commit 02a0ba1c60c2ad532322089a60256c8b0f46678c
author Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com> Fri Aug 08 14:20:48 2014 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Fri Aug 08 15:57:21 2014 -0700
tree 78495c866045875516e569378f222b1451037913
parent ef43d5cd84b7d2ea09846de34e14be7d74be3e6f

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

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

The checkpoints group contains attributes that describe
details about volume's checkpoints:
(1) checkpoints_number - show number of checkpoints on volume.
(2) snapshots_number - show number of snapshots on volume.
(3) last_seg_checkpoint - show checkpoint number of the latest segment.
(4) next_checkpoint - show next checkpoint number.

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>

fs/nilfs2/sysfs.h

diff --git a/fs/nilfs2/sysfs.h b/fs/nilfs2/sysfs.h
index 228bdd1..62f0a0d 100644
--- a/fs/nilfs2/sysfs.h
+++ b/fs/nilfs2/sysfs.h
@@ -30,6 +30,8 @@
  * @sg_superblock_kobj_unregister: completion state
  * @sg_segctor_kobj: /sys/fs/<nilfs>/<device>/segctor
  * @sg_segctor_kobj_unregister: completion state
+ * @sg_checkpoints_kobj: /sys/fs/<nilfs>/<device>/checkpoints
+ * @sg_checkpoints_kobj_unregister: completion state
  * @sg_segments_kobj: /sys/fs/<nilfs>/<device>/segments
  * @sg_segments_kobj_unregister: completion state
  */
@@ -42,6 +44,10 @@
 	struct kobject sg_segctor_kobj;
 	struct completion sg_segctor_kobj_unregister;
 
+	/* /sys/fs/<nilfs>/<device>/checkpoints */
+	struct kobject sg_checkpoints_kobj;
+	struct completion sg_checkpoints_kobj_unregister;
+
 	/* /sys/fs/<nilfs>/<device>/segments */
 	struct kobject sg_segments_kobj;
 	struct completion sg_segments_kobj_unregister;
@@ -69,6 +75,7 @@
 
 NILFS_DEV_ATTR_STRUCT(dev);
 NILFS_DEV_ATTR_STRUCT(segments);
+NILFS_DEV_ATTR_STRUCT(checkpoints);
 NILFS_DEV_ATTR_STRUCT(superblock);
 NILFS_DEV_ATTR_STRUCT(segctor);
 
@@ -104,6 +111,11 @@
 #define NILFS_SEGMENTS_RW_ATTR(name) \
 	NILFS_RW_ATTR(segs_info, name)
 
+#define NILFS_CHECKPOINTS_RO_ATTR(name) \
+	NILFS_RO_ATTR(checkpoints, name)
+#define NILFS_CHECKPOINTS_RW_ATTR(name) \
+	NILFS_RW_ATTR(checkpoints, name)
+
 #define NILFS_SUPERBLOCK_RO_ATTR(name) \
 	NILFS_RO_ATTR(superblock, name)
 #define NILFS_SUPERBLOCK_RW_ATTR(name) \
@@ -122,6 +134,8 @@
 	(&nilfs_dev_attr_##name.attr)
 #define NILFS_SEGMENTS_ATTR_LIST(name) \
 	(&nilfs_segments_attr_##name.attr)
+#define NILFS_CHECKPOINTS_ATTR_LIST(name) \
+	(&nilfs_checkpoints_attr_##name.attr)
 #define NILFS_SUPERBLOCK_ATTR_LIST(name) \
 	(&nilfs_superblock_attr_##name.attr)
 #define NILFS_SEGCTOR_ATTR_LIST(name) \