nilfs2: add /sys/fs/nilfs2/<device>/mounted_snapshots/<snapshot> group
This patch adds creation of <snapshot> group for every mounted
snapshot in /sys/fs/nilfs2/<device>/mounted_snapshots group.
The group contains details about mounted snapshot:
(1) inodes_count - show number of inodes for snapshot.
(2) blocks_count - show number of blocks for snapshot.
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>
diff --git a/fs/nilfs2/sysfs.h b/fs/nilfs2/sysfs.h
index 4e84e23..677e3a1 100644
--- a/fs/nilfs2/sysfs.h
+++ b/fs/nilfs2/sysfs.h
@@ -86,6 +86,17 @@
NILFS_DEV_ATTR_STRUCT(superblock);
NILFS_DEV_ATTR_STRUCT(segctor);
+#define NILFS_CP_ATTR_STRUCT(name) \
+struct nilfs_##name##_attr { \
+ struct attribute attr; \
+ ssize_t (*show)(struct nilfs_##name##_attr *, struct nilfs_root *, \
+ char *); \
+ ssize_t (*store)(struct nilfs_##name##_attr *, struct nilfs_root *, \
+ const char *, size_t); \
+};
+
+NILFS_CP_ATTR_STRUCT(snapshot);
+
#define NILFS_ATTR(type, name, mode, show, store) \
static struct nilfs_##type##_attr nilfs_##type##_attr_##name = \
__ATTR(name, mode, show, store)
@@ -126,6 +137,13 @@
#define NILFS_CHECKPOINTS_RW_ATTR(name) \
NILFS_RW_ATTR(checkpoints, name)
+#define NILFS_SNAPSHOT_INFO_ATTR(name) \
+ NILFS_INFO_ATTR(snapshot, name)
+#define NILFS_SNAPSHOT_RO_ATTR(name) \
+ NILFS_RO_ATTR(snapshot, name)
+#define NILFS_SNAPSHOT_RW_ATTR(name) \
+ NILFS_RW_ATTR(snapshot, name)
+
#define NILFS_SUPERBLOCK_RO_ATTR(name) \
NILFS_RO_ATTR(superblock, name)
#define NILFS_SUPERBLOCK_RW_ATTR(name) \
@@ -148,6 +166,8 @@
(&nilfs_mounted_snapshots_attr_##name.attr)
#define NILFS_CHECKPOINTS_ATTR_LIST(name) \
(&nilfs_checkpoints_attr_##name.attr)
+#define NILFS_SNAPSHOT_ATTR_LIST(name) \
+ (&nilfs_snapshot_attr_##name.attr)
#define NILFS_SUPERBLOCK_ATTR_LIST(name) \
(&nilfs_superblock_attr_##name.attr)
#define NILFS_SEGCTOR_ATTR_LIST(name) \