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * Hash Tree Directory indexing cleanup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * Theodore Ts'o, 2002
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <linux/time.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <linux/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <linux/quotaops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <linux/buffer_head.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <linux/bio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <linux/iversion.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <linux/unicode.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include "ext4.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include "ext4_jbd2.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include "xattr.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include "acl.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <trace/events/ext4.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) * define how far ahead to read directories while searching them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) #define NAMEI_RA_CHUNKS 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #define NAMEI_RA_BLOCKS 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) #define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) static struct buffer_head *ext4_append(handle_t *handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) ext4_lblk_t *block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ((inode->i_size >> 10) >=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) EXT4_SB(inode->i_sb)->s_max_dir_size_kb)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return ERR_PTR(-ENOSPC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) *block = inode->i_size >> inode->i_sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) inode->i_size += inode->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) EXT4_I(inode)->i_disksize = inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) BUFFER_TRACE(bh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) err = ext4_journal_get_write_access(handle, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) ext4_std_error(inode->i_sb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) static int ext4_dx_csum_verify(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct ext4_dir_entry *dirent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) * Hints to ext4_read_dirblock regarding whether we expect a directory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) * block being read to be an index block, or a block containing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) * directory entries (and if the latter, whether it was found via a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) * logical block in an htree index block). This is used to control
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) * what sort of sanity checkinig ext4_read_dirblock() will do on the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) * directory block read from the storage device. EITHER will means
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) * the caller doesn't know what kind of directory block will be read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) * so no specific verification will be done.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) typedef enum {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) EITHER, INDEX, DIRENT, DIRENT_HTREE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) } dirblock_type_t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) #define ext4_read_dirblock(inode, block, type) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) __ext4_read_dirblock((inode), (block), (type), __func__, __LINE__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) ext4_lblk_t block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) dirblock_type_t type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) const char *func,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) unsigned int line)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) struct ext4_dir_entry *dirent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) int is_dx_block = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) if (ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_EIO))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) bh = ERR_PTR(-EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) bh = ext4_bread(NULL, inode, block, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) if (IS_ERR(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) __ext4_warning(inode->i_sb, func, line,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) "inode #%lu: lblock %lu: comm %s: "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) "error %ld reading directory block",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) inode->i_ino, (unsigned long)block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) current->comm, PTR_ERR(bh));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) if (!bh && (type == INDEX || type == DIRENT_HTREE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) ext4_error_inode(inode, func, line, block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) "Directory hole found for htree %s block",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) (type == INDEX) ? "index" : "leaf");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) return ERR_PTR(-EFSCORRUPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) dirent = (struct ext4_dir_entry *) bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) /* Determine whether or not we have an index block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (is_dx(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) if (block == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) is_dx_block = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) else if (ext4_rec_len_from_disk(dirent->rec_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) inode->i_sb->s_blocksize) ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) inode->i_sb->s_blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) is_dx_block = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) if (!is_dx_block && type == INDEX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) ext4_error_inode(inode, func, line, block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) "directory leaf block found instead of index block");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) return ERR_PTR(-EFSCORRUPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) if (!ext4_has_metadata_csum(inode->i_sb) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) buffer_verified(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) * An empty leaf block can get mistaken for a index block; for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) * this reason, we can only check the index checksum when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) * caller is sure it should be an index block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (is_dx_block && type == INDEX) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (ext4_dx_csum_verify(inode, dirent) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) !ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) set_buffer_verified(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) ext4_error_inode_err(inode, func, line, block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) EFSBADCRC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) "Directory index failed checksum");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) return ERR_PTR(-EFSBADCRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) if (!is_dx_block) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) if (ext4_dirblock_csum_verify(inode, bh) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) !ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) set_buffer_verified(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) ext4_error_inode_err(inode, func, line, block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) EFSBADCRC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) "Directory block failed checksum");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) return ERR_PTR(-EFSBADCRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) #ifndef assert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) #define assert(test) J_ASSERT(test)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) #ifdef DX_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) #define dxtrace(command) command
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) #define dxtrace(command)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct fake_dirent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) __le32 inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) __le16 rec_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) u8 name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) u8 file_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) struct dx_countlimit
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) __le16 limit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) __le16 count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) struct dx_entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) __le32 hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) __le32 block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) * dx_root_info is laid out so that if it should somehow get overlaid by a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) * dirent the two low bits of the hash version will be zero. Therefore, the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) * hash version mod 4 should never be 0. Sincerely, the paranoia department.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) struct dx_root
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) struct fake_dirent dot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) char dot_name[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct fake_dirent dotdot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) char dotdot_name[4];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) struct dx_root_info
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) __le32 reserved_zero;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) u8 hash_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) u8 info_length; /* 8 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) u8 indirect_levels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) u8 unused_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) struct dx_entry entries[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) struct dx_node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) struct fake_dirent fake;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) struct dx_entry entries[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) struct dx_frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) struct dx_entry *entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) struct dx_entry *at;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) struct dx_map_entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) u32 hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) u16 offs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) u16 size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) * This goes at the end of each htree block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) struct dx_tail {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) u32 dt_reserved;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) __le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) static inline unsigned dx_get_hash(struct dx_entry *entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) static void dx_set_hash(struct dx_entry *entry, unsigned value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) static unsigned dx_get_count(struct dx_entry *entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static unsigned dx_get_limit(struct dx_entry *entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) static void dx_set_count(struct dx_entry *entries, unsigned value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static void dx_set_limit(struct dx_entry *entries, unsigned value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) static unsigned dx_root_limit(struct inode *dir, unsigned infosize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) static unsigned dx_node_limit(struct inode *dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) static struct dx_frame *dx_probe(struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) struct dx_hash_info *hinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) struct dx_frame *frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) static void dx_release(struct dx_frame *frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) unsigned blocksize, struct dx_hash_info *hinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) struct dx_map_entry map[]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static void dx_sort_map(struct dx_map_entry *map, unsigned count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) static struct ext4_dir_entry_2 *dx_move_dirents(struct inode *dir, char *from,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) char *to, struct dx_map_entry *offsets,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) int count, unsigned int blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) static struct ext4_dir_entry_2 *dx_pack_dirents(struct inode *dir, char *base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) unsigned int blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) static void dx_insert_block(struct dx_frame *frame,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) u32 hash, ext4_lblk_t block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) static int ext4_htree_next_block(struct inode *dir, __u32 hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) struct dx_frame *frame,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) struct dx_frame *frames,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) __u32 *start_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) struct ext4_dir_entry_2 **res_dir, ext4_lblk_t *lblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) struct inode *dir, struct inode *inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) /* checksumming functions */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) void ext4_initialize_dirent_tail(struct buffer_head *bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) unsigned int blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) struct ext4_dir_entry_tail *t = EXT4_DIRENT_TAIL(bh->b_data, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) memset(t, 0, sizeof(struct ext4_dir_entry_tail));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) t->det_rec_len = ext4_rec_len_to_disk(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) sizeof(struct ext4_dir_entry_tail), blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) t->det_reserved_ft = EXT4_FT_DIR_CSUM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) /* Walk through a dirent block to find a checksum "dirent" at the tail */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) struct ext4_dir_entry_tail *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) #ifdef PARANOID
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) struct ext4_dir_entry *d, *top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) d = (struct ext4_dir_entry *)bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) top = (struct ext4_dir_entry *)(bh->b_data +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) (EXT4_BLOCK_SIZE(inode->i_sb) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) sizeof(struct ext4_dir_entry_tail)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) while (d < top && d->rec_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) d = (struct ext4_dir_entry *)(((void *)d) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) le16_to_cpu(d->rec_len));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (d != top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) t = (struct ext4_dir_entry_tail *)d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) t = EXT4_DIRENT_TAIL(bh->b_data, EXT4_BLOCK_SIZE(inode->i_sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) if (t->det_reserved_zero1 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) t->det_reserved_zero2 ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) t->det_reserved_ft != EXT4_FT_DIR_CSUM)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) return t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) static __le32 ext4_dirblock_csum(struct inode *inode, void *dirent, int size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) struct ext4_inode_info *ei = EXT4_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) __u32 csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) return cpu_to_le32(csum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) #define warn_no_space_for_csum(inode) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) __warn_no_space_for_csum((inode), __func__, __LINE__)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) static void __warn_no_space_for_csum(struct inode *inode, const char *func,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) unsigned int line)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) __ext4_warning_inode(inode, func, line,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) "No space for directory leaf checksum. Please run e2fsck -D.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) int ext4_dirblock_csum_verify(struct inode *inode, struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) struct ext4_dir_entry_tail *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) if (!ext4_has_metadata_csum(inode->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) t = get_dirent_tail(inode, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) if (!t) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) warn_no_space_for_csum(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (t->det_checksum != ext4_dirblock_csum(inode, bh->b_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) (char *)t - bh->b_data))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) static void ext4_dirblock_csum_set(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) struct ext4_dir_entry_tail *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) if (!ext4_has_metadata_csum(inode->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) t = get_dirent_tail(inode, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) if (!t) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) warn_no_space_for_csum(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) t->det_checksum = ext4_dirblock_csum(inode, bh->b_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) (char *)t - bh->b_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) int ext4_handle_dirty_dirblock(handle_t *handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) ext4_dirblock_csum_set(inode, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) return ext4_handle_dirty_metadata(handle, inode, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) static struct dx_countlimit *get_dx_countlimit(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) struct ext4_dir_entry *dirent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) int *offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) struct ext4_dir_entry *dp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) struct dx_root_info *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) int count_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) count_offset = 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) else if (le16_to_cpu(dirent->rec_len) == 12) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) dp = (struct ext4_dir_entry *)(((void *)dirent) + 12);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) if (le16_to_cpu(dp->rec_len) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) EXT4_BLOCK_SIZE(inode->i_sb) - 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) root = (struct dx_root_info *)(((void *)dp + 12));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (root->reserved_zero ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) root->info_length != sizeof(struct dx_root_info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) count_offset = 32;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) if (offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) *offset = count_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return (struct dx_countlimit *)(((void *)dirent) + count_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) int count_offset, int count, struct dx_tail *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) struct ext4_inode_info *ei = EXT4_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) __u32 csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) int size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) __u32 dummy_csum = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) int offset = offsetof(struct dx_tail, dt_checksum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) size = count_offset + (count * sizeof(struct dx_entry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) csum = ext4_chksum(sbi, csum, (__u8 *)t, offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) return cpu_to_le32(csum);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) static int ext4_dx_csum_verify(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) struct ext4_dir_entry *dirent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465) struct dx_countlimit *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) struct dx_tail *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) int count_offset, limit, count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) if (!ext4_has_metadata_csum(inode->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) c = get_dx_countlimit(inode, dirent, &count_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) if (!c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) limit = le16_to_cpu(c->limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) count = le16_to_cpu(c->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) if (count_offset + (limit * sizeof(struct dx_entry)) >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) warn_no_space_for_csum(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) count, t))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) struct dx_countlimit *c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) struct dx_tail *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) int count_offset, limit, count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) if (!ext4_has_metadata_csum(inode->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) c = get_dx_countlimit(inode, dirent, &count_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) if (!c) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) limit = le16_to_cpu(c->limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) count = le16_to_cpu(c->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) if (count_offset + (limit * sizeof(struct dx_entry)) >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) warn_no_space_for_csum(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) static inline int ext4_handle_dirty_dx_node(handle_t *handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) return ext4_handle_dirty_metadata(handle, inode, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) * p is at least 6 bytes before the end of page
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) static inline struct ext4_dir_entry_2 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) return (struct ext4_dir_entry_2 *)((char *)p +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) ext4_rec_len_from_disk(p->rec_len, blocksize));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) * Future: use high four bits of block for coalesce-on-delete flags
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) * Mask them off for now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) static inline ext4_lblk_t dx_get_block(struct dx_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) return le32_to_cpu(entry->block) & 0x0fffffff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) entry->block = cpu_to_le32(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) static inline unsigned dx_get_hash(struct dx_entry *entry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) return le32_to_cpu(entry->hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) static inline void dx_set_hash(struct dx_entry *entry, unsigned value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) entry->hash = cpu_to_le32(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) static inline unsigned dx_get_count(struct dx_entry *entries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) return le16_to_cpu(((struct dx_countlimit *) entries)->count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) static inline unsigned dx_get_limit(struct dx_entry *entries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) static inline void dx_set_count(struct dx_entry *entries, unsigned value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) ((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) static inline void dx_set_limit(struct dx_entry *entries, unsigned value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) ((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) unsigned int entry_space = dir->i_sb->s_blocksize -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) ext4_dir_rec_len(1, NULL) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) ext4_dir_rec_len(2, NULL) - infosize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) if (ext4_has_metadata_csum(dir->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) entry_space -= sizeof(struct dx_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) return entry_space / sizeof(struct dx_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) static inline unsigned dx_node_limit(struct inode *dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) unsigned int entry_space = dir->i_sb->s_blocksize -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) ext4_dir_rec_len(0, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) if (ext4_has_metadata_csum(dir->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) entry_space -= sizeof(struct dx_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) return entry_space / sizeof(struct dx_entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) * Debug
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) #ifdef DX_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) static void dx_show_index(char * label, struct dx_entry *entries)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) int i, n = dx_get_count (entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) printk(KERN_DEBUG "%s index", label);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) for (i = 0; i < n; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) printk(KERN_CONT " %x->%lu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) i ? dx_get_hash(entries + i) : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) (unsigned long)dx_get_block(entries + i));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) printk(KERN_CONT "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) struct stats
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) unsigned names;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) unsigned space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) unsigned bcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) static struct stats dx_show_leaf(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) struct dx_hash_info *hinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) struct ext4_dir_entry_2 *de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) int size, int show_names)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) unsigned names = 0, space = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) char *base = (char *) de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) struct dx_hash_info h = *hinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) printk("names: ");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) while ((char *) de < base + size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) if (de->inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) if (show_names)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) #ifdef CONFIG_FS_ENCRYPTION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) struct fscrypt_str fname_crypto_str =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) FSTR_INIT(NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) int res = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) name = de->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) len = de->name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) if (!IS_ENCRYPTED(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) /* Directory is not encrypted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) ext4fs_dirhash(dir, de->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) de->name_len, &h);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) printk("%*.s:(U)%x.%u ", len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) name, h.hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) (unsigned) ((char *) de
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) - base));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) struct fscrypt_str de_name =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) FSTR_INIT(name, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) /* Directory is encrypted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) res = fscrypt_fname_alloc_buffer(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) len, &fname_crypto_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) printk(KERN_WARNING "Error "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) "allocating crypto "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) "buffer--skipping "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) "crypto\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) res = fscrypt_fname_disk_to_usr(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) 0, 0, &de_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) &fname_crypto_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) printk(KERN_WARNING "Error "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) "converting filename "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) "from disk to usr"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) "\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) name = "??";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) len = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) name = fname_crypto_str.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) len = fname_crypto_str.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) if (IS_CASEFOLDED(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) h.hash = EXT4_DIRENT_HASH(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) ext4fs_dirhash(dir, de->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) de->name_len, &h);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) printk("%*.s:(E)%x.%u ", len, name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) h.hash, (unsigned) ((char *) de
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) - base));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) fscrypt_fname_free_buffer(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) &fname_crypto_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) int len = de->name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) char *name = de->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) ext4fs_dirhash(dir, de->name, de->name_len, &h);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) printk("%*.s:%x.%u ", len, name, h.hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) (unsigned) ((char *) de - base));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) space += ext4_dir_rec_len(de->name_len, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) names++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) de = ext4_next_entry(de, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) printk(KERN_CONT "(%i)\n", names);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) return (struct stats) { names, space, 1 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) struct dx_entry *entries, int levels)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) unsigned blocksize = dir->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) unsigned count = dx_get_count(entries), names = 0, space = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) unsigned bcount = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) printk("%i indexed blocks...\n", count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) for (i = 0; i < count; i++, entries++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) ext4_lblk_t block = dx_get_block(entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) ext4_lblk_t hash = i ? dx_get_hash(entries): 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) struct stats stats;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) bh = ext4_bread(NULL,dir, block, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) if (!bh || IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) stats = levels?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) bh->b_data, blocksize, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) names += stats.names;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) space += stats.space;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) bcount += stats.bcount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) if (bcount)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) levels ? "" : " ", names, space/bcount,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) (space/bcount)*100/blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) return (struct stats) { names, space, bcount};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) #endif /* DX_DEBUG */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) * Probe for a directory leaf block to search.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) * dx_probe can return ERR_BAD_DX_DIR, which means there was a format
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) * error in the directory index, and the caller should fall back to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) * searching the directory normally. The callers of dx_probe **MUST**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) * check for this error code, and make sure it never gets reflected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) * back to userspace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) static struct dx_frame *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) dx_probe(struct ext4_filename *fname, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) struct dx_hash_info *hinfo, struct dx_frame *frame_in)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760) unsigned count, indirect;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) struct dx_entry *at, *entries, *p, *q, *m;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) struct dx_root *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) struct dx_frame *frame = frame_in;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) u32 hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) memset(frame_in, 0, EXT4_HTREE_LEVEL * sizeof(frame_in[0]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) frame->bh = ext4_read_dirblock(dir, 0, INDEX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) if (IS_ERR(frame->bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) return (struct dx_frame *) frame->bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) root = (struct dx_root *) frame->bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) if (root->info.hash_version != DX_HASH_TEA &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) root->info.hash_version != DX_HASH_HALF_MD4 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) root->info.hash_version != DX_HASH_LEGACY &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) root->info.hash_version != DX_HASH_SIPHASH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) ext4_warning_inode(dir, "Unrecognised inode hash code %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) root->info.hash_version);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) if (ext4_hash_in_dirent(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) if (root->info.hash_version != DX_HASH_SIPHASH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) ext4_warning_inode(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) "Hash in dirent, but hash is not SIPHASH");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) if (root->info.hash_version == DX_HASH_SIPHASH) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) ext4_warning_inode(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790) "Hash code is SIPHASH, but hash not in dirent");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794) if (fname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) hinfo = &fname->hinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) hinfo->hash_version = root->info.hash_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) if (hinfo->hash_version <= DX_HASH_TEA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) /* hash is already computed for encrypted casefolded directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801) if (fname && fname_name(fname) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) !(IS_ENCRYPTED(dir) && IS_CASEFOLDED(dir)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), hinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804) hash = hinfo->hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) if (root->info.unused_flags & 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) ext4_warning_inode(dir, "Unimplemented hash flags: %#06x",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808) root->info.unused_flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) indirect = root->info.indirect_levels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) if (indirect >= ext4_dir_htree_level(dir->i_sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814) ext4_warning(dir->i_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) "Directory (ino: %lu) htree depth %#06x exceed"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816) "supported value", dir->i_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) ext4_dir_htree_level(dir->i_sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) if (ext4_dir_htree_level(dir->i_sb) < EXT4_HTREE_LEVEL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) ext4_warning(dir->i_sb, "Enable large directory "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) "feature to access it");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825) entries = (struct dx_entry *)(((char *)&root->info) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) root->info.info_length);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) if (dx_get_limit(entries) != dx_root_limit(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) root->info.info_length)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) ext4_warning_inode(dir, "dx entry: limit %u != root limit %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) dx_get_limit(entries),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) dx_root_limit(dir, root->info.info_length));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) dxtrace(printk("Look up %x", hash));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838) count = dx_get_count(entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) if (!count || count > dx_get_limit(entries)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) ext4_warning_inode(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) "dx entry: count %u beyond limit %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842) count, dx_get_limit(entries));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) p = entries + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) q = entries + count - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) while (p <= q) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) m = p + (q - p) / 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850) dxtrace(printk(KERN_CONT "."));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) if (dx_get_hash(m) > hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) q = m - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) p = m + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) if (0) { // linear search cross check
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) unsigned n = count - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) at = entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) while (n--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862) dxtrace(printk(KERN_CONT ","));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) if (dx_get_hash(++at) > hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) at--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) assert (at == p - 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) at = p - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) dxtrace(printk(KERN_CONT " %x->%u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) at == entries ? 0 : dx_get_hash(at),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875) dx_get_block(at)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) frame->entries = entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) frame->at = at;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) if (!indirect--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879) return frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) frame++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882) if (IS_ERR(frame->bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) ret_err = (struct dx_frame *) frame->bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) frame->bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) entries = ((struct dx_node *) frame->bh->b_data)->entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) if (dx_get_limit(entries) != dx_node_limit(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) ext4_warning_inode(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891) "dx entry: limit %u != node limit %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) dx_get_limit(entries), dx_node_limit(dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) while (frame >= frame_in) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) brelse(frame->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) frame--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) if (ret_err == ERR_PTR(ERR_BAD_DX_DIR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903) ext4_warning_inode(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) "Corrupt directory, running e2fsck is recommended");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) return ret_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) static void dx_release(struct dx_frame *frames)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) struct dx_root_info *info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) unsigned int indirect_levels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) if (frames[0].bh == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) info = &((struct dx_root *)frames[0].bh->b_data)->info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) /* save local copy, "info" may be freed after brelse() */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) indirect_levels = info->indirect_levels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) for (i = 0; i <= indirect_levels; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) if (frames[i].bh == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923) brelse(frames[i].bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) frames[i].bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) * This function increments the frame pointer to search the next leaf
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930) * block, and reads in the necessary intervening nodes if the search
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) * should be necessary. Whether or not the search is necessary is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) * controlled by the hash parameter. If the hash value is even, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933) * the search is only continued if the next block starts with that
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) * hash value. This is used if we are searching for a specific file.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) * If the hash value is HASH_NB_ALWAYS, then always go to the next block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) * This function returns 1 if the caller should continue to search,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) * or 0 if it should not. If there is an error reading one of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940) * index blocks, it will a negative error code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) * If start_hash is non-null, it will be filled in with the starting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943) * hash of the next page.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) static int ext4_htree_next_block(struct inode *dir, __u32 hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) struct dx_frame *frame,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947) struct dx_frame *frames,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) __u32 *start_hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) struct dx_frame *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952) int num_frames = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) __u32 bhash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) p = frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957) * Find the next leaf page by incrementing the frame pointer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) * If we run out of entries in the interior node, loop around and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) * increment pointer in the parent node. When we break out of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960) * this loop, num_frames indicates the number of interior
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) * nodes need to be read.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) if (++(p->at) < p->entries + dx_get_count(p->entries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) if (p == frames)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968) num_frames++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) p--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) * If the hash is 1, then continue only if the next page has a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) * continuation hash of any value. This is used for readdir
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) * handling. Otherwise, check to see if the hash matches the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976) * desired contiuation hash. If it doesn't, return since
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) * there's no point to read in the successive index pages.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) bhash = dx_get_hash(p->at);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980) if (start_hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) *start_hash = bhash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982) if ((hash & 1) == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) if ((bhash & ~1) != hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987) * If the hash is HASH_NB_ALWAYS, we always go to the next
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) * block so no check is necessary
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) while (num_frames--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) return PTR_ERR(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) p++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) brelse(p->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) p->bh = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) * This function fills a red-black tree with information from a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) * directory block. It returns the number directory entries loaded
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006) * into the tree. If there is an error it is returned in err.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) static int htree_dirblock_to_tree(struct file *dir_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) struct inode *dir, ext4_lblk_t block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) struct dx_hash_info *hinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) __u32 start_hash, __u32 start_minor_hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) struct ext4_dir_entry_2 *de, *top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) int err = 0, count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) int csum = ext4_has_metadata_csum(dir->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) (unsigned long)block));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023) return PTR_ERR(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) de = (struct ext4_dir_entry_2 *) bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) /* csum entries are not larger in the casefolded encrypted case */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027) top = (struct ext4_dir_entry_2 *) ((char *) de +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) dir->i_sb->s_blocksize -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) ext4_dir_rec_len(0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) csum ? NULL : dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031) /* Check if the directory is encrypted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) if (IS_ENCRYPTED(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) err = fscrypt_prepare_readdir(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) err = fscrypt_fname_alloc_buffer(EXT4_NAME_LEN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) &fname_crypto_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) if (err < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) if (ext4_check_dir_entry(dir, NULL, de, bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) bh->b_data, bh->b_size, block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049) (block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) + ((char *)de - bh->b_data))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) /* silently ignore the rest of the block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) if (ext4_hash_in_dirent(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) if (de->name_len && de->inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) hinfo->hash = EXT4_DIRENT_HASH(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) hinfo->hash = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) hinfo->minor_hash = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1062) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1063) ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1064) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1065) if ((hinfo->hash < start_hash) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1066) ((hinfo->hash == start_hash) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1067) (hinfo->minor_hash < start_minor_hash)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1068) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1069) if (de->inode == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1070) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1071) if (!IS_ENCRYPTED(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1072) tmp_str.name = de->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1073) tmp_str.len = de->name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1074) err = ext4_htree_store_dirent(dir_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1075) hinfo->hash, hinfo->minor_hash, de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1076) &tmp_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1077) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1078) int save_len = fname_crypto_str.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1079) struct fscrypt_str de_name = FSTR_INIT(de->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1080) de->name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1081)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1082) /* Directory is encrypted */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1083) err = fscrypt_fname_disk_to_usr(dir, hinfo->hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1084) hinfo->minor_hash, &de_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1085) &fname_crypto_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1086) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1087) count = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1088) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1089) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1090) err = ext4_htree_store_dirent(dir_file,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1091) hinfo->hash, hinfo->minor_hash, de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1092) &fname_crypto_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1093) fname_crypto_str.len = save_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1094) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1095) if (err != 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1096) count = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1097) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1098) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1099) count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1101) errout:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1102) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1103) fscrypt_fname_free_buffer(&fname_crypto_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1104) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1105) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1106)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1108) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1109) * This function fills a red-black tree with information from a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1110) * directory. We start scanning the directory in hash order, starting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1111) * at start_hash and start_minor_hash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1112) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1113) * This function returns the number of entries inserted into the tree,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1114) * or a negative error code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1115) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1116) int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1117) __u32 start_minor_hash, __u32 *next_hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1119) struct dx_hash_info hinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1120) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1121) struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1122) struct inode *dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1123) ext4_lblk_t block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1124) int count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1125) int ret, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1126) __u32 hashval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1127) struct fscrypt_str tmp_str;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1129) dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1130) start_hash, start_minor_hash));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1131) dir = file_inode(dir_file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1132) if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1133) if (ext4_hash_in_dirent(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1134) hinfo.hash_version = DX_HASH_SIPHASH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1135) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1136) hinfo.hash_version =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1137) EXT4_SB(dir->i_sb)->s_def_hash_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1138) if (hinfo.hash_version <= DX_HASH_TEA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1139) hinfo.hash_version +=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1140) EXT4_SB(dir->i_sb)->s_hash_unsigned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1141) hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1142) if (ext4_has_inline_data(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1143) int has_inline_data = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1144) count = ext4_inlinedir_to_tree(dir_file, dir, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1145) &hinfo, start_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1146) start_minor_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1147) &has_inline_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1148) if (has_inline_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1149) *next_hash = ~0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1150) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1153) count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1154) start_hash, start_minor_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1155) *next_hash = ~0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1156) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1157) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1158) hinfo.hash = start_hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1159) hinfo.minor_hash = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1160) frame = dx_probe(NULL, dir, &hinfo, frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1161) if (IS_ERR(frame))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1162) return PTR_ERR(frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1164) /* Add '.' and '..' from the htree header */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1165) if (!start_hash && !start_minor_hash) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1166) de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1167) tmp_str.name = de->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1168) tmp_str.len = de->name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1169) err = ext4_htree_store_dirent(dir_file, 0, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1170) de, &tmp_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1171) if (err != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1172) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1173) count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1174) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1175) if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1176) de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1177) de = ext4_next_entry(de, dir->i_sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1178) tmp_str.name = de->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1179) tmp_str.len = de->name_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1180) err = ext4_htree_store_dirent(dir_file, 2, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1181) de, &tmp_str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1182) if (err != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1183) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1184) count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1185) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1186)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1187) while (1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1188) if (fatal_signal_pending(current)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1189) err = -ERESTARTSYS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1190) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1192) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1193) block = dx_get_block(frame->at);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1194) ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1195) start_hash, start_minor_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1196) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1197) err = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1198) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1199) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1200) count += ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1201) hashval = ~0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1202) ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1203) frame, frames, &hashval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1204) *next_hash = hashval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1205) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1206) err = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1207) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1208) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1209) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1210) * Stop if: (a) there are no more entries, or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1211) * (b) we have inserted at least one entry and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1212) * next hash value is not a continuation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1213) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1214) if ((ret == 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1215) (count && ((hashval & 1) == 0)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1216) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1217) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1218) dx_release(frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1219) dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1220) "next hash: %x\n", count, *next_hash));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1221) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1222) errout:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1223) dx_release(frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1224) return (err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1225) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1226)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1227) static inline int search_dirblock(struct buffer_head *bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1228) struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1229) struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1230) ext4_lblk_t lblk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1231) unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1232) struct ext4_dir_entry_2 **res_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1233) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1234) return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1235) fname, lblk, offset, res_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1236) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1238) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1239) * Directory block splitting, compacting
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1240) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1242) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1243) * Create map of hash values, offsets, and sizes, stored at end of block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1244) * Returns number of entries mapped.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1245) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1246) static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1247) unsigned blocksize, struct dx_hash_info *hinfo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1248) struct dx_map_entry *map_tail)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1249) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1250) int count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1251) char *base = (char *) de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1252) struct dx_hash_info h = *hinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1254) while ((char *) de < base + blocksize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1255) if (de->name_len && de->inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1256) if (ext4_hash_in_dirent(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1257) h.hash = EXT4_DIRENT_HASH(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1258) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1259) ext4fs_dirhash(dir, de->name, de->name_len, &h);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1260) map_tail--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1261) map_tail->hash = h.hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1262) map_tail->offs = ((char *) de - base)>>2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1263) map_tail->size = le16_to_cpu(de->rec_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1264) count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1265) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1267) /* XXX: do we need to check rec_len == 0 case? -Chris */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1268) de = ext4_next_entry(de, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1270) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1272)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1273) /* Sort map by hash value */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1274) static void dx_sort_map (struct dx_map_entry *map, unsigned count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1276) struct dx_map_entry *p, *q, *top = map + count - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1277) int more;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1278) /* Combsort until bubble sort doesn't suck */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1279) while (count > 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1280) count = count*10/13;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1281) if (count - 9 < 2) /* 9, 10 -> 11 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1282) count = 11;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1283) for (p = top, q = p - count; q >= map; p--, q--)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1284) if (p->hash < q->hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1285) swap(*p, *q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1286) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1287) /* Garden variety bubble sort */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1288) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1289) more = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1290) q = top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1291) while (q-- > map) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1292) if (q[1].hash >= q[0].hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1293) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1294) swap(*(q+1), *q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1295) more = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1297) } while(more);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1300) static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1301) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1302) struct dx_entry *entries = frame->entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1303) struct dx_entry *old = frame->at, *new = old + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1304) int count = dx_get_count(entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1306) assert(count < dx_get_limit(entries));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1307) assert(old < entries + count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1308) memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1309) dx_set_hash(new, hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1310) dx_set_block(new, block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1311) dx_set_count(entries, count + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1314) #ifdef CONFIG_UNICODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1315) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1316) * Test whether a case-insensitive directory entry matches the filename
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1317) * being searched for. If quick is set, assume the name being looked up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1318) * is already in the casefolded form.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1319) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1320) * Returns: 0 if the directory entry matches, more than 0 if it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1321) * doesn't match or less than zero on error.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1322) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1323) static int ext4_ci_compare(const struct inode *parent, const struct qstr *name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1324) u8 *de_name, size_t de_name_len, bool quick)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1326) const struct super_block *sb = parent->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1327) const struct unicode_map *um = sb->s_encoding;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1328) struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1329) struct qstr entry = QSTR_INIT(de_name, de_name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1330) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1332) if (IS_ENCRYPTED(parent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1333) const struct fscrypt_str encrypted_name =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1334) FSTR_INIT(de_name, de_name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1335)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1336) decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1337) if (!decrypted_name.name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1338) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1339) ret = fscrypt_fname_disk_to_usr(parent, 0, 0, &encrypted_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1340) &decrypted_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1341) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1342) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1343) entry.name = decrypted_name.name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1344) entry.len = decrypted_name.len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1346)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1347) if (quick)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1348) ret = utf8_strncasecmp_folded(um, name, &entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1349) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1350) ret = utf8_strncasecmp(um, name, &entry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1351) if (ret < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1352) /* Handle invalid character sequence as either an error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1353) * or as an opaque byte sequence.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1354) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1355) if (sb_has_strict_encoding(sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1356) ret = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1357) else if (name->len != entry.len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1358) ret = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1359) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1360) ret = !!memcmp(name->name, entry.name, entry.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1361) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1362) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1363) kfree(decrypted_name.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1364) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1367) int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1368) struct ext4_filename *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1369) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1370) struct fscrypt_str *cf_name = &name->cf_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1371) struct dx_hash_info *hinfo = &name->hinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1372) int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1373)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1374) if (!IS_CASEFOLDED(dir) || !dir->i_sb->s_encoding ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1375) (IS_ENCRYPTED(dir) && !fscrypt_has_encryption_key(dir))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1376) cf_name->name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1377) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1378) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1380) cf_name->name = kmalloc(EXT4_NAME_LEN, GFP_NOFS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1381) if (!cf_name->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1382) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1383)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1384) len = utf8_casefold(dir->i_sb->s_encoding,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1385) iname, cf_name->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1386) EXT4_NAME_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1387) if (len <= 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1388) kfree(cf_name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1389) cf_name->name = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1391) cf_name->len = (unsigned) len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1392) if (!IS_ENCRYPTED(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1393) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1394)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1395) hinfo->hash_version = DX_HASH_SIPHASH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1396) hinfo->seed = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1397) if (cf_name->name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1398) ext4fs_dirhash(dir, cf_name->name, cf_name->len, hinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1399) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1400) ext4fs_dirhash(dir, iname->name, iname->len, hinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1401) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1402) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1403) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1405) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1406) * Test whether a directory entry matches the filename being searched for.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1407) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1408) * Return: %true if the directory entry matches, otherwise %false.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1409) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1410) static bool ext4_match(struct inode *parent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1411) const struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1412) struct ext4_dir_entry_2 *de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1413) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1414) struct fscrypt_name f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1416) if (!de->inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1417) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1419) f.usr_fname = fname->usr_fname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1420) f.disk_name = fname->disk_name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1421) #ifdef CONFIG_FS_ENCRYPTION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1422) f.crypto_buf = fname->crypto_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1423) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1424)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1425) #ifdef CONFIG_UNICODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1426) if (parent->i_sb->s_encoding && IS_CASEFOLDED(parent) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1427) (!IS_ENCRYPTED(parent) || fscrypt_has_encryption_key(parent))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1428) if (fname->cf_name.name) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1429) struct qstr cf = {.name = fname->cf_name.name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1430) .len = fname->cf_name.len};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1431) if (IS_ENCRYPTED(parent)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1432) if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1433) fname->hinfo.minor_hash !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1434) EXT4_DIRENT_MINOR_HASH(de)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1435)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1436) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1438) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1439) return !ext4_ci_compare(parent, &cf, de->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1440) de->name_len, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1441) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1442) return !ext4_ci_compare(parent, fname->usr_fname, de->name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1443) de->name_len, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1444) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1445) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1446)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1447) return fscrypt_match_name(&f, de->name, de->name_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1450) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1451) * Returns 0 if not found, -1 on failure, and 1 on success
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1452) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1453) int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1454) struct inode *dir, struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1455) ext4_lblk_t lblk, unsigned int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1456) struct ext4_dir_entry_2 **res_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1457) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1458) struct ext4_dir_entry_2 * de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1459) char * dlimit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1460) int de_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1461)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1462) de = (struct ext4_dir_entry_2 *)search_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1463) dlimit = search_buf + buf_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1464) while ((char *) de < dlimit) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1465) /* this code is executed quadratically often */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1466) /* do minimal checking `by hand' */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1467) if ((char *) de + de->name_len <= dlimit &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1468) ext4_match(dir, fname, de)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1469) /* found a match - just to be sure, do
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1470) * a full check */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1471) if (ext4_check_dir_entry(dir, NULL, de, bh, search_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1472) buf_size, lblk, offset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1473) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1474) *res_dir = de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1475) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1477) /* prevent looping on a bad block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1478) de_len = ext4_rec_len_from_disk(de->rec_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1479) dir->i_sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1480) if (de_len <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1481) return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1482) offset += de_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1483) de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1485) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1486) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1487)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1488) static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1489) struct ext4_dir_entry *de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1490) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1491) struct super_block *sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1493) if (!is_dx(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1494) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1495) if (block == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1496) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1497) if (de->inode == 0 &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1498) ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) ==
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1499) sb->s_blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1500) return 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1501) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1502) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1504) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1505) * __ext4_find_entry()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1506) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1507) * finds an entry in the specified directory with the wanted name. It
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1508) * returns the cache buffer in which the entry was found, and the entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1509) * itself (as a parameter - res_dir). It does NOT read the inode of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1510) * entry - you'll have to do that yourself if you want to.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1511) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1512) * The returned buffer_head has ->b_count elevated. The caller is expected
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1513) * to brelse() it when appropriate.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1514) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1515) static struct buffer_head *__ext4_find_entry(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1516) struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1517) struct ext4_dir_entry_2 **res_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1518) int *inlined, ext4_lblk_t *lblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1519) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1520) struct super_block *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1521) struct buffer_head *bh_use[NAMEI_RA_SIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1522) struct buffer_head *bh, *ret = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1523) ext4_lblk_t start, block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1524) const u8 *name = fname->usr_fname->name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1525) size_t ra_max = 0; /* Number of bh's in the readahead
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1526) buffer, bh_use[] */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1527) size_t ra_ptr = 0; /* Current index into readahead
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1528) buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1529) ext4_lblk_t nblocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1530) int i, namelen, retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1531)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1532) *res_dir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1533) sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1534) namelen = fname->usr_fname->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1535) if (namelen > EXT4_NAME_LEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1536) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1537)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1538) if (ext4_has_inline_data(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1539) int has_inline_data = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1540) ret = ext4_find_inline_entry(dir, fname, res_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1541) &has_inline_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1542) if (lblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1543) *lblk = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1544) if (has_inline_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1545) if (inlined)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1546) *inlined = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1547) goto cleanup_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1551) if ((namelen <= 2) && (name[0] == '.') &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1552) (name[1] == '.' || name[1] == '\0')) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1553) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1554) * "." or ".." will only be in the first block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1555) * NFS may look up ".."; "." should be handled by the VFS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1556) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1557) block = start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1558) nblocks = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1559) goto restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1560) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1561) if (is_dx(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1562) ret = ext4_dx_find_entry(dir, fname, res_dir, lblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1563) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1564) * On success, or if the error was file not found,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1565) * return. Otherwise, fall back to doing a search the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1566) * old fashioned way.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1567) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1568) if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1569) goto cleanup_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1570) dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1571) "falling back\n"));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1572) ret = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1573) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1574) nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1575) if (!nblocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1576) ret = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1577) goto cleanup_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1578) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1579) start = EXT4_I(dir)->i_dir_start_lookup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1580) if (start >= nblocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1581) start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1582) block = start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1583) restart:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1584) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1585) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1586) * We deal with the read-ahead logic here.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1587) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1588) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1589) if (ra_ptr >= ra_max) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1590) /* Refill the readahead buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1591) ra_ptr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1592) if (block < start)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1593) ra_max = start - block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1594) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1595) ra_max = nblocks - block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1596) ra_max = min(ra_max, ARRAY_SIZE(bh_use));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1597) retval = ext4_bread_batch(dir, block, ra_max,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1598) false /* wait */, bh_use);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1599) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1600) ret = ERR_PTR(retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1601) ra_max = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1602) goto cleanup_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1603) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1605) if ((bh = bh_use[ra_ptr++]) == NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1606) goto next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1607) wait_on_buffer(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1608) if (!buffer_uptodate(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1609) EXT4_ERROR_INODE_ERR(dir, EIO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1610) "reading directory lblock %lu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1611) (unsigned long) block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1612) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1613) ret = ERR_PTR(-EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1614) goto cleanup_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1615) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1616) if (!buffer_verified(bh) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1617) !is_dx_internal_node(dir, block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1618) (struct ext4_dir_entry *)bh->b_data) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1619) !ext4_dirblock_csum_verify(dir, bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1620) EXT4_ERROR_INODE_ERR(dir, EFSBADCRC,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1621) "checksumming directory "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1622) "block %lu", (unsigned long)block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1623) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1624) ret = ERR_PTR(-EFSBADCRC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1625) goto cleanup_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1626) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1627) set_buffer_verified(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1628) i = search_dirblock(bh, dir, fname, block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1629) block << EXT4_BLOCK_SIZE_BITS(sb), res_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1630) if (i == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1631) if (lblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1632) *lblk = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1633) EXT4_I(dir)->i_dir_start_lookup = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1634) ret = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1635) goto cleanup_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1636) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1637) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1638) if (i < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1639) goto cleanup_and_exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1640) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1641) next:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1642) if (++block >= nblocks)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1643) block = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1644) } while (block != start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1645)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1646) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1647) * If the directory has grown while we were searching, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1648) * search the last part of the directory before giving up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1649) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1650) block = nblocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1651) nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1652) if (block < nblocks) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1653) start = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1654) goto restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1655) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1656)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1657) cleanup_and_exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1658) /* Clean up the read-ahead blocks */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1659) for (; ra_ptr < ra_max; ra_ptr++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1660) brelse(bh_use[ra_ptr]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1661) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1662) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1663)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1664) static struct buffer_head *ext4_find_entry(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1665) const struct qstr *d_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1666) struct ext4_dir_entry_2 **res_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1667) int *inlined, ext4_lblk_t *lblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1668) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1669) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1670) struct ext4_filename fname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1671) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1673) err = ext4_fname_setup_filename(dir, d_name, 1, &fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1674) if (err == -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1675) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1676) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1677) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1679) bh = __ext4_find_entry(dir, &fname, res_dir, inlined, lblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1680)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1681) ext4_fname_free_filename(&fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1682) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1683) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1684)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1685) static struct buffer_head *ext4_lookup_entry(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1686) struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1687) struct ext4_dir_entry_2 **res_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1688) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1689) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1690) struct ext4_filename fname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1691) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1692)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1693) err = ext4_fname_prepare_lookup(dir, dentry, &fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1694) generic_set_encrypted_ci_d_ops(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1695) if (err == -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1696) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1697) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1698) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1699)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1700) bh = __ext4_find_entry(dir, &fname, res_dir, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1702) ext4_fname_free_filename(&fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1703) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1704) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1705)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1706) static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1707) struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1708) struct ext4_dir_entry_2 **res_dir, ext4_lblk_t *lblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1709) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1710) struct super_block * sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1711) struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1712) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1713) ext4_lblk_t block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1714) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1715)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1716) #ifdef CONFIG_FS_ENCRYPTION
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1717) *res_dir = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1718) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1719) frame = dx_probe(fname, dir, NULL, frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1720) if (IS_ERR(frame))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1721) return (struct buffer_head *) frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1722) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1723) block = dx_get_block(frame->at);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1724) if (lblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1725) *lblk = block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1726) bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1727) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1728) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1729)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1730) retval = search_dirblock(bh, dir, fname, block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1731) block << EXT4_BLOCK_SIZE_BITS(sb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1732) res_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1733) if (retval == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1734) goto success;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1735) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1736) if (retval == -1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1737) bh = ERR_PTR(ERR_BAD_DX_DIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1738) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1741) /* Check to see if we should continue to search */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1742) retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1743) frames, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1744) if (retval < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1745) ext4_warning_inode(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1746) "error %d reading directory index block",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1747) retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1748) bh = ERR_PTR(retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1749) goto errout;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1750) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1751) } while (retval == 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1752)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1753) bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1754) errout:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1755) dxtrace(printk(KERN_DEBUG "%s not found\n", fname->usr_fname->name));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1756) success:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1757) dx_release(frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1758) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1759) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1761) static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1762) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1763) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1764) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1765) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1766)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1767) if (dentry->d_name.len > EXT4_NAME_LEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1768) return ERR_PTR(-ENAMETOOLONG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1770) bh = ext4_lookup_entry(dir, dentry, &de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1771) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1772) return ERR_CAST(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1773) inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1774) if (bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1775) __u32 ino = le32_to_cpu(de->inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1776) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1777) if (!ext4_valid_inum(dir->i_sb, ino)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1778) EXT4_ERROR_INODE(dir, "bad inode number: %u", ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1779) return ERR_PTR(-EFSCORRUPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1780) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1781) if (unlikely(ino == dir->i_ino)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1782) EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1783) dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1784) return ERR_PTR(-EFSCORRUPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1785) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1786) inode = ext4_iget(dir->i_sb, ino, EXT4_IGET_NORMAL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1787) if (inode == ERR_PTR(-ESTALE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1788) EXT4_ERROR_INODE(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1789) "deleted inode referenced: %u",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1790) ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1791) return ERR_PTR(-EFSCORRUPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1792) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1793) if (!IS_ERR(inode) && IS_ENCRYPTED(dir) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1794) (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1795) !fscrypt_has_permitted_context(dir, inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1796) ext4_warning(inode->i_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1797) "Inconsistent encryption contexts: %lu/%lu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1798) dir->i_ino, inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1799) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1800) return ERR_PTR(-EPERM);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1801) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1802) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1803)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1804) #ifdef CONFIG_UNICODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1805) if (!inode && IS_CASEFOLDED(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1806) /* Eventually we want to call d_add_ci(dentry, NULL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1807) * for negative dentries in the encoding case as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1808) * well. For now, prevent the negative dentry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1809) * from being cached.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1810) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1811) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1812) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1813) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1814) return d_splice_alias(inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1815) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1817)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1818) struct dentry *ext4_get_parent(struct dentry *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1819) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1820) __u32 ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1821) static const struct qstr dotdot = QSTR_INIT("..", 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1822) struct ext4_dir_entry_2 * de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1823) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1824)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1825) bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1826) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1827) return ERR_CAST(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1828) if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1829) return ERR_PTR(-ENOENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1830) ino = le32_to_cpu(de->inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1831) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1832)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1833) if (!ext4_valid_inum(child->d_sb, ino)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1834) EXT4_ERROR_INODE(d_inode(child),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1835) "bad parent inode number: %u", ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1836) return ERR_PTR(-EFSCORRUPTED);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1837) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1839) return d_obtain_alias(ext4_iget(child->d_sb, ino, EXT4_IGET_NORMAL));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1840) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1841)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1842) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1843) * Move count entries from end of map between two memory locations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1844) * Returns pointer to last entry moved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1845) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1846) static struct ext4_dir_entry_2 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1847) dx_move_dirents(struct inode *dir, char *from, char *to,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1848) struct dx_map_entry *map, int count,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1849) unsigned blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1850) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1851) unsigned rec_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1852)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1853) while (count--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1854) struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1855) (from + (map->offs<<2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1856) rec_len = ext4_dir_rec_len(de->name_len, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1857)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1858) memcpy (to, de, rec_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1859) ((struct ext4_dir_entry_2 *) to)->rec_len =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1860) ext4_rec_len_to_disk(rec_len, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1861) de->inode = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1862) map++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1863) to += rec_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1864) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1865) return (struct ext4_dir_entry_2 *) (to - rec_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1866) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1868) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1869) * Compact each dir entry in the range to the minimal rec_len.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1870) * Returns pointer to last entry in range.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1871) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1872) static struct ext4_dir_entry_2 *dx_pack_dirents(struct inode *dir, char *base,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1873) unsigned int blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1874) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1875) struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1876) unsigned rec_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1877)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1878) prev = to = de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1879) while ((char*)de < base + blocksize) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1880) next = ext4_next_entry(de, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1881) if (de->inode && de->name_len) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1882) rec_len = ext4_dir_rec_len(de->name_len, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1883) if (de > to)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1884) memmove(to, de, rec_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1885) to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1886) prev = to;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1887) to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1888) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1889) de = next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1890) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1891) return prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1892) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1894) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1895) * Split a full leaf block to make room for a new dir entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1896) * Allocate a new block, and move entries so that they are approx. equally full.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1897) * Returns pointer to de in block into which the new entry will be inserted.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1898) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1899) static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1900) struct buffer_head **bh, struct dx_frame *frame,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1901) struct dx_hash_info *hinfo, ext4_lblk_t *newblock)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1902) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1903) unsigned blocksize = dir->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1904) unsigned count, continued;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1905) struct buffer_head *bh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1906) u32 hash2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1907) struct dx_map_entry *map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1908) char *data1 = (*bh)->b_data, *data2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1909) unsigned split, move, size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1910) struct ext4_dir_entry_2 *de = NULL, *de2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1911) int csum_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1912) int err = 0, i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1913)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1914) if (ext4_has_metadata_csum(dir->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1915) csum_size = sizeof(struct ext4_dir_entry_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1916)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1917) bh2 = ext4_append(handle, dir, newblock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1918) if (IS_ERR(bh2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1919) brelse(*bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1920) *bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1921) return (struct ext4_dir_entry_2 *) bh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1922) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1924) BUFFER_TRACE(*bh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1925) err = ext4_journal_get_write_access(handle, *bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1926) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1927) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1928)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1929) BUFFER_TRACE(frame->bh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1930) err = ext4_journal_get_write_access(handle, frame->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1931) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1932) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1934) data2 = bh2->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1935)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1936) /* create map in the end of data2 block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1937) map = (struct dx_map_entry *) (data2 + blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1938) count = dx_make_map(dir, (struct ext4_dir_entry_2 *) data1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1939) blocksize, hinfo, map);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1940) map -= count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1941) dx_sort_map(map, count);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1942) /* Ensure that neither split block is over half full */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1943) size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1944) move = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1945) for (i = count-1; i >= 0; i--) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1946) /* is more than half of this entry in 2nd half of the block? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1947) if (size + map[i].size/2 > blocksize/2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1948) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1949) size += map[i].size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1950) move++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1951) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1952) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1953) * map index at which we will split
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1954) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1955) * If the sum of active entries didn't exceed half the block size, just
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1956) * split it in half by count; each resulting block will have at least
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1957) * half the space free.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1958) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1959) if (i > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1960) split = count - move;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1961) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1962) split = count/2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1964) hash2 = map[split].hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1965) continued = hash2 == map[split - 1].hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1966) dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1967) (unsigned long)dx_get_block(frame->at),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1968) hash2, split, count-split));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1969)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1970) /* Fancy dance to stay within two buffers */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1971) de2 = dx_move_dirents(dir, data1, data2, map + split, count - split,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1972) blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1973) de = dx_pack_dirents(dir, data1, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1974) de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1975) (char *) de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1976) blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1977) de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1978) (char *) de2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1979) blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1980) if (csum_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1981) ext4_initialize_dirent_tail(*bh, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1982) ext4_initialize_dirent_tail(bh2, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1983) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1984)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1985) dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1986) blocksize, 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1987) dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1988) blocksize, 1));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1989)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1990) /* Which block gets the new entry? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1991) if (hinfo->hash >= hash2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1992) swap(*bh, bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1993) de = de2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1994) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1995) dx_insert_block(frame, hash2 + continued, *newblock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1996) err = ext4_handle_dirty_dirblock(handle, dir, bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1997) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1998) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1999) err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2000) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2001) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2002) brelse(bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2003) dxtrace(dx_show_index("frame", frame->entries));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2004) return de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2005)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2006) journal_error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2007) brelse(*bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2008) brelse(bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2009) *bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2010) ext4_std_error(dir->i_sb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2011) return ERR_PTR(err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2012) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2013)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2014) int ext4_find_dest_de(struct inode *dir, struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2015) ext4_lblk_t lblk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2016) struct buffer_head *bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2017) void *buf, int buf_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2018) struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2019) struct ext4_dir_entry_2 **dest_de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2020) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2021) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2022) unsigned short reclen = ext4_dir_rec_len(fname_len(fname), dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2023) int nlen, rlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2024) unsigned int offset = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2025) char *top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2026)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2027) de = (struct ext4_dir_entry_2 *)buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2028) top = buf + buf_size - reclen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2029) while ((char *) de <= top) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2030) if (ext4_check_dir_entry(dir, NULL, de, bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2031) buf, buf_size, lblk, offset))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2032) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2033) if (ext4_match(dir, fname, de))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2034) return -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2035) nlen = ext4_dir_rec_len(de->name_len, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2036) rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2037) if ((de->inode ? rlen - nlen : rlen) >= reclen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2038) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2039) de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2040) offset += rlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2041) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2042) if ((char *) de > top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2043) return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2044)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2045) *dest_de = de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2046) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2047) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2048)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2049) void ext4_insert_dentry(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2050) struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2051) struct ext4_dir_entry_2 *de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2052) int buf_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2053) struct ext4_filename *fname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2054) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2055)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2056) int nlen, rlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2057)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2058) nlen = ext4_dir_rec_len(de->name_len, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2059) rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2060) if (de->inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2061) struct ext4_dir_entry_2 *de1 =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2062) (struct ext4_dir_entry_2 *)((char *)de + nlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2063) de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2064) de->rec_len = ext4_rec_len_to_disk(nlen, buf_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2065) de = de1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2066) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2067) de->file_type = EXT4_FT_UNKNOWN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2068) de->inode = cpu_to_le32(inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2069) ext4_set_de_type(inode->i_sb, de, inode->i_mode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2070) de->name_len = fname_len(fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2071) memcpy(de->name, fname_name(fname), fname_len(fname));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2072) if (ext4_hash_in_dirent(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2073) struct dx_hash_info *hinfo = &fname->hinfo;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2074)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2075) EXT4_DIRENT_HASHES(de)->hash = cpu_to_le32(hinfo->hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2076) EXT4_DIRENT_HASHES(de)->minor_hash =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2077) cpu_to_le32(hinfo->minor_hash);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2078) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2079) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2080)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2081) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2082) * Add a new entry into a directory (leaf) block. If de is non-NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2083) * it points to a directory entry which is guaranteed to be large
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2084) * enough for new directory entry. If de is NULL, then
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2085) * add_dirent_to_buf will attempt search the directory block for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2086) * space. It will return -ENOSPC if no space is available, and -EIO
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2087) * and -EEXIST if directory entry already exists.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2088) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2089) static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2090) struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2091) struct inode *inode, struct ext4_dir_entry_2 *de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2092) ext4_lblk_t blk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2093) struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2094) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2095) unsigned int blocksize = dir->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2096) int csum_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2097) int err, err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2098)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2099) if (ext4_has_metadata_csum(inode->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2100) csum_size = sizeof(struct ext4_dir_entry_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2101)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2102) if (!de) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2103) err = ext4_find_dest_de(dir, inode, blk, bh, bh->b_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2104) blocksize - csum_size, fname, &de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2105) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2106) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2108) BUFFER_TRACE(bh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2109) err = ext4_journal_get_write_access(handle, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2110) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2111) ext4_std_error(dir->i_sb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2112) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2115) /* By now the buffer is marked for journaling */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2116) ext4_insert_dentry(dir, inode, de, blocksize, fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2118) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2119) * XXX shouldn't update any times until successful
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2120) * completion of syscall, but too many callers depend
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2121) * on this.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2122) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2123) * XXX similarly, too many callers depend on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2124) * ext4_new_inode() setting the times, but error
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2125) * recovery deletes the inode, so the worst that can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2126) * happen is that the times are slightly out of date
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2127) * and/or different from the directory change time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2128) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2129) dir->i_mtime = dir->i_ctime = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2130) ext4_update_dx_flag(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2131) inode_inc_iversion(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2132) err2 = ext4_mark_inode_dirty(handle, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2133) BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2134) err = ext4_handle_dirty_dirblock(handle, dir, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2135) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2136) ext4_std_error(dir->i_sb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2137) return err ? err : err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2138) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2140) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2141) * This converts a one block unindexed directory to a 3 block indexed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2142) * directory, and adds the dentry to the indexed directory.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2143) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2144) static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2145) struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2146) struct inode *inode, struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2148) struct buffer_head *bh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2149) struct dx_root *root;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2150) struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2151) struct dx_entry *entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2152) struct ext4_dir_entry_2 *de, *de2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2153) char *data2, *top;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2154) unsigned len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2155) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2156) unsigned blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2157) ext4_lblk_t block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2158) struct fake_dirent *fde;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2159) int csum_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2161) if (ext4_has_metadata_csum(inode->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2162) csum_size = sizeof(struct ext4_dir_entry_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2163)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2164) blocksize = dir->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2165) dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2166) BUFFER_TRACE(bh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2167) retval = ext4_journal_get_write_access(handle, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2168) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2169) ext4_std_error(dir->i_sb, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2170) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2171) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2173) root = (struct dx_root *) bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2175) /* The 0th block becomes the root, move the dirents out */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2176) fde = &root->dotdot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2177) de = (struct ext4_dir_entry_2 *)((char *)fde +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2178) ext4_rec_len_from_disk(fde->rec_len, blocksize));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2179) if ((char *) de >= (((char *) root) + blocksize)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2180) EXT4_ERROR_INODE(dir, "invalid rec_len for '..'");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2181) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2182) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2184) len = ((char *) root) + (blocksize - csum_size) - (char *) de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2186) /* Allocate new block for the 0th block's dirents */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2187) bh2 = ext4_append(handle, dir, &block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2188) if (IS_ERR(bh2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2189) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2190) return PTR_ERR(bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2192) ext4_set_inode_flag(dir, EXT4_INODE_INDEX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2193) data2 = bh2->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2194)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2195) memcpy(data2, de, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2196) de = (struct ext4_dir_entry_2 *) data2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2197) top = data2 + len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2198) while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2199) de = de2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2200) de->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2201) (char *) de, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2203) if (csum_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2204) ext4_initialize_dirent_tail(bh2, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2205)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2206) /* Initialize the root; the dot dirents already exist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2207) de = (struct ext4_dir_entry_2 *) (&root->dotdot);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2208) de->rec_len = ext4_rec_len_to_disk(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2209) blocksize - ext4_dir_rec_len(2, NULL), blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2210) memset (&root->info, 0, sizeof(root->info));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2211) root->info.info_length = sizeof(root->info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2212) if (ext4_hash_in_dirent(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2213) root->info.hash_version = DX_HASH_SIPHASH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2214) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2215) root->info.hash_version =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2216) EXT4_SB(dir->i_sb)->s_def_hash_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2218) entries = root->entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2219) dx_set_block(entries, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2220) dx_set_count(entries, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2221) dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2223) /* Initialize as for dx_probe */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2224) fname->hinfo.hash_version = root->info.hash_version;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2225) if (fname->hinfo.hash_version <= DX_HASH_TEA)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2226) fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2227) fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2228)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2229) /* casefolded encrypted hashes are computed on fname setup */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2230) if (!ext4_hash_in_dirent(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2231) ext4fs_dirhash(dir, fname_name(fname),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2232) fname_len(fname), &fname->hinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2233)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2234) memset(frames, 0, sizeof(frames));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2235) frame = frames;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2236) frame->entries = entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2237) frame->at = entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2238) frame->bh = bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2240) retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2241) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2242) goto out_frames;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2243) retval = ext4_handle_dirty_dirblock(handle, dir, bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2244) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2245) goto out_frames;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2246)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2247) de = do_split(handle, dir, &bh2, frame, &fname->hinfo, &block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2248) if (IS_ERR(de)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2249) retval = PTR_ERR(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2250) goto out_frames;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2251) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2252)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2253) retval = add_dirent_to_buf(handle, fname, dir, inode, de, block, bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2254) out_frames:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2255) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2256) * Even if the block split failed, we have to properly write
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2257) * out all the changes we did so far. Otherwise we can end up
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2258) * with corrupted filesystem.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2259) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2260) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2261) ext4_mark_inode_dirty(handle, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2262) dx_release(frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2263) brelse(bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2264) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2266)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2267) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2268) * ext4_add_entry()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2269) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2270) * adds a file entry to the specified directory, using the same
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2271) * semantics as ext4_find_entry(). It returns NULL if it failed.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2272) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2273) * NOTE!! The inode part of 'de' is left at 0 - which means you
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2274) * may not sleep between calling this and putting something into
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2275) * the entry, as someone else might have used it while you slept.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2276) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2277) static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2278) struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2279) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2280) struct inode *dir = d_inode(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2281) struct buffer_head *bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2282) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2283) struct super_block *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2284) struct ext4_filename fname;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2285) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2286) int dx_fallback=0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2287) unsigned blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2288) ext4_lblk_t block, blocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2289) int csum_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2290)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2291) if (ext4_has_metadata_csum(inode->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2292) csum_size = sizeof(struct ext4_dir_entry_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2294) sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2295) blocksize = sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2296) if (!dentry->d_name.len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2297) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2299) if (fscrypt_is_nokey_name(dentry))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2300) return -ENOKEY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2301)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2302) #ifdef CONFIG_UNICODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2303) if (sb_has_strict_encoding(sb) && IS_CASEFOLDED(dir) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2304) sb->s_encoding && utf8_validate(sb->s_encoding, &dentry->d_name))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2305) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2306) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2308) retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2309) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2310) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2311)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2312) if (ext4_has_inline_data(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2313) retval = ext4_try_add_inline_entry(handle, &fname, dir, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2314) if (retval < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2315) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2316) if (retval == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2317) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2318) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2321)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2322) if (is_dx(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2323) retval = ext4_dx_add_entry(handle, &fname, dir, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2324) if (!retval || (retval != ERR_BAD_DX_DIR))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2325) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2326) /* Can we just ignore htree data? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2327) if (ext4_has_metadata_csum(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2328) EXT4_ERROR_INODE(dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2329) "Directory has corrupted htree index.");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2330) retval = -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2331) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2332) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2333) ext4_clear_inode_flag(dir, EXT4_INODE_INDEX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2334) dx_fallback++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2335) retval = ext4_mark_inode_dirty(handle, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2336) if (unlikely(retval))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2337) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2338) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2339) blocks = dir->i_size >> sb->s_blocksize_bits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2340) for (block = 0; block < blocks; block++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2341) bh = ext4_read_dirblock(dir, block, DIRENT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2342) if (bh == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2343) bh = ext4_bread(handle, dir, block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2344) EXT4_GET_BLOCKS_CREATE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2345) goto add_to_new_block;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2346) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2347) if (IS_ERR(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2348) retval = PTR_ERR(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2349) bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2350) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2351) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2352) retval = add_dirent_to_buf(handle, &fname, dir, inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2353) NULL, block, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2354) if (retval != -ENOSPC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2355) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2356)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2357) if (blocks == 1 && !dx_fallback &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2358) ext4_has_feature_dir_index(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2359) retval = make_indexed_dir(handle, &fname, dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2360) inode, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2361) bh = NULL; /* make_indexed_dir releases bh */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2362) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2363) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2364) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2366) bh = ext4_append(handle, dir, &block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2367) add_to_new_block:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2368) if (IS_ERR(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2369) retval = PTR_ERR(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2370) bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2371) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2372) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2373) de = (struct ext4_dir_entry_2 *) bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2374) de->inode = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2375) de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2377) if (csum_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2378) ext4_initialize_dirent_tail(bh, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2379)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2380) retval = add_dirent_to_buf(handle, &fname, dir, inode, de, block, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2381) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2382) ext4_fname_free_filename(&fname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2383) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2384) if (retval == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2385) ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2386) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2387) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2388)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2389) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2390) * Returns 0 for success, or a negative error value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2391) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2392) static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2393) struct inode *dir, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2394) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2395) struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2396) struct dx_entry *entries, *at;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2397) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2398) struct super_block *sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2399) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2400) int restart;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2401) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2402) ext4_lblk_t lblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2403)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2404) again:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2405) restart = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2406) frame = dx_probe(fname, dir, NULL, frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2407) if (IS_ERR(frame))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2408) return PTR_ERR(frame);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2409) entries = frame->entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2410) at = frame->at;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2411) lblk = dx_get_block(frame->at);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2412) bh = ext4_read_dirblock(dir, lblk, DIRENT_HTREE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2413) if (IS_ERR(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2414) err = PTR_ERR(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2415) bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2416) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2417) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2419) BUFFER_TRACE(bh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2420) err = ext4_journal_get_write_access(handle, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2421) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2422) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2424) err = add_dirent_to_buf(handle, fname, dir, inode, NULL, lblk, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2425) if (err != -ENOSPC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2426) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2428) err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2429) /* Block full, should compress but for now just split */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2430) dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2431) dx_get_count(entries), dx_get_limit(entries)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2432) /* Need to split index? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2433) if (dx_get_count(entries) == dx_get_limit(entries)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2434) ext4_lblk_t newblock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2435) int levels = frame - frames + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2436) unsigned int icount;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2437) int add_level = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2438) struct dx_entry *entries2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2439) struct dx_node *node2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2440) struct buffer_head *bh2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2441)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2442) while (frame > frames) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2443) if (dx_get_count((frame - 1)->entries) <
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2444) dx_get_limit((frame - 1)->entries)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2445) add_level = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2446) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2447) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2448) frame--; /* split higher index block */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2449) at = frame->at;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2450) entries = frame->entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2451) restart = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2452) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2453) if (add_level && levels == ext4_dir_htree_level(sb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2454) ext4_warning(sb, "Directory (ino: %lu) index full, "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2455) "reach max htree level :%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2456) dir->i_ino, levels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2457) if (ext4_dir_htree_level(sb) < EXT4_HTREE_LEVEL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2458) ext4_warning(sb, "Large directory feature is "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2459) "not enabled on this "
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2460) "filesystem");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2461) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2462) err = -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2463) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2464) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2465) icount = dx_get_count(entries);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2466) bh2 = ext4_append(handle, dir, &newblock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2467) if (IS_ERR(bh2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2468) err = PTR_ERR(bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2469) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2470) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2471) node2 = (struct dx_node *)(bh2->b_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2472) entries2 = node2->entries;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2473) memset(&node2->fake, 0, sizeof(struct fake_dirent));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2474) node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2475) sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2476) BUFFER_TRACE(frame->bh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2477) err = ext4_journal_get_write_access(handle, frame->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2478) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2479) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2480) if (!add_level) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2481) unsigned icount1 = icount/2, icount2 = icount - icount1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2482) unsigned hash2 = dx_get_hash(entries + icount1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2483) dxtrace(printk(KERN_DEBUG "Split index %i/%i\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2484) icount1, icount2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2486) BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2487) err = ext4_journal_get_write_access(handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2488) (frame - 1)->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2489) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2490) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2491)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2492) memcpy((char *) entries2, (char *) (entries + icount1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2493) icount2 * sizeof(struct dx_entry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2494) dx_set_count(entries, icount1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2495) dx_set_count(entries2, icount2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2496) dx_set_limit(entries2, dx_node_limit(dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2497)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2498) /* Which index block gets the new entry? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2499) if (at - entries >= icount1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2500) frame->at = at = at - entries - icount1 + entries2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2501) frame->entries = entries = entries2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2502) swap(frame->bh, bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2504) dx_insert_block((frame - 1), hash2, newblock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2505) dxtrace(dx_show_index("node", frame->entries));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2506) dxtrace(dx_show_index("node",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2507) ((struct dx_node *) bh2->b_data)->entries));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2508) err = ext4_handle_dirty_dx_node(handle, dir, bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2509) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2510) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2511) brelse (bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2512) err = ext4_handle_dirty_dx_node(handle, dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2513) (frame - 1)->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2514) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2515) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2516) err = ext4_handle_dirty_dx_node(handle, dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2517) frame->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2518) if (restart || err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2519) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2520) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2521) struct dx_root *dxroot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2522) memcpy((char *) entries2, (char *) entries,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2523) icount * sizeof(struct dx_entry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2524) dx_set_limit(entries2, dx_node_limit(dir));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2525)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2526) /* Set up root */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2527) dx_set_count(entries, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2528) dx_set_block(entries + 0, newblock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2529) dxroot = (struct dx_root *)frames[0].bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2530) dxroot->info.indirect_levels += 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2531) dxtrace(printk(KERN_DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2532) "Creating %d level index...\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2533) dxroot->info.indirect_levels));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2534) err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2535) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2536) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2537) err = ext4_handle_dirty_dx_node(handle, dir, bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2538) brelse(bh2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2539) restart = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2540) goto journal_error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2541) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2542) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2543) de = do_split(handle, dir, &bh, frame, &fname->hinfo, &lblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2544) if (IS_ERR(de)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2545) err = PTR_ERR(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2546) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2547) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2548) err = add_dirent_to_buf(handle, fname, dir, inode, de, lblk, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2549) goto cleanup;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2551) journal_error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2552) ext4_std_error(dir->i_sb, err); /* this is a no-op if err == 0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2553) cleanup:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2554) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2555) dx_release(frames);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2556) /* @restart is true means htree-path has been changed, we need to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2557) * repeat dx_probe() to find out valid htree-path
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2558) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2559) if (restart && err == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2560) goto again;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2561) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2562) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2563)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2564) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2565) * ext4_generic_delete_entry deletes a directory entry by merging it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2566) * with the previous entry
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2567) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2568) int ext4_generic_delete_entry(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2569) struct ext4_dir_entry_2 *de_del,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2570) ext4_lblk_t lblk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2571) struct buffer_head *bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2572) void *entry_buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2573) int buf_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2574) int csum_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2575) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2576) struct ext4_dir_entry_2 *de, *pde;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2577) unsigned int blocksize = dir->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2578) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2579)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2580) i = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2581) pde = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2582) de = (struct ext4_dir_entry_2 *)entry_buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2583) while (i < buf_size - csum_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2584) if (ext4_check_dir_entry(dir, NULL, de, bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2585) entry_buf, buf_size, lblk, i))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2586) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2587) if (de == de_del) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2588) if (pde)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2589) pde->rec_len = ext4_rec_len_to_disk(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2590) ext4_rec_len_from_disk(pde->rec_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2591) blocksize) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2592) ext4_rec_len_from_disk(de->rec_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2593) blocksize),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2594) blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2595) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2596) de->inode = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2597) inode_inc_iversion(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2598) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2599) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2600) i += ext4_rec_len_from_disk(de->rec_len, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2601) pde = de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2602) de = ext4_next_entry(de, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2603) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2604) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2605) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2606)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2607) static int ext4_delete_entry(handle_t *handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2608) struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2609) struct ext4_dir_entry_2 *de_del,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2610) ext4_lblk_t lblk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2611) struct buffer_head *bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2612) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2613) int err, csum_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2614)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2615) if (ext4_has_inline_data(dir)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2616) int has_inline_data = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2617) err = ext4_delete_inline_entry(handle, dir, de_del, bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2618) &has_inline_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2619) if (has_inline_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2620) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2621) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2622)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2623) if (ext4_has_metadata_csum(dir->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2624) csum_size = sizeof(struct ext4_dir_entry_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2626) BUFFER_TRACE(bh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2627) err = ext4_journal_get_write_access(handle, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2628) if (unlikely(err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2629) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2631) err = ext4_generic_delete_entry(dir, de_del, lblk, bh, bh->b_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2632) dir->i_sb->s_blocksize, csum_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2633) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2634) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2636) BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2637) err = ext4_handle_dirty_dirblock(handle, dir, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2638) if (unlikely(err))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2639) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2640)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2641) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2642) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2643) if (err != -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2644) ext4_std_error(dir->i_sb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2645) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2646) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2648) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2649) * Set directory link count to 1 if nlinks > EXT4_LINK_MAX, or if nlinks == 2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2650) * since this indicates that nlinks count was previously 1 to avoid overflowing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2651) * the 16-bit i_links_count field on disk. Directories with i_nlink == 1 mean
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2652) * that subdirectory link counts are not being maintained accurately.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2653) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2654) * The caller has already checked for i_nlink overflow in case the DIR_LINK
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2655) * feature is not enabled and returned -EMLINK. The is_dx() check is a proxy
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2656) * for checking S_ISDIR(inode) (since the INODE_INDEX feature will not be set
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2657) * on regular files) and to avoid creating huge/slow non-HTREE directories.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2658) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2659) static void ext4_inc_count(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2660) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2661) inc_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2662) if (is_dx(inode) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2663) (inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2664) set_nlink(inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2665) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2667) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2668) * If a directory had nlink == 1, then we should let it be 1. This indicates
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2669) * directory has >EXT4_LINK_MAX subdirs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2670) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2671) static void ext4_dec_count(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2672) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2673) if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2674) drop_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2675) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2676)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2677)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2678) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2679) * Add non-directory inode to a directory. On success, the inode reference is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2680) * consumed by dentry is instantiation. This is also indicated by clearing of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2681) * *inodep pointer. On failure, the caller is responsible for dropping the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2682) * inode reference in the safe context.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2683) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2684) static int ext4_add_nondir(handle_t *handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2685) struct dentry *dentry, struct inode **inodep)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2686) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2687) struct inode *dir = d_inode(dentry->d_parent);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2688) struct inode *inode = *inodep;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2689) int err = ext4_add_entry(handle, dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2690) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2691) err = ext4_mark_inode_dirty(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2692) if (IS_DIRSYNC(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2693) ext4_handle_sync(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2694) d_instantiate_new(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2695) *inodep = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2696) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2697) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2698) drop_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2699) ext4_orphan_add(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2700) unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2701) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2702) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2703)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2704) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2705) * By the time this is called, we already have created
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2706) * the directory cache entry for the new file, but it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2707) * is so far negative - it has no inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2708) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2709) * If the create succeeds, we fill in the inode information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2710) * with d_instantiate().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2711) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2712) static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2713) bool excl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2714) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2715) handle_t *handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2716) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2717) int err, credits, retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2718)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2719) err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2720) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2721) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2722)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2723) credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2724) EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2725) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2726) inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2727) NULL, EXT4_HT_DIR, credits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2728) handle = ext4_journal_current_handle();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2729) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2730) if (!IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2731) inode->i_op = &ext4_file_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2732) inode->i_fop = &ext4_file_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2733) ext4_set_aops(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2734) err = ext4_add_nondir(handle, dentry, &inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2735) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2736) ext4_fc_track_create(handle, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2737) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2738) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2739) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2740) if (!IS_ERR_OR_NULL(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2741) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2742) if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2743) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2744) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2745) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2746)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2747) static int ext4_mknod(struct inode *dir, struct dentry *dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2748) umode_t mode, dev_t rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2749) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2750) handle_t *handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2751) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2752) int err, credits, retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2754) err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2755) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2756) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2757)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2758) credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2759) EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2760) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2761) inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2762) NULL, EXT4_HT_DIR, credits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2763) handle = ext4_journal_current_handle();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2764) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2765) if (!IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2766) init_special_inode(inode, inode->i_mode, rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2767) inode->i_op = &ext4_special_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2768) err = ext4_add_nondir(handle, dentry, &inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2769) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2770) ext4_fc_track_create(handle, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2771) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2772) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2773) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2774) if (!IS_ERR_OR_NULL(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2775) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2776) if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2777) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2778) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2779) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2780)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2781) static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2782) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2783) handle_t *handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2784) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2785) int err, retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2786)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2787) err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2788) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2789) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2791) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2792) inode = ext4_new_inode_start_handle(dir, mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2793) NULL, 0, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2794) EXT4_HT_DIR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2795) EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2796) 4 + EXT4_XATTR_TRANS_BLOCKS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2797) handle = ext4_journal_current_handle();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2798) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2799) if (!IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2800) inode->i_op = &ext4_file_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2801) inode->i_fop = &ext4_file_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2802) ext4_set_aops(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2803) d_tmpfile(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2804) err = ext4_orphan_add(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2805) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2806) goto err_unlock_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2807) mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2808) unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2809) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2810) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2811) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2812) if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2813) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2814) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2815) err_unlock_inode:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2816) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2817) unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2818) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2819) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2820)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2821) struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2822) struct ext4_dir_entry_2 *de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2823) int blocksize, int csum_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2824) unsigned int parent_ino, int dotdot_real_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2825) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2826) de->inode = cpu_to_le32(inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2827) de->name_len = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2828) de->rec_len = ext4_rec_len_to_disk(ext4_dir_rec_len(de->name_len, NULL),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2829) blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2830) strcpy(de->name, ".");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2831) ext4_set_de_type(inode->i_sb, de, S_IFDIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2832)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2833) de = ext4_next_entry(de, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2834) de->inode = cpu_to_le32(parent_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2835) de->name_len = 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2836) if (!dotdot_real_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2837) de->rec_len = ext4_rec_len_to_disk(blocksize -
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2838) (csum_size + ext4_dir_rec_len(1, NULL)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2839) blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2840) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2841) de->rec_len = ext4_rec_len_to_disk(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2842) ext4_dir_rec_len(de->name_len, NULL),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2843) blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2844) strcpy(de->name, "..");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2845) ext4_set_de_type(inode->i_sb, de, S_IFDIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2846)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2847) return ext4_next_entry(de, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2848) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2849)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2850) int ext4_init_new_dir(handle_t *handle, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2851) struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2852) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2853) struct buffer_head *dir_block = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2854) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2855) ext4_lblk_t block = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2856) unsigned int blocksize = dir->i_sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2857) int csum_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2858) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2859)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2860) if (ext4_has_metadata_csum(dir->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2861) csum_size = sizeof(struct ext4_dir_entry_tail);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2863) if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2864) err = ext4_try_create_inline_dir(handle, dir, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2865) if (err < 0 && err != -ENOSPC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2866) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2867) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2868) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2869) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2870)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2871) inode->i_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2872) dir_block = ext4_append(handle, inode, &block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2873) if (IS_ERR(dir_block))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2874) return PTR_ERR(dir_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2875) de = (struct ext4_dir_entry_2 *)dir_block->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2876) ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2877) set_nlink(inode, 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2878) if (csum_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2879) ext4_initialize_dirent_tail(dir_block, blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2880)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2881) BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2882) err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2883) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2884) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2885) set_buffer_verified(dir_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2886) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2887) brelse(dir_block);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2888) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2889) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2890)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2891) static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2892) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2893) handle_t *handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2894) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2895) int err, err2 = 0, credits, retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2896)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2897) if (EXT4_DIR_LINK_MAX(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2898) return -EMLINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2899)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2900) err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2901) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2902) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2903)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2904) credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2905) EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2906) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2907) inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2908) &dentry->d_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2909) 0, NULL, EXT4_HT_DIR, credits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2910) handle = ext4_journal_current_handle();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2911) err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2912) if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2913) goto out_stop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2914)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2915) inode->i_op = &ext4_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2916) inode->i_fop = &ext4_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2917) err = ext4_init_new_dir(handle, dir, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2918) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2919) goto out_clear_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2920) err = ext4_mark_inode_dirty(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2921) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2922) err = ext4_add_entry(handle, dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2923) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2924) out_clear_inode:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2925) clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2926) ext4_orphan_add(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2927) unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2928) err2 = ext4_mark_inode_dirty(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2929) if (unlikely(err2))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2930) err = err2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2931) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2932) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2933) goto out_retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2934) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2935) ext4_inc_count(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2936)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2937) ext4_update_dx_flag(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2938) err = ext4_mark_inode_dirty(handle, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2939) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2940) goto out_clear_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2941) d_instantiate_new(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2942) ext4_fc_track_create(handle, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2943) if (IS_DIRSYNC(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2944) ext4_handle_sync(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2945)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2946) out_stop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2947) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2948) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2949) out_retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2950) if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2951) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2952) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2953) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2954)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2955) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2956) * routine to check that the specified directory is empty (for rmdir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2957) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2958) bool ext4_empty_dir(struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2959) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2960) unsigned int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2961) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2962) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2963) struct super_block *sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2964)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2965) if (ext4_has_inline_data(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2966) int has_inline_data = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2967) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2969) ret = empty_inline_dir(inode, &has_inline_data);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2970) if (has_inline_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2971) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2972) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2973)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2974) sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2975) if (inode->i_size < ext4_dir_rec_len(1, NULL) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2976) ext4_dir_rec_len(2, NULL)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2977) EXT4_ERROR_INODE(inode, "invalid size");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2978) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2979) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2980) /* The first directory block must not be a hole,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2981) * so treat it as DIRENT_HTREE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2982) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2983) bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2984) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2985) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2986)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2987) de = (struct ext4_dir_entry_2 *) bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2988) if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, bh->b_size, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2989) 0) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2990) le32_to_cpu(de->inode) != inode->i_ino || strcmp(".", de->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2991) ext4_warning_inode(inode, "directory missing '.'");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2992) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2993) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2994) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2995) offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2996) de = ext4_next_entry(de, sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2997) if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, bh->b_size, 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2998) offset) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2999) le32_to_cpu(de->inode) == 0 || strcmp("..", de->name)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3000) ext4_warning_inode(inode, "directory missing '..'");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3001) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3002) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3003) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3004) offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3005) while (offset < inode->i_size) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3006) if (!(offset & (sb->s_blocksize - 1))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3007) unsigned int lblock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3008) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3009) lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3010) bh = ext4_read_dirblock(inode, lblock, EITHER);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3011) if (bh == NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3012) offset += sb->s_blocksize;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3013) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3014) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3015) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3016) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3017) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3018) de = (struct ext4_dir_entry_2 *) (bh->b_data +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3019) (offset & (sb->s_blocksize - 1)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3020) if (ext4_check_dir_entry(inode, NULL, de, bh,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3021) bh->b_data, bh->b_size, 0, offset)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3022) offset = (offset | (sb->s_blocksize - 1)) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3023) continue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3024) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3025) if (le32_to_cpu(de->inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3026) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3027) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3028) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3029) offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3030) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3031) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3032) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3033) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3034)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3035) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3036) * ext4_orphan_add() links an unlinked or truncated inode into a list of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3037) * such inodes, starting at the superblock, in case we crash before the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3038) * file is closed/deleted, or in case the inode truncate spans multiple
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3039) * transactions and the last transaction is not recovered after a crash.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3040) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3041) * At filesystem recovery time, we walk this list deleting unlinked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3042) * inodes and truncating linked inodes in ext4_orphan_cleanup().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3043) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3044) * Orphan list manipulation functions must be called under i_mutex unless
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3045) * we are just creating the inode or deleting it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3046) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3047) int ext4_orphan_add(handle_t *handle, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3048) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3049) struct super_block *sb = inode->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3050) struct ext4_sb_info *sbi = EXT4_SB(sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3051) struct ext4_iloc iloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3052) int err = 0, rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3053) bool dirty = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3054)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3055) if (!sbi->s_journal || is_bad_inode(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3056) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3057)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3058) WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3059) !inode_is_locked(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3060) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3061) * Exit early if inode already is on orphan list. This is a big speedup
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3062) * since we don't have to contend on the global s_orphan_lock.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3063) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3064) if (!list_empty(&EXT4_I(inode)->i_orphan))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3065) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3066)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3067) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3068) * Orphan handling is only valid for files with data blocks
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3069) * being truncated, or files being unlinked. Note that we either
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3070) * hold i_mutex, or the inode can not be referenced from outside,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3071) * so i_nlink should not be bumped due to race
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3072) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3073) J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3074) S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3075)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3076) BUFFER_TRACE(sbi->s_sbh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3077) err = ext4_journal_get_write_access(handle, sbi->s_sbh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3078) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3079) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3080)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3081) err = ext4_reserve_inode_write(handle, inode, &iloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3082) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3083) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3084)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3085) mutex_lock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3086) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3087) * Due to previous errors inode may be already a part of on-disk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3088) * orphan list. If so skip on-disk list modification.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3089) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3090) if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) >
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3091) (le32_to_cpu(sbi->s_es->s_inodes_count))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3092) /* Insert this inode at the head of the on-disk orphan list */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3093) NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3094) sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3095) dirty = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3096) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3097) list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3098) mutex_unlock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3099)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3100) if (dirty) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3101) err = ext4_handle_dirty_super(handle, sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3102) rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3103) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3104) err = rc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3105) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3106) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3107) * We have to remove inode from in-memory list if
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3108) * addition to on disk orphan list failed. Stray orphan
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3109) * list entries can cause panics at unmount time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3110) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3111) mutex_lock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3112) list_del_init(&EXT4_I(inode)->i_orphan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3113) mutex_unlock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3114) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3115) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3116) brelse(iloc.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3117)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3118) jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3119) jbd_debug(4, "orphan inode %lu will point to %d\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3120) inode->i_ino, NEXT_ORPHAN(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3121) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3122) ext4_std_error(sb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3123) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3126) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3127) * ext4_orphan_del() removes an unlinked or truncated inode from the list
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3128) * of such inodes stored on disk, because it is finally being cleaned up.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3129) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3130) int ext4_orphan_del(handle_t *handle, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3131) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3132) struct list_head *prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3133) struct ext4_inode_info *ei = EXT4_I(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3134) struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3135) __u32 ino_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3136) struct ext4_iloc iloc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3137) int err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3138)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3139) if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3140) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3141)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3142) WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3143) !inode_is_locked(inode));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3144) /* Do this quick check before taking global s_orphan_lock. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3145) if (list_empty(&ei->i_orphan))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3146) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3148) if (handle) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3149) /* Grab inode buffer early before taking global s_orphan_lock */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3150) err = ext4_reserve_inode_write(handle, inode, &iloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3151) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3153) mutex_lock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3154) jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3156) prev = ei->i_orphan.prev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3157) list_del_init(&ei->i_orphan);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3159) /* If we're on an error path, we may not have a valid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3160) * transaction handle with which to update the orphan list on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3161) * disk, but we still need to remove the inode from the linked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3162) * list in memory. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3163) if (!handle || err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3164) mutex_unlock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3165) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3168) ino_next = NEXT_ORPHAN(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3169) if (prev == &sbi->s_orphan) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3170) jbd_debug(4, "superblock will point to %u\n", ino_next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3171) BUFFER_TRACE(sbi->s_sbh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3172) err = ext4_journal_get_write_access(handle, sbi->s_sbh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3173) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3174) mutex_unlock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3175) goto out_brelse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3176) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3177) sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3178) mutex_unlock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3179) err = ext4_handle_dirty_super(handle, inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3180) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3181) struct ext4_iloc iloc2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3182) struct inode *i_prev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3183) &list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3185) jbd_debug(4, "orphan inode %lu will point to %u\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3186) i_prev->i_ino, ino_next);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3187) err = ext4_reserve_inode_write(handle, i_prev, &iloc2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3188) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3189) mutex_unlock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3190) goto out_brelse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3191) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3192) NEXT_ORPHAN(i_prev) = ino_next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3193) err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3194) mutex_unlock(&sbi->s_orphan_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3196) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3197) goto out_brelse;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3198) NEXT_ORPHAN(inode) = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3199) err = ext4_mark_iloc_dirty(handle, inode, &iloc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3200) out_err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3201) ext4_std_error(inode->i_sb, err);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3202) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3203)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3204) out_brelse:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3205) brelse(iloc.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3206) goto out_err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3207) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3209) static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3210) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3211) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3212) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3213) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3214) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3215) handle_t *handle = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3216) ext4_lblk_t lblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3217)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3218)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3219) if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3220) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3221)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3222) /* Initialize quotas before so that eventual writes go in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3223) * separate transaction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3224) retval = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3225) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3226) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3227) retval = dquot_initialize(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3228) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3229) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3231) retval = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3232) bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL, &lblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3233) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3234) return PTR_ERR(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3235) if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3236) goto end_rmdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3238) inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3240) retval = -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3241) if (le32_to_cpu(de->inode) != inode->i_ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3242) goto end_rmdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3243)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3244) retval = -ENOTEMPTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3245) if (!ext4_empty_dir(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3246) goto end_rmdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3247)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3248) handle = ext4_journal_start(dir, EXT4_HT_DIR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3249) EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3250) if (IS_ERR(handle)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3251) retval = PTR_ERR(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3252) handle = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3253) goto end_rmdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3254) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3255)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3256) if (IS_DIRSYNC(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3257) ext4_handle_sync(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3259) retval = ext4_delete_entry(handle, dir, de, lblk, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3260) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3261) goto end_rmdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3262) if (!EXT4_DIR_LINK_EMPTY(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3263) ext4_warning_inode(inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3264) "empty directory '%.*s' has too many links (%u)",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3265) dentry->d_name.len, dentry->d_name.name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3266) inode->i_nlink);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3267) inode_inc_iversion(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3268) clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3269) /* There's no need to set i_disksize: the fact that i_nlink is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3270) * zero will ensure that the right thing happens during any
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3271) * recovery. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3272) inode->i_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3273) ext4_orphan_add(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3274) inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3275) retval = ext4_mark_inode_dirty(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3276) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3277) goto end_rmdir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3278) ext4_dec_count(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3279) ext4_update_dx_flag(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3280) ext4_fc_track_unlink(handle, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3281) retval = ext4_mark_inode_dirty(handle, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3283) #ifdef CONFIG_UNICODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3284) /* VFS negative dentries are incompatible with Encoding and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3285) * Case-insensitiveness. Eventually we'll want avoid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3286) * invalidating the dentries here, alongside with returning the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3287) * negative dentries at ext4_lookup(), when it is better
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3288) * supported by the VFS for the CI case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3289) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3290) if (IS_CASEFOLDED(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3291) d_invalidate(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3292) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3293)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3294) end_rmdir:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3295) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3296) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3297) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3298) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3300)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3301) int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3302) struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3303) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3304) int retval = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3305) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3306) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3307) int skip_remove_dentry = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3308) ext4_lblk_t lblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3310) bh = ext4_find_entry(dir, d_name, &de, NULL, &lblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3311) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3312) return PTR_ERR(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3314) if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3315) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3317) if (le32_to_cpu(de->inode) != inode->i_ino) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3318) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3319) * It's okay if we find dont find dentry which matches
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3320) * the inode. That's because it might have gotten
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3321) * renamed to a different inode number
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3322) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3323) if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3324) skip_remove_dentry = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3325) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3326) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3328)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3329) if (IS_DIRSYNC(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3330) ext4_handle_sync(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3332) if (!skip_remove_dentry) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3333) retval = ext4_delete_entry(handle, dir, de, lblk, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3334) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3335) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3336) dir->i_ctime = dir->i_mtime = current_time(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3337) ext4_update_dx_flag(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3338) retval = ext4_mark_inode_dirty(handle, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3339) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3340) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3341) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3342) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3344) if (inode->i_nlink == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3345) ext4_warning_inode(inode, "Deleting file '%.*s' with no links",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3346) d_name->len, d_name->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3347) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3348) drop_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3349) if (!inode->i_nlink)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3350) ext4_orphan_add(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3351) inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3352) retval = ext4_mark_inode_dirty(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3353)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3354) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3355) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3356) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3357) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3358)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3359) static int ext4_unlink(struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3360) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3361) handle_t *handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3362) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3363)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3364) if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3365) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3366)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3367) trace_ext4_unlink_enter(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3368) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3369) * Initialize quotas before so that eventual writes go
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3370) * in separate transaction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3371) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3372) retval = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3373) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3374) goto out_trace;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3375) retval = dquot_initialize(d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3376) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3377) goto out_trace;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3378)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3379) handle = ext4_journal_start(dir, EXT4_HT_DIR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3380) EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3381) if (IS_ERR(handle)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3382) retval = PTR_ERR(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3383) goto out_trace;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3385)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3386) retval = __ext4_unlink(handle, dir, &dentry->d_name, d_inode(dentry));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3387) if (!retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3388) ext4_fc_track_unlink(handle, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3389) #ifdef CONFIG_UNICODE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3390) /* VFS negative dentries are incompatible with Encoding and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3391) * Case-insensitiveness. Eventually we'll want avoid
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3392) * invalidating the dentries here, alongside with returning the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3393) * negative dentries at ext4_lookup(), when it is better
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3394) * supported by the VFS for the CI case.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3395) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3396) if (IS_CASEFOLDED(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3397) d_invalidate(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3398) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3399) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3400) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3402) out_trace:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3403) trace_ext4_unlink_exit(dentry, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3404) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3405) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3406)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3407) static int ext4_symlink(struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3408) struct dentry *dentry, const char *symname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3410) handle_t *handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3411) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3412) int err, len = strlen(symname);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3413) int credits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3414) struct fscrypt_str disk_link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3416) if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3417) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3418)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3419) err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3420) &disk_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3421) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3422) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3424) err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3425) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3426) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3428) if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3429) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3430) * For non-fast symlinks, we just allocate inode and put it on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3431) * orphan list in the first transaction => we need bitmap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3432) * group descriptor, sb, inode block, quota blocks, and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3433) * possibly selinux xattr blocks.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3434) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3435) credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3436) EXT4_XATTR_TRANS_BLOCKS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3437) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3438) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3439) * Fast symlink. We have to add entry to directory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3440) * (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3441) * allocate new inode (bitmap, group descriptor, inode block,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3442) * quota blocks, sb is already counted in previous macros).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3443) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3444) credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3445) EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3446) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3447)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3448) inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3449) &dentry->d_name, 0, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3450) EXT4_HT_DIR, credits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3451) handle = ext4_journal_current_handle();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3452) if (IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3453) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3454) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3455) return PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3456) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3457)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3458) if (IS_ENCRYPTED(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3459) err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3460) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3461) goto err_drop_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3462) inode->i_op = &ext4_encrypted_symlink_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3463) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3464)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3465) if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3466) if (!IS_ENCRYPTED(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3467) inode->i_op = &ext4_symlink_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3468) inode_nohighmem(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3469) ext4_set_aops(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3470) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3471) * We cannot call page_symlink() with transaction started
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3472) * because it calls into ext4_write_begin() which can wait
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3473) * for transaction commit if we are running out of space
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3474) * and thus we deadlock. So we have to stop transaction now
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3475) * and restart it when symlink contents is written.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3476) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3477) * To keep fs consistent in case of crash, we have to put inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3478) * to orphan list in the mean time.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3479) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3480) drop_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3481) err = ext4_orphan_add(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3482) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3483) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3484) handle = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3485) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3486) goto err_drop_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3487) err = __page_symlink(inode, disk_link.name, disk_link.len, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3488) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3489) goto err_drop_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3490) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3491) * Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3492) * + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3493) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3494) handle = ext4_journal_start(dir, EXT4_HT_DIR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3495) EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3496) EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3497) if (IS_ERR(handle)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3498) err = PTR_ERR(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3499) handle = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3500) goto err_drop_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3501) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3502) set_nlink(inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3503) err = ext4_orphan_del(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3504) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3505) goto err_drop_inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3506) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3507) /* clear the extent format for fast symlink */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3508) ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3509) if (!IS_ENCRYPTED(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3510) inode->i_op = &ext4_fast_symlink_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3511) inode->i_link = (char *)&EXT4_I(inode)->i_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3512) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3513) memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3514) disk_link.len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3515) inode->i_size = disk_link.len - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3516) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3517) EXT4_I(inode)->i_disksize = inode->i_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3518) err = ext4_add_nondir(handle, dentry, &inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3519) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3520) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3521) if (inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3522) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3523) goto out_free_encrypted_link;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3524)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3525) err_drop_inode:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3526) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3527) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3528) clear_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3529) unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3530) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3531) out_free_encrypted_link:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3532) if (disk_link.name != (unsigned char *)symname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3533) kfree(disk_link.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3534) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3535) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3536)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3537) int __ext4_link(struct inode *dir, struct inode *inode, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3538) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3539) handle_t *handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3540) int err, retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3541) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3542) handle = ext4_journal_start(dir, EXT4_HT_DIR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3543) (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3544) EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3545) if (IS_ERR(handle))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3546) return PTR_ERR(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3547)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3548) if (IS_DIRSYNC(dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3549) ext4_handle_sync(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3551) inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3552) ext4_inc_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3553) ihold(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3554)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3555) err = ext4_add_entry(handle, dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3556) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3557) err = ext4_mark_inode_dirty(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3558) /* this can happen only for tmpfile being
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3559) * linked the first time
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3560) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3561) if (inode->i_nlink == 1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3562) ext4_orphan_del(handle, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3563) d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3564) ext4_fc_track_link(handle, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3565) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3566) drop_nlink(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3567) iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3568) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3569) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3570) if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3571) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3572) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3573) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3575) static int ext4_link(struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3576) struct inode *dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3577) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3578) struct inode *inode = d_inode(old_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3579) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3580)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3581) if (inode->i_nlink >= EXT4_LINK_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3582) return -EMLINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3583)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3584) err = fscrypt_prepare_link(old_dentry, dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3585) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3586) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3587)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3588) if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3589) (!projid_eq(EXT4_I(dir)->i_projid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3590) EXT4_I(old_dentry->d_inode)->i_projid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3591) return -EXDEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3592)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3593) err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3594) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3595) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3596) return __ext4_link(dir, inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3597) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3598)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3599) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3600) * Try to find buffer head where contains the parent block.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3601) * It should be the inode block if it is inlined or the 1st block
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3602) * if it is a normal dir.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3603) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3604) static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3605) struct inode *inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3606) int *retval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3607) struct ext4_dir_entry_2 **parent_de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3608) int *inlined)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3609) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3610) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3611)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3612) if (!ext4_has_inline_data(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3613) /* The first directory block must not be a hole, so
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3614) * treat it as DIRENT_HTREE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3615) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3616) bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3617) if (IS_ERR(bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3618) *retval = PTR_ERR(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3619) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3620) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3621) *parent_de = ext4_next_entry(
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3622) (struct ext4_dir_entry_2 *)bh->b_data,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3623) inode->i_sb->s_blocksize);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3624) return bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3625) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3626)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3627) *inlined = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3628) return ext4_get_first_inline_block(inode, parent_de, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3629) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3630)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3631) struct ext4_renament {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3632) struct inode *dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3633) struct dentry *dentry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3634) struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3635) bool is_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3636) int dir_nlink_delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3638) /* entry for "dentry" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3639) ext4_lblk_t lblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3640) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3641) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3642) int inlined;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3643)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3644) /* entry for ".." in inode if it's a directory */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3645) struct buffer_head *dir_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3646) struct ext4_dir_entry_2 *parent_de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3647) int dir_inlined;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3648) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3649)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3650) static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3651) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3652) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3653)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3654) ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3655) &retval, &ent->parent_de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3656) &ent->dir_inlined);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3657) if (!ent->dir_bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3658) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3659) if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3660) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3661) BUFFER_TRACE(ent->dir_bh, "get_write_access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3662) return ext4_journal_get_write_access(handle, ent->dir_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3663) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3665) static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3666) unsigned dir_ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3667) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3668) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3669)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3670) ent->parent_de->inode = cpu_to_le32(dir_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3671) BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3672) if (!ent->dir_inlined) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3673) if (is_dx(ent->inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3674) retval = ext4_handle_dirty_dx_node(handle,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3675) ent->inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3676) ent->dir_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3677) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3678) retval = ext4_handle_dirty_dirblock(handle, ent->inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3679) ent->dir_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3680) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3681) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3682) retval = ext4_mark_inode_dirty(handle, ent->inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3683) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3684) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3685) ext4_std_error(ent->dir->i_sb, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3686) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3687) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3688) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3689) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3691) static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3692) unsigned ino, unsigned file_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3693) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3694) int retval, retval2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3695)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3696) BUFFER_TRACE(ent->bh, "get write access");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3697) retval = ext4_journal_get_write_access(handle, ent->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3698) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3699) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3700) ent->de->inode = cpu_to_le32(ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3701) if (ext4_has_feature_filetype(ent->dir->i_sb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3702) ent->de->file_type = file_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3703) inode_inc_iversion(ent->dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3704) ent->dir->i_ctime = ent->dir->i_mtime =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3705) current_time(ent->dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3706) retval = ext4_mark_inode_dirty(handle, ent->dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3707) BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3708) if (!ent->inlined) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3709) retval2 = ext4_handle_dirty_dirblock(handle, ent->dir, ent->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3710) if (unlikely(retval2)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3711) ext4_std_error(ent->dir->i_sb, retval2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3712) return retval2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3713) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3714) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3715) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3716) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3718) static void ext4_resetent(handle_t *handle, struct ext4_renament *ent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3719) unsigned ino, unsigned file_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3720) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3721) struct ext4_renament old = *ent;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3722) int retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3724) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3725) * old->de could have moved from under us during make indexed dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3726) * so the old->de may no longer valid and need to find it again
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3727) * before reset old inode info.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3728) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3729) old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3730) NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3731) if (IS_ERR(old.bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3732) retval = PTR_ERR(old.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3733) if (!old.bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3734) retval = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3735) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3736) ext4_std_error(old.dir->i_sb, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3737) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3738) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3739)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3740) ext4_setent(handle, &old, ino, file_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3741) brelse(old.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3742) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3743)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3744) static int ext4_find_delete_entry(handle_t *handle, struct inode *dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3745) const struct qstr *d_name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3746) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3747) int retval = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3748) struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3749) struct ext4_dir_entry_2 *de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3750) ext4_lblk_t lblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3751)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3752) bh = ext4_find_entry(dir, d_name, &de, NULL, &lblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3753) if (IS_ERR(bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3754) return PTR_ERR(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3755) if (bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3756) retval = ext4_delete_entry(handle, dir, de, lblk, bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3757) brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3758) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3759) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3760) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3761)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3762) static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3763) int force_reread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3764) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3765) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3766) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3767) * ent->de could have moved from under us during htree split, so make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3768) * sure that we are deleting the right entry. We might also be pointing
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3769) * to a stale entry in the unused part of ent->bh so just checking inum
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3770) * and the name isn't enough.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3771) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3772) if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3773) ent->de->name_len != ent->dentry->d_name.len ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3774) strncmp(ent->de->name, ent->dentry->d_name.name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3775) ent->de->name_len) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3776) force_reread) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3777) retval = ext4_find_delete_entry(handle, ent->dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3778) &ent->dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3779) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3780) retval = ext4_delete_entry(handle, ent->dir, ent->de,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3781) ent->lblk, ent->bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3782) if (retval == -ENOENT) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3783) retval = ext4_find_delete_entry(handle, ent->dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3784) &ent->dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3785) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3786) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3788) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3789) ext4_warning_inode(ent->dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3790) "Deleting old file: nlink %d, error=%d",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3791) ent->dir->i_nlink, retval);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3792) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3793) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3795) static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3796) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3797) if (ent->dir_nlink_delta) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3798) if (ent->dir_nlink_delta == -1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3799) ext4_dec_count(ent->dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3800) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3801) ext4_inc_count(ent->dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3802) ext4_mark_inode_dirty(handle, ent->dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3803) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3804) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3805)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3806) static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3807) int credits, handle_t **h)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3808) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3809) struct inode *wh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3810) handle_t *handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3811) int retries = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3812)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3813) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3814) * for inode block, sb block, group summaries,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3815) * and inode bitmap
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3816) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3817) credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3818) EXT4_XATTR_TRANS_BLOCKS + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3819) retry:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3820) wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3821) &ent->dentry->d_name, 0, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3822) EXT4_HT_DIR, credits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3824) handle = ext4_journal_current_handle();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3825) if (IS_ERR(wh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3826) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3827) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3828) if (PTR_ERR(wh) == -ENOSPC &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3829) ext4_should_retry_alloc(ent->dir->i_sb, &retries))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3830) goto retry;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3831) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3832) *h = handle;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3833) init_special_inode(wh, wh->i_mode, WHITEOUT_DEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3834) wh->i_op = &ext4_special_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3835) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3836) return wh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3837) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3839) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3840) * Anybody can rename anything with this: the permission checks are left to the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3841) * higher-level routines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3842) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3843) * n.b. old_{dentry,inode) refers to the source dentry/inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3844) * while new_{dentry,inode) refers to the destination dentry/inode
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3845) * This comes from rename(const char *oldpath, const char *newpath)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3846) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3847) static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3848) struct inode *new_dir, struct dentry *new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3849) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3850) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3851) handle_t *handle = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3852) struct ext4_renament old = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3853) .dir = old_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3854) .dentry = old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3855) .inode = d_inode(old_dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3856) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3857) struct ext4_renament new = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3858) .dir = new_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3859) .dentry = new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3860) .inode = d_inode(new_dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3861) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3862) int force_reread;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3863) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3864) struct inode *whiteout = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3865) int credits;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3866) u8 old_file_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3867)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3868) if (new.inode && new.inode->i_nlink == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3869) EXT4_ERROR_INODE(new.inode,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3870) "target of rename is already freed");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3871) return -EFSCORRUPTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3872) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3873)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3874) if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3875) (!projid_eq(EXT4_I(new_dir)->i_projid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3876) EXT4_I(old_dentry->d_inode)->i_projid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3877) return -EXDEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3878)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3879) retval = dquot_initialize(old.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3880) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3881) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3882) retval = dquot_initialize(new.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3883) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3884) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3885)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3886) /* Initialize quotas before so that eventual writes go
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3887) * in separate transaction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3888) if (new.inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3889) retval = dquot_initialize(new.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3890) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3891) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3892) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3893)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3894) old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3895) &old.lblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3896) if (IS_ERR(old.bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3897) return PTR_ERR(old.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3898) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3899) * Check for inode number is _not_ due to possible IO errors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3900) * We might rmdir the source, keep it as pwd of some process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3901) * and merrily kill the link to whatever was created under the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3902) * same name. Goodbye sticky bit ;-<
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3903) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3904) retval = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3905) if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3906) goto release_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3907)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3908) new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3909) &new.de, &new.inlined, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3910) if (IS_ERR(new.bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3911) retval = PTR_ERR(new.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3912) new.bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3913) goto release_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3914) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3915) if (new.bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3916) if (!new.inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3917) brelse(new.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3918) new.bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3919) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3920) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3921) if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3922) ext4_alloc_da_blocks(old.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3924) credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3925) EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3926) if (!(flags & RENAME_WHITEOUT)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3927) handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3928) if (IS_ERR(handle)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3929) retval = PTR_ERR(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3930) goto release_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3931) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3932) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3933) whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3934) if (IS_ERR(whiteout)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3935) retval = PTR_ERR(whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3936) goto release_bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3937) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3938) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3939)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3940) old_file_type = old.de->file_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3941) if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3942) ext4_handle_sync(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3943)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3944) if (S_ISDIR(old.inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3945) if (new.inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3946) retval = -ENOTEMPTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3947) if (!ext4_empty_dir(new.inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3948) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3949) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3950) retval = -EMLINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3951) if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3952) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3953) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3954) retval = ext4_rename_dir_prepare(handle, &old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3955) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3956) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3957) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3958) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3959) * If we're renaming a file within an inline_data dir and adding or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3960) * setting the new dirent causes a conversion from inline_data to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3961) * extents/blockmap, we need to force the dirent delete code to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3962) * re-read the directory, or else we end up trying to delete a dirent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3963) * from what is now the extent tree root (or a block map).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3964) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3965) force_reread = (new.dir->i_ino == old.dir->i_ino &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3966) ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3967)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3968) if (whiteout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3969) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3970) * Do this before adding a new entry, so the old entry is sure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3971) * to be still pointing to the valid old entry.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3972) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3973) retval = ext4_setent(handle, &old, whiteout->i_ino,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3974) EXT4_FT_CHRDEV);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3975) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3976) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3977) retval = ext4_mark_inode_dirty(handle, whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3978) if (unlikely(retval))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3979) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3981) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3982) if (!new.bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3983) retval = ext4_add_entry(handle, new.dentry, old.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3984) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3985) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3986) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3987) retval = ext4_setent(handle, &new,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3988) old.inode->i_ino, old_file_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3989) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3990) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3991) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3992) if (force_reread)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3993) force_reread = !ext4_test_inode_flag(new.dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3994) EXT4_INODE_INLINE_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3995)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3996) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3997) * Like most other Unix systems, set the ctime for inodes on a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3998) * rename.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3999) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4000) old.inode->i_ctime = current_time(old.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4001) retval = ext4_mark_inode_dirty(handle, old.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4002) if (unlikely(retval))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4003) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4004)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4005) if (!whiteout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4006) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4007) * ok, that's it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4008) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4009) ext4_rename_delete(handle, &old, force_reread);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4010) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4011)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4012) if (new.inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4013) ext4_dec_count(new.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4014) new.inode->i_ctime = current_time(new.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4015) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4016) old.dir->i_ctime = old.dir->i_mtime = current_time(old.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4017) ext4_update_dx_flag(old.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4018) if (old.dir_bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4019) retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4020) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4021) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4022)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4023) ext4_dec_count(old.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4024) if (new.inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4025) /* checked ext4_empty_dir above, can't have another
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4026) * parent, ext4_dec_count() won't work for many-linked
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4027) * dirs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4028) clear_nlink(new.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4029) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4030) ext4_inc_count(new.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4031) ext4_update_dx_flag(new.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4032) retval = ext4_mark_inode_dirty(handle, new.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4033) if (unlikely(retval))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4034) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4035) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4036) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4037) retval = ext4_mark_inode_dirty(handle, old.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4038) if (unlikely(retval))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4039) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4040)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4041) if (S_ISDIR(old.inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4042) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4043) * We disable fast commits here that's because the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4044) * replay code is not yet capable of changing dot dot
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4045) * dirents in directories.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4046) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4047) ext4_fc_mark_ineligible(old.inode->i_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4048) EXT4_FC_REASON_RENAME_DIR);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4049) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4050) if (new.inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4051) ext4_fc_track_unlink(handle, new.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4052) __ext4_fc_track_link(handle, old.inode, new.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4053) __ext4_fc_track_unlink(handle, old.inode, old.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4054) if (whiteout)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4055) __ext4_fc_track_create(handle, whiteout, old.dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4056) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4057)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4058) if (new.inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4059) retval = ext4_mark_inode_dirty(handle, new.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4060) if (unlikely(retval))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4061) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4062) if (!new.inode->i_nlink)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4063) ext4_orphan_add(handle, new.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4064) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4065) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4066)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4067) end_rename:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4068) if (whiteout) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4069) if (retval) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4070) ext4_resetent(handle, &old,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4071) old.inode->i_ino, old_file_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4072) drop_nlink(whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4073) ext4_orphan_add(handle, whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4074) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4075) unlock_new_inode(whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4076) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4077) iput(whiteout);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4078) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4079) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4080) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4081) release_bh:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4082) brelse(old.dir_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4083) brelse(old.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4084) brelse(new.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4085) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4086) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4087)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4088) static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4089) struct inode *new_dir, struct dentry *new_dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4090) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4091) handle_t *handle = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4092) struct ext4_renament old = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4093) .dir = old_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4094) .dentry = old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4095) .inode = d_inode(old_dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4096) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4097) struct ext4_renament new = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4098) .dir = new_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4099) .dentry = new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4100) .inode = d_inode(new_dentry),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4101) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4102) u8 new_file_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4103) int retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4104) struct timespec64 ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4106) if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4107) !projid_eq(EXT4_I(new_dir)->i_projid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4108) EXT4_I(old_dentry->d_inode)->i_projid)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4109) (ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4110) !projid_eq(EXT4_I(old_dir)->i_projid,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4111) EXT4_I(new_dentry->d_inode)->i_projid)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4112) return -EXDEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4114) retval = dquot_initialize(old.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4115) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4116) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4117) retval = dquot_initialize(new.dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4118) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4119) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4121) old.bh = ext4_find_entry(old.dir, &old.dentry->d_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4122) &old.de, &old.inlined, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4123) if (IS_ERR(old.bh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4124) return PTR_ERR(old.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4125) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4126) * Check for inode number is _not_ due to possible IO errors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4127) * We might rmdir the source, keep it as pwd of some process
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4128) * and merrily kill the link to whatever was created under the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4129) * same name. Goodbye sticky bit ;-<
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4130) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4131) retval = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4132) if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4133) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4135) new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4136) &new.de, &new.inlined, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4137) if (IS_ERR(new.bh)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4138) retval = PTR_ERR(new.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4139) new.bh = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4140) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4143) /* RENAME_EXCHANGE case: old *and* new must both exist */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4144) if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4145) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4146)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4147) handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4148) (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4149) 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4150) if (IS_ERR(handle)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4151) retval = PTR_ERR(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4152) handle = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4153) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4154) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4155)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4156) if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4157) ext4_handle_sync(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4159) if (S_ISDIR(old.inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4160) old.is_dir = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4161) retval = ext4_rename_dir_prepare(handle, &old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4162) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4163) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4165) if (S_ISDIR(new.inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4166) new.is_dir = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4167) retval = ext4_rename_dir_prepare(handle, &new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4168) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4169) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4172) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4173) * Other than the special case of overwriting a directory, parents'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4174) * nlink only needs to be modified if this is a cross directory rename.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4175) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4176) if (old.dir != new.dir && old.is_dir != new.is_dir) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4177) old.dir_nlink_delta = old.is_dir ? -1 : 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4178) new.dir_nlink_delta = -old.dir_nlink_delta;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4179) retval = -EMLINK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4180) if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4181) (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4182) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4183) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4185) new_file_type = new.de->file_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4186) retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4187) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4188) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4189)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4190) retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4191) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4192) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4194) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4195) * Like most other Unix systems, set the ctime for inodes on a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4196) * rename.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4197) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4198) ctime = current_time(old.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4199) old.inode->i_ctime = ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4200) new.inode->i_ctime = ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4201) retval = ext4_mark_inode_dirty(handle, old.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4202) if (unlikely(retval))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4203) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4204) retval = ext4_mark_inode_dirty(handle, new.inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4205) if (unlikely(retval))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4206) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4207) ext4_fc_mark_ineligible(new.inode->i_sb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4208) EXT4_FC_REASON_CROSS_RENAME);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4209) if (old.dir_bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4210) retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4211) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4212) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4214) if (new.dir_bh) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4215) retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4216) if (retval)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4217) goto end_rename;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4219) ext4_update_dir_count(handle, &old);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4220) ext4_update_dir_count(handle, &new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4221) retval = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4222)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4223) end_rename:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4224) brelse(old.dir_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4225) brelse(new.dir_bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4226) brelse(old.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4227) brelse(new.bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4228) if (handle)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4229) ext4_journal_stop(handle);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4230) return retval;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4232)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4233) static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4234) struct inode *new_dir, struct dentry *new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4235) unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4236) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4237) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4238)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4239) if (unlikely(ext4_forced_shutdown(EXT4_SB(old_dir->i_sb))))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4240) return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4241)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4242) if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4243) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4245) err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4246) flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4247) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4248) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4250) if (flags & RENAME_EXCHANGE) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4251) return ext4_cross_rename(old_dir, old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4252) new_dir, new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4255) return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4258) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4259) * directories can handle most operations...
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4260) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4261) const struct inode_operations ext4_dir_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4262) .create = ext4_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4263) .lookup = ext4_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4264) .link = ext4_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4265) .unlink = ext4_unlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4266) .symlink = ext4_symlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4267) .mkdir = ext4_mkdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4268) .rmdir = ext4_rmdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4269) .mknod = ext4_mknod,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4270) .tmpfile = ext4_tmpfile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4271) .rename = ext4_rename2,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4272) .setattr = ext4_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4273) .getattr = ext4_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4274) .listxattr = ext4_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4275) .get_acl = ext4_get_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4276) .set_acl = ext4_set_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4277) .fiemap = ext4_fiemap,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4278) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4279)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4280) const struct inode_operations ext4_special_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4281) .setattr = ext4_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4282) .getattr = ext4_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4283) .listxattr = ext4_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4284) .get_acl = ext4_get_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4285) .set_acl = ext4_set_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4286) };
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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