[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;

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

	f2fs_lock_op(sbi);
	if (!alloc_nid(sbi, &ino)) {
		f2fs_unlock_op(sbi);
		err = -ENOSPC;
		goto fail;
	}
	f2fs_unlock_op(sbi);

	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);

	if (sublen > slen)
		return 0;

	return !strncasecmp(s + slen - sublen, sub, sublen);
}

/*
 * 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;

	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;

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	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;

	f2fs_balance_fs(sbi);

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

	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	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;

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

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

	f2fs_lock_op(sbi);
	err = acquire_orphan_inode(sbi);
	if (err) {
		f2fs_unlock_op(sbi);
		kunmap(page);
		f2fs_put_page(page, 0);
		goto fail;
	}
	f2fs_delete_entry(de, page, inode);
	f2fs_unlock_op(sbi);

	/* 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;

	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;

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	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;

	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);
	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	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;

	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;

	f2fs_lock_op(sbi);
	err = f2fs_add_link(dentry, inode);
	f2fs_unlock_op(sbi);
	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, *new_page;
	struct f2fs_dir_entry *old_dir_entry = NULL;
	struct f2fs_dir_entry *old_entry;
	struct f2fs_dir_entry *new_entry;
	int err = -ENOENT;

	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;
	}

	f2fs_lock_op(sbi);

	if (new_inode) {

		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;

		err = acquire_orphan_inode(sbi);
		if (err)
			goto put_out_dir;

		if (update_dent_inode(old_inode, &new_dentry->d_name)) {
			release_orphan_inode(sbi);
			goto put_out_dir;
		}

		f2fs_set_link(new_dir, new_entry, new_page, old_inode);
		down_write(&F2FS_I(old_inode)->i_sem);
		F2FS_I(old_inode)->i_pino = new_dir->i_ino;
		up_write(&F2FS_I(old_inode)->i_sem);

		new_inode->i_ctime = CURRENT_TIME;
		down_write(&F2FS_I(new_inode)->i_sem);
		if (old_dir_entry)
			drop_nlink(new_inode);
		drop_nlink(new_inode);
		up_write(&F2FS_I(new_inode)->i_sem);

		mark_inode_dirty(new_inode);

		if (!new_inode->i_nlink)
			add_orphan_inode(sbi, new_inode->i_ino);
		else
			release_orphan_inode(sbi);

		update_inode_page(old_inode);
		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);
			down_write(&F2FS_I(old_inode)->i_sem);
			F2FS_I(old_inode)->i_pino = new_dir->i_ino;
			up_write(&F2FS_I(old_inode)->i_sem);
			update_inode_page(old_inode);
		} else {
			kunmap(old_dir_page);
			f2fs_put_page(old_dir_page, 0);
		}
		drop_nlink(old_dir);
		mark_inode_dirty(old_dir);
		update_inode_page(old_dir);
	}

	f2fs_unlock_op(sbi);
	return 0;

put_out_dir:
	f2fs_put_page(new_page, 1);
out_dir:
	if (old_dir_entry) {
		kunmap(old_dir_page);
		f2fs_put_page(old_dir_page, 0);
	}
	f2fs_unlock_op(sbi);
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,
	.set_acl	= f2fs_set_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,
	.set_acl	= f2fs_set_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;
e479556b	30	int err;
57397d86 JK	31
	32	inode = new_inode(sb);
	33	if (!inode)
	34	return ERR_PTR(-ENOMEM);
	35
e479556b	36	f2fs_lock_op(sbi);
57397d86	37	if (!alloc_nid(sbi, &ino)) {
e479556b	38	f2fs_unlock_op(sbi);
57397d86 JK	39	err = -ENOSPC;
	40	goto fail;
	41	}
e479556b	42	f2fs_unlock_op(sbi);
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
57397d86 JK	87	if (sublen > slen)
e66509f0	88	return 0;
57397d86	89
749ebfd1	90	return !strncasecmp(s + slen - sublen, sub, sublen);
57397d86 JK	91	}
57397d86 JK	92
0a8165d7	93	/*
57397d86 JK	94	* Set multimedia files as cold files for hot/cold data separation
57397d86 JK	95	*/
953a3e27	96	static inline void set_cold_files(struct f2fs_sb_info sbi, struct inode inode,
57397d86 JK	97	const unsigned char *name)
	98	{
	99	int i;
	100	__u8 (*extlist)[8] = sbi->raw_super->extension_list;
	101
	102	int count = le32_to_cpu(sbi->raw_super->extension_count);
	103	for (i = 0; i < count; i++) {
e66509f0	104	if (is_multimedia_file(name, extlist[i])) {
354a3399	105	file_set_cold(inode);
57397d86 JK	106	break;
	107	}
	108	}
	109	}
	110
	111	static int f2fs_create(struct inode dir, struct dentry dentry, umode_t mode,
	112	bool excl)
	113	{
	114	struct super_block *sb = dir->i_sb;
	115	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	116	struct inode *inode;
	117	nid_t ino = 0;
e479556b	118	int err;
57397d86	119
1efef832 JK	120	f2fs_balance_fs(sbi);
1efef832 JK	121
57397d86 JK	122	inode = f2fs_new_inode(dir, mode);
	123	if (IS_ERR(inode))
	124	return PTR_ERR(inode);
	125
	126	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
953a3e27	127	set_cold_files(sbi, inode, dentry->d_name.name);
57397d86 JK	128
	129	inode->i_op = &f2fs_file_inode_operations;
	130	inode->i_fop = &f2fs_file_operations;
	131	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	132	ino = inode->i_ino;
	133
e479556b	134	f2fs_lock_op(sbi);
57397d86	135	err = f2fs_add_link(dentry, inode);
e479556b	136	f2fs_unlock_op(sbi);
57397d86 JK	137	if (err)
	138	goto out;
	139
	140	alloc_nid_done(sbi, ino);
	141
0a364af1	142	d_instantiate(dentry, inode);
57397d86	143	unlock_new_inode(inode);
57397d86 JK	144	return 0;
	145	out:
	146	clear_nlink(inode);
	147	unlock_new_inode(inode);
531ad7d5	148	make_bad_inode(inode);
57397d86 JK	149	iput(inode);
	150	alloc_nid_failed(sbi, ino);
	151	return err;
	152	}
	153
	154	static int f2fs_link(struct dentry old_dentry, struct inode dir,
	155	struct dentry *dentry)
	156	{
	157	struct inode *inode = old_dentry->d_inode;
	158	struct super_block *sb = dir->i_sb;
	159	struct f2fs_sb_info *sbi = F2FS_SB(sb);
e479556b	160	int err;
57397d86	161
1efef832 JK	162	f2fs_balance_fs(sbi);
1efef832 JK	163
57397d86	164	inode->i_ctime = CURRENT_TIME;
6f6fd833	165	ihold(inode);
57397d86 JK	166
57397d86 JK	167	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
e479556b	168	f2fs_lock_op(sbi);
57397d86	169	err = f2fs_add_link(dentry, inode);
e479556b	170	f2fs_unlock_op(sbi);
57397d86 JK	171	if (err)
	172	goto out;
	173
	174	d_instantiate(dentry, inode);
57397d86 JK	175	return 0;
	176	out:
	177	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	178	iput(inode);
	179	return err;
	180	}
	181
	182	struct dentry f2fs_get_parent(struct dentry child)
	183	{
	184	struct qstr dotdot = QSTR_INIT("..", 2);
	185	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	186	if (!ino)
	187	return ERR_PTR(-ENOENT);
	188	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
	189	}
	190
	191	static struct dentry f2fs_lookup(struct inode dir, struct dentry *dentry,
	192	unsigned int flags)
	193	{
	194	struct inode *inode = NULL;
	195	struct f2fs_dir_entry *de;
	196	struct page *page;
	197
5a20d339	198	if (dentry->d_name.len > F2FS_NAME_LEN)
57397d86 JK	199	return ERR_PTR(-ENAMETOOLONG);
	200
	201	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	202	if (de) {
	203	nid_t ino = le32_to_cpu(de->ino);
	204	kunmap(page);
	205	f2fs_put_page(page, 0);
	206
	207	inode = f2fs_iget(dir->i_sb, ino);
	208	if (IS_ERR(inode))
	209	return ERR_CAST(inode);
	210	}
	211
	212	return d_splice_alias(inode, dentry);
	213	}
	214
	215	static int f2fs_unlink(struct inode dir, struct dentry dentry)
	216	{
	217	struct super_block *sb = dir->i_sb;
	218	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	219	struct inode *inode = dentry->d_inode;
	220	struct f2fs_dir_entry *de;
	221	struct page *page;
	222	int err = -ENOENT;
	223
a2a4a7e4	224	trace_f2fs_unlink_enter(dir, dentry);
1efef832 JK	225	f2fs_balance_fs(sbi);
1efef832 JK	226
57397d86 JK	227	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	228	if (!de)
	229	goto fail;
	230
ccaaca25	231	f2fs_lock_op(sbi);
cbd56e7d	232	err = acquire_orphan_inode(sbi);
57397d86	233	if (err) {
ccaaca25	234	f2fs_unlock_op(sbi);
57397d86 JK	235	kunmap(page);
	236	f2fs_put_page(page, 0);
	237	goto fail;
	238	}
57397d86	239	f2fs_delete_entry(de, page, inode);
e479556b	240	f2fs_unlock_op(sbi);
57397d86 JK	241
	242	/* In order to evict this inode, we set it dirty */
	243	mark_inode_dirty(inode);
57397d86	244	fail:
a2a4a7e4	245	trace_f2fs_unlink_exit(inode, err);
57397d86 JK	246	return err;
	247	}
	248
	249	static int f2fs_symlink(struct inode dir, struct dentry dentry,
	250	const char *symname)
	251	{
	252	struct super_block *sb = dir->i_sb;
	253	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	254	struct inode *inode;
9836b8b9	255	size_t symlen = strlen(symname) + 1;
e479556b	256	int err;
57397d86	257
1efef832 JK	258	f2fs_balance_fs(sbi);
1efef832 JK	259
57397d86 JK	260	inode = f2fs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	261	if (IS_ERR(inode))
	262	return PTR_ERR(inode);
	263
	264	inode->i_op = &f2fs_symlink_inode_operations;
	265	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	266
e479556b	267	f2fs_lock_op(sbi);
57397d86	268	err = f2fs_add_link(dentry, inode);
e479556b	269	f2fs_unlock_op(sbi);
57397d86 JK	270	if (err)
	271	goto out;
	272
	273	err = page_symlink(inode, symname, symlen);
	274	alloc_nid_done(sbi, inode->i_ino);
	275
	276	d_instantiate(dentry, inode);
	277	unlock_new_inode(inode);
57397d86 JK	278	return err;
	279	out:
	280	clear_nlink(inode);
	281	unlock_new_inode(inode);
531ad7d5	282	make_bad_inode(inode);
57397d86 JK	283	iput(inode);
	284	alloc_nid_failed(sbi, inode->i_ino);
	285	return err;
	286	}
	287
	288	static int f2fs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	289	{
	290	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	291	struct inode *inode;
e479556b	292	int err;
57397d86	293
1efef832 JK	294	f2fs_balance_fs(sbi);
1efef832 JK	295
57397d86	296	inode = f2fs_new_inode(dir, S_IFDIR \| mode);
57397d86	297	if (IS_ERR(inode))
61412b64	298	return PTR_ERR(inode);
57397d86 JK	299
	300	inode->i_op = &f2fs_dir_inode_operations;
	301	inode->i_fop = &f2fs_dir_operations;
	302	inode->i_mapping->a_ops = &f2fs_dblock_aops;
a0d42539	303	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
57397d86 JK	304
57397d86 JK	305	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
e479556b	306	f2fs_lock_op(sbi);
57397d86	307	err = f2fs_add_link(dentry, inode);
e479556b	308	f2fs_unlock_op(sbi);
57397d86 JK	309	if (err)
	310	goto out_fail;
	311
	312	alloc_nid_done(sbi, inode->i_ino);
	313
	314	d_instantiate(dentry, inode);
	315	unlock_new_inode(inode);
	316
57397d86 JK	317	return 0;
	318
	319	out_fail:
	320	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	321	clear_nlink(inode);
	322	unlock_new_inode(inode);
531ad7d5	323	make_bad_inode(inode);
57397d86 JK	324	iput(inode);
	325	alloc_nid_failed(sbi, inode->i_ino);
	326	return err;
	327	}
	328
	329	static int f2fs_rmdir(struct inode dir, struct dentry dentry)
	330	{
	331	struct inode *inode = dentry->d_inode;
	332	if (f2fs_empty_dir(inode))
	333	return f2fs_unlink(dir, dentry);
	334	return -ENOTEMPTY;
	335	}
	336
	337	static int f2fs_mknod(struct inode dir, struct dentry dentry,
	338	umode_t mode, dev_t rdev)
	339	{
	340	struct super_block *sb = dir->i_sb;
	341	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	342	struct inode *inode;
	343	int err = 0;
	344
	345	if (!new_valid_dev(rdev))
	346	return -EINVAL;
	347
1efef832 JK	348	f2fs_balance_fs(sbi);
1efef832 JK	349
57397d86 JK	350	inode = f2fs_new_inode(dir, mode);
	351	if (IS_ERR(inode))
	352	return PTR_ERR(inode);
	353
	354	init_special_inode(inode, inode->i_mode, rdev);
	355	inode->i_op = &f2fs_special_inode_operations;
	356
e479556b	357	f2fs_lock_op(sbi);
57397d86	358	err = f2fs_add_link(dentry, inode);
e479556b	359	f2fs_unlock_op(sbi);
57397d86 JK	360	if (err)
	361	goto out;
	362
	363	alloc_nid_done(sbi, inode->i_ino);
	364	d_instantiate(dentry, inode);
	365	unlock_new_inode(inode);
57397d86 JK	366	return 0;
	367	out:
	368	clear_nlink(inode);
	369	unlock_new_inode(inode);
531ad7d5	370	make_bad_inode(inode);
57397d86 JK	371	iput(inode);
	372	alloc_nid_failed(sbi, inode->i_ino);
	373	return err;
	374	}
	375
	376	static int f2fs_rename(struct inode old_dir, struct dentry old_dentry,
	377	struct inode new_dir, struct dentry new_dentry)
	378	{
	379	struct super_block *sb = old_dir->i_sb;
	380	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	381	struct inode *old_inode = old_dentry->d_inode;
	382	struct inode *new_inode = new_dentry->d_inode;
	383	struct page *old_dir_page;
cbd56e7d	384	struct page old_page, new_page;
57397d86 JK	385	struct f2fs_dir_entry *old_dir_entry = NULL;
	386	struct f2fs_dir_entry *old_entry;
	387	struct f2fs_dir_entry *new_entry;
e479556b	388	int err = -ENOENT;
57397d86	389
1efef832 JK	390	f2fs_balance_fs(sbi);
1efef832 JK	391
57397d86 JK	392	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	393	if (!old_entry)
	394	goto out;
	395
	396	if (S_ISDIR(old_inode->i_mode)) {
	397	err = -EIO;
	398	old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
	399	if (!old_dir_entry)
	400	goto out_old;
	401	}
	402
e479556b	403	f2fs_lock_op(sbi);
57397d86 JK	404
57397d86 JK	405	if (new_inode) {
57397d86 JK	406
	407	err = -ENOTEMPTY;
	408	if (old_dir_entry && !f2fs_empty_dir(new_inode))
	409	goto out_dir;
	410
	411	err = -ENOENT;
	412	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
	413	&new_page);
	414	if (!new_entry)
	415	goto out_dir;
	416
cbd56e7d JK	417	err = acquire_orphan_inode(sbi);
	418	if (err)
	419	goto put_out_dir;
	420
1cd14caf	421	if (update_dent_inode(old_inode, &new_dentry->d_name)) {
cbd56e7d JK	422	release_orphan_inode(sbi);
cbd56e7d JK	423	goto put_out_dir;
1cd14caf JK	424	}
1cd14caf JK	425
57397d86	426	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
d928bfbf	427	down_write(&F2FS_I(old_inode)->i_sem);
deead090	428	F2FS_I(old_inode)->i_pino = new_dir->i_ino;
d928bfbf	429	up_write(&F2FS_I(old_inode)->i_sem);
57397d86 JK	430
57397d86 JK	431	new_inode->i_ctime = CURRENT_TIME;
d928bfbf	432	down_write(&F2FS_I(new_inode)->i_sem);
57397d86 JK	433	if (old_dir_entry)
	434	drop_nlink(new_inode);
	435	drop_nlink(new_inode);
d928bfbf JK	436	up_write(&F2FS_I(new_inode)->i_sem);
d928bfbf JK	437
a18ff063	438	mark_inode_dirty(new_inode);
cbd56e7d	439
57397d86 JK	440	if (!new_inode->i_nlink)
57397d86 JK	441	add_orphan_inode(sbi, new_inode->i_ino);
cbd56e7d JK	442	else
	443	release_orphan_inode(sbi);
	444
8cb82688	445	update_inode_page(old_inode);
39936837	446	update_inode_page(new_inode);
57397d86 JK	447	} else {
	448	err = f2fs_add_link(new_dentry, old_inode);
	449	if (err)
	450	goto out_dir;
	451
	452	if (old_dir_entry) {
	453	inc_nlink(new_dir);
39936837	454	update_inode_page(new_dir);
57397d86 JK	455	}
	456	}
	457
	458	old_inode->i_ctime = CURRENT_TIME;
57397d86 JK	459	mark_inode_dirty(old_inode);
	460
	461	f2fs_delete_entry(old_entry, old_page, NULL);
	462
	463	if (old_dir_entry) {
	464	if (old_dir != new_dir) {
	465	f2fs_set_link(old_inode, old_dir_entry,
	466	old_dir_page, new_dir);
d928bfbf	467	down_write(&F2FS_I(old_inode)->i_sem);
deead090	468	F2FS_I(old_inode)->i_pino = new_dir->i_ino;
d928bfbf	469	up_write(&F2FS_I(old_inode)->i_sem);
a18ff063	470	update_inode_page(old_inode);
57397d86 JK	471	} else {
	472	kunmap(old_dir_page);
	473	f2fs_put_page(old_dir_page, 0);
	474	}
	475	drop_nlink(old_dir);
a18ff063	476	mark_inode_dirty(old_dir);
39936837	477	update_inode_page(old_dir);
57397d86 JK	478	}
57397d86 JK	479
e479556b	480	f2fs_unlock_op(sbi);
57397d86 JK	481	return 0;
57397d86 JK	482
cbd56e7d JK	483	put_out_dir:
cbd56e7d JK	484	f2fs_put_page(new_page, 1);
57397d86 JK	485	out_dir:
	486	if (old_dir_entry) {
	487	kunmap(old_dir_page);
	488	f2fs_put_page(old_dir_page, 0);
	489	}
e479556b	490	f2fs_unlock_op(sbi);
57397d86 JK	491	out_old:
	492	kunmap(old_page);
	493	f2fs_put_page(old_page, 0);
	494	out:
	495	return err;
	496	}
	497
	498	const struct inode_operations f2fs_dir_inode_operations = {
	499	.create = f2fs_create,
	500	.lookup = f2fs_lookup,
	501	.link = f2fs_link,
	502	.unlink = f2fs_unlink,
	503	.symlink = f2fs_symlink,
	504	.mkdir = f2fs_mkdir,
	505	.rmdir = f2fs_rmdir,
	506	.mknod = f2fs_mknod,
	507	.rename = f2fs_rename,
2d4d9fb5	508	.getattr = f2fs_getattr,
57397d86 JK	509	.setattr = f2fs_setattr,
57397d86 JK	510	.get_acl = f2fs_get_acl,
a6dda0e6	511	.set_acl = f2fs_set_acl,
57397d86 JK	512	#ifdef CONFIG_F2FS_FS_XATTR
	513	.setxattr = generic_setxattr,
	514	.getxattr = generic_getxattr,
	515	.listxattr = f2fs_listxattr,
	516	.removexattr = generic_removexattr,
	517	#endif
	518	};
	519
	520	const struct inode_operations f2fs_symlink_inode_operations = {
	521	.readlink = generic_readlink,
	522	.follow_link = page_follow_link_light,
	523	.put_link = page_put_link,
2d4d9fb5	524	.getattr = f2fs_getattr,
57397d86 JK	525	.setattr = f2fs_setattr,
	526	#ifdef CONFIG_F2FS_FS_XATTR
	527	.setxattr = generic_setxattr,
	528	.getxattr = generic_getxattr,
	529	.listxattr = f2fs_listxattr,
	530	.removexattr = generic_removexattr,
	531	#endif
	532	};
	533
	534	const struct inode_operations f2fs_special_inode_operations = {
2d4d9fb5	535	.getattr = f2fs_getattr,
57397d86 JK	536	.setattr = f2fs_setattr,
57397d86 JK	537	.get_acl = f2fs_get_acl,
a6dda0e6	538	.set_acl = f2fs_set_acl,
57397d86 JK	539	#ifdef CONFIG_F2FS_FS_XATTR
	540	.setxattr = generic_setxattr,
	541	.getxattr = generic_getxattr,
	542	.listxattr = f2fs_listxattr,
	543	.removexattr = generic_removexattr,
	544	#endif
	545	};