[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_nohighmem(inode);
	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);
		put_page(dir_page);
	}
out_old:
	kunmap(old_page);
	put_page(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,
	.get_link	= page_get_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;
21fc61c7	164	inode_nohighmem(inode);
d2500652 RK	165	inode->i_mapping->a_ops = &nilfs_aops;
	166	err = page_symlink(inode, symname, l);
	167	if (err)
	168	goto out_fail;
	169
	170	/* mark_inode_dirty(inode); */
9ca941d4	171	/* page_symlink() do this */
d2500652 RK	172
	173	err = nilfs_add_nondir(dentry, inode);
	174	out:
47420c79 RK	175	if (!err)
	176	err = nilfs_transaction_commit(dir->i_sb);
	177	else
	178	nilfs_transaction_abort(dir->i_sb);
	179
	180	return err;
d2500652 RK	181
d2500652 RK	182	out_fail:
565de406	183	drop_nlink(inode);
abdb318b	184	nilfs_mark_inode_dirty(inode);
705304a8	185	unlock_new_inode(inode);
d2500652 RK	186	iput(inode);
	187	goto out;
	188	}
	189
	190	static int nilfs_link(struct dentry old_dentry, struct inode dir,
	191	struct dentry *dentry)
	192	{
2b0143b5	193	struct inode *inode = d_inode(old_dentry);
d2500652	194	struct nilfs_transaction_info ti;
47420c79	195	int err;
d2500652	196
d2500652 RK	197	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	198	if (err)
	199	return err;
	200
	201	inode->i_ctime = CURRENT_TIME;
	202	inode_inc_link_count(inode);
7de9c6ee	203	ihold(inode);
d2500652	204
705304a8 RK	205	err = nilfs_add_link(dentry, inode);
	206	if (!err) {
	207	d_instantiate(dentry, inode);
47420c79	208	err = nilfs_transaction_commit(dir->i_sb);
705304a8 RK	209	} else {
	210	inode_dec_link_count(inode);
	211	iput(inode);
47420c79	212	nilfs_transaction_abort(dir->i_sb);
705304a8	213	}
47420c79 RK	214
47420c79 RK	215	return err;
d2500652 RK	216	}
d2500652 RK	217
18bb1db3	218	static int nilfs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
d2500652 RK	219	{
	220	struct inode *inode;
	221	struct nilfs_transaction_info ti;
47420c79	222	int err;
d2500652	223
d2500652 RK	224	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	225	if (err)
	226	return err;
	227
565de406	228	inc_nlink(dir);
d2500652 RK	229
	230	inode = nilfs_new_inode(dir, S_IFDIR \| mode);
	231	err = PTR_ERR(inode);
	232	if (IS_ERR(inode))
	233	goto out_dir;
	234
	235	inode->i_op = &nilfs_dir_inode_operations;
	236	inode->i_fop = &nilfs_dir_operations;
	237	inode->i_mapping->a_ops = &nilfs_aops;
	238
565de406	239	inc_nlink(inode);
d2500652 RK	240
	241	err = nilfs_make_empty(inode, dir);
	242	if (err)
	243	goto out_fail;
	244
	245	err = nilfs_add_link(dentry, inode);
	246	if (err)
	247	goto out_fail;
	248
abdb318b	249	nilfs_mark_inode_dirty(inode);
d2500652	250	d_instantiate(dentry, inode);
705304a8	251	unlock_new_inode(inode);
d2500652	252	out:
47420c79 RK	253	if (!err)
	254	err = nilfs_transaction_commit(dir->i_sb);
	255	else
	256	nilfs_transaction_abort(dir->i_sb);
	257
	258	return err;
d2500652 RK	259
d2500652 RK	260	out_fail:
565de406	261	drop_nlink(inode);
565de406	262	drop_nlink(inode);
abdb318b	263	nilfs_mark_inode_dirty(inode);
705304a8	264	unlock_new_inode(inode);
d2500652 RK	265	iput(inode);
d2500652 RK	266	out_dir:
565de406	267	drop_nlink(dir);
abdb318b	268	nilfs_mark_inode_dirty(dir);
d2500652 RK	269	goto out;
	270	}
	271
4cd76c3c	272	static int nilfs_do_unlink(struct inode dir, struct dentry dentry)
d2500652 RK	273	{
	274	struct inode *inode;
	275	struct nilfs_dir_entry *de;
	276	struct page *page;
47420c79	277	int err;
d2500652	278
d2500652	279	err = -ENOENT;
0319003d	280	de = nilfs_find_entry(dir, &dentry->d_name, &page);
d2500652 RK	281	if (!de)
	282	goto out;
	283
2b0143b5	284	inode = d_inode(dentry);
d2500652 RK	285	err = -EIO;
	286	if (le64_to_cpu(de->inode) != inode->i_ino)
	287	goto out;
	288
	289	if (!inode->i_nlink) {
	290	nilfs_warning(inode->i_sb, __func__,
	291	"deleting nonexistent file (%lu), %d\n",
	292	inode->i_ino, inode->i_nlink);
bfe86848	293	set_nlink(inode, 1);
d2500652 RK	294	}
	295	err = nilfs_delete_entry(de, page);
	296	if (err)
	297	goto out;
	298
	299	inode->i_ctime = dir->i_ctime;
565de406	300	drop_nlink(inode);
d2500652 RK	301	err = 0;
d2500652 RK	302	out:
4cd76c3c JS	303	return err;
	304	}
	305
	306	static int nilfs_unlink(struct inode dir, struct dentry dentry)
	307	{
	308	struct nilfs_transaction_info ti;
	309	int err;
	310
	311	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	312	if (err)
	313	return err;
	314
	315	err = nilfs_do_unlink(dir, dentry);
	316
	317	if (!err) {
abdb318b	318	nilfs_mark_inode_dirty(dir);
2b0143b5	319	nilfs_mark_inode_dirty(d_inode(dentry));
47420c79	320	err = nilfs_transaction_commit(dir->i_sb);
4cd76c3c	321	} else
47420c79 RK	322	nilfs_transaction_abort(dir->i_sb);
	323
	324	return err;
d2500652 RK	325	}
	326
	327	static int nilfs_rmdir(struct inode dir, struct dentry dentry)
	328	{
2b0143b5	329	struct inode *inode = d_inode(dentry);
d2500652	330	struct nilfs_transaction_info ti;
47420c79	331	int err;
d2500652 RK	332
	333	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	334	if (err)
	335	return err;
	336
	337	err = -ENOTEMPTY;
	338	if (nilfs_empty_dir(inode)) {
4cd76c3c	339	err = nilfs_do_unlink(dir, dentry);
d2500652 RK	340	if (!err) {
d2500652 RK	341	inode->i_size = 0;
565de406	342	drop_nlink(inode);
abdb318b	343	nilfs_mark_inode_dirty(inode);
565de406	344	drop_nlink(dir);
abdb318b	345	nilfs_mark_inode_dirty(dir);
d2500652 RK	346	}
d2500652 RK	347	}
47420c79 RK	348	if (!err)
	349	err = nilfs_transaction_commit(dir->i_sb);
	350	else
	351	nilfs_transaction_abort(dir->i_sb);
	352
	353	return err;
d2500652 RK	354	}
	355
	356	static int nilfs_rename(struct inode old_dir, struct dentry old_dentry,
	357	struct inode new_dir, struct dentry new_dentry)
	358	{
2b0143b5 DH	359	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	360	struct inode *new_inode = d_inode(new_dentry);
d2500652 RK	361	struct page *dir_page = NULL;
	362	struct nilfs_dir_entry *dir_de = NULL;
	363	struct page *old_page;
	364	struct nilfs_dir_entry *old_de;
	365	struct nilfs_transaction_info ti;
	366	int err;
	367
	368	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
	369	if (unlikely(err))
	370	return err;
	371
	372	err = -ENOENT;
0319003d	373	old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
d2500652 RK	374	if (!old_de)
	375	goto out;
	376
	377	if (S_ISDIR(old_inode->i_mode)) {
	378	err = -EIO;
	379	dir_de = nilfs_dotdot(old_inode, &dir_page);
	380	if (!dir_de)
	381	goto out_old;
	382	}
	383
	384	if (new_inode) {
	385	struct page *new_page;
	386	struct nilfs_dir_entry *new_de;
	387
	388	err = -ENOTEMPTY;
	389	if (dir_de && !nilfs_empty_dir(new_inode))
	390	goto out_dir;
	391
	392	err = -ENOENT;
0319003d	393	new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
d2500652 RK	394	if (!new_de)
d2500652 RK	395	goto out_dir;
d2500652	396	nilfs_set_link(new_dir, new_de, new_page, old_inode);
abdb318b	397	nilfs_mark_inode_dirty(new_dir);
d2500652 RK	398	new_inode->i_ctime = CURRENT_TIME;
	399	if (dir_de)
	400	drop_nlink(new_inode);
565de406	401	drop_nlink(new_inode);
abdb318b	402	nilfs_mark_inode_dirty(new_inode);
d2500652	403	} else {
d2500652	404	err = nilfs_add_link(new_dentry, old_inode);
30eb43d3	405	if (err)
d2500652	406	goto out_dir;
565de406 JS	407	if (dir_de) {
565de406 JS	408	inc_nlink(new_dir);
abdb318b	409	nilfs_mark_inode_dirty(new_dir);
565de406	410	}
d2500652 RK	411	}
	412
	413	/*
	414	* Like most other Unix systems, set the ctime for inodes on a
	415	* rename.
d2500652 RK	416	*/
	417	old_inode->i_ctime = CURRENT_TIME;
	418
	419	nilfs_delete_entry(old_de, old_page);
d2500652 RK	420
	421	if (dir_de) {
	422	nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
565de406	423	drop_nlink(old_dir);
d2500652	424	}
abdb318b JS	425	nilfs_mark_inode_dirty(old_dir);
abdb318b JS	426	nilfs_mark_inode_dirty(old_inode);
d2500652	427
47420c79	428	err = nilfs_transaction_commit(old_dir->i_sb);
d2500652 RK	429	return err;
	430
	431	out_dir:
	432	if (dir_de) {
	433	kunmap(dir_page);
09cbfeaf	434	put_page(dir_page);
d2500652 RK	435	}
	436	out_old:
	437	kunmap(old_page);
09cbfeaf	438	put_page(old_page);
d2500652	439	out:
47420c79	440	nilfs_transaction_abort(old_dir->i_sb);
d2500652 RK	441	return err;
	442	}
	443
8e656fd5 RK	444	/*
	445	* Export operations
	446	*/
	447	static struct dentry nilfs_get_parent(struct dentry child)
	448	{
	449	unsigned long ino;
	450	struct inode *inode;
26fe5750	451	struct qstr dotdot = QSTR_INIT("..", 2);
8e656fd5 RK	452	struct nilfs_root *root;
8e656fd5 RK	453
2b0143b5	454	ino = nilfs_inode_by_name(d_inode(child), &dotdot);
8e656fd5 RK	455	if (!ino)
	456	return ERR_PTR(-ENOENT);
	457
2b0143b5	458	root = NILFS_I(d_inode(child))->i_root;
8e656fd5	459
2b0143b5	460	inode = nilfs_iget(d_inode(child)->i_sb, root, ino);
8e656fd5 RK	461	if (IS_ERR(inode))
	462	return ERR_CAST(inode);
	463
	464	return d_obtain_alias(inode);
	465	}
	466
	467	static struct dentry nilfs_get_dentry(struct super_block sb, u64 cno,
	468	u64 ino, u32 gen)
	469	{
	470	struct nilfs_root *root;
	471	struct inode *inode;
	472
	473	if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
	474	return ERR_PTR(-ESTALE);
	475
e3154e97	476	root = nilfs_lookup_root(sb->s_fs_info, cno);
8e656fd5 RK	477	if (!root)
	478	return ERR_PTR(-ESTALE);
	479
	480	inode = nilfs_iget(sb, root, ino);
	481	nilfs_put_root(root);
	482
	483	if (IS_ERR(inode))
	484	return ERR_CAST(inode);
	485	if (gen && inode->i_generation != gen) {
	486	iput(inode);
	487	return ERR_PTR(-ESTALE);
	488	}
	489	return d_obtain_alias(inode);
	490	}
	491
	492	static struct dentry nilfs_fh_to_dentry(struct super_block sb, struct fid *fh,
	493	int fh_len, int fh_type)
	494	{
	495	struct nilfs_fid fid = (struct nilfs_fid )fh;
	496
f73c2f1f	497	if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE \|\|
8e656fd5 RK	498	(fh_type != FILEID_NILFS_WITH_PARENT &&
	499	fh_type != FILEID_NILFS_WITHOUT_PARENT))
	500	return NULL;
	501
	502	return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
	503	}
	504
	505	static struct dentry nilfs_fh_to_parent(struct super_block sb, struct fid *fh,
	506	int fh_len, int fh_type)
	507	{
	508	struct nilfs_fid fid = (struct nilfs_fid )fh;
	509
f73c2f1f	510	if (fh_len < NILFS_FID_SIZE_CONNECTABLE \|\|
8e656fd5 RK	511	fh_type != FILEID_NILFS_WITH_PARENT)
	512	return NULL;
	513
	514	return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
	515	}
	516
b0b0382b AV	517	static int nilfs_encode_fh(struct inode inode, __u32 fh, int *lenp,
b0b0382b AV	518	struct inode *parent)
8e656fd5 RK	519	{
8e656fd5 RK	520	struct nilfs_fid fid = (struct nilfs_fid )fh;
8e656fd5 RK	521	struct nilfs_root *root = NILFS_I(inode)->i_root;
	522	int type;
	523
b0b0382b AV	524	if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
b0b0382b AV	525	*lenp = NILFS_FID_SIZE_CONNECTABLE;
94e07a75	526	return FILEID_INVALID;
b0b0382b AV	527	}
	528	if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
	529	*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
94e07a75	530	return FILEID_INVALID;
b0b0382b	531	}
8e656fd5 RK	532
	533	fid->cno = root->cno;
	534	fid->ino = inode->i_ino;
	535	fid->gen = inode->i_generation;
	536
b0b0382b	537	if (parent) {
8e656fd5 RK	538	fid->parent_ino = parent->i_ino;
8e656fd5 RK	539	fid->parent_gen = parent->i_generation;
8e656fd5 RK	540	type = FILEID_NILFS_WITH_PARENT;
	541	*lenp = NILFS_FID_SIZE_CONNECTABLE;
	542	} else {
	543	type = FILEID_NILFS_WITHOUT_PARENT;
	544	*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
	545	}
	546
	547	return type;
	548	}
	549
6e1d5dcc	550	const struct inode_operations nilfs_dir_inode_operations = {
d2500652 RK	551	.create = nilfs_create,
	552	.lookup = nilfs_lookup,
	553	.link = nilfs_link,
	554	.unlink = nilfs_unlink,
	555	.symlink = nilfs_symlink,
	556	.mkdir = nilfs_mkdir,
	557	.rmdir = nilfs_rmdir,
	558	.mknod = nilfs_mknod,
	559	.rename = nilfs_rename,
	560	.setattr = nilfs_setattr,
	561	.permission = nilfs_permission,
622daaff	562	.fiemap = nilfs_fiemap,
d2500652 RK	563	};
d2500652 RK	564
6e1d5dcc	565	const struct inode_operations nilfs_special_inode_operations = {
d2500652 RK	566	.setattr = nilfs_setattr,
	567	.permission = nilfs_permission,
	568	};
	569
6e1d5dcc	570	const struct inode_operations nilfs_symlink_inode_operations = {
d2500652	571	.readlink = generic_readlink,
6b255391	572	.get_link = page_get_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	};