[deliverable/linux.git] / fs / f2fs / namei.c

/*
 * fs/f2fs/namei.c
 *
 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
 *             http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/fs.h>
#include <linux/f2fs_fs.h>
#include <linux/pagemap.h>
#include <linux/sched.h>
#include <linux/ctype.h>

#include "f2fs.h"
#include "node.h"
#include "xattr.h"
#include "acl.h"
#include <trace/events/f2fs.h>

static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	nid_t ino;
	struct inode *inode;
	bool nid_free = false;
	int err, ilock;

	inode = new_inode(sb);
	if (!inode)
		return ERR_PTR(-ENOMEM);

	ilock = mutex_lock_op(sbi);
	if (!alloc_nid(sbi, &ino)) {
		mutex_unlock_op(sbi, ilock);
		err = -ENOSPC;
		goto fail;
	}
	mutex_unlock_op(sbi, ilock);

	inode->i_uid = current_fsuid();

	if (dir->i_mode & S_ISGID) {
		inode->i_gid = dir->i_gid;
		if (S_ISDIR(mode))
			mode |= S_ISGID;
	} else {
		inode->i_gid = current_fsgid();
	}

	inode->i_ino = ino;
	inode->i_mode = mode;
	inode->i_blocks = 0;
	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	inode->i_generation = sbi->s_next_generation++;

	err = insert_inode_locked(inode);
	if (err) {
		err = -EINVAL;
		nid_free = true;
		goto out;
	}
	trace_f2fs_new_inode(inode, 0);
	mark_inode_dirty(inode);
	return inode;

out:
	clear_nlink(inode);
	unlock_new_inode(inode);
fail:
	trace_f2fs_new_inode(inode, err);
	make_bad_inode(inode);
	iput(inode);
	if (nid_free)
		alloc_nid_failed(sbi, ino);
	return ERR_PTR(err);
}

static int is_multimedia_file(const unsigned char *s, const char *sub)
{
	size_t slen = strlen(s);
	size_t sublen = strlen(sub);
	int ret;

	if (sublen > slen)
		return 0;

	ret = memcmp(s + slen - sublen, sub, sublen);
	if (ret) {	/* compare upper case */
		int i;
		char upper_sub[8];
		for (i = 0; i < sublen && i < sizeof(upper_sub); i++)
			upper_sub[i] = toupper(sub[i]);
		return !memcmp(s + slen - sublen, upper_sub, sublen);
	}

	return !ret;
}

/*
 * Set multimedia files as cold files for hot/cold data separation
 */
static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
		const unsigned char *name)
{
	int i;
	__u8 (*extlist)[8] = sbi->raw_super->extension_list;

	int count = le32_to_cpu(sbi->raw_super->extension_count);
	for (i = 0; i < count; i++) {
		if (is_multimedia_file(name, extlist[i])) {
			file_set_cold(inode);
			break;
		}
	}
}

static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
						bool excl)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode;
	nid_t ino = 0;
	int err, ilock;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
		set_cold_files(sbi, inode, dentry->d_name.name);

	inode->i_op = &f2fs_file_inode_operations;
	inode->i_fop = &f2fs_file_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	ino = inode->i_ino;

	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	if (err)
		goto out;

	alloc_nid_done(sbi, ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	return 0;
out:
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, ino);
	return err;
}

static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
		struct dentry *dentry)
{
	struct inode *inode = old_dentry->d_inode;
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	int err, ilock;

	f2fs_balance_fs(sbi);

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

	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	if (err)
		goto out;

	d_instantiate(dentry, inode);
	return 0;
out:
	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	iput(inode);
	return err;
}

struct dentry *f2fs_get_parent(struct dentry *child)
{
	struct qstr dotdot = QSTR_INIT("..", 2);
	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	if (!ino)
		return ERR_PTR(-ENOENT);
	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
}

static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
		unsigned int flags)
{
	struct inode *inode = NULL;
	struct f2fs_dir_entry *de;
	struct page *page;

	if (dentry->d_name.len > F2FS_NAME_LEN)
		return ERR_PTR(-ENAMETOOLONG);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	if (de) {
		nid_t ino = le32_to_cpu(de->ino);
		kunmap(page);
		f2fs_put_page(page, 0);

		inode = f2fs_iget(dir->i_sb, ino);
		if (IS_ERR(inode))
			return ERR_CAST(inode);
	}

	return d_splice_alias(inode, dentry);
}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode = dentry->d_inode;
	struct f2fs_dir_entry *de;
	struct page *page;
	int err = -ENOENT;
	int ilock;

	trace_f2fs_unlink_enter(dir, dentry);
	f2fs_balance_fs(sbi);

	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	if (!de)
		goto fail;

	err = check_orphan_space(sbi);
	if (err) {
		kunmap(page);
		f2fs_put_page(page, 0);
		goto fail;
	}

	ilock = mutex_lock_op(sbi);
	f2fs_delete_entry(de, page, inode);
	mutex_unlock_op(sbi, ilock);

	/* In order to evict this inode,  we set it dirty */
	mark_inode_dirty(inode);
fail:
	trace_f2fs_unlink_exit(inode, err);
	return err;
}

static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
					const char *symname)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode;
	size_t symlen = strlen(symname) + 1;
	int err, ilock;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &f2fs_symlink_inode_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;

	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	if (err)
		goto out;

	err = page_symlink(inode, symname, symlen);
	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	return err;
out:
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, inode->i_ino);
	return err;
}

static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	struct inode *inode;
	int err, ilock;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, S_IFDIR | mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	inode->i_op = &f2fs_dir_inode_operations;
	inode->i_fop = &f2fs_dir_operations;
	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);

	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	if (err)
		goto out_fail;

	alloc_nid_done(sbi, inode->i_ino);

	d_instantiate(dentry, inode);
	unlock_new_inode(inode);

	return 0;

out_fail:
	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, inode->i_ino);
	return err;
}

static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
{
	struct inode *inode = dentry->d_inode;
	if (f2fs_empty_dir(inode))
		return f2fs_unlink(dir, dentry);
	return -ENOTEMPTY;
}

static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
				umode_t mode, dev_t rdev)
{
	struct super_block *sb = dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *inode;
	int err = 0;
	int ilock;

	if (!new_valid_dev(rdev))
		return -EINVAL;

	f2fs_balance_fs(sbi);

	inode = f2fs_new_inode(dir, mode);
	if (IS_ERR(inode))
		return PTR_ERR(inode);

	init_special_inode(inode, inode->i_mode, rdev);
	inode->i_op = &f2fs_special_inode_operations;

	ilock = mutex_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	mutex_unlock_op(sbi, ilock);
	if (err)
		goto out;

	alloc_nid_done(sbi, inode->i_ino);
	d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	return 0;
out:
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, inode->i_ino);
	return err;
}

static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
			struct inode *new_dir, struct dentry *new_dentry)
{
	struct super_block *sb = old_dir->i_sb;
	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	struct inode *old_inode = old_dentry->d_inode;
	struct inode *new_inode = new_dentry->d_inode;
	struct page *old_dir_page;
	struct page *old_page;
	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
	int err = -ENOENT, ilock = -1;

	f2fs_balance_fs(sbi);

	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	if (!old_entry)
		goto out;

	if (S_ISDIR(old_inode->i_mode)) {
		err = -EIO;
		old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
		if (!old_dir_entry)
			goto out_old;
	}

	ilock = mutex_lock_op(sbi);

	if (new_inode) {
		struct page *new_page;

		err = -ENOTEMPTY;
		if (old_dir_entry && !f2fs_empty_dir(new_inode))
			goto out_dir;

		err = -ENOENT;
		new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
						&new_page);
		if (!new_entry)
			goto out_dir;

		if (update_dent_inode(old_inode, &new_dentry->d_name)) {
			f2fs_put_page(new_page, 1);
			goto out_dir;
		}

		f2fs_set_link(new_dir, new_entry, new_page, old_inode);

		new_inode->i_ctime = CURRENT_TIME;
		if (old_dir_entry)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
		if (!new_inode->i_nlink)
			add_orphan_inode(sbi, new_inode->i_ino);
		update_inode_page(new_inode);
	} else {
		err = f2fs_add_link(new_dentry, old_inode);
		if (err)
			goto out_dir;

		if (old_dir_entry) {
			inc_nlink(new_dir);
			update_inode_page(new_dir);
		}
	}

	old_inode->i_ctime = CURRENT_TIME;
	mark_inode_dirty(old_inode);

	f2fs_delete_entry(old_entry, old_page, NULL);

	if (old_dir_entry) {
		if (old_dir != new_dir) {
			f2fs_set_link(old_inode, old_dir_entry,
						old_dir_page, new_dir);
		} else {
			kunmap(old_dir_page);
			f2fs_put_page(old_dir_page, 0);
		}
		drop_nlink(old_dir);
		update_inode_page(old_dir);
	}

	mutex_unlock_op(sbi, ilock);
	return 0;

out_dir:
	if (old_dir_entry) {
		kunmap(old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
	mutex_unlock_op(sbi, ilock);
out_old:
	kunmap(old_page);
	f2fs_put_page(old_page, 0);
out:
	return err;
}

const struct inode_operations f2fs_dir_inode_operations = {
	.create		= f2fs_create,
	.lookup		= f2fs_lookup,
	.link		= f2fs_link,
	.unlink		= f2fs_unlink,
	.symlink	= f2fs_symlink,
	.mkdir		= f2fs_mkdir,
	.rmdir		= f2fs_rmdir,
	.mknod		= f2fs_mknod,
	.rename		= f2fs_rename,
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
	.get_acl	= f2fs_get_acl,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
#endif
};

const struct inode_operations f2fs_symlink_inode_operations = {
	.readlink       = generic_readlink,
	.follow_link    = page_follow_link_light,
	.put_link       = page_put_link,
	.getattr	= f2fs_getattr,
	.setattr	= f2fs_setattr,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr	= generic_setxattr,
	.getxattr	= generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr	= generic_removexattr,
#endif
};

const struct inode_operations f2fs_special_inode_operations = {
	.getattr	= f2fs_getattr,
	.setattr        = f2fs_setattr,
	.get_acl	= f2fs_get_acl,
#ifdef CONFIG_F2FS_FS_XATTR
	.setxattr       = generic_setxattr,
	.getxattr       = generic_getxattr,
	.listxattr	= f2fs_listxattr,
	.removexattr    = generic_removexattr,
#endif
};
Commit	Line	Data
0a8165d7	1	/*
57397d86 JK	2	* fs/f2fs/namei.c
	3	*
	4	* Copyright (c) 2012 Samsung Electronics Co., Ltd.
	5	* http://www.samsung.com/
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11	#include <linux/fs.h>
	12	#include <linux/f2fs_fs.h>
	13	#include <linux/pagemap.h>
	14	#include <linux/sched.h>
	15	#include <linux/ctype.h>
	16
	17	#include "f2fs.h"
953a3e27	18	#include "node.h"
57397d86 JK	19	#include "xattr.h"
57397d86 JK	20	#include "acl.h"
a2a4a7e4	21	#include <trace/events/f2fs.h>
57397d86 JK	22
	23	static struct inode f2fs_new_inode(struct inode dir, umode_t mode)
	24	{
	25	struct super_block *sb = dir->i_sb;
	26	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	27	nid_t ino;
	28	struct inode *inode;
	29	bool nid_free = false;
39936837	30	int err, ilock;
57397d86 JK	31
	32	inode = new_inode(sb);
	33	if (!inode)
	34	return ERR_PTR(-ENOMEM);
	35
39936837	36	ilock = mutex_lock_op(sbi);
57397d86	37	if (!alloc_nid(sbi, &ino)) {
39936837	38	mutex_unlock_op(sbi, ilock);
57397d86 JK	39	err = -ENOSPC;
	40	goto fail;
	41	}
39936837	42	mutex_unlock_op(sbi, ilock);
57397d86 JK	43
	44	inode->i_uid = current_fsuid();
	45
	46	if (dir->i_mode & S_ISGID) {
	47	inode->i_gid = dir->i_gid;
	48	if (S_ISDIR(mode))
	49	mode \|= S_ISGID;
	50	} else {
	51	inode->i_gid = current_fsgid();
	52	}
	53
	54	inode->i_ino = ino;
	55	inode->i_mode = mode;
	56	inode->i_blocks = 0;
	57	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	58	inode->i_generation = sbi->s_next_generation++;
	59
	60	err = insert_inode_locked(inode);
	61	if (err) {
	62	err = -EINVAL;
	63	nid_free = true;
	64	goto out;
	65	}
d70b4f53	66	trace_f2fs_new_inode(inode, 0);
57397d86 JK	67	mark_inode_dirty(inode);
	68	return inode;
	69
	70	out:
	71	clear_nlink(inode);
	72	unlock_new_inode(inode);
	73	fail:
d70b4f53	74	trace_f2fs_new_inode(inode, err);
531ad7d5	75	make_bad_inode(inode);
57397d86 JK	76	iput(inode);
	77	if (nid_free)
	78	alloc_nid_failed(sbi, ino);
	79	return ERR_PTR(err);
	80	}
	81
	82	static int is_multimedia_file(const unsigned char s, const char sub)
	83	{
9836b8b9 LR	84	size_t slen = strlen(s);
9836b8b9 LR	85	size_t sublen = strlen(sub);
57397d86 JK	86	int ret;
	87
	88	if (sublen > slen)
e66509f0	89	return 0;
57397d86 JK	90
	91	ret = memcmp(s + slen - sublen, sub, sublen);
	92	if (ret) { /* compare upper case */
	93	int i;
	94	char upper_sub[8];
	95	for (i = 0; i < sublen && i < sizeof(upper_sub); i++)
	96	upper_sub[i] = toupper(sub[i]);
e66509f0	97	return !memcmp(s + slen - sublen, upper_sub, sublen);
57397d86 JK	98	}
57397d86 JK	99
e66509f0	100	return !ret;
57397d86 JK	101	}
57397d86 JK	102
0a8165d7	103	/*
57397d86 JK	104	* Set multimedia files as cold files for hot/cold data separation
57397d86 JK	105	*/
953a3e27	106	static inline void set_cold_files(struct f2fs_sb_info sbi, struct inode inode,
57397d86 JK	107	const unsigned char *name)
	108	{
	109	int i;
	110	__u8 (*extlist)[8] = sbi->raw_super->extension_list;
	111
	112	int count = le32_to_cpu(sbi->raw_super->extension_count);
	113	for (i = 0; i < count; i++) {
e66509f0	114	if (is_multimedia_file(name, extlist[i])) {
354a3399	115	file_set_cold(inode);
57397d86 JK	116	break;
	117	}
	118	}
	119	}
	120
	121	static int f2fs_create(struct inode dir, struct dentry dentry, umode_t mode,
	122	bool excl)
	123	{
	124	struct super_block *sb = dir->i_sb;
	125	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	126	struct inode *inode;
	127	nid_t ino = 0;
39936837	128	int err, ilock;
57397d86	129
1efef832 JK	130	f2fs_balance_fs(sbi);
1efef832 JK	131
57397d86 JK	132	inode = f2fs_new_inode(dir, mode);
	133	if (IS_ERR(inode))
	134	return PTR_ERR(inode);
	135
	136	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
953a3e27	137	set_cold_files(sbi, inode, dentry->d_name.name);
57397d86 JK	138
	139	inode->i_op = &f2fs_file_inode_operations;
	140	inode->i_fop = &f2fs_file_operations;
	141	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	142	ino = inode->i_ino;
	143
39936837	144	ilock = mutex_lock_op(sbi);
57397d86	145	err = f2fs_add_link(dentry, inode);
39936837	146	mutex_unlock_op(sbi, ilock);
57397d86 JK	147	if (err)
	148	goto out;
	149
	150	alloc_nid_done(sbi, ino);
	151
0a364af1	152	d_instantiate(dentry, inode);
57397d86	153	unlock_new_inode(inode);
57397d86 JK	154	return 0;
	155	out:
	156	clear_nlink(inode);
	157	unlock_new_inode(inode);
531ad7d5	158	make_bad_inode(inode);
57397d86 JK	159	iput(inode);
	160	alloc_nid_failed(sbi, ino);
	161	return err;
	162	}
	163
	164	static int f2fs_link(struct dentry old_dentry, struct inode dir,
	165	struct dentry *dentry)
	166	{
	167	struct inode *inode = old_dentry->d_inode;
	168	struct super_block *sb = dir->i_sb;
	169	struct f2fs_sb_info *sbi = F2FS_SB(sb);
39936837	170	int err, ilock;
57397d86	171
1efef832 JK	172	f2fs_balance_fs(sbi);
1efef832 JK	173
57397d86	174	inode->i_ctime = CURRENT_TIME;
6f6fd833	175	ihold(inode);
57397d86 JK	176
57397d86 JK	177	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
39936837	178	ilock = mutex_lock_op(sbi);
57397d86	179	err = f2fs_add_link(dentry, inode);
39936837	180	mutex_unlock_op(sbi, ilock);
57397d86 JK	181	if (err)
	182	goto out;
	183
	184	d_instantiate(dentry, inode);
57397d86 JK	185	return 0;
	186	out:
	187	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	188	iput(inode);
	189	return err;
	190	}
	191
	192	struct dentry f2fs_get_parent(struct dentry child)
	193	{
	194	struct qstr dotdot = QSTR_INIT("..", 2);
	195	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	196	if (!ino)
	197	return ERR_PTR(-ENOENT);
	198	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
	199	}
	200
	201	static struct dentry f2fs_lookup(struct inode dir, struct dentry *dentry,
	202	unsigned int flags)
	203	{
	204	struct inode *inode = NULL;
	205	struct f2fs_dir_entry *de;
	206	struct page *page;
	207
5a20d339	208	if (dentry->d_name.len > F2FS_NAME_LEN)
57397d86 JK	209	return ERR_PTR(-ENAMETOOLONG);
	210
	211	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	212	if (de) {
	213	nid_t ino = le32_to_cpu(de->ino);
	214	kunmap(page);
	215	f2fs_put_page(page, 0);
	216
	217	inode = f2fs_iget(dir->i_sb, ino);
	218	if (IS_ERR(inode))
	219	return ERR_CAST(inode);
	220	}
	221
	222	return d_splice_alias(inode, dentry);
	223	}
	224
	225	static int f2fs_unlink(struct inode dir, struct dentry dentry)
	226	{
	227	struct super_block *sb = dir->i_sb;
	228	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	229	struct inode *inode = dentry->d_inode;
	230	struct f2fs_dir_entry *de;
	231	struct page *page;
	232	int err = -ENOENT;
39936837	233	int ilock;
57397d86	234
a2a4a7e4	235	trace_f2fs_unlink_enter(dir, dentry);
1efef832 JK	236	f2fs_balance_fs(sbi);
1efef832 JK	237
57397d86 JK	238	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	239	if (!de)
	240	goto fail;
	241
	242	err = check_orphan_space(sbi);
	243	if (err) {
	244	kunmap(page);
	245	f2fs_put_page(page, 0);
	246	goto fail;
	247	}
	248
39936837	249	ilock = mutex_lock_op(sbi);
57397d86	250	f2fs_delete_entry(de, page, inode);
39936837	251	mutex_unlock_op(sbi, ilock);
57397d86 JK	252
	253	/* In order to evict this inode, we set it dirty */
	254	mark_inode_dirty(inode);
57397d86	255	fail:
a2a4a7e4	256	trace_f2fs_unlink_exit(inode, err);
57397d86 JK	257	return err;
	258	}
	259
	260	static int f2fs_symlink(struct inode dir, struct dentry dentry,
	261	const char *symname)
	262	{
	263	struct super_block *sb = dir->i_sb;
	264	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	265	struct inode *inode;
9836b8b9	266	size_t symlen = strlen(symname) + 1;
39936837	267	int err, ilock;
57397d86	268
1efef832 JK	269	f2fs_balance_fs(sbi);
1efef832 JK	270
57397d86 JK	271	inode = f2fs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	272	if (IS_ERR(inode))
	273	return PTR_ERR(inode);
	274
	275	inode->i_op = &f2fs_symlink_inode_operations;
	276	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	277
39936837	278	ilock = mutex_lock_op(sbi);
57397d86	279	err = f2fs_add_link(dentry, inode);
39936837	280	mutex_unlock_op(sbi, ilock);
57397d86 JK	281	if (err)
	282	goto out;
	283
	284	err = page_symlink(inode, symname, symlen);
	285	alloc_nid_done(sbi, inode->i_ino);
	286
	287	d_instantiate(dentry, inode);
	288	unlock_new_inode(inode);
57397d86 JK	289	return err;
	290	out:
	291	clear_nlink(inode);
	292	unlock_new_inode(inode);
531ad7d5	293	make_bad_inode(inode);
57397d86 JK	294	iput(inode);
	295	alloc_nid_failed(sbi, inode->i_ino);
	296	return err;
	297	}
	298
	299	static int f2fs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	300	{
	301	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	302	struct inode *inode;
39936837	303	int err, ilock;
57397d86	304
1efef832 JK	305	f2fs_balance_fs(sbi);
1efef832 JK	306
57397d86	307	inode = f2fs_new_inode(dir, S_IFDIR \| mode);
57397d86	308	if (IS_ERR(inode))
61412b64	309	return PTR_ERR(inode);
57397d86 JK	310
	311	inode->i_op = &f2fs_dir_inode_operations;
	312	inode->i_fop = &f2fs_dir_operations;
	313	inode->i_mapping->a_ops = &f2fs_dblock_aops;
a0d42539	314	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
57397d86 JK	315
57397d86 JK	316	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
39936837	317	ilock = mutex_lock_op(sbi);
57397d86	318	err = f2fs_add_link(dentry, inode);
39936837	319	mutex_unlock_op(sbi, ilock);
57397d86 JK	320	if (err)
	321	goto out_fail;
	322
	323	alloc_nid_done(sbi, inode->i_ino);
	324
	325	d_instantiate(dentry, inode);
	326	unlock_new_inode(inode);
	327
57397d86 JK	328	return 0;
	329
	330	out_fail:
	331	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	332	clear_nlink(inode);
	333	unlock_new_inode(inode);
531ad7d5	334	make_bad_inode(inode);
57397d86 JK	335	iput(inode);
	336	alloc_nid_failed(sbi, inode->i_ino);
	337	return err;
	338	}
	339
	340	static int f2fs_rmdir(struct inode dir, struct dentry dentry)
	341	{
	342	struct inode *inode = dentry->d_inode;
	343	if (f2fs_empty_dir(inode))
	344	return f2fs_unlink(dir, dentry);
	345	return -ENOTEMPTY;
	346	}
	347
	348	static int f2fs_mknod(struct inode dir, struct dentry dentry,
	349	umode_t mode, dev_t rdev)
	350	{
	351	struct super_block *sb = dir->i_sb;
	352	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	353	struct inode *inode;
	354	int err = 0;
39936837	355	int ilock;
57397d86 JK	356
	357	if (!new_valid_dev(rdev))
	358	return -EINVAL;
	359
1efef832 JK	360	f2fs_balance_fs(sbi);
1efef832 JK	361
57397d86 JK	362	inode = f2fs_new_inode(dir, mode);
	363	if (IS_ERR(inode))
	364	return PTR_ERR(inode);
	365
	366	init_special_inode(inode, inode->i_mode, rdev);
	367	inode->i_op = &f2fs_special_inode_operations;
	368
39936837	369	ilock = mutex_lock_op(sbi);
57397d86	370	err = f2fs_add_link(dentry, inode);
39936837	371	mutex_unlock_op(sbi, ilock);
57397d86 JK	372	if (err)
	373	goto out;
	374
	375	alloc_nid_done(sbi, inode->i_ino);
	376	d_instantiate(dentry, inode);
	377	unlock_new_inode(inode);
57397d86 JK	378	return 0;
	379	out:
	380	clear_nlink(inode);
	381	unlock_new_inode(inode);
531ad7d5	382	make_bad_inode(inode);
57397d86 JK	383	iput(inode);
	384	alloc_nid_failed(sbi, inode->i_ino);
	385	return err;
	386	}
	387
	388	static int f2fs_rename(struct inode old_dir, struct dentry old_dentry,
	389	struct inode new_dir, struct dentry new_dentry)
	390	{
	391	struct super_block *sb = old_dir->i_sb;
	392	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	393	struct inode *old_inode = old_dentry->d_inode;
	394	struct inode *new_inode = new_dentry->d_inode;
	395	struct page *old_dir_page;
	396	struct page *old_page;
	397	struct f2fs_dir_entry *old_dir_entry = NULL;
	398	struct f2fs_dir_entry *old_entry;
	399	struct f2fs_dir_entry *new_entry;
39936837	400	int err = -ENOENT, ilock = -1;
57397d86	401
1efef832 JK	402	f2fs_balance_fs(sbi);
1efef832 JK	403
57397d86 JK	404	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	405	if (!old_entry)
	406	goto out;
	407
	408	if (S_ISDIR(old_inode->i_mode)) {
	409	err = -EIO;
	410	old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
	411	if (!old_dir_entry)
	412	goto out_old;
	413	}
	414
39936837	415	ilock = mutex_lock_op(sbi);
57397d86 JK	416
	417	if (new_inode) {
	418	struct page *new_page;
	419
	420	err = -ENOTEMPTY;
	421	if (old_dir_entry && !f2fs_empty_dir(new_inode))
	422	goto out_dir;
	423
	424	err = -ENOENT;
	425	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
	426	&new_page);
	427	if (!new_entry)
	428	goto out_dir;
	429
1cd14caf JK	430	if (update_dent_inode(old_inode, &new_dentry->d_name)) {
	431	f2fs_put_page(new_page, 1);
	432	goto out_dir;
	433	}
	434
57397d86 JK	435	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
	436
	437	new_inode->i_ctime = CURRENT_TIME;
	438	if (old_dir_entry)
	439	drop_nlink(new_inode);
	440	drop_nlink(new_inode);
	441	if (!new_inode->i_nlink)
	442	add_orphan_inode(sbi, new_inode->i_ino);
39936837	443	update_inode_page(new_inode);
57397d86 JK	444	} else {
	445	err = f2fs_add_link(new_dentry, old_inode);
	446	if (err)
	447	goto out_dir;
	448
	449	if (old_dir_entry) {
	450	inc_nlink(new_dir);
39936837	451	update_inode_page(new_dir);
57397d86 JK	452	}
	453	}
	454
	455	old_inode->i_ctime = CURRENT_TIME;
57397d86 JK	456	mark_inode_dirty(old_inode);
	457
	458	f2fs_delete_entry(old_entry, old_page, NULL);
	459
	460	if (old_dir_entry) {
	461	if (old_dir != new_dir) {
	462	f2fs_set_link(old_inode, old_dir_entry,
	463	old_dir_page, new_dir);
	464	} else {
	465	kunmap(old_dir_page);
	466	f2fs_put_page(old_dir_page, 0);
	467	}
	468	drop_nlink(old_dir);
39936837	469	update_inode_page(old_dir);
57397d86 JK	470	}
57397d86 JK	471
39936837	472	mutex_unlock_op(sbi, ilock);
57397d86 JK	473	return 0;
	474
	475	out_dir:
	476	if (old_dir_entry) {
	477	kunmap(old_dir_page);
	478	f2fs_put_page(old_dir_page, 0);
	479	}
39936837	480	mutex_unlock_op(sbi, ilock);
57397d86 JK	481	out_old:
	482	kunmap(old_page);
	483	f2fs_put_page(old_page, 0);
	484	out:
	485	return err;
	486	}
	487
	488	const struct inode_operations f2fs_dir_inode_operations = {
	489	.create = f2fs_create,
	490	.lookup = f2fs_lookup,
	491	.link = f2fs_link,
	492	.unlink = f2fs_unlink,
	493	.symlink = f2fs_symlink,
	494	.mkdir = f2fs_mkdir,
	495	.rmdir = f2fs_rmdir,
	496	.mknod = f2fs_mknod,
	497	.rename = f2fs_rename,
2d4d9fb5	498	.getattr = f2fs_getattr,
57397d86 JK	499	.setattr = f2fs_setattr,
	500	.get_acl = f2fs_get_acl,
	501	#ifdef CONFIG_F2FS_FS_XATTR
	502	.setxattr = generic_setxattr,
	503	.getxattr = generic_getxattr,
	504	.listxattr = f2fs_listxattr,
	505	.removexattr = generic_removexattr,
	506	#endif
	507	};
	508
	509	const struct inode_operations f2fs_symlink_inode_operations = {
	510	.readlink = generic_readlink,
	511	.follow_link = page_follow_link_light,
	512	.put_link = page_put_link,
2d4d9fb5	513	.getattr = f2fs_getattr,
57397d86 JK	514	.setattr = f2fs_setattr,
	515	#ifdef CONFIG_F2FS_FS_XATTR
	516	.setxattr = generic_setxattr,
	517	.getxattr = generic_getxattr,
	518	.listxattr = f2fs_listxattr,
	519	.removexattr = generic_removexattr,
	520	#endif
	521	};
	522
	523	const struct inode_operations f2fs_special_inode_operations = {
2d4d9fb5	524	.getattr = f2fs_getattr,
57397d86 JK	525	.setattr = f2fs_setattr,
	526	.get_acl = f2fs_get_acl,
	527	#ifdef CONFIG_F2FS_FS_XATTR
	528	.setxattr = generic_setxattr,
	529	.getxattr = generic_getxattr,
	530	.listxattr = f2fs_listxattr,
	531	.removexattr = generic_removexattr,
	532	#endif
	533	};