[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"
#include "export.h"

#define NILFS_FID_SIZE_NON_CONNECTABLE \
	(offsetof(struct nilfs_fid, parent_gen) / 4)
#define NILFS_FID_SIZE_CONNECTABLE	(sizeof(struct nilfs_fid) / 4)

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);
		unlock_new_inode(inode);
		return 0;
	}
	inode_dec_link_count(inode);
	unlock_new_inode(inode);
	iput(inode);
	return err;
}

/*
 * Methods themselves.
 */

static struct dentry *
nilfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
{
	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 = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
	return d_splice_alias(inode, dentry);
}

/*
 * 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, umode_t mode,
			bool excl)
{
	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, umode_t mode, dev_t rdev)
{
	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)) {
		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);
	unlock_new_inode(inode);
	iput(inode);
	goto out;
}

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

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

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

	err = nilfs_add_link(dentry, inode);
	if (!err) {
		d_instantiate(dentry, inode);
		err = nilfs_transaction_commit(dir->i_sb);
	} else {
		inode_dec_link_count(inode);
		iput(inode);
		nilfs_transaction_abort(dir->i_sb);
	}

	return err;
}

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

	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);
	unlock_new_inode(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);
	unlock_new_inode(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 = d_inode(dentry);
	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);
		set_nlink(inode, 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(d_inode(dentry));
		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 = d_inode(dentry);
	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 = d_inode(old_dentry);
	struct inode *new_inode = d_inode(new_dentry);
	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;
		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 {
		err = nilfs_add_link(new_dentry, old_inode);
		if (err)
			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);

	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;
}

/*
 * Export operations
 */
static struct dentry *nilfs_get_parent(struct dentry *child)
{
	unsigned long ino;
	struct inode *inode;
	struct qstr dotdot = QSTR_INIT("..", 2);
	struct nilfs_root *root;

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

	root = NILFS_I(d_inode(child))->i_root;

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

	return d_obtain_alias(inode);
}

static struct dentry *nilfs_get_dentry(struct super_block *sb, u64 cno,
				       u64 ino, u32 gen)
{
	struct nilfs_root *root;
	struct inode *inode;

	if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
		return ERR_PTR(-ESTALE);

	root = nilfs_lookup_root(sb->s_fs_info, cno);
	if (!root)
		return ERR_PTR(-ESTALE);

	inode = nilfs_iget(sb, root, ino);
	nilfs_put_root(root);

	if (IS_ERR(inode))
		return ERR_CAST(inode);
	if (gen && inode->i_generation != gen) {
		iput(inode);
		return ERR_PTR(-ESTALE);
	}
	return d_obtain_alias(inode);
}

static struct dentry *nilfs_fh_to_dentry(struct super_block *sb, struct fid *fh,
					 int fh_len, int fh_type)
{
	struct nilfs_fid *fid = (struct nilfs_fid *)fh;

	if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE ||
	    (fh_type != FILEID_NILFS_WITH_PARENT &&
	     fh_type != FILEID_NILFS_WITHOUT_PARENT))
		return NULL;

	return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
}

static struct dentry *nilfs_fh_to_parent(struct super_block *sb, struct fid *fh,
					 int fh_len, int fh_type)
{
	struct nilfs_fid *fid = (struct nilfs_fid *)fh;

	if (fh_len < NILFS_FID_SIZE_CONNECTABLE ||
	    fh_type != FILEID_NILFS_WITH_PARENT)
		return NULL;

	return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
}

static int nilfs_encode_fh(struct inode *inode, __u32 *fh, int *lenp,
			   struct inode *parent)
{
	struct nilfs_fid *fid = (struct nilfs_fid *)fh;
	struct nilfs_root *root = NILFS_I(inode)->i_root;
	int type;

	if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
		*lenp = NILFS_FID_SIZE_CONNECTABLE;
		return FILEID_INVALID;
	}
	if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
		*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
		return FILEID_INVALID;
	}

	fid->cno = root->cno;
	fid->ino = inode->i_ino;
	fid->gen = inode->i_generation;

	if (parent) {
		fid->parent_ino = parent->i_ino;
		fid->parent_gen = parent->i_generation;
		type = FILEID_NILFS_WITH_PARENT;
		*lenp = NILFS_FID_SIZE_CONNECTABLE;
	} else {
		type = FILEID_NILFS_WITHOUT_PARENT;
		*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
	}

	return type;
}

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,
	.fiemap		= nilfs_fiemap,
};

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,
	.permission     = nilfs_permission,
};

const struct export_operations nilfs_export_ops = {
	.encode_fh = nilfs_encode_fh,
	.fh_to_dentry = nilfs_fh_to_dentry,
	.fh_to_parent = nilfs_fh_to_parent,
	.get_parent = nilfs_get_parent,
};
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"
8e656fd5	43	#include "export.h"
d2500652	44
8e656fd5 RK	45	#define NILFS_FID_SIZE_NON_CONNECTABLE \
	46	(offsetof(struct nilfs_fid, parent_gen) / 4)
	47	#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
d2500652 RK	48
	49	static inline int nilfs_add_nondir(struct dentry dentry, struct inode inode)
	50	{
	51	int err = nilfs_add_link(dentry, inode);
	52	if (!err) {
	53	d_instantiate(dentry, inode);
705304a8	54	unlock_new_inode(inode);
d2500652 RK	55	return 0;
	56	}
	57	inode_dec_link_count(inode);
705304a8	58	unlock_new_inode(inode);
d2500652 RK	59	iput(inode);
	60	return err;
	61	}
	62
	63	/*
	64	* Methods themselves.
	65	*/
	66
	67	static struct dentry *
00cd8dd3	68	nilfs_lookup(struct inode dir, struct dentry dentry, unsigned int flags)
d2500652 RK	69	{
	70	struct inode *inode;
	71	ino_t ino;
	72
	73	if (dentry->d_name.len > NILFS_NAME_LEN)
	74	return ERR_PTR(-ENAMETOOLONG);
	75
0319003d	76	ino = nilfs_inode_by_name(dir, &dentry->d_name);
a9049376	77	inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
d2500652 RK	78	return d_splice_alias(inode, dentry);
	79	}
	80
d2500652 RK	81	/*
	82	* By the time this is called, we already have created
	83	* the directory cache entry for the new file, but it
	84	* is so far negative - it has no inode.
	85	*
	86	* If the create succeeds, we fill in the inode information
	87	* with d_instantiate().
	88	*/
4acdaf27	89	static int nilfs_create(struct inode dir, struct dentry dentry, umode_t mode,
ebfc3b49	90	bool excl)
d2500652 RK	91	{
	92	struct inode *inode;
	93	struct nilfs_transaction_info ti;
47420c79	94	int err;
d2500652 RK	95
	96	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	97	if (err)
	98	return err;
	99	inode = nilfs_new_inode(dir, mode);
	100	err = PTR_ERR(inode);
	101	if (!IS_ERR(inode)) {
	102	inode->i_op = &nilfs_file_inode_operations;
	103	inode->i_fop = &nilfs_file_operations;
	104	inode->i_mapping->a_ops = &nilfs_aops;
abdb318b	105	nilfs_mark_inode_dirty(inode);
d2500652 RK	106	err = nilfs_add_nondir(dentry, inode);
d2500652 RK	107	}
47420c79 RK	108	if (!err)
	109	err = nilfs_transaction_commit(dir->i_sb);
	110	else
	111	nilfs_transaction_abort(dir->i_sb);
	112
	113	return err;
d2500652 RK	114	}
	115
	116	static int
1a67aafb	117	nilfs_mknod(struct inode dir, struct dentry dentry, umode_t mode, dev_t rdev)
d2500652 RK	118	{
	119	struct inode *inode;
	120	struct nilfs_transaction_info ti;
47420c79	121	int err;
d2500652	122
d2500652 RK	123	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	124	if (err)
	125	return err;
	126	inode = nilfs_new_inode(dir, mode);
	127	err = PTR_ERR(inode);
	128	if (!IS_ERR(inode)) {
	129	init_special_inode(inode, inode->i_mode, rdev);
abdb318b	130	nilfs_mark_inode_dirty(inode);
d2500652 RK	131	err = nilfs_add_nondir(dentry, inode);
d2500652 RK	132	}
47420c79 RK	133	if (!err)
	134	err = nilfs_transaction_commit(dir->i_sb);
	135	else
	136	nilfs_transaction_abort(dir->i_sb);
	137
	138	return err;
d2500652 RK	139	}
	140
	141	static int nilfs_symlink(struct inode dir, struct dentry dentry,
	142	const char *symname)
	143	{
	144	struct nilfs_transaction_info ti;
	145	struct super_block *sb = dir->i_sb;
	146	unsigned l = strlen(symname)+1;
	147	struct inode *inode;
47420c79	148	int err;
d2500652 RK	149
	150	if (l > sb->s_blocksize)
	151	return -ENAMETOOLONG;
	152
	153	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	154	if (err)
	155	return err;
	156
	157	inode = nilfs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	158	err = PTR_ERR(inode);
	159	if (IS_ERR(inode))
	160	goto out;
	161
	162	/* slow symlink */
	163	inode->i_op = &nilfs_symlink_inode_operations;
	164	inode->i_mapping->a_ops = &nilfs_aops;
	165	err = page_symlink(inode, symname, l);
	166	if (err)
	167	goto out_fail;
	168
	169	/* mark_inode_dirty(inode); */
9ca941d4	170	/* page_symlink() do this */
d2500652 RK	171
	172	err = nilfs_add_nondir(dentry, inode);
	173	out:
47420c79 RK	174	if (!err)
	175	err = nilfs_transaction_commit(dir->i_sb);
	176	else
	177	nilfs_transaction_abort(dir->i_sb);
	178
	179	return err;
d2500652 RK	180
d2500652 RK	181	out_fail:
565de406	182	drop_nlink(inode);
abdb318b	183	nilfs_mark_inode_dirty(inode);
705304a8	184	unlock_new_inode(inode);
d2500652 RK	185	iput(inode);
	186	goto out;
	187	}
	188
	189	static int nilfs_link(struct dentry old_dentry, struct inode dir,
	190	struct dentry *dentry)
	191	{
2b0143b5	192	struct inode *inode = d_inode(old_dentry);
d2500652	193	struct nilfs_transaction_info ti;
47420c79	194	int err;
d2500652	195
d2500652 RK	196	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	197	if (err)
	198	return err;
	199
	200	inode->i_ctime = CURRENT_TIME;
	201	inode_inc_link_count(inode);
7de9c6ee	202	ihold(inode);
d2500652	203
705304a8 RK	204	err = nilfs_add_link(dentry, inode);
	205	if (!err) {
	206	d_instantiate(dentry, inode);
47420c79	207	err = nilfs_transaction_commit(dir->i_sb);
705304a8 RK	208	} else {
	209	inode_dec_link_count(inode);
	210	iput(inode);
47420c79	211	nilfs_transaction_abort(dir->i_sb);
705304a8	212	}
47420c79 RK	213
47420c79 RK	214	return err;
d2500652 RK	215	}
d2500652 RK	216
18bb1db3	217	static int nilfs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
d2500652 RK	218	{
	219	struct inode *inode;
	220	struct nilfs_transaction_info ti;
47420c79	221	int err;
d2500652	222
d2500652 RK	223	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	224	if (err)
	225	return err;
	226
565de406	227	inc_nlink(dir);
d2500652 RK	228
	229	inode = nilfs_new_inode(dir, S_IFDIR \| mode);
	230	err = PTR_ERR(inode);
	231	if (IS_ERR(inode))
	232	goto out_dir;
	233
	234	inode->i_op = &nilfs_dir_inode_operations;
	235	inode->i_fop = &nilfs_dir_operations;
	236	inode->i_mapping->a_ops = &nilfs_aops;
	237
565de406	238	inc_nlink(inode);
d2500652 RK	239
	240	err = nilfs_make_empty(inode, dir);
	241	if (err)
	242	goto out_fail;
	243
	244	err = nilfs_add_link(dentry, inode);
	245	if (err)
	246	goto out_fail;
	247
abdb318b	248	nilfs_mark_inode_dirty(inode);
d2500652	249	d_instantiate(dentry, inode);
705304a8	250	unlock_new_inode(inode);
d2500652	251	out:
47420c79 RK	252	if (!err)
	253	err = nilfs_transaction_commit(dir->i_sb);
	254	else
	255	nilfs_transaction_abort(dir->i_sb);
	256
	257	return err;
d2500652 RK	258
d2500652 RK	259	out_fail:
565de406	260	drop_nlink(inode);
565de406	261	drop_nlink(inode);
abdb318b	262	nilfs_mark_inode_dirty(inode);
705304a8	263	unlock_new_inode(inode);
d2500652 RK	264	iput(inode);
d2500652 RK	265	out_dir:
565de406	266	drop_nlink(dir);
abdb318b	267	nilfs_mark_inode_dirty(dir);
d2500652 RK	268	goto out;
	269	}
	270
4cd76c3c	271	static int nilfs_do_unlink(struct inode dir, struct dentry dentry)
d2500652 RK	272	{
	273	struct inode *inode;
	274	struct nilfs_dir_entry *de;
	275	struct page *page;
47420c79	276	int err;
d2500652	277
d2500652	278	err = -ENOENT;
0319003d	279	de = nilfs_find_entry(dir, &dentry->d_name, &page);
d2500652 RK	280	if (!de)
	281	goto out;
	282
2b0143b5	283	inode = d_inode(dentry);
d2500652 RK	284	err = -EIO;
	285	if (le64_to_cpu(de->inode) != inode->i_ino)
	286	goto out;
	287
	288	if (!inode->i_nlink) {
	289	nilfs_warning(inode->i_sb, __func__,
	290	"deleting nonexistent file (%lu), %d\n",
	291	inode->i_ino, inode->i_nlink);
bfe86848	292	set_nlink(inode, 1);
d2500652 RK	293	}
	294	err = nilfs_delete_entry(de, page);
	295	if (err)
	296	goto out;
	297
	298	inode->i_ctime = dir->i_ctime;
565de406	299	drop_nlink(inode);
d2500652 RK	300	err = 0;
d2500652 RK	301	out:
4cd76c3c JS	302	return err;
	303	}
	304
	305	static int nilfs_unlink(struct inode dir, struct dentry dentry)
	306	{
	307	struct nilfs_transaction_info ti;
	308	int err;
	309
	310	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	311	if (err)
	312	return err;
	313
	314	err = nilfs_do_unlink(dir, dentry);
	315
	316	if (!err) {
abdb318b	317	nilfs_mark_inode_dirty(dir);
2b0143b5	318	nilfs_mark_inode_dirty(d_inode(dentry));
47420c79	319	err = nilfs_transaction_commit(dir->i_sb);
4cd76c3c	320	} else
47420c79 RK	321	nilfs_transaction_abort(dir->i_sb);
	322
	323	return err;
d2500652 RK	324	}
	325
	326	static int nilfs_rmdir(struct inode dir, struct dentry dentry)
	327	{
2b0143b5	328	struct inode *inode = d_inode(dentry);
d2500652	329	struct nilfs_transaction_info ti;
47420c79	330	int err;
d2500652 RK	331
	332	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	333	if (err)
	334	return err;
	335
	336	err = -ENOTEMPTY;
	337	if (nilfs_empty_dir(inode)) {
4cd76c3c	338	err = nilfs_do_unlink(dir, dentry);
d2500652 RK	339	if (!err) {
d2500652 RK	340	inode->i_size = 0;
565de406	341	drop_nlink(inode);
abdb318b	342	nilfs_mark_inode_dirty(inode);
565de406	343	drop_nlink(dir);
abdb318b	344	nilfs_mark_inode_dirty(dir);
d2500652 RK	345	}
d2500652 RK	346	}
47420c79 RK	347	if (!err)
	348	err = nilfs_transaction_commit(dir->i_sb);
	349	else
	350	nilfs_transaction_abort(dir->i_sb);
	351
	352	return err;
d2500652 RK	353	}
	354
	355	static int nilfs_rename(struct inode old_dir, struct dentry old_dentry,
	356	struct inode new_dir, struct dentry new_dentry)
	357	{
2b0143b5 DH	358	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	359	struct inode *new_inode = d_inode(new_dentry);
d2500652 RK	360	struct page *dir_page = NULL;
	361	struct nilfs_dir_entry *dir_de = NULL;
	362	struct page *old_page;
	363	struct nilfs_dir_entry *old_de;
	364	struct nilfs_transaction_info ti;
	365	int err;
	366
	367	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
	368	if (unlikely(err))
	369	return err;
	370
	371	err = -ENOENT;
0319003d	372	old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
d2500652 RK	373	if (!old_de)
	374	goto out;
	375
	376	if (S_ISDIR(old_inode->i_mode)) {
	377	err = -EIO;
	378	dir_de = nilfs_dotdot(old_inode, &dir_page);
	379	if (!dir_de)
	380	goto out_old;
	381	}
	382
	383	if (new_inode) {
	384	struct page *new_page;
	385	struct nilfs_dir_entry *new_de;
	386
	387	err = -ENOTEMPTY;
	388	if (dir_de && !nilfs_empty_dir(new_inode))
	389	goto out_dir;
	390
	391	err = -ENOENT;
0319003d	392	new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
d2500652 RK	393	if (!new_de)
d2500652 RK	394	goto out_dir;
d2500652	395	nilfs_set_link(new_dir, new_de, new_page, old_inode);
abdb318b	396	nilfs_mark_inode_dirty(new_dir);
d2500652 RK	397	new_inode->i_ctime = CURRENT_TIME;
	398	if (dir_de)
	399	drop_nlink(new_inode);
565de406	400	drop_nlink(new_inode);
abdb318b	401	nilfs_mark_inode_dirty(new_inode);
d2500652	402	} else {
d2500652	403	err = nilfs_add_link(new_dentry, old_inode);
30eb43d3	404	if (err)
d2500652	405	goto out_dir;
565de406 JS	406	if (dir_de) {
565de406 JS	407	inc_nlink(new_dir);
abdb318b	408	nilfs_mark_inode_dirty(new_dir);
565de406	409	}
d2500652 RK	410	}
	411
	412	/*
	413	* Like most other Unix systems, set the ctime for inodes on a
	414	* rename.
d2500652 RK	415	*/
	416	old_inode->i_ctime = CURRENT_TIME;
	417
	418	nilfs_delete_entry(old_de, old_page);
d2500652 RK	419
	420	if (dir_de) {
	421	nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
565de406	422	drop_nlink(old_dir);
d2500652	423	}
abdb318b JS	424	nilfs_mark_inode_dirty(old_dir);
abdb318b JS	425	nilfs_mark_inode_dirty(old_inode);
d2500652	426
47420c79	427	err = nilfs_transaction_commit(old_dir->i_sb);
d2500652 RK	428	return err;
	429
	430	out_dir:
	431	if (dir_de) {
	432	kunmap(dir_page);
	433	page_cache_release(dir_page);
	434	}
	435	out_old:
	436	kunmap(old_page);
	437	page_cache_release(old_page);
	438	out:
47420c79	439	nilfs_transaction_abort(old_dir->i_sb);
d2500652 RK	440	return err;
	441	}
	442
8e656fd5 RK	443	/*
	444	* Export operations
	445	*/
	446	static struct dentry nilfs_get_parent(struct dentry child)
	447	{
	448	unsigned long ino;
	449	struct inode *inode;
26fe5750	450	struct qstr dotdot = QSTR_INIT("..", 2);
8e656fd5 RK	451	struct nilfs_root *root;
8e656fd5 RK	452
2b0143b5	453	ino = nilfs_inode_by_name(d_inode(child), &dotdot);
8e656fd5 RK	454	if (!ino)
	455	return ERR_PTR(-ENOENT);
	456
2b0143b5	457	root = NILFS_I(d_inode(child))->i_root;
8e656fd5	458
2b0143b5	459	inode = nilfs_iget(d_inode(child)->i_sb, root, ino);
8e656fd5 RK	460	if (IS_ERR(inode))
	461	return ERR_CAST(inode);
	462
	463	return d_obtain_alias(inode);
	464	}
	465
	466	static struct dentry nilfs_get_dentry(struct super_block sb, u64 cno,
	467	u64 ino, u32 gen)
	468	{
	469	struct nilfs_root *root;
	470	struct inode *inode;
	471
	472	if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
	473	return ERR_PTR(-ESTALE);
	474
e3154e97	475	root = nilfs_lookup_root(sb->s_fs_info, cno);
8e656fd5 RK	476	if (!root)
	477	return ERR_PTR(-ESTALE);
	478
	479	inode = nilfs_iget(sb, root, ino);
	480	nilfs_put_root(root);
	481
	482	if (IS_ERR(inode))
	483	return ERR_CAST(inode);
	484	if (gen && inode->i_generation != gen) {
	485	iput(inode);
	486	return ERR_PTR(-ESTALE);
	487	}
	488	return d_obtain_alias(inode);
	489	}
	490
	491	static struct dentry nilfs_fh_to_dentry(struct super_block sb, struct fid *fh,
	492	int fh_len, int fh_type)
	493	{
	494	struct nilfs_fid fid = (struct nilfs_fid )fh;
	495
f73c2f1f	496	if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE \|\|
8e656fd5 RK	497	(fh_type != FILEID_NILFS_WITH_PARENT &&
	498	fh_type != FILEID_NILFS_WITHOUT_PARENT))
	499	return NULL;
	500
	501	return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
	502	}
	503
	504	static struct dentry nilfs_fh_to_parent(struct super_block sb, struct fid *fh,
	505	int fh_len, int fh_type)
	506	{
	507	struct nilfs_fid fid = (struct nilfs_fid )fh;
	508
f73c2f1f	509	if (fh_len < NILFS_FID_SIZE_CONNECTABLE \|\|
8e656fd5 RK	510	fh_type != FILEID_NILFS_WITH_PARENT)
	511	return NULL;
	512
	513	return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
	514	}
	515
b0b0382b AV	516	static int nilfs_encode_fh(struct inode inode, __u32 fh, int *lenp,
b0b0382b AV	517	struct inode *parent)
8e656fd5 RK	518	{
8e656fd5 RK	519	struct nilfs_fid fid = (struct nilfs_fid )fh;
8e656fd5 RK	520	struct nilfs_root *root = NILFS_I(inode)->i_root;
	521	int type;
	522
b0b0382b AV	523	if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
b0b0382b AV	524	*lenp = NILFS_FID_SIZE_CONNECTABLE;
94e07a75	525	return FILEID_INVALID;
b0b0382b AV	526	}
	527	if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
	528	*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
94e07a75	529	return FILEID_INVALID;
b0b0382b	530	}
8e656fd5 RK	531
	532	fid->cno = root->cno;
	533	fid->ino = inode->i_ino;
	534	fid->gen = inode->i_generation;
	535
b0b0382b	536	if (parent) {
8e656fd5 RK	537	fid->parent_ino = parent->i_ino;
8e656fd5 RK	538	fid->parent_gen = parent->i_generation;
8e656fd5 RK	539	type = FILEID_NILFS_WITH_PARENT;
	540	*lenp = NILFS_FID_SIZE_CONNECTABLE;
	541	} else {
	542	type = FILEID_NILFS_WITHOUT_PARENT;
	543	*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
	544	}
	545
	546	return type;
	547	}
	548
6e1d5dcc	549	const struct inode_operations nilfs_dir_inode_operations = {
d2500652 RK	550	.create = nilfs_create,
	551	.lookup = nilfs_lookup,
	552	.link = nilfs_link,
	553	.unlink = nilfs_unlink,
	554	.symlink = nilfs_symlink,
	555	.mkdir = nilfs_mkdir,
	556	.rmdir = nilfs_rmdir,
	557	.mknod = nilfs_mknod,
	558	.rename = nilfs_rename,
	559	.setattr = nilfs_setattr,
	560	.permission = nilfs_permission,
622daaff	561	.fiemap = nilfs_fiemap,
d2500652 RK	562	};
d2500652 RK	563
6e1d5dcc	564	const struct inode_operations nilfs_special_inode_operations = {
d2500652 RK	565	.setattr = nilfs_setattr,
	566	.permission = nilfs_permission,
	567	};
	568
6e1d5dcc	569	const struct inode_operations nilfs_symlink_inode_operations = {
d2500652 RK	570	.readlink = generic_readlink,
	571	.follow_link = page_follow_link_light,
	572	.put_link = page_put_link,
dc3d3b81	573	.permission = nilfs_permission,
d2500652	574	};
8e656fd5 RK	575
	576	const struct export_operations nilfs_export_ops = {
	577	.encode_fh = nilfs_encode_fh,
	578	.fh_to_dentry = nilfs_fh_to_dentry,
	579	.fh_to_parent = nilfs_fh_to_parent,
	580	.get_parent = nilfs_get_parent,
	581	};