xfs: add xfs_mount sysfs kobject
Embed a base kobject into xfs_mount. This creates a kobject associated
with each XFS mount and a subdirectory in sysfs with the name of the
filesystem. The subdirectory lifecycle matches that of the mount. Also
add the new xfs_sysfs.[c,h] source files with some XFS sysfs
infrastructure to facilitate attribute creation.
Note that there are currently no attributes exported as part of the
xfs_mount kobject. It exists solely to serve as a per-mount container
for child objects.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_sysfs.h b/fs/xfs/xfs_sysfs.h
new file mode 100644
index 0000000..4bd5fff
--- /dev/null
+++ b/fs/xfs/xfs_sysfs.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2014 Red Hat, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __XFS_SYSFS_H__
+#define __XFS_SYSFS_H__
+
+extern struct kobj_type xfs_mp_ktype; /* xfs_mount */
+
+static inline struct xfs_kobj *
+to_kobj(struct kobject *kobject)
+{
+ return container_of(kobject, struct xfs_kobj, kobject);
+}
+
+static inline void
+xfs_sysfs_release(struct kobject *kobject)
+{
+ struct xfs_kobj *kobj = to_kobj(kobject);
+ complete(&kobj->complete);
+}
+
+static inline int
+xfs_sysfs_init(
+ struct xfs_kobj *kobj,
+ struct kobj_type *ktype,
+ struct xfs_kobj *parent_kobj,
+ const char *name)
+{
+ init_completion(&kobj->complete);
+ return kobject_init_and_add(&kobj->kobject, ktype,
+ &parent_kobj->kobject, "%s", name);
+}
+
+static inline void
+xfs_sysfs_del(
+ struct xfs_kobj *kobj)
+{
+ kobject_del(&kobj->kobject);
+ kobject_put(&kobj->kobject);
+ wait_for_completion(&kobj->complete);
+}
+
+#endif /* __XFS_SYSFS_H__ */