[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->d_name);
	inode = NULL;
	if (ino) {
		inode = nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, 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,
			   NILFS_I(child->d_inode)->i_root, 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;
d2500652 RK	72	if (ino) {
4d8d9293	73	inode = nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino);
d2500652 RK	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
4d8d9293 RK	90	inode = nilfs_iget(child->d_inode->i_sb,
4d8d9293 RK	91	NILFS_I(child->d_inode)->i_root, ino);
d2500652 RK	92	if (IS_ERR(inode))
	93	return ERR_CAST(inode);
	94	return d_obtain_alias(inode);
	95	}
	96
	97	/*
	98	* By the time this is called, we already have created
	99	* the directory cache entry for the new file, but it
	100	* is so far negative - it has no inode.
	101	*
	102	* If the create succeeds, we fill in the inode information
	103	* with d_instantiate().
	104	*/
	105	static int nilfs_create(struct inode dir, struct dentry dentry, int mode,
	106	struct nameidata *nd)
	107	{
	108	struct inode *inode;
	109	struct nilfs_transaction_info ti;
47420c79	110	int err;
d2500652 RK	111
	112	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	113	if (err)
	114	return err;
	115	inode = nilfs_new_inode(dir, mode);
	116	err = PTR_ERR(inode);
	117	if (!IS_ERR(inode)) {
	118	inode->i_op = &nilfs_file_inode_operations;
	119	inode->i_fop = &nilfs_file_operations;
	120	inode->i_mapping->a_ops = &nilfs_aops;
abdb318b	121	nilfs_mark_inode_dirty(inode);
d2500652 RK	122	err = nilfs_add_nondir(dentry, inode);
d2500652 RK	123	}
47420c79 RK	124	if (!err)
	125	err = nilfs_transaction_commit(dir->i_sb);
	126	else
	127	nilfs_transaction_abort(dir->i_sb);
	128
	129	return err;
d2500652 RK	130	}
	131
	132	static int
	133	nilfs_mknod(struct inode dir, struct dentry dentry, int mode, dev_t rdev)
	134	{
	135	struct inode *inode;
	136	struct nilfs_transaction_info ti;
47420c79	137	int err;
d2500652 RK	138
	139	if (!new_valid_dev(rdev))
	140	return -EINVAL;
	141
	142	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	143	if (err)
	144	return err;
	145	inode = nilfs_new_inode(dir, mode);
	146	err = PTR_ERR(inode);
	147	if (!IS_ERR(inode)) {
	148	init_special_inode(inode, inode->i_mode, rdev);
abdb318b	149	nilfs_mark_inode_dirty(inode);
d2500652 RK	150	err = nilfs_add_nondir(dentry, inode);
d2500652 RK	151	}
47420c79 RK	152	if (!err)
	153	err = nilfs_transaction_commit(dir->i_sb);
	154	else
	155	nilfs_transaction_abort(dir->i_sb);
	156
	157	return err;
d2500652 RK	158	}
	159
	160	static int nilfs_symlink(struct inode dir, struct dentry dentry,
	161	const char *symname)
	162	{
	163	struct nilfs_transaction_info ti;
	164	struct super_block *sb = dir->i_sb;
	165	unsigned l = strlen(symname)+1;
	166	struct inode *inode;
47420c79	167	int err;
d2500652 RK	168
	169	if (l > sb->s_blocksize)
	170	return -ENAMETOOLONG;
	171
	172	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	173	if (err)
	174	return err;
	175
	176	inode = nilfs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	177	err = PTR_ERR(inode);
	178	if (IS_ERR(inode))
	179	goto out;
	180
	181	/* slow symlink */
	182	inode->i_op = &nilfs_symlink_inode_operations;
	183	inode->i_mapping->a_ops = &nilfs_aops;
	184	err = page_symlink(inode, symname, l);
	185	if (err)
	186	goto out_fail;
	187
	188	/* mark_inode_dirty(inode); */
9ca941d4	189	/* page_symlink() do this */
d2500652 RK	190
	191	err = nilfs_add_nondir(dentry, inode);
	192	out:
47420c79 RK	193	if (!err)
	194	err = nilfs_transaction_commit(dir->i_sb);
	195	else
	196	nilfs_transaction_abort(dir->i_sb);
	197
	198	return err;
d2500652 RK	199
d2500652 RK	200	out_fail:
565de406	201	drop_nlink(inode);
abdb318b	202	nilfs_mark_inode_dirty(inode);
d2500652 RK	203	iput(inode);
	204	goto out;
	205	}
	206
	207	static int nilfs_link(struct dentry old_dentry, struct inode dir,
	208	struct dentry *dentry)
	209	{
	210	struct inode *inode = old_dentry->d_inode;
	211	struct nilfs_transaction_info ti;
47420c79	212	int err;
d2500652 RK	213
	214	if (inode->i_nlink >= NILFS_LINK_MAX)
	215	return -EMLINK;
	216
	217	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	218	if (err)
	219	return err;
	220
	221	inode->i_ctime = CURRENT_TIME;
	222	inode_inc_link_count(inode);
	223	atomic_inc(&inode->i_count);
	224
	225	err = nilfs_add_nondir(dentry, inode);
47420c79 RK	226	if (!err)
	227	err = nilfs_transaction_commit(dir->i_sb);
	228	else
	229	nilfs_transaction_abort(dir->i_sb);
	230
	231	return err;
d2500652 RK	232	}
	233
	234	static int nilfs_mkdir(struct inode dir, struct dentry dentry, int mode)
	235	{
	236	struct inode *inode;
	237	struct nilfs_transaction_info ti;
47420c79	238	int err;
d2500652 RK	239
	240	if (dir->i_nlink >= NILFS_LINK_MAX)
	241	return -EMLINK;
	242
	243	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	244	if (err)
	245	return err;
	246
565de406	247	inc_nlink(dir);
d2500652 RK	248
	249	inode = nilfs_new_inode(dir, S_IFDIR \| mode);
	250	err = PTR_ERR(inode);
	251	if (IS_ERR(inode))
	252	goto out_dir;
	253
	254	inode->i_op = &nilfs_dir_inode_operations;
	255	inode->i_fop = &nilfs_dir_operations;
	256	inode->i_mapping->a_ops = &nilfs_aops;
	257
565de406	258	inc_nlink(inode);
d2500652 RK	259
	260	err = nilfs_make_empty(inode, dir);
	261	if (err)
	262	goto out_fail;
	263
	264	err = nilfs_add_link(dentry, inode);
	265	if (err)
	266	goto out_fail;
	267
abdb318b	268	nilfs_mark_inode_dirty(inode);
d2500652 RK	269	d_instantiate(dentry, inode);
d2500652 RK	270	out:
47420c79 RK	271	if (!err)
	272	err = nilfs_transaction_commit(dir->i_sb);
	273	else
	274	nilfs_transaction_abort(dir->i_sb);
	275
	276	return err;
d2500652 RK	277
d2500652 RK	278	out_fail:
565de406	279	drop_nlink(inode);
565de406	280	drop_nlink(inode);
abdb318b	281	nilfs_mark_inode_dirty(inode);
d2500652 RK	282	iput(inode);
d2500652 RK	283	out_dir:
565de406	284	drop_nlink(dir);
abdb318b	285	nilfs_mark_inode_dirty(dir);
d2500652 RK	286	goto out;
	287	}
	288
4cd76c3c	289	static int nilfs_do_unlink(struct inode dir, struct dentry dentry)
d2500652 RK	290	{
	291	struct inode *inode;
	292	struct nilfs_dir_entry *de;
	293	struct page *page;
47420c79	294	int err;
d2500652	295
d2500652	296	err = -ENOENT;
0319003d	297	de = nilfs_find_entry(dir, &dentry->d_name, &page);
d2500652 RK	298	if (!de)
	299	goto out;
	300
	301	inode = dentry->d_inode;
	302	err = -EIO;
	303	if (le64_to_cpu(de->inode) != inode->i_ino)
	304	goto out;
	305
	306	if (!inode->i_nlink) {
	307	nilfs_warning(inode->i_sb, __func__,
	308	"deleting nonexistent file (%lu), %d\n",
	309	inode->i_ino, inode->i_nlink);
	310	inode->i_nlink = 1;
	311	}
	312	err = nilfs_delete_entry(de, page);
	313	if (err)
	314	goto out;
	315
	316	inode->i_ctime = dir->i_ctime;
565de406	317	drop_nlink(inode);
d2500652 RK	318	err = 0;
d2500652 RK	319	out:
4cd76c3c JS	320	return err;
	321	}
	322
	323	static int nilfs_unlink(struct inode dir, struct dentry dentry)
	324	{
	325	struct nilfs_transaction_info ti;
	326	int err;
	327
	328	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	329	if (err)
	330	return err;
	331
	332	err = nilfs_do_unlink(dir, dentry);
	333
	334	if (!err) {
abdb318b JS	335	nilfs_mark_inode_dirty(dir);
abdb318b JS	336	nilfs_mark_inode_dirty(dentry->d_inode);
47420c79	337	err = nilfs_transaction_commit(dir->i_sb);
4cd76c3c	338	} else
47420c79 RK	339	nilfs_transaction_abort(dir->i_sb);
	340
	341	return err;
d2500652 RK	342	}
	343
	344	static int nilfs_rmdir(struct inode dir, struct dentry dentry)
	345	{
	346	struct inode *inode = dentry->d_inode;
	347	struct nilfs_transaction_info ti;
47420c79	348	int err;
d2500652 RK	349
	350	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	351	if (err)
	352	return err;
	353
	354	err = -ENOTEMPTY;
	355	if (nilfs_empty_dir(inode)) {
4cd76c3c	356	err = nilfs_do_unlink(dir, dentry);
d2500652 RK	357	if (!err) {
d2500652 RK	358	inode->i_size = 0;
565de406	359	drop_nlink(inode);
abdb318b	360	nilfs_mark_inode_dirty(inode);
565de406	361	drop_nlink(dir);
abdb318b	362	nilfs_mark_inode_dirty(dir);
d2500652 RK	363	}
d2500652 RK	364	}
47420c79 RK	365	if (!err)
	366	err = nilfs_transaction_commit(dir->i_sb);
	367	else
	368	nilfs_transaction_abort(dir->i_sb);
	369
	370	return err;
d2500652 RK	371	}
	372
	373	static int nilfs_rename(struct inode old_dir, struct dentry old_dentry,
	374	struct inode new_dir, struct dentry new_dentry)
	375	{
	376	struct inode *old_inode = old_dentry->d_inode;
	377	struct inode *new_inode = new_dentry->d_inode;
	378	struct page *dir_page = NULL;
	379	struct nilfs_dir_entry *dir_de = NULL;
	380	struct page *old_page;
	381	struct nilfs_dir_entry *old_de;
	382	struct nilfs_transaction_info ti;
	383	int err;
	384
	385	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
	386	if (unlikely(err))
	387	return err;
	388
	389	err = -ENOENT;
0319003d	390	old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
d2500652 RK	391	if (!old_de)
	392	goto out;
	393
	394	if (S_ISDIR(old_inode->i_mode)) {
	395	err = -EIO;
	396	dir_de = nilfs_dotdot(old_inode, &dir_page);
	397	if (!dir_de)
	398	goto out_old;
	399	}
	400
	401	if (new_inode) {
	402	struct page *new_page;
	403	struct nilfs_dir_entry *new_de;
	404
	405	err = -ENOTEMPTY;
	406	if (dir_de && !nilfs_empty_dir(new_inode))
	407	goto out_dir;
	408
	409	err = -ENOENT;
0319003d	410	new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
d2500652 RK	411	if (!new_de)
d2500652 RK	412	goto out_dir;
565de406	413	inc_nlink(old_inode);
d2500652	414	nilfs_set_link(new_dir, new_de, new_page, old_inode);
abdb318b	415	nilfs_mark_inode_dirty(new_dir);
d2500652 RK	416	new_inode->i_ctime = CURRENT_TIME;
	417	if (dir_de)
	418	drop_nlink(new_inode);
565de406	419	drop_nlink(new_inode);
abdb318b	420	nilfs_mark_inode_dirty(new_inode);
d2500652 RK	421	} else {
	422	if (dir_de) {
	423	err = -EMLINK;
	424	if (new_dir->i_nlink >= NILFS_LINK_MAX)
	425	goto out_dir;
	426	}
565de406	427	inc_nlink(old_inode);
d2500652 RK	428	err = nilfs_add_link(new_dentry, old_inode);
d2500652 RK	429	if (err) {
565de406	430	drop_nlink(old_inode);
abdb318b	431	nilfs_mark_inode_dirty(old_inode);
d2500652 RK	432	goto out_dir;
d2500652 RK	433	}
565de406 JS	434	if (dir_de) {
565de406 JS	435	inc_nlink(new_dir);
abdb318b	436	nilfs_mark_inode_dirty(new_dir);
565de406	437	}
d2500652 RK	438	}
	439
	440	/*
	441	* Like most other Unix systems, set the ctime for inodes on a
	442	* rename.
d2500652 RK	443	*/
	444	old_inode->i_ctime = CURRENT_TIME;
	445
	446	nilfs_delete_entry(old_de, old_page);
43f8bc26	447	drop_nlink(old_inode);
d2500652 RK	448
	449	if (dir_de) {
	450	nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
565de406	451	drop_nlink(old_dir);
d2500652	452	}
abdb318b JS	453	nilfs_mark_inode_dirty(old_dir);
abdb318b JS	454	nilfs_mark_inode_dirty(old_inode);
d2500652	455
47420c79	456	err = nilfs_transaction_commit(old_dir->i_sb);
d2500652 RK	457	return err;
	458
	459	out_dir:
	460	if (dir_de) {
	461	kunmap(dir_page);
	462	page_cache_release(dir_page);
	463	}
	464	out_old:
	465	kunmap(old_page);
	466	page_cache_release(old_page);
	467	out:
47420c79	468	nilfs_transaction_abort(old_dir->i_sb);
d2500652 RK	469	return err;
	470	}
	471
6e1d5dcc	472	const struct inode_operations nilfs_dir_inode_operations = {
d2500652 RK	473	.create = nilfs_create,
	474	.lookup = nilfs_lookup,
	475	.link = nilfs_link,
	476	.unlink = nilfs_unlink,
	477	.symlink = nilfs_symlink,
	478	.mkdir = nilfs_mkdir,
	479	.rmdir = nilfs_rmdir,
	480	.mknod = nilfs_mknod,
	481	.rename = nilfs_rename,
	482	.setattr = nilfs_setattr,
	483	.permission = nilfs_permission,
	484	};
	485
6e1d5dcc	486	const struct inode_operations nilfs_special_inode_operations = {
d2500652 RK	487	.setattr = nilfs_setattr,
	488	.permission = nilfs_permission,
	489	};
	490
6e1d5dcc	491	const struct inode_operations nilfs_symlink_inode_operations = {
d2500652 RK	492	.readlink = generic_readlink,
	493	.follow_link = page_follow_link_light,
	494	.put_link = page_put_link,
	495	};