btrfs: publish per-super attributes in sysfs
This patch adds per-super attributes to sysfs.
It doesn't publish any attributes yet, but does the proper lifetime
handling as well as the basic infrastructure to add new attributes.
Signed-off-by: Jeff Mahoney <jeffm@suse.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <clm@fb.com>
diff --git a/fs/btrfs/sysfs.h b/fs/btrfs/sysfs.h
index 863e031..d7c61bd 100644
--- a/fs/btrfs/sysfs.h
+++ b/fs/btrfs/sysfs.h
@@ -15,6 +15,13 @@
.store = _store, \
}
+#define BTRFS_ATTR_RW(_name, _mode, _show, _store) \
+static struct kobj_attribute btrfs_attr_##_name = \
+ __INIT_KOBJ_ATTR(_name, _mode, _show, _store)
+#define BTRFS_ATTR(_name, _mode, _show) \
+ BTRFS_ATTR_RW(_name, _mode, _show, NULL)
+#define BTRFS_ATTR_PTR(_name) (&btrfs_attr_##_name.attr)
+
struct btrfs_feature_attr {
struct kobj_attribute kobj_attr;
enum btrfs_feature_set feature_set;
@@ -40,4 +47,7 @@
/* convert from attribute */
#define to_btrfs_feature_attr(a) \
container_of(a, struct btrfs_feature_attr, kobj_attr)
+#define attr_to_btrfs_attr(a) container_of(a, struct kobj_attribute, attr)
+#define attr_to_btrfs_feature_attr(a) \
+ to_btrfs_feature_attr(attr_to_btrfs_attr(a))
#endif /* _BTRFS_SYSFS_H_ */