[linux.git] / fs / ext2 / namei.c

/*
 * linux/fs/ext2/namei.c
 *
 * Rewrite to pagecache. Almost all code had been changed, so blame me
 * if the things go wrong. Please, send bug reports to
 * [email protected]
 *
 * Stuff here is basically a glue between the VFS and generic UNIXish
 * filesystem that keeps everything in pagecache. All knowledge of the
 * directory layout is in fs/ext2/dir.c - it turned out to be easily separatable
 * and it's easier to debug that way. In principle we might want to
 * generalize that a bit and turn it into a library. Or not.
 *
 * The only non-static object here is ext2_dir_inode_operations.
 *
 * TODO: get rid of kmap() use, add readahead.
 *
 * Copyright (C) 1992, 1993, 1994, 1995
 * Remy Card ([email protected])
 * 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 ([email protected]), 1995
 */

#include <linux/pagemap.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"
#include "xip.h"

static inline int ext2_add_nondir(struct dentry *dentry, struct inode *inode)
{
	int err = ext2_add_link(dentry, inode);
	if (!err) {
		d_instantiate(dentry, inode);
		return 0;
	}
	inode_dec_link_count(inode);
	iput(inode);
	return err;
}

/*
 * Methods themselves.
 */

static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
{
	struct inode * inode;
	ino_t ino;
	
	if (dentry->d_name.len > EXT2_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	ino = ext2_inode_by_name(dir, dentry);
	inode = NULL;
	if (ino) {
		inode = ext2_iget(dir->i_sb, ino);
		if (IS_ERR(inode))
			return ERR_CAST(inode);
	}
	return d_splice_alias(inode, dentry);
}

struct dentry *ext2_get_parent(struct dentry *child)
{
	unsigned long ino;
	struct dentry dotdot;

	dotdot.d_name.name = "..";
	dotdot.d_name.len = 2;

	ino = ext2_inode_by_name(child->d_inode, &dotdot);
	if (!ino)
		return ERR_PTR(-ENOENT);
	return d_obtain_alias(ext2_iget(child->d_inode->i_sb, ino));
} 

/*
 * 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 ext2_create (struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd)
{
	struct inode * inode = ext2_new_inode (dir, mode);
	int err = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
		inode->i_op = &ext2_file_inode_operations;
		if (ext2_use_xip(inode->i_sb)) {
			inode->i_mapping->a_ops = &ext2_aops_xip;
			inode->i_fop = &ext2_xip_file_operations;
		} else if (test_opt(inode->i_sb, NOBH)) {
			inode->i_mapping->a_ops = &ext2_nobh_aops;
			inode->i_fop = &ext2_file_operations;
		} else {
			inode->i_mapping->a_ops = &ext2_aops;
			inode->i_fop = &ext2_file_operations;
		}
		mark_inode_dirty(inode);
		err = ext2_add_nondir(dentry, inode);
	}
	return err;
}

static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
{
	struct inode * inode;
	int err;

	if (!new_valid_dev(rdev))
		return -EINVAL;

	inode = ext2_new_inode (dir, mode);
	err = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
		init_special_inode(inode, inode->i_mode, rdev);
#ifdef CONFIG_EXT2_FS_XATTR
		inode->i_op = &ext2_special_inode_operations;
#endif
		mark_inode_dirty(inode);
		err = ext2_add_nondir(dentry, inode);
	}
	return err;
}

static int ext2_symlink (struct inode * dir, struct dentry * dentry,
	const char * symname)
{
	struct super_block * sb = dir->i_sb;
	int err = -ENAMETOOLONG;
	unsigned l = strlen(symname)+1;
	struct inode * inode;

	if (l > sb->s_blocksize)
		goto out;

	inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO);
	err = PTR_ERR(inode);
	if (IS_ERR(inode))
		goto out;

	if (l > sizeof (EXT2_I(inode)->i_data)) {
		/* slow symlink */
		inode->i_op = &ext2_symlink_inode_operations;
		if (test_opt(inode->i_sb, NOBH))
			inode->i_mapping->a_ops = &ext2_nobh_aops;
		else
			inode->i_mapping->a_ops = &ext2_aops;
		err = page_symlink(inode, symname, l);
		if (err)
			goto out_fail;
	} else {
		/* fast symlink */
		inode->i_op = &ext2_fast_symlink_inode_operations;
		memcpy((char*)(EXT2_I(inode)->i_data),symname,l);
		inode->i_size = l-1;
	}
	mark_inode_dirty(inode);

	err = ext2_add_nondir(dentry, inode);
out:
	return err;

out_fail:
	inode_dec_link_count(inode);
	iput (inode);
	goto out;
}

static int ext2_link (struct dentry * old_dentry, struct inode * dir,
	struct dentry *dentry)
{
	struct inode *inode = old_dentry->d_inode;

	if (inode->i_nlink >= EXT2_LINK_MAX)
		return -EMLINK;

	inode->i_ctime = CURRENT_TIME_SEC;
	inode_inc_link_count(inode);
	atomic_inc(&inode->i_count);

	return ext2_add_nondir(dentry, inode);
}

static int ext2_mkdir(struct inode * dir, struct dentry * dentry, int mode)
{
	struct inode * inode;
	int err = -EMLINK;

	if (dir->i_nlink >= EXT2_LINK_MAX)
		goto out;

	inode_inc_link_count(dir);

	inode = ext2_new_inode (dir, S_IFDIR | mode);
	err = PTR_ERR(inode);
	if (IS_ERR(inode))
		goto out_dir;

	inode->i_op = &ext2_dir_inode_operations;
	inode->i_fop = &ext2_dir_operations;
	if (test_opt(inode->i_sb, NOBH))
		inode->i_mapping->a_ops = &ext2_nobh_aops;
	else
		inode->i_mapping->a_ops = &ext2_aops;

	inode_inc_link_count(inode);

	err = ext2_make_empty(inode, dir);
	if (err)
		goto out_fail;

	err = ext2_add_link(dentry, inode);
	if (err)
		goto out_fail;

	d_instantiate(dentry, inode);
out:
	return err;

out_fail:
	inode_dec_link_count(inode);
	inode_dec_link_count(inode);
	iput(inode);
out_dir:
	inode_dec_link_count(dir);
	goto out;
}

static int ext2_unlink(struct inode * dir, struct dentry *dentry)
{
	struct inode * inode = dentry->d_inode;
	struct ext2_dir_entry_2 * de;
	struct page * page;
	int err = -ENOENT;

	de = ext2_find_entry (dir, dentry, &page);
	if (!de)
		goto out;

	err = ext2_delete_entry (de, page);
	if (err)
		goto out;

	inode->i_ctime = dir->i_ctime;
	inode_dec_link_count(inode);
	err = 0;
out:
	return err;
}

static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
{
	struct inode * inode = dentry->d_inode;
	int err = -ENOTEMPTY;

	if (ext2_empty_dir(inode)) {
		err = ext2_unlink(dir, dentry);
		if (!err) {
			inode->i_size = 0;
			inode_dec_link_count(inode);
			inode_dec_link_count(dir);
		}
	}
	return err;
}

static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
	struct inode * new_dir,	struct dentry * new_dentry )
{
	struct inode * old_inode = old_dentry->d_inode;
	struct inode * new_inode = new_dentry->d_inode;
	struct page * dir_page = NULL;
	struct ext2_dir_entry_2 * dir_de = NULL;
	struct page * old_page;
	struct ext2_dir_entry_2 * old_de;
	int err = -ENOENT;

	old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
	if (!old_de)
		goto out;

	if (S_ISDIR(old_inode->i_mode)) {
		err = -EIO;
		dir_de = ext2_dotdot(old_inode, &dir_page);
		if (!dir_de)
			goto out_old;
	}

	if (new_inode) {
		struct page *new_page;
		struct ext2_dir_entry_2 *new_de;

		err = -ENOTEMPTY;
		if (dir_de && !ext2_empty_dir (new_inode))
			goto out_dir;

		err = -ENOENT;
		new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
		if (!new_de)
			goto out_dir;
		inode_inc_link_count(old_inode);
		ext2_set_link(new_dir, new_de, new_page, old_inode);
		new_inode->i_ctime = CURRENT_TIME_SEC;
		if (dir_de)
			drop_nlink(new_inode);
		inode_dec_link_count(new_inode);
	} else {
		if (dir_de) {
			err = -EMLINK;
			if (new_dir->i_nlink >= EXT2_LINK_MAX)
				goto out_dir;
		}
		inode_inc_link_count(old_inode);
		err = ext2_add_link(new_dentry, old_inode);
		if (err) {
			inode_dec_link_count(old_inode);
			goto out_dir;
		}
		if (dir_de)
			inode_inc_link_count(new_dir);
	}

	/*
	 * Like most other Unix systems, set the ctime for inodes on a
 	 * rename.
	 * inode_dec_link_count() will mark the inode dirty.
	 */
	old_inode->i_ctime = CURRENT_TIME_SEC;

	ext2_delete_entry (old_de, old_page);
	inode_dec_link_count(old_inode);

	if (dir_de) {
		ext2_set_link(old_inode, dir_de, dir_page, new_dir);
		inode_dec_link_count(old_dir);
	}
	return 0;


out_dir:
	if (dir_de) {
		kunmap(dir_page);
		page_cache_release(dir_page);
	}
out_old:
	kunmap(old_page);
	page_cache_release(old_page);
out:
	return err;
}

const struct inode_operations ext2_dir_inode_operations = {
	.create		= ext2_create,
	.lookup		= ext2_lookup,
	.link		= ext2_link,
	.unlink		= ext2_unlink,
	.symlink	= ext2_symlink,
	.mkdir		= ext2_mkdir,
	.rmdir		= ext2_rmdir,
	.mknod		= ext2_mknod,
	.rename		= ext2_rename,
#ifdef CONFIG_EXT2_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= ext2_listxattr,
	.removexattr	= generic_removexattr,
#endif
	.setattr	= ext2_setattr,
	.permission	= ext2_permission,
};

const struct inode_operations ext2_special_inode_operations = {
#ifdef CONFIG_EXT2_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= ext2_listxattr,
	.removexattr	= generic_removexattr,
#endif
	.setattr	= ext2_setattr,
	.permission	= ext2_permission,
};
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/ext2/namei.c
	3	*
	4	* Rewrite to pagecache. Almost all code had been changed, so blame me
	5	* if the things go wrong. Please, send bug reports to
	6	* [email protected]
	7	*
	8	* Stuff here is basically a glue between the VFS and generic UNIXish
	9	* filesystem that keeps everything in pagecache. All knowledge of the
	10	* directory layout is in fs/ext2/dir.c - it turned out to be easily separatable
	11	* and it's easier to debug that way. In principle we might want to
	12	* generalize that a bit and turn it into a library. Or not.
	13	*
	14	* The only non-static object here is ext2_dir_inode_operations.
	15	*
	16	* TODO: get rid of kmap() use, add readahead.
	17	*
	18	* Copyright (C) 1992, 1993, 1994, 1995
	19	* Remy Card ([email protected])
	20	* Laboratoire MASI - Institut Blaise Pascal
	21	* Universite Pierre et Marie Curie (Paris VI)
	22	*
	23	* from
	24	*
	25	* linux/fs/minix/namei.c
	26	*
	27	* Copyright (C) 1991, 1992 Linus Torvalds
	28	*
	29	* Big-endian to little-endian byte-swapping/bitmaps by
	30	* David S. Miller ([email protected]), 1995
	31	*/
	32
	33	#include <linux/pagemap.h>
	34	#include "ext2.h"
	35	#include "xattr.h"
	36	#include "acl.h"
6d79125b	37	#include "xip.h"
1da177e4	38
1da177e4 LT	39	static inline int ext2_add_nondir(struct dentry dentry, struct inode inode)
	40	{
	41	int err = ext2_add_link(dentry, inode);
	42	if (!err) {
	43	d_instantiate(dentry, inode);
	44	return 0;
	45	}
a513b035	46	inode_dec_link_count(inode);
1da177e4 LT	47	iput(inode);
	48	return err;
	49	}
	50
	51	/*
	52	* Methods themselves.
	53	*/
	54
	55	static struct dentry ext2_lookup(struct inode dir, struct dentry dentry, struct nameidata nd)
	56	{
	57	struct inode * inode;
	58	ino_t ino;
	59
	60	if (dentry->d_name.len > EXT2_NAME_LEN)
	61	return ERR_PTR(-ENAMETOOLONG);
	62
	63	ino = ext2_inode_by_name(dir, dentry);
	64	inode = NULL;
	65	if (ino) {
52fcf703 DH	66	inode = ext2_iget(dir->i_sb, ino);
	67	if (IS_ERR(inode))
	68	return ERR_CAST(inode);
1da177e4	69	}
082a05c6	70	return d_splice_alias(inode, dentry);
1da177e4 LT	71	}
	72
	73	struct dentry ext2_get_parent(struct dentry child)
	74	{
	75	unsigned long ino;
1da177e4 LT	76	struct dentry dotdot;
	77
	78	dotdot.d_name.name = "..";
	79	dotdot.d_name.len = 2;
	80
	81	ino = ext2_inode_by_name(child->d_inode, &dotdot);
	82	if (!ino)
	83	return ERR_PTR(-ENOENT);
44003728	84	return d_obtain_alias(ext2_iget(child->d_inode->i_sb, ino));
1da177e4 LT	85	}
	86
	87	/*
	88	* By the time this is called, we already have created
	89	* the directory cache entry for the new file, but it
	90	* is so far negative - it has no inode.
	91	*
	92	* If the create succeeds, we fill in the inode information
	93	* with d_instantiate().
	94	*/
	95	static int ext2_create (struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd)
	96	{
	97	struct inode * inode = ext2_new_inode (dir, mode);
	98	int err = PTR_ERR(inode);
	99	if (!IS_ERR(inode)) {
	100	inode->i_op = &ext2_file_inode_operations;
6d79125b CO	101	if (ext2_use_xip(inode->i_sb)) {
	102	inode->i_mapping->a_ops = &ext2_aops_xip;
	103	inode->i_fop = &ext2_xip_file_operations;
	104	} else if (test_opt(inode->i_sb, NOBH)) {
1da177e4	105	inode->i_mapping->a_ops = &ext2_nobh_aops;
6d79125b CO	106	inode->i_fop = &ext2_file_operations;
6d79125b CO	107	} else {
1da177e4	108	inode->i_mapping->a_ops = &ext2_aops;
6d79125b CO	109	inode->i_fop = &ext2_file_operations;
6d79125b CO	110	}
1da177e4 LT	111	mark_inode_dirty(inode);
	112	err = ext2_add_nondir(dentry, inode);
	113	}
	114	return err;
	115	}
	116
	117	static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
	118	{
	119	struct inode * inode;
	120	int err;
	121
	122	if (!new_valid_dev(rdev))
	123	return -EINVAL;
	124
	125	inode = ext2_new_inode (dir, mode);
	126	err = PTR_ERR(inode);
	127	if (!IS_ERR(inode)) {
	128	init_special_inode(inode, inode->i_mode, rdev);
	129	#ifdef CONFIG_EXT2_FS_XATTR
	130	inode->i_op = &ext2_special_inode_operations;
	131	#endif
	132	mark_inode_dirty(inode);
	133	err = ext2_add_nondir(dentry, inode);
	134	}
	135	return err;
	136	}
	137
	138	static int ext2_symlink (struct inode * dir, struct dentry * dentry,
	139	const char * symname)
	140	{
	141	struct super_block * sb = dir->i_sb;
	142	int err = -ENAMETOOLONG;
	143	unsigned l = strlen(symname)+1;
	144	struct inode * inode;
	145
	146	if (l > sb->s_blocksize)
	147	goto out;
	148
	149	inode = ext2_new_inode (dir, S_IFLNK \| S_IRWXUGO);
	150	err = PTR_ERR(inode);
	151	if (IS_ERR(inode))
	152	goto out;
	153
	154	if (l > sizeof (EXT2_I(inode)->i_data)) {
	155	/* slow symlink */
	156	inode->i_op = &ext2_symlink_inode_operations;
	157	if (test_opt(inode->i_sb, NOBH))
	158	inode->i_mapping->a_ops = &ext2_nobh_aops;
	159	else
	160	inode->i_mapping->a_ops = &ext2_aops;
	161	err = page_symlink(inode, symname, l);
	162	if (err)
	163	goto out_fail;
	164	} else {
	165	/* fast symlink */
	166	inode->i_op = &ext2_fast_symlink_inode_operations;
	167	memcpy((char*)(EXT2_I(inode)->i_data),symname,l);
	168	inode->i_size = l-1;
	169	}
	170	mark_inode_dirty(inode);
	171
	172	err = ext2_add_nondir(dentry, inode);
	173	out:
	174	return err;
175
176	out_fail:
a513b035	177	inode_dec_link_count(inode);
1da177e4 LT	178	iput (inode);
	179	goto out;
	180	}
	181
	182	static int ext2_link (struct dentry * old_dentry, struct inode * dir,
	183	struct dentry *dentry)
	184	{
	185	struct inode *inode = old_dentry->d_inode;
	186
	187	if (inode->i_nlink >= EXT2_LINK_MAX)
	188	return -EMLINK;
	189
	190	inode->i_ctime = CURRENT_TIME_SEC;
a513b035	191	inode_inc_link_count(inode);
1da177e4 LT	192	atomic_inc(&inode->i_count);
	193
	194	return ext2_add_nondir(dentry, inode);
	195	}
	196
	197	static int ext2_mkdir(struct inode * dir, struct dentry * dentry, int mode)
	198	{
	199	struct inode * inode;
	200	int err = -EMLINK;
	201
	202	if (dir->i_nlink >= EXT2_LINK_MAX)
	203	goto out;
	204
a513b035	205	inode_inc_link_count(dir);
1da177e4 LT	206
	207	inode = ext2_new_inode (dir, S_IFDIR \| mode);
	208	err = PTR_ERR(inode);
	209	if (IS_ERR(inode))
	210	goto out_dir;
	211
	212	inode->i_op = &ext2_dir_inode_operations;
	213	inode->i_fop = &ext2_dir_operations;
	214	if (test_opt(inode->i_sb, NOBH))
	215	inode->i_mapping->a_ops = &ext2_nobh_aops;
	216	else
	217	inode->i_mapping->a_ops = &ext2_aops;
	218
a513b035	219	inode_inc_link_count(inode);
1da177e4 LT	220
	221	err = ext2_make_empty(inode, dir);
	222	if (err)
	223	goto out_fail;
	224
	225	err = ext2_add_link(dentry, inode);
	226	if (err)
	227	goto out_fail;
	228
	229	d_instantiate(dentry, inode);
	230	out:
	231	return err;
	232
	233	out_fail:
a513b035 AD	234	inode_dec_link_count(inode);
a513b035 AD	235	inode_dec_link_count(inode);
1da177e4 LT	236	iput(inode);
1da177e4 LT	237	out_dir:
a513b035	238	inode_dec_link_count(dir);
1da177e4 LT	239	goto out;
	240	}
	241
	242	static int ext2_unlink(struct inode * dir, struct dentry *dentry)
	243	{
	244	struct inode * inode = dentry->d_inode;
	245	struct ext2_dir_entry_2 * de;
	246	struct page * page;
	247	int err = -ENOENT;
	248
	249	de = ext2_find_entry (dir, dentry, &page);
	250	if (!de)
	251	goto out;
	252
	253	err = ext2_delete_entry (de, page);
	254	if (err)
	255	goto out;
	256
	257	inode->i_ctime = dir->i_ctime;
a513b035	258	inode_dec_link_count(inode);
1da177e4 LT	259	err = 0;
	260	out:
	261	return err;
	262	}
	263
	264	static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
	265	{
	266	struct inode * inode = dentry->d_inode;
	267	int err = -ENOTEMPTY;
	268
	269	if (ext2_empty_dir(inode)) {
	270	err = ext2_unlink(dir, dentry);
	271	if (!err) {
	272	inode->i_size = 0;
a513b035 AD	273	inode_dec_link_count(inode);
a513b035 AD	274	inode_dec_link_count(dir);
1da177e4 LT	275	}
	276	}
	277	return err;
	278	}
	279
	280	static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
	281	struct inode * new_dir, struct dentry * new_dentry )
	282	{
	283	struct inode * old_inode = old_dentry->d_inode;
	284	struct inode * new_inode = new_dentry->d_inode;
	285	struct page * dir_page = NULL;
	286	struct ext2_dir_entry_2 * dir_de = NULL;
	287	struct page * old_page;
	288	struct ext2_dir_entry_2 * old_de;
	289	int err = -ENOENT;
	290
	291	old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
	292	if (!old_de)
	293	goto out;
	294
	295	if (S_ISDIR(old_inode->i_mode)) {
	296	err = -EIO;
	297	dir_de = ext2_dotdot(old_inode, &dir_page);
	298	if (!dir_de)
	299	goto out_old;
	300	}
	301
	302	if (new_inode) {
	303	struct page *new_page;
	304	struct ext2_dir_entry_2 *new_de;
	305
	306	err = -ENOTEMPTY;
	307	if (dir_de && !ext2_empty_dir (new_inode))
	308	goto out_dir;
	309
	310	err = -ENOENT;
	311	new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
	312	if (!new_de)
	313	goto out_dir;
a513b035	314	inode_inc_link_count(old_inode);
1da177e4 LT	315	ext2_set_link(new_dir, new_de, new_page, old_inode);
	316	new_inode->i_ctime = CURRENT_TIME_SEC;
	317	if (dir_de)
9a53c3a7	318	drop_nlink(new_inode);
a513b035	319	inode_dec_link_count(new_inode);
1da177e4 LT	320	} else {
	321	if (dir_de) {
	322	err = -EMLINK;
	323	if (new_dir->i_nlink >= EXT2_LINK_MAX)
	324	goto out_dir;
	325	}
a513b035	326	inode_inc_link_count(old_inode);
1da177e4 LT	327	err = ext2_add_link(new_dentry, old_inode);
1da177e4 LT	328	if (err) {
a513b035	329	inode_dec_link_count(old_inode);
1da177e4 LT	330	goto out_dir;
	331	}
	332	if (dir_de)
a513b035	333	inode_inc_link_count(new_dir);
1da177e4 LT	334	}
	335
	336	/*
	337	* Like most other Unix systems, set the ctime for inodes on a
	338	* rename.
a513b035	339	* inode_dec_link_count() will mark the inode dirty.
1da177e4 LT	340	*/
	341	old_inode->i_ctime = CURRENT_TIME_SEC;
	342
	343	ext2_delete_entry (old_de, old_page);
a513b035	344	inode_dec_link_count(old_inode);
1da177e4 LT	345
	346	if (dir_de) {
	347	ext2_set_link(old_inode, dir_de, dir_page, new_dir);
a513b035	348	inode_dec_link_count(old_dir);
1da177e4 LT	349	}
	350	return 0;
	351
	352
	353	out_dir:
	354	if (dir_de) {
	355	kunmap(dir_page);
	356	page_cache_release(dir_page);
	357	}
	358	out_old:
	359	kunmap(old_page);
	360	page_cache_release(old_page);
	361	out:
	362	return err;
	363	}
	364
754661f1	365	const struct inode_operations ext2_dir_inode_operations = {
1da177e4 LT	366	.create = ext2_create,
	367	.lookup = ext2_lookup,
	368	.link = ext2_link,
	369	.unlink = ext2_unlink,
	370	.symlink = ext2_symlink,
	371	.mkdir = ext2_mkdir,
	372	.rmdir = ext2_rmdir,
	373	.mknod = ext2_mknod,
	374	.rename = ext2_rename,
	375	#ifdef CONFIG_EXT2_FS_XATTR
	376	.setxattr = generic_setxattr,
	377	.getxattr = generic_getxattr,
	378	.listxattr = ext2_listxattr,
	379	.removexattr = generic_removexattr,
	380	#endif
	381	.setattr = ext2_setattr,
	382	.permission = ext2_permission,
	383	};
	384
754661f1	385	const struct inode_operations ext2_special_inode_operations = {
1da177e4 LT	386	#ifdef CONFIG_EXT2_FS_XATTR
	387	.setxattr = generic_setxattr,
	388	.getxattr = generic_getxattr,
	389	.listxattr = ext2_listxattr,
	390	.removexattr = generic_removexattr,
	391	#endif
	392	.setattr = ext2_setattr,
	393	.permission = ext2_permission,
	394	};