[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);

	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, 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 = acquire_orphan_inode(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, *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, 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) {

		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);

		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);
		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);
		} 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;

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);
	}
	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
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;
39936837	118	int err, ilock;
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
39936837	134	ilock = mutex_lock_op(sbi);
57397d86	135	err = f2fs_add_link(dentry, inode);
39936837	136	mutex_unlock_op(sbi, ilock);
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);
39936837	160	int err, ilock;
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);
39936837	168	ilock = mutex_lock_op(sbi);
57397d86	169	err = f2fs_add_link(dentry, inode);
39936837	170	mutex_unlock_op(sbi, ilock);
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;
39936837	223	int ilock;
57397d86	224
a2a4a7e4	225	trace_f2fs_unlink_enter(dir, dentry);
1efef832 JK	226	f2fs_balance_fs(sbi);
1efef832 JK	227
57397d86 JK	228	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	229	if (!de)
	230	goto fail;
	231
cbd56e7d	232	err = acquire_orphan_inode(sbi);
57397d86 JK	233	if (err) {
	234	kunmap(page);
	235	f2fs_put_page(page, 0);
	236	goto fail;
	237	}
	238
39936837	239	ilock = mutex_lock_op(sbi);
57397d86	240	f2fs_delete_entry(de, page, inode);
39936837	241	mutex_unlock_op(sbi, ilock);
57397d86 JK	242
	243	/* In order to evict this inode, we set it dirty */
	244	mark_inode_dirty(inode);
57397d86	245	fail:
a2a4a7e4	246	trace_f2fs_unlink_exit(inode, err);
57397d86 JK	247	return err;
	248	}
	249
	250	static int f2fs_symlink(struct inode dir, struct dentry dentry,
	251	const char *symname)
	252	{
	253	struct super_block *sb = dir->i_sb;
	254	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	255	struct inode *inode;
9836b8b9	256	size_t symlen = strlen(symname) + 1;
39936837	257	int err, ilock;
57397d86	258
1efef832 JK	259	f2fs_balance_fs(sbi);
1efef832 JK	260
57397d86 JK	261	inode = f2fs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	262	if (IS_ERR(inode))
	263	return PTR_ERR(inode);
	264
	265	inode->i_op = &f2fs_symlink_inode_operations;
	266	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	267
39936837	268	ilock = mutex_lock_op(sbi);
57397d86	269	err = f2fs_add_link(dentry, inode);
39936837	270	mutex_unlock_op(sbi, ilock);
57397d86 JK	271	if (err)
	272	goto out;
	273
	274	err = page_symlink(inode, symname, symlen);
	275	alloc_nid_done(sbi, inode->i_ino);
	276
	277	d_instantiate(dentry, inode);
	278	unlock_new_inode(inode);
57397d86 JK	279	return err;
	280	out:
	281	clear_nlink(inode);
	282	unlock_new_inode(inode);
531ad7d5	283	make_bad_inode(inode);
57397d86 JK	284	iput(inode);
	285	alloc_nid_failed(sbi, inode->i_ino);
	286	return err;
	287	}
	288
	289	static int f2fs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	290	{
	291	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	292	struct inode *inode;
39936837	293	int err, ilock;
57397d86	294
1efef832 JK	295	f2fs_balance_fs(sbi);
1efef832 JK	296
57397d86	297	inode = f2fs_new_inode(dir, S_IFDIR \| mode);
57397d86	298	if (IS_ERR(inode))
61412b64	299	return PTR_ERR(inode);
57397d86 JK	300
	301	inode->i_op = &f2fs_dir_inode_operations;
	302	inode->i_fop = &f2fs_dir_operations;
	303	inode->i_mapping->a_ops = &f2fs_dblock_aops;
a0d42539	304	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
57397d86 JK	305
57397d86 JK	306	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
39936837	307	ilock = mutex_lock_op(sbi);
57397d86	308	err = f2fs_add_link(dentry, inode);
39936837	309	mutex_unlock_op(sbi, ilock);
57397d86 JK	310	if (err)
	311	goto out_fail;
	312
	313	alloc_nid_done(sbi, inode->i_ino);
	314
	315	d_instantiate(dentry, inode);
	316	unlock_new_inode(inode);
	317
57397d86 JK	318	return 0;
	319
	320	out_fail:
	321	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	322	clear_nlink(inode);
	323	unlock_new_inode(inode);
531ad7d5	324	make_bad_inode(inode);
57397d86 JK	325	iput(inode);
	326	alloc_nid_failed(sbi, inode->i_ino);
	327	return err;
	328	}
	329
	330	static int f2fs_rmdir(struct inode dir, struct dentry dentry)
	331	{
	332	struct inode *inode = dentry->d_inode;
	333	if (f2fs_empty_dir(inode))
	334	return f2fs_unlink(dir, dentry);
	335	return -ENOTEMPTY;
	336	}
	337
	338	static int f2fs_mknod(struct inode dir, struct dentry dentry,
	339	umode_t mode, dev_t rdev)
	340	{
	341	struct super_block *sb = dir->i_sb;
	342	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	343	struct inode *inode;
	344	int err = 0;
39936837	345	int ilock;
57397d86 JK	346
	347	if (!new_valid_dev(rdev))
	348	return -EINVAL;
	349
1efef832 JK	350	f2fs_balance_fs(sbi);
1efef832 JK	351
57397d86 JK	352	inode = f2fs_new_inode(dir, mode);
	353	if (IS_ERR(inode))
	354	return PTR_ERR(inode);
	355
	356	init_special_inode(inode, inode->i_mode, rdev);
	357	inode->i_op = &f2fs_special_inode_operations;
	358
39936837	359	ilock = mutex_lock_op(sbi);
57397d86	360	err = f2fs_add_link(dentry, inode);
39936837	361	mutex_unlock_op(sbi, ilock);
57397d86 JK	362	if (err)
	363	goto out;
	364
	365	alloc_nid_done(sbi, inode->i_ino);
	366	d_instantiate(dentry, inode);
	367	unlock_new_inode(inode);
57397d86 JK	368	return 0;
	369	out:
	370	clear_nlink(inode);
	371	unlock_new_inode(inode);
531ad7d5	372	make_bad_inode(inode);
57397d86 JK	373	iput(inode);
	374	alloc_nid_failed(sbi, inode->i_ino);
	375	return err;
	376	}
	377
	378	static int f2fs_rename(struct inode old_dir, struct dentry old_dentry,
	379	struct inode new_dir, struct dentry new_dentry)
	380	{
	381	struct super_block *sb = old_dir->i_sb;
	382	struct f2fs_sb_info *sbi = F2FS_SB(sb);
	383	struct inode *old_inode = old_dentry->d_inode;
	384	struct inode *new_inode = new_dentry->d_inode;
	385	struct page *old_dir_page;
cbd56e7d	386	struct page old_page, new_page;
57397d86 JK	387	struct f2fs_dir_entry *old_dir_entry = NULL;
	388	struct f2fs_dir_entry *old_entry;
	389	struct f2fs_dir_entry *new_entry;
39936837	390	int err = -ENOENT, ilock = -1;
57397d86	391
1efef832 JK	392	f2fs_balance_fs(sbi);
1efef832 JK	393
57397d86 JK	394	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	395	if (!old_entry)
	396	goto out;
	397
	398	if (S_ISDIR(old_inode->i_mode)) {
	399	err = -EIO;
	400	old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
	401	if (!old_dir_entry)
	402	goto out_old;
	403	}
	404
39936837	405	ilock = mutex_lock_op(sbi);
57397d86 JK	406
57397d86 JK	407	if (new_inode) {
57397d86 JK	408
	409	err = -ENOTEMPTY;
	410	if (old_dir_entry && !f2fs_empty_dir(new_inode))
	411	goto out_dir;
	412
	413	err = -ENOENT;
	414	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
	415	&new_page);
	416	if (!new_entry)
	417	goto out_dir;
	418
cbd56e7d JK	419	err = acquire_orphan_inode(sbi);
	420	if (err)
	421	goto put_out_dir;
	422
1cd14caf	423	if (update_dent_inode(old_inode, &new_dentry->d_name)) {
cbd56e7d JK	424	release_orphan_inode(sbi);
cbd56e7d JK	425	goto put_out_dir;
1cd14caf JK	426	}
1cd14caf JK	427
57397d86 JK	428	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
	429
	430	new_inode->i_ctime = CURRENT_TIME;
	431	if (old_dir_entry)
	432	drop_nlink(new_inode);
	433	drop_nlink(new_inode);
cbd56e7d	434
57397d86 JK	435	if (!new_inode->i_nlink)
57397d86 JK	436	add_orphan_inode(sbi, new_inode->i_ino);
cbd56e7d JK	437	else
	438	release_orphan_inode(sbi);
	439
8cb82688	440	update_inode_page(old_inode);
39936837	441	update_inode_page(new_inode);
57397d86 JK	442	} else {
	443	err = f2fs_add_link(new_dentry, old_inode);
	444	if (err)
	445	goto out_dir;
	446
	447	if (old_dir_entry) {
	448	inc_nlink(new_dir);
39936837	449	update_inode_page(new_dir);
57397d86 JK	450	}
	451	}
	452
	453	old_inode->i_ctime = CURRENT_TIME;
57397d86 JK	454	mark_inode_dirty(old_inode);
	455
	456	f2fs_delete_entry(old_entry, old_page, NULL);
	457
	458	if (old_dir_entry) {
	459	if (old_dir != new_dir) {
	460	f2fs_set_link(old_inode, old_dir_entry,
	461	old_dir_page, new_dir);
	462	} else {
	463	kunmap(old_dir_page);
	464	f2fs_put_page(old_dir_page, 0);
	465	}
	466	drop_nlink(old_dir);
39936837	467	update_inode_page(old_dir);
57397d86 JK	468	}
57397d86 JK	469
39936837	470	mutex_unlock_op(sbi, ilock);
57397d86 JK	471	return 0;
57397d86 JK	472
cbd56e7d JK	473	put_out_dir:
cbd56e7d JK	474	f2fs_put_page(new_page, 1);
57397d86 JK	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	};