[mirror_ubuntu-artful-kernel.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
 * viro@parcelfarce.linux.theplanet.co.uk
 *
 * 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 (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
 */

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

/*
 * Couple of helper functions - make the code slightly cleaner.
 */

static inline void ext2_inc_count(struct inode *inode)
{
	inode->i_nlink++;
	mark_inode_dirty(inode);
}

static inline void ext2_dec_count(struct inode *inode)
{
	inode->i_nlink--;
	mark_inode_dirty(inode);
}

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;
	}
	ext2_dec_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 = iget(dir->i_sb, ino);
		if (!inode)
			return ERR_PTR(-EACCES);
	}
	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 = iget(child->d_inode->i_sb, ino);

	if (!inode)
		return ERR_PTR(-EACCES);
	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:
	ext2_dec_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;
	ext2_inc_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;

	ext2_inc_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;

	ext2_inc_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:
	ext2_dec_count(inode);
	ext2_dec_count(inode);
	iput(inode);
out_dir:
	ext2_dec_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;
	ext2_dec_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;
			ext2_dec_count(inode);
			ext2_dec_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;
		ext2_inc_count(old_inode);
		ext2_set_link(new_dir, new_de, new_page, old_inode);
		new_inode->i_ctime = CURRENT_TIME_SEC;
		if (dir_de)
			new_inode->i_nlink--;
		ext2_dec_count(new_inode);
	} else {
		if (dir_de) {
			err = -EMLINK;
			if (new_dir->i_nlink >= EXT2_LINK_MAX)
				goto out_dir;
		}
		ext2_inc_count(old_inode);
		err = ext2_add_link(new_dentry, old_inode);
		if (err) {
			ext2_dec_count(old_inode);
			goto out_dir;
		}
		if (dir_de)
			ext2_inc_count(new_dir);
	}

	/*
	 * Like most other Unix systems, set the ctime for inodes on a
 	 * rename.
	 * ext2_dec_count() will mark the inode dirty.
	 */
	old_inode->i_ctime = CURRENT_TIME_SEC;

	ext2_delete_entry (old_de, old_page);
	ext2_dec_count(old_inode);

	if (dir_de) {
		ext2_set_link(old_inode, dir_de, dir_page, new_dir);
		ext2_dec_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;
}

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,
};

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	* viro@parcelfarce.linux.theplanet.co.uk
	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 (card@masi.ibp.fr)
	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 (davem@caip.rutgers.edu), 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 LT	38
	39	/*
	40	* Couple of helper functions - make the code slightly cleaner.
	41	*/
	42
	43	static inline void ext2_inc_count(struct inode *inode)
	44	{
	45	inode->i_nlink++;
	46	mark_inode_dirty(inode);
	47	}
	48
	49	static inline void ext2_dec_count(struct inode *inode)
	50	{
	51	inode->i_nlink--;
	52	mark_inode_dirty(inode);
	53	}
	54
	55	static inline int ext2_add_nondir(struct dentry dentry, struct inode inode)
	56	{
	57	int err = ext2_add_link(dentry, inode);
	58	if (!err) {
	59	d_instantiate(dentry, inode);
	60	return 0;
	61	}
	62	ext2_dec_count(inode);
	63	iput(inode);
	64	return err;
	65	}
	66
	67	/*
	68	* Methods themselves.
	69	*/
	70
	71	static struct dentry ext2_lookup(struct inode dir, struct dentry dentry, struct nameidata nd)
	72	{
	73	struct inode * inode;
	74	ino_t ino;
	75
	76	if (dentry->d_name.len > EXT2_NAME_LEN)
	77	return ERR_PTR(-ENAMETOOLONG);
	78
	79	ino = ext2_inode_by_name(dir, dentry);
	80	inode = NULL;
	81	if (ino) {
	82	inode = iget(dir->i_sb, ino);
	83	if (!inode)
	84	return ERR_PTR(-EACCES);
	85	}
082a05c6	86	return d_splice_alias(inode, dentry);
1da177e4 LT	87	}
	88
	89	struct dentry ext2_get_parent(struct dentry child)
	90	{
	91	unsigned long ino;
	92	struct dentry *parent;
	93	struct inode *inode;
	94	struct dentry dotdot;
	95
	96	dotdot.d_name.name = "..";
	97	dotdot.d_name.len = 2;
	98
	99	ino = ext2_inode_by_name(child->d_inode, &dotdot);
	100	if (!ino)
	101	return ERR_PTR(-ENOENT);
	102	inode = iget(child->d_inode->i_sb, ino);
	103
	104	if (!inode)
	105	return ERR_PTR(-EACCES);
	106	parent = d_alloc_anon(inode);
	107	if (!parent) {
	108	iput(inode);
	109	parent = ERR_PTR(-ENOMEM);
	110	}
	111	return parent;
	112	}
	113
	114	/*
	115	* By the time this is called, we already have created
	116	* the directory cache entry for the new file, but it
	117	* is so far negative - it has no inode.
	118	*
	119	* If the create succeeds, we fill in the inode information
	120	* with d_instantiate().
	121	*/
	122	static int ext2_create (struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd)
	123	{
	124	struct inode * inode = ext2_new_inode (dir, mode);
	125	int err = PTR_ERR(inode);
	126	if (!IS_ERR(inode)) {
	127	inode->i_op = &ext2_file_inode_operations;
6d79125b CO	128	if (ext2_use_xip(inode->i_sb)) {
	129	inode->i_mapping->a_ops = &ext2_aops_xip;
	130	inode->i_fop = &ext2_xip_file_operations;
	131	} else if (test_opt(inode->i_sb, NOBH)) {
1da177e4	132	inode->i_mapping->a_ops = &ext2_nobh_aops;
6d79125b CO	133	inode->i_fop = &ext2_file_operations;
6d79125b CO	134	} else {
1da177e4	135	inode->i_mapping->a_ops = &ext2_aops;
6d79125b CO	136	inode->i_fop = &ext2_file_operations;
6d79125b CO	137	}
1da177e4 LT	138	mark_inode_dirty(inode);
	139	err = ext2_add_nondir(dentry, inode);
	140	}
	141	return err;
	142	}
	143
	144	static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
	145	{
	146	struct inode * inode;
	147	int err;
	148
	149	if (!new_valid_dev(rdev))
	150	return -EINVAL;
	151
	152	inode = ext2_new_inode (dir, mode);
	153	err = PTR_ERR(inode);
	154	if (!IS_ERR(inode)) {
	155	init_special_inode(inode, inode->i_mode, rdev);
	156	#ifdef CONFIG_EXT2_FS_XATTR
	157	inode->i_op = &ext2_special_inode_operations;
	158	#endif
	159	mark_inode_dirty(inode);
	160	err = ext2_add_nondir(dentry, inode);
	161	}
	162	return err;
	163	}
	164
	165	static int ext2_symlink (struct inode * dir, struct dentry * dentry,
	166	const char * symname)
	167	{
	168	struct super_block * sb = dir->i_sb;
	169	int err = -ENAMETOOLONG;
	170	unsigned l = strlen(symname)+1;
	171	struct inode * inode;
	172
	173	if (l > sb->s_blocksize)
	174	goto out;
	175
	176	inode = ext2_new_inode (dir, S_IFLNK \| S_IRWXUGO);
	177	err = PTR_ERR(inode);
	178	if (IS_ERR(inode))
	179	goto out;
	180
	181	if (l > sizeof (EXT2_I(inode)->i_data)) {
	182	/* slow symlink */
	183	inode->i_op = &ext2_symlink_inode_operations;
	184	if (test_opt(inode->i_sb, NOBH))
	185	inode->i_mapping->a_ops = &ext2_nobh_aops;
	186	else
	187	inode->i_mapping->a_ops = &ext2_aops;
	188	err = page_symlink(inode, symname, l);
	189	if (err)
	190	goto out_fail;
	191	} else {
	192	/* fast symlink */
	193	inode->i_op = &ext2_fast_symlink_inode_operations;
	194	memcpy((char*)(EXT2_I(inode)->i_data),symname,l);
	195	inode->i_size = l-1;
	196	}
	197	mark_inode_dirty(inode);
	198
	199	err = ext2_add_nondir(dentry, inode);
	200	out:
	201	return err;
202
203	out_fail:
204	ext2_dec_count(inode);
205	iput (inode);
206	goto out;
207	}
208
209	static int ext2_link (struct dentry * old_dentry, struct inode * dir,
210	struct dentry *dentry)
211	{
212	struct inode *inode = old_dentry->d_inode;
213
214	if (inode->i_nlink >= EXT2_LINK_MAX)
215	return -EMLINK;
216
217	inode->i_ctime = CURRENT_TIME_SEC;
218	ext2_inc_count(inode);
219	atomic_inc(&inode->i_count);
220
221	return ext2_add_nondir(dentry, inode);
222	}
223
224	static int ext2_mkdir(struct inode * dir, struct dentry * dentry, int mode)
225	{
226	struct inode * inode;
227	int err = -EMLINK;
228
229	if (dir->i_nlink >= EXT2_LINK_MAX)
230	goto out;
231
232	ext2_inc_count(dir);
233
234	inode = ext2_new_inode (dir, S_IFDIR \| mode);
235	err = PTR_ERR(inode);
236	if (IS_ERR(inode))
237	goto out_dir;
238
239	inode->i_op = &ext2_dir_inode_operations;
240	inode->i_fop = &ext2_dir_operations;
241	if (test_opt(inode->i_sb, NOBH))
242	inode->i_mapping->a_ops = &ext2_nobh_aops;
243	else
244	inode->i_mapping->a_ops = &ext2_aops;
245
246	ext2_inc_count(inode);
247
248	err = ext2_make_empty(inode, dir);
249	if (err)
250	goto out_fail;
251
252	err = ext2_add_link(dentry, inode);
253	if (err)
254	goto out_fail;
255
256	d_instantiate(dentry, inode);
257	out:
258	return err;
259
260	out_fail:
261	ext2_dec_count(inode);
262	ext2_dec_count(inode);
263	iput(inode);
264	out_dir:
265	ext2_dec_count(dir);
266	goto out;
267	}
268
269	static int ext2_unlink(struct inode * dir, struct dentry *dentry)
270	{
271	struct inode * inode = dentry->d_inode;
272	struct ext2_dir_entry_2 * de;
273	struct page * page;
274	int err = -ENOENT;
275
276	de = ext2_find_entry (dir, dentry, &page);
277	if (!de)
278	goto out;
279
280	err = ext2_delete_entry (de, page);
281	if (err)
282	goto out;
283
284	inode->i_ctime = dir->i_ctime;
285	ext2_dec_count(inode);
286	err = 0;
287	out:
288	return err;
289	}
290
291	static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
292	{
293	struct inode * inode = dentry->d_inode;
294	int err = -ENOTEMPTY;
295
296	if (ext2_empty_dir(inode)) {
297	err = ext2_unlink(dir, dentry);
298	if (!err) {
299	inode->i_size = 0;
300	ext2_dec_count(inode);
301	ext2_dec_count(dir);
302	}
303	}
304	return err;
305	}
306
307	static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
308	struct inode * new_dir, struct dentry * new_dentry )
309	{
310	struct inode * old_inode = old_dentry->d_inode;
311	struct inode * new_inode = new_dentry->d_inode;
312	struct page * dir_page = NULL;
313	struct ext2_dir_entry_2 * dir_de = NULL;
314	struct page * old_page;
315	struct ext2_dir_entry_2 * old_de;
316	int err = -ENOENT;
317
318	old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
319	if (!old_de)
320	goto out;
321
322	if (S_ISDIR(old_inode->i_mode)) {
323	err = -EIO;
324	dir_de = ext2_dotdot(old_inode, &dir_page);
325	if (!dir_de)
326	goto out_old;
327	}
328
329	if (new_inode) {
330	struct page *new_page;
331	struct ext2_dir_entry_2 *new_de;
332
333	err = -ENOTEMPTY;
334	if (dir_de && !ext2_empty_dir (new_inode))
335	goto out_dir;
336
337	err = -ENOENT;
338	new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
339	if (!new_de)
340	goto out_dir;
341	ext2_inc_count(old_inode);
342	ext2_set_link(new_dir, new_de, new_page, old_inode);
343	new_inode->i_ctime = CURRENT_TIME_SEC;
344	if (dir_de)
345	new_inode->i_nlink--;
346	ext2_dec_count(new_inode);
347	} else {
348	if (dir_de) {
349	err = -EMLINK;
350	if (new_dir->i_nlink >= EXT2_LINK_MAX)
351	goto out_dir;
352	}
353	ext2_inc_count(old_inode);
354	err = ext2_add_link(new_dentry, old_inode);
355	if (err) {
356	ext2_dec_count(old_inode);
357	goto out_dir;
358	}
359	if (dir_de)
360	ext2_inc_count(new_dir);
361	}
362
363	/*
364	* Like most other Unix systems, set the ctime for inodes on a
365	* rename.
366	* ext2_dec_count() will mark the inode dirty.
367	*/
368	old_inode->i_ctime = CURRENT_TIME_SEC;
369
370	ext2_delete_entry (old_de, old_page);
371	ext2_dec_count(old_inode);
372
373	if (dir_de) {
374	ext2_set_link(old_inode, dir_de, dir_page, new_dir);
375	ext2_dec_count(old_dir);
376	}
377	return 0;
378
379
380	out_dir:
381	if (dir_de) {
382	kunmap(dir_page);
383	page_cache_release(dir_page);
384	}
385	out_old:
386	kunmap(old_page);
387	page_cache_release(old_page);
388	out:
389	return err;
390	}
391
392	struct inode_operations ext2_dir_inode_operations = {
393	.create = ext2_create,
394	.lookup = ext2_lookup,
395	.link = ext2_link,
396	.unlink = ext2_unlink,
397	.symlink = ext2_symlink,
398	.mkdir = ext2_mkdir,
399	.rmdir = ext2_rmdir,
400	.mknod = ext2_mknod,
401	.rename = ext2_rename,
402	#ifdef CONFIG_EXT2_FS_XATTR
403	.setxattr = generic_setxattr,
404	.getxattr = generic_getxattr,
405	.listxattr = ext2_listxattr,
406	.removexattr = generic_removexattr,
407	#endif
408	.setattr = ext2_setattr,
409	.permission = ext2_permission,
410	};
411
412	struct inode_operations ext2_special_inode_operations = {
413	#ifdef CONFIG_EXT2_FS_XATTR
414	.setxattr = generic_setxattr,
415	.getxattr = generic_getxattr,
416	.listxattr = ext2_listxattr,
417	.removexattr = generic_removexattr,
418	#endif
419	.setattr = ext2_setattr,
420	.permission = ext2_permission,
421	};