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Subject[PATCH 3/3] f2fs: add an sysfs entry to control the directory level
Date
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>
---
Documentation/filesystems/f2fs.txt | 7 +++++++
fs/f2fs/f2fs.h | 3 +++
fs/f2fs/super.c | 7 +++++++
3 files changed, 17 insertions(+)

diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index 8eb06b0..803784e 100644
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -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
================================================================================
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index a826916..6f88191 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -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 */
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 475560e..1bd9153 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -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;
}

/*
--
1.8.4.474.g128a96c


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