Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * linux/fs/ext2/namei.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Rewrite to pagecache. Almost all code had been changed, so blame me
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * if the things go wrong. Please, send bug reports to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * viro@parcelfarce.linux.theplanet.co.uk
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Stuff here is basically a glue between the VFS and generic UNIXish
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * filesystem that keeps everything in pagecache. All knowledge of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * directory layout is in fs/ext2/dir.c - it turned out to be easily separatable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * and it's easier to debug that way. In principle we might want to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * generalize that a bit and turn it into a library. Or not.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  * The only non-static object here is ext2_dir_inode_operations.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  * TODO: get rid of kmap() use, add readahead.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * Copyright (C) 1992, 1993, 1994, 1995
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * Remy Card (card@masi.ibp.fr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  * Laboratoire MASI - Institut Blaise Pascal
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22)  * Universite Pierre et Marie Curie (Paris VI)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24)  *  from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26)  *  linux/fs/minix/namei.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28)  *  Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30)  *  Big-endian to little-endian byte-swapping/bitmaps by
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31)  *        David S. Miller (davem@caip.rutgers.edu), 1995
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <linux/quotaops.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include "ext2.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) #include "xattr.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #include "acl.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	int err = ext2_add_link(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 		d_instantiate_new(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	inode_dec_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	discard_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53)  * Methods themselves.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	struct inode * inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	ino_t ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	if (dentry->d_name.len > EXT2_NAME_LEN)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		return ERR_PTR(-ENAMETOOLONG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	res = ext2_inode_by_name(dir, &dentry->d_name, &ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	if (res) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 		if (res != -ENOENT)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 			return ERR_PTR(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		inode = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		inode = ext2_iget(dir->i_sb, ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		if (inode == ERR_PTR(-ESTALE)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 			ext2_error(dir->i_sb, __func__,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 					"deleted inode referenced: %lu",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 					(unsigned long) ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 			return ERR_PTR(-EIO);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	return d_splice_alias(inode, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) struct dentry *ext2_get_parent(struct dentry *child)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	struct qstr dotdot = QSTR_INIT("..", 2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 	ino_t ino;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	int res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	res = ext2_inode_by_name(d_inode(child), &dotdot, &ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	if (res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 		return ERR_PTR(res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	return d_obtain_alias(ext2_iget(child->d_sb, ino));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) } 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96)  * By the time this is called, we already have created
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97)  * the directory cache entry for the new file, but it
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98)  * is so far negative - it has no inode.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)  * If the create succeeds, we fill in the inode information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)  * with d_instantiate(). 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	struct inode *inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	inode = ext2_new_inode(dir, mode, &dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		return PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	ext2_set_file_ops(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	return ext2_add_nondir(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	struct inode *inode = ext2_new_inode(dir, mode, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		return PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	ext2_set_file_ops(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	d_tmpfile(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	unlock_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	struct inode * inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 	err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	inode = ext2_new_inode (dir, mode, &dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	if (!IS_ERR(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		init_special_inode(inode, inode->i_mode, rdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		inode->i_op = &ext2_special_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 		mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		err = ext2_add_nondir(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) static int ext2_symlink (struct inode * dir, struct dentry * dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	const char * symname)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	struct super_block * sb = dir->i_sb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	int err = -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	unsigned l = strlen(symname)+1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	struct inode * inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (l > sb->s_blocksize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	if (l > sizeof (EXT2_I(inode)->i_data)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		/* slow symlink */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		inode->i_op = &ext2_symlink_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 		inode_nohighmem(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		if (test_opt(inode->i_sb, NOBH))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 			inode->i_mapping->a_ops = &ext2_nobh_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 			inode->i_mapping->a_ops = &ext2_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		err = page_symlink(inode, symname, l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		/* fast symlink */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		inode->i_op = &ext2_fast_symlink_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		inode->i_link = (char*)EXT2_I(inode)->i_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 		memcpy(inode->i_link, symname, l);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		inode->i_size = l-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	mark_inode_dirty(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	err = ext2_add_nondir(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) out_fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	inode_dec_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	discard_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static int ext2_link (struct dentry * old_dentry, struct inode * dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	struct inode *inode = d_inode(old_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	inode->i_ctime = current_time(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	inode_inc_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	ihold(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	err = ext2_add_link(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		d_instantiate(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	inode_dec_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	iput(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	struct inode * inode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	inode_inc_link_count(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	err = PTR_ERR(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (IS_ERR(inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		goto out_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	inode->i_op = &ext2_dir_inode_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	inode->i_fop = &ext2_dir_operations;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	if (test_opt(inode->i_sb, NOBH))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		inode->i_mapping->a_ops = &ext2_nobh_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		inode->i_mapping->a_ops = &ext2_aops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	inode_inc_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	err = ext2_make_empty(inode, dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	err = ext2_add_link(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 		goto out_fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	d_instantiate_new(dentry, inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) out_fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	inode_dec_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	inode_dec_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	discard_new_inode(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) out_dir:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	inode_dec_link_count(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) static int ext2_unlink(struct inode * dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	struct inode * inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	struct ext2_dir_entry_2 * de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	struct page * page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	err = dquot_initialize(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	de = ext2_find_entry(dir, &dentry->d_name, &page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	if (IS_ERR(de)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		err = PTR_ERR(de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	err = ext2_delete_entry (de, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	inode->i_ctime = dir->i_ctime;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	inode_dec_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	err = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	struct inode * inode = d_inode(dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	int err = -ENOTEMPTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	if (ext2_empty_dir(inode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		err = ext2_unlink(dir, dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 		if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 			inode->i_size = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 			inode_dec_link_count(inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 			inode_dec_link_count(dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 			struct inode * new_dir,	struct dentry * new_dentry,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 			unsigned int flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	struct inode * old_inode = d_inode(old_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 	struct inode * new_inode = d_inode(new_dentry);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	struct page * dir_page = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	struct ext2_dir_entry_2 * dir_de = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	struct page * old_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) 	struct ext2_dir_entry_2 * old_de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 	if (flags & ~RENAME_NOREPLACE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	err = dquot_initialize(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	err = dquot_initialize(new_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 	if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	old_de = ext2_find_entry(old_dir, &old_dentry->d_name, &old_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	if (IS_ERR(old_de)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		err = PTR_ERR(old_de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	if (S_ISDIR(old_inode->i_mode)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 		err = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 		dir_de = ext2_dotdot(old_inode, &dir_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 		if (!dir_de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 			goto out_old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	if (new_inode) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		struct page *new_page;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		struct ext2_dir_entry_2 *new_de;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 		err = -ENOTEMPTY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 		if (dir_de && !ext2_empty_dir (new_inode))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 			goto out_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 		new_de = ext2_find_entry(new_dir, &new_dentry->d_name, &new_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		if (IS_ERR(new_de)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 			err = PTR_ERR(new_de);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 			goto out_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 		ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		new_inode->i_ctime = current_time(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		if (dir_de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 			drop_nlink(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 		inode_dec_link_count(new_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 		err = ext2_add_link(new_dentry, old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 			goto out_dir;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 		if (dir_de)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 			inode_inc_link_count(new_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 	 * Like most other Unix systems, set the ctime for inodes on a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)  	 * rename.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	old_inode->i_ctime = current_time(old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 	mark_inode_dirty(old_inode);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	ext2_delete_entry (old_de, old_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	if (dir_de) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		if (old_dir != new_dir)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 			ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 			kunmap(dir_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 			put_page(dir_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 		inode_dec_link_count(old_dir);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) out_dir:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) 	if (dir_de) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) 		kunmap(dir_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) 		put_page(dir_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) out_old:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) 	kunmap(old_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) 	put_page(old_page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) const struct inode_operations ext2_dir_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) 	.create		= ext2_create,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) 	.lookup		= ext2_lookup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) 	.link		= ext2_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) 	.unlink		= ext2_unlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) 	.symlink	= ext2_symlink,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) 	.mkdir		= ext2_mkdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) 	.rmdir		= ext2_rmdir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) 	.mknod		= ext2_mknod,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) 	.rename		= ext2_rename,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) 	.listxattr	= ext2_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) 	.getattr	= ext2_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) 	.setattr	= ext2_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) 	.get_acl	= ext2_get_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) 	.set_acl	= ext2_set_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) 	.tmpfile	= ext2_tmpfile,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) const struct inode_operations ext2_special_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) 	.listxattr	= ext2_listxattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) 	.getattr	= ext2_getattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) 	.setattr	= ext2_setattr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) 	.get_acl	= ext2_get_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) 	.set_acl	= ext2_set_acl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) };