[linux-block.git] / fs / nilfs2 / namei.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * NILFS pathname lookup operations.
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * Modified for NILFS by Amagai Yoshiji and Ryusuke Konishi.
 */
/*
 *  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_new(dentry, 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 mnt_idmap *idmap, 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 mnt_idmap *idmap, 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 mnt_idmap *idmap, struct inode *dir,
			 struct dentry *dentry, const char *symname)
{
	struct nilfs_transaction_info ti;
	struct super_block *sb = dir->i_sb;
	unsigned int 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 | 0777);
	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);
	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 mnt_idmap *idmap, 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_new(dentry, inode);
out:
	if (!err)
		err = nilfs_transaction_commit(dir->i_sb);
	else
		nilfs_transaction_abort(dir->i_sb);

	return err;

out_fail:
	drop_nlink(inode);
	drop_nlink(inode);
	nilfs_mark_inode_dirty(inode);
	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_warn(inode->i_sb,
			   "deleting nonexistent file (ino=%lu), %d",
			   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 user_namespace *mnt_userns,
			struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry,
			unsigned int flags)
{
	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;

	if (flags & ~RENAME_NOREPLACE)
		return -EINVAL;

	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(new_inode);
		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(old_inode);

	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 nilfs_root *root;

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

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

	inode = nilfs_iget(child->d_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,
	.fileattr_get	= nilfs_fileattr_get,
	.fileattr_set	= nilfs_fileattr_set,
};

const struct inode_operations nilfs_special_inode_operations = {
	.setattr	= nilfs_setattr,
	.permission	= nilfs_permission,
};

const struct inode_operations nilfs_symlink_inode_operations = {
	.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
ae98043f	1	// SPDX-License-Identifier: GPL-2.0+
d2500652	2	/*
94ee1d91	3	* NILFS pathname lookup operations.
d2500652 RK	4	*
	5	* Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
	6	*
4b420ab4	7	* Modified for NILFS by Amagai Yoshiji and Ryusuke Konishi.
d2500652 RK	8	*/
	9	/*
	10	* linux/fs/ext2/namei.c
	11	*
	12	* Copyright (C) 1992, 1993, 1994, 1995
	13	* Remy Card (card@masi.ibp.fr)
	14	* Laboratoire MASI - Institut Blaise Pascal
	15	* Universite Pierre et Marie Curie (Paris VI)
	16	*
	17	* from
	18	*
	19	* linux/fs/minix/namei.c
	20	*
	21	* Copyright (C) 1991, 1992 Linus Torvalds
	22	*
	23	* Big-endian to little-endian byte-swapping/bitmaps by
	24	* David S. Miller (davem@caip.rutgers.edu), 1995
	25	*/
	26
	27	#include <linux/pagemap.h>
	28	#include "nilfs.h"
8e656fd5	29	#include "export.h"
d2500652	30
8e656fd5 RK	31	#define NILFS_FID_SIZE_NON_CONNECTABLE \
	32	(offsetof(struct nilfs_fid, parent_gen) / 4)
	33	#define NILFS_FID_SIZE_CONNECTABLE (sizeof(struct nilfs_fid) / 4)
d2500652 RK	34
	35	static inline int nilfs_add_nondir(struct dentry dentry, struct inode inode)
	36	{
	37	int err = nilfs_add_link(dentry, inode);
4ad364ca	38
d2500652	39	if (!err) {
1e2e547a	40	d_instantiate_new(dentry, inode);
d2500652 RK	41	return 0;
	42	}
	43	inode_dec_link_count(inode);
705304a8	44	unlock_new_inode(inode);
d2500652 RK	45	iput(inode);
	46	return err;
	47	}
	48
	49	/*
	50	* Methods themselves.
	51	*/
	52
	53	static struct dentry *
00cd8dd3	54	nilfs_lookup(struct inode dir, struct dentry dentry, unsigned int flags)
d2500652 RK	55	{
	56	struct inode *inode;
	57	ino_t ino;
	58
	59	if (dentry->d_name.len > NILFS_NAME_LEN)
	60	return ERR_PTR(-ENAMETOOLONG);
	61
0319003d	62	ino = nilfs_inode_by_name(dir, &dentry->d_name);
a9049376	63	inode = ino ? nilfs_iget(dir->i_sb, NILFS_I(dir)->i_root, ino) : NULL;
d2500652 RK	64	return d_splice_alias(inode, dentry);
	65	}
	66
d2500652 RK	67	/*
	68	* By the time this is called, we already have created
	69	* the directory cache entry for the new file, but it
	70	* is so far negative - it has no inode.
	71	*
	72	* If the create succeeds, we fill in the inode information
	73	* with d_instantiate().
	74	*/
6c960e68	75	static int nilfs_create(struct mnt_idmap idmap, struct inode dir,
549c7297	76	struct dentry *dentry, umode_t mode, bool excl)
d2500652 RK	77	{
	78	struct inode *inode;
	79	struct nilfs_transaction_info ti;
47420c79	80	int err;
d2500652 RK	81
	82	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	83	if (err)
	84	return err;
	85	inode = nilfs_new_inode(dir, mode);
	86	err = PTR_ERR(inode);
	87	if (!IS_ERR(inode)) {
	88	inode->i_op = &nilfs_file_inode_operations;
	89	inode->i_fop = &nilfs_file_operations;
	90	inode->i_mapping->a_ops = &nilfs_aops;
abdb318b	91	nilfs_mark_inode_dirty(inode);
d2500652 RK	92	err = nilfs_add_nondir(dentry, inode);
d2500652 RK	93	}
47420c79 RK	94	if (!err)
	95	err = nilfs_transaction_commit(dir->i_sb);
	96	else
	97	nilfs_transaction_abort(dir->i_sb);
	98
	99	return err;
d2500652 RK	100	}
	101
	102	static int
5ebb29be	103	nilfs_mknod(struct mnt_idmap idmap, struct inode dir,
549c7297	104	struct dentry *dentry, umode_t mode, dev_t rdev)
d2500652 RK	105	{
	106	struct inode *inode;
	107	struct nilfs_transaction_info ti;
47420c79	108	int err;
d2500652	109
d2500652 RK	110	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	111	if (err)
	112	return err;
	113	inode = nilfs_new_inode(dir, mode);
	114	err = PTR_ERR(inode);
	115	if (!IS_ERR(inode)) {
	116	init_special_inode(inode, inode->i_mode, rdev);
abdb318b	117	nilfs_mark_inode_dirty(inode);
d2500652 RK	118	err = nilfs_add_nondir(dentry, inode);
d2500652 RK	119	}
47420c79 RK	120	if (!err)
	121	err = nilfs_transaction_commit(dir->i_sb);
	122	else
	123	nilfs_transaction_abort(dir->i_sb);
	124
	125	return err;
d2500652 RK	126	}
d2500652 RK	127
7a77db95	128	static int nilfs_symlink(struct mnt_idmap idmap, struct inode dir,
549c7297	129	struct dentry dentry, const char symname)
d2500652 RK	130	{
	131	struct nilfs_transaction_info ti;
	132	struct super_block *sb = dir->i_sb;
0c6c44cb	133	unsigned int l = strlen(symname) + 1;
d2500652	134	struct inode *inode;
47420c79	135	int err;
d2500652 RK	136
	137	if (l > sb->s_blocksize)
	138	return -ENAMETOOLONG;
	139
	140	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	141	if (err)
	142	return err;
	143
3147db89	144	inode = nilfs_new_inode(dir, S_IFLNK \| 0777);
d2500652 RK	145	err = PTR_ERR(inode);
	146	if (IS_ERR(inode))
	147	goto out;
	148
	149	/* slow symlink */
	150	inode->i_op = &nilfs_symlink_inode_operations;
21fc61c7	151	inode_nohighmem(inode);
d2500652 RK	152	inode->i_mapping->a_ops = &nilfs_aops;
	153	err = page_symlink(inode, symname, l);
	154	if (err)
	155	goto out_fail;
	156
	157	/* mark_inode_dirty(inode); */
9ca941d4	158	/* page_symlink() do this */
d2500652 RK	159
	160	err = nilfs_add_nondir(dentry, inode);
	161	out:
47420c79 RK	162	if (!err)
	163	err = nilfs_transaction_commit(dir->i_sb);
	164	else
	165	nilfs_transaction_abort(dir->i_sb);
	166
	167	return err;
d2500652 RK	168
d2500652 RK	169	out_fail:
565de406	170	drop_nlink(inode);
abdb318b	171	nilfs_mark_inode_dirty(inode);
705304a8	172	unlock_new_inode(inode);
d2500652 RK	173	iput(inode);
	174	goto out;
	175	}
	176
	177	static int nilfs_link(struct dentry old_dentry, struct inode dir,
	178	struct dentry *dentry)
	179	{
2b0143b5	180	struct inode *inode = d_inode(old_dentry);
d2500652	181	struct nilfs_transaction_info ti;
47420c79	182	int err;
d2500652	183
d2500652 RK	184	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	185	if (err)
	186	return err;
	187
078cd827	188	inode->i_ctime = current_time(inode);
d2500652	189	inode_inc_link_count(inode);
7de9c6ee	190	ihold(inode);
d2500652	191
705304a8 RK	192	err = nilfs_add_link(dentry, inode);
	193	if (!err) {
	194	d_instantiate(dentry, inode);
47420c79	195	err = nilfs_transaction_commit(dir->i_sb);
705304a8 RK	196	} else {
	197	inode_dec_link_count(inode);
	198	iput(inode);
47420c79	199	nilfs_transaction_abort(dir->i_sb);
705304a8	200	}
47420c79 RK	201
47420c79 RK	202	return err;
d2500652 RK	203	}
d2500652 RK	204
c54bd91e	205	static int nilfs_mkdir(struct mnt_idmap idmap, struct inode dir,
549c7297	206	struct dentry *dentry, umode_t mode)
d2500652 RK	207	{
	208	struct inode *inode;
	209	struct nilfs_transaction_info ti;
47420c79	210	int err;
d2500652	211
d2500652 RK	212	err = nilfs_transaction_begin(dir->i_sb, &ti, 1);
	213	if (err)
	214	return err;
	215
565de406	216	inc_nlink(dir);
d2500652 RK	217
	218	inode = nilfs_new_inode(dir, S_IFDIR \| mode);
	219	err = PTR_ERR(inode);
	220	if (IS_ERR(inode))
	221	goto out_dir;
	222
	223	inode->i_op = &nilfs_dir_inode_operations;
	224	inode->i_fop = &nilfs_dir_operations;
	225	inode->i_mapping->a_ops = &nilfs_aops;
	226
565de406	227	inc_nlink(inode);
d2500652 RK	228
	229	err = nilfs_make_empty(inode, dir);
	230	if (err)
	231	goto out_fail;
	232
	233	err = nilfs_add_link(dentry, inode);
	234	if (err)
	235	goto out_fail;
	236
abdb318b	237	nilfs_mark_inode_dirty(inode);
1e2e547a	238	d_instantiate_new(dentry, inode);
d2500652	239	out:
47420c79 RK	240	if (!err)
	241	err = nilfs_transaction_commit(dir->i_sb);
	242	else
	243	nilfs_transaction_abort(dir->i_sb);
	244
	245	return err;
d2500652 RK	246
d2500652 RK	247	out_fail:
565de406	248	drop_nlink(inode);
565de406	249	drop_nlink(inode);
abdb318b	250	nilfs_mark_inode_dirty(inode);
705304a8	251	unlock_new_inode(inode);
d2500652 RK	252	iput(inode);
d2500652 RK	253	out_dir:
565de406	254	drop_nlink(dir);
abdb318b	255	nilfs_mark_inode_dirty(dir);
d2500652 RK	256	goto out;
	257	}
	258
4cd76c3c	259	static int nilfs_do_unlink(struct inode dir, struct dentry dentry)
d2500652 RK	260	{
	261	struct inode *inode;
	262	struct nilfs_dir_entry *de;
	263	struct page *page;
47420c79	264	int err;
d2500652	265
d2500652	266	err = -ENOENT;
0319003d	267	de = nilfs_find_entry(dir, &dentry->d_name, &page);
d2500652 RK	268	if (!de)
	269	goto out;
	270
2b0143b5	271	inode = d_inode(dentry);
d2500652 RK	272	err = -EIO;
	273	if (le64_to_cpu(de->inode) != inode->i_ino)
	274	goto out;
	275
	276	if (!inode->i_nlink) {
a1d0747a JP	277	nilfs_warn(inode->i_sb,
	278	"deleting nonexistent file (ino=%lu), %d",
	279	inode->i_ino, inode->i_nlink);
bfe86848	280	set_nlink(inode, 1);
d2500652 RK	281	}
	282	err = nilfs_delete_entry(de, page);
	283	if (err)
	284	goto out;
	285
	286	inode->i_ctime = dir->i_ctime;
565de406	287	drop_nlink(inode);
d2500652 RK	288	err = 0;
d2500652 RK	289	out:
4cd76c3c JS	290	return err;
	291	}
	292
	293	static int nilfs_unlink(struct inode dir, struct dentry dentry)
	294	{
	295	struct nilfs_transaction_info ti;
	296	int err;
	297
	298	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	299	if (err)
	300	return err;
	301
	302	err = nilfs_do_unlink(dir, dentry);
	303
	304	if (!err) {
abdb318b	305	nilfs_mark_inode_dirty(dir);
2b0143b5	306	nilfs_mark_inode_dirty(d_inode(dentry));
47420c79	307	err = nilfs_transaction_commit(dir->i_sb);
4cd76c3c	308	} else
47420c79 RK	309	nilfs_transaction_abort(dir->i_sb);
	310
	311	return err;
d2500652 RK	312	}
	313
	314	static int nilfs_rmdir(struct inode dir, struct dentry dentry)
	315	{
2b0143b5	316	struct inode *inode = d_inode(dentry);
d2500652	317	struct nilfs_transaction_info ti;
47420c79	318	int err;
d2500652 RK	319
	320	err = nilfs_transaction_begin(dir->i_sb, &ti, 0);
	321	if (err)
	322	return err;
	323
	324	err = -ENOTEMPTY;
	325	if (nilfs_empty_dir(inode)) {
4cd76c3c	326	err = nilfs_do_unlink(dir, dentry);
d2500652 RK	327	if (!err) {
d2500652 RK	328	inode->i_size = 0;
565de406	329	drop_nlink(inode);
abdb318b	330	nilfs_mark_inode_dirty(inode);
565de406	331	drop_nlink(dir);
abdb318b	332	nilfs_mark_inode_dirty(dir);
d2500652 RK	333	}
d2500652 RK	334	}
47420c79 RK	335	if (!err)
	336	err = nilfs_transaction_commit(dir->i_sb);
	337	else
	338	nilfs_transaction_abort(dir->i_sb);
	339
	340	return err;
d2500652 RK	341	}
d2500652 RK	342
549c7297 CB	343	static int nilfs_rename(struct user_namespace *mnt_userns,
	344	struct inode old_dir, struct dentry old_dentry,
	345	struct inode new_dir, struct dentry new_dentry,
f03b8ad8	346	unsigned int flags)
d2500652	347	{
2b0143b5 DH	348	struct inode *old_inode = d_inode(old_dentry);
2b0143b5 DH	349	struct inode *new_inode = d_inode(new_dentry);
d2500652 RK	350	struct page *dir_page = NULL;
	351	struct nilfs_dir_entry *dir_de = NULL;
	352	struct page *old_page;
	353	struct nilfs_dir_entry *old_de;
	354	struct nilfs_transaction_info ti;
	355	int err;
	356
f03b8ad8 MS	357	if (flags & ~RENAME_NOREPLACE)
	358	return -EINVAL;
	359
d2500652 RK	360	err = nilfs_transaction_begin(old_dir->i_sb, &ti, 1);
	361	if (unlikely(err))
	362	return err;
	363
	364	err = -ENOENT;
0319003d	365	old_de = nilfs_find_entry(old_dir, &old_dentry->d_name, &old_page);
d2500652 RK	366	if (!old_de)
	367	goto out;
	368
	369	if (S_ISDIR(old_inode->i_mode)) {
	370	err = -EIO;
	371	dir_de = nilfs_dotdot(old_inode, &dir_page);
	372	if (!dir_de)
	373	goto out_old;
	374	}
	375
	376	if (new_inode) {
	377	struct page *new_page;
	378	struct nilfs_dir_entry *new_de;
	379
	380	err = -ENOTEMPTY;
	381	if (dir_de && !nilfs_empty_dir(new_inode))
	382	goto out_dir;
	383
	384	err = -ENOENT;
0319003d	385	new_de = nilfs_find_entry(new_dir, &new_dentry->d_name, &new_page);
d2500652 RK	386	if (!new_de)
d2500652 RK	387	goto out_dir;
d2500652	388	nilfs_set_link(new_dir, new_de, new_page, old_inode);
abdb318b	389	nilfs_mark_inode_dirty(new_dir);
078cd827	390	new_inode->i_ctime = current_time(new_inode);
d2500652 RK	391	if (dir_de)
d2500652 RK	392	drop_nlink(new_inode);
565de406	393	drop_nlink(new_inode);
abdb318b	394	nilfs_mark_inode_dirty(new_inode);
d2500652	395	} else {
d2500652	396	err = nilfs_add_link(new_dentry, old_inode);
30eb43d3	397	if (err)
d2500652	398	goto out_dir;
565de406 JS	399	if (dir_de) {
565de406 JS	400	inc_nlink(new_dir);
abdb318b	401	nilfs_mark_inode_dirty(new_dir);
565de406	402	}
d2500652 RK	403	}
	404
	405	/*
	406	* Like most other Unix systems, set the ctime for inodes on a
	407	* rename.
d2500652	408	*/
078cd827	409	old_inode->i_ctime = current_time(old_inode);
d2500652 RK	410
d2500652 RK	411	nilfs_delete_entry(old_de, old_page);
d2500652 RK	412
	413	if (dir_de) {
	414	nilfs_set_link(old_inode, dir_de, dir_page, new_dir);
565de406	415	drop_nlink(old_dir);
d2500652	416	}
abdb318b JS	417	nilfs_mark_inode_dirty(old_dir);
abdb318b JS	418	nilfs_mark_inode_dirty(old_inode);
d2500652	419
47420c79	420	err = nilfs_transaction_commit(old_dir->i_sb);
d2500652 RK	421	return err;
	422
	423	out_dir:
	424	if (dir_de) {
	425	kunmap(dir_page);
09cbfeaf	426	put_page(dir_page);
d2500652 RK	427	}
	428	out_old:
	429	kunmap(old_page);
09cbfeaf	430	put_page(old_page);
d2500652	431	out:
47420c79	432	nilfs_transaction_abort(old_dir->i_sb);
d2500652 RK	433	return err;
	434	}
	435
8e656fd5 RK	436	/*
	437	* Export operations
	438	*/
	439	static struct dentry nilfs_get_parent(struct dentry child)
	440	{
	441	unsigned long ino;
	442	struct inode *inode;
8e656fd5 RK	443	struct nilfs_root *root;
8e656fd5 RK	444
80e5d1ff	445	ino = nilfs_inode_by_name(d_inode(child), &dotdot_name);
8e656fd5 RK	446	if (!ino)
	447	return ERR_PTR(-ENOENT);
	448
2b0143b5	449	root = NILFS_I(d_inode(child))->i_root;
8e656fd5	450
fc64005c	451	inode = nilfs_iget(child->d_sb, root, ino);
8e656fd5 RK	452	if (IS_ERR(inode))
	453	return ERR_CAST(inode);
	454
	455	return d_obtain_alias(inode);
	456	}
	457
	458	static struct dentry nilfs_get_dentry(struct super_block sb, u64 cno,
	459	u64 ino, u32 gen)
	460	{
	461	struct nilfs_root *root;
	462	struct inode *inode;
	463
	464	if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO)
	465	return ERR_PTR(-ESTALE);
	466
e3154e97	467	root = nilfs_lookup_root(sb->s_fs_info, cno);
8e656fd5 RK	468	if (!root)
	469	return ERR_PTR(-ESTALE);
	470
	471	inode = nilfs_iget(sb, root, ino);
	472	nilfs_put_root(root);
	473
	474	if (IS_ERR(inode))
	475	return ERR_CAST(inode);
	476	if (gen && inode->i_generation != gen) {
	477	iput(inode);
	478	return ERR_PTR(-ESTALE);
	479	}
	480	return d_obtain_alias(inode);
	481	}
	482
	483	static struct dentry nilfs_fh_to_dentry(struct super_block sb, struct fid *fh,
	484	int fh_len, int fh_type)
	485	{
	486	struct nilfs_fid fid = (struct nilfs_fid )fh;
	487
f73c2f1f	488	if (fh_len < NILFS_FID_SIZE_NON_CONNECTABLE \|\|
8e656fd5 RK	489	(fh_type != FILEID_NILFS_WITH_PARENT &&
	490	fh_type != FILEID_NILFS_WITHOUT_PARENT))
	491	return NULL;
	492
	493	return nilfs_get_dentry(sb, fid->cno, fid->ino, fid->gen);
	494	}
	495
	496	static struct dentry nilfs_fh_to_parent(struct super_block sb, struct fid *fh,
	497	int fh_len, int fh_type)
	498	{
	499	struct nilfs_fid fid = (struct nilfs_fid )fh;
	500
f73c2f1f	501	if (fh_len < NILFS_FID_SIZE_CONNECTABLE \|\|
8e656fd5 RK	502	fh_type != FILEID_NILFS_WITH_PARENT)
	503	return NULL;
	504
	505	return nilfs_get_dentry(sb, fid->cno, fid->parent_ino, fid->parent_gen);
	506	}
	507
b0b0382b AV	508	static int nilfs_encode_fh(struct inode inode, __u32 fh, int *lenp,
b0b0382b AV	509	struct inode *parent)
8e656fd5 RK	510	{
8e656fd5 RK	511	struct nilfs_fid fid = (struct nilfs_fid )fh;
8e656fd5 RK	512	struct nilfs_root *root = NILFS_I(inode)->i_root;
	513	int type;
	514
b0b0382b AV	515	if (parent && *lenp < NILFS_FID_SIZE_CONNECTABLE) {
b0b0382b AV	516	*lenp = NILFS_FID_SIZE_CONNECTABLE;
94e07a75	517	return FILEID_INVALID;
b0b0382b AV	518	}
	519	if (*lenp < NILFS_FID_SIZE_NON_CONNECTABLE) {
	520	*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
94e07a75	521	return FILEID_INVALID;
b0b0382b	522	}
8e656fd5 RK	523
	524	fid->cno = root->cno;
	525	fid->ino = inode->i_ino;
	526	fid->gen = inode->i_generation;
	527
b0b0382b	528	if (parent) {
8e656fd5 RK	529	fid->parent_ino = parent->i_ino;
8e656fd5 RK	530	fid->parent_gen = parent->i_generation;
8e656fd5 RK	531	type = FILEID_NILFS_WITH_PARENT;
	532	*lenp = NILFS_FID_SIZE_CONNECTABLE;
	533	} else {
	534	type = FILEID_NILFS_WITHOUT_PARENT;
	535	*lenp = NILFS_FID_SIZE_NON_CONNECTABLE;
	536	}
	537
	538	return type;
	539	}
	540
6e1d5dcc	541	const struct inode_operations nilfs_dir_inode_operations = {
d2500652 RK	542	.create = nilfs_create,
	543	.lookup = nilfs_lookup,
	544	.link = nilfs_link,
	545	.unlink = nilfs_unlink,
	546	.symlink = nilfs_symlink,
	547	.mkdir = nilfs_mkdir,
	548	.rmdir = nilfs_rmdir,
	549	.mknod = nilfs_mknod,
	550	.rename = nilfs_rename,
	551	.setattr = nilfs_setattr,
	552	.permission = nilfs_permission,
622daaff	553	.fiemap = nilfs_fiemap,
7c7c436e MS	554	.fileattr_get = nilfs_fileattr_get,
7c7c436e MS	555	.fileattr_set = nilfs_fileattr_set,
d2500652 RK	556	};
d2500652 RK	557
6e1d5dcc	558	const struct inode_operations nilfs_special_inode_operations = {
d2500652 RK	559	.setattr = nilfs_setattr,
	560	.permission = nilfs_permission,
	561	};
	562
6e1d5dcc	563	const struct inode_operations nilfs_symlink_inode_operations = {
6b255391	564	.get_link = page_get_link,
dc3d3b81	565	.permission = nilfs_permission,
d2500652	566	};
8e656fd5 RK	567
	568	const struct export_operations nilfs_export_ops = {
	569	.encode_fh = nilfs_encode_fh,
	570	.fh_to_dentry = nilfs_fh_to_dentry,
	571	.fh_to_parent = nilfs_fh_to_parent,
	572	.get_parent = nilfs_get_parent,
	573	};