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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: Jaegeuk Kim <jaegeuk.kim@samsung.com>
This commit is contained in:
Jaegeuk Kim 2014-02-27 20:09:05 +09:00
parent 3843154598
commit ab9fa662e4
3 changed files with 17 additions and 0 deletions
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7
Documentation/filesystems/f2fs.txt
View File

@ -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
================================================================================

3
fs/f2fs/f2fs.h
View File

@ -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 */

7
fs/f2fs/super.c
View File

@ -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;
}
/*