[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);
	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])) {
			set_cold_file(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);

	if (!sbi->por_doing)
		d_instantiate(dentry, inode);
	unlock_new_inode(inode);
	return 0;
out:
	clear_nlink(inode);
	unlock_new_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;
	atomic_inc(&inode->i_count);

	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;

	/*
	 * This file should be checkpointed during fsync.
	 * We lost i_pino from now on.
	 */
	set_cp_file(inode);

	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);
	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);
	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);
	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;

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