f2fs: add an sysfs entry to control the directory level

[linux-block.git] / Documentation / filesystems / f2fs.txt

diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index 8eb06b0a7d2b0936950e7e5c86c74b8ecad1485d..803784e1e8efd8a5389bfb27fa507103b97465db 100644 (file)
--- 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
 ================================================================================