Btrfs: sysfs: reorder the kobject creations

As of now the order in which the kobjects are created
at btrfs_sysfs_add_one() is..
 fsid
 features
 unknown features (dynamic features)
 devices.

Since we would move fsid and device kobject to fs_devices
from fs_info structure, this patch will reorder in which
the kobjects are created as below.
 fsid
 devices
 features
 unknown features (dynamic features)

And hence the btrfs_sysfs_remove_one() will follow the same
in reverse order. and the device kobject destroy now can
be moved into the function __btrfs_sysfs_remove_one()

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

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 6218d31..8eb2463 100644 (file)
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -510,6 +510,13 @@ static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add)
 
 static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
 {
+       if (fs_info->device_dir_kobj) {
+               btrfs_kobj_rm_device(fs_info, NULL);
+               kobject_del(fs_info->device_dir_kobj);
+               kobject_put(fs_info->device_dir_kobj);
+               fs_info->device_dir_kobj = NULL;
+       }
+
        kobject_del(&fs_info->super_kobj);
        kobject_put(&fs_info->super_kobj);
        wait_for_completion(&fs_info->kobj_unregister);
@@ -522,12 +529,6 @@ void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info)
                kobject_del(fs_info->space_info_kobj);
                kobject_put(fs_info->space_info_kobj);
        }
-       if (fs_info->device_dir_kobj) {
-               btrfs_kobj_rm_device(fs_info, NULL);
-               kobject_del(fs_info->device_dir_kobj);
-               kobject_put(fs_info->device_dir_kobj);
-               fs_info->device_dir_kobj = NULL;
-       }
        addrm_unknown_feature_attrs(fs_info, false);
        sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group);
        __btrfs_sysfs_remove_one(fs_info);
@@ -700,6 +701,12 @@ int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
        if (error)
                return error;
 
+       error = btrfs_kobj_add_device(fs_info, NULL);
+       if (error) {
+               __btrfs_sysfs_remove_one(fs_info);
+               return error;
+       }
+
        error = sysfs_create_group(&fs_info->super_kobj,
                                   &btrfs_feature_attr_group);
        if (error) {
@@ -711,10 +718,6 @@ int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info)
        if (error)
                goto failure;
 
-       error = btrfs_kobj_add_device(fs_info, NULL);
-       if (error)
-               goto failure;
-
        fs_info->space_info_kobj = kobject_create_and_add("allocation",
                                                  &fs_info->super_kobj);
        if (!fs_info->space_info_kobj) {