[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;

	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);
	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_len != NILFS_FID_SIZE_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 RK	122
	123	if (!new_valid_dev(rdev))
	124	return -EINVAL;
	125
	126	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	127	if (err)
	128	return err;
	129	inode = nilfs_new_inode(dir, mode);
	130	err = PTR_ERR(inode);
	131	if (!IS_ERR(inode)) {
	132	init_special_inode(inode, inode->i_mode, rdev);
abdb318b	133	nilfs_mark_inode_dirty(inode);
d2500652 RK	134	err = nilfs_add_nondir(dentry, inode);
d2500652 RK	135	}
47420c79 RK	136	if (!err)
	137	err = nilfs_transaction_commit(dir->i_sb);
	138	else
	139	nilfs_transaction_abort(dir->i_sb);
	140
	141	return err;
d2500652 RK	142	}
	143
	144	static int nilfs_symlink(struct inode dir, struct dentry dentry,
	145	const char *symname)
	146	{
	147	struct nilfs_transaction_info ti;
	148	struct super_block *sb = dir->i_sb;
	149	unsigned l = strlen(symname)+1;
	150	struct inode *inode;
47420c79	151	int err;
d2500652 RK	152
	153	if (l > sb->s_blocksize)
	154	return -ENAMETOOLONG;
	155
	156	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	157	if (err)
	158	return err;
	159
	160	inode = nilfs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	161	err = PTR_ERR(inode);
	162	if (IS_ERR(inode))
	163	goto out;
	164
	165	/* slow symlink */
	166	inode->i_op = &nilfs_symlink_inode_operations;
	167	inode->i_mapping->a_ops = &nilfs_aops;
	168	err = page_symlink(inode, symname, l);
	169	if (err)
	170	goto out_fail;
	171
	172	/* mark_inode_dirty(inode); */
9ca941d4	173	/* page_symlink() do this */
d2500652 RK	174
	175	err = nilfs_add_nondir(dentry, inode);
	176	out:
47420c79 RK	177	if (!err)
	178	err = nilfs_transaction_commit(dir->i_sb);
	179	else
	180	nilfs_transaction_abort(dir->i_sb);
	181
	182	return err;
d2500652 RK	183
d2500652 RK	184	out_fail:
565de406	185	drop_nlink(inode);
abdb318b	186	nilfs_mark_inode_dirty(inode);
705304a8	187	unlock_new_inode(inode);
d2500652 RK	188	iput(inode);
	189	goto out;
	190	}
	191
	192	static int nilfs_link(struct dentry old_dentry, struct inode dir,
	193	struct dentry *dentry)
	194	{
2b0143b5	195	struct inode *inode = d_inode(old_dentry);
d2500652	196	struct nilfs_transaction_info ti;
47420c79	197	int err;
d2500652	198
d2500652 RK	199	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	200	if (err)
	201	return err;
	202
	203	inode->i_ctime = CURRENT_TIME;
	204	inode_inc_link_count(inode);
7de9c6ee	205	ihold(inode);
d2500652	206
705304a8 RK	207	err = nilfs_add_link(dentry, inode);
	208	if (!err) {
	209	d_instantiate(dentry, inode);
47420c79	210	err = nilfs_transaction_commit(dir->i_sb);
705304a8 RK	211	} else {
	212	inode_dec_link_count(inode);
	213	iput(inode);
47420c79	214	nilfs_transaction_abort(dir->i_sb);
705304a8	215	}
47420c79 RK	216
47420c79 RK	217	return err;
d2500652 RK	218	}
d2500652 RK	219
18bb1db3	220	static int nilfs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
d2500652 RK	221	{
	222	struct inode *inode;
	223	struct nilfs_transaction_info ti;
47420c79	224	int err;
d2500652	225
d2500652 RK	226	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	227	if (err)
	228	return err;
	229
565de406	230	inc_nlink(dir);
d2500652 RK	231
	232	inode = nilfs_new_inode(dir, S_IFDIR \| mode);
	233	err = PTR_ERR(inode);
	234	if (IS_ERR(inode))
	235	goto out_dir;
	236
	237	inode->i_op = &nilfs_dir_inode_operations;
	238	inode->i_fop = &nilfs_dir_operations;
	239	inode->i_mapping->a_ops = &nilfs_aops;
	240
565de406	241	inc_nlink(inode);
d2500652 RK	242
	243	err = nilfs_make_empty(inode, dir);
	244	if (err)
	245	goto out_fail;
	246
	247	err = nilfs_add_link(dentry, inode);
	248	if (err)
	249	goto out_fail;
	250
abdb318b	251	nilfs_mark_inode_dirty(inode);
d2500652	252	d_instantiate(dentry, inode);
705304a8	253	unlock_new_inode(inode);
d2500652	254	out:
47420c79 RK	255	if (!err)
	256	err = nilfs_transaction_commit(dir->i_sb);
	257	else
	258	nilfs_transaction_abort(dir->i_sb);
	259
	260	return err;
d2500652 RK	261
d2500652 RK	262	out_fail:
565de406	263	drop_nlink(inode);
565de406	264	drop_nlink(inode);
abdb318b	265	nilfs_mark_inode_dirty(inode);
705304a8	266	unlock_new_inode(inode);
d2500652 RK	267	iput(inode);
d2500652 RK	268	out_dir:
565de406	269	drop_nlink(dir);
abdb318b	270	nilfs_mark_inode_dirty(dir);
d2500652 RK	271	goto out;
	272	}
	273
4cd76c3c	274	static int nilfs_do_unlink(struct inode dir, struct dentry dentry)
d2500652 RK	275	{
	276	struct inode *inode;
	277	struct nilfs_dir_entry *de;
	278	struct page *page;
47420c79	279	int err;
d2500652	280
d2500652	281	err = -ENOENT;
0319003d	282	de = nilfs_find_entry(dir, &dentry->d_name, &page);
d2500652 RK	283	if (!de)
	284	goto out;
	285
2b0143b5	286	inode = d_inode(dentry);
d2500652 RK	287	err = -EIO;
	288	if (le64_to_cpu(de->inode) != inode->i_ino)
	289	goto out;
	290
	291	if (!inode->i_nlink) {
	292	nilfs_warning(inode->i_sb, __func__,
	293	"deleting nonexistent file (%lu), %d\n",
	294	inode->i_ino, inode->i_nlink);
bfe86848	295	set_nlink(inode, 1);
d2500652 RK	296	}
	297	err = nilfs_delete_entry(de, page);
	298	if (err)
	299	goto out;
	300
	301	inode->i_ctime = dir->i_ctime;
565de406	302	drop_nlink(inode);
d2500652 RK	303	err = 0;
d2500652 RK	304	out:
4cd76c3c JS	305	return err;
	306	}
	307
	308	static int nilfs_unlink(struct inode dir, struct dentry dentry)
	309	{
	310	struct nilfs_transaction_info ti;
	311	int err;
	312
	313	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	314	if (err)
	315	return err;
	316
	317	err = nilfs_do_unlink(dir, dentry);
	318
	319	if (!err) {
abdb318b	320	nilfs_mark_inode_dirty(dir);
2b0143b5	321	nilfs_mark_inode_dirty(d_inode(dentry));
47420c79	322	err = nilfs_transaction_commit(dir->i_sb);
4cd76c3c	323	} else
47420c79 RK	324	nilfs_transaction_abort(dir->i_sb);
	325
	326	return err;
d2500652 RK	327	}
	328
	329	static int nilfs_rmdir(struct inode dir, struct dentry dentry)
	330	{
2b0143b5	331	struct inode *inode = d_inode(dentry);
d2500652	332	struct nilfs_transaction_info ti;
47420c79	333	int err;
d2500652 RK	334
	335	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	336	if (err)
	337	return err;
	338
	339	err = -ENOTEMPTY;
	340	if (nilfs_empty_dir(inode)) {
4cd76c3c	341	err = nilfs_do_unlink(dir, dentry);
d2500652 RK	342	if (!err) {
d2500652 RK	343	inode->i_size = 0;
565de406	344	drop_nlink(inode);
abdb318b	345	nilfs_mark_inode_dirty(inode);
565de406	346	drop_nlink(dir);
abdb318b	347	nilfs_mark_inode_dirty(dir);
d2500652 RK	348	}
d2500652 RK	349	}
47420c79 RK	350	if (!err)
	351	err = nilfs_transaction_commit(dir->i_sb);
	352	else
	353	nilfs_transaction_abort(dir->i_sb);
	354
	355	return err;
d2500652 RK	356	}
	357
	358	static int nilfs_rename(struct inode old_dir, struct dentry old_dentry,
	359	struct inode new_dir, struct dentry new_dentry)
	360	{
2b0143b5 DH	361	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	362	struct inode *new_inode = d_inode(new_dentry);
d2500652 RK	363	struct page *dir_page = NULL;
	364	struct nilfs_dir_entry *dir_de = NULL;
	365	struct page *old_page;
	366	struct nilfs_dir_entry *old_de;
	367	struct nilfs_transaction_info ti;
	368	int err;
	369
	370	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
	371	if (unlikely(err))
	372	return err;
	373
	374	err = -ENOENT;
0319003d	375	old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
d2500652 RK	376	if (!old_de)
	377	goto out;
	378
	379	if (S_ISDIR(old_inode->i_mode)) {
	380	err = -EIO;
	381	dir_de = nilfs_dotdot(old_inode, &dir_page);
	382	if (!dir_de)
	383	goto out_old;
	384	}
	385
	386	if (new_inode) {
	387	struct page *new_page;
	388	struct nilfs_dir_entry *new_de;
	389
	390	err = -ENOTEMPTY;
	391	if (dir_de && !nilfs_empty_dir(new_inode))
	392	goto out_dir;
	393
	394	err = -ENOENT;
0319003d	395	new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
d2500652 RK	396	if (!new_de)
d2500652 RK	397	goto out_dir;
d2500652	398	nilfs_set_link(new_dir, new_de, new_page, old_inode);
abdb318b	399	nilfs_mark_inode_dirty(new_dir);
d2500652 RK	400	new_inode->i_ctime = CURRENT_TIME;
	401	if (dir_de)
	402	drop_nlink(new_inode);
565de406	403	drop_nlink(new_inode);
abdb318b	404	nilfs_mark_inode_dirty(new_inode);
d2500652	405	} else {
d2500652	406	err = nilfs_add_link(new_dentry, old_inode);
30eb43d3	407	if (err)
d2500652	408	goto out_dir;
565de406 JS	409	if (dir_de) {
565de406 JS	410	inc_nlink(new_dir);
abdb318b	411	nilfs_mark_inode_dirty(new_dir);
565de406	412	}
d2500652 RK	413	}
	414
	415	/*
	416	* Like most other Unix systems, set the ctime for inodes on a
	417	* rename.
d2500652 RK	418	*/
	419	old_inode->i_ctime = CURRENT_TIME;
	420
	421	nilfs_delete_entry(old_de, old_page);
d2500652 RK	422
	423	if (dir_de) {
	424	nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
565de406	425	drop_nlink(old_dir);
d2500652	426	}
abdb318b JS	427	nilfs_mark_inode_dirty(old_dir);
abdb318b JS	428	nilfs_mark_inode_dirty(old_inode);
d2500652	429
47420c79	430	err = nilfs_transaction_commit(old_dir->i_sb);
d2500652 RK	431	return err;
	432
	433	out_dir:
	434	if (dir_de) {
	435	kunmap(dir_page);
	436	page_cache_release(dir_page);
	437	}
	438	out_old:
	439	kunmap(old_page);
	440	page_cache_release(old_page);
	441	out:
47420c79	442	nilfs_transaction_abort(old_dir->i_sb);
d2500652 RK	443	return err;
	444	}
	445
8e656fd5 RK	446	/*
	447	* Export operations
	448	*/
	449	static struct dentry nilfs_get_parent(struct dentry child)
	450	{
	451	unsigned long ino;
	452	struct inode *inode;
26fe5750	453	struct qstr dotdot = QSTR_INIT("..", 2);
8e656fd5 RK	454	struct nilfs_root *root;
8e656fd5 RK	455
2b0143b5	456	ino = nilfs_inode_by_name(d_inode(child), &dotdot);
8e656fd5 RK	457	if (!ino)
	458	return ERR_PTR(-ENOENT);
	459
2b0143b5	460	root = NILFS_I(d_inode(child))->i_root;
8e656fd5	461
2b0143b5	462	inode = nilfs_iget(d_inode(child)->i_sb, root, ino);
8e656fd5 RK	463	if (IS_ERR(inode))
	464	return ERR_CAST(inode);
	465
	466	return d_obtain_alias(inode);
	467	}
	468
	469	static struct dentry nilfs_get_dentry(struct super_block sb, u64 cno,
	470	u64 ino, u32 gen)
	471	{
	472	struct nilfs_root *root;
	473	struct inode *inode;
	474
	475	if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
	476	return ERR_PTR(-ESTALE);
	477
e3154e97	478	root = nilfs_lookup_root(sb->s_fs_info, cno);
8e656fd5 RK	479	if (!root)
	480	return ERR_PTR(-ESTALE);
	481
	482	inode = nilfs_iget(sb, root, ino);
	483	nilfs_put_root(root);
	484
	485	if (IS_ERR(inode))
	486	return ERR_CAST(inode);
	487	if (gen && inode->i_generation != gen) {
	488	iput(inode);
	489	return ERR_PTR(-ESTALE);
	490	}
	491	return d_obtain_alias(inode);
	492	}
	493
	494	static struct dentry nilfs_fh_to_dentry(struct super_block sb, struct fid *fh,
	495	int fh_len, int fh_type)
	496	{
	497	struct nilfs_fid fid = (struct nilfs_fid )fh;
	498
	499	if ((fh_len != NILFS_FID_SIZE_NON_CONNECTABLE &&
	500	fh_len != NILFS_FID_SIZE_CONNECTABLE) \|\|
	501	(fh_type != FILEID_NILFS_WITH_PARENT &&
	502	fh_type != FILEID_NILFS_WITHOUT_PARENT))
	503	return NULL;
	504
	505	return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
	506	}
	507
	508	static struct dentry nilfs_fh_to_parent(struct super_block sb, struct fid *fh,
	509	int fh_len, int fh_type)
	510	{
	511	struct nilfs_fid fid = (struct nilfs_fid )fh;
	512
	513	if (fh_len != NILFS_FID_SIZE_CONNECTABLE \|\|
	514	fh_type != FILEID_NILFS_WITH_PARENT)
	515	return NULL;
	516
	517	return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
	518	}
	519
b0b0382b AV	520	static int nilfs_encode_fh(struct inode inode, __u32 fh, int *lenp,
b0b0382b AV	521	struct inode *parent)
8e656fd5 RK	522	{
8e656fd5 RK	523	struct nilfs_fid fid = (struct nilfs_fid )fh;
8e656fd5 RK	524	struct nilfs_root *root = NILFS_I(inode)->i_root;
	525	int type;
	526
b0b0382b AV	527	if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
b0b0382b AV	528	*lenp = NILFS_FID_SIZE_CONNECTABLE;
94e07a75	529	return FILEID_INVALID;
b0b0382b AV	530	}
	531	if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
	532	*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
94e07a75	533	return FILEID_INVALID;
b0b0382b	534	}
8e656fd5 RK	535
	536	fid->cno = root->cno;
	537	fid->ino = inode->i_ino;
	538	fid->gen = inode->i_generation;
	539
b0b0382b	540	if (parent) {
8e656fd5 RK	541	fid->parent_ino = parent->i_ino;
8e656fd5 RK	542	fid->parent_gen = parent->i_generation;
8e656fd5 RK	543	type = FILEID_NILFS_WITH_PARENT;
	544	*lenp = NILFS_FID_SIZE_CONNECTABLE;
	545	} else {
	546	type = FILEID_NILFS_WITHOUT_PARENT;
	547	*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
	548	}
	549
	550	return type;
	551	}
	552
6e1d5dcc	553	const struct inode_operations nilfs_dir_inode_operations = {
d2500652 RK	554	.create = nilfs_create,
	555	.lookup = nilfs_lookup,
	556	.link = nilfs_link,
	557	.unlink = nilfs_unlink,
	558	.symlink = nilfs_symlink,
	559	.mkdir = nilfs_mkdir,
	560	.rmdir = nilfs_rmdir,
	561	.mknod = nilfs_mknod,
	562	.rename = nilfs_rename,
	563	.setattr = nilfs_setattr,
	564	.permission = nilfs_permission,
622daaff	565	.fiemap = nilfs_fiemap,
d2500652 RK	566	};
d2500652 RK	567
6e1d5dcc	568	const struct inode_operations nilfs_special_inode_operations = {
d2500652 RK	569	.setattr = nilfs_setattr,
	570	.permission = nilfs_permission,
	571	};
	572
6e1d5dcc	573	const struct inode_operations nilfs_symlink_inode_operations = {
d2500652 RK	574	.readlink = generic_readlink,
	575	.follow_link = page_follow_link_light,
	576	.put_link = page_put_link,
dc3d3b81	577	.permission = nilfs_permission,
d2500652	578	};
8e656fd5 RK	579
	580	const struct export_operations nilfs_export_ops = {
	581	.encode_fh = nilfs_encode_fh,
	582	.fh_to_dentry = nilfs_fh_to_dentry,
	583	.fh_to_parent = nilfs_fh_to_parent,
	584	.get_parent = nilfs_get_parent,
	585	};