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

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

The segctor group contains attributes that describe
segctor thread activity details:
(1) last_pseg_block - show start block number of the latest segment.
(2) last_seg_sequence - show sequence value of the latest segment.
(3) last_seg_checkpoint - show checkpoint number of the latest segment.
(4) current_seg_sequence - show segment sequence counter.
(5) current_last_full_seg - show index number of the latest full segment.
(6) next_full_seg - show index number of the full segment index
to be used next.
(7) next_pseg_offset - show offset of next partial segment in
the current full segment.
(8) next_checkpoint - show next checkpoint number.
(9) last_seg_write_time - show write time of the last segment
in human-readable format.
(10) last_seg_write_time_secs - show write time of the last segment
in seconds.
(11) last_nongc_write_time - show write time of the last segment
not for cleaner operation in human-readable format.
(12) last_nongc_write_time_secs - show write time of the last segment
not for cleaner operation in seconds.
(13) dirty_data_blocks_count - show number of dirty data blocks.

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, 90 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-fs-nilfs2 b/Documentation/ABI/testing/sysfs-fs-nilfs2
index e9b4c61aa88a..c9952f4071e7 100644
--- a/Documentation/ABI/testing/sysfs-fs-nilfs2
+++ b/Documentation/ABI/testing/sysfs-fs-nilfs2
@@ -89,3 +89,93 @@ Contact:	"Vyacheslav Dubeyko" <slava@dubeyko.com>
 Description:
                 Describe attributes of /sys/fs/nilfs2/<device>/superblock
                 group.
+
+What:           /sys/fs/nilfs2/<device>/segctor/last_pseg_block
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show start block number of the latest segment.
+
+What:           /sys/fs/nilfs2/<device>/segctor/last_seg_sequence
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show sequence value of the latest segment.
+
+What:           /sys/fs/nilfs2/<device>/segctor/last_seg_checkpoint
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show checkpoint number of the latest segment.
+
+What:           /sys/fs/nilfs2/<device>/segctor/current_seg_sequence
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show segment sequence counter.
+
+What:           /sys/fs/nilfs2/<device>/segctor/current_last_full_seg
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show index number of the latest full segment.
+
+What:           /sys/fs/nilfs2/<device>/segctor/next_full_seg
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show index number of the full segment index
+                to be used next.
+
+What:           /sys/fs/nilfs2/<device>/segctor/next_pseg_offset
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show offset of next partial segment in the current
+                full segment.
+
+What:           /sys/fs/nilfs2/<device>/segctor/next_checkpoint
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show next checkpoint number.
+
+What:           /sys/fs/nilfs2/<device>/segctor/last_seg_write_time
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show write time of the last segment in
+                human-readable format.
+
+What:           /sys/fs/nilfs2/<device>/segctor/last_seg_write_time_secs
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show write time of the last segment in seconds.
+
+What:           /sys/fs/nilfs2/<device>/segctor/last_nongc_write_time
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show write time of the last segment not for cleaner
+                operation in human-readable format.
+
+What:           /sys/fs/nilfs2/<device>/segctor/last_nongc_write_time_secs
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show write time of the last segment not for cleaner
+                operation in seconds.
+
+What:           /sys/fs/nilfs2/<device>/segctor/dirty_data_blocks_count
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Show number of dirty data blocks.
+
+What:           /sys/fs/nilfs2/<device>/segctor/README
+Date:           April 2014
+Contact:        "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+                Describe attributes of /sys/fs/nilfs2/<device>/segctor
+                group.