f2fs: add description about small_discards in document

This patch adds a description about small_disacrds in the f2fs document.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/Documentation/filesystems/f2fs.txt b/Documentation/filesystems/f2fs.txt
index 1a94ac7..02357e3 100644 (file)
--- a/Documentation/filesystems/f2fs.txt
+++ b/Documentation/filesystems/f2fs.txt
@@ -171,6 +171,12 @@ Files in /sys/fs/f2fs/<devname>
                              conduct checkpoint to reclaim the prefree segments
                              to free segments. By default, 100 segments, 200MB.
 
+ max_small_discards          This parameter controls the number of discard
+                             commands that consist small blocks less than 2MB.
+                             The candidates to be discarded are cached until
+                             checkpoint is triggered, and issued during the
+                             checkpoint. By default, it is disabled with 0.
+
  ipu_policy                   This parameter controls the policy of in-place
                               updates in f2fs. There are five policies:
                                0: F2FS_IPU_FORCE, 1: F2FS_IPU_SSR,