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Commit ab9fa662 authored by Jaegeuk Kim's avatar Jaegeuk Kim
Browse files

f2fs: add an sysfs entry to control the directory level 



This patch adds an sysfs entry to control dir_level used by the large directory.

The description of this entry is:

 dir_level                    This parameter controls the directory level to
			      support large directory. If a directory has a
			      number of files, it can reduce the file lookup
			      latency by increasing this dir_level value.
			      Otherwise, it needs to decrease this value to
			      reduce the space overhead. The default value is 0.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 38431545

Documentation/filesystems/f2fs.txt

+7 −0
Original line number Diff line number Diff line
@@ -195,6 +195,13 @@ Files in /sys/fs/f2fs/<devname> 
			      cleaning operations. The default value is 4096

			      which covers 8GB block address range.



 dir_level                    This parameter controls the directory level to

			      support large directory. If a directory has a

			      number of files, it can reduce the file lookup

			      latency by increasing this dir_level value.

			      Otherwise, it needs to decrease this value to

			      reduce the space overhead. The default value is 0.



================================================================================

USAGE

================================================================================

fs/f2fs/f2fs.h

+3 −0
Original line number Diff line number Diff line
@@ -196,6 +196,8 @@ struct extent_info { 
#define FADVISE_COLD_BIT	0x01

#define FADVISE_LOST_PINO_BIT	0x02



#define DEF_DIR_LEVEL		0



struct f2fs_inode_info {

	struct inode vfs_inode;		/* serve a vfs inode */

	unsigned long i_flags;		/* keep an inode flags for ioctl */
@@ -447,6 +449,7 @@ struct f2fs_sb_info { 
	unsigned int total_valid_node_count;	/* valid node block count */

	unsigned int total_valid_inode_count;	/* valid inode count */

	int active_logs;			/* # of active logs */

	int dir_level;				/* directory level */



	block_t user_block_count;		/* # of user blocks */

	block_t total_valid_block_count;	/* # of valid blocks */

fs/f2fs/super.c

+7 −0
Original line number Diff line number Diff line
@@ -184,6 +184,7 @@ F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, max_small_discards, max_discards); 
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy);

F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);

F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, max_victim_search, max_victim_search);

F2FS_RW_ATTR(F2FS_SBI, f2fs_sb_info, dir_level, dir_level);



#define ATTR_LIST(name) (&f2fs_attr_##name.attr)

static struct attribute *f2fs_attrs[] = {
@@ -196,6 +197,7 @@ static struct attribute *f2fs_attrs[] = { 
	ATTR_LIST(ipu_policy),

	ATTR_LIST(min_ipu_util),

	ATTR_LIST(max_victim_search),

	ATTR_LIST(dir_level),

	NULL,

};
@@ -359,6 +361,9 @@ static struct inode *f2fs_alloc_inode(struct super_block *sb) 
	if (test_opt(F2FS_SB(sb), INLINE_XATTR))

		set_inode_flag(fi, FI_INLINE_XATTR);



	/* Will be used by directory only */

	fi->i_dir_level = F2FS_SB(sb)->dir_level;



	return &fi->vfs_inode;

}
@@ -785,6 +790,8 @@ static void init_sb_info(struct f2fs_sb_info *sbi) 


	for (i = 0; i < NR_COUNT_TYPE; i++)

		atomic_set(&sbi->nr_pages[i], 0);



	sbi->dir_level = DEF_DIR_LEVEL;

}



/*