[net-next-2.6.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->d_name);
	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 qstr dotdot = {.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;
		nilfs_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);
		nilfs_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);
	nilfs_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;

	nilfs_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);
	nilfs_mark_inode_dirty(inode);
	iput(inode);
out_dir:
	drop_nlink(dir);
	nilfs_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->d_name, &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) {
		nilfs_mark_inode_dirty(dir);
		nilfs_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);
			nilfs_mark_inode_dirty(inode);
			drop_nlink(dir);
			nilfs_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->d_name, &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->d_name, &new_page);
		if (!new_de)
			goto out_dir;
		inc_nlink(old_inode);
		nilfs_set_link(new_dir, new_de, new_page, old_inode);
		nilfs_mark_inode_dirty(new_dir);
		new_inode->i_ctime = CURRENT_TIME;
		if (dir_de)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
		nilfs_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);
			nilfs_mark_inode_dirty(old_inode);
			goto out_dir;
		}
		if (dir_de) {
			inc_nlink(new_dir);
			nilfs_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);
	}
	nilfs_mark_inode_dirty(old_dir);
	nilfs_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
0319003d	70	ino = nilfs_inode_by_name(dir, &dentry->d_name);
d2500652 RK	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;
0319003d	84	struct qstr dotdot = {.name = "..", .len = 2};
d2500652 RK	85
	86	ino = nilfs_inode_by_name(child->d_inode, &dotdot);
	87	if (!ino)
	88	return ERR_PTR(-ENOENT);
	89
	90	inode = nilfs_iget(child->d_inode->i_sb, ino);
	91	if (IS_ERR(inode))
	92	return ERR_CAST(inode);
	93	return d_obtain_alias(inode);
	94	}
	95
	96	/*
	97	* By the time this is called, we already have created
	98	* the directory cache entry for the new file, but it
	99	* is so far negative - it has no inode.
	100	*
	101	* If the create succeeds, we fill in the inode information
	102	* with d_instantiate().
	103	*/
	104	static int nilfs_create(struct inode dir, struct dentry dentry, int mode,
	105	struct nameidata *nd)
	106	{
	107	struct inode *inode;
	108	struct nilfs_transaction_info ti;
47420c79	109	int err;
d2500652 RK	110
	111	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	112	if (err)
	113	return err;
	114	inode = nilfs_new_inode(dir, mode);
	115	err = PTR_ERR(inode);
	116	if (!IS_ERR(inode)) {
	117	inode->i_op = &nilfs_file_inode_operations;
	118	inode->i_fop = &nilfs_file_operations;
	119	inode->i_mapping->a_ops = &nilfs_aops;
abdb318b	120	nilfs_mark_inode_dirty(inode);
d2500652 RK	121	err = nilfs_add_nondir(dentry, inode);
d2500652 RK	122	}
47420c79 RK	123	if (!err)
	124	err = nilfs_transaction_commit(dir->i_sb);
	125	else
	126	nilfs_transaction_abort(dir->i_sb);
	127
	128	return err;
d2500652 RK	129	}
	130
	131	static int
	132	nilfs_mknod(struct inode dir, struct dentry dentry, int mode, dev_t rdev)
	133	{
	134	struct inode *inode;
	135	struct nilfs_transaction_info ti;
47420c79	136	int err;
d2500652 RK	137
	138	if (!new_valid_dev(rdev))
	139	return -EINVAL;
	140
	141	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	142	if (err)
	143	return err;
	144	inode = nilfs_new_inode(dir, mode);
	145	err = PTR_ERR(inode);
	146	if (!IS_ERR(inode)) {
	147	init_special_inode(inode, inode->i_mode, rdev);
abdb318b	148	nilfs_mark_inode_dirty(inode);
d2500652 RK	149	err = nilfs_add_nondir(dentry, inode);
d2500652 RK	150	}
47420c79 RK	151	if (!err)
	152	err = nilfs_transaction_commit(dir->i_sb);
	153	else
	154	nilfs_transaction_abort(dir->i_sb);
	155
	156	return err;
d2500652 RK	157	}
	158
	159	static int nilfs_symlink(struct inode dir, struct dentry dentry,
	160	const char *symname)
	161	{
	162	struct nilfs_transaction_info ti;
	163	struct super_block *sb = dir->i_sb;
	164	unsigned l = strlen(symname)+1;
	165	struct inode *inode;
47420c79	166	int err;
d2500652 RK	167
	168	if (l > sb->s_blocksize)
	169	return -ENAMETOOLONG;
	170
	171	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	172	if (err)
	173	return err;
	174
	175	inode = nilfs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	176	err = PTR_ERR(inode);
	177	if (IS_ERR(inode))
	178	goto out;
	179
	180	/* slow symlink */
	181	inode->i_op = &nilfs_symlink_inode_operations;
	182	inode->i_mapping->a_ops = &nilfs_aops;
	183	err = page_symlink(inode, symname, l);
	184	if (err)
	185	goto out_fail;
	186
	187	/* mark_inode_dirty(inode); */
9ca941d4	188	/* page_symlink() do this */
d2500652 RK	189
	190	err = nilfs_add_nondir(dentry, inode);
	191	out:
47420c79 RK	192	if (!err)
	193	err = nilfs_transaction_commit(dir->i_sb);
	194	else
	195	nilfs_transaction_abort(dir->i_sb);
	196
	197	return err;
d2500652 RK	198
d2500652 RK	199	out_fail:
565de406	200	drop_nlink(inode);
abdb318b	201	nilfs_mark_inode_dirty(inode);
d2500652 RK	202	iput(inode);
	203	goto out;
	204	}
	205
	206	static int nilfs_link(struct dentry old_dentry, struct inode dir,
	207	struct dentry *dentry)
	208	{
	209	struct inode *inode = old_dentry->d_inode;
	210	struct nilfs_transaction_info ti;
47420c79	211	int err;
d2500652 RK	212
	213	if (inode->i_nlink >= NILFS_LINK_MAX)
	214	return -EMLINK;
	215
	216	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	217	if (err)
	218	return err;
	219
	220	inode->i_ctime = CURRENT_TIME;
	221	inode_inc_link_count(inode);
	222	atomic_inc(&inode->i_count);
	223
	224	err = nilfs_add_nondir(dentry, inode);
47420c79 RK	225	if (!err)
	226	err = nilfs_transaction_commit(dir->i_sb);
	227	else
	228	nilfs_transaction_abort(dir->i_sb);
	229
	230	return err;
d2500652 RK	231	}
	232
	233	static int nilfs_mkdir(struct inode dir, struct dentry dentry, int mode)
	234	{
	235	struct inode *inode;
	236	struct nilfs_transaction_info ti;
47420c79	237	int err;
d2500652 RK	238
	239	if (dir->i_nlink >= NILFS_LINK_MAX)
	240	return -EMLINK;
	241
	242	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	243	if (err)
	244	return err;
	245
565de406	246	inc_nlink(dir);
d2500652 RK	247
	248	inode = nilfs_new_inode(dir, S_IFDIR \| mode);
	249	err = PTR_ERR(inode);
	250	if (IS_ERR(inode))
	251	goto out_dir;
	252
	253	inode->i_op = &nilfs_dir_inode_operations;
	254	inode->i_fop = &nilfs_dir_operations;
	255	inode->i_mapping->a_ops = &nilfs_aops;
	256
565de406	257	inc_nlink(inode);
d2500652 RK	258
	259	err = nilfs_make_empty(inode, dir);
	260	if (err)
	261	goto out_fail;
	262
	263	err = nilfs_add_link(dentry, inode);
	264	if (err)
	265	goto out_fail;
	266
abdb318b	267	nilfs_mark_inode_dirty(inode);
d2500652 RK	268	d_instantiate(dentry, inode);
d2500652 RK	269	out:
47420c79 RK	270	if (!err)
	271	err = nilfs_transaction_commit(dir->i_sb);
	272	else
	273	nilfs_transaction_abort(dir->i_sb);
	274
	275	return err;
d2500652 RK	276
d2500652 RK	277	out_fail:
565de406	278	drop_nlink(inode);
565de406	279	drop_nlink(inode);
abdb318b	280	nilfs_mark_inode_dirty(inode);
d2500652 RK	281	iput(inode);
d2500652 RK	282	out_dir:
565de406	283	drop_nlink(dir);
abdb318b	284	nilfs_mark_inode_dirty(dir);
d2500652 RK	285	goto out;
	286	}
	287
4cd76c3c	288	static int nilfs_do_unlink(struct inode dir, struct dentry dentry)
d2500652 RK	289	{
	290	struct inode *inode;
	291	struct nilfs_dir_entry *de;
	292	struct page *page;
47420c79	293	int err;
d2500652	294
d2500652	295	err = -ENOENT;
0319003d	296	de = nilfs_find_entry(dir, &dentry->d_name, &page);
d2500652 RK	297	if (!de)
	298	goto out;
	299
	300	inode = dentry->d_inode;
	301	err = -EIO;
	302	if (le64_to_cpu(de->inode) != inode->i_ino)
	303	goto out;
	304
	305	if (!inode->i_nlink) {
	306	nilfs_warning(inode->i_sb, __func__,
	307	"deleting nonexistent file (%lu), %d\n",
	308	inode->i_ino, inode->i_nlink);
	309	inode->i_nlink = 1;
	310	}
	311	err = nilfs_delete_entry(de, page);
	312	if (err)
	313	goto out;
	314
	315	inode->i_ctime = dir->i_ctime;
565de406	316	drop_nlink(inode);
d2500652 RK	317	err = 0;
d2500652 RK	318	out:
4cd76c3c JS	319	return err;
	320	}
	321
	322	static int nilfs_unlink(struct inode dir, struct dentry dentry)
	323	{
	324	struct nilfs_transaction_info ti;
	325	int err;
	326
	327	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	328	if (err)
	329	return err;
	330
	331	err = nilfs_do_unlink(dir, dentry);
	332
	333	if (!err) {
abdb318b JS	334	nilfs_mark_inode_dirty(dir);
abdb318b JS	335	nilfs_mark_inode_dirty(dentry->d_inode);
47420c79	336	err = nilfs_transaction_commit(dir->i_sb);
4cd76c3c	337	} else
47420c79 RK	338	nilfs_transaction_abort(dir->i_sb);
	339
	340	return err;
d2500652 RK	341	}
	342
	343	static int nilfs_rmdir(struct inode dir, struct dentry dentry)
	344	{
	345	struct inode *inode = dentry->d_inode;
	346	struct nilfs_transaction_info ti;
47420c79	347	int err;
d2500652 RK	348
	349	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	350	if (err)
	351	return err;
	352
	353	err = -ENOTEMPTY;
	354	if (nilfs_empty_dir(inode)) {
4cd76c3c	355	err = nilfs_do_unlink(dir, dentry);
d2500652 RK	356	if (!err) {
d2500652 RK	357	inode->i_size = 0;
565de406	358	drop_nlink(inode);
abdb318b	359	nilfs_mark_inode_dirty(inode);
565de406	360	drop_nlink(dir);
abdb318b	361	nilfs_mark_inode_dirty(dir);
d2500652 RK	362	}
d2500652 RK	363	}
47420c79 RK	364	if (!err)
	365	err = nilfs_transaction_commit(dir->i_sb);
	366	else
	367	nilfs_transaction_abort(dir->i_sb);
	368
	369	return err;
d2500652 RK	370	}
	371
	372	static int nilfs_rename(struct inode old_dir, struct dentry old_dentry,
	373	struct inode new_dir, struct dentry new_dentry)
	374	{
	375	struct inode *old_inode = old_dentry->d_inode;
	376	struct inode *new_inode = new_dentry->d_inode;
	377	struct page *dir_page = NULL;
	378	struct nilfs_dir_entry *dir_de = NULL;
	379	struct page *old_page;
	380	struct nilfs_dir_entry *old_de;
	381	struct nilfs_transaction_info ti;
	382	int err;
	383
	384	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
	385	if (unlikely(err))
	386	return err;
	387
	388	err = -ENOENT;
0319003d	389	old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
d2500652 RK	390	if (!old_de)
	391	goto out;
	392
	393	if (S_ISDIR(old_inode->i_mode)) {
	394	err = -EIO;
	395	dir_de = nilfs_dotdot(old_inode, &dir_page);
	396	if (!dir_de)
	397	goto out_old;
	398	}
	399
	400	if (new_inode) {
	401	struct page *new_page;
	402	struct nilfs_dir_entry *new_de;
	403
	404	err = -ENOTEMPTY;
	405	if (dir_de && !nilfs_empty_dir(new_inode))
	406	goto out_dir;
	407
	408	err = -ENOENT;
0319003d	409	new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
d2500652 RK	410	if (!new_de)
d2500652 RK	411	goto out_dir;
565de406	412	inc_nlink(old_inode);
d2500652	413	nilfs_set_link(new_dir, new_de, new_page, old_inode);
abdb318b	414	nilfs_mark_inode_dirty(new_dir);
d2500652 RK	415	new_inode->i_ctime = CURRENT_TIME;
	416	if (dir_de)
	417	drop_nlink(new_inode);
565de406	418	drop_nlink(new_inode);
abdb318b	419	nilfs_mark_inode_dirty(new_inode);
d2500652 RK	420	} else {
	421	if (dir_de) {
	422	err = -EMLINK;
	423	if (new_dir->i_nlink >= NILFS_LINK_MAX)
	424	goto out_dir;
	425	}
565de406	426	inc_nlink(old_inode);
d2500652 RK	427	err = nilfs_add_link(new_dentry, old_inode);
d2500652 RK	428	if (err) {
565de406	429	drop_nlink(old_inode);
abdb318b	430	nilfs_mark_inode_dirty(old_inode);
d2500652 RK	431	goto out_dir;
d2500652 RK	432	}
565de406 JS	433	if (dir_de) {
565de406 JS	434	inc_nlink(new_dir);
abdb318b	435	nilfs_mark_inode_dirty(new_dir);
565de406	436	}
d2500652 RK	437	}
	438
	439	/*
	440	* Like most other Unix systems, set the ctime for inodes on a
	441	* rename.
d2500652 RK	442	*/
	443	old_inode->i_ctime = CURRENT_TIME;
	444
	445	nilfs_delete_entry(old_de, old_page);
43f8bc26	446	drop_nlink(old_inode);
d2500652 RK	447
	448	if (dir_de) {
	449	nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
565de406	450	drop_nlink(old_dir);
d2500652	451	}
abdb318b JS	452	nilfs_mark_inode_dirty(old_dir);
abdb318b JS	453	nilfs_mark_inode_dirty(old_inode);
d2500652	454
47420c79	455	err = nilfs_transaction_commit(old_dir->i_sb);
d2500652 RK	456	return err;
	457
	458	out_dir:
	459	if (dir_de) {
	460	kunmap(dir_page);
	461	page_cache_release(dir_page);
	462	}
	463	out_old:
	464	kunmap(old_page);
	465	page_cache_release(old_page);
	466	out:
47420c79	467	nilfs_transaction_abort(old_dir->i_sb);
d2500652 RK	468	return err;
	469	}
	470
6e1d5dcc	471	const struct inode_operations nilfs_dir_inode_operations = {
d2500652 RK	472	.create = nilfs_create,
	473	.lookup = nilfs_lookup,
	474	.link = nilfs_link,
	475	.unlink = nilfs_unlink,
	476	.symlink = nilfs_symlink,
	477	.mkdir = nilfs_mkdir,
	478	.rmdir = nilfs_rmdir,
	479	.mknod = nilfs_mknod,
	480	.rename = nilfs_rename,
	481	.setattr = nilfs_setattr,
	482	.permission = nilfs_permission,
	483	};
	484
6e1d5dcc	485	const struct inode_operations nilfs_special_inode_operations = {
d2500652 RK	486	.setattr = nilfs_setattr,
	487	.permission = nilfs_permission,
	488	};
	489
6e1d5dcc	490	const struct inode_operations nilfs_symlink_inode_operations = {
d2500652 RK	491	.readlink = generic_readlink,
	492	.follow_link = page_follow_link_light,
	493	.put_link = page_put_link,
	494	};