nilfs2: add /sys/fs/nilfs2/<device>/segments group

This patch adds creation of /sys/fs/nilfs2/<device>/segments
group.

The segments group contains attributes that describe
details about volume's segments:
(1) segments_number - show number of segments on volume.
(2) blocks_per_segment - show number of blocks in segment.
(3) clean_segments - show count of clean segments.
(4) dirty_segments - show count of dirty segments.

Signed-off-by: Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>
Cc: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Cc: Michael L. Semon <mlsemon35@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-fs-nilfs2 b/Documentation/ABI/testing/sysfs-fs-nilfs2
index c9952f4071e7..d39e0768171e 100644
--- a/Documentation/ABI/testing/sysfs-fs-nilfs2
+++ b/Documentation/ABI/testing/sysfs-fs-nilfs2
@@ -179,3 +179,34 @@ Contact:	"Vyacheslav Dubeyko" <slava@dubeyko.com>
 Description:
                 Describe attributes of /sys/fs/nilfs2/<device>/segctor
                 group.
+
+What:           /sys/fs/nilfs2/<device>/segments/segments_number
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show number of segments on a volume.
+
+What:           /sys/fs/nilfs2/<device>/segments/blocks_per_segment
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show number of blocks in segment.
+
+What:           /sys/fs/nilfs2/<device>/segments/clean_segments
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show count of clean segments.
+
+What:           /sys/fs/nilfs2/<device>/segments/dirty_segments
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show count of dirty segments.
+
+What:           /sys/fs/nilfs2/<device>/segments/README
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Describe attributes of /sys/fs/nilfs2/<device>/segments
+                group.