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>
diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
index 5cc735fc..fc0c961 100644
--- a/fs/nilfs2/sysfs.c
+++ b/fs/nilfs2/sysfs.c
@@ -112,6 +112,32 @@
}
/************************************************************************
+ * 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 @@
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_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 @@
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);