Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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// SPDX-License-Identifier: GPL-2.0
/*
* linux/fs/ext4/namei.c
*
* Copyright (C) 1992, 1993, 1994, 1995
* Remy Card (card@masi.ibp.fr)
* Laboratoire MASI - Institut Blaise Pascal
* Universite Pierre et Marie Curie (Paris VI)
*
* from
*
* linux/fs/minix/namei.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*
* Big-endian to little-endian byte-swapping/bitmaps by
* David S. Miller (davem@caip.rutgers.edu), 1995
* Directory entry file type support and forward compatibility hooks
* for B-tree directories by Theodore Ts'o (tytso@mit.edu), 1998
* Hash Tree Directory indexing (c)
* Daniel Phillips, 2001
* Hash Tree Directory indexing porting
* Christopher Li, 2002
* Hash Tree Directory indexing cleanup
* Theodore Ts'o, 2002
*/
#include <linux/fs.h>
#include <linux/pagemap.h>
#include <linux/time.h>
#include <linux/fcntl.h>
#include <linux/stat.h>
#include <linux/string.h>
#include <linux/quotaops.h>
#include <linux/buffer_head.h>
#include <linux/bio.h>
#include <linux/iversion.h>
#include <linux/unicode.h>
#include "ext4.h"
#include "ext4_jbd2.h"
#include "xattr.h"
#include "acl.h"
#include <trace/events/ext4.h>
/*
* define how far ahead to read directories while searching them.
*/
#define NAMEI_RA_CHUNKS 2
#define NAMEI_RA_BLOCKS 4
#define NAMEI_RA_SIZE (NAMEI_RA_CHUNKS * NAMEI_RA_BLOCKS)
static struct buffer_head *ext4_append(handle_t *handle,
<------><------><------><------><------>struct inode *inode,
<------><------><------><------><------>ext4_lblk_t *block)
{
<------>struct buffer_head *bh;
<------>int err;
<------>if (unlikely(EXT4_SB(inode->i_sb)->s_max_dir_size_kb &&
<------><------> ((inode->i_size >> 10) >=
<------><------> EXT4_SB(inode->i_sb)->s_max_dir_size_kb)))
<------><------>return ERR_PTR(-ENOSPC);
<------>*block = inode->i_size >> inode->i_sb->s_blocksize_bits;
<------>bh = ext4_bread(handle, inode, *block, EXT4_GET_BLOCKS_CREATE);
<------>if (IS_ERR(bh))
<------><------>return bh;
<------>inode->i_size += inode->i_sb->s_blocksize;
<------>EXT4_I(inode)->i_disksize = inode->i_size;
<------>BUFFER_TRACE(bh, "get_write_access");
<------>err = ext4_journal_get_write_access(handle, bh);
<------>if (err) {
<------><------>brelse(bh);
<------><------>ext4_std_error(inode->i_sb, err);
<------><------>return ERR_PTR(err);
<------>}
<------>return bh;
}
static int ext4_dx_csum_verify(struct inode *inode,
<------><------><------> struct ext4_dir_entry *dirent);
/*
* Hints to ext4_read_dirblock regarding whether we expect a directory
* block being read to be an index block, or a block containing
* directory entries (and if the latter, whether it was found via a
* logical block in an htree index block). This is used to control
* what sort of sanity checkinig ext4_read_dirblock() will do on the
* directory block read from the storage device. EITHER will means
* the caller doesn't know what kind of directory block will be read,
* so no specific verification will be done.
*/
typedef enum {
<------>EITHER, INDEX, DIRENT, DIRENT_HTREE
} dirblock_type_t;
#define ext4_read_dirblock(inode, block, type) \
<------>__ext4_read_dirblock((inode), (block), (type), __func__, __LINE__)
static struct buffer_head *__ext4_read_dirblock(struct inode *inode,
<------><------><------><------><------><------>ext4_lblk_t block,
<------><------><------><------><------><------>dirblock_type_t type,
<------><------><------><------><------><------>const char *func,
<------><------><------><------><------><------>unsigned int line)
{
<------>struct buffer_head *bh;
<------>struct ext4_dir_entry *dirent;
<------>int is_dx_block = 0;
<------>if (ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_EIO))
<------><------>bh = ERR_PTR(-EIO);
<------>else
<------><------>bh = ext4_bread(NULL, inode, block, 0);
<------>if (IS_ERR(bh)) {
<------><------>__ext4_warning(inode->i_sb, func, line,
<------><------><------> "inode #%lu: lblock %lu: comm %s: "
<------><------><------> "error %ld reading directory block",
<------><------><------> inode->i_ino, (unsigned long)block,
<------><------><------> current->comm, PTR_ERR(bh));
<------><------>return bh;
<------>}
<------>if (!bh && (type == INDEX || type == DIRENT_HTREE)) {
<------><------>ext4_error_inode(inode, func, line, block,
<------><------><------><------> "Directory hole found for htree %s block",
<------><------><------><------> (type == INDEX) ? "index" : "leaf");
<------><------>return ERR_PTR(-EFSCORRUPTED);
<------>}
<------>if (!bh)
<------><------>return NULL;
<------>dirent = (struct ext4_dir_entry *) bh->b_data;
<------>/* Determine whether or not we have an index block */
<------>if (is_dx(inode)) {
<------><------>if (block == 0)
<------><------><------>is_dx_block = 1;
<------><------>else if (ext4_rec_len_from_disk(dirent->rec_len,
<------><------><------><------><------><------>inode->i_sb->s_blocksize) ==
<------><------><------> inode->i_sb->s_blocksize)
<------><------><------>is_dx_block = 1;
<------>}
<------>if (!is_dx_block && type == INDEX) {
<------><------>ext4_error_inode(inode, func, line, block,
<------><------> "directory leaf block found instead of index block");
<------><------>brelse(bh);
<------><------>return ERR_PTR(-EFSCORRUPTED);
<------>}
<------>if (!ext4_has_metadata_csum(inode->i_sb) ||
<------> buffer_verified(bh))
<------><------>return bh;
<------>/*
<------> * An empty leaf block can get mistaken for a index block; for
<------> * this reason, we can only check the index checksum when the
<------> * caller is sure it should be an index block.
<------> */
<------>if (is_dx_block && type == INDEX) {
<------><------>if (ext4_dx_csum_verify(inode, dirent) &&
<------><------> !ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC))
<------><------><------>set_buffer_verified(bh);
<------><------>else {
<------><------><------>ext4_error_inode_err(inode, func, line, block,
<------><------><------><------><------> EFSBADCRC,
<------><------><------><------><------> "Directory index failed checksum");
<------><------><------>brelse(bh);
<------><------><------>return ERR_PTR(-EFSBADCRC);
<------><------>}
<------>}
<------>if (!is_dx_block) {
<------><------>if (ext4_dirblock_csum_verify(inode, bh) &&
<------><------> !ext4_simulate_fail(inode->i_sb, EXT4_SIM_DIRBLOCK_CRC))
<------><------><------>set_buffer_verified(bh);
<------><------>else {
<------><------><------>ext4_error_inode_err(inode, func, line, block,
<------><------><------><------><------> EFSBADCRC,
<------><------><------><------><------> "Directory block failed checksum");
<------><------><------>brelse(bh);
<------><------><------>return ERR_PTR(-EFSBADCRC);
<------><------>}
<------>}
<------>return bh;
}
#ifndef assert
#define assert(test) J_ASSERT(test)
#endif
#ifdef DX_DEBUG
#define dxtrace(command) command
#else
#define dxtrace(command)
#endif
struct fake_dirent
{
<------>__le32 inode;
<------>__le16 rec_len;
<------>u8 name_len;
<------>u8 file_type;
};
struct dx_countlimit
{
<------>__le16 limit;
<------>__le16 count;
};
struct dx_entry
{
<------>__le32 hash;
<------>__le32 block;
};
/*
* dx_root_info is laid out so that if it should somehow get overlaid by a
* dirent the two low bits of the hash version will be zero. Therefore, the
* hash version mod 4 should never be 0. Sincerely, the paranoia department.
*/
struct dx_root
{
<------>struct fake_dirent dot;
<------>char dot_name[4];
<------>struct fake_dirent dotdot;
<------>char dotdot_name[4];
<------>struct dx_root_info
<------>{
<------><------>__le32 reserved_zero;
<------><------>u8 hash_version;
<------><------>u8 info_length; /* 8 */
<------><------>u8 indirect_levels;
<------><------>u8 unused_flags;
<------>}
<------>info;
<------>struct dx_entry entries[];
};
struct dx_node
{
<------>struct fake_dirent fake;
<------>struct dx_entry entries[];
};
struct dx_frame
{
<------>struct buffer_head *bh;
<------>struct dx_entry *entries;
<------>struct dx_entry *at;
};
struct dx_map_entry
{
<------>u32 hash;
<------>u16 offs;
<------>u16 size;
};
/*
* This goes at the end of each htree block.
*/
struct dx_tail {
<------>u32 dt_reserved;
<------>__le32 dt_checksum; /* crc32c(uuid+inum+dirblock) */
};
static inline ext4_lblk_t dx_get_block(struct dx_entry *entry);
static void dx_set_block(struct dx_entry *entry, ext4_lblk_t value);
static inline unsigned dx_get_hash(struct dx_entry *entry);
static void dx_set_hash(struct dx_entry *entry, unsigned value);
static unsigned dx_get_count(struct dx_entry *entries);
static unsigned dx_get_limit(struct dx_entry *entries);
static void dx_set_count(struct dx_entry *entries, unsigned value);
static void dx_set_limit(struct dx_entry *entries, unsigned value);
static unsigned dx_root_limit(struct inode *dir, unsigned infosize);
static unsigned dx_node_limit(struct inode *dir);
static struct dx_frame *dx_probe(struct ext4_filename *fname,
<------><------><------><------> struct inode *dir,
<------><------><------><------> struct dx_hash_info *hinfo,
<------><------><------><------> struct dx_frame *frame);
static void dx_release(struct dx_frame *frames);
static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
<------><------> unsigned blocksize, struct dx_hash_info *hinfo,
<------><------> struct dx_map_entry map[]);
static void dx_sort_map(struct dx_map_entry *map, unsigned count);
static struct ext4_dir_entry_2 *dx_move_dirents(struct inode *dir, char *from,
<------><------><------><------><------>char *to, struct dx_map_entry *offsets,
<------><------><------><------><------>int count, unsigned int blocksize);
static struct ext4_dir_entry_2 *dx_pack_dirents(struct inode *dir, char *base,
<------><------><------><------><------><------>unsigned int blocksize);
static void dx_insert_block(struct dx_frame *frame,
<------><------><------><------><------>u32 hash, ext4_lblk_t block);
static int ext4_htree_next_block(struct inode *dir, __u32 hash,
<------><------><------><------> struct dx_frame *frame,
<------><------><------><------> struct dx_frame *frames,
<------><------><------><------> __u32 *start_hash);
static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
<------><------>struct ext4_filename *fname,
<------><------>struct ext4_dir_entry_2 **res_dir, ext4_lblk_t *lblk);
static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
<------><------><------> struct inode *dir, struct inode *inode);
/* checksumming functions */
void ext4_initialize_dirent_tail(struct buffer_head *bh,
<------><------><------><------> unsigned int blocksize)
{
<------>struct ext4_dir_entry_tail *t = EXT4_DIRENT_TAIL(bh->b_data, blocksize);
<------>memset(t, 0, sizeof(struct ext4_dir_entry_tail));
<------>t->det_rec_len = ext4_rec_len_to_disk(
<------><------><------>sizeof(struct ext4_dir_entry_tail), blocksize);
<------>t->det_reserved_ft = EXT4_FT_DIR_CSUM;
}
/* Walk through a dirent block to find a checksum "dirent" at the tail */
static struct ext4_dir_entry_tail *get_dirent_tail(struct inode *inode,
<------><------><------><------><------><------> struct buffer_head *bh)
{
<------>struct ext4_dir_entry_tail *t;
#ifdef PARANOID
<------>struct ext4_dir_entry *d, *top;
<------>d = (struct ext4_dir_entry *)bh->b_data;
<------>top = (struct ext4_dir_entry *)(bh->b_data +
<------><------>(EXT4_BLOCK_SIZE(inode->i_sb) -
<------><------> sizeof(struct ext4_dir_entry_tail)));
<------>while (d < top && d->rec_len)
<------><------>d = (struct ext4_dir_entry *)(((void *)d) +
<------><------> le16_to_cpu(d->rec_len));
<------>if (d != top)
<------><------>return NULL;
<------>t = (struct ext4_dir_entry_tail *)d;
#else
<------>t = EXT4_DIRENT_TAIL(bh->b_data, EXT4_BLOCK_SIZE(inode->i_sb));
#endif
<------>if (t->det_reserved_zero1 ||
<------> le16_to_cpu(t->det_rec_len) != sizeof(struct ext4_dir_entry_tail) ||
<------> t->det_reserved_zero2 ||
<------> t->det_reserved_ft != EXT4_FT_DIR_CSUM)
<------><------>return NULL;
<------>return t;
}
static __le32 ext4_dirblock_csum(struct inode *inode, void *dirent, int size)
{
<------>struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
<------>struct ext4_inode_info *ei = EXT4_I(inode);
<------>__u32 csum;
<------>csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
<------>return cpu_to_le32(csum);
}
#define warn_no_space_for_csum(inode) \
<------>__warn_no_space_for_csum((inode), __func__, __LINE__)
static void __warn_no_space_for_csum(struct inode *inode, const char *func,
<------><------><------><------> unsigned int line)
{
<------>__ext4_warning_inode(inode, func, line,
<------><------>"No space for directory leaf checksum. Please run e2fsck -D.");
}
int ext4_dirblock_csum_verify(struct inode *inode, struct buffer_head *bh)
{
<------>struct ext4_dir_entry_tail *t;
<------>if (!ext4_has_metadata_csum(inode->i_sb))
<------><------>return 1;
<------>t = get_dirent_tail(inode, bh);
<------>if (!t) {
<------><------>warn_no_space_for_csum(inode);
<------><------>return 0;
<------>}
<------>if (t->det_checksum != ext4_dirblock_csum(inode, bh->b_data,
<------><------><------><------><------><------> (char *)t - bh->b_data))
<------><------>return 0;
<------>return 1;
}
static void ext4_dirblock_csum_set(struct inode *inode,
<------><------><------><------> struct buffer_head *bh)
{
<------>struct ext4_dir_entry_tail *t;
<------>if (!ext4_has_metadata_csum(inode->i_sb))
<------><------>return;
<------>t = get_dirent_tail(inode, bh);
<------>if (!t) {
<------><------>warn_no_space_for_csum(inode);
<------><------>return;
<------>}
<------>t->det_checksum = ext4_dirblock_csum(inode, bh->b_data,
<------><------><------><------><------> (char *)t - bh->b_data);
}
int ext4_handle_dirty_dirblock(handle_t *handle,
<------><------><------> struct inode *inode,
<------><------><------> struct buffer_head *bh)
{
<------>ext4_dirblock_csum_set(inode, bh);
<------>return ext4_handle_dirty_metadata(handle, inode, bh);
}
static struct dx_countlimit *get_dx_countlimit(struct inode *inode,
<------><------><------><------><------> struct ext4_dir_entry *dirent,
<------><------><------><------><------> int *offset)
{
<------>struct ext4_dir_entry *dp;
<------>struct dx_root_info *root;
<------>int count_offset;
<------>if (le16_to_cpu(dirent->rec_len) == EXT4_BLOCK_SIZE(inode->i_sb))
<------><------>count_offset = 8;
<------>else if (le16_to_cpu(dirent->rec_len) == 12) {
<------><------>dp = (struct ext4_dir_entry *)(((void *)dirent) + 12);
<------><------>if (le16_to_cpu(dp->rec_len) !=
<------><------> EXT4_BLOCK_SIZE(inode->i_sb) - 12)
<------><------><------>return NULL;
<------><------>root = (struct dx_root_info *)(((void *)dp + 12));
<------><------>if (root->reserved_zero ||
<------><------> root->info_length != sizeof(struct dx_root_info))
<------><------><------>return NULL;
<------><------>count_offset = 32;
<------>} else
<------><------>return NULL;
<------>if (offset)
<------><------>*offset = count_offset;
<------>return (struct dx_countlimit *)(((void *)dirent) + count_offset);
}
static __le32 ext4_dx_csum(struct inode *inode, struct ext4_dir_entry *dirent,
<------><------><------> int count_offset, int count, struct dx_tail *t)
{
<------>struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
<------>struct ext4_inode_info *ei = EXT4_I(inode);
<------>__u32 csum;
<------>int size;
<------>__u32 dummy_csum = 0;
<------>int offset = offsetof(struct dx_tail, dt_checksum);
<------>size = count_offset + (count * sizeof(struct dx_entry));
<------>csum = ext4_chksum(sbi, ei->i_csum_seed, (__u8 *)dirent, size);
<------>csum = ext4_chksum(sbi, csum, (__u8 *)t, offset);
<------>csum = ext4_chksum(sbi, csum, (__u8 *)&dummy_csum, sizeof(dummy_csum));
<------>return cpu_to_le32(csum);
}
static int ext4_dx_csum_verify(struct inode *inode,
<------><------><------> struct ext4_dir_entry *dirent)
{
<------>struct dx_countlimit *c;
<------>struct dx_tail *t;
<------>int count_offset, limit, count;
<------>if (!ext4_has_metadata_csum(inode->i_sb))
<------><------>return 1;
<------>c = get_dx_countlimit(inode, dirent, &count_offset);
<------>if (!c) {
<------><------>EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
<------><------>return 0;
<------>}
<------>limit = le16_to_cpu(c->limit);
<------>count = le16_to_cpu(c->count);
<------>if (count_offset + (limit * sizeof(struct dx_entry)) >
<------> EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
<------><------>warn_no_space_for_csum(inode);
<------><------>return 0;
<------>}
<------>t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
<------>if (t->dt_checksum != ext4_dx_csum(inode, dirent, count_offset,
<------><------><------><------><------> count, t))
<------><------>return 0;
<------>return 1;
}
static void ext4_dx_csum_set(struct inode *inode, struct ext4_dir_entry *dirent)
{
<------>struct dx_countlimit *c;
<------>struct dx_tail *t;
<------>int count_offset, limit, count;
<------>if (!ext4_has_metadata_csum(inode->i_sb))
<------><------>return;
<------>c = get_dx_countlimit(inode, dirent, &count_offset);
<------>if (!c) {
<------><------>EXT4_ERROR_INODE(inode, "dir seems corrupt? Run e2fsck -D.");
<------><------>return;
<------>}
<------>limit = le16_to_cpu(c->limit);
<------>count = le16_to_cpu(c->count);
<------>if (count_offset + (limit * sizeof(struct dx_entry)) >
<------> EXT4_BLOCK_SIZE(inode->i_sb) - sizeof(struct dx_tail)) {
<------><------>warn_no_space_for_csum(inode);
<------><------>return;
<------>}
<------>t = (struct dx_tail *)(((struct dx_entry *)c) + limit);
<------>t->dt_checksum = ext4_dx_csum(inode, dirent, count_offset, count, t);
}
static inline int ext4_handle_dirty_dx_node(handle_t *handle,
<------><------><------><------><------> struct inode *inode,
<------><------><------><------><------> struct buffer_head *bh)
{
<------>ext4_dx_csum_set(inode, (struct ext4_dir_entry *)bh->b_data);
<------>return ext4_handle_dirty_metadata(handle, inode, bh);
}
/*
* p is at least 6 bytes before the end of page
*/
static inline struct ext4_dir_entry_2 *
ext4_next_entry(struct ext4_dir_entry_2 *p, unsigned long blocksize)
{
<------>return (struct ext4_dir_entry_2 *)((char *)p +
<------><------>ext4_rec_len_from_disk(p->rec_len, blocksize));
}
/*
* Future: use high four bits of block for coalesce-on-delete flags
* Mask them off for now.
*/
static inline ext4_lblk_t dx_get_block(struct dx_entry *entry)
{
<------>return le32_to_cpu(entry->block) & 0x0fffffff;
}
static inline void dx_set_block(struct dx_entry *entry, ext4_lblk_t value)
{
<------>entry->block = cpu_to_le32(value);
}
static inline unsigned dx_get_hash(struct dx_entry *entry)
{
<------>return le32_to_cpu(entry->hash);
}
static inline void dx_set_hash(struct dx_entry *entry, unsigned value)
{
<------>entry->hash = cpu_to_le32(value);
}
static inline unsigned dx_get_count(struct dx_entry *entries)
{
<------>return le16_to_cpu(((struct dx_countlimit *) entries)->count);
}
static inline unsigned dx_get_limit(struct dx_entry *entries)
{
<------>return le16_to_cpu(((struct dx_countlimit *) entries)->limit);
}
static inline void dx_set_count(struct dx_entry *entries, unsigned value)
{
<------>((struct dx_countlimit *) entries)->count = cpu_to_le16(value);
}
static inline void dx_set_limit(struct dx_entry *entries, unsigned value)
{
<------>((struct dx_countlimit *) entries)->limit = cpu_to_le16(value);
}
static inline unsigned dx_root_limit(struct inode *dir, unsigned infosize)
{
<------>unsigned int entry_space = dir->i_sb->s_blocksize -
<------><------><------>ext4_dir_rec_len(1, NULL) -
<------><------><------>ext4_dir_rec_len(2, NULL) - infosize;
<------>if (ext4_has_metadata_csum(dir->i_sb))
<------><------>entry_space -= sizeof(struct dx_tail);
<------>return entry_space / sizeof(struct dx_entry);
}
static inline unsigned dx_node_limit(struct inode *dir)
{
<------>unsigned int entry_space = dir->i_sb->s_blocksize -
<------><------><------>ext4_dir_rec_len(0, dir);
<------>if (ext4_has_metadata_csum(dir->i_sb))
<------><------>entry_space -= sizeof(struct dx_tail);
<------>return entry_space / sizeof(struct dx_entry);
}
/*
* Debug
*/
#ifdef DX_DEBUG
static void dx_show_index(char * label, struct dx_entry *entries)
{
<------>int i, n = dx_get_count (entries);
<------>printk(KERN_DEBUG "%s index", label);
<------>for (i = 0; i < n; i++) {
<------><------>printk(KERN_CONT " %x->%lu",
<------><------> i ? dx_get_hash(entries + i) : 0,
<------><------> (unsigned long)dx_get_block(entries + i));
<------>}
<------>printk(KERN_CONT "\n");
}
struct stats
{
<------>unsigned names;
<------>unsigned space;
<------>unsigned bcount;
};
static struct stats dx_show_leaf(struct inode *dir,
<------><------><------><------>struct dx_hash_info *hinfo,
<------><------><------><------>struct ext4_dir_entry_2 *de,
<------><------><------><------>int size, int show_names)
{
<------>unsigned names = 0, space = 0;
<------>char *base = (char *) de;
<------>struct dx_hash_info h = *hinfo;
<------>printk("names: ");
<------>while ((char *) de < base + size)
<------>{
<------><------>if (de->inode)
<------><------>{
<------><------><------>if (show_names)
<------><------><------>{
#ifdef CONFIG_FS_ENCRYPTION
<------><------><------><------>int len;
<------><------><------><------>char *name;
<------><------><------><------>struct fscrypt_str fname_crypto_str =
<------><------><------><------><------>FSTR_INIT(NULL, 0);
<------><------><------><------>int res = 0;
<------><------><------><------>name = de->name;
<------><------><------><------>len = de->name_len;
<------><------><------><------>if (!IS_ENCRYPTED(dir)) {
<------><------><------><------><------>/* Directory is not encrypted */
<------><------><------><------><------>ext4fs_dirhash(dir, de->name,
<------><------><------><------><------><------>de->name_len, &h);
<------><------><------><------><------>printk("%*.s:(U)%x.%u ", len,
<------><------><------><------><------> name, h.hash,
<------><------><------><------><------> (unsigned) ((char *) de
<------><------><------><------><------><------><------> - base));
<------><------><------><------>} else {
<------><------><------><------><------>struct fscrypt_str de_name =
<------><------><------><------><------><------>FSTR_INIT(name, len);
<------><------><------><------><------>/* Directory is encrypted */
<------><------><------><------><------>res = fscrypt_fname_alloc_buffer(
<------><------><------><------><------><------>len, &fname_crypto_str);
<------><------><------><------><------>if (res)
<------><------><------><------><------><------>printk(KERN_WARNING "Error "
<------><------><------><------><------><------><------>"allocating crypto "
<------><------><------><------><------><------><------>"buffer--skipping "
<------><------><------><------><------><------><------>"crypto\n");
<------><------><------><------><------>res = fscrypt_fname_disk_to_usr(dir,
<------><------><------><------><------><------>0, 0, &de_name,
<------><------><------><------><------><------>&fname_crypto_str);
<------><------><------><------><------>if (res) {
<------><------><------><------><------><------>printk(KERN_WARNING "Error "
<------><------><------><------><------><------><------>"converting filename "
<------><------><------><------><------><------><------>"from disk to usr"
<------><------><------><------><------><------><------>"\n");
<------><------><------><------><------><------>name = "??";
<------><------><------><------><------><------>len = 2;
<------><------><------><------><------>} else {
<------><------><------><------><------><------>name = fname_crypto_str.name;
<------><------><------><------><------><------>len = fname_crypto_str.len;
<------><------><------><------><------>}
<------><------><------><------><------>if (IS_CASEFOLDED(dir))
<------><------><------><------><------><------>h.hash = EXT4_DIRENT_HASH(de);
<------><------><------><------><------>else
<------><------><------><------><------><------>ext4fs_dirhash(dir, de->name,
<------><------><------><------><------><------> de->name_len, &h);
<------><------><------><------><------>printk("%*.s:(E)%x.%u ", len, name,
<------><------><------><------><------> h.hash, (unsigned) ((char *) de
<------><------><------><------><------><------><------><------> - base));
<------><------><------><------><------>fscrypt_fname_free_buffer(
<------><------><------><------><------><------><------>&fname_crypto_str);
<------><------><------><------>}
#else
<------><------><------><------>int len = de->name_len;
<------><------><------><------>char *name = de->name;
<------><------><------><------>ext4fs_dirhash(dir, de->name, de->name_len, &h);
<------><------><------><------>printk("%*.s:%x.%u ", len, name, h.hash,
<------><------><------><------> (unsigned) ((char *) de - base));
#endif
<------><------><------>}
<------><------><------>space += ext4_dir_rec_len(de->name_len, dir);
<------><------><------>names++;
<------><------>}
<------><------>de = ext4_next_entry(de, size);
<------>}
<------>printk(KERN_CONT "(%i)\n", names);
<------>return (struct stats) { names, space, 1 };
}
struct stats dx_show_entries(struct dx_hash_info *hinfo, struct inode *dir,
<------><------><------> struct dx_entry *entries, int levels)
{
<------>unsigned blocksize = dir->i_sb->s_blocksize;
<------>unsigned count = dx_get_count(entries), names = 0, space = 0, i;
<------>unsigned bcount = 0;
<------>struct buffer_head *bh;
<------>printk("%i indexed blocks...\n", count);
<------>for (i = 0; i < count; i++, entries++)
<------>{
<------><------>ext4_lblk_t block = dx_get_block(entries);
<------><------>ext4_lblk_t hash = i ? dx_get_hash(entries): 0;
<------><------>u32 range = i < count - 1? (dx_get_hash(entries + 1) - hash): ~hash;
<------><------>struct stats stats;
<------><------>printk("%s%3u:%03u hash %8x/%8x ",levels?"":" ", i, block, hash, range);
<------><------>bh = ext4_bread(NULL,dir, block, 0);
<------><------>if (!bh || IS_ERR(bh))
<------><------><------>continue;
<------><------>stats = levels?
<------><------> dx_show_entries(hinfo, dir, ((struct dx_node *) bh->b_data)->entries, levels - 1):
<------><------> dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *)
<------><------><------>bh->b_data, blocksize, 0);
<------><------>names += stats.names;
<------><------>space += stats.space;
<------><------>bcount += stats.bcount;
<------><------>brelse(bh);
<------>}
<------>if (bcount)
<------><------>printk(KERN_DEBUG "%snames %u, fullness %u (%u%%)\n",
<------><------> levels ? "" : " ", names, space/bcount,
<------><------> (space/bcount)*100/blocksize);
<------>return (struct stats) { names, space, bcount};
}
#endif /* DX_DEBUG */
/*
* Probe for a directory leaf block to search.
*
* dx_probe can return ERR_BAD_DX_DIR, which means there was a format
* error in the directory index, and the caller should fall back to
* searching the directory normally. The callers of dx_probe **MUST**
* check for this error code, and make sure it never gets reflected
* back to userspace.
*/
static struct dx_frame *
dx_probe(struct ext4_filename *fname, struct inode *dir,
<------> struct dx_hash_info *hinfo, struct dx_frame *frame_in)
{
<------>unsigned count, indirect;
<------>struct dx_entry *at, *entries, *p, *q, *m;
<------>struct dx_root *root;
<------>struct dx_frame *frame = frame_in;
<------>struct dx_frame *ret_err = ERR_PTR(ERR_BAD_DX_DIR);
<------>u32 hash;
<------>memset(frame_in, 0, EXT4_HTREE_LEVEL * sizeof(frame_in[0]));
<------>frame->bh = ext4_read_dirblock(dir, 0, INDEX);
<------>if (IS_ERR(frame->bh))
<------><------>return (struct dx_frame *) frame->bh;
<------>root = (struct dx_root *) frame->bh->b_data;
<------>if (root->info.hash_version != DX_HASH_TEA &&
<------> root->info.hash_version != DX_HASH_HALF_MD4 &&
<------> root->info.hash_version != DX_HASH_LEGACY &&
<------> root->info.hash_version != DX_HASH_SIPHASH) {
<------><------>ext4_warning_inode(dir, "Unrecognised inode hash code %u",
<------><------><------><------> root->info.hash_version);
<------><------>goto fail;
<------>}
<------>if (ext4_hash_in_dirent(dir)) {
<------><------>if (root->info.hash_version != DX_HASH_SIPHASH) {
<------><------><------>ext4_warning_inode(dir,
<------><------><------><------>"Hash in dirent, but hash is not SIPHASH");
<------><------><------>goto fail;
<------><------>}
<------>} else {
<------><------>if (root->info.hash_version == DX_HASH_SIPHASH) {
<------><------><------>ext4_warning_inode(dir,
<------><------><------><------>"Hash code is SIPHASH, but hash not in dirent");
<------><------><------>goto fail;
<------><------>}
<------>}
<------>if (fname)
<------><------>hinfo = &fname->hinfo;
<------>hinfo->hash_version = root->info.hash_version;
<------>if (hinfo->hash_version <= DX_HASH_TEA)
<------><------>hinfo->hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
<------>hinfo->seed = EXT4_SB(dir->i_sb)->s_hash_seed;
<------>/* hash is already computed for encrypted casefolded directory */
<------>if (fname && fname_name(fname) &&
<------><------><------><------>!(IS_ENCRYPTED(dir) && IS_CASEFOLDED(dir)))
<------><------>ext4fs_dirhash(dir, fname_name(fname), fname_len(fname), hinfo);
<------>hash = hinfo->hash;
<------>if (root->info.unused_flags & 1) {
<------><------>ext4_warning_inode(dir, "Unimplemented hash flags: %#06x",
<------><------><------><------> root->info.unused_flags);
<------><------>goto fail;
<------>}
<------>indirect = root->info.indirect_levels;
<------>if (indirect >= ext4_dir_htree_level(dir->i_sb)) {
<------><------>ext4_warning(dir->i_sb,
<------><------><------> "Directory (ino: %lu) htree depth %#06x exceed"
<------><------><------> "supported value", dir->i_ino,
<------><------><------> ext4_dir_htree_level(dir->i_sb));
<------><------>if (ext4_dir_htree_level(dir->i_sb) < EXT4_HTREE_LEVEL) {
<------><------><------>ext4_warning(dir->i_sb, "Enable large directory "
<------><------><------><------><------><------>"feature to access it");
<------><------>}
<------><------>goto fail;
<------>}
<------>entries = (struct dx_entry *)(((char *)&root->info) +
<------><------><------><------> root->info.info_length);
<------>if (dx_get_limit(entries) != dx_root_limit(dir,
<------><------><------><------><------><------> root->info.info_length)) {
<------><------>ext4_warning_inode(dir, "dx entry: limit %u != root limit %u",
<------><------><------><------> dx_get_limit(entries),
<------><------><------><------> dx_root_limit(dir, root->info.info_length));
<------><------>goto fail;
<------>}
<------>dxtrace(printk("Look up %x", hash));
<------>while (1) {
<------><------>count = dx_get_count(entries);
<------><------>if (!count || count > dx_get_limit(entries)) {
<------><------><------>ext4_warning_inode(dir,
<------><------><------><------><------> "dx entry: count %u beyond limit %u",
<------><------><------><------><------> count, dx_get_limit(entries));
<------><------><------>goto fail;
<------><------>}
<------><------>p = entries + 1;
<------><------>q = entries + count - 1;
<------><------>while (p <= q) {
<------><------><------>m = p + (q - p) / 2;
<------><------><------>dxtrace(printk(KERN_CONT "."));
<------><------><------>if (dx_get_hash(m) > hash)
<------><------><------><------>q = m - 1;
<------><------><------>else
<------><------><------><------>p = m + 1;
<------><------>}
<------><------>if (0) { // linear search cross check
<------><------><------>unsigned n = count - 1;
<------><------><------>at = entries;
<------><------><------>while (n--)
<------><------><------>{
<------><------><------><------>dxtrace(printk(KERN_CONT ","));
<------><------><------><------>if (dx_get_hash(++at) > hash)
<------><------><------><------>{
<------><------><------><------><------>at--;
<------><------><------><------><------>break;
<------><------><------><------>}
<------><------><------>}
<------><------><------>assert (at == p - 1);
<------><------>}
<------><------>at = p - 1;
<------><------>dxtrace(printk(KERN_CONT " %x->%u\n",
<------><------><------> at == entries ? 0 : dx_get_hash(at),
<------><------><------> dx_get_block(at)));
<------><------>frame->entries = entries;
<------><------>frame->at = at;
<------><------>if (!indirect--)
<------><------><------>return frame;
<------><------>frame++;
<------><------>frame->bh = ext4_read_dirblock(dir, dx_get_block(at), INDEX);
<------><------>if (IS_ERR(frame->bh)) {
<------><------><------>ret_err = (struct dx_frame *) frame->bh;
<------><------><------>frame->bh = NULL;
<------><------><------>goto fail;
<------><------>}
<------><------>entries = ((struct dx_node *) frame->bh->b_data)->entries;
<------><------>if (dx_get_limit(entries) != dx_node_limit(dir)) {
<------><------><------>ext4_warning_inode(dir,
<------><------><------><------>"dx entry: limit %u != node limit %u",
<------><------><------><------>dx_get_limit(entries), dx_node_limit(dir));
<------><------><------>goto fail;
<------><------>}
<------>}
fail:
<------>while (frame >= frame_in) {
<------><------>brelse(frame->bh);
<------><------>frame--;
<------>}
<------>if (ret_err == ERR_PTR(ERR_BAD_DX_DIR))
<------><------>ext4_warning_inode(dir,
<------><------><------>"Corrupt directory, running e2fsck is recommended");
<------>return ret_err;
}
static void dx_release(struct dx_frame *frames)
{
<------>struct dx_root_info *info;
<------>int i;
<------>unsigned int indirect_levels;
<------>if (frames[0].bh == NULL)
<------><------>return;
<------>info = &((struct dx_root *)frames[0].bh->b_data)->info;
<------>/* save local copy, "info" may be freed after brelse() */
<------>indirect_levels = info->indirect_levels;
<------>for (i = 0; i <= indirect_levels; i++) {
<------><------>if (frames[i].bh == NULL)
<------><------><------>break;
<------><------>brelse(frames[i].bh);
<------><------>frames[i].bh = NULL;
<------>}
}
/*
* This function increments the frame pointer to search the next leaf
* block, and reads in the necessary intervening nodes if the search
* should be necessary. Whether or not the search is necessary is
* controlled by the hash parameter. If the hash value is even, then
* the search is only continued if the next block starts with that
* hash value. This is used if we are searching for a specific file.
*
* If the hash value is HASH_NB_ALWAYS, then always go to the next block.
*
* This function returns 1 if the caller should continue to search,
* or 0 if it should not. If there is an error reading one of the
* index blocks, it will a negative error code.
*
* If start_hash is non-null, it will be filled in with the starting
* hash of the next page.
*/
static int ext4_htree_next_block(struct inode *dir, __u32 hash,
<------><------><------><------> struct dx_frame *frame,
<------><------><------><------> struct dx_frame *frames,
<------><------><------><------> __u32 *start_hash)
{
<------>struct dx_frame *p;
<------>struct buffer_head *bh;
<------>int num_frames = 0;
<------>__u32 bhash;
<------>p = frame;
<------>/*
<------> * Find the next leaf page by incrementing the frame pointer.
<------> * If we run out of entries in the interior node, loop around and
<------> * increment pointer in the parent node. When we break out of
<------> * this loop, num_frames indicates the number of interior
<------> * nodes need to be read.
<------> */
<------>while (1) {
<------><------>if (++(p->at) < p->entries + dx_get_count(p->entries))
<------><------><------>break;
<------><------>if (p == frames)
<------><------><------>return 0;
<------><------>num_frames++;
<------><------>p--;
<------>}
<------>/*
<------> * If the hash is 1, then continue only if the next page has a
<------> * continuation hash of any value. This is used for readdir
<------> * handling. Otherwise, check to see if the hash matches the
<------> * desired contiuation hash. If it doesn't, return since
<------> * there's no point to read in the successive index pages.
<------> */
<------>bhash = dx_get_hash(p->at);
<------>if (start_hash)
<------><------>*start_hash = bhash;
<------>if ((hash & 1) == 0) {
<------><------>if ((bhash & ~1) != hash)
<------><------><------>return 0;
<------>}
<------>/*
<------> * If the hash is HASH_NB_ALWAYS, we always go to the next
<------> * block so no check is necessary
<------> */
<------>while (num_frames--) {
<------><------>bh = ext4_read_dirblock(dir, dx_get_block(p->at), INDEX);
<------><------>if (IS_ERR(bh))
<------><------><------>return PTR_ERR(bh);
<------><------>p++;
<------><------>brelse(p->bh);
<------><------>p->bh = bh;
<------><------>p->at = p->entries = ((struct dx_node *) bh->b_data)->entries;
<------>}
<------>return 1;
}
/*
* This function fills a red-black tree with information from a
* directory block. It returns the number directory entries loaded
* into the tree. If there is an error it is returned in err.
*/
static int htree_dirblock_to_tree(struct file *dir_file,
<------><------><------><------> struct inode *dir, ext4_lblk_t block,
<------><------><------><------> struct dx_hash_info *hinfo,
<------><------><------><------> __u32 start_hash, __u32 start_minor_hash)
{
<------>struct buffer_head *bh;
<------>struct ext4_dir_entry_2 *de, *top;
<------>int err = 0, count = 0;
<------>struct fscrypt_str fname_crypto_str = FSTR_INIT(NULL, 0), tmp_str;
<------>int csum = ext4_has_metadata_csum(dir->i_sb);
<------>dxtrace(printk(KERN_INFO "In htree dirblock_to_tree: block %lu\n",
<------><------><------><------><------><------><------>(unsigned long)block));
<------>bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
<------>if (IS_ERR(bh))
<------><------>return PTR_ERR(bh);
<------>de = (struct ext4_dir_entry_2 *) bh->b_data;
<------>/* csum entries are not larger in the casefolded encrypted case */
<------>top = (struct ext4_dir_entry_2 *) ((char *) de +
<------><------><------><------><------> dir->i_sb->s_blocksize -
<------><------><------><------><------> ext4_dir_rec_len(0,
<------><------><------><------><------><------><------> csum ? NULL : dir));
<------>/* Check if the directory is encrypted */
<------>if (IS_ENCRYPTED(dir)) {
<------><------>err = fscrypt_prepare_readdir(dir);
<------><------>if (err < 0) {
<------><------><------>brelse(bh);
<------><------><------>return err;
<------><------>}
<------><------>err = fscrypt_fname_alloc_buffer(EXT4_NAME_LEN,
<------><------><------><------><------><------> &fname_crypto_str);
<------><------>if (err < 0) {
<------><------><------>brelse(bh);
<------><------><------>return err;
<------><------>}
<------>}
<------>for (; de < top; de = ext4_next_entry(de, dir->i_sb->s_blocksize)) {
<------><------>if (ext4_check_dir_entry(dir, NULL, de, bh,
<------><------><------><------>bh->b_data, bh->b_size, block,
<------><------><------><------>(block<<EXT4_BLOCK_SIZE_BITS(dir->i_sb))
<------><------><------><------><------> + ((char *)de - bh->b_data))) {
<------><------><------>/* silently ignore the rest of the block */
<------><------><------>break;
<------><------>}
<------><------>if (ext4_hash_in_dirent(dir)) {
<------><------><------>if (de->name_len && de->inode) {
<------><------><------><------>hinfo->hash = EXT4_DIRENT_HASH(de);
<------><------><------><------>hinfo->minor_hash = EXT4_DIRENT_MINOR_HASH(de);
<------><------><------>} else {
<------><------><------><------>hinfo->hash = 0;
<------><------><------><------>hinfo->minor_hash = 0;
<------><------><------>}
<------><------>} else {
<------><------><------>ext4fs_dirhash(dir, de->name, de->name_len, hinfo);
<------><------>}
<------><------>if ((hinfo->hash < start_hash) ||
<------><------> ((hinfo->hash == start_hash) &&
<------><------> (hinfo->minor_hash < start_minor_hash)))
<------><------><------>continue;
<------><------>if (de->inode == 0)
<------><------><------>continue;
<------><------>if (!IS_ENCRYPTED(dir)) {
<------><------><------>tmp_str.name = de->name;
<------><------><------>tmp_str.len = de->name_len;
<------><------><------>err = ext4_htree_store_dirent(dir_file,
<------><------><------><------> hinfo->hash, hinfo->minor_hash, de,
<------><------><------><------> &tmp_str);
<------><------>} else {
<------><------><------>int save_len = fname_crypto_str.len;
<------><------><------>struct fscrypt_str de_name = FSTR_INIT(de->name,
<------><------><------><------><------><------><------><------>de->name_len);
<------><------><------>/* Directory is encrypted */
<------><------><------>err = fscrypt_fname_disk_to_usr(dir, hinfo->hash,
<------><------><------><------><------>hinfo->minor_hash, &de_name,
<------><------><------><------><------>&fname_crypto_str);
<------><------><------>if (err) {
<------><------><------><------>count = err;
<------><------><------><------>goto errout;
<------><------><------>}
<------><------><------>err = ext4_htree_store_dirent(dir_file,
<------><------><------><------> hinfo->hash, hinfo->minor_hash, de,
<------><------><------><------><------>&fname_crypto_str);
<------><------><------>fname_crypto_str.len = save_len;
<------><------>}
<------><------>if (err != 0) {
<------><------><------>count = err;
<------><------><------>goto errout;
<------><------>}
<------><------>count++;
<------>}
errout:
<------>brelse(bh);
<------>fscrypt_fname_free_buffer(&fname_crypto_str);
<------>return count;
}
/*
* This function fills a red-black tree with information from a
* directory. We start scanning the directory in hash order, starting
* at start_hash and start_minor_hash.
*
* This function returns the number of entries inserted into the tree,
* or a negative error code.
*/
int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
<------><------><------> __u32 start_minor_hash, __u32 *next_hash)
{
<------>struct dx_hash_info hinfo;
<------>struct ext4_dir_entry_2 *de;
<------>struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
<------>struct inode *dir;
<------>ext4_lblk_t block;
<------>int count = 0;
<------>int ret, err;
<------>__u32 hashval;
<------>struct fscrypt_str tmp_str;
<------>dxtrace(printk(KERN_DEBUG "In htree_fill_tree, start hash: %x:%x\n",
<------><------> start_hash, start_minor_hash));
<------>dir = file_inode(dir_file);
<------>if (!(ext4_test_inode_flag(dir, EXT4_INODE_INDEX))) {
<------><------>if (ext4_hash_in_dirent(dir))
<------><------><------>hinfo.hash_version = DX_HASH_SIPHASH;
<------><------>else
<------><------><------>hinfo.hash_version =
<------><------><------><------><------>EXT4_SB(dir->i_sb)->s_def_hash_version;
<------><------>if (hinfo.hash_version <= DX_HASH_TEA)
<------><------><------>hinfo.hash_version +=
<------><------><------><------>EXT4_SB(dir->i_sb)->s_hash_unsigned;
<------><------>hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
<------><------>if (ext4_has_inline_data(dir)) {
<------><------><------>int has_inline_data = 1;
<------><------><------>count = ext4_inlinedir_to_tree(dir_file, dir, 0,
<------><------><------><------><------><------> &hinfo, start_hash,
<------><------><------><------><------><------> start_minor_hash,
<------><------><------><------><------><------> &has_inline_data);
<------><------><------>if (has_inline_data) {
<------><------><------><------>*next_hash = ~0;
<------><------><------><------>return count;
<------><------><------>}
<------><------>}
<------><------>count = htree_dirblock_to_tree(dir_file, dir, 0, &hinfo,
<------><------><------><------><------> start_hash, start_minor_hash);
<------><------>*next_hash = ~0;
<------><------>return count;
<------>}
<------>hinfo.hash = start_hash;
<------>hinfo.minor_hash = 0;
<------>frame = dx_probe(NULL, dir, &hinfo, frames);
<------>if (IS_ERR(frame))
<------><------>return PTR_ERR(frame);
<------>/* Add '.' and '..' from the htree header */
<------>if (!start_hash && !start_minor_hash) {
<------><------>de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
<------><------>tmp_str.name = de->name;
<------><------>tmp_str.len = de->name_len;
<------><------>err = ext4_htree_store_dirent(dir_file, 0, 0,
<------><------><------><------><------> de, &tmp_str);
<------><------>if (err != 0)
<------><------><------>goto errout;
<------><------>count++;
<------>}
<------>if (start_hash < 2 || (start_hash ==2 && start_minor_hash==0)) {
<------><------>de = (struct ext4_dir_entry_2 *) frames[0].bh->b_data;
<------><------>de = ext4_next_entry(de, dir->i_sb->s_blocksize);
<------><------>tmp_str.name = de->name;
<------><------>tmp_str.len = de->name_len;
<------><------>err = ext4_htree_store_dirent(dir_file, 2, 0,
<------><------><------><------><------> de, &tmp_str);
<------><------>if (err != 0)
<------><------><------>goto errout;
<------><------>count++;
<------>}
<------>while (1) {
<------><------>if (fatal_signal_pending(current)) {
<------><------><------>err = -ERESTARTSYS;
<------><------><------>goto errout;
<------><------>}
<------><------>cond_resched();
<------><------>block = dx_get_block(frame->at);
<------><------>ret = htree_dirblock_to_tree(dir_file, dir, block, &hinfo,
<------><------><------><------><------> start_hash, start_minor_hash);
<------><------>if (ret < 0) {
<------><------><------>err = ret;
<------><------><------>goto errout;
<------><------>}
<------><------>count += ret;
<------><------>hashval = ~0;
<------><------>ret = ext4_htree_next_block(dir, HASH_NB_ALWAYS,
<------><------><------><------><------> frame, frames, &hashval);
<------><------>*next_hash = hashval;
<------><------>if (ret < 0) {
<------><------><------>err = ret;
<------><------><------>goto errout;
<------><------>}
<------><------>/*
<------><------> * Stop if: (a) there are no more entries, or
<------><------> * (b) we have inserted at least one entry and the
<------><------> * next hash value is not a continuation
<------><------> */
<------><------>if ((ret == 0) ||
<------><------> (count && ((hashval & 1) == 0)))
<------><------><------>break;
<------>}
<------>dx_release(frames);
<------>dxtrace(printk(KERN_DEBUG "Fill tree: returned %d entries, "
<------><------> "next hash: %x\n", count, *next_hash));
<------>return count;
errout:
<------>dx_release(frames);
<------>return (err);
}
static inline int search_dirblock(struct buffer_head *bh,
<------><------><------><------> struct inode *dir,
<------><------><------><------> struct ext4_filename *fname,
<------><------><------><------> ext4_lblk_t lblk,
<------><------><------><------> unsigned int offset,
<------><------><------><------> struct ext4_dir_entry_2 **res_dir)
{
<------>return ext4_search_dir(bh, bh->b_data, dir->i_sb->s_blocksize, dir,
<------><------><------> fname, lblk, offset, res_dir);
}
/*
* Directory block splitting, compacting
*/
/*
* Create map of hash values, offsets, and sizes, stored at end of block.
* Returns number of entries mapped.
*/
static int dx_make_map(struct inode *dir, struct ext4_dir_entry_2 *de,
<------><------> unsigned blocksize, struct dx_hash_info *hinfo,
<------><------> struct dx_map_entry *map_tail)
{
<------>int count = 0;
<------>char *base = (char *) de;
<------>struct dx_hash_info h = *hinfo;
<------>while ((char *) de < base + blocksize) {
<------><------>if (de->name_len && de->inode) {
<------><------><------>if (ext4_hash_in_dirent(dir))
<------><------><------><------>h.hash = EXT4_DIRENT_HASH(de);
<------><------><------>else
<------><------><------><------>ext4fs_dirhash(dir, de->name, de->name_len, &h);
<------><------><------>map_tail--;
<------><------><------>map_tail->hash = h.hash;
<------><------><------>map_tail->offs = ((char *) de - base)>>2;
<------><------><------>map_tail->size = le16_to_cpu(de->rec_len);
<------><------><------>count++;
<------><------><------>cond_resched();
<------><------>}
<------><------>/* XXX: do we need to check rec_len == 0 case? -Chris */
<------><------>de = ext4_next_entry(de, blocksize);
<------>}
<------>return count;
}
/* Sort map by hash value */
static void dx_sort_map (struct dx_map_entry *map, unsigned count)
{
<------>struct dx_map_entry *p, *q, *top = map + count - 1;
<------>int more;
<------>/* Combsort until bubble sort doesn't suck */
<------>while (count > 2) {
<------><------>count = count*10/13;
<------><------>if (count - 9 < 2) /* 9, 10 -> 11 */
<------><------><------>count = 11;
<------><------>for (p = top, q = p - count; q >= map; p--, q--)
<------><------><------>if (p->hash < q->hash)
<------><------><------><------>swap(*p, *q);
<------>}
<------>/* Garden variety bubble sort */
<------>do {
<------><------>more = 0;
<------><------>q = top;
<------><------>while (q-- > map) {
<------><------><------>if (q[1].hash >= q[0].hash)
<------><------><------><------>continue;
<------><------><------>swap(*(q+1), *q);
<------><------><------>more = 1;
<------><------>}
<------>} while(more);
}
static void dx_insert_block(struct dx_frame *frame, u32 hash, ext4_lblk_t block)
{
<------>struct dx_entry *entries = frame->entries;
<------>struct dx_entry *old = frame->at, *new = old + 1;
<------>int count = dx_get_count(entries);
<------>assert(count < dx_get_limit(entries));
<------>assert(old < entries + count);
<------>memmove(new + 1, new, (char *)(entries + count) - (char *)(new));
<------>dx_set_hash(new, hash);
<------>dx_set_block(new, block);
<------>dx_set_count(entries, count + 1);
}
#ifdef CONFIG_UNICODE
/*
* Test whether a case-insensitive directory entry matches the filename
* being searched for. If quick is set, assume the name being looked up
* is already in the casefolded form.
*
* Returns: 0 if the directory entry matches, more than 0 if it
* doesn't match or less than zero on error.
*/
static int ext4_ci_compare(const struct inode *parent, const struct qstr *name,
<------><------><------> u8 *de_name, size_t de_name_len, bool quick)
{
<------>const struct super_block *sb = parent->i_sb;
<------>const struct unicode_map *um = sb->s_encoding;
<------>struct fscrypt_str decrypted_name = FSTR_INIT(NULL, de_name_len);
<------>struct qstr entry = QSTR_INIT(de_name, de_name_len);
<------>int ret;
<------>if (IS_ENCRYPTED(parent)) {
<------><------>const struct fscrypt_str encrypted_name =
<------><------><------><------>FSTR_INIT(de_name, de_name_len);
<------><------>decrypted_name.name = kmalloc(de_name_len, GFP_KERNEL);
<------><------>if (!decrypted_name.name)
<------><------><------>return -ENOMEM;
<------><------>ret = fscrypt_fname_disk_to_usr(parent, 0, 0, &encrypted_name,
<------><------><------><------><------><------>&decrypted_name);
<------><------>if (ret < 0)
<------><------><------>goto out;
<------><------>entry.name = decrypted_name.name;
<------><------>entry.len = decrypted_name.len;
<------>}
<------>if (quick)
<------><------>ret = utf8_strncasecmp_folded(um, name, &entry);
<------>else
<------><------>ret = utf8_strncasecmp(um, name, &entry);
<------>if (ret < 0) {
<------><------>/* Handle invalid character sequence as either an error
<------><------> * or as an opaque byte sequence.
<------><------> */
<------><------>if (sb_has_strict_encoding(sb))
<------><------><------>ret = -EINVAL;
<------><------>else if (name->len != entry.len)
<------><------><------>ret = 1;
<------><------>else
<------><------><------>ret = !!memcmp(name->name, entry.name, entry.len);
<------>}
out:
<------>kfree(decrypted_name.name);
<------>return ret;
}
int ext4_fname_setup_ci_filename(struct inode *dir, const struct qstr *iname,
<------><------><------><------> struct ext4_filename *name)
{
<------>struct fscrypt_str *cf_name = &name->cf_name;
<------>struct dx_hash_info *hinfo = &name->hinfo;
<------>int len;
<------>if (!IS_CASEFOLDED(dir) || !dir->i_sb->s_encoding ||
<------> (IS_ENCRYPTED(dir) && !fscrypt_has_encryption_key(dir))) {
<------><------>cf_name->name = NULL;
<------><------>return 0;
<------>}
<------>cf_name->name = kmalloc(EXT4_NAME_LEN, GFP_NOFS);
<------>if (!cf_name->name)
<------><------>return -ENOMEM;
<------>len = utf8_casefold(dir->i_sb->s_encoding,
<------><------><------> iname, cf_name->name,
<------><------><------> EXT4_NAME_LEN);
<------>if (len <= 0) {
<------><------>kfree(cf_name->name);
<------><------>cf_name->name = NULL;
<------>}
<------>cf_name->len = (unsigned) len;
<------>if (!IS_ENCRYPTED(dir))
<------><------>return 0;
<------>hinfo->hash_version = DX_HASH_SIPHASH;
<------>hinfo->seed = NULL;
<------>if (cf_name->name)
<------><------>ext4fs_dirhash(dir, cf_name->name, cf_name->len, hinfo);
<------>else
<------><------>ext4fs_dirhash(dir, iname->name, iname->len, hinfo);
<------>return 0;
}
#endif
/*
* Test whether a directory entry matches the filename being searched for.
*
* Return: %true if the directory entry matches, otherwise %false.
*/
static bool ext4_match(struct inode *parent,
<------><------><------> const struct ext4_filename *fname,
<------><------><------> struct ext4_dir_entry_2 *de)
{
<------>struct fscrypt_name f;
<------>if (!de->inode)
<------><------>return false;
<------>f.usr_fname = fname->usr_fname;
<------>f.disk_name = fname->disk_name;
#ifdef CONFIG_FS_ENCRYPTION
<------>f.crypto_buf = fname->crypto_buf;
#endif
#ifdef CONFIG_UNICODE
<------>if (parent->i_sb->s_encoding && IS_CASEFOLDED(parent) &&
<------> (!IS_ENCRYPTED(parent) || fscrypt_has_encryption_key(parent))) {
<------><------>if (fname->cf_name.name) {
<------><------><------>struct qstr cf = {.name = fname->cf_name.name,
<------><------><------><------><------> .len = fname->cf_name.len};
<------><------><------>if (IS_ENCRYPTED(parent)) {
<------><------><------><------>if (fname->hinfo.hash != EXT4_DIRENT_HASH(de) ||
<------><------><------><------><------>fname->hinfo.minor_hash !=
<------><------><------><------><------><------>EXT4_DIRENT_MINOR_HASH(de)) {
<------><------><------><------><------>return 0;
<------><------><------><------>}
<------><------><------>}
<------><------><------>return !ext4_ci_compare(parent, &cf, de->name,
<------><------><------><------><------><------><------>de->name_len, true);
<------><------>}
<------><------>return !ext4_ci_compare(parent, fname->usr_fname, de->name,
<------><------><------><------><------><------>de->name_len, false);
<------>}
#endif
<------>return fscrypt_match_name(&f, de->name, de->name_len);
}
/*
* Returns 0 if not found, -1 on failure, and 1 on success
*/
int ext4_search_dir(struct buffer_head *bh, char *search_buf, int buf_size,
<------><------> struct inode *dir, struct ext4_filename *fname,
<------><------> ext4_lblk_t lblk, unsigned int offset,
<------><------> struct ext4_dir_entry_2 **res_dir)
{
<------>struct ext4_dir_entry_2 * de;
<------>char * dlimit;
<------>int de_len;
<------>de = (struct ext4_dir_entry_2 *)search_buf;
<------>dlimit = search_buf + buf_size;
<------>while ((char *) de < dlimit) {
<------><------>/* this code is executed quadratically often */
<------><------>/* do minimal checking `by hand' */
<------><------>if ((char *) de + de->name_len <= dlimit &&
<------><------> ext4_match(dir, fname, de)) {
<------><------><------>/* found a match - just to be sure, do
<------><------><------> * a full check */
<------><------><------>if (ext4_check_dir_entry(dir, NULL, de, bh, search_buf,
<------><------><------><------><------><------> buf_size, lblk, offset))
<------><------><------><------>return -1;
<------><------><------>*res_dir = de;
<------><------><------>return 1;
<------><------>}
<------><------>/* prevent looping on a bad block */
<------><------>de_len = ext4_rec_len_from_disk(de->rec_len,
<------><------><------><------><------><------>dir->i_sb->s_blocksize);
<------><------>if (de_len <= 0)
<------><------><------>return -1;
<------><------>offset += de_len;
<------><------>de = (struct ext4_dir_entry_2 *) ((char *) de + de_len);
<------>}
<------>return 0;
}
static int is_dx_internal_node(struct inode *dir, ext4_lblk_t block,
<------><------><------> struct ext4_dir_entry *de)
{
<------>struct super_block *sb = dir->i_sb;
<------>if (!is_dx(dir))
<------><------>return 0;
<------>if (block == 0)
<------><------>return 1;
<------>if (de->inode == 0 &&
<------> ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize) ==
<------><------><------>sb->s_blocksize)
<------><------>return 1;
<------>return 0;
}
/*
* __ext4_find_entry()
*
* finds an entry in the specified directory with the wanted name. It
* returns the cache buffer in which the entry was found, and the entry
* itself (as a parameter - res_dir). It does NOT read the inode of the
* entry - you'll have to do that yourself if you want to.
*
* The returned buffer_head has ->b_count elevated. The caller is expected
* to brelse() it when appropriate.
*/
static struct buffer_head *__ext4_find_entry(struct inode *dir,
<------><------><------><------><------> struct ext4_filename *fname,
<------><------><------><------><------> struct ext4_dir_entry_2 **res_dir,
<------><------><------><------><------> int *inlined, ext4_lblk_t *lblk)
{
<------>struct super_block *sb;
<------>struct buffer_head *bh_use[NAMEI_RA_SIZE];
<------>struct buffer_head *bh, *ret = NULL;
<------>ext4_lblk_t start, block;
<------>const u8 *name = fname->usr_fname->name;
<------>size_t ra_max = 0; /* Number of bh's in the readahead
<------><------><------><------> buffer, bh_use[] */
<------>size_t ra_ptr = 0; /* Current index into readahead
<------><------><------><------> buffer */
<------>ext4_lblk_t nblocks;
<------>int i, namelen, retval;
<------>*res_dir = NULL;
<------>sb = dir->i_sb;
<------>namelen = fname->usr_fname->len;
<------>if (namelen > EXT4_NAME_LEN)
<------><------>return NULL;
<------>if (ext4_has_inline_data(dir)) {
<------><------>int has_inline_data = 1;
<------><------>ret = ext4_find_inline_entry(dir, fname, res_dir,
<------><------><------><------><------> &has_inline_data);
<------><------>if (lblk)
<------><------><------>*lblk = 0;
<------><------>if (has_inline_data) {
<------><------><------>if (inlined)
<------><------><------><------>*inlined = 1;
<------><------><------>goto cleanup_and_exit;
<------><------>}
<------>}
<------>if ((namelen <= 2) && (name[0] == '.') &&
<------> (name[1] == '.' || name[1] == '\0')) {
<------><------>/*
<------><------> * "." or ".." will only be in the first block
<------><------> * NFS may look up ".."; "." should be handled by the VFS
<------><------> */
<------><------>block = start = 0;
<------><------>nblocks = 1;
<------><------>goto restart;
<------>}
<------>if (is_dx(dir)) {
<------><------>ret = ext4_dx_find_entry(dir, fname, res_dir, lblk);
<------><------>/*
<------><------> * On success, or if the error was file not found,
<------><------> * return. Otherwise, fall back to doing a search the
<------><------> * old fashioned way.
<------><------> */
<------><------>if (!IS_ERR(ret) || PTR_ERR(ret) != ERR_BAD_DX_DIR)
<------><------><------>goto cleanup_and_exit;
<------><------>dxtrace(printk(KERN_DEBUG "ext4_find_entry: dx failed, "
<------><------><------> "falling back\n"));
<------><------>ret = NULL;
<------>}
<------>nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
<------>if (!nblocks) {
<------><------>ret = NULL;
<------><------>goto cleanup_and_exit;
<------>}
<------>start = EXT4_I(dir)->i_dir_start_lookup;
<------>if (start >= nblocks)
<------><------>start = 0;
<------>block = start;
restart:
<------>do {
<------><------>/*
<------><------> * We deal with the read-ahead logic here.
<------><------> */
<------><------>cond_resched();
<------><------>if (ra_ptr >= ra_max) {
<------><------><------>/* Refill the readahead buffer */
<------><------><------>ra_ptr = 0;
<------><------><------>if (block < start)
<------><------><------><------>ra_max = start - block;
<------><------><------>else
<------><------><------><------>ra_max = nblocks - block;
<------><------><------>ra_max = min(ra_max, ARRAY_SIZE(bh_use));
<------><------><------>retval = ext4_bread_batch(dir, block, ra_max,
<------><------><------><------><------><------> false /* wait */, bh_use);
<------><------><------>if (retval) {
<------><------><------><------>ret = ERR_PTR(retval);
<------><------><------><------>ra_max = 0;
<------><------><------><------>goto cleanup_and_exit;
<------><------><------>}
<------><------>}
<------><------>if ((bh = bh_use[ra_ptr++]) == NULL)
<------><------><------>goto next;
<------><------>wait_on_buffer(bh);
<------><------>if (!buffer_uptodate(bh)) {
<------><------><------>EXT4_ERROR_INODE_ERR(dir, EIO,
<------><------><------><------><------> "reading directory lblock %lu",
<------><------><------><------><------> (unsigned long) block);
<------><------><------>brelse(bh);
<------><------><------>ret = ERR_PTR(-EIO);
<------><------><------>goto cleanup_and_exit;
<------><------>}
<------><------>if (!buffer_verified(bh) &&
<------><------> !is_dx_internal_node(dir, block,
<------><------><------><------><------> (struct ext4_dir_entry *)bh->b_data) &&
<------><------> !ext4_dirblock_csum_verify(dir, bh)) {
<------><------><------>EXT4_ERROR_INODE_ERR(dir, EFSBADCRC,
<------><------><------><------><------> "checksumming directory "
<------><------><------><------><------> "block %lu", (unsigned long)block);
<------><------><------>brelse(bh);
<------><------><------>ret = ERR_PTR(-EFSBADCRC);
<------><------><------>goto cleanup_and_exit;
<------><------>}
<------><------>set_buffer_verified(bh);
<------><------>i = search_dirblock(bh, dir, fname, block,
<------><------><------> block << EXT4_BLOCK_SIZE_BITS(sb), res_dir);
<------><------>if (i == 1) {
<------><------><------>if (lblk)
<------><------><------><------>*lblk = block;
<------><------><------>EXT4_I(dir)->i_dir_start_lookup = block;
<------><------><------>ret = bh;
<------><------><------>goto cleanup_and_exit;
<------><------>} else {
<------><------><------>brelse(bh);
<------><------><------>if (i < 0)
<------><------><------><------>goto cleanup_and_exit;
<------><------>}
<------>next:
<------><------>if (++block >= nblocks)
<------><------><------>block = 0;
<------>} while (block != start);
<------>/*
<------> * If the directory has grown while we were searching, then
<------> * search the last part of the directory before giving up.
<------> */
<------>block = nblocks;
<------>nblocks = dir->i_size >> EXT4_BLOCK_SIZE_BITS(sb);
<------>if (block < nblocks) {
<------><------>start = 0;
<------><------>goto restart;
<------>}
cleanup_and_exit:
<------>/* Clean up the read-ahead blocks */
<------>for (; ra_ptr < ra_max; ra_ptr++)
<------><------>brelse(bh_use[ra_ptr]);
<------>return ret;
}
static struct buffer_head *ext4_find_entry(struct inode *dir,
<------><------><------><------><------> const struct qstr *d_name,
<------><------><------><------><------> struct ext4_dir_entry_2 **res_dir,
<------><------><------><------><------> int *inlined, ext4_lblk_t *lblk)
{
<------>int err;
<------>struct ext4_filename fname;
<------>struct buffer_head *bh;
<------>err = ext4_fname_setup_filename(dir, d_name, 1, &fname);
<------>if (err == -ENOENT)
<------><------>return NULL;
<------>if (err)
<------><------>return ERR_PTR(err);
<------>bh = __ext4_find_entry(dir, &fname, res_dir, inlined, lblk);
<------>ext4_fname_free_filename(&fname);
<------>return bh;
}
static struct buffer_head *ext4_lookup_entry(struct inode *dir,
<------><------><------><------><------> struct dentry *dentry,
<------><------><------><------><------> struct ext4_dir_entry_2 **res_dir)
{
<------>int err;
<------>struct ext4_filename fname;
<------>struct buffer_head *bh;
<------>err = ext4_fname_prepare_lookup(dir, dentry, &fname);
<------>generic_set_encrypted_ci_d_ops(dentry);
<------>if (err == -ENOENT)
<------><------>return NULL;
<------>if (err)
<------><------>return ERR_PTR(err);
<------>bh = __ext4_find_entry(dir, &fname, res_dir, NULL, NULL);
<------>ext4_fname_free_filename(&fname);
<------>return bh;
}
static struct buffer_head * ext4_dx_find_entry(struct inode *dir,
<------><------><------>struct ext4_filename *fname,
<------><------><------>struct ext4_dir_entry_2 **res_dir, ext4_lblk_t *lblk)
{
<------>struct super_block * sb = dir->i_sb;
<------>struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
<------>struct buffer_head *bh;
<------>ext4_lblk_t block;
<------>int retval;
#ifdef CONFIG_FS_ENCRYPTION
<------>*res_dir = NULL;
#endif
<------>frame = dx_probe(fname, dir, NULL, frames);
<------>if (IS_ERR(frame))
<------><------>return (struct buffer_head *) frame;
<------>do {
<------><------>block = dx_get_block(frame->at);
<------><------>if (lblk)
<------><------><------>*lblk = block;
<------><------>bh = ext4_read_dirblock(dir, block, DIRENT_HTREE);
<------><------>if (IS_ERR(bh))
<------><------><------>goto errout;
<------><------>retval = search_dirblock(bh, dir, fname, block,
<------><------><------><------><------> block << EXT4_BLOCK_SIZE_BITS(sb),
<------><------><------><------><------> res_dir);
<------><------>if (retval == 1)
<------><------><------>goto success;
<------><------>brelse(bh);
<------><------>if (retval == -1) {
<------><------><------>bh = ERR_PTR(ERR_BAD_DX_DIR);
<------><------><------>goto errout;
<------><------>}
<------><------>/* Check to see if we should continue to search */
<------><------>retval = ext4_htree_next_block(dir, fname->hinfo.hash, frame,
<------><------><------><------><------> frames, NULL);
<------><------>if (retval < 0) {
<------><------><------>ext4_warning_inode(dir,
<------><------><------><------>"error %d reading directory index block",
<------><------><------><------>retval);
<------><------><------>bh = ERR_PTR(retval);
<------><------><------>goto errout;
<------><------>}
<------>} while (retval == 1);
<------>bh = NULL;
errout:
<------>dxtrace(printk(KERN_DEBUG "%s not found\n", fname->usr_fname->name));
success:
<------>dx_release(frames);
<------>return bh;
}
static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
<------>struct inode *inode;
<------>struct ext4_dir_entry_2 *de;
<------>struct buffer_head *bh;
<------>if (dentry->d_name.len > EXT4_NAME_LEN)
<------><------>return ERR_PTR(-ENAMETOOLONG);
<------>bh = ext4_lookup_entry(dir, dentry, &de);
<------>if (IS_ERR(bh))
<------><------>return ERR_CAST(bh);
<------>inode = NULL;
<------>if (bh) {
<------><------>__u32 ino = le32_to_cpu(de->inode);
<------><------>brelse(bh);
<------><------>if (!ext4_valid_inum(dir->i_sb, ino)) {
<------><------><------>EXT4_ERROR_INODE(dir, "bad inode number: %u", ino);
<------><------><------>return ERR_PTR(-EFSCORRUPTED);
<------><------>}
<------><------>if (unlikely(ino == dir->i_ino)) {
<------><------><------>EXT4_ERROR_INODE(dir, "'%pd' linked to parent dir",
<------><------><------><------><------> dentry);
<------><------><------>return ERR_PTR(-EFSCORRUPTED);
<------><------>}
<------><------>inode = ext4_iget(dir->i_sb, ino, EXT4_IGET_NORMAL);
<------><------>if (inode == ERR_PTR(-ESTALE)) {
<------><------><------>EXT4_ERROR_INODE(dir,
<------><------><------><------><------> "deleted inode referenced: %u",
<------><------><------><------><------> ino);
<------><------><------>return ERR_PTR(-EFSCORRUPTED);
<------><------>}
<------><------>if (!IS_ERR(inode) && IS_ENCRYPTED(dir) &&
<------><------> (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
<------><------> !fscrypt_has_permitted_context(dir, inode)) {
<------><------><------>ext4_warning(inode->i_sb,
<------><------><------><------> "Inconsistent encryption contexts: %lu/%lu",
<------><------><------><------> dir->i_ino, inode->i_ino);
<------><------><------>iput(inode);
<------><------><------>return ERR_PTR(-EPERM);
<------><------>}
<------>}
#ifdef CONFIG_UNICODE
<------>if (!inode && IS_CASEFOLDED(dir)) {
<------><------>/* Eventually we want to call d_add_ci(dentry, NULL)
<------><------> * for negative dentries in the encoding case as
<------><------> * well. For now, prevent the negative dentry
<------><------> * from being cached.
<------><------> */
<------><------>return NULL;
<------>}
#endif
<------>return d_splice_alias(inode, dentry);
}
struct dentry *ext4_get_parent(struct dentry *child)
{
<------>__u32 ino;
<------>static const struct qstr dotdot = QSTR_INIT("..", 2);
<------>struct ext4_dir_entry_2 * de;
<------>struct buffer_head *bh;
<------>bh = ext4_find_entry(d_inode(child), &dotdot, &de, NULL, NULL);
<------>if (IS_ERR(bh))
<------><------>return ERR_CAST(bh);
<------>if (!bh)
<------><------>return ERR_PTR(-ENOENT);
<------>ino = le32_to_cpu(de->inode);
<------>brelse(bh);
<------>if (!ext4_valid_inum(child->d_sb, ino)) {
<------><------>EXT4_ERROR_INODE(d_inode(child),
<------><------><------><------> "bad parent inode number: %u", ino);
<------><------>return ERR_PTR(-EFSCORRUPTED);
<------>}
<------>return d_obtain_alias(ext4_iget(child->d_sb, ino, EXT4_IGET_NORMAL));
}
/*
* Move count entries from end of map between two memory locations.
* Returns pointer to last entry moved.
*/
static struct ext4_dir_entry_2 *
dx_move_dirents(struct inode *dir, char *from, char *to,
<------><------>struct dx_map_entry *map, int count,
<------><------>unsigned blocksize)
{
<------>unsigned rec_len = 0;
<------>while (count--) {
<------><------>struct ext4_dir_entry_2 *de = (struct ext4_dir_entry_2 *)
<------><------><------><------><------><------>(from + (map->offs<<2));
<------><------>rec_len = ext4_dir_rec_len(de->name_len, dir);
<------><------>memcpy (to, de, rec_len);
<------><------>((struct ext4_dir_entry_2 *) to)->rec_len =
<------><------><------><------>ext4_rec_len_to_disk(rec_len, blocksize);
<------><------>de->inode = 0;
<------><------>map++;
<------><------>to += rec_len;
<------>}
<------>return (struct ext4_dir_entry_2 *) (to - rec_len);
}
/*
* Compact each dir entry in the range to the minimal rec_len.
* Returns pointer to last entry in range.
*/
static struct ext4_dir_entry_2 *dx_pack_dirents(struct inode *dir, char *base,
<------><------><------><------><------><------><------>unsigned int blocksize)
{
<------>struct ext4_dir_entry_2 *next, *to, *prev, *de = (struct ext4_dir_entry_2 *) base;
<------>unsigned rec_len = 0;
<------>prev = to = de;
<------>while ((char*)de < base + blocksize) {
<------><------>next = ext4_next_entry(de, blocksize);
<------><------>if (de->inode && de->name_len) {
<------><------><------>rec_len = ext4_dir_rec_len(de->name_len, dir);
<------><------><------>if (de > to)
<------><------><------><------>memmove(to, de, rec_len);
<------><------><------>to->rec_len = ext4_rec_len_to_disk(rec_len, blocksize);
<------><------><------>prev = to;
<------><------><------>to = (struct ext4_dir_entry_2 *) (((char *) to) + rec_len);
<------><------>}
<------><------>de = next;
<------>}
<------>return prev;
}
/*
* Split a full leaf block to make room for a new dir entry.
* Allocate a new block, and move entries so that they are approx. equally full.
* Returns pointer to de in block into which the new entry will be inserted.
*/
static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
<------><------><------>struct buffer_head **bh, struct dx_frame *frame,
<------><------><------>struct dx_hash_info *hinfo, ext4_lblk_t *newblock)
{
<------>unsigned blocksize = dir->i_sb->s_blocksize;
<------>unsigned count, continued;
<------>struct buffer_head *bh2;
<------>u32 hash2;
<------>struct dx_map_entry *map;
<------>char *data1 = (*bh)->b_data, *data2;
<------>unsigned split, move, size;
<------>struct ext4_dir_entry_2 *de = NULL, *de2;
<------>int csum_size = 0;
<------>int err = 0, i;
<------>if (ext4_has_metadata_csum(dir->i_sb))
<------><------>csum_size = sizeof(struct ext4_dir_entry_tail);
<------>bh2 = ext4_append(handle, dir, newblock);
<------>if (IS_ERR(bh2)) {
<------><------>brelse(*bh);
<------><------>*bh = NULL;
<------><------>return (struct ext4_dir_entry_2 *) bh2;
<------>}
<------>BUFFER_TRACE(*bh, "get_write_access");
<------>err = ext4_journal_get_write_access(handle, *bh);
<------>if (err)
<------><------>goto journal_error;
<------>BUFFER_TRACE(frame->bh, "get_write_access");
<------>err = ext4_journal_get_write_access(handle, frame->bh);
<------>if (err)
<------><------>goto journal_error;
<------>data2 = bh2->b_data;
<------>/* create map in the end of data2 block */
<------>map = (struct dx_map_entry *) (data2 + blocksize);
<------>count = dx_make_map(dir, (struct ext4_dir_entry_2 *) data1,
<------><------><------> blocksize, hinfo, map);
<------>map -= count;
<------>dx_sort_map(map, count);
<------>/* Ensure that neither split block is over half full */
<------>size = 0;
<------>move = 0;
<------>for (i = count-1; i >= 0; i--) {
<------><------>/* is more than half of this entry in 2nd half of the block? */
<------><------>if (size + map[i].size/2 > blocksize/2)
<------><------><------>break;
<------><------>size += map[i].size;
<------><------>move++;
<------>}
<------>/*
<------> * map index at which we will split
<------> *
<------> * If the sum of active entries didn't exceed half the block size, just
<------> * split it in half by count; each resulting block will have at least
<------> * half the space free.
<------> */
<------>if (i > 0)
<------><------>split = count - move;
<------>else
<------><------>split = count/2;
<------>hash2 = map[split].hash;
<------>continued = hash2 == map[split - 1].hash;
<------>dxtrace(printk(KERN_INFO "Split block %lu at %x, %i/%i\n",
<------><------><------>(unsigned long)dx_get_block(frame->at),
<------><------><------><------><------>hash2, split, count-split));
<------>/* Fancy dance to stay within two buffers */
<------>de2 = dx_move_dirents(dir, data1, data2, map + split, count - split,
<------><------><------> blocksize);
<------>de = dx_pack_dirents(dir, data1, blocksize);
<------>de->rec_len = ext4_rec_len_to_disk(data1 + (blocksize - csum_size) -
<------><------><------><------><------> (char *) de,
<------><------><------><------><------> blocksize);
<------>de2->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
<------><------><------><------><------> (char *) de2,
<------><------><------><------><------> blocksize);
<------>if (csum_size) {
<------><------>ext4_initialize_dirent_tail(*bh, blocksize);
<------><------>ext4_initialize_dirent_tail(bh2, blocksize);
<------>}
<------>dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data1,
<------><------><------>blocksize, 1));
<------>dxtrace(dx_show_leaf(dir, hinfo, (struct ext4_dir_entry_2 *) data2,
<------><------><------>blocksize, 1));
<------>/* Which block gets the new entry? */
<------>if (hinfo->hash >= hash2) {
<------><------>swap(*bh, bh2);
<------><------>de = de2;
<------>}
<------>dx_insert_block(frame, hash2 + continued, *newblock);
<------>err = ext4_handle_dirty_dirblock(handle, dir, bh2);
<------>if (err)
<------><------>goto journal_error;
<------>err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
<------>if (err)
<------><------>goto journal_error;
<------>brelse(bh2);
<------>dxtrace(dx_show_index("frame", frame->entries));
<------>return de;
journal_error:
<------>brelse(*bh);
<------>brelse(bh2);
<------>*bh = NULL;
<------>ext4_std_error(dir->i_sb, err);
<------>return ERR_PTR(err);
}
int ext4_find_dest_de(struct inode *dir, struct inode *inode,
<------><------> ext4_lblk_t lblk,
<------><------> struct buffer_head *bh,
<------><------> void *buf, int buf_size,
<------><------> struct ext4_filename *fname,
<------><------> struct ext4_dir_entry_2 **dest_de)
{
<------>struct ext4_dir_entry_2 *de;
<------>unsigned short reclen = ext4_dir_rec_len(fname_len(fname), dir);
<------>int nlen, rlen;
<------>unsigned int offset = 0;
<------>char *top;
<------>de = (struct ext4_dir_entry_2 *)buf;
<------>top = buf + buf_size - reclen;
<------>while ((char *) de <= top) {
<------><------>if (ext4_check_dir_entry(dir, NULL, de, bh,
<------><------><------><------><------> buf, buf_size, lblk, offset))
<------><------><------>return -EFSCORRUPTED;
<------><------>if (ext4_match(dir, fname, de))
<------><------><------>return -EEXIST;
<------><------>nlen = ext4_dir_rec_len(de->name_len, dir);
<------><------>rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
<------><------>if ((de->inode ? rlen - nlen : rlen) >= reclen)
<------><------><------>break;
<------><------>de = (struct ext4_dir_entry_2 *)((char *)de + rlen);
<------><------>offset += rlen;
<------>}
<------>if ((char *) de > top)
<------><------>return -ENOSPC;
<------>*dest_de = de;
<------>return 0;
}
void ext4_insert_dentry(struct inode *dir,
<------><------><------>struct inode *inode,
<------><------><------>struct ext4_dir_entry_2 *de,
<------><------><------>int buf_size,
<------><------><------>struct ext4_filename *fname)
{
<------>int nlen, rlen;
<------>nlen = ext4_dir_rec_len(de->name_len, dir);
<------>rlen = ext4_rec_len_from_disk(de->rec_len, buf_size);
<------>if (de->inode) {
<------><------>struct ext4_dir_entry_2 *de1 =
<------><------><------>(struct ext4_dir_entry_2 *)((char *)de + nlen);
<------><------>de1->rec_len = ext4_rec_len_to_disk(rlen - nlen, buf_size);
<------><------>de->rec_len = ext4_rec_len_to_disk(nlen, buf_size);
<------><------>de = de1;
<------>}
<------>de->file_type = EXT4_FT_UNKNOWN;
<------>de->inode = cpu_to_le32(inode->i_ino);
<------>ext4_set_de_type(inode->i_sb, de, inode->i_mode);
<------>de->name_len = fname_len(fname);
<------>memcpy(de->name, fname_name(fname), fname_len(fname));
<------>if (ext4_hash_in_dirent(dir)) {
<------><------>struct dx_hash_info *hinfo = &fname->hinfo;
<------><------>EXT4_DIRENT_HASHES(de)->hash = cpu_to_le32(hinfo->hash);
<------><------>EXT4_DIRENT_HASHES(de)->minor_hash =
<------><------><------><------><------><------>cpu_to_le32(hinfo->minor_hash);
<------>}
}
/*
* Add a new entry into a directory (leaf) block. If de is non-NULL,
* it points to a directory entry which is guaranteed to be large
* enough for new directory entry. If de is NULL, then
* add_dirent_to_buf will attempt search the directory block for
* space. It will return -ENOSPC if no space is available, and -EIO
* and -EEXIST if directory entry already exists.
*/
static int add_dirent_to_buf(handle_t *handle, struct ext4_filename *fname,
<------><------><------> struct inode *dir,
<------><------><------> struct inode *inode, struct ext4_dir_entry_2 *de,
<------><------><------> ext4_lblk_t blk,
<------><------><------> struct buffer_head *bh)
{
<------>unsigned int blocksize = dir->i_sb->s_blocksize;
<------>int csum_size = 0;
<------>int err, err2;
<------>if (ext4_has_metadata_csum(inode->i_sb))
<------><------>csum_size = sizeof(struct ext4_dir_entry_tail);
<------>if (!de) {
<------><------>err = ext4_find_dest_de(dir, inode, blk, bh, bh->b_data,
<------><------><------><------><------>blocksize - csum_size, fname, &de);
<------><------>if (err)
<------><------><------>return err;
<------>}
<------>BUFFER_TRACE(bh, "get_write_access");
<------>err = ext4_journal_get_write_access(handle, bh);
<------>if (err) {
<------><------>ext4_std_error(dir->i_sb, err);
<------><------>return err;
<------>}
<------>/* By now the buffer is marked for journaling */
<------>ext4_insert_dentry(dir, inode, de, blocksize, fname);
<------>/*
<------> * XXX shouldn't update any times until successful
<------> * completion of syscall, but too many callers depend
<------> * on this.
<------> *
<------> * XXX similarly, too many callers depend on
<------> * ext4_new_inode() setting the times, but error
<------> * recovery deletes the inode, so the worst that can
<------> * happen is that the times are slightly out of date
<------> * and/or different from the directory change time.
<------> */
<------>dir->i_mtime = dir->i_ctime = current_time(dir);
<------>ext4_update_dx_flag(dir);
<------>inode_inc_iversion(dir);
<------>err2 = ext4_mark_inode_dirty(handle, dir);
<------>BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
<------>err = ext4_handle_dirty_dirblock(handle, dir, bh);
<------>if (err)
<------><------>ext4_std_error(dir->i_sb, err);
<------>return err ? err : err2;
}
/*
* This converts a one block unindexed directory to a 3 block indexed
* directory, and adds the dentry to the indexed directory.
*/
static int make_indexed_dir(handle_t *handle, struct ext4_filename *fname,
<------><------><------> struct inode *dir,
<------><------><------> struct inode *inode, struct buffer_head *bh)
{
<------>struct buffer_head *bh2;
<------>struct dx_root *root;
<------>struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
<------>struct dx_entry *entries;
<------>struct ext4_dir_entry_2 *de, *de2;
<------>char *data2, *top;
<------>unsigned len;
<------>int retval;
<------>unsigned blocksize;
<------>ext4_lblk_t block;
<------>struct fake_dirent *fde;
<------>int csum_size = 0;
<------>if (ext4_has_metadata_csum(inode->i_sb))
<------><------>csum_size = sizeof(struct ext4_dir_entry_tail);
<------>blocksize = dir->i_sb->s_blocksize;
<------>dxtrace(printk(KERN_DEBUG "Creating index: inode %lu\n", dir->i_ino));
<------>BUFFER_TRACE(bh, "get_write_access");
<------>retval = ext4_journal_get_write_access(handle, bh);
<------>if (retval) {
<------><------>ext4_std_error(dir->i_sb, retval);
<------><------>brelse(bh);
<------><------>return retval;
<------>}
<------>root = (struct dx_root *) bh->b_data;
<------>/* The 0th block becomes the root, move the dirents out */
<------>fde = &root->dotdot;
<------>de = (struct ext4_dir_entry_2 *)((char *)fde +
<------><------>ext4_rec_len_from_disk(fde->rec_len, blocksize));
<------>if ((char *) de >= (((char *) root) + blocksize)) {
<------><------>EXT4_ERROR_INODE(dir, "invalid rec_len for '..'");
<------><------>brelse(bh);
<------><------>return -EFSCORRUPTED;
<------>}
<------>len = ((char *) root) + (blocksize - csum_size) - (char *) de;
<------>/* Allocate new block for the 0th block's dirents */
<------>bh2 = ext4_append(handle, dir, &block);
<------>if (IS_ERR(bh2)) {
<------><------>brelse(bh);
<------><------>return PTR_ERR(bh2);
<------>}
<------>ext4_set_inode_flag(dir, EXT4_INODE_INDEX);
<------>data2 = bh2->b_data;
<------>memcpy(data2, de, len);
<------>de = (struct ext4_dir_entry_2 *) data2;
<------>top = data2 + len;
<------>while ((char *)(de2 = ext4_next_entry(de, blocksize)) < top)
<------><------>de = de2;
<------>de->rec_len = ext4_rec_len_to_disk(data2 + (blocksize - csum_size) -
<------><------><------><------><------> (char *) de, blocksize);
<------>if (csum_size)
<------><------>ext4_initialize_dirent_tail(bh2, blocksize);
<------>/* Initialize the root; the dot dirents already exist */
<------>de = (struct ext4_dir_entry_2 *) (&root->dotdot);
<------>de->rec_len = ext4_rec_len_to_disk(
<------><------><------>blocksize - ext4_dir_rec_len(2, NULL), blocksize);
<------>memset (&root->info, 0, sizeof(root->info));
<------>root->info.info_length = sizeof(root->info);
<------>if (ext4_hash_in_dirent(dir))
<------><------>root->info.hash_version = DX_HASH_SIPHASH;
<------>else
<------><------>root->info.hash_version =
<------><------><------><------>EXT4_SB(dir->i_sb)->s_def_hash_version;
<------>entries = root->entries;
<------>dx_set_block(entries, 1);
<------>dx_set_count(entries, 1);
<------>dx_set_limit(entries, dx_root_limit(dir, sizeof(root->info)));
<------>/* Initialize as for dx_probe */
<------>fname->hinfo.hash_version = root->info.hash_version;
<------>if (fname->hinfo.hash_version <= DX_HASH_TEA)
<------><------>fname->hinfo.hash_version += EXT4_SB(dir->i_sb)->s_hash_unsigned;
<------>fname->hinfo.seed = EXT4_SB(dir->i_sb)->s_hash_seed;
<------>/* casefolded encrypted hashes are computed on fname setup */
<------>if (!ext4_hash_in_dirent(dir))
<------><------>ext4fs_dirhash(dir, fname_name(fname),
<------><------><------><------>fname_len(fname), &fname->hinfo);
<------>memset(frames, 0, sizeof(frames));
<------>frame = frames;
<------>frame->entries = entries;
<------>frame->at = entries;
<------>frame->bh = bh;
<------>retval = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
<------>if (retval)
<------><------>goto out_frames;
<------>retval = ext4_handle_dirty_dirblock(handle, dir, bh2);
<------>if (retval)
<------><------>goto out_frames;
<------>de = do_split(handle, dir, &bh2, frame, &fname->hinfo, &block);
<------>if (IS_ERR(de)) {
<------><------>retval = PTR_ERR(de);
<------><------>goto out_frames;
<------>}
<------>retval = add_dirent_to_buf(handle, fname, dir, inode, de, block, bh2);
out_frames:
<------>/*
<------> * Even if the block split failed, we have to properly write
<------> * out all the changes we did so far. Otherwise we can end up
<------> * with corrupted filesystem.
<------> */
<------>if (retval)
<------><------>ext4_mark_inode_dirty(handle, dir);
<------>dx_release(frames);
<------>brelse(bh2);
<------>return retval;
}
/*
* ext4_add_entry()
*
* adds a file entry to the specified directory, using the same
* semantics as ext4_find_entry(). It returns NULL if it failed.
*
* NOTE!! The inode part of 'de' is left at 0 - which means you
* may not sleep between calling this and putting something into
* the entry, as someone else might have used it while you slept.
*/
static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
<------><------><------> struct inode *inode)
{
<------>struct inode *dir = d_inode(dentry->d_parent);
<------>struct buffer_head *bh = NULL;
<------>struct ext4_dir_entry_2 *de;
<------>struct super_block *sb;
<------>struct ext4_filename fname;
<------>int retval;
<------>int dx_fallback=0;
<------>unsigned blocksize;
<------>ext4_lblk_t block, blocks;
<------>int csum_size = 0;
<------>if (ext4_has_metadata_csum(inode->i_sb))
<------><------>csum_size = sizeof(struct ext4_dir_entry_tail);
<------>sb = dir->i_sb;
<------>blocksize = sb->s_blocksize;
<------>if (!dentry->d_name.len)
<------><------>return -EINVAL;
<------>if (fscrypt_is_nokey_name(dentry))
<------><------>return -ENOKEY;
#ifdef CONFIG_UNICODE
<------>if (sb_has_strict_encoding(sb) && IS_CASEFOLDED(dir) &&
<------> sb->s_encoding && utf8_validate(sb->s_encoding, &dentry->d_name))
<------><------>return -EINVAL;
#endif
<------>retval = ext4_fname_setup_filename(dir, &dentry->d_name, 0, &fname);
<------>if (retval)
<------><------>return retval;
<------>if (ext4_has_inline_data(dir)) {
<------><------>retval = ext4_try_add_inline_entry(handle, &fname, dir, inode);
<------><------>if (retval < 0)
<------><------><------>goto out;
<------><------>if (retval == 1) {
<------><------><------>retval = 0;
<------><------><------>goto out;
<------><------>}
<------>}
<------>if (is_dx(dir)) {
<------><------>retval = ext4_dx_add_entry(handle, &fname, dir, inode);
<------><------>if (!retval || (retval != ERR_BAD_DX_DIR))
<------><------><------>goto out;
<------><------>/* Can we just ignore htree data? */
<------><------>if (ext4_has_metadata_csum(sb)) {
<------><------><------>EXT4_ERROR_INODE(dir,
<------><------><------><------>"Directory has corrupted htree index.");
<------><------><------>retval = -EFSCORRUPTED;
<------><------><------>goto out;
<------><------>}
<------><------>ext4_clear_inode_flag(dir, EXT4_INODE_INDEX);
<------><------>dx_fallback++;
<------><------>retval = ext4_mark_inode_dirty(handle, dir);
<------><------>if (unlikely(retval))
<------><------><------>goto out;
<------>}
<------>blocks = dir->i_size >> sb->s_blocksize_bits;
<------>for (block = 0; block < blocks; block++) {
<------><------>bh = ext4_read_dirblock(dir, block, DIRENT);
<------><------>if (bh == NULL) {
<------><------><------>bh = ext4_bread(handle, dir, block,
<------><------><------><------><------>EXT4_GET_BLOCKS_CREATE);
<------><------><------>goto add_to_new_block;
<------><------>}
<------><------>if (IS_ERR(bh)) {
<------><------><------>retval = PTR_ERR(bh);
<------><------><------>bh = NULL;
<------><------><------>goto out;
<------><------>}
<------><------>retval = add_dirent_to_buf(handle, &fname, dir, inode,
<------><------><------><------><------> NULL, block, bh);
<------><------>if (retval != -ENOSPC)
<------><------><------>goto out;
<------><------>if (blocks == 1 && !dx_fallback &&
<------><------> ext4_has_feature_dir_index(sb)) {
<------><------><------>retval = make_indexed_dir(handle, &fname, dir,
<------><------><------><------><------><------> inode, bh);
<------><------><------>bh = NULL; /* make_indexed_dir releases bh */
<------><------><------>goto out;
<------><------>}
<------><------>brelse(bh);
<------>}
<------>bh = ext4_append(handle, dir, &block);
add_to_new_block:
<------>if (IS_ERR(bh)) {
<------><------>retval = PTR_ERR(bh);
<------><------>bh = NULL;
<------><------>goto out;
<------>}
<------>de = (struct ext4_dir_entry_2 *) bh->b_data;
<------>de->inode = 0;
<------>de->rec_len = ext4_rec_len_to_disk(blocksize - csum_size, blocksize);
<------>if (csum_size)
<------><------>ext4_initialize_dirent_tail(bh, blocksize);
<------>retval = add_dirent_to_buf(handle, &fname, dir, inode, de, block, bh);
out:
<------>ext4_fname_free_filename(&fname);
<------>brelse(bh);
<------>if (retval == 0)
<------><------>ext4_set_inode_state(inode, EXT4_STATE_NEWENTRY);
<------>return retval;
}
/*
* Returns 0 for success, or a negative error value
*/
static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
<------><------><------> struct inode *dir, struct inode *inode)
{
<------>struct dx_frame frames[EXT4_HTREE_LEVEL], *frame;
<------>struct dx_entry *entries, *at;
<------>struct buffer_head *bh;
<------>struct super_block *sb = dir->i_sb;
<------>struct ext4_dir_entry_2 *de;
<------>int restart;
<------>int err;
<------>ext4_lblk_t lblk;
again:
<------>restart = 0;
<------>frame = dx_probe(fname, dir, NULL, frames);
<------>if (IS_ERR(frame))
<------><------>return PTR_ERR(frame);
<------>entries = frame->entries;
<------>at = frame->at;
<------>lblk = dx_get_block(frame->at);
<------>bh = ext4_read_dirblock(dir, lblk, DIRENT_HTREE);
<------>if (IS_ERR(bh)) {
<------><------>err = PTR_ERR(bh);
<------><------>bh = NULL;
<------><------>goto cleanup;
<------>}
<------>BUFFER_TRACE(bh, "get_write_access");
<------>err = ext4_journal_get_write_access(handle, bh);
<------>if (err)
<------><------>goto journal_error;
<------>err = add_dirent_to_buf(handle, fname, dir, inode, NULL, lblk, bh);
<------>if (err != -ENOSPC)
<------><------>goto cleanup;
<------>err = 0;
<------>/* Block full, should compress but for now just split */
<------>dxtrace(printk(KERN_DEBUG "using %u of %u node entries\n",
<------><------> dx_get_count(entries), dx_get_limit(entries)));
<------>/* Need to split index? */
<------>if (dx_get_count(entries) == dx_get_limit(entries)) {
<------><------>ext4_lblk_t newblock;
<------><------>int levels = frame - frames + 1;
<------><------>unsigned int icount;
<------><------>int add_level = 1;
<------><------>struct dx_entry *entries2;
<------><------>struct dx_node *node2;
<------><------>struct buffer_head *bh2;
<------><------>while (frame > frames) {
<------><------><------>if (dx_get_count((frame - 1)->entries) <
<------><------><------> dx_get_limit((frame - 1)->entries)) {
<------><------><------><------>add_level = 0;
<------><------><------><------>break;
<------><------><------>}
<------><------><------>frame--; /* split higher index block */
<------><------><------>at = frame->at;
<------><------><------>entries = frame->entries;
<------><------><------>restart = 1;
<------><------>}
<------><------>if (add_level && levels == ext4_dir_htree_level(sb)) {
<------><------><------>ext4_warning(sb, "Directory (ino: %lu) index full, "
<------><------><------><------><------> "reach max htree level :%d",
<------><------><------><------><------> dir->i_ino, levels);
<------><------><------>if (ext4_dir_htree_level(sb) < EXT4_HTREE_LEVEL) {
<------><------><------><------>ext4_warning(sb, "Large directory feature is "
<------><------><------><------><------><------> "not enabled on this "
<------><------><------><------><------><------> "filesystem");
<------><------><------>}
<------><------><------>err = -ENOSPC;
<------><------><------>goto cleanup;
<------><------>}
<------><------>icount = dx_get_count(entries);
<------><------>bh2 = ext4_append(handle, dir, &newblock);
<------><------>if (IS_ERR(bh2)) {
<------><------><------>err = PTR_ERR(bh2);
<------><------><------>goto cleanup;
<------><------>}
<------><------>node2 = (struct dx_node *)(bh2->b_data);
<------><------>entries2 = node2->entries;
<------><------>memset(&node2->fake, 0, sizeof(struct fake_dirent));
<------><------>node2->fake.rec_len = ext4_rec_len_to_disk(sb->s_blocksize,
<------><------><------><------><------><------><------> sb->s_blocksize);
<------><------>BUFFER_TRACE(frame->bh, "get_write_access");
<------><------>err = ext4_journal_get_write_access(handle, frame->bh);
<------><------>if (err)
<------><------><------>goto journal_error;
<------><------>if (!add_level) {
<------><------><------>unsigned icount1 = icount/2, icount2 = icount - icount1;
<------><------><------>unsigned hash2 = dx_get_hash(entries + icount1);
<------><------><------>dxtrace(printk(KERN_DEBUG "Split index %i/%i\n",
<------><------><------><------> icount1, icount2));
<------><------><------>BUFFER_TRACE(frame->bh, "get_write_access"); /* index root */
<------><------><------>err = ext4_journal_get_write_access(handle,
<------><------><------><------><------><------><------> (frame - 1)->bh);
<------><------><------>if (err)
<------><------><------><------>goto journal_error;
<------><------><------>memcpy((char *) entries2, (char *) (entries + icount1),
<------><------><------> icount2 * sizeof(struct dx_entry));
<------><------><------>dx_set_count(entries, icount1);
<------><------><------>dx_set_count(entries2, icount2);
<------><------><------>dx_set_limit(entries2, dx_node_limit(dir));
<------><------><------>/* Which index block gets the new entry? */
<------><------><------>if (at - entries >= icount1) {
<------><------><------><------>frame->at = at = at - entries - icount1 + entries2;
<------><------><------><------>frame->entries = entries = entries2;
<------><------><------><------>swap(frame->bh, bh2);
<------><------><------>}
<------><------><------>dx_insert_block((frame - 1), hash2, newblock);
<------><------><------>dxtrace(dx_show_index("node", frame->entries));
<------><------><------>dxtrace(dx_show_index("node",
<------><------><------> ((struct dx_node *) bh2->b_data)->entries));
<------><------><------>err = ext4_handle_dirty_dx_node(handle, dir, bh2);
<------><------><------>if (err)
<------><------><------><------>goto journal_error;
<------><------><------>brelse (bh2);
<------><------><------>err = ext4_handle_dirty_dx_node(handle, dir,
<------><------><------><------><------><------> (frame - 1)->bh);
<------><------><------>if (err)
<------><------><------><------>goto journal_error;
<------><------><------>err = ext4_handle_dirty_dx_node(handle, dir,
<------><------><------><------><------><------><------>frame->bh);
<------><------><------>if (restart || err)
<------><------><------><------>goto journal_error;
<------><------>} else {
<------><------><------>struct dx_root *dxroot;
<------><------><------>memcpy((char *) entries2, (char *) entries,
<------><------><------> icount * sizeof(struct dx_entry));
<------><------><------>dx_set_limit(entries2, dx_node_limit(dir));
<------><------><------>/* Set up root */
<------><------><------>dx_set_count(entries, 1);
<------><------><------>dx_set_block(entries + 0, newblock);
<------><------><------>dxroot = (struct dx_root *)frames[0].bh->b_data;
<------><------><------>dxroot->info.indirect_levels += 1;
<------><------><------>dxtrace(printk(KERN_DEBUG
<------><------><------><------> "Creating %d level index...\n",
<------><------><------><------> dxroot->info.indirect_levels));
<------><------><------>err = ext4_handle_dirty_dx_node(handle, dir, frame->bh);
<------><------><------>if (err)
<------><------><------><------>goto journal_error;
<------><------><------>err = ext4_handle_dirty_dx_node(handle, dir, bh2);
<------><------><------>brelse(bh2);
<------><------><------>restart = 1;
<------><------><------>goto journal_error;
<------><------>}
<------>}
<------>de = do_split(handle, dir, &bh, frame, &fname->hinfo, &lblk);
<------>if (IS_ERR(de)) {
<------><------>err = PTR_ERR(de);
<------><------>goto cleanup;
<------>}
<------>err = add_dirent_to_buf(handle, fname, dir, inode, de, lblk, bh);
<------>goto cleanup;
journal_error:
<------>ext4_std_error(dir->i_sb, err); /* this is a no-op if err == 0 */
cleanup:
<------>brelse(bh);
<------>dx_release(frames);
<------>/* @restart is true means htree-path has been changed, we need to
<------> * repeat dx_probe() to find out valid htree-path
<------> */
<------>if (restart && err == 0)
<------><------>goto again;
<------>return err;
}
/*
* ext4_generic_delete_entry deletes a directory entry by merging it
* with the previous entry
*/
int ext4_generic_delete_entry(struct inode *dir,
<------><------><------> struct ext4_dir_entry_2 *de_del,
<------><------><------> ext4_lblk_t lblk,
<------><------><------> struct buffer_head *bh,
<------><------><------> void *entry_buf,
<------><------><------> int buf_size,
<------><------><------> int csum_size)
{
<------>struct ext4_dir_entry_2 *de, *pde;
<------>unsigned int blocksize = dir->i_sb->s_blocksize;
<------>int i;
<------>i = 0;
<------>pde = NULL;
<------>de = (struct ext4_dir_entry_2 *)entry_buf;
<------>while (i < buf_size - csum_size) {
<------><------>if (ext4_check_dir_entry(dir, NULL, de, bh,
<------><------><------><------><------> entry_buf, buf_size, lblk, i))
<------><------><------>return -EFSCORRUPTED;
<------><------>if (de == de_del) {
<------><------><------>if (pde)
<------><------><------><------>pde->rec_len = ext4_rec_len_to_disk(
<------><------><------><------><------>ext4_rec_len_from_disk(pde->rec_len,
<------><------><------><------><------><------><------> blocksize) +
<------><------><------><------><------>ext4_rec_len_from_disk(de->rec_len,
<------><------><------><------><------><------><------> blocksize),
<------><------><------><------><------>blocksize);
<------><------><------>else
<------><------><------><------>de->inode = 0;
<------><------><------>inode_inc_iversion(dir);
<------><------><------>return 0;
<------><------>}
<------><------>i += ext4_rec_len_from_disk(de->rec_len, blocksize);
<------><------>pde = de;
<------><------>de = ext4_next_entry(de, blocksize);
<------>}
<------>return -ENOENT;
}
static int ext4_delete_entry(handle_t *handle,
<------><------><------> struct inode *dir,
<------><------><------> struct ext4_dir_entry_2 *de_del,
<------><------><------> ext4_lblk_t lblk,
<------><------><------> struct buffer_head *bh)
{
<------>int err, csum_size = 0;
<------>if (ext4_has_inline_data(dir)) {
<------><------>int has_inline_data = 1;
<------><------>err = ext4_delete_inline_entry(handle, dir, de_del, bh,
<------><------><------><------><------> &has_inline_data);
<------><------>if (has_inline_data)
<------><------><------>return err;
<------>}
<------>if (ext4_has_metadata_csum(dir->i_sb))
<------><------>csum_size = sizeof(struct ext4_dir_entry_tail);
<------>BUFFER_TRACE(bh, "get_write_access");
<------>err = ext4_journal_get_write_access(handle, bh);
<------>if (unlikely(err))
<------><------>goto out;
<------>err = ext4_generic_delete_entry(dir, de_del, lblk, bh, bh->b_data,
<------><------><------><------><------>dir->i_sb->s_blocksize, csum_size);
<------>if (err)
<------><------>goto out;
<------>BUFFER_TRACE(bh, "call ext4_handle_dirty_metadata");
<------>err = ext4_handle_dirty_dirblock(handle, dir, bh);
<------>if (unlikely(err))
<------><------>goto out;
<------>return 0;
out:
<------>if (err != -ENOENT)
<------><------>ext4_std_error(dir->i_sb, err);
<------>return err;
}
/*
* Set directory link count to 1 if nlinks > EXT4_LINK_MAX, or if nlinks == 2
* since this indicates that nlinks count was previously 1 to avoid overflowing
* the 16-bit i_links_count field on disk. Directories with i_nlink == 1 mean
* that subdirectory link counts are not being maintained accurately.
*
* The caller has already checked for i_nlink overflow in case the DIR_LINK
* feature is not enabled and returned -EMLINK. The is_dx() check is a proxy
* for checking S_ISDIR(inode) (since the INODE_INDEX feature will not be set
* on regular files) and to avoid creating huge/slow non-HTREE directories.
*/
static void ext4_inc_count(struct inode *inode)
{
<------>inc_nlink(inode);
<------>if (is_dx(inode) &&
<------> (inode->i_nlink > EXT4_LINK_MAX || inode->i_nlink == 2))
<------><------>set_nlink(inode, 1);
}
/*
* If a directory had nlink == 1, then we should let it be 1. This indicates
* directory has >EXT4_LINK_MAX subdirs.
*/
static void ext4_dec_count(struct inode *inode)
{
<------>if (!S_ISDIR(inode->i_mode) || inode->i_nlink > 2)
<------><------>drop_nlink(inode);
}
/*
* Add non-directory inode to a directory. On success, the inode reference is
* consumed by dentry is instantiation. This is also indicated by clearing of
* *inodep pointer. On failure, the caller is responsible for dropping the
* inode reference in the safe context.
*/
static int ext4_add_nondir(handle_t *handle,
<------><------>struct dentry *dentry, struct inode **inodep)
{
<------>struct inode *dir = d_inode(dentry->d_parent);
<------>struct inode *inode = *inodep;
<------>int err = ext4_add_entry(handle, dentry, inode);
<------>if (!err) {
<------><------>err = ext4_mark_inode_dirty(handle, inode);
<------><------>if (IS_DIRSYNC(dir))
<------><------><------>ext4_handle_sync(handle);
<------><------>d_instantiate_new(dentry, inode);
<------><------>*inodep = NULL;
<------><------>return err;
<------>}
<------>drop_nlink(inode);
<------>ext4_orphan_add(handle, inode);
<------>unlock_new_inode(inode);
<------>return err;
}
/*
* By the time this is called, we already have created
* the directory cache entry for the new file, but it
* is so far negative - it has no inode.
*
* If the create succeeds, we fill in the inode information
* with d_instantiate().
*/
static int ext4_create(struct inode *dir, struct dentry *dentry, umode_t mode,
<------><------> bool excl)
{
<------>handle_t *handle;
<------>struct inode *inode;
<------>int err, credits, retries = 0;
<------>err = dquot_initialize(dir);
<------>if (err)
<------><------>return err;
<------>credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
<------><------> EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
retry:
<------>inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
<------><------><------><------><------> NULL, EXT4_HT_DIR, credits);
<------>handle = ext4_journal_current_handle();
<------>err = PTR_ERR(inode);
<------>if (!IS_ERR(inode)) {
<------><------>inode->i_op = &ext4_file_inode_operations;
<------><------>inode->i_fop = &ext4_file_operations;
<------><------>ext4_set_aops(inode);
<------><------>err = ext4_add_nondir(handle, dentry, &inode);
<------><------>if (!err)
<------><------><------>ext4_fc_track_create(handle, dentry);
<------>}
<------>if (handle)
<------><------>ext4_journal_stop(handle);
<------>if (!IS_ERR_OR_NULL(inode))
<------><------>iput(inode);
<------>if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
<------><------>goto retry;
<------>return err;
}
static int ext4_mknod(struct inode *dir, struct dentry *dentry,
<------><------> umode_t mode, dev_t rdev)
{
<------>handle_t *handle;
<------>struct inode *inode;
<------>int err, credits, retries = 0;
<------>err = dquot_initialize(dir);
<------>if (err)
<------><------>return err;
<------>credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
<------><------> EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
retry:
<------>inode = ext4_new_inode_start_handle(dir, mode, &dentry->d_name, 0,
<------><------><------><------><------> NULL, EXT4_HT_DIR, credits);
<------>handle = ext4_journal_current_handle();
<------>err = PTR_ERR(inode);
<------>if (!IS_ERR(inode)) {
<------><------>init_special_inode(inode, inode->i_mode, rdev);
<------><------>inode->i_op = &ext4_special_inode_operations;
<------><------>err = ext4_add_nondir(handle, dentry, &inode);
<------><------>if (!err)
<------><------><------>ext4_fc_track_create(handle, dentry);
<------>}
<------>if (handle)
<------><------>ext4_journal_stop(handle);
<------>if (!IS_ERR_OR_NULL(inode))
<------><------>iput(inode);
<------>if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
<------><------>goto retry;
<------>return err;
}
static int ext4_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
{
<------>handle_t *handle;
<------>struct inode *inode;
<------>int err, retries = 0;
<------>err = dquot_initialize(dir);
<------>if (err)
<------><------>return err;
retry:
<------>inode = ext4_new_inode_start_handle(dir, mode,
<------><------><------><------><------> NULL, 0, NULL,
<------><------><------><------><------> EXT4_HT_DIR,
<------><------><------>EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
<------><------><------> 4 + EXT4_XATTR_TRANS_BLOCKS);
<------>handle = ext4_journal_current_handle();
<------>err = PTR_ERR(inode);
<------>if (!IS_ERR(inode)) {
<------><------>inode->i_op = &ext4_file_inode_operations;
<------><------>inode->i_fop = &ext4_file_operations;
<------><------>ext4_set_aops(inode);
<------><------>d_tmpfile(dentry, inode);
<------><------>err = ext4_orphan_add(handle, inode);
<------><------>if (err)
<------><------><------>goto err_unlock_inode;
<------><------>mark_inode_dirty(inode);
<------><------>unlock_new_inode(inode);
<------>}
<------>if (handle)
<------><------>ext4_journal_stop(handle);
<------>if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
<------><------>goto retry;
<------>return err;
err_unlock_inode:
<------>ext4_journal_stop(handle);
<------>unlock_new_inode(inode);
<------>return err;
}
struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
<------><------><------> struct ext4_dir_entry_2 *de,
<------><------><------> int blocksize, int csum_size,
<------><------><------> unsigned int parent_ino, int dotdot_real_len)
{
<------>de->inode = cpu_to_le32(inode->i_ino);
<------>de->name_len = 1;
<------>de->rec_len = ext4_rec_len_to_disk(ext4_dir_rec_len(de->name_len, NULL),
<------><------><------><------><------> blocksize);
<------>strcpy(de->name, ".");
<------>ext4_set_de_type(inode->i_sb, de, S_IFDIR);
<------>de = ext4_next_entry(de, blocksize);
<------>de->inode = cpu_to_le32(parent_ino);
<------>de->name_len = 2;
<------>if (!dotdot_real_len)
<------><------>de->rec_len = ext4_rec_len_to_disk(blocksize -
<------><------><------><------><------>(csum_size + ext4_dir_rec_len(1, NULL)),
<------><------><------><------><------>blocksize);
<------>else
<------><------>de->rec_len = ext4_rec_len_to_disk(
<------><------><------><------><------>ext4_dir_rec_len(de->name_len, NULL),
<------><------><------><------><------>blocksize);
<------>strcpy(de->name, "..");
<------>ext4_set_de_type(inode->i_sb, de, S_IFDIR);
<------>return ext4_next_entry(de, blocksize);
}
int ext4_init_new_dir(handle_t *handle, struct inode *dir,
<------><------><------> struct inode *inode)
{
<------>struct buffer_head *dir_block = NULL;
<------>struct ext4_dir_entry_2 *de;
<------>ext4_lblk_t block = 0;
<------>unsigned int blocksize = dir->i_sb->s_blocksize;
<------>int csum_size = 0;
<------>int err;
<------>if (ext4_has_metadata_csum(dir->i_sb))
<------><------>csum_size = sizeof(struct ext4_dir_entry_tail);
<------>if (ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA)) {
<------><------>err = ext4_try_create_inline_dir(handle, dir, inode);
<------><------>if (err < 0 && err != -ENOSPC)
<------><------><------>goto out;
<------><------>if (!err)
<------><------><------>goto out;
<------>}
<------>inode->i_size = 0;
<------>dir_block = ext4_append(handle, inode, &block);
<------>if (IS_ERR(dir_block))
<------><------>return PTR_ERR(dir_block);
<------>de = (struct ext4_dir_entry_2 *)dir_block->b_data;
<------>ext4_init_dot_dotdot(inode, de, blocksize, csum_size, dir->i_ino, 0);
<------>set_nlink(inode, 2);
<------>if (csum_size)
<------><------>ext4_initialize_dirent_tail(dir_block, blocksize);
<------>BUFFER_TRACE(dir_block, "call ext4_handle_dirty_metadata");
<------>err = ext4_handle_dirty_dirblock(handle, inode, dir_block);
<------>if (err)
<------><------>goto out;
<------>set_buffer_verified(dir_block);
out:
<------>brelse(dir_block);
<------>return err;
}
static int ext4_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
<------>handle_t *handle;
<------>struct inode *inode;
<------>int err, err2 = 0, credits, retries = 0;
<------>if (EXT4_DIR_LINK_MAX(dir))
<------><------>return -EMLINK;
<------>err = dquot_initialize(dir);
<------>if (err)
<------><------>return err;
<------>credits = (EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
<------><------> EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3);
retry:
<------>inode = ext4_new_inode_start_handle(dir, S_IFDIR | mode,
<------><------><------><------><------> &dentry->d_name,
<------><------><------><------><------> 0, NULL, EXT4_HT_DIR, credits);
<------>handle = ext4_journal_current_handle();
<------>err = PTR_ERR(inode);
<------>if (IS_ERR(inode))
<------><------>goto out_stop;
<------>inode->i_op = &ext4_dir_inode_operations;
<------>inode->i_fop = &ext4_dir_operations;
<------>err = ext4_init_new_dir(handle, dir, inode);
<------>if (err)
<------><------>goto out_clear_inode;
<------>err = ext4_mark_inode_dirty(handle, inode);
<------>if (!err)
<------><------>err = ext4_add_entry(handle, dentry, inode);
<------>if (err) {
out_clear_inode:
<------><------>clear_nlink(inode);
<------><------>ext4_orphan_add(handle, inode);
<------><------>unlock_new_inode(inode);
<------><------>err2 = ext4_mark_inode_dirty(handle, inode);
<------><------>if (unlikely(err2))
<------><------><------>err = err2;
<------><------>ext4_journal_stop(handle);
<------><------>iput(inode);
<------><------>goto out_retry;
<------>}
<------>ext4_inc_count(dir);
<------>ext4_update_dx_flag(dir);
<------>err = ext4_mark_inode_dirty(handle, dir);
<------>if (err)
<------><------>goto out_clear_inode;
<------>d_instantiate_new(dentry, inode);
<------>ext4_fc_track_create(handle, dentry);
<------>if (IS_DIRSYNC(dir))
<------><------>ext4_handle_sync(handle);
out_stop:
<------>if (handle)
<------><------>ext4_journal_stop(handle);
out_retry:
<------>if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
<------><------>goto retry;
<------>return err;
}
/*
* routine to check that the specified directory is empty (for rmdir)
*/
bool ext4_empty_dir(struct inode *inode)
{
<------>unsigned int offset;
<------>struct buffer_head *bh;
<------>struct ext4_dir_entry_2 *de;
<------>struct super_block *sb;
<------>if (ext4_has_inline_data(inode)) {
<------><------>int has_inline_data = 1;
<------><------>int ret;
<------><------>ret = empty_inline_dir(inode, &has_inline_data);
<------><------>if (has_inline_data)
<------><------><------>return ret;
<------>}
<------>sb = inode->i_sb;
<------>if (inode->i_size < ext4_dir_rec_len(1, NULL) +
<------><------><------><------><------>ext4_dir_rec_len(2, NULL)) {
<------><------>EXT4_ERROR_INODE(inode, "invalid size");
<------><------>return false;
<------>}
<------>/* The first directory block must not be a hole,
<------> * so treat it as DIRENT_HTREE
<------> */
<------>bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
<------>if (IS_ERR(bh))
<------><------>return false;
<------>de = (struct ext4_dir_entry_2 *) bh->b_data;
<------>if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, bh->b_size, 0,
<------><------><------><------> 0) ||
<------> le32_to_cpu(de->inode) != inode->i_ino || strcmp(".", de->name)) {
<------><------>ext4_warning_inode(inode, "directory missing '.'");
<------><------>brelse(bh);
<------><------>return false;
<------>}
<------>offset = ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
<------>de = ext4_next_entry(de, sb->s_blocksize);
<------>if (ext4_check_dir_entry(inode, NULL, de, bh, bh->b_data, bh->b_size, 0,
<------><------><------><------> offset) ||
<------> le32_to_cpu(de->inode) == 0 || strcmp("..", de->name)) {
<------><------>ext4_warning_inode(inode, "directory missing '..'");
<------><------>brelse(bh);
<------><------>return false;
<------>}
<------>offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
<------>while (offset < inode->i_size) {
<------><------>if (!(offset & (sb->s_blocksize - 1))) {
<------><------><------>unsigned int lblock;
<------><------><------>brelse(bh);
<------><------><------>lblock = offset >> EXT4_BLOCK_SIZE_BITS(sb);
<------><------><------>bh = ext4_read_dirblock(inode, lblock, EITHER);
<------><------><------>if (bh == NULL) {
<------><------><------><------>offset += sb->s_blocksize;
<------><------><------><------>continue;
<------><------><------>}
<------><------><------>if (IS_ERR(bh))
<------><------><------><------>return false;
<------><------>}
<------><------>de = (struct ext4_dir_entry_2 *) (bh->b_data +
<------><------><------><------><------>(offset & (sb->s_blocksize - 1)));
<------><------>if (ext4_check_dir_entry(inode, NULL, de, bh,
<------><------><------><------><------> bh->b_data, bh->b_size, 0, offset)) {
<------><------><------>offset = (offset | (sb->s_blocksize - 1)) + 1;
<------><------><------>continue;
<------><------>}
<------><------>if (le32_to_cpu(de->inode)) {
<------><------><------>brelse(bh);
<------><------><------>return false;
<------><------>}
<------><------>offset += ext4_rec_len_from_disk(de->rec_len, sb->s_blocksize);
<------>}
<------>brelse(bh);
<------>return true;
}
/*
* ext4_orphan_add() links an unlinked or truncated inode into a list of
* such inodes, starting at the superblock, in case we crash before the
* file is closed/deleted, or in case the inode truncate spans multiple
* transactions and the last transaction is not recovered after a crash.
*
* At filesystem recovery time, we walk this list deleting unlinked
* inodes and truncating linked inodes in ext4_orphan_cleanup().
*
* Orphan list manipulation functions must be called under i_mutex unless
* we are just creating the inode or deleting it.
*/
int ext4_orphan_add(handle_t *handle, struct inode *inode)
{
<------>struct super_block *sb = inode->i_sb;
<------>struct ext4_sb_info *sbi = EXT4_SB(sb);
<------>struct ext4_iloc iloc;
<------>int err = 0, rc;
<------>bool dirty = false;
<------>if (!sbi->s_journal || is_bad_inode(inode))
<------><------>return 0;
<------>WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
<------><------> !inode_is_locked(inode));
<------>/*
<------> * Exit early if inode already is on orphan list. This is a big speedup
<------> * since we don't have to contend on the global s_orphan_lock.
<------> */
<------>if (!list_empty(&EXT4_I(inode)->i_orphan))
<------><------>return 0;
<------>/*
<------> * Orphan handling is only valid for files with data blocks
<------> * being truncated, or files being unlinked. Note that we either
<------> * hold i_mutex, or the inode can not be referenced from outside,
<------> * so i_nlink should not be bumped due to race
<------> */
<------>J_ASSERT((S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode) ||
<------><------> S_ISLNK(inode->i_mode)) || inode->i_nlink == 0);
<------>BUFFER_TRACE(sbi->s_sbh, "get_write_access");
<------>err = ext4_journal_get_write_access(handle, sbi->s_sbh);
<------>if (err)
<------><------>goto out;
<------>err = ext4_reserve_inode_write(handle, inode, &iloc);
<------>if (err)
<------><------>goto out;
<------>mutex_lock(&sbi->s_orphan_lock);
<------>/*
<------> * Due to previous errors inode may be already a part of on-disk
<------> * orphan list. If so skip on-disk list modification.
<------> */
<------>if (!NEXT_ORPHAN(inode) || NEXT_ORPHAN(inode) >
<------> (le32_to_cpu(sbi->s_es->s_inodes_count))) {
<------><------>/* Insert this inode at the head of the on-disk orphan list */
<------><------>NEXT_ORPHAN(inode) = le32_to_cpu(sbi->s_es->s_last_orphan);
<------><------>sbi->s_es->s_last_orphan = cpu_to_le32(inode->i_ino);
<------><------>dirty = true;
<------>}
<------>list_add(&EXT4_I(inode)->i_orphan, &sbi->s_orphan);
<------>mutex_unlock(&sbi->s_orphan_lock);
<------>if (dirty) {
<------><------>err = ext4_handle_dirty_super(handle, sb);
<------><------>rc = ext4_mark_iloc_dirty(handle, inode, &iloc);
<------><------>if (!err)
<------><------><------>err = rc;
<------><------>if (err) {
<------><------><------>/*
<------><------><------> * We have to remove inode from in-memory list if
<------><------><------> * addition to on disk orphan list failed. Stray orphan
<------><------><------> * list entries can cause panics at unmount time.
<------><------><------> */
<------><------><------>mutex_lock(&sbi->s_orphan_lock);
<------><------><------>list_del_init(&EXT4_I(inode)->i_orphan);
<------><------><------>mutex_unlock(&sbi->s_orphan_lock);
<------><------>}
<------>} else
<------><------>brelse(iloc.bh);
<------>jbd_debug(4, "superblock will point to %lu\n", inode->i_ino);
<------>jbd_debug(4, "orphan inode %lu will point to %d\n",
<------><------><------>inode->i_ino, NEXT_ORPHAN(inode));
out:
<------>ext4_std_error(sb, err);
<------>return err;
}
/*
* ext4_orphan_del() removes an unlinked or truncated inode from the list
* of such inodes stored on disk, because it is finally being cleaned up.
*/
int ext4_orphan_del(handle_t *handle, struct inode *inode)
{
<------>struct list_head *prev;
<------>struct ext4_inode_info *ei = EXT4_I(inode);
<------>struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
<------>__u32 ino_next;
<------>struct ext4_iloc iloc;
<------>int err = 0;
<------>if (!sbi->s_journal && !(sbi->s_mount_state & EXT4_ORPHAN_FS))
<------><------>return 0;
<------>WARN_ON_ONCE(!(inode->i_state & (I_NEW | I_FREEING)) &&
<------><------> !inode_is_locked(inode));
<------>/* Do this quick check before taking global s_orphan_lock. */
<------>if (list_empty(&ei->i_orphan))
<------><------>return 0;
<------>if (handle) {
<------><------>/* Grab inode buffer early before taking global s_orphan_lock */
<------><------>err = ext4_reserve_inode_write(handle, inode, &iloc);
<------>}
<------>mutex_lock(&sbi->s_orphan_lock);
<------>jbd_debug(4, "remove inode %lu from orphan list\n", inode->i_ino);
<------>prev = ei->i_orphan.prev;
<------>list_del_init(&ei->i_orphan);
<------>/* If we're on an error path, we may not have a valid
<------> * transaction handle with which to update the orphan list on
<------> * disk, but we still need to remove the inode from the linked
<------> * list in memory. */
<------>if (!handle || err) {
<------><------>mutex_unlock(&sbi->s_orphan_lock);
<------><------>goto out_err;
<------>}
<------>ino_next = NEXT_ORPHAN(inode);
<------>if (prev == &sbi->s_orphan) {
<------><------>jbd_debug(4, "superblock will point to %u\n", ino_next);
<------><------>BUFFER_TRACE(sbi->s_sbh, "get_write_access");
<------><------>err = ext4_journal_get_write_access(handle, sbi->s_sbh);
<------><------>if (err) {
<------><------><------>mutex_unlock(&sbi->s_orphan_lock);
<------><------><------>goto out_brelse;
<------><------>}
<------><------>sbi->s_es->s_last_orphan = cpu_to_le32(ino_next);
<------><------>mutex_unlock(&sbi->s_orphan_lock);
<------><------>err = ext4_handle_dirty_super(handle, inode->i_sb);
<------>} else {
<------><------>struct ext4_iloc iloc2;
<------><------>struct inode *i_prev =
<------><------><------>&list_entry(prev, struct ext4_inode_info, i_orphan)->vfs_inode;
<------><------>jbd_debug(4, "orphan inode %lu will point to %u\n",
<------><------><------> i_prev->i_ino, ino_next);
<------><------>err = ext4_reserve_inode_write(handle, i_prev, &iloc2);
<------><------>if (err) {
<------><------><------>mutex_unlock(&sbi->s_orphan_lock);
<------><------><------>goto out_brelse;
<------><------>}
<------><------>NEXT_ORPHAN(i_prev) = ino_next;
<------><------>err = ext4_mark_iloc_dirty(handle, i_prev, &iloc2);
<------><------>mutex_unlock(&sbi->s_orphan_lock);
<------>}
<------>if (err)
<------><------>goto out_brelse;
<------>NEXT_ORPHAN(inode) = 0;
<------>err = ext4_mark_iloc_dirty(handle, inode, &iloc);
out_err:
<------>ext4_std_error(inode->i_sb, err);
<------>return err;
out_brelse:
<------>brelse(iloc.bh);
<------>goto out_err;
}
static int ext4_rmdir(struct inode *dir, struct dentry *dentry)
{
<------>int retval;
<------>struct inode *inode;
<------>struct buffer_head *bh;
<------>struct ext4_dir_entry_2 *de;
<------>handle_t *handle = NULL;
<------>ext4_lblk_t lblk;
<------>if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
<------><------>return -EIO;
<------>/* Initialize quotas before so that eventual writes go in
<------> * separate transaction */
<------>retval = dquot_initialize(dir);
<------>if (retval)
<------><------>return retval;
<------>retval = dquot_initialize(d_inode(dentry));
<------>if (retval)
<------><------>return retval;
<------>retval = -ENOENT;
<------>bh = ext4_find_entry(dir, &dentry->d_name, &de, NULL, &lblk);
<------>if (IS_ERR(bh))
<------><------>return PTR_ERR(bh);
<------>if (!bh)
<------><------>goto end_rmdir;
<------>inode = d_inode(dentry);
<------>retval = -EFSCORRUPTED;
<------>if (le32_to_cpu(de->inode) != inode->i_ino)
<------><------>goto end_rmdir;
<------>retval = -ENOTEMPTY;
<------>if (!ext4_empty_dir(inode))
<------><------>goto end_rmdir;
<------>handle = ext4_journal_start(dir, EXT4_HT_DIR,
<------><------><------><------> EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
<------>if (IS_ERR(handle)) {
<------><------>retval = PTR_ERR(handle);
<------><------>handle = NULL;
<------><------>goto end_rmdir;
<------>}
<------>if (IS_DIRSYNC(dir))
<------><------>ext4_handle_sync(handle);
<------>retval = ext4_delete_entry(handle, dir, de, lblk, bh);
<------>if (retval)
<------><------>goto end_rmdir;
<------>if (!EXT4_DIR_LINK_EMPTY(inode))
<------><------>ext4_warning_inode(inode,
<------><------><------> "empty directory '%.*s' has too many links (%u)",
<------><------><------> dentry->d_name.len, dentry->d_name.name,
<------><------><------> inode->i_nlink);
<------>inode_inc_iversion(inode);
<------>clear_nlink(inode);
<------>/* There's no need to set i_disksize: the fact that i_nlink is
<------> * zero will ensure that the right thing happens during any
<------> * recovery. */
<------>inode->i_size = 0;
<------>ext4_orphan_add(handle, inode);
<------>inode->i_ctime = dir->i_ctime = dir->i_mtime = current_time(inode);
<------>retval = ext4_mark_inode_dirty(handle, inode);
<------>if (retval)
<------><------>goto end_rmdir;
<------>ext4_dec_count(dir);
<------>ext4_update_dx_flag(dir);
<------>ext4_fc_track_unlink(handle, dentry);
<------>retval = ext4_mark_inode_dirty(handle, dir);
#ifdef CONFIG_UNICODE
<------>/* VFS negative dentries are incompatible with Encoding and
<------> * Case-insensitiveness. Eventually we'll want avoid
<------> * invalidating the dentries here, alongside with returning the
<------> * negative dentries at ext4_lookup(), when it is better
<------> * supported by the VFS for the CI case.
<------> */
<------>if (IS_CASEFOLDED(dir))
<------><------>d_invalidate(dentry);
#endif
end_rmdir:
<------>brelse(bh);
<------>if (handle)
<------><------>ext4_journal_stop(handle);
<------>return retval;
}
int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
<------><------> struct inode *inode)
{
<------>int retval = -ENOENT;
<------>struct buffer_head *bh;
<------>struct ext4_dir_entry_2 *de;
<------>int skip_remove_dentry = 0;
<------>ext4_lblk_t lblk;
<------>bh = ext4_find_entry(dir, d_name, &de, NULL, &lblk);
<------>if (IS_ERR(bh))
<------><------>return PTR_ERR(bh);
<------>if (!bh)
<------><------>return -ENOENT;
<------>if (le32_to_cpu(de->inode) != inode->i_ino) {
<------><------>/*
<------><------> * It's okay if we find dont find dentry which matches
<------><------> * the inode. That's because it might have gotten
<------><------> * renamed to a different inode number
<------><------> */
<------><------>if (EXT4_SB(inode->i_sb)->s_mount_state & EXT4_FC_REPLAY)
<------><------><------>skip_remove_dentry = 1;
<------><------>else
<------><------><------>goto out;
<------>}
<------>if (IS_DIRSYNC(dir))
<------><------>ext4_handle_sync(handle);
<------>if (!skip_remove_dentry) {
<------><------>retval = ext4_delete_entry(handle, dir, de, lblk, bh);
<------><------>if (retval)
<------><------><------>goto out;
<------><------>dir->i_ctime = dir->i_mtime = current_time(dir);
<------><------>ext4_update_dx_flag(dir);
<------><------>retval = ext4_mark_inode_dirty(handle, dir);
<------><------>if (retval)
<------><------><------>goto out;
<------>} else {
<------><------>retval = 0;
<------>}
<------>if (inode->i_nlink == 0)
<------><------>ext4_warning_inode(inode, "Deleting file '%.*s' with no links",
<------><------><------><------> d_name->len, d_name->name);
<------>else
<------><------>drop_nlink(inode);
<------>if (!inode->i_nlink)
<------><------>ext4_orphan_add(handle, inode);
<------>inode->i_ctime = current_time(inode);
<------>retval = ext4_mark_inode_dirty(handle, inode);
out:
<------>brelse(bh);
<------>return retval;
}
static int ext4_unlink(struct inode *dir, struct dentry *dentry)
{
<------>handle_t *handle;
<------>int retval;
<------>if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
<------><------>return -EIO;
<------>trace_ext4_unlink_enter(dir, dentry);
<------>/*
<------> * Initialize quotas before so that eventual writes go
<------> * in separate transaction
<------> */
<------>retval = dquot_initialize(dir);
<------>if (retval)
<------><------>goto out_trace;
<------>retval = dquot_initialize(d_inode(dentry));
<------>if (retval)
<------><------>goto out_trace;
<------>handle = ext4_journal_start(dir, EXT4_HT_DIR,
<------><------><------><------> EXT4_DATA_TRANS_BLOCKS(dir->i_sb));
<------>if (IS_ERR(handle)) {
<------><------>retval = PTR_ERR(handle);
<------><------>goto out_trace;
<------>}
<------>retval = __ext4_unlink(handle, dir, &dentry->d_name, d_inode(dentry));
<------>if (!retval)
<------><------>ext4_fc_track_unlink(handle, dentry);
#ifdef CONFIG_UNICODE
<------>/* VFS negative dentries are incompatible with Encoding and
<------> * Case-insensitiveness. Eventually we'll want avoid
<------> * invalidating the dentries here, alongside with returning the
<------> * negative dentries at ext4_lookup(), when it is better
<------> * supported by the VFS for the CI case.
<------> */
<------>if (IS_CASEFOLDED(dir))
<------><------>d_invalidate(dentry);
#endif
<------>if (handle)
<------><------>ext4_journal_stop(handle);
out_trace:
<------>trace_ext4_unlink_exit(dentry, retval);
<------>return retval;
}
static int ext4_symlink(struct inode *dir,
<------><------><------>struct dentry *dentry, const char *symname)
{
<------>handle_t *handle;
<------>struct inode *inode;
<------>int err, len = strlen(symname);
<------>int credits;
<------>struct fscrypt_str disk_link;
<------>if (unlikely(ext4_forced_shutdown(EXT4_SB(dir->i_sb))))
<------><------>return -EIO;
<------>err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
<------><------><------><------> &disk_link);
<------>if (err)
<------><------>return err;
<------>err = dquot_initialize(dir);
<------>if (err)
<------><------>return err;
<------>if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
<------><------>/*
<------><------> * For non-fast symlinks, we just allocate inode and put it on
<------><------> * orphan list in the first transaction => we need bitmap,
<------><------> * group descriptor, sb, inode block, quota blocks, and
<------><------> * possibly selinux xattr blocks.
<------><------> */
<------><------>credits = 4 + EXT4_MAXQUOTAS_INIT_BLOCKS(dir->i_sb) +
<------><------><------> EXT4_XATTR_TRANS_BLOCKS;
<------>} else {
<------><------>/*
<------><------> * Fast symlink. We have to add entry to directory
<------><------> * (EXT4_DATA_TRANS_BLOCKS + EXT4_INDEX_EXTRA_TRANS_BLOCKS),
<------><------> * allocate new inode (bitmap, group descriptor, inode block,
<------><------> * quota blocks, sb is already counted in previous macros).
<------><------> */
<------><------>credits = EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
<------><------><------> EXT4_INDEX_EXTRA_TRANS_BLOCKS + 3;
<------>}
<------>inode = ext4_new_inode_start_handle(dir, S_IFLNK|S_IRWXUGO,
<------><------><------><------><------> &dentry->d_name, 0, NULL,
<------><------><------><------><------> EXT4_HT_DIR, credits);
<------>handle = ext4_journal_current_handle();
<------>if (IS_ERR(inode)) {
<------><------>if (handle)
<------><------><------>ext4_journal_stop(handle);
<------><------>return PTR_ERR(inode);
<------>}
<------>if (IS_ENCRYPTED(inode)) {
<------><------>err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
<------><------>if (err)
<------><------><------>goto err_drop_inode;
<------><------>inode->i_op = &ext4_encrypted_symlink_inode_operations;
<------>}
<------>if ((disk_link.len > EXT4_N_BLOCKS * 4)) {
<------><------>if (!IS_ENCRYPTED(inode))
<------><------><------>inode->i_op = &ext4_symlink_inode_operations;
<------><------>inode_nohighmem(inode);
<------><------>ext4_set_aops(inode);
<------><------>/*
<------><------> * We cannot call page_symlink() with transaction started
<------><------> * because it calls into ext4_write_begin() which can wait
<------><------> * for transaction commit if we are running out of space
<------><------> * and thus we deadlock. So we have to stop transaction now
<------><------> * and restart it when symlink contents is written.
<------><------> *
<------><------> * To keep fs consistent in case of crash, we have to put inode
<------><------> * to orphan list in the mean time.
<------><------> */
<------><------>drop_nlink(inode);
<------><------>err = ext4_orphan_add(handle, inode);
<------><------>if (handle)
<------><------><------>ext4_journal_stop(handle);
<------><------>handle = NULL;
<------><------>if (err)
<------><------><------>goto err_drop_inode;
<------><------>err = __page_symlink(inode, disk_link.name, disk_link.len, 1);
<------><------>if (err)
<------><------><------>goto err_drop_inode;
<------><------>/*
<------><------> * Now inode is being linked into dir (EXT4_DATA_TRANS_BLOCKS
<------><------> * + EXT4_INDEX_EXTRA_TRANS_BLOCKS), inode is also modified
<------><------> */
<------><------>handle = ext4_journal_start(dir, EXT4_HT_DIR,
<------><------><------><------>EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
<------><------><------><------>EXT4_INDEX_EXTRA_TRANS_BLOCKS + 1);
<------><------>if (IS_ERR(handle)) {
<------><------><------>err = PTR_ERR(handle);
<------><------><------>handle = NULL;
<------><------><------>goto err_drop_inode;
<------><------>}
<------><------>set_nlink(inode, 1);
<------><------>err = ext4_orphan_del(handle, inode);
<------><------>if (err)
<------><------><------>goto err_drop_inode;
<------>} else {
<------><------>/* clear the extent format for fast symlink */
<------><------>ext4_clear_inode_flag(inode, EXT4_INODE_EXTENTS);
<------><------>if (!IS_ENCRYPTED(inode)) {
<------><------><------>inode->i_op = &ext4_fast_symlink_inode_operations;
<------><------><------>inode->i_link = (char *)&EXT4_I(inode)->i_data;
<------><------>}
<------><------>memcpy((char *)&EXT4_I(inode)->i_data, disk_link.name,
<------><------> disk_link.len);
<------><------>inode->i_size = disk_link.len - 1;
<------>}
<------>EXT4_I(inode)->i_disksize = inode->i_size;
<------>err = ext4_add_nondir(handle, dentry, &inode);
<------>if (handle)
<------><------>ext4_journal_stop(handle);
<------>if (inode)
<------><------>iput(inode);
<------>goto out_free_encrypted_link;
err_drop_inode:
<------>if (handle)
<------><------>ext4_journal_stop(handle);
<------>clear_nlink(inode);
<------>unlock_new_inode(inode);
<------>iput(inode);
out_free_encrypted_link:
<------>if (disk_link.name != (unsigned char *)symname)
<------><------>kfree(disk_link.name);
<------>return err;
}
int __ext4_link(struct inode *dir, struct inode *inode, struct dentry *dentry)
{
<------>handle_t *handle;
<------>int err, retries = 0;
retry:
<------>handle = ext4_journal_start(dir, EXT4_HT_DIR,
<------><------>(EXT4_DATA_TRANS_BLOCKS(dir->i_sb) +
<------><------> EXT4_INDEX_EXTRA_TRANS_BLOCKS) + 1);
<------>if (IS_ERR(handle))
<------><------>return PTR_ERR(handle);
<------>if (IS_DIRSYNC(dir))
<------><------>ext4_handle_sync(handle);
<------>inode->i_ctime = current_time(inode);
<------>ext4_inc_count(inode);
<------>ihold(inode);
<------>err = ext4_add_entry(handle, dentry, inode);
<------>if (!err) {
<------><------>err = ext4_mark_inode_dirty(handle, inode);
<------><------>/* this can happen only for tmpfile being
<------><------> * linked the first time
<------><------> */
<------><------>if (inode->i_nlink == 1)
<------><------><------>ext4_orphan_del(handle, inode);
<------><------>d_instantiate(dentry, inode);
<------><------>ext4_fc_track_link(handle, dentry);
<------>} else {
<------><------>drop_nlink(inode);
<------><------>iput(inode);
<------>}
<------>ext4_journal_stop(handle);
<------>if (err == -ENOSPC && ext4_should_retry_alloc(dir->i_sb, &retries))
<------><------>goto retry;
<------>return err;
}
static int ext4_link(struct dentry *old_dentry,
<------><------> struct inode *dir, struct dentry *dentry)
{
<------>struct inode *inode = d_inode(old_dentry);
<------>int err;
<------>if (inode->i_nlink >= EXT4_LINK_MAX)
<------><------>return -EMLINK;
<------>err = fscrypt_prepare_link(old_dentry, dir, dentry);
<------>if (err)
<------><------>return err;
<------>if ((ext4_test_inode_flag(dir, EXT4_INODE_PROJINHERIT)) &&
<------> (!projid_eq(EXT4_I(dir)->i_projid,
<------><------><------>EXT4_I(old_dentry->d_inode)->i_projid)))
<------><------>return -EXDEV;
<------>err = dquot_initialize(dir);
<------>if (err)
<------><------>return err;
<------>return __ext4_link(dir, inode, dentry);
}
/*
* Try to find buffer head where contains the parent block.
* It should be the inode block if it is inlined or the 1st block
* if it is a normal dir.
*/
static struct buffer_head *ext4_get_first_dir_block(handle_t *handle,
<------><------><------><------><------>struct inode *inode,
<------><------><------><------><------>int *retval,
<------><------><------><------><------>struct ext4_dir_entry_2 **parent_de,
<------><------><------><------><------>int *inlined)
{
<------>struct buffer_head *bh;
<------>if (!ext4_has_inline_data(inode)) {
<------><------>/* The first directory block must not be a hole, so
<------><------> * treat it as DIRENT_HTREE
<------><------> */
<------><------>bh = ext4_read_dirblock(inode, 0, DIRENT_HTREE);
<------><------>if (IS_ERR(bh)) {
<------><------><------>*retval = PTR_ERR(bh);
<------><------><------>return NULL;
<------><------>}
<------><------>*parent_de = ext4_next_entry(
<------><------><------><------><------>(struct ext4_dir_entry_2 *)bh->b_data,
<------><------><------><------><------>inode->i_sb->s_blocksize);
<------><------>return bh;
<------>}
<------>*inlined = 1;
<------>return ext4_get_first_inline_block(inode, parent_de, retval);
}
struct ext4_renament {
<------>struct inode *dir;
<------>struct dentry *dentry;
<------>struct inode *inode;
<------>bool is_dir;
<------>int dir_nlink_delta;
<------>/* entry for "dentry" */
<------>ext4_lblk_t lblk;
<------>struct buffer_head *bh;
<------>struct ext4_dir_entry_2 *de;
<------>int inlined;
<------>/* entry for ".." in inode if it's a directory */
<------>struct buffer_head *dir_bh;
<------>struct ext4_dir_entry_2 *parent_de;
<------>int dir_inlined;
};
static int ext4_rename_dir_prepare(handle_t *handle, struct ext4_renament *ent)
{
<------>int retval;
<------>ent->dir_bh = ext4_get_first_dir_block(handle, ent->inode,
<------><------><------><------><------> &retval, &ent->parent_de,
<------><------><------><------><------> &ent->dir_inlined);
<------>if (!ent->dir_bh)
<------><------>return retval;
<------>if (le32_to_cpu(ent->parent_de->inode) != ent->dir->i_ino)
<------><------>return -EFSCORRUPTED;
<------>BUFFER_TRACE(ent->dir_bh, "get_write_access");
<------>return ext4_journal_get_write_access(handle, ent->dir_bh);
}
static int ext4_rename_dir_finish(handle_t *handle, struct ext4_renament *ent,
<------><------><------><------> unsigned dir_ino)
{
<------>int retval;
<------>ent->parent_de->inode = cpu_to_le32(dir_ino);
<------>BUFFER_TRACE(ent->dir_bh, "call ext4_handle_dirty_metadata");
<------>if (!ent->dir_inlined) {
<------><------>if (is_dx(ent->inode)) {
<------><------><------>retval = ext4_handle_dirty_dx_node(handle,
<------><------><------><------><------><------><------> ent->inode,
<------><------><------><------><------><------><------> ent->dir_bh);
<------><------>} else {
<------><------><------>retval = ext4_handle_dirty_dirblock(handle, ent->inode,
<------><------><------><------><------><------><------> ent->dir_bh);
<------><------>}
<------>} else {
<------><------>retval = ext4_mark_inode_dirty(handle, ent->inode);
<------>}
<------>if (retval) {
<------><------>ext4_std_error(ent->dir->i_sb, retval);
<------><------>return retval;
<------>}
<------>return 0;
}
static int ext4_setent(handle_t *handle, struct ext4_renament *ent,
<------><------> unsigned ino, unsigned file_type)
{
<------>int retval, retval2;
<------>BUFFER_TRACE(ent->bh, "get write access");
<------>retval = ext4_journal_get_write_access(handle, ent->bh);
<------>if (retval)
<------><------>return retval;
<------>ent->de->inode = cpu_to_le32(ino);
<------>if (ext4_has_feature_filetype(ent->dir->i_sb))
<------><------>ent->de->file_type = file_type;
<------>inode_inc_iversion(ent->dir);
<------>ent->dir->i_ctime = ent->dir->i_mtime =
<------><------>current_time(ent->dir);
<------>retval = ext4_mark_inode_dirty(handle, ent->dir);
<------>BUFFER_TRACE(ent->bh, "call ext4_handle_dirty_metadata");
<------>if (!ent->inlined) {
<------><------>retval2 = ext4_handle_dirty_dirblock(handle, ent->dir, ent->bh);
<------><------>if (unlikely(retval2)) {
<------><------><------>ext4_std_error(ent->dir->i_sb, retval2);
<------><------><------>return retval2;
<------><------>}
<------>}
<------>return retval;
}
static void ext4_resetent(handle_t *handle, struct ext4_renament *ent,
<------><------><------> unsigned ino, unsigned file_type)
{
<------>struct ext4_renament old = *ent;
<------>int retval = 0;
<------>/*
<------> * old->de could have moved from under us during make indexed dir,
<------> * so the old->de may no longer valid and need to find it again
<------> * before reset old inode info.
<------> */
<------>old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL,
<------><------><------><------> NULL);
<------>if (IS_ERR(old.bh))
<------><------>retval = PTR_ERR(old.bh);
<------>if (!old.bh)
<------><------>retval = -ENOENT;
<------>if (retval) {
<------><------>ext4_std_error(old.dir->i_sb, retval);
<------><------>return;
<------>}
<------>ext4_setent(handle, &old, ino, file_type);
<------>brelse(old.bh);
}
static int ext4_find_delete_entry(handle_t *handle, struct inode *dir,
<------><------><------><------> const struct qstr *d_name)
{
<------>int retval = -ENOENT;
<------>struct buffer_head *bh;
<------>struct ext4_dir_entry_2 *de;
<------>ext4_lblk_t lblk;
<------>bh = ext4_find_entry(dir, d_name, &de, NULL, &lblk);
<------>if (IS_ERR(bh))
<------><------>return PTR_ERR(bh);
<------>if (bh) {
<------><------>retval = ext4_delete_entry(handle, dir, de, lblk, bh);
<------><------>brelse(bh);
<------>}
<------>return retval;
}
static void ext4_rename_delete(handle_t *handle, struct ext4_renament *ent,
<------><------><------> int force_reread)
{
<------>int retval;
<------>/*
<------> * ent->de could have moved from under us during htree split, so make
<------> * sure that we are deleting the right entry. We might also be pointing
<------> * to a stale entry in the unused part of ent->bh so just checking inum
<------> * and the name isn't enough.
<------> */
<------>if (le32_to_cpu(ent->de->inode) != ent->inode->i_ino ||
<------> ent->de->name_len != ent->dentry->d_name.len ||
<------> strncmp(ent->de->name, ent->dentry->d_name.name,
<------><------> ent->de->name_len) ||
<------> force_reread) {
<------><------>retval = ext4_find_delete_entry(handle, ent->dir,
<------><------><------><------><------><------>&ent->dentry->d_name);
<------>} else {
<------><------>retval = ext4_delete_entry(handle, ent->dir, ent->de,
<------><------><------><------><------><------>ent->lblk, ent->bh);
<------><------>if (retval == -ENOENT) {
<------><------><------>retval = ext4_find_delete_entry(handle, ent->dir,
<------><------><------><------><------><------><------>&ent->dentry->d_name);
<------><------>}
<------>}
<------>if (retval) {
<------><------>ext4_warning_inode(ent->dir,
<------><------><------><------> "Deleting old file: nlink %d, error=%d",
<------><------><------><------> ent->dir->i_nlink, retval);
<------>}
}
static void ext4_update_dir_count(handle_t *handle, struct ext4_renament *ent)
{
<------>if (ent->dir_nlink_delta) {
<------><------>if (ent->dir_nlink_delta == -1)
<------><------><------>ext4_dec_count(ent->dir);
<------><------>else
<------><------><------>ext4_inc_count(ent->dir);
<------><------>ext4_mark_inode_dirty(handle, ent->dir);
<------>}
}
static struct inode *ext4_whiteout_for_rename(struct ext4_renament *ent,
<------><------><------><------><------> int credits, handle_t **h)
{
<------>struct inode *wh;
<------>handle_t *handle;
<------>int retries = 0;
<------>/*
<------> * for inode block, sb block, group summaries,
<------> * and inode bitmap
<------> */
<------>credits += (EXT4_MAXQUOTAS_TRANS_BLOCKS(ent->dir->i_sb) +
<------><------> EXT4_XATTR_TRANS_BLOCKS + 4);
retry:
<------>wh = ext4_new_inode_start_handle(ent->dir, S_IFCHR | WHITEOUT_MODE,
<------><------><------><------><------> &ent->dentry->d_name, 0, NULL,
<------><------><------><------><------> EXT4_HT_DIR, credits);
<------>handle = ext4_journal_current_handle();
<------>if (IS_ERR(wh)) {
<------><------>if (handle)
<------><------><------>ext4_journal_stop(handle);
<------><------>if (PTR_ERR(wh) == -ENOSPC &&
<------><------> ext4_should_retry_alloc(ent->dir->i_sb, &retries))
<------><------><------>goto retry;
<------>} else {
<------><------>*h = handle;
<------><------>init_special_inode(wh, wh->i_mode, WHITEOUT_DEV);
<------><------>wh->i_op = &ext4_special_inode_operations;
<------>}
<------>return wh;
}
/*
* Anybody can rename anything with this: the permission checks are left to the
* higher-level routines.
*
* n.b. old_{dentry,inode) refers to the source dentry/inode
* while new_{dentry,inode) refers to the destination dentry/inode
* This comes from rename(const char *oldpath, const char *newpath)
*/
static int ext4_rename(struct inode *old_dir, struct dentry *old_dentry,
<------><------> struct inode *new_dir, struct dentry *new_dentry,
<------><------> unsigned int flags)
{
<------>handle_t *handle = NULL;
<------>struct ext4_renament old = {
<------><------>.dir = old_dir,
<------><------>.dentry = old_dentry,
<------><------>.inode = d_inode(old_dentry),
<------>};
<------>struct ext4_renament new = {
<------><------>.dir = new_dir,
<------><------>.dentry = new_dentry,
<------><------>.inode = d_inode(new_dentry),
<------>};
<------>int force_reread;
<------>int retval;
<------>struct inode *whiteout = NULL;
<------>int credits;
<------>u8 old_file_type;
<------>if (new.inode && new.inode->i_nlink == 0) {
<------><------>EXT4_ERROR_INODE(new.inode,
<------><------><------><------> "target of rename is already freed");
<------><------>return -EFSCORRUPTED;
<------>}
<------>if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT)) &&
<------> (!projid_eq(EXT4_I(new_dir)->i_projid,
<------><------><------>EXT4_I(old_dentry->d_inode)->i_projid)))
<------><------>return -EXDEV;
<------>retval = dquot_initialize(old.dir);
<------>if (retval)
<------><------>return retval;
<------>retval = dquot_initialize(new.dir);
<------>if (retval)
<------><------>return retval;
<------>/* Initialize quotas before so that eventual writes go
<------> * in separate transaction */
<------>if (new.inode) {
<------><------>retval = dquot_initialize(new.inode);
<------><------>if (retval)
<------><------><------>return retval;
<------>}
<------>old.bh = ext4_find_entry(old.dir, &old.dentry->d_name, &old.de, NULL,
<------><------><------><------>&old.lblk);
<------>if (IS_ERR(old.bh))
<------><------>return PTR_ERR(old.bh);
<------>/*
<------> * Check for inode number is _not_ due to possible IO errors.
<------> * We might rmdir the source, keep it as pwd of some process
<------> * and merrily kill the link to whatever was created under the
<------> * same name. Goodbye sticky bit ;-<
<------> */
<------>retval = -ENOENT;
<------>if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
<------><------>goto release_bh;
<------>new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
<------><------><------><------> &new.de, &new.inlined, NULL);
<------>if (IS_ERR(new.bh)) {
<------><------>retval = PTR_ERR(new.bh);
<------><------>new.bh = NULL;
<------><------>goto release_bh;
<------>}
<------>if (new.bh) {
<------><------>if (!new.inode) {
<------><------><------>brelse(new.bh);
<------><------><------>new.bh = NULL;
<------><------>}
<------>}
<------>if (new.inode && !test_opt(new.dir->i_sb, NO_AUTO_DA_ALLOC))
<------><------>ext4_alloc_da_blocks(old.inode);
<------>credits = (2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
<------><------> EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2);
<------>if (!(flags & RENAME_WHITEOUT)) {
<------><------>handle = ext4_journal_start(old.dir, EXT4_HT_DIR, credits);
<------><------>if (IS_ERR(handle)) {
<------><------><------>retval = PTR_ERR(handle);
<------><------><------>goto release_bh;
<------><------>}
<------>} else {
<------><------>whiteout = ext4_whiteout_for_rename(&old, credits, &handle);
<------><------>if (IS_ERR(whiteout)) {
<------><------><------>retval = PTR_ERR(whiteout);
<------><------><------>goto release_bh;
<------><------>}
<------>}
<------>old_file_type = old.de->file_type;
<------>if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
<------><------>ext4_handle_sync(handle);
<------>if (S_ISDIR(old.inode->i_mode)) {
<------><------>if (new.inode) {
<------><------><------>retval = -ENOTEMPTY;
<------><------><------>if (!ext4_empty_dir(new.inode))
<------><------><------><------>goto end_rename;
<------><------>} else {
<------><------><------>retval = -EMLINK;
<------><------><------>if (new.dir != old.dir && EXT4_DIR_LINK_MAX(new.dir))
<------><------><------><------>goto end_rename;
<------><------>}
<------><------>retval = ext4_rename_dir_prepare(handle, &old);
<------><------>if (retval)
<------><------><------>goto end_rename;
<------>}
<------>/*
<------> * If we're renaming a file within an inline_data dir and adding or
<------> * setting the new dirent causes a conversion from inline_data to
<------> * extents/blockmap, we need to force the dirent delete code to
<------> * re-read the directory, or else we end up trying to delete a dirent
<------> * from what is now the extent tree root (or a block map).
<------> */
<------>force_reread = (new.dir->i_ino == old.dir->i_ino &&
<------><------><------>ext4_test_inode_flag(new.dir, EXT4_INODE_INLINE_DATA));
<------>if (whiteout) {
<------><------>/*
<------><------> * Do this before adding a new entry, so the old entry is sure
<------><------> * to be still pointing to the valid old entry.
<------><------> */
<------><------>retval = ext4_setent(handle, &old, whiteout->i_ino,
<------><------><------><------> EXT4_FT_CHRDEV);
<------><------>if (retval)
<------><------><------>goto end_rename;
<------><------>retval = ext4_mark_inode_dirty(handle, whiteout);
<------><------>if (unlikely(retval))
<------><------><------>goto end_rename;
<------>}
<------>if (!new.bh) {
<------><------>retval = ext4_add_entry(handle, new.dentry, old.inode);
<------><------>if (retval)
<------><------><------>goto end_rename;
<------>} else {
<------><------>retval = ext4_setent(handle, &new,
<------><------><------><------> old.inode->i_ino, old_file_type);
<------><------>if (retval)
<------><------><------>goto end_rename;
<------>}
<------>if (force_reread)
<------><------>force_reread = !ext4_test_inode_flag(new.dir,
<------><------><------><------><------><------> EXT4_INODE_INLINE_DATA);
<------>/*
<------> * Like most other Unix systems, set the ctime for inodes on a
<------> * rename.
<------> */
<------>old.inode->i_ctime = current_time(old.inode);
<------>retval = ext4_mark_inode_dirty(handle, old.inode);
<------>if (unlikely(retval))
<------><------>goto end_rename;
<------>if (!whiteout) {
<------><------>/*
<------><------> * ok, that's it
<------><------> */
<------><------>ext4_rename_delete(handle, &old, force_reread);
<------>}
<------>if (new.inode) {
<------><------>ext4_dec_count(new.inode);
<------><------>new.inode->i_ctime = current_time(new.inode);
<------>}
<------>old.dir->i_ctime = old.dir->i_mtime = current_time(old.dir);
<------>ext4_update_dx_flag(old.dir);
<------>if (old.dir_bh) {
<------><------>retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
<------><------>if (retval)
<------><------><------>goto end_rename;
<------><------>ext4_dec_count(old.dir);
<------><------>if (new.inode) {
<------><------><------>/* checked ext4_empty_dir above, can't have another
<------><------><------> * parent, ext4_dec_count() won't work for many-linked
<------><------><------> * dirs */
<------><------><------>clear_nlink(new.inode);
<------><------>} else {
<------><------><------>ext4_inc_count(new.dir);
<------><------><------>ext4_update_dx_flag(new.dir);
<------><------><------>retval = ext4_mark_inode_dirty(handle, new.dir);
<------><------><------>if (unlikely(retval))
<------><------><------><------>goto end_rename;
<------><------>}
<------>}
<------>retval = ext4_mark_inode_dirty(handle, old.dir);
<------>if (unlikely(retval))
<------><------>goto end_rename;
<------>if (S_ISDIR(old.inode->i_mode)) {
<------><------>/*
<------><------> * We disable fast commits here that's because the
<------><------> * replay code is not yet capable of changing dot dot
<------><------> * dirents in directories.
<------><------> */
<------><------>ext4_fc_mark_ineligible(old.inode->i_sb,
<------><------><------>EXT4_FC_REASON_RENAME_DIR);
<------>} else {
<------><------>if (new.inode)
<------><------><------>ext4_fc_track_unlink(handle, new.dentry);
<------><------>__ext4_fc_track_link(handle, old.inode, new.dentry);
<------><------>__ext4_fc_track_unlink(handle, old.inode, old.dentry);
<------><------>if (whiteout)
<------><------><------>__ext4_fc_track_create(handle, whiteout, old.dentry);
<------>}
<------>if (new.inode) {
<------><------>retval = ext4_mark_inode_dirty(handle, new.inode);
<------><------>if (unlikely(retval))
<------><------><------>goto end_rename;
<------><------>if (!new.inode->i_nlink)
<------><------><------>ext4_orphan_add(handle, new.inode);
<------>}
<------>retval = 0;
end_rename:
<------>if (whiteout) {
<------><------>if (retval) {
<------><------><------>ext4_resetent(handle, &old,
<------><------><------><------> old.inode->i_ino, old_file_type);
<------><------><------>drop_nlink(whiteout);
<------><------><------>ext4_orphan_add(handle, whiteout);
<------><------>}
<------><------>unlock_new_inode(whiteout);
<------><------>ext4_journal_stop(handle);
<------><------>iput(whiteout);
<------>} else {
<------><------>ext4_journal_stop(handle);
<------>}
release_bh:
<------>brelse(old.dir_bh);
<------>brelse(old.bh);
<------>brelse(new.bh);
<------>return retval;
}
static int ext4_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
<------><------><------> struct inode *new_dir, struct dentry *new_dentry)
{
<------>handle_t *handle = NULL;
<------>struct ext4_renament old = {
<------><------>.dir = old_dir,
<------><------>.dentry = old_dentry,
<------><------>.inode = d_inode(old_dentry),
<------>};
<------>struct ext4_renament new = {
<------><------>.dir = new_dir,
<------><------>.dentry = new_dentry,
<------><------>.inode = d_inode(new_dentry),
<------>};
<------>u8 new_file_type;
<------>int retval;
<------>struct timespec64 ctime;
<------>if ((ext4_test_inode_flag(new_dir, EXT4_INODE_PROJINHERIT) &&
<------> !projid_eq(EXT4_I(new_dir)->i_projid,
<------><------><------>EXT4_I(old_dentry->d_inode)->i_projid)) ||
<------> (ext4_test_inode_flag(old_dir, EXT4_INODE_PROJINHERIT) &&
<------> !projid_eq(EXT4_I(old_dir)->i_projid,
<------><------><------>EXT4_I(new_dentry->d_inode)->i_projid)))
<------><------>return -EXDEV;
<------>retval = dquot_initialize(old.dir);
<------>if (retval)
<------><------>return retval;
<------>retval = dquot_initialize(new.dir);
<------>if (retval)
<------><------>return retval;
<------>old.bh = ext4_find_entry(old.dir, &old.dentry->d_name,
<------><------><------><------> &old.de, &old.inlined, NULL);
<------>if (IS_ERR(old.bh))
<------><------>return PTR_ERR(old.bh);
<------>/*
<------> * Check for inode number is _not_ due to possible IO errors.
<------> * We might rmdir the source, keep it as pwd of some process
<------> * and merrily kill the link to whatever was created under the
<------> * same name. Goodbye sticky bit ;-<
<------> */
<------>retval = -ENOENT;
<------>if (!old.bh || le32_to_cpu(old.de->inode) != old.inode->i_ino)
<------><------>goto end_rename;
<------>new.bh = ext4_find_entry(new.dir, &new.dentry->d_name,
<------><------><------><------> &new.de, &new.inlined, NULL);
<------>if (IS_ERR(new.bh)) {
<------><------>retval = PTR_ERR(new.bh);
<------><------>new.bh = NULL;
<------><------>goto end_rename;
<------>}
<------>/* RENAME_EXCHANGE case: old *and* new must both exist */
<------>if (!new.bh || le32_to_cpu(new.de->inode) != new.inode->i_ino)
<------><------>goto end_rename;
<------>handle = ext4_journal_start(old.dir, EXT4_HT_DIR,
<------><------>(2 * EXT4_DATA_TRANS_BLOCKS(old.dir->i_sb) +
<------><------> 2 * EXT4_INDEX_EXTRA_TRANS_BLOCKS + 2));
<------>if (IS_ERR(handle)) {
<------><------>retval = PTR_ERR(handle);
<------><------>handle = NULL;
<------><------>goto end_rename;
<------>}
<------>if (IS_DIRSYNC(old.dir) || IS_DIRSYNC(new.dir))
<------><------>ext4_handle_sync(handle);
<------>if (S_ISDIR(old.inode->i_mode)) {
<------><------>old.is_dir = true;
<------><------>retval = ext4_rename_dir_prepare(handle, &old);
<------><------>if (retval)
<------><------><------>goto end_rename;
<------>}
<------>if (S_ISDIR(new.inode->i_mode)) {
<------><------>new.is_dir = true;
<------><------>retval = ext4_rename_dir_prepare(handle, &new);
<------><------>if (retval)
<------><------><------>goto end_rename;
<------>}
<------>/*
<------> * Other than the special case of overwriting a directory, parents'
<------> * nlink only needs to be modified if this is a cross directory rename.
<------> */
<------>if (old.dir != new.dir && old.is_dir != new.is_dir) {
<------><------>old.dir_nlink_delta = old.is_dir ? -1 : 1;
<------><------>new.dir_nlink_delta = -old.dir_nlink_delta;
<------><------>retval = -EMLINK;
<------><------>if ((old.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(old.dir)) ||
<------><------> (new.dir_nlink_delta > 0 && EXT4_DIR_LINK_MAX(new.dir)))
<------><------><------>goto end_rename;
<------>}
<------>new_file_type = new.de->file_type;
<------>retval = ext4_setent(handle, &new, old.inode->i_ino, old.de->file_type);
<------>if (retval)
<------><------>goto end_rename;
<------>retval = ext4_setent(handle, &old, new.inode->i_ino, new_file_type);
<------>if (retval)
<------><------>goto end_rename;
<------>/*
<------> * Like most other Unix systems, set the ctime for inodes on a
<------> * rename.
<------> */
<------>ctime = current_time(old.inode);
<------>old.inode->i_ctime = ctime;
<------>new.inode->i_ctime = ctime;
<------>retval = ext4_mark_inode_dirty(handle, old.inode);
<------>if (unlikely(retval))
<------><------>goto end_rename;
<------>retval = ext4_mark_inode_dirty(handle, new.inode);
<------>if (unlikely(retval))
<------><------>goto end_rename;
<------>ext4_fc_mark_ineligible(new.inode->i_sb,
<------><------><------><------>EXT4_FC_REASON_CROSS_RENAME);
<------>if (old.dir_bh) {
<------><------>retval = ext4_rename_dir_finish(handle, &old, new.dir->i_ino);
<------><------>if (retval)
<------><------><------>goto end_rename;
<------>}
<------>if (new.dir_bh) {
<------><------>retval = ext4_rename_dir_finish(handle, &new, old.dir->i_ino);
<------><------>if (retval)
<------><------><------>goto end_rename;
<------>}
<------>ext4_update_dir_count(handle, &old);
<------>ext4_update_dir_count(handle, &new);
<------>retval = 0;
end_rename:
<------>brelse(old.dir_bh);
<------>brelse(new.dir_bh);
<------>brelse(old.bh);
<------>brelse(new.bh);
<------>if (handle)
<------><------>ext4_journal_stop(handle);
<------>return retval;
}
static int ext4_rename2(struct inode *old_dir, struct dentry *old_dentry,
<------><------><------>struct inode *new_dir, struct dentry *new_dentry,
<------><------><------>unsigned int flags)
{
<------>int err;
<------>if (unlikely(ext4_forced_shutdown(EXT4_SB(old_dir->i_sb))))
<------><------>return -EIO;
<------>if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
<------><------>return -EINVAL;
<------>err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
<------><------><------><------> flags);
<------>if (err)
<------><------>return err;
<------>if (flags & RENAME_EXCHANGE) {
<------><------>return ext4_cross_rename(old_dir, old_dentry,
<------><------><------><------><------> new_dir, new_dentry);
<------>}
<------>return ext4_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
}
/*
* directories can handle most operations...
*/
const struct inode_operations ext4_dir_inode_operations = {
<------>.create = ext4_create,
<------>.lookup = ext4_lookup,
<------>.link = ext4_link,
<------>.unlink = ext4_unlink,
<------>.symlink = ext4_symlink,
<------>.mkdir = ext4_mkdir,
<------>.rmdir = ext4_rmdir,
<------>.mknod = ext4_mknod,
<------>.tmpfile = ext4_tmpfile,
<------>.rename = ext4_rename2,
<------>.setattr = ext4_setattr,
<------>.getattr = ext4_getattr,
<------>.listxattr = ext4_listxattr,
<------>.get_acl = ext4_get_acl,
<------>.set_acl = ext4_set_acl,
<------>.fiemap = ext4_fiemap,
};
const struct inode_operations ext4_special_inode_operations = {
<------>.setattr = ext4_setattr,
<------>.getattr = ext4_getattr,
<------>.listxattr = ext4_listxattr,
<------>.get_acl = ext4_get_acl,
<------>.set_acl = ext4_set_acl,
};