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f2fs: add an sysfs entry to control the directory level

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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 <[email protected]>
This commit is contained in:
Jaegeuk Kim 2014-02-27 20:09:05 +09:00
commit ab9fa662e4
3 changed files with 17 additions and 0 deletions
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7
Documentation/filesystems/f2fs.txt
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@ -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
================================================================================