[mirror_ubuntu-zesty-kernel.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 <linux/dcache.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 f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	nid_t ino;
	struct inode *inode;
	bool nid_free = false;
	int err;

	inode = new_inode(dir->i_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_init_owner(inode, dir, mode);

	inode->i_ino = ino;
	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 f2fs_sb_info *sbi = F2FS_SB(dir->i_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 f2fs_sb_info *sbi = F2FS_SB(dir->i_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);

		stat_inc_inline_inode(inode);
	}

	return d_splice_alias(inode, dentry);
}

static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_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 f2fs_sb_info *sbi = F2FS_SB(dir->i_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 f2fs_sb_info *sbi = F2FS_SB(dir->i_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 f2fs_sb_info *sbi = F2FS_SB(old_dir->i_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);

		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);
		}
	}

	down_write(&F2FS_I(old_inode)->i_sem);
	file_lost_pino(old_inode);
	up_write(&F2FS_I(old_inode)->i_sem);

	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);
			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:
	kunmap(new_page);
	f2fs_put_page(new_page, 0);
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;
}

static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	struct inode *inode;
	int err;

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

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

	f2fs_lock_op(sbi);
	err = acquire_orphan_inode(sbi);
	if (err)
		goto out;

	err = f2fs_do_tmpfile(inode, dir);
	if (err)
		goto release_out;

	/*
	 * add this non-linked tmpfile to orphan list, in this way we could
	 * remove all unused data of tmpfile after abnormal power-off.
	 */
	add_orphan_inode(sbi, inode->i_ino);
	f2fs_unlock_op(sbi);

	alloc_nid_done(sbi, inode->i_ino);
	d_tmpfile(dentry, inode);
	unlock_new_inode(inode);
	return 0;

release_out:
	release_orphan_inode(sbi);
out:
	f2fs_unlock_op(sbi);
	clear_nlink(inode);
	unlock_new_inode(inode);
	make_bad_inode(inode);
	iput(inode);
	alloc_nid_failed(sbi, inode->i_ino);
	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,
	.tmpfile	= f2fs_tmpfile,
	.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>
50732df0	16	#include <linux/dcache.h>
57397d86 JK	17
57397d86 JK	18	#include "f2fs.h"
953a3e27	19	#include "node.h"
57397d86 JK	20	#include "xattr.h"
57397d86 JK	21	#include "acl.h"
a2a4a7e4	22	#include <trace/events/f2fs.h>
57397d86 JK	23
	24	static struct inode f2fs_new_inode(struct inode dir, umode_t mode)
	25	{
a014e037	26	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
57397d86 JK	27	nid_t ino;
	28	struct inode *inode;
	29	bool nid_free = false;
e479556b	30	int err;
57397d86	31
a014e037	32	inode = new_inode(dir->i_sb);
57397d86 JK	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	43
70ff5dfe	44	inode_init_owner(inode, dir, mode);
57397d86 JK	45
57397d86 JK	46	inode->i_ino = ino;
57397d86 JK	47	inode->i_blocks = 0;
	48	inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
	49	inode->i_generation = sbi->s_next_generation++;
	50
	51	err = insert_inode_locked(inode);
	52	if (err) {
	53	err = -EINVAL;
	54	nid_free = true;
	55	goto out;
	56	}
d70b4f53	57	trace_f2fs_new_inode(inode, 0);
57397d86 JK	58	mark_inode_dirty(inode);
	59	return inode;
	60
	61	out:
	62	clear_nlink(inode);
	63	unlock_new_inode(inode);
	64	fail:
d70b4f53	65	trace_f2fs_new_inode(inode, err);
531ad7d5	66	make_bad_inode(inode);
57397d86 JK	67	iput(inode);
	68	if (nid_free)
	69	alloc_nid_failed(sbi, ino);
	70	return ERR_PTR(err);
	71	}
	72
	73	static int is_multimedia_file(const unsigned char s, const char sub)
	74	{
9836b8b9 LR	75	size_t slen = strlen(s);
9836b8b9 LR	76	size_t sublen = strlen(sub);
57397d86 JK	77
57397d86 JK	78	if (sublen > slen)
e66509f0	79	return 0;
57397d86	80
749ebfd1	81	return !strncasecmp(s + slen - sublen, sub, sublen);
57397d86 JK	82	}
57397d86 JK	83
0a8165d7	84	/*
57397d86 JK	85	* Set multimedia files as cold files for hot/cold data separation
57397d86 JK	86	*/
953a3e27	87	static inline void set_cold_files(struct f2fs_sb_info sbi, struct inode inode,
57397d86 JK	88	const unsigned char *name)
	89	{
	90	int i;
	91	__u8 (*extlist)[8] = sbi->raw_super->extension_list;
	92
	93	int count = le32_to_cpu(sbi->raw_super->extension_count);
	94	for (i = 0; i < count; i++) {
e66509f0	95	if (is_multimedia_file(name, extlist[i])) {
354a3399	96	file_set_cold(inode);
57397d86 JK	97	break;
	98	}
	99	}
	100	}
	101
	102	static int f2fs_create(struct inode dir, struct dentry dentry, umode_t mode,
	103	bool excl)
	104	{
a014e037	105	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
57397d86 JK	106	struct inode *inode;
57397d86 JK	107	nid_t ino = 0;
e479556b	108	int err;
57397d86	109
1efef832 JK	110	f2fs_balance_fs(sbi);
1efef832 JK	111
57397d86 JK	112	inode = f2fs_new_inode(dir, mode);
	113	if (IS_ERR(inode))
	114	return PTR_ERR(inode);
	115
	116	if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
953a3e27	117	set_cold_files(sbi, inode, dentry->d_name.name);
57397d86 JK	118
	119	inode->i_op = &f2fs_file_inode_operations;
	120	inode->i_fop = &f2fs_file_operations;
	121	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	122	ino = inode->i_ino;
	123
e479556b	124	f2fs_lock_op(sbi);
57397d86	125	err = f2fs_add_link(dentry, inode);
e479556b	126	f2fs_unlock_op(sbi);
57397d86 JK	127	if (err)
	128	goto out;
	129
	130	alloc_nid_done(sbi, ino);
	131
0a364af1	132	d_instantiate(dentry, inode);
57397d86	133	unlock_new_inode(inode);
57397d86 JK	134	return 0;
	135	out:
	136	clear_nlink(inode);
	137	unlock_new_inode(inode);
531ad7d5	138	make_bad_inode(inode);
57397d86 JK	139	iput(inode);
	140	alloc_nid_failed(sbi, ino);
	141	return err;
	142	}
	143
	144	static int f2fs_link(struct dentry old_dentry, struct inode dir,
	145	struct dentry *dentry)
	146	{
	147	struct inode *inode = old_dentry->d_inode;
a014e037	148	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
e479556b	149	int err;
57397d86	150
1efef832 JK	151	f2fs_balance_fs(sbi);
1efef832 JK	152
57397d86	153	inode->i_ctime = CURRENT_TIME;
6f6fd833	154	ihold(inode);
57397d86 JK	155
57397d86 JK	156	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
e479556b	157	f2fs_lock_op(sbi);
57397d86	158	err = f2fs_add_link(dentry, inode);
e479556b	159	f2fs_unlock_op(sbi);
57397d86 JK	160	if (err)
	161	goto out;
	162
	163	d_instantiate(dentry, inode);
57397d86 JK	164	return 0;
	165	out:
	166	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	167	iput(inode);
	168	return err;
	169	}
	170
	171	struct dentry f2fs_get_parent(struct dentry child)
	172	{
	173	struct qstr dotdot = QSTR_INIT("..", 2);
	174	unsigned long ino = f2fs_inode_by_name(child->d_inode, &dotdot);
	175	if (!ino)
	176	return ERR_PTR(-ENOENT);
	177	return d_obtain_alias(f2fs_iget(child->d_inode->i_sb, ino));
	178	}
	179
	180	static struct dentry f2fs_lookup(struct inode dir, struct dentry *dentry,
	181	unsigned int flags)
	182	{
	183	struct inode *inode = NULL;
	184	struct f2fs_dir_entry *de;
	185	struct page *page;
	186
5a20d339	187	if (dentry->d_name.len > F2FS_NAME_LEN)
57397d86 JK	188	return ERR_PTR(-ENAMETOOLONG);
	189
	190	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	191	if (de) {
	192	nid_t ino = le32_to_cpu(de->ino);
	193	kunmap(page);
	194	f2fs_put_page(page, 0);
	195
	196	inode = f2fs_iget(dir->i_sb, ino);
	197	if (IS_ERR(inode))
	198	return ERR_CAST(inode);
48b230a5 CY	199
48b230a5 CY	200	stat_inc_inline_inode(inode);
57397d86 JK	201	}
	202
	203	return d_splice_alias(inode, dentry);
	204	}
	205
	206	static int f2fs_unlink(struct inode dir, struct dentry dentry)
	207	{
a014e037	208	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
57397d86 JK	209	struct inode *inode = dentry->d_inode;
	210	struct f2fs_dir_entry *de;
	211	struct page *page;
	212	int err = -ENOENT;
	213
a2a4a7e4	214	trace_f2fs_unlink_enter(dir, dentry);
1efef832 JK	215	f2fs_balance_fs(sbi);
1efef832 JK	216
57397d86 JK	217	de = f2fs_find_entry(dir, &dentry->d_name, &page);
	218	if (!de)
	219	goto fail;
	220
ccaaca25	221	f2fs_lock_op(sbi);
cbd56e7d	222	err = acquire_orphan_inode(sbi);
57397d86	223	if (err) {
ccaaca25	224	f2fs_unlock_op(sbi);
57397d86 JK	225	kunmap(page);
	226	f2fs_put_page(page, 0);
	227	goto fail;
	228	}
57397d86	229	f2fs_delete_entry(de, page, inode);
e479556b	230	f2fs_unlock_op(sbi);
57397d86 JK	231
	232	/* In order to evict this inode, we set it dirty */
	233	mark_inode_dirty(inode);
57397d86	234	fail:
a2a4a7e4	235	trace_f2fs_unlink_exit(inode, err);
57397d86 JK	236	return err;
	237	}
	238
	239	static int f2fs_symlink(struct inode dir, struct dentry dentry,
	240	const char *symname)
	241	{
a014e037	242	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
57397d86	243	struct inode *inode;
9836b8b9	244	size_t symlen = strlen(symname) + 1;
e479556b	245	int err;
57397d86	246
1efef832 JK	247	f2fs_balance_fs(sbi);
1efef832 JK	248
57397d86 JK	249	inode = f2fs_new_inode(dir, S_IFLNK \| S_IRWXUGO);
	250	if (IS_ERR(inode))
	251	return PTR_ERR(inode);
	252
	253	inode->i_op = &f2fs_symlink_inode_operations;
	254	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	255
e479556b	256	f2fs_lock_op(sbi);
57397d86	257	err = f2fs_add_link(dentry, inode);
e479556b	258	f2fs_unlock_op(sbi);
57397d86 JK	259	if (err)
	260	goto out;
	261
	262	err = page_symlink(inode, symname, symlen);
	263	alloc_nid_done(sbi, inode->i_ino);
	264
	265	d_instantiate(dentry, inode);
	266	unlock_new_inode(inode);
57397d86 JK	267	return err;
	268	out:
	269	clear_nlink(inode);
	270	unlock_new_inode(inode);
531ad7d5	271	make_bad_inode(inode);
57397d86 JK	272	iput(inode);
	273	alloc_nid_failed(sbi, inode->i_ino);
	274	return err;
	275	}
	276
	277	static int f2fs_mkdir(struct inode dir, struct dentry dentry, umode_t mode)
	278	{
	279	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
	280	struct inode *inode;
e479556b	281	int err;
57397d86	282
1efef832 JK	283	f2fs_balance_fs(sbi);
1efef832 JK	284
57397d86	285	inode = f2fs_new_inode(dir, S_IFDIR \| mode);
57397d86	286	if (IS_ERR(inode))
61412b64	287	return PTR_ERR(inode);
57397d86 JK	288
	289	inode->i_op = &f2fs_dir_inode_operations;
	290	inode->i_fop = &f2fs_dir_operations;
	291	inode->i_mapping->a_ops = &f2fs_dblock_aops;
a0d42539	292	mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_ZERO);
57397d86 JK	293
57397d86 JK	294	set_inode_flag(F2FS_I(inode), FI_INC_LINK);
e479556b	295	f2fs_lock_op(sbi);
57397d86	296	err = f2fs_add_link(dentry, inode);
e479556b	297	f2fs_unlock_op(sbi);
57397d86 JK	298	if (err)
	299	goto out_fail;
	300
	301	alloc_nid_done(sbi, inode->i_ino);
	302
	303	d_instantiate(dentry, inode);
	304	unlock_new_inode(inode);
	305
57397d86 JK	306	return 0;
	307
	308	out_fail:
	309	clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
	310	clear_nlink(inode);
	311	unlock_new_inode(inode);
531ad7d5	312	make_bad_inode(inode);
57397d86 JK	313	iput(inode);
	314	alloc_nid_failed(sbi, inode->i_ino);
	315	return err;
	316	}
	317
	318	static int f2fs_rmdir(struct inode dir, struct dentry dentry)
	319	{
	320	struct inode *inode = dentry->d_inode;
	321	if (f2fs_empty_dir(inode))
	322	return f2fs_unlink(dir, dentry);
	323	return -ENOTEMPTY;
	324	}
	325
	326	static int f2fs_mknod(struct inode dir, struct dentry dentry,
	327	umode_t mode, dev_t rdev)
	328	{
a014e037	329	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
57397d86 JK	330	struct inode *inode;
	331	int err = 0;
	332
	333	if (!new_valid_dev(rdev))
	334	return -EINVAL;
	335
1efef832 JK	336	f2fs_balance_fs(sbi);
1efef832 JK	337
57397d86 JK	338	inode = f2fs_new_inode(dir, mode);
	339	if (IS_ERR(inode))
	340	return PTR_ERR(inode);
	341
	342	init_special_inode(inode, inode->i_mode, rdev);
	343	inode->i_op = &f2fs_special_inode_operations;
	344
e479556b	345	f2fs_lock_op(sbi);
57397d86	346	err = f2fs_add_link(dentry, inode);
e479556b	347	f2fs_unlock_op(sbi);
57397d86 JK	348	if (err)
	349	goto out;
	350
	351	alloc_nid_done(sbi, inode->i_ino);
	352	d_instantiate(dentry, inode);
	353	unlock_new_inode(inode);
57397d86 JK	354	return 0;
	355	out:
	356	clear_nlink(inode);
	357	unlock_new_inode(inode);
531ad7d5	358	make_bad_inode(inode);
57397d86 JK	359	iput(inode);
	360	alloc_nid_failed(sbi, inode->i_ino);
	361	return err;
	362	}
	363
	364	static int f2fs_rename(struct inode old_dir, struct dentry old_dentry,
	365	struct inode new_dir, struct dentry new_dentry)
	366	{
a014e037	367	struct f2fs_sb_info *sbi = F2FS_SB(old_dir->i_sb);
57397d86 JK	368	struct inode *old_inode = old_dentry->d_inode;
	369	struct inode *new_inode = new_dentry->d_inode;
	370	struct page *old_dir_page;
cbd56e7d	371	struct page old_page, new_page;
57397d86 JK	372	struct f2fs_dir_entry *old_dir_entry = NULL;
	373	struct f2fs_dir_entry *old_entry;
	374	struct f2fs_dir_entry *new_entry;
e479556b	375	int err = -ENOENT;
57397d86	376
1efef832 JK	377	f2fs_balance_fs(sbi);
1efef832 JK	378
57397d86 JK	379	old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
	380	if (!old_entry)
	381	goto out;
	382
	383	if (S_ISDIR(old_inode->i_mode)) {
	384	err = -EIO;
	385	old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
	386	if (!old_dir_entry)
	387	goto out_old;
	388	}
	389
e479556b	390	f2fs_lock_op(sbi);
57397d86 JK	391
57397d86 JK	392	if (new_inode) {
57397d86 JK	393
	394	err = -ENOTEMPTY;
	395	if (old_dir_entry && !f2fs_empty_dir(new_inode))
	396	goto out_dir;
	397
	398	err = -ENOENT;
	399	new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
	400	&new_page);
	401	if (!new_entry)
	402	goto out_dir;
	403
cbd56e7d JK	404	err = acquire_orphan_inode(sbi);
	405	if (err)
	406	goto put_out_dir;
	407
1cd14caf	408	if (update_dent_inode(old_inode, &new_dentry->d_name)) {
cbd56e7d JK	409	release_orphan_inode(sbi);
cbd56e7d JK	410	goto put_out_dir;
1cd14caf JK	411	}
1cd14caf JK	412
57397d86 JK	413	f2fs_set_link(new_dir, new_entry, new_page, old_inode);
	414
	415	new_inode->i_ctime = CURRENT_TIME;
d928bfbf	416	down_write(&F2FS_I(new_inode)->i_sem);
57397d86 JK	417	if (old_dir_entry)
	418	drop_nlink(new_inode);
	419	drop_nlink(new_inode);
d928bfbf JK	420	up_write(&F2FS_I(new_inode)->i_sem);
d928bfbf JK	421
a18ff063	422	mark_inode_dirty(new_inode);
cbd56e7d	423
57397d86 JK	424	if (!new_inode->i_nlink)
57397d86 JK	425	add_orphan_inode(sbi, new_inode->i_ino);
cbd56e7d JK	426	else
	427	release_orphan_inode(sbi);
	428
8cb82688	429	update_inode_page(old_inode);
39936837	430	update_inode_page(new_inode);
57397d86 JK	431	} else {
	432	err = f2fs_add_link(new_dentry, old_inode);
	433	if (err)
	434	goto out_dir;
	435
	436	if (old_dir_entry) {
	437	inc_nlink(new_dir);
39936837	438	update_inode_page(new_dir);
57397d86 JK	439	}
	440	}
	441
b2c08299 JK	442	down_write(&F2FS_I(old_inode)->i_sem);
	443	file_lost_pino(old_inode);
	444	up_write(&F2FS_I(old_inode)->i_sem);
	445
57397d86	446	old_inode->i_ctime = CURRENT_TIME;
57397d86 JK	447	mark_inode_dirty(old_inode);
	448
	449	f2fs_delete_entry(old_entry, old_page, NULL);
	450
	451	if (old_dir_entry) {
	452	if (old_dir != new_dir) {
	453	f2fs_set_link(old_inode, old_dir_entry,
	454	old_dir_page, new_dir);
a18ff063	455	update_inode_page(old_inode);
57397d86 JK	456	} else {
	457	kunmap(old_dir_page);
	458	f2fs_put_page(old_dir_page, 0);
	459	}
	460	drop_nlink(old_dir);
a18ff063	461	mark_inode_dirty(old_dir);
39936837	462	update_inode_page(old_dir);
57397d86 JK	463	}
57397d86 JK	464
e479556b	465	f2fs_unlock_op(sbi);
57397d86 JK	466	return 0;
57397d86 JK	467
cbd56e7d	468	put_out_dir:
dd4d961f CY	469	kunmap(new_page);
dd4d961f CY	470	f2fs_put_page(new_page, 0);
57397d86 JK	471	out_dir:
	472	if (old_dir_entry) {
	473	kunmap(old_dir_page);
	474	f2fs_put_page(old_dir_page, 0);
	475	}
e479556b	476	f2fs_unlock_op(sbi);
57397d86 JK	477	out_old:
	478	kunmap(old_page);
	479	f2fs_put_page(old_page, 0);
	480	out:
	481	return err;
	482	}
	483
50732df0 CY	484	static int f2fs_tmpfile(struct inode dir, struct dentry dentry, umode_t mode)
50732df0 CY	485	{
a014e037	486	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
50732df0	487	struct inode *inode;
50732df0 CY	488	int err;
	489
	490	inode = f2fs_new_inode(dir, mode);
	491	if (IS_ERR(inode))
	492	return PTR_ERR(inode);
	493
	494	inode->i_op = &f2fs_file_inode_operations;
	495	inode->i_fop = &f2fs_file_operations;
	496	inode->i_mapping->a_ops = &f2fs_dblock_aops;
	497
	498	f2fs_lock_op(sbi);
	499	err = acquire_orphan_inode(sbi);
	500	if (err)
	501	goto out;
b97a9b5d JK	502
	503	err = f2fs_do_tmpfile(inode, dir);
	504	if (err)
	505	goto release_out;
	506
50732df0 CY	507	/*
	508	* add this non-linked tmpfile to orphan list, in this way we could
	509	* remove all unused data of tmpfile after abnormal power-off.
	510	*/
	511	add_orphan_inode(sbi, inode->i_ino);
50732df0 CY	512	f2fs_unlock_op(sbi);
	513
	514	alloc_nid_done(sbi, inode->i_ino);
50732df0 CY	515	d_tmpfile(dentry, inode);
	516	unlock_new_inode(inode);
	517	return 0;
b97a9b5d JK	518
	519	release_out:
	520	release_orphan_inode(sbi);
50732df0 CY	521	out:
	522	f2fs_unlock_op(sbi);
	523	clear_nlink(inode);
	524	unlock_new_inode(inode);
	525	make_bad_inode(inode);
	526	iput(inode);
	527	alloc_nid_failed(sbi, inode->i_ino);
	528	return err;
	529	}
	530
57397d86 JK	531	const struct inode_operations f2fs_dir_inode_operations = {
	532	.create = f2fs_create,
	533	.lookup = f2fs_lookup,
	534	.link = f2fs_link,
	535	.unlink = f2fs_unlink,
	536	.symlink = f2fs_symlink,
	537	.mkdir = f2fs_mkdir,
	538	.rmdir = f2fs_rmdir,
	539	.mknod = f2fs_mknod,
	540	.rename = f2fs_rename,
50732df0	541	.tmpfile = f2fs_tmpfile,
2d4d9fb5	542	.getattr = f2fs_getattr,
57397d86 JK	543	.setattr = f2fs_setattr,
57397d86 JK	544	.get_acl = f2fs_get_acl,
a6dda0e6	545	.set_acl = f2fs_set_acl,
57397d86 JK	546	#ifdef CONFIG_F2FS_FS_XATTR
	547	.setxattr = generic_setxattr,
	548	.getxattr = generic_getxattr,
	549	.listxattr = f2fs_listxattr,
	550	.removexattr = generic_removexattr,
	551	#endif
	552	};
	553
	554	const struct inode_operations f2fs_symlink_inode_operations = {
	555	.readlink = generic_readlink,
	556	.follow_link = page_follow_link_light,
	557	.put_link = page_put_link,
2d4d9fb5	558	.getattr = f2fs_getattr,
57397d86 JK	559	.setattr = f2fs_setattr,
	560	#ifdef CONFIG_F2FS_FS_XATTR
	561	.setxattr = generic_setxattr,
	562	.getxattr = generic_getxattr,
	563	.listxattr = f2fs_listxattr,
	564	.removexattr = generic_removexattr,
	565	#endif
	566	};
	567
	568	const struct inode_operations f2fs_special_inode_operations = {
2d4d9fb5	569	.getattr = f2fs_getattr,
57397d86 JK	570	.setattr = f2fs_setattr,
57397d86 JK	571	.get_acl = f2fs_get_acl,
a6dda0e6	572	.set_acl = f2fs_set_acl,
57397d86 JK	573	#ifdef CONFIG_F2FS_FS_XATTR
	574	.setxattr = generic_setxattr,
	575	.getxattr = generic_getxattr,
	576	.listxattr = f2fs_listxattr,
	577	.removexattr = generic_removexattr,
	578	#endif
	579	};