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authorVyacheslav Dubeyko <Vyacheslav.Dubeyko@hgst.com>2014-08-08 14:20:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-08 15:57:21 -0700
commita2ecb791a9d6e71a2d37d66034475a92ebc7e02c (patch)
treef9f5c2d3bd24ef0105786d73561bbcafaca3fb25
parent02a0ba1c60c2ad532322089a60256c8b0f46678c (diff)
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nilfs2: add /sys/fs/nilfs2/<device>/mounted_snapshots group
This patch adds creation of /sys/fs/nilfs2/<device>/mounted_snapshots group. The mounted_snapshots group contains group for every mounted 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>
-rw-r--r--Documentation/ABI/testing/sysfs-fs-nilfs27
-rw-r--r--fs/nilfs2/sysfs.c36
-rw-r--r--fs/nilfs2/sysfs.h12
3 files changed, 54 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-fs-nilfs2 b/Documentation/ABI/testing/sysfs-fs-nilfs2
index 7b820d65d3f0..29dbc8f8bcbd 100644
--- a/Documentation/ABI/testing/sysfs-fs-nilfs2
+++ b/Documentation/ABI/testing/sysfs-fs-nilfs2
@@ -241,3 +241,10 @@ Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
Description:
Describe attributes of /sys/fs/nilfs2/<device>/checkpoints
group.
+
+What: /sys/fs/nilfs2/<device>/mounted_snapshots/README
+Date: April 2014
+Contact: "Vyacheslav Dubeyko" <slava@dubeyko.com>
+Description:
+ Describe content of /sys/fs/nilfs2/<device>/mounted_snapshots
+ group.
diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
index 5cc735fcc1d5..fc0c961d486a 100644
--- a/fs/nilfs2/sysfs.c
+++ b/fs/nilfs2/sysfs.c
@@ -112,6 +112,32 @@ void nilfs_sysfs_delete_##name##_group(struct the_nilfs *nilfs) \
}
/************************************************************************
+ * NILFS mounted snapshots attrs *
+ ************************************************************************/
+
+static const char mounted_snapshots_readme_str[] =
+ "The mounted_snapshots group contains group for\n"
+ "every mounted snapshot.\n";
+
+static ssize_t
+nilfs_mounted_snapshots_README_show(struct nilfs_mounted_snapshots_attr *attr,
+ struct the_nilfs *nilfs, char *buf)
+{
+ return snprintf(buf, PAGE_SIZE, mounted_snapshots_readme_str);
+}
+
+NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(README);
+
+static struct attribute *nilfs_mounted_snapshots_attrs[] = {
+ NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(README),
+ NULL,
+};
+
+NILFS_DEV_INT_GROUP_OPS(mounted_snapshots, dev);
+NILFS_DEV_INT_GROUP_TYPE(mounted_snapshots, dev);
+NILFS_DEV_INT_GROUP_FNS(mounted_snapshots, dev);
+
+/************************************************************************
* NILFS checkpoints attrs *
************************************************************************/
@@ -866,10 +892,14 @@ int nilfs_sysfs_create_device_group(struct super_block *sb)
if (err)
goto free_dev_subgroups;
- err = nilfs_sysfs_create_checkpoints_group(nilfs);
+ err = nilfs_sysfs_create_mounted_snapshots_group(nilfs);
if (err)
goto cleanup_dev_kobject;
+ err = nilfs_sysfs_create_checkpoints_group(nilfs);
+ if (err)
+ goto delete_mounted_snapshots_group;
+
err = nilfs_sysfs_create_segments_group(nilfs);
if (err)
goto delete_checkpoints_group;
@@ -893,6 +923,9 @@ delete_segments_group:
delete_checkpoints_group:
nilfs_sysfs_delete_checkpoints_group(nilfs);
+delete_mounted_snapshots_group:
+ nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
+
cleanup_dev_kobject:
kobject_del(&nilfs->ns_dev_kobj);
@@ -905,6 +938,7 @@ failed_create_device_group:
void nilfs_sysfs_delete_device_group(struct the_nilfs *nilfs)
{
+ nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
nilfs_sysfs_delete_checkpoints_group(nilfs);
nilfs_sysfs_delete_segments_group(nilfs);
nilfs_sysfs_delete_superblock_group(nilfs);
diff --git a/fs/nilfs2/sysfs.h b/fs/nilfs2/sysfs.h
index 62f0a0dc78ca..4e84e230e9dd 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_mounted_snapshots_kobj: /sys/fs/<nilfs>/<device>/mounted_snapshots
+ * @sg_mounted_snapshots_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
@@ -44,6 +46,10 @@ struct nilfs_sysfs_dev_subgroups {
struct kobject sg_segctor_kobj;
struct completion sg_segctor_kobj_unregister;
+ /* /sys/fs/<nilfs>/<device>/mounted_snapshots */
+ struct kobject sg_mounted_snapshots_kobj;
+ struct completion sg_mounted_snapshots_kobj_unregister;
+
/* /sys/fs/<nilfs>/<device>/checkpoints */
struct kobject sg_checkpoints_kobj;
struct completion sg_checkpoints_kobj_unregister;
@@ -75,6 +81,7 @@ struct nilfs_##name##_attr { \
NILFS_DEV_ATTR_STRUCT(dev);
NILFS_DEV_ATTR_STRUCT(segments);
+NILFS_DEV_ATTR_STRUCT(mounted_snapshots);
NILFS_DEV_ATTR_STRUCT(checkpoints);
NILFS_DEV_ATTR_STRUCT(superblock);
NILFS_DEV_ATTR_STRUCT(segctor);
@@ -111,6 +118,9 @@ NILFS_DEV_ATTR_STRUCT(segctor);
#define NILFS_SEGMENTS_RW_ATTR(name) \
NILFS_RW_ATTR(segs_info, name)
+#define NILFS_MOUNTED_SNAPSHOTS_RO_ATTR(name) \
+ NILFS_RO_ATTR(mounted_snapshots, name)
+
#define NILFS_CHECKPOINTS_RO_ATTR(name) \
NILFS_RO_ATTR(checkpoints, name)
#define NILFS_CHECKPOINTS_RW_ATTR(name) \
@@ -134,6 +144,8 @@ NILFS_DEV_ATTR_STRUCT(segctor);
(&nilfs_dev_attr_##name.attr)
#define NILFS_SEGMENTS_ATTR_LIST(name) \
(&nilfs_segments_attr_##name.attr)
+#define NILFS_MOUNTED_SNAPSHOTS_ATTR_LIST(name) \
+ (&nilfs_mounted_snapshots_attr_##name.attr)
#define NILFS_CHECKPOINTS_ATTR_LIST(name) \
(&nilfs_checkpoints_attr_##name.attr)
#define NILFS_SUPERBLOCK_ATTR_LIST(name) \