[deliverable/linux.git] / fs / nilfs2 / namei.c

/*
 * namei.c - NILFS pathname lookup operations.
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Modified for NILFS by Amagai Yoshiji <amagai@osrg.net>,
 *                       Ryusuke Konishi <ryusuke@osrg.net>
 */
/*
 *  linux/fs/ext2/namei.c
 *
 * 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 "nilfs.h"


static inline int nilfs_add_nondir(struct dentry *dentry, struct inode *inode)
{
	int err = nilfs_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 *
nilfs_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
{
	struct inode *inode;
	ino_t ino;

	if (dentry->d_name.len > NILFS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

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

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

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

	ino = nilfs_inode_by_name(child->d_inode, &dotdot);
	if (!ino)
		return ERR_PTR(-ENOENT);

	inode = nilfs_iget(child->d_inode->i_sb, ino);
	if (IS_ERR(inode))
		return ERR_CAST(inode);
	return d_obtain_alias(inode);
}

/*
 * 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 nilfs_create(struct inode *dir, struct dentry *dentry, int mode,
			struct nameidata *nd)
{
	struct inode *inode;
	struct nilfs_transaction_info ti;
	int err;

	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	if (err)
		return err;
	inode = nilfs_new_inode(dir, mode);
	err = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
		inode->i_op = &nilfs_file_inode_operations;
		inode->i_fop = &nilfs_file_operations;
		inode->i_mapping->a_ops = &nilfs_aops;
		mark_inode_dirty(inode);
		err = nilfs_add_nondir(dentry, inode);
	}
	if (!err)
		err = nilfs_transaction_commit(dir->i_sb);
	else
		nilfs_transaction_abort(dir->i_sb);

	return err;
}

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

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

	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	if (err)
		return err;
	inode = nilfs_new_inode(dir, mode);
	err = PTR_ERR(inode);
	if (!IS_ERR(inode)) {
		init_special_inode(inode, inode->i_mode, rdev);
		mark_inode_dirty(inode);
		err = nilfs_add_nondir(dentry, inode);
	}
	if (!err)
		err = nilfs_transaction_commit(dir->i_sb);
	else
		nilfs_transaction_abort(dir->i_sb);

	return err;
}

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

	if (l > sb->s_blocksize)
		return -ENAMETOOLONG;

	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	if (err)
		return err;

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

	/* slow symlink */
	inode->i_op = &nilfs_symlink_inode_operations;
	inode->i_mapping->a_ops = &nilfs_aops;
	err = page_symlink(inode, symname, l);
	if (err)
		goto out_fail;

	/* mark_inode_dirty(inode); */
	/* page_symlink() do this */

	err = nilfs_add_nondir(dentry, inode);
out:
	if (!err)
		err = nilfs_transaction_commit(dir->i_sb);
	else
		nilfs_transaction_abort(dir->i_sb);

	return err;

out_fail:
	drop_nlink(inode);
	mark_inode_dirty(inode);
	iput(inode);
	goto out;
}

static int nilfs_link(struct dentry *old_dentry, struct inode *dir,
		      struct dentry *dentry)
{
	struct inode *inode = old_dentry->d_inode;
	struct nilfs_transaction_info ti;
	int err;

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

	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	if (err)
		return err;

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

	err = nilfs_add_nondir(dentry, inode);
	if (!err)
		err = nilfs_transaction_commit(dir->i_sb);
	else
		nilfs_transaction_abort(dir->i_sb);

	return err;
}

static int nilfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
	struct inode *inode;
	struct nilfs_transaction_info ti;
	int err;

	if (dir->i_nlink >= NILFS_LINK_MAX)
		return -EMLINK;

	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	if (err)
		return err;

	inc_nlink(dir);

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

	inode->i_op = &nilfs_dir_inode_operations;
	inode->i_fop = &nilfs_dir_operations;
	inode->i_mapping->a_ops = &nilfs_aops;

	inc_nlink(inode);

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

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

	mark_inode_dirty(inode);
	d_instantiate(dentry, inode);
out:
	if (!err)
		err = nilfs_transaction_commit(dir->i_sb);
	else
		nilfs_transaction_abort(dir->i_sb);

	return err;

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

static int nilfs_do_unlink(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode;
	struct nilfs_dir_entry *de;
	struct page *page;
	int err;

	err = -ENOENT;
	de = nilfs_find_entry(dir, dentry, &page);
	if (!de)
		goto out;

	inode = dentry->d_inode;
	err = -EIO;
	if (le64_to_cpu(de->inode) != inode->i_ino)
		goto out;

	if (!inode->i_nlink) {
		nilfs_warning(inode->i_sb, __func__,
			      "deleting nonexistent file (%lu), %d\n",
			      inode->i_ino, inode->i_nlink);
		inode->i_nlink = 1;
	}
	err = nilfs_delete_entry(de, page);
	if (err)
		goto out;

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

static int nilfs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct nilfs_transaction_info ti;
	int err;

	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	if (err)
		return err;

	err = nilfs_do_unlink(dir, dentry);

	if (!err) {
		mark_inode_dirty(dir);
		mark_inode_dirty(dentry->d_inode);
		err = nilfs_transaction_commit(dir->i_sb);
	} else
		nilfs_transaction_abort(dir->i_sb);

	return err;
}

static int nilfs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	struct nilfs_transaction_info ti;
	int err;

	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	if (err)
		return err;

	err = -ENOTEMPTY;
	if (nilfs_empty_dir(inode)) {
		err = nilfs_do_unlink(dir, dentry);
		if (!err) {
			inode->i_size = 0;
			drop_nlink(inode);
			mark_inode_dirty(inode);
			drop_nlink(dir);
			mark_inode_dirty(dir);
		}
	}
	if (!err)
		err = nilfs_transaction_commit(dir->i_sb);
	else
		nilfs_transaction_abort(dir->i_sb);

	return err;
}

static int nilfs_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 nilfs_dir_entry *dir_de = NULL;
	struct page *old_page;
	struct nilfs_dir_entry *old_de;
	struct nilfs_transaction_info ti;
	int err;

	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
	if (unlikely(err))
		return err;

	err = -ENOENT;
	old_de = nilfs_find_entry(old_dir, old_dentry, &old_page);
	if (!old_de)
		goto out;

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

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

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

		err = -ENOENT;
		new_de = nilfs_find_entry(new_dir, new_dentry, &new_page);
		if (!new_de)
			goto out_dir;
		inc_nlink(old_inode);
		nilfs_set_link(new_dir, new_de, new_page, old_inode);
		mark_inode_dirty(new_dir);
		new_inode->i_ctime = CURRENT_TIME;
		if (dir_de)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
		mark_inode_dirty(new_inode);
	} else {
		if (dir_de) {
			err = -EMLINK;
			if (new_dir->i_nlink >= NILFS_LINK_MAX)
				goto out_dir;
		}
		inc_nlink(old_inode);
		err = nilfs_add_link(new_dentry, old_inode);
		if (err) {
			drop_nlink(old_inode);
			mark_inode_dirty(old_inode);
			goto out_dir;
		}
		if (dir_de) {
			inc_nlink(new_dir);
			mark_inode_dirty(new_dir);
		}
	}

	/*
	 * Like most other Unix systems, set the ctime for inodes on a
	 * rename.
	 */
	old_inode->i_ctime = CURRENT_TIME;

	nilfs_delete_entry(old_de, old_page);
	drop_nlink(old_inode);

	if (dir_de) {
		nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
		drop_nlink(old_dir);
	}
	mark_inode_dirty(old_dir);
	mark_inode_dirty(old_inode);

	err = nilfs_transaction_commit(old_dir->i_sb);
	return err;

out_dir:
	if (dir_de) {
		kunmap(dir_page);
		page_cache_release(dir_page);
	}
out_old:
	kunmap(old_page);
	page_cache_release(old_page);
out:
	nilfs_transaction_abort(old_dir->i_sb);
	return err;
}

const struct inode_operations nilfs_dir_inode_operations = {
	.create		= nilfs_create,
	.lookup		= nilfs_lookup,
	.link		= nilfs_link,
	.unlink		= nilfs_unlink,
	.symlink	= nilfs_symlink,
	.mkdir		= nilfs_mkdir,
	.rmdir		= nilfs_rmdir,
	.mknod		= nilfs_mknod,
	.rename		= nilfs_rename,
	.setattr	= nilfs_setattr,
	.permission	= nilfs_permission,
};

const struct inode_operations nilfs_special_inode_operations = {
	.setattr	= nilfs_setattr,
	.permission	= nilfs_permission,
};

const struct inode_operations nilfs_symlink_inode_operations = {
	.readlink	= generic_readlink,
	.follow_link	= page_follow_link_light,
	.put_link	= page_put_link,
};
Commit	Line	Data
d2500652 RK	1	/*
	2	* namei.c - NILFS pathname lookup operations.
	3	*
	4	* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*
	20	* Modified for NILFS by Amagai Yoshiji <amagai@osrg.net>,
	21	* Ryusuke Konishi <ryusuke@osrg.net>
	22	*/
	23	/*
	24	* linux/fs/ext2/namei.c
	25	*
	26	* Copyright (C) 1992, 1993, 1994, 1995
	27	* Remy Card (card@masi.ibp.fr)
	28	* Laboratoire MASI - Institut Blaise Pascal
	29	* Universite Pierre et Marie Curie (Paris VI)
	30	*
	31	* from
	32	*
	33	* linux/fs/minix/namei.c
	34	*
	35	* Copyright (C) 1991, 1992 Linus Torvalds
	36	*
	37	* Big-endian to little-endian byte-swapping/bitmaps by
	38	* David S. Miller (davem@caip.rutgers.edu), 1995
	39	*/
	40
	41	#include <linux/pagemap.h>
	42	#include "nilfs.h"
	43
	44
	45	static inline int nilfs_add_nondir(struct dentry dentry, struct inode inode)
	46	{
	47	int err = nilfs_add_link(dentry, inode);
	48	if (!err) {
	49	d_instantiate(dentry, inode);
	50	return 0;
	51	}
	52	inode_dec_link_count(inode);
	53	iput(inode);
	54	return err;
	55	}
	56
	57	/*
	58	* Methods themselves.
	59	*/
	60
	61	static struct dentry *
	62	nilfs_lookup(struct inode dir, struct dentry dentry, struct nameidata *nd)
	63	{
	64	struct inode *inode;
65	ino_t ino;
66
67	if (dentry->d_name.len > NILFS_NAME_LEN)
68	return ERR_PTR(-ENAMETOOLONG);
69
70	ino = nilfs_inode_by_name(dir, dentry);
71	inode = NULL;
72	if (ino) {
73	inode = nilfs_iget(dir->i_sb, ino);
74	if (IS_ERR(inode))
75	return ERR_CAST(inode);
76	}
77	return d_splice_alias(inode, dentry);
78	}
79
80	struct dentry nilfs_get_parent(struct dentry child)
81	{
82	unsigned long ino;
83	struct inode *inode;
84	struct dentry dotdot;
85
86	dotdot.d_name.name = "..";
87	dotdot.d_name.len = 2;
88
89	ino = nilfs_inode_by_name(child->d_inode, &dotdot);
90	if (!ino)
91	return ERR_PTR(-ENOENT);
92
93	inode = nilfs_iget(child->d_inode->i_sb, ino);
94	if (IS_ERR(inode))
95	return ERR_CAST(inode);
96	return d_obtain_alias(inode);
97	}
98
99	/*
100	* By the time this is called, we already have created
101	* the directory cache entry for the new file, but it
102	* is so far negative - it has no inode.
103	*
104	* If the create succeeds, we fill in the inode information
105	* with d_instantiate().
106	*/
107	static int nilfs_create(struct inode dir, struct dentry dentry, int mode,
108	struct nameidata *nd)
109	{
110	struct inode *inode;
111	struct nilfs_transaction_info ti;
47420c79	112	int err;
d2500652 RK	113
	114	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	115	if (err)
	116	return err;
	117	inode = nilfs_new_inode(dir, mode);
	118	err = PTR_ERR(inode);
	119	if (!IS_ERR(inode)) {
	120	inode->i_op = &nilfs_file_inode_operations;
	121	inode->i_fop = &nilfs_file_operations;
	122	inode->i_mapping->a_ops = &nilfs_aops;
	123	mark_inode_dirty(inode);
	124	err = nilfs_add_nondir(dentry, inode);
	125	}
47420c79 RK	126	if (!err)
	127	err = nilfs_transaction_commit(dir->i_sb);
	128	else
	129	nilfs_transaction_abort(dir->i_sb);
	130
	131	return err;
d2500652 RK	132	}
	133
	134	static int
	135	nilfs_mknod(struct inode dir, struct dentry dentry, int mode, dev_t rdev)
	136	{
	137	struct inode *inode;
	138	struct nilfs_transaction_info ti;
47420c79	139	int err;
d2500652 RK	140
	141	if (!new_valid_dev(rdev))
	142	return -EINVAL;
	143
	144	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	145	if (err)
	146	return err;
	147	inode = nilfs_new_inode(dir, mode);
	148	err = PTR_ERR(inode);
	149	if (!IS_ERR(inode)) {
	150	init_special_inode(inode, inode->i_mode, rdev);
	151	mark_inode_dirty(inode);
	152	err = nilfs_add_nondir(dentry, inode);
	153	}
47420c79 RK	154	if (!err)
	155	err = nilfs_transaction_commit(dir->i_sb);
	156	else
	157	nilfs_transaction_abort(dir->i_sb);
	158
	159	return err;
d2500652 RK	160	}
	161
	162	static int nilfs_symlink(struct inode dir, struct dentry dentry,
	163	const char *symname)
	164	{
	165	struct nilfs_transaction_info ti;
	166	struct super_block *sb = dir->i_sb;
	167	unsigned l = strlen(symname)+1;
	168	struct inode *inode;
47420c79	169	int err;
d2500652 RK	170
	171	if (l > sb->s_blocksize)
	172	return -ENAMETOOLONG;
	173
	174	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	175	if (err)
	176	return err;
	177
	178	inode = nilfs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	179	err = PTR_ERR(inode);
	180	if (IS_ERR(inode))
	181	goto out;
	182
	183	/* slow symlink */
	184	inode->i_op = &nilfs_symlink_inode_operations;
	185	inode->i_mapping->a_ops = &nilfs_aops;
	186	err = page_symlink(inode, symname, l);
	187	if (err)
	188	goto out_fail;
	189
	190	/* mark_inode_dirty(inode); */
9ca941d4	191	/* page_symlink() do this */
d2500652 RK	192
	193	err = nilfs_add_nondir(dentry, inode);
	194	out:
47420c79 RK	195	if (!err)
	196	err = nilfs_transaction_commit(dir->i_sb);
	197	else
	198	nilfs_transaction_abort(dir->i_sb);
	199
	200	return err;
d2500652 RK	201
d2500652 RK	202	out_fail:
565de406 JS	203	drop_nlink(inode);
565de406 JS	204	mark_inode_dirty(inode);
d2500652 RK	205	iput(inode);
	206	goto out;
	207	}
	208
	209	static int nilfs_link(struct dentry old_dentry, struct inode dir,
	210	struct dentry *dentry)
	211	{
	212	struct inode *inode = old_dentry->d_inode;
	213	struct nilfs_transaction_info ti;
47420c79	214	int err;
d2500652 RK	215
	216	if (inode->i_nlink >= NILFS_LINK_MAX)
	217	return -EMLINK;
	218
	219	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	220	if (err)
	221	return err;
	222
	223	inode->i_ctime = CURRENT_TIME;
	224	inode_inc_link_count(inode);
	225	atomic_inc(&inode->i_count);
	226
	227	err = nilfs_add_nondir(dentry, inode);
47420c79 RK	228	if (!err)
	229	err = nilfs_transaction_commit(dir->i_sb);
	230	else
	231	nilfs_transaction_abort(dir->i_sb);
	232
	233	return err;
d2500652 RK	234	}
	235
	236	static int nilfs_mkdir(struct inode dir, struct dentry dentry, int mode)
	237	{
	238	struct inode *inode;
	239	struct nilfs_transaction_info ti;
47420c79	240	int err;
d2500652 RK	241
	242	if (dir->i_nlink >= NILFS_LINK_MAX)
	243	return -EMLINK;
	244
	245	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	246	if (err)
	247	return err;
	248
565de406	249	inc_nlink(dir);
d2500652 RK	250
	251	inode = nilfs_new_inode(dir, S_IFDIR \| mode);
	252	err = PTR_ERR(inode);
	253	if (IS_ERR(inode))
	254	goto out_dir;
	255
	256	inode->i_op = &nilfs_dir_inode_operations;
	257	inode->i_fop = &nilfs_dir_operations;
	258	inode->i_mapping->a_ops = &nilfs_aops;
	259
565de406	260	inc_nlink(inode);
d2500652 RK	261
	262	err = nilfs_make_empty(inode, dir);
	263	if (err)
	264	goto out_fail;
	265
	266	err = nilfs_add_link(dentry, inode);
	267	if (err)
	268	goto out_fail;
	269
58d55471	270	mark_inode_dirty(inode);
d2500652 RK	271	d_instantiate(dentry, inode);
d2500652 RK	272	out:
47420c79 RK	273	if (!err)
	274	err = nilfs_transaction_commit(dir->i_sb);
	275	else
	276	nilfs_transaction_abort(dir->i_sb);
	277
	278	return err;
d2500652 RK	279
d2500652 RK	280	out_fail:
565de406	281	drop_nlink(inode);
565de406 JS	282	drop_nlink(inode);
565de406 JS	283	mark_inode_dirty(inode);
d2500652 RK	284	iput(inode);
d2500652 RK	285	out_dir:
565de406 JS	286	drop_nlink(dir);
565de406 JS	287	mark_inode_dirty(dir);
d2500652 RK	288	goto out;
	289	}
	290
4cd76c3c	291	static int nilfs_do_unlink(struct inode dir, struct dentry dentry)
d2500652 RK	292	{
	293	struct inode *inode;
	294	struct nilfs_dir_entry *de;
	295	struct page *page;
47420c79	296	int err;
d2500652	297
d2500652 RK	298	err = -ENOENT;
	299	de = nilfs_find_entry(dir, dentry, &page);
	300	if (!de)
	301	goto out;
	302
	303	inode = dentry->d_inode;
	304	err = -EIO;
	305	if (le64_to_cpu(de->inode) != inode->i_ino)
	306	goto out;
	307
	308	if (!inode->i_nlink) {
	309	nilfs_warning(inode->i_sb, __func__,
	310	"deleting nonexistent file (%lu), %d\n",
	311	inode->i_ino, inode->i_nlink);
	312	inode->i_nlink = 1;
	313	}
	314	err = nilfs_delete_entry(de, page);
	315	if (err)
	316	goto out;
	317
	318	inode->i_ctime = dir->i_ctime;
565de406	319	drop_nlink(inode);
d2500652 RK	320	err = 0;
d2500652 RK	321	out:
4cd76c3c JS	322	return err;
	323	}
	324
	325	static int nilfs_unlink(struct inode dir, struct dentry dentry)
	326	{
	327	struct nilfs_transaction_info ti;
	328	int err;
	329
	330	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	331	if (err)
	332	return err;
	333
	334	err = nilfs_do_unlink(dir, dentry);
	335
	336	if (!err) {
3534573b	337	mark_inode_dirty(dir);
4cd76c3c	338	mark_inode_dirty(dentry->d_inode);
47420c79	339	err = nilfs_transaction_commit(dir->i_sb);
4cd76c3c	340	} else
47420c79 RK	341	nilfs_transaction_abort(dir->i_sb);
	342
	343	return err;
d2500652 RK	344	}
	345
	346	static int nilfs_rmdir(struct inode dir, struct dentry dentry)
	347	{
	348	struct inode *inode = dentry->d_inode;
	349	struct nilfs_transaction_info ti;
47420c79	350	int err;
d2500652 RK	351
	352	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	353	if (err)
	354	return err;
	355
	356	err = -ENOTEMPTY;
	357	if (nilfs_empty_dir(inode)) {
4cd76c3c	358	err = nilfs_do_unlink(dir, dentry);
d2500652 RK	359	if (!err) {
d2500652 RK	360	inode->i_size = 0;
565de406 JS	361	drop_nlink(inode);
	362	mark_inode_dirty(inode);
	363	drop_nlink(dir);
	364	mark_inode_dirty(dir);
d2500652 RK	365	}
d2500652 RK	366	}
47420c79 RK	367	if (!err)
	368	err = nilfs_transaction_commit(dir->i_sb);
	369	else
	370	nilfs_transaction_abort(dir->i_sb);
	371
	372	return err;
d2500652 RK	373	}
	374
	375	static int nilfs_rename(struct inode old_dir, struct dentry old_dentry,
	376	struct inode new_dir, struct dentry new_dentry)
	377	{
	378	struct inode *old_inode = old_dentry->d_inode;
	379	struct inode *new_inode = new_dentry->d_inode;
	380	struct page *dir_page = NULL;
	381	struct nilfs_dir_entry *dir_de = NULL;
	382	struct page *old_page;
	383	struct nilfs_dir_entry *old_de;
	384	struct nilfs_transaction_info ti;
	385	int err;
	386
	387	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
	388	if (unlikely(err))
	389	return err;
	390
	391	err = -ENOENT;
	392	old_de = nilfs_find_entry(old_dir, old_dentry, &old_page);
	393	if (!old_de)
	394	goto out;
	395
	396	if (S_ISDIR(old_inode->i_mode)) {
	397	err = -EIO;
	398	dir_de = nilfs_dotdot(old_inode, &dir_page);
	399	if (!dir_de)
	400	goto out_old;
	401	}
	402
	403	if (new_inode) {
	404	struct page *new_page;
	405	struct nilfs_dir_entry *new_de;
	406
	407	err = -ENOTEMPTY;
	408	if (dir_de && !nilfs_empty_dir(new_inode))
	409	goto out_dir;
	410
	411	err = -ENOENT;
	412	new_de = nilfs_find_entry(new_dir, new_dentry, &new_page);
	413	if (!new_de)
	414	goto out_dir;
565de406	415	inc_nlink(old_inode);
d2500652	416	nilfs_set_link(new_dir, new_de, new_page, old_inode);
43f8bc26	417	mark_inode_dirty(new_dir);
d2500652 RK	418	new_inode->i_ctime = CURRENT_TIME;
	419	if (dir_de)
	420	drop_nlink(new_inode);
565de406 JS	421	drop_nlink(new_inode);
565de406 JS	422	mark_inode_dirty(new_inode);
d2500652 RK	423	} else {
	424	if (dir_de) {
	425	err = -EMLINK;
	426	if (new_dir->i_nlink >= NILFS_LINK_MAX)
	427	goto out_dir;
	428	}
565de406	429	inc_nlink(old_inode);
d2500652 RK	430	err = nilfs_add_link(new_dentry, old_inode);
d2500652 RK	431	if (err) {
565de406 JS	432	drop_nlink(old_inode);
565de406 JS	433	mark_inode_dirty(old_inode);
d2500652 RK	434	goto out_dir;
d2500652 RK	435	}
565de406 JS	436	if (dir_de) {
	437	inc_nlink(new_dir);
	438	mark_inode_dirty(new_dir);
	439	}
d2500652 RK	440	}
	441
	442	/*
	443	* Like most other Unix systems, set the ctime for inodes on a
	444	* rename.
d2500652 RK	445	*/
	446	old_inode->i_ctime = CURRENT_TIME;
	447
	448	nilfs_delete_entry(old_de, old_page);
43f8bc26	449	drop_nlink(old_inode);
d2500652 RK	450
	451	if (dir_de) {
	452	nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
565de406	453	drop_nlink(old_dir);
d2500652	454	}
3534573b	455	mark_inode_dirty(old_dir);
43f8bc26	456	mark_inode_dirty(old_inode);
d2500652	457
47420c79	458	err = nilfs_transaction_commit(old_dir->i_sb);
d2500652 RK	459	return err;
	460
	461	out_dir:
	462	if (dir_de) {
	463	kunmap(dir_page);
	464	page_cache_release(dir_page);
	465	}
	466	out_old:
	467	kunmap(old_page);
	468	page_cache_release(old_page);
	469	out:
47420c79	470	nilfs_transaction_abort(old_dir->i_sb);
d2500652 RK	471	return err;
	472	}
	473
6e1d5dcc	474	const struct inode_operations nilfs_dir_inode_operations = {
d2500652 RK	475	.create = nilfs_create,
	476	.lookup = nilfs_lookup,
	477	.link = nilfs_link,
	478	.unlink = nilfs_unlink,
	479	.symlink = nilfs_symlink,
	480	.mkdir = nilfs_mkdir,
	481	.rmdir = nilfs_rmdir,
	482	.mknod = nilfs_mknod,
	483	.rename = nilfs_rename,
	484	.setattr = nilfs_setattr,
	485	.permission = nilfs_permission,
	486	};
	487
6e1d5dcc	488	const struct inode_operations nilfs_special_inode_operations = {
d2500652 RK	489	.setattr = nilfs_setattr,
	490	.permission = nilfs_permission,
	491	};
	492
6e1d5dcc	493	const struct inode_operations nilfs_symlink_inode_operations = {
d2500652 RK	494	.readlink = generic_readlink,
	495	.follow_link = page_follow_link_light,
	496	.put_link = page_put_link,
	497	};