[deliverable/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
 * 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 <linux/quotaops.h>
#include "ext2.h"
#include "xattr.h"
#include "acl.h"

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

/*
 * Methods themselves.
 */

static struct dentry *ext2_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
{
	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->d_name);
	inode = NULL;
	if (ino) {
		inode = ext2_iget(dir->i_sb, ino);
		if (inode == ERR_PTR(-ESTALE)) {
			ext2_error(dir->i_sb, __func__,
					"deleted inode referenced: %lu",
					(unsigned long) ino);
			return ERR_PTR(-EIO);
		}
	}
	return d_splice_alias(inode, dentry);
}

struct dentry *ext2_get_parent(struct dentry *child)
{
	struct qstr dotdot = QSTR_INIT("..", 2);
	unsigned long ino = ext2_inode_by_name(d_inode(child), &dotdot);
	if (!ino)
		return ERR_PTR(-ENOENT);
	return d_obtain_alias(ext2_iget(d_inode(child)->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, umode_t mode, bool excl)
{
	struct inode *inode;
	int err;

	err = dquot_initialize(dir);
	if (err)
		return err;

	inode = ext2_new_inode(dir, mode, &dentry->d_name);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &ext2_file_inode_operations;
	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);
	return ext2_add_nondir(dentry, inode);
}

static int ext2_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct inode *inode = ext2_new_inode(dir, mode, NULL);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &ext2_file_inode_operations;
	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);
	d_tmpfile(dentry, inode);
	unlock_new_inode(inode);
	return 0;
}

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

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

	err = dquot_initialize(dir);
	if (err)
		return err;

	inode = ext2_new_inode (dir, mode, &dentry->d_name);
	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;

	err = dquot_initialize(dir);
	if (err)
		goto out;

	inode = ext2_new_inode (dir, S_IFLNK | S_IRWXUGO, &dentry->d_name);
	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;
		inode->i_link = (char*)EXT2_I(inode)->i_data;
		memcpy(inode->i_link, 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);
	unlock_new_inode(inode);
	iput (inode);
	goto out;
}

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

	err = dquot_initialize(dir);
	if (err)
		return err;

	inode->i_ctime = CURRENT_TIME_SEC;
	inode_inc_link_count(inode);
	ihold(inode);

	err = ext2_add_link(dentry, inode);
	if (!err) {
		d_instantiate(dentry, inode);
		return 0;
	}
	inode_dec_link_count(inode);
	iput(inode);
	return err;
}

static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
{
	struct inode * inode;
	int err;

	err = dquot_initialize(dir);
	if (err)
		return err;

	inode_inc_link_count(dir);

	inode = ext2_new_inode(dir, S_IFDIR | mode, &dentry->d_name);
	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;

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

out_fail:
	inode_dec_link_count(inode);
	inode_dec_link_count(inode);
	unlock_new_inode(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 = d_inode(dentry);
	struct ext2_dir_entry_2 * de;
	struct page * page;
	int err;

	err = dquot_initialize(dir);
	if (err)
		goto out;

	de = ext2_find_entry (dir, &dentry->d_name, &page);
	if (!de) {
		err = -ENOENT;
		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 = d_inode(dentry);
	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 = d_inode(old_dentry);
	struct inode * new_inode = d_inode(new_dentry);
	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;

	err = dquot_initialize(old_dir);
	if (err)
		goto out;

	err = dquot_initialize(new_dir);
	if (err)
		goto out;

	old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
	if (!old_de) {
		err = -ENOENT;
		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->d_name, &new_page);
		if (!new_de)
			goto out_dir;
		ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
		new_inode->i_ctime = CURRENT_TIME_SEC;
		if (dir_de)
			drop_nlink(new_inode);
		inode_dec_link_count(new_inode);
	} else {
		err = ext2_add_link(new_dentry, old_inode);
		if (err)
			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.
	 */
	old_inode->i_ctime = CURRENT_TIME_SEC;
	mark_inode_dirty(old_inode);

	ext2_delete_entry (old_de, old_page);

	if (dir_de) {
		if (old_dir != new_dir)
			ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
		else {
			kunmap(dir_page);
			page_cache_release(dir_page);
		}
		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,
	.get_acl	= ext2_get_acl,
	.set_acl	= ext2_set_acl,
	.tmpfile	= ext2_tmpfile,
};

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,
	.get_acl	= ext2_get_acl,
	.set_acl	= ext2_set_acl,
};
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>
907f4554	34	#include <linux/quotaops.h>
1da177e4 LT	35	#include "ext2.h"
	36	#include "xattr.h"
	37	#include "acl.h"
	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) {
41080b5a	43	unlock_new_inode(inode);
8fc37ec5	44	d_instantiate(dentry, inode);
1da177e4 LT	45	return 0;
1da177e4 LT	46	}
a513b035	47	inode_dec_link_count(inode);
41080b5a	48	unlock_new_inode(inode);
1da177e4 LT	49	iput(inode);
	50	return err;
	51	}
	52
	53	/*
	54	* Methods themselves.
	55	*/
	56
00cd8dd3	57	static struct dentry ext2_lookup(struct inode dir, struct dentry *dentry, unsigned int flags)
1da177e4 LT	58	{
	59	struct inode * inode;
	60	ino_t ino;
	61
	62	if (dentry->d_name.len > EXT2_NAME_LEN)
	63	return ERR_PTR(-ENAMETOOLONG);
	64
a9885444	65	ino = ext2_inode_by_name(dir, &dentry->d_name);
1da177e4 LT	66	inode = NULL;
1da177e4 LT	67	if (ino) {
52fcf703	68	inode = ext2_iget(dir->i_sb, ino);
a9049376 AV	69	if (inode == ERR_PTR(-ESTALE)) {
	70	ext2_error(dir->i_sb, __func__,
	71	"deleted inode referenced: %lu",
	72	(unsigned long) ino);
	73	return ERR_PTR(-EIO);
4d6c13f8	74	}
1da177e4	75	}
082a05c6	76	return d_splice_alias(inode, dentry);
1da177e4 LT	77	}
	78
	79	struct dentry ext2_get_parent(struct dentry child)
	80	{
26fe5750	81	struct qstr dotdot = QSTR_INIT("..", 2);
2b0143b5	82	unsigned long ino = ext2_inode_by_name(d_inode(child), &dotdot);
1da177e4 LT	83	if (!ino)
1da177e4 LT	84	return ERR_PTR(-ENOENT);
2b0143b5	85	return d_obtain_alias(ext2_iget(d_inode(child)->i_sb, ino));
1da177e4 LT	86	}
	87
	88	/*
	89	* By the time this is called, we already have created
	90	* the directory cache entry for the new file, but it
	91	* is so far negative - it has no inode.
	92	*
	93	* If the create succeeds, we fill in the inode information
	94	* with d_instantiate().
	95	*/
ebfc3b49	96	static int ext2_create (struct inode * dir, struct dentry * dentry, umode_t mode, bool excl)
1da177e4	97	{
907f4554	98	struct inode *inode;
c2edb305	99	int err;
907f4554	100
c2edb305 JK	101	err = dquot_initialize(dir);
	102	if (err)
	103	return err;
907f4554	104
2a7dba39	105	inode = ext2_new_inode(dir, mode, &dentry->d_name);
907f4554 CH	106	if (IS_ERR(inode))
	107	return PTR_ERR(inode);
	108
	109	inode->i_op = &ext2_file_inode_operations;
be64f884	110	if (test_opt(inode->i_sb, NOBH)) {
907f4554 CH	111	inode->i_mapping->a_ops = &ext2_nobh_aops;
	112	inode->i_fop = &ext2_file_operations;
	113	} else {
	114	inode->i_mapping->a_ops = &ext2_aops;
	115	inode->i_fop = &ext2_file_operations;
1da177e4	116	}
907f4554 CH	117	mark_inode_dirty(inode);
907f4554 CH	118	return ext2_add_nondir(dentry, inode);
1da177e4 LT	119	}
1da177e4 LT	120
60545d0d AV	121	static int ext2_tmpfile(struct inode dir, struct dentry dentry, umode_t mode)
	122	{
	123	struct inode *inode = ext2_new_inode(dir, mode, NULL);
	124	if (IS_ERR(inode))
	125	return PTR_ERR(inode);
	126
	127	inode->i_op = &ext2_file_inode_operations;
be64f884	128	if (test_opt(inode->i_sb, NOBH)) {
60545d0d AV	129	inode->i_mapping->a_ops = &ext2_nobh_aops;
	130	inode->i_fop = &ext2_file_operations;
	131	} else {
	132	inode->i_mapping->a_ops = &ext2_aops;
	133	inode->i_fop = &ext2_file_operations;
	134	}
	135	mark_inode_dirty(inode);
	136	d_tmpfile(dentry, inode);
	137	unlock_new_inode(inode);
	138	return 0;
	139	}
	140
1a67aafb	141	static int ext2_mknod (struct inode * dir, struct dentry *dentry, umode_t mode, dev_t rdev)
1da177e4 LT	142	{
	143	struct inode * inode;
	144	int err;
	145
	146	if (!new_valid_dev(rdev))
	147	return -EINVAL;
	148
c2edb305 JK	149	err = dquot_initialize(dir);
	150	if (err)
	151	return err;
907f4554	152
2a7dba39	153	inode = ext2_new_inode (dir, mode, &dentry->d_name);
1da177e4 LT	154	err = PTR_ERR(inode);
	155	if (!IS_ERR(inode)) {
	156	init_special_inode(inode, inode->i_mode, rdev);
	157	#ifdef CONFIG_EXT2_FS_XATTR
	158	inode->i_op = &ext2_special_inode_operations;
	159	#endif
	160	mark_inode_dirty(inode);
	161	err = ext2_add_nondir(dentry, inode);
	162	}
	163	return err;
	164	}
	165
	166	static int ext2_symlink (struct inode * dir, struct dentry * dentry,
	167	const char * symname)
	168	{
	169	struct super_block * sb = dir->i_sb;
	170	int err = -ENAMETOOLONG;
	171	unsigned l = strlen(symname)+1;
	172	struct inode * inode;
	173
	174	if (l > sb->s_blocksize)
	175	goto out;
	176
c2edb305 JK	177	err = dquot_initialize(dir);
	178	if (err)
	179	goto out;
907f4554	180
2a7dba39	181	inode = ext2_new_inode (dir, S_IFLNK \| S_IRWXUGO, &dentry->d_name);
1da177e4 LT	182	err = PTR_ERR(inode);
	183	if (IS_ERR(inode))
	184	goto out;
	185
	186	if (l > sizeof (EXT2_I(inode)->i_data)) {
	187	/* slow symlink */
	188	inode->i_op = &ext2_symlink_inode_operations;
	189	if (test_opt(inode->i_sb, NOBH))
	190	inode->i_mapping->a_ops = &ext2_nobh_aops;
	191	else
	192	inode->i_mapping->a_ops = &ext2_aops;
	193	err = page_symlink(inode, symname, l);
	194	if (err)
	195	goto out_fail;
	196	} else {
	197	/* fast symlink */
	198	inode->i_op = &ext2_fast_symlink_inode_operations;
cbe0fa38 AV	199	inode->i_link = (char*)EXT2_I(inode)->i_data;
cbe0fa38 AV	200	memcpy(inode->i_link, symname, l);
1da177e4 LT	201	inode->i_size = l-1;
	202	}
	203	mark_inode_dirty(inode);
	204
	205	err = ext2_add_nondir(dentry, inode);
	206	out:
	207	return err;
	208
	209	out_fail:
a513b035	210	inode_dec_link_count(inode);
41080b5a	211	unlock_new_inode(inode);
1da177e4 LT	212	iput (inode);
	213	goto out;
	214	}
	215
	216	static int ext2_link (struct dentry * old_dentry, struct inode * dir,
	217	struct dentry *dentry)
	218	{
2b0143b5	219	struct inode *inode = d_inode(old_dentry);
41080b5a	220	int err;
1da177e4	221
c2edb305 JK	222	err = dquot_initialize(dir);
	223	if (err)
	224	return err;
907f4554	225
1da177e4	226	inode->i_ctime = CURRENT_TIME_SEC;
a513b035	227	inode_inc_link_count(inode);
7de9c6ee	228	ihold(inode);
1da177e4	229
41080b5a AV	230	err = ext2_add_link(dentry, inode);
	231	if (!err) {
	232	d_instantiate(dentry, inode);
	233	return 0;
	234	}
	235	inode_dec_link_count(inode);
	236	iput(inode);
	237	return err;
1da177e4 LT	238	}
1da177e4 LT	239
18bb1db3	240	static int ext2_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
1da177e4 LT	241	{
1da177e4 LT	242	struct inode * inode;
8de52778	243	int err;
1da177e4	244
c2edb305 JK	245	err = dquot_initialize(dir);
	246	if (err)
	247	return err;
907f4554	248
a513b035	249	inode_inc_link_count(dir);
1da177e4	250
2a7dba39	251	inode = ext2_new_inode(dir, S_IFDIR \| mode, &dentry->d_name);
1da177e4 LT	252	err = PTR_ERR(inode);
	253	if (IS_ERR(inode))
	254	goto out_dir;
	255
	256	inode->i_op = &ext2_dir_inode_operations;
	257	inode->i_fop = &ext2_dir_operations;
	258	if (test_opt(inode->i_sb, NOBH))
	259	inode->i_mapping->a_ops = &ext2_nobh_aops;
	260	else
	261	inode->i_mapping->a_ops = &ext2_aops;
	262
a513b035	263	inode_inc_link_count(inode);
1da177e4 LT	264
	265	err = ext2_make_empty(inode, dir);
	266	if (err)
	267	goto out_fail;
	268
	269	err = ext2_add_link(dentry, inode);
	270	if (err)
	271	goto out_fail;
	272
41080b5a	273	unlock_new_inode(inode);
8fc37ec5	274	d_instantiate(dentry, inode);
1da177e4 LT	275	out:
	276	return err;
	277
	278	out_fail:
a513b035 AD	279	inode_dec_link_count(inode);
a513b035 AD	280	inode_dec_link_count(inode);
41080b5a	281	unlock_new_inode(inode);
1da177e4 LT	282	iput(inode);
1da177e4 LT	283	out_dir:
a513b035	284	inode_dec_link_count(dir);
1da177e4 LT	285	goto out;
	286	}
	287
	288	static int ext2_unlink(struct inode * dir, struct dentry *dentry)
	289	{
2b0143b5	290	struct inode * inode = d_inode(dentry);
1da177e4 LT	291	struct ext2_dir_entry_2 * de;
1da177e4 LT	292	struct page * page;
c2edb305	293	int err;
1da177e4	294
c2edb305 JK	295	err = dquot_initialize(dir);
	296	if (err)
	297	goto out;
907f4554	298
a9885444	299	de = ext2_find_entry (dir, &dentry->d_name, &page);
c2edb305 JK	300	if (!de) {
c2edb305 JK	301	err = -ENOENT;
1da177e4	302	goto out;
c2edb305	303	}
1da177e4 LT	304
	305	err = ext2_delete_entry (de, page);
	306	if (err)
	307	goto out;
	308
	309	inode->i_ctime = dir->i_ctime;
a513b035	310	inode_dec_link_count(inode);
1da177e4 LT	311	err = 0;
	312	out:
	313	return err;
	314	}
	315
	316	static int ext2_rmdir (struct inode * dir, struct dentry *dentry)
	317	{
2b0143b5	318	struct inode * inode = d_inode(dentry);
1da177e4 LT	319	int err = -ENOTEMPTY;
	320
	321	if (ext2_empty_dir(inode)) {
	322	err = ext2_unlink(dir, dentry);
	323	if (!err) {
	324	inode->i_size = 0;
a513b035 AD	325	inode_dec_link_count(inode);
a513b035 AD	326	inode_dec_link_count(dir);
1da177e4 LT	327	}
	328	}
	329	return err;
	330	}
	331
	332	static int ext2_rename (struct inode * old_dir, struct dentry * old_dentry,
	333	struct inode * new_dir, struct dentry * new_dentry )
	334	{
2b0143b5 DH	335	struct inode * old_inode = d_inode(old_dentry);
2b0143b5 DH	336	struct inode * new_inode = d_inode(new_dentry);
1da177e4 LT	337	struct page * dir_page = NULL;
	338	struct ext2_dir_entry_2 * dir_de = NULL;
	339	struct page * old_page;
	340	struct ext2_dir_entry_2 * old_de;
c2edb305	341	int err;
1da177e4	342
c2edb305 JK	343	err = dquot_initialize(old_dir);
	344	if (err)
	345	goto out;
	346
	347	err = dquot_initialize(new_dir);
	348	if (err)
	349	goto out;
907f4554	350
a9885444	351	old_de = ext2_find_entry (old_dir, &old_dentry->d_name, &old_page);
c2edb305 JK	352	if (!old_de) {
c2edb305 JK	353	err = -ENOENT;
1da177e4	354	goto out;
c2edb305	355	}
1da177e4 LT	356
	357	if (S_ISDIR(old_inode->i_mode)) {
	358	err = -EIO;
	359	dir_de = ext2_dotdot(old_inode, &dir_page);
	360	if (!dir_de)
	361	goto out_old;
	362	}
	363
	364	if (new_inode) {
	365	struct page *new_page;
	366	struct ext2_dir_entry_2 *new_de;
	367
	368	err = -ENOTEMPTY;
	369	if (dir_de && !ext2_empty_dir (new_inode))
	370	goto out_dir;
	371
	372	err = -ENOENT;
a9885444	373	new_de = ext2_find_entry (new_dir, &new_dentry->d_name, &new_page);
1da177e4 LT	374	if (!new_de)
1da177e4 LT	375	goto out_dir;
39fe7557	376	ext2_set_link(new_dir, new_de, new_page, old_inode, 1);
1da177e4 LT	377	new_inode->i_ctime = CURRENT_TIME_SEC;
1da177e4 LT	378	if (dir_de)
9a53c3a7	379	drop_nlink(new_inode);
a513b035	380	inode_dec_link_count(new_inode);
1da177e4	381	} else {
1da177e4	382	err = ext2_add_link(new_dentry, old_inode);
e8a80c6f	383	if (err)
1da177e4	384	goto out_dir;
1da177e4	385	if (dir_de)
a513b035	386	inode_inc_link_count(new_dir);
1da177e4 LT	387	}
	388
	389	/*
	390	* Like most other Unix systems, set the ctime for inodes on a
	391	* rename.
1da177e4 LT	392	*/
1da177e4 LT	393	old_inode->i_ctime = CURRENT_TIME_SEC;
e8a80c6f	394	mark_inode_dirty(old_inode);
1da177e4 LT	395
1da177e4 LT	396	ext2_delete_entry (old_de, old_page);
1da177e4 LT	397
1da177e4 LT	398	if (dir_de) {
39fe7557 JK	399	if (old_dir != new_dir)
39fe7557 JK	400	ext2_set_link(old_inode, dir_de, dir_page, new_dir, 0);
9de6886e NP	401	else {
	402	kunmap(dir_page);
	403	page_cache_release(dir_page);
	404	}
a513b035	405	inode_dec_link_count(old_dir);
1da177e4 LT	406	}
	407	return 0;
	408
	409
	410	out_dir:
	411	if (dir_de) {
	412	kunmap(dir_page);
	413	page_cache_release(dir_page);
	414	}
	415	out_old:
	416	kunmap(old_page);
	417	page_cache_release(old_page);
	418	out:
	419	return err;
	420	}
	421
754661f1	422	const struct inode_operations ext2_dir_inode_operations = {
1da177e4 LT	423	.create = ext2_create,
	424	.lookup = ext2_lookup,
	425	.link = ext2_link,
	426	.unlink = ext2_unlink,
	427	.symlink = ext2_symlink,
	428	.mkdir = ext2_mkdir,
	429	.rmdir = ext2_rmdir,
	430	.mknod = ext2_mknod,
	431	.rename = ext2_rename,
	432	#ifdef CONFIG_EXT2_FS_XATTR
	433	.setxattr = generic_setxattr,
	434	.getxattr = generic_getxattr,
	435	.listxattr = ext2_listxattr,
	436	.removexattr = generic_removexattr,
	437	#endif
	438	.setattr = ext2_setattr,
4e34e719	439	.get_acl = ext2_get_acl,
64e178a7	440	.set_acl = ext2_set_acl,
60545d0d	441	.tmpfile = ext2_tmpfile,
1da177e4 LT	442	};
1da177e4 LT	443
754661f1	444	const struct inode_operations ext2_special_inode_operations = {
1da177e4 LT	445	#ifdef CONFIG_EXT2_FS_XATTR
	446	.setxattr = generic_setxattr,
	447	.getxattr = generic_getxattr,
	448	.listxattr = ext2_listxattr,
	449	.removexattr = generic_removexattr,
	450	#endif
	451	.setattr = ext2_setattr,
4e34e719	452	.get_acl = ext2_get_acl,
64e178a7	453	.set_acl = ext2_set_acl,
1da177e4	454	};