tree efa4cc308d41d83c0bd527df11bda8ca48e5eca8
parent 3843154598a00408f4214a68bd536fdf27b1df10
author Jaegeuk Kim <jaegeuk.kim@samsung.com> 1393499345 +0900
committer Jaegeuk Kim <jaegeuk.kim@samsung.com> 1393500675 +0900

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>