f2fs: add an sysfs entry to control the directory level (ab9fa662) · Commits · 戴 / test

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

+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 */

+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;
		}

		/*