commit ef43d5cd84b7d2ea09846de34e14be7d74be3e6f
author Vyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com> Fri Aug 08 14:20:46 2014 -0700
committer Linus Torvalds <torvalds@linux-foundation.org> Fri Aug 08 15:57:20 2014 -0700
tree 67163715eb9012e931f9a7eefafe59a71ad20401
parent abc968dbf291955ac750ecf59e3baf2b529a8257

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>

fs/nilfs2/sysfs.h

diff --git a/fs/nilfs2/sysfs.h b/fs/nilfs2/sysfs.h
index ad4d5bc..228bdd1 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_segments_kobj: /sys/fs/<nilfs>/<device>/segments
+ * @sg_segments_kobj_unregister: completion state
  */
 struct nilfs_sysfs_dev_subgroups {
 	/* /sys/fs/<nilfs>/<device>/superblock */
@@ -39,6 +41,10 @@
 	/* /sys/fs/<nilfs>/<device>/segctor */
 	struct kobject sg_segctor_kobj;
 	struct completion sg_segctor_kobj_unregister;
+
+	/* /sys/fs/<nilfs>/<device>/segments */
+	struct kobject sg_segments_kobj;
+	struct completion sg_segments_kobj_unregister;
 };
 
 #define NILFS_COMMON_ATTR_STRUCT(name) \
@@ -62,6 +68,7 @@
 };
 
 NILFS_DEV_ATTR_STRUCT(dev);
+NILFS_DEV_ATTR_STRUCT(segments);
 NILFS_DEV_ATTR_STRUCT(superblock);
 NILFS_DEV_ATTR_STRUCT(segctor);
 
@@ -92,6 +99,11 @@
 #define NILFS_DEV_RW_ATTR(name) \
 	NILFS_RW_ATTR(dev, name)
 
+#define NILFS_SEGMENTS_RO_ATTR(name) \
+	NILFS_RO_ATTR(segments, name)
+#define NILFS_SEGMENTS_RW_ATTR(name) \
+	NILFS_RW_ATTR(segs_info, name)
+
 #define NILFS_SUPERBLOCK_RO_ATTR(name) \
 	NILFS_RO_ATTR(superblock, name)
 #define NILFS_SUPERBLOCK_RW_ATTR(name) \
@@ -108,6 +120,8 @@
 	(&nilfs_feature_attr_##name.attr)
 #define NILFS_DEV_ATTR_LIST(name) \
 	(&nilfs_dev_attr_##name.attr)
+#define NILFS_SEGMENTS_ATTR_LIST(name) \
+	(&nilfs_segments_attr_##name.attr)
 #define NILFS_SUPERBLOCK_ATTR_LIST(name) \
 	(&nilfs_superblock_attr_##name.attr)
 #define NILFS_SEGCTOR_ATTR_LIST(name) \