[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 *parent;
	struct inode *inode;
	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);
	inode = ext2_iget(child->d_inode->i_sb, ino);

	if (IS_ERR(inode))
		return ERR_CAST(inode);
	parent = d_alloc_anon(inode);
	if (!parent) {
		iput(inode);
		parent = ERR_PTR(-ENOMEM);
	}
	return parent;
} 

/*
 * 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;
	76	struct dentry *parent;
	77	struct inode *inode;
	78	struct dentry dotdot;
	79
	80	dotdot.d_name.name = "..";
	81	dotdot.d_name.len = 2;
	82
	83	ino = ext2_inode_by_name(child->d_inode, &dotdot);
	84	if (!ino)
	85	return ERR_PTR(-ENOENT);
52fcf703	86	inode = ext2_iget(child->d_inode->i_sb, ino);
1da177e4	87
52fcf703 DH	88	if (IS_ERR(inode))
52fcf703 DH	89	return ERR_CAST(inode);
1da177e4 LT	90	parent = d_alloc_anon(inode);
	91	if (!parent) {
	92	iput(inode);
	93	parent = ERR_PTR(-ENOMEM);
	94	}
	95	return parent;
	96	}
	97
	98	/*
	99	* By the time this is called, we already have created
	100	* the directory cache entry for the new file, but it
	101	* is so far negative - it has no inode.
	102	*
	103	* If the create succeeds, we fill in the inode information
	104	* with d_instantiate().
	105	*/
	106	static int ext2_create (struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd)
	107	{
	108	struct inode * inode = ext2_new_inode (dir, mode);
	109	int err = PTR_ERR(inode);
	110	if (!IS_ERR(inode)) {
	111	inode->i_op = &ext2_file_inode_operations;
6d79125b CO	112	if (ext2_use_xip(inode->i_sb)) {
	113	inode->i_mapping->a_ops = &ext2_aops_xip;
	114	inode->i_fop = &ext2_xip_file_operations;
	115	} else if (test_opt(inode->i_sb, NOBH)) {
1da177e4	116	inode->i_mapping->a_ops = &ext2_nobh_aops;
6d79125b CO	117	inode->i_fop = &ext2_file_operations;
6d79125b CO	118	} else {
1da177e4	119	inode->i_mapping->a_ops = &ext2_aops;
6d79125b CO	120	inode->i_fop = &ext2_file_operations;
6d79125b CO	121	}
1da177e4 LT	122	mark_inode_dirty(inode);
	123	err = ext2_add_nondir(dentry, inode);
	124	}
	125	return err;
	126	}
	127
	128	static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
	129	{
	130	struct inode * inode;
	131	int err;
	132
	133	if (!new_valid_dev(rdev))
	134	return -EINVAL;
	135
	136	inode = ext2_new_inode (dir, mode);
	137	err = PTR_ERR(inode);
	138	if (!IS_ERR(inode)) {
	139	init_special_inode(inode, inode->i_mode, rdev);
	140	#ifdef CONFIG_EXT2_FS_XATTR
	141	inode->i_op = &ext2_special_inode_operations;
	142	#endif
	143	mark_inode_dirty(inode);
	144	err = ext2_add_nondir(dentry, inode);
	145	}
	146	return err;
	147	}
	148
	149	static int ext2_symlink (struct inode * dir, struct dentry * dentry,
	150	const char * symname)
	151	{
	152	struct super_block * sb = dir->i_sb;
	153	int err = -ENAMETOOLONG;
	154	unsigned l = strlen(symname)+1;
	155	struct inode * inode;
	156
	157	if (l > sb->s_blocksize)
	158	goto out;
	159
	160	inode = ext2_new_inode (dir, S_IFLNK \| S_IRWXUGO);
	161	err = PTR_ERR(inode);
	162	if (IS_ERR(inode))
	163	goto out;
	164
	165	if (l > sizeof (EXT2_I(inode)->i_data)) {
	166	/* slow symlink */
	167	inode->i_op = &ext2_symlink_inode_operations;
	168	if (test_opt(inode->i_sb, NOBH))
	169	inode->i_mapping->a_ops = &ext2_nobh_aops;
	170	else
	171	inode->i_mapping->a_ops = &ext2_aops;
	172	err = page_symlink(inode, symname, l);
	173	if (err)
	174	goto out_fail;
	175	} else {
	176	/* fast symlink */
	177	inode->i_op = &ext2_fast_symlink_inode_operations;
	178	memcpy((char*)(EXT2_I(inode)->i_data),symname,l);
	179	inode->i_size = l-1;
	180	}
	181	mark_inode_dirty(inode);
	182
	183	err = ext2_add_nondir(dentry, inode);
	184	out:
	185	return err;
186
187	out_fail:
a513b035	188	inode_dec_link_count(inode);
1da177e4 LT	189	iput (inode);
	190	goto out;
	191	}
	192
	193	static int ext2_link (struct dentry * old_dentry, struct inode * dir,
	194	struct dentry *dentry)
	195	{
	196	struct inode *inode = old_dentry->d_inode;
	197
	198	if (inode->i_nlink >= EXT2_LINK_MAX)
	199	return -EMLINK;
	200
	201	inode->i_ctime = CURRENT_TIME_SEC;
a513b035	202	inode_inc_link_count(inode);
1da177e4 LT	203	atomic_inc(&inode->i_count);
	204
	205	return ext2_add_nondir(dentry, inode);
	206	}
	207
	208	static int ext2_mkdir(struct inode * dir, struct dentry * dentry, int mode)
	209	{
	210	struct inode * inode;
	211	int err = -EMLINK;
	212
	213	if (dir->i_nlink >= EXT2_LINK_MAX)
	214	goto out;
	215
a513b035	216	inode_inc_link_count(dir);
1da177e4 LT	217
	218	inode = ext2_new_inode (dir, S_IFDIR \| mode);
	219	err = PTR_ERR(inode);
	220	if (IS_ERR(inode))
	221	goto out_dir;
	222
	223	inode->i_op = &ext2_dir_inode_operations;
	224	inode->i_fop = &ext2_dir_operations;
	225	if (test_opt(inode->i_sb, NOBH))
	226	inode->i_mapping->a_ops = &ext2_nobh_aops;
	227	else
	228	inode->i_mapping->a_ops = &ext2_aops;
	229
a513b035	230	inode_inc_link_count(inode);
1da177e4 LT	231
	232	err = ext2_make_empty(inode, dir);
	233	if (err)
	234	goto out_fail;
	235
	236	err = ext2_add_link(dentry, inode);
	237	if (err)
	238	goto out_fail;
	239
	240	d_instantiate(dentry, inode);
	241	out:
	242	return err;
	243
	244	out_fail:
a513b035 AD	245	inode_dec_link_count(inode);
a513b035 AD	246	inode_dec_link_count(inode);
1da177e4 LT	247	iput(inode);
1da177e4 LT	248	out_dir:
a513b035	249	inode_dec_link_count(dir);
1da177e4 LT	250	goto out;
	251	}
	252
	253	static int ext2_unlink(struct inode * dir, struct dentry *dentry)
	254	{
	255	struct inode * inode = dentry->d_inode;
	256	struct ext2_dir_entry_2 * de;
	257	struct page * page;
	258	int err = -ENOENT;
	259
	260	de = ext2_find_entry (dir, dentry, &page);
	261	if (!de)
	262	goto out;
	263
	264	err = ext2_delete_entry (de, page);
	265	if (err)
	266	goto out;
	267
	268	inode->i_ctime = dir->i_ctime;
a513b035	269	inode_dec_link_count(inode);
1da177e4 LT	270	err = 0;
	271	out:
	272	return err;
	273	}
	274
	275	static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
	276	{
	277	struct inode * inode = dentry->d_inode;
	278	int err = -ENOTEMPTY;
	279
	280	if (ext2_empty_dir(inode)) {
	281	err = ext2_unlink(dir, dentry);
	282	if (!err) {
	283	inode->i_size = 0;
a513b035 AD	284	inode_dec_link_count(inode);
a513b035 AD	285	inode_dec_link_count(dir);
1da177e4 LT	286	}
	287	}
	288	return err;
	289	}
	290
	291	static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
	292	struct inode * new_dir, struct dentry * new_dentry )
	293	{
	294	struct inode * old_inode = old_dentry->d_inode;
	295	struct inode * new_inode = new_dentry->d_inode;
	296	struct page * dir_page = NULL;
	297	struct ext2_dir_entry_2 * dir_de = NULL;
	298	struct page * old_page;
	299	struct ext2_dir_entry_2 * old_de;
	300	int err = -ENOENT;
	301
	302	old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
	303	if (!old_de)
	304	goto out;
	305
	306	if (S_ISDIR(old_inode->i_mode)) {
	307	err = -EIO;
	308	dir_de = ext2_dotdot(old_inode, &dir_page);
	309	if (!dir_de)
	310	goto out_old;
	311	}
	312
	313	if (new_inode) {
	314	struct page *new_page;
	315	struct ext2_dir_entry_2 *new_de;
	316
	317	err = -ENOTEMPTY;
	318	if (dir_de && !ext2_empty_dir (new_inode))
	319	goto out_dir;
	320
	321	err = -ENOENT;
	322	new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
	323	if (!new_de)
	324	goto out_dir;
a513b035	325	inode_inc_link_count(old_inode);
1da177e4 LT	326	ext2_set_link(new_dir, new_de, new_page, old_inode);
	327	new_inode->i_ctime = CURRENT_TIME_SEC;
	328	if (dir_de)
9a53c3a7	329	drop_nlink(new_inode);
a513b035	330	inode_dec_link_count(new_inode);
1da177e4 LT	331	} else {
	332	if (dir_de) {
	333	err = -EMLINK;
	334	if (new_dir->i_nlink >= EXT2_LINK_MAX)
	335	goto out_dir;
	336	}
a513b035	337	inode_inc_link_count(old_inode);
1da177e4 LT	338	err = ext2_add_link(new_dentry, old_inode);
1da177e4 LT	339	if (err) {
a513b035	340	inode_dec_link_count(old_inode);
1da177e4 LT	341	goto out_dir;
	342	}
	343	if (dir_de)
a513b035	344	inode_inc_link_count(new_dir);
1da177e4 LT	345	}
	346
	347	/*
	348	* Like most other Unix systems, set the ctime for inodes on a
	349	* rename.
a513b035	350	* inode_dec_link_count() will mark the inode dirty.
1da177e4 LT	351	*/
	352	old_inode->i_ctime = CURRENT_TIME_SEC;
	353
	354	ext2_delete_entry (old_de, old_page);
a513b035	355	inode_dec_link_count(old_inode);
1da177e4 LT	356
	357	if (dir_de) {
	358	ext2_set_link(old_inode, dir_de, dir_page, new_dir);
a513b035	359	inode_dec_link_count(old_dir);
1da177e4 LT	360	}
	361	return 0;
	362
	363
	364	out_dir:
	365	if (dir_de) {
	366	kunmap(dir_page);
	367	page_cache_release(dir_page);
	368	}
	369	out_old:
	370	kunmap(old_page);
	371	page_cache_release(old_page);
	372	out:
	373	return err;
	374	}
	375
754661f1	376	const struct inode_operations ext2_dir_inode_operations = {
1da177e4 LT	377	.create = ext2_create,
	378	.lookup = ext2_lookup,
	379	.link = ext2_link,
	380	.unlink = ext2_unlink,
	381	.symlink = ext2_symlink,
	382	.mkdir = ext2_mkdir,
	383	.rmdir = ext2_rmdir,
	384	.mknod = ext2_mknod,
	385	.rename = ext2_rename,
	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	};
	395
754661f1	396	const struct inode_operations ext2_special_inode_operations = {
1da177e4 LT	397	#ifdef CONFIG_EXT2_FS_XATTR
	398	.setxattr = generic_setxattr,
	399	.getxattr = generic_getxattr,
	400	.listxattr = ext2_listxattr,
	401	.removexattr = generic_removexattr,
	402	#endif
	403	.setattr = ext2_setattr,
	404	.permission = ext2_permission,
	405	};