[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"

/*
 * 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);
	}
	if (inode)
		return d_splice_alias(inode, dentry);
	d_add(dentry, inode);
	return NULL;
}

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	* [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 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	}
	86	if (inode)
	87	return d_splice_alias(inode, dentry);
	88	d_add(dentry, inode);
	89	return NULL;
	90	}
	91
	92	struct dentry ext2_get_parent(struct dentry child)
	93	{
	94	unsigned long ino;
	95	struct dentry *parent;
	96	struct inode *inode;
	97	struct dentry dotdot;
	98
	99	dotdot.d_name.name = "..";
	100	dotdot.d_name.len = 2;
	101
102	ino = ext2_inode_by_name(child->d_inode, &dotdot);
103	if (!ino)
104	return ERR_PTR(-ENOENT);
105	inode = iget(child->d_inode->i_sb, ino);
106
107	if (!inode)
108	return ERR_PTR(-EACCES);
109	parent = d_alloc_anon(inode);
110	if (!parent) {
111	iput(inode);
112	parent = ERR_PTR(-ENOMEM);
113	}
114	return parent;
115	}
116
117	/*
118	* By the time this is called, we already have created
119	* the directory cache entry for the new file, but it
120	* is so far negative - it has no inode.
121	*
122	* If the create succeeds, we fill in the inode information
123	* with d_instantiate().
124	*/
125	static int ext2_create (struct inode * dir, struct dentry * dentry, int mode, struct nameidata *nd)
126	{
127	struct inode * inode = ext2_new_inode (dir, mode);
128	int err = PTR_ERR(inode);
129	if (!IS_ERR(inode)) {
130	inode->i_op = &ext2_file_inode_operations;
6d79125b CO	131	if (ext2_use_xip(inode->i_sb)) {
	132	inode->i_mapping->a_ops = &ext2_aops_xip;
	133	inode->i_fop = &ext2_xip_file_operations;
	134	} else if (test_opt(inode->i_sb, NOBH)) {
1da177e4	135	inode->i_mapping->a_ops = &ext2_nobh_aops;
6d79125b CO	136	inode->i_fop = &ext2_file_operations;
6d79125b CO	137	} else {
1da177e4	138	inode->i_mapping->a_ops = &ext2_aops;
6d79125b CO	139	inode->i_fop = &ext2_file_operations;
6d79125b CO	140	}
1da177e4 LT	141	mark_inode_dirty(inode);
	142	err = ext2_add_nondir(dentry, inode);
	143	}
	144	return err;
	145	}
	146
	147	static int ext2_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
	148	{
	149	struct inode * inode;
	150	int err;
	151
	152	if (!new_valid_dev(rdev))
	153	return -EINVAL;
	154
	155	inode = ext2_new_inode (dir, mode);
	156	err = PTR_ERR(inode);
	157	if (!IS_ERR(inode)) {
	158	init_special_inode(inode, inode->i_mode, rdev);
	159	#ifdef CONFIG_EXT2_FS_XATTR
	160	inode->i_op = &ext2_special_inode_operations;
	161	#endif
	162	mark_inode_dirty(inode);
	163	err = ext2_add_nondir(dentry, inode);
	164	}
	165	return err;
	166	}
	167
	168	static int ext2_symlink (struct inode * dir, struct dentry * dentry,
	169	const char * symname)
	170	{
	171	struct super_block * sb = dir->i_sb;
	172	int err = -ENAMETOOLONG;
	173	unsigned l = strlen(symname)+1;
	174	struct inode * inode;
	175
	176	if (l > sb->s_blocksize)
	177	goto out;
	178
	179	inode = ext2_new_inode (dir, S_IFLNK \| S_IRWXUGO);
	180	err = PTR_ERR(inode);
	181	if (IS_ERR(inode))
	182	goto out;
	183
	184	if (l > sizeof (EXT2_I(inode)->i_data)) {
	185	/* slow symlink */
	186	inode->i_op = &ext2_symlink_inode_operations;
	187	if (test_opt(inode->i_sb, NOBH))
	188	inode->i_mapping->a_ops = &ext2_nobh_aops;
	189	else
	190	inode->i_mapping->a_ops = &ext2_aops;
	191	err = page_symlink(inode, symname, l);
	192	if (err)
	193	goto out_fail;
	194	} else {
	195	/* fast symlink */
	196	inode->i_op = &ext2_fast_symlink_inode_operations;
	197	memcpy((char*)(EXT2_I(inode)->i_data),symname,l);
	198	inode->i_size = l-1;
	199	}
	200	mark_inode_dirty(inode);
	201
	202	err = ext2_add_nondir(dentry, inode);
	203	out:
	204	return err;
205
206	out_fail:
207	ext2_dec_count(inode);
208	iput (inode);
209	goto out;
210	}
211
212	static int ext2_link (struct dentry * old_dentry, struct inode * dir,
213	struct dentry *dentry)
214	{
215	struct inode *inode = old_dentry->d_inode;
216
217	if (inode->i_nlink >= EXT2_LINK_MAX)
218	return -EMLINK;
219
220	inode->i_ctime = CURRENT_TIME_SEC;
221	ext2_inc_count(inode);
222	atomic_inc(&inode->i_count);
223
224	return ext2_add_nondir(dentry, inode);
225	}
226
227	static int ext2_mkdir(struct inode * dir, struct dentry * dentry, int mode)
228	{
229	struct inode * inode;
230	int err = -EMLINK;
231
232	if (dir->i_nlink >= EXT2_LINK_MAX)
233	goto out;
234
235	ext2_inc_count(dir);
236
237	inode = ext2_new_inode (dir, S_IFDIR \| mode);
238	err = PTR_ERR(inode);
239	if (IS_ERR(inode))
240	goto out_dir;
241
242	inode->i_op = &ext2_dir_inode_operations;
243	inode->i_fop = &ext2_dir_operations;
244	if (test_opt(inode->i_sb, NOBH))
245	inode->i_mapping->a_ops = &ext2_nobh_aops;
246	else
247	inode->i_mapping->a_ops = &ext2_aops;
248
249	ext2_inc_count(inode);
250
251	err = ext2_make_empty(inode, dir);
252	if (err)
253	goto out_fail;
254
255	err = ext2_add_link(dentry, inode);
256	if (err)
257	goto out_fail;
258
259	d_instantiate(dentry, inode);
260	out:
261	return err;
262
263	out_fail:
264	ext2_dec_count(inode);
265	ext2_dec_count(inode);
266	iput(inode);
267	out_dir:
268	ext2_dec_count(dir);
269	goto out;
270	}
271
272	static int ext2_unlink(struct inode * dir, struct dentry *dentry)
273	{
274	struct inode * inode = dentry->d_inode;
275	struct ext2_dir_entry_2 * de;
276	struct page * page;
277	int err = -ENOENT;
278
279	de = ext2_find_entry (dir, dentry, &page);
280	if (!de)
281	goto out;
282
283	err = ext2_delete_entry (de, page);
284	if (err)
285	goto out;
286
287	inode->i_ctime = dir->i_ctime;
288	ext2_dec_count(inode);
289	err = 0;
290	out:
291	return err;
292	}
293
294	static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
295	{
296	struct inode * inode = dentry->d_inode;
297	int err = -ENOTEMPTY;
298
299	if (ext2_empty_dir(inode)) {
300	err = ext2_unlink(dir, dentry);
301	if (!err) {
302	inode->i_size = 0;
303	ext2_dec_count(inode);
304	ext2_dec_count(dir);
305	}
306	}
307	return err;
308	}
309
310	static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
311	struct inode * new_dir, struct dentry * new_dentry )
312	{
313	struct inode * old_inode = old_dentry->d_inode;
314	struct inode * new_inode = new_dentry->d_inode;
315	struct page * dir_page = NULL;
316	struct ext2_dir_entry_2 * dir_de = NULL;
317	struct page * old_page;
318	struct ext2_dir_entry_2 * old_de;
319	int err = -ENOENT;
320
321	old_de = ext2_find_entry (old_dir, old_dentry, &old_page);
322	if (!old_de)
323	goto out;
324
325	if (S_ISDIR(old_inode->i_mode)) {
326	err = -EIO;
327	dir_de = ext2_dotdot(old_inode, &dir_page);
328	if (!dir_de)
329	goto out_old;
330	}
331
332	if (new_inode) {
333	struct page *new_page;
334	struct ext2_dir_entry_2 *new_de;
335
336	err = -ENOTEMPTY;
337	if (dir_de && !ext2_empty_dir (new_inode))
338	goto out_dir;
339
340	err = -ENOENT;
341	new_de = ext2_find_entry (new_dir, new_dentry, &new_page);
342	if (!new_de)
343	goto out_dir;
344	ext2_inc_count(old_inode);
345	ext2_set_link(new_dir, new_de, new_page, old_inode);
346	new_inode->i_ctime = CURRENT_TIME_SEC;
347	if (dir_de)
348	new_inode->i_nlink--;
349	ext2_dec_count(new_inode);
350	} else {
351	if (dir_de) {
352	err = -EMLINK;
353	if (new_dir->i_nlink >= EXT2_LINK_MAX)
354	goto out_dir;
355	}
356	ext2_inc_count(old_inode);
357	err = ext2_add_link(new_dentry, old_inode);
358	if (err) {
359	ext2_dec_count(old_inode);
360	goto out_dir;
361	}
362	if (dir_de)
363	ext2_inc_count(new_dir);
364	}
365
366	/*
367	* Like most other Unix systems, set the ctime for inodes on a
368	* rename.
369	* ext2_dec_count() will mark the inode dirty.
370	*/
371	old_inode->i_ctime = CURRENT_TIME_SEC;
372
373	ext2_delete_entry (old_de, old_page);
374	ext2_dec_count(old_inode);
375
376	if (dir_de) {
377	ext2_set_link(old_inode, dir_de, dir_page, new_dir);
378	ext2_dec_count(old_dir);
379	}
380	return 0;
381
382
383	out_dir:
384	if (dir_de) {
385	kunmap(dir_page);
386	page_cache_release(dir_page);
387	}
388	out_old:
389	kunmap(old_page);
390	page_cache_release(old_page);
391	out:
392	return err;
393	}
394
395	struct inode_operations ext2_dir_inode_operations = {
396	.create = ext2_create,
397	.lookup = ext2_lookup,
398	.link = ext2_link,
399	.unlink = ext2_unlink,
400	.symlink = ext2_symlink,
401	.mkdir = ext2_mkdir,
402	.rmdir = ext2_rmdir,
403	.mknod = ext2_mknod,
404	.rename = ext2_rename,
405	#ifdef CONFIG_EXT2_FS_XATTR
406	.setxattr = generic_setxattr,
407	.getxattr = generic_getxattr,
408	.listxattr = ext2_listxattr,
409	.removexattr = generic_removexattr,
410	#endif
411	.setattr = ext2_setattr,
412	.permission = ext2_permission,
413	};
414
415	struct inode_operations ext2_special_inode_operations = {
416	#ifdef CONFIG_EXT2_FS_XATTR
417	.setxattr = generic_setxattr,
418	.getxattr = generic_getxattr,
419	.listxattr = ext2_listxattr,
420	.removexattr = generic_removexattr,
421	#endif
422	.setattr = ext2_setattr,
423	.permission = ext2_permission,
424	};