nilfs2: implementation of NILFS_IOCTL_SET_SUINFO ioctl

[deliverable/linux.git] / Documentation / filesystems / nilfs2.txt

diff --git a/Documentation/filesystems/nilfs2.txt b/Documentation/filesystems/nilfs2.txt
index 06887d46ccf2795e8a6f46b1528e985a5ac1975b..8b887ae4e39ec510398f82f77e2029ce68b569c7 100644 (file)
--- a/Documentation/filesystems/nilfs2.txt
+++ b/Documentation/filesystems/nilfs2.txt
@@ -111,6 +111,13 @@ Table of NILFS2 specific ioctls
                                nilfs_resize utilities and by nilfs_cleanerd
                                daemon.
 
+ NILFS_IOCTL_SET_SUINFO         Modify segment usage info of requested
+                               segments. This ioctl is used by
+                               nilfs_cleanerd daemon to skip unnecessary
+                               cleaning operation of segments and reduce
+                               performance penalty or wear of flash device
+                               due to redundant move of in-use blocks.
+
  NILFS_IOCTL_GET_SUSTAT         Return segment usage statistics. This ioctl
                                is used in lssu, nilfs_resize utilities and
                                by nilfs_cleanerd daemon.