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.c b/fs/btrfs/sysfs.c
index 9e217b5..79be4a187 100644
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -28,6 +28,25 @@
#include "transaction.h"
#include "sysfs.h"
+static void btrfs_release_super_kobj(struct kobject *kobj);
+static struct kobj_type btrfs_ktype = {
+ .sysfs_ops = &kobj_sysfs_ops,
+ .release = btrfs_release_super_kobj,
+};
+
+static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj)
+{
+ if (kobj->ktype != &btrfs_ktype)
+ return NULL;
+ return container_of(kobj, struct btrfs_fs_info, super_kobj);
+}
+
+static void btrfs_release_super_kobj(struct kobject *kobj)
+{
+ struct btrfs_fs_info *fs_info = to_fs_info(kobj);
+ complete(&fs_info->kobj_unregister);
+}
+
static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
struct kobj_attribute *a, char *buf)
{
@@ -65,6 +84,23 @@
/* /sys/fs/btrfs/ entry */
static struct kset *btrfs_kset;
+void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
+{
+ kobject_del(&fs_info->super_kobj);
+ kobject_put(&fs_info->super_kobj);
+ wait_for_completion(&fs_info->kobj_unregister);
+}
+
+int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
+{
+ int error;
+
+ init_completion(&fs_info->kobj_unregister);
+ error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL,
+ "%pU", fs_info->fsid);
+ return error;
+}
+
int btrfs_init_sysfs(void)
{
int ret;