btrfs: sysfs, add UUID/devinfo kobject

Create directory /sys/fs/btrfs/UUID/devinfo to hold devices directories
by the id (unlike /devices).

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 7436422..6bac61c 100644 (file)
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -901,6 +901,12 @@ static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
 
 static void __btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
 {
+       if (fs_devs->devinfo_kobj) {
+               kobject_del(fs_devs->devinfo_kobj);
+               kobject_put(fs_devs->devinfo_kobj);
+               fs_devs->devinfo_kobj = NULL;
+       }
+
        if (fs_devs->devices_kobj) {
                kobject_del(fs_devs->devices_kobj);
                kobject_put(fs_devs->devices_kobj);
@@ -1369,6 +1375,15 @@ int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs)
                return -ENOMEM;
        }
 
+       fs_devs->devinfo_kobj = kobject_create_and_add("devinfo",
+                                                      &fs_devs->fsid_kobj);
+       if (!fs_devs->devinfo_kobj) {
+               btrfs_err(fs_devs->fs_info,
+                         "failed to init sysfs devinfo kobject");
+               btrfs_sysfs_remove_fsid(fs_devs);
+               return -ENOMEM;
+       }
+
        return 0;
 }
 

diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
index 690d4f5..309cda4 100644 (file)
--- a/fs/btrfs/volumes.h
+++ b/fs/btrfs/volumes.h
@@ -258,6 +258,7 @@ struct btrfs_fs_devices {
        /* sysfs kobjects */
        struct kobject fsid_kobj;
        struct kobject *devices_kobj;
+       struct kobject *devinfo_kobj;
        struct completion kobj_unregister;
 };