btrfs: sysfs, rename devices kobject holder to devices_kobj

The struct member btrfs_device::device_dir_kobj holds the kobj of the
sysfs directory /sys/fs/btrfs/UUID/devices, so rename it from
device_dir_kobj to devices_kobj. No functional changes.
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/sysfs.c

@@ -734,10 +734,10 @@ 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->device_dir_kobj) {
-		kobject_del(fs_devs->device_dir_kobj);
-		kobject_put(fs_devs->device_dir_kobj);
-		fs_devs->device_dir_kobj = NULL;
+	if (fs_devs->devices_kobj) {
+		kobject_del(fs_devs->devices_kobj);
+		kobject_put(fs_devs->devices_kobj);
+		fs_devs->devices_kobj = NULL;
 	}
 
 	if (fs_devs->fsid_kobj.state_initialized) {
@@ -969,15 +969,14 @@ int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
 	struct hd_struct *disk;
 	struct kobject *disk_kobj;
 
-	if (!fs_devices->device_dir_kobj)
+	if (!fs_devices->devices_kobj)
 		return -EINVAL;
 
 	if (one_device && one_device->bdev) {
 		disk = one_device->bdev->bd_part;
 		disk_kobj = &part_to_dev(disk)->kobj;
 
-		sysfs_remove_link(fs_devices->device_dir_kobj,
-						disk_kobj->name);
+		sysfs_remove_link(fs_devices->devices_kobj, disk_kobj->name);
 	}
 
 	if (one_device)
@@ -990,8 +989,7 @@ int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
 		disk = one_device->bdev->bd_part;
 		disk_kobj = &part_to_dev(disk)->kobj;
 
-		sysfs_remove_link(fs_devices->device_dir_kobj,
-						disk_kobj->name);
+		sysfs_remove_link(fs_devices->devices_kobj, disk_kobj->name);
 	}
 
 	return 0;
@@ -999,11 +997,11 @@ int btrfs_sysfs_rm_device_link(struct btrfs_fs_devices *fs_devices,
 
 int btrfs_sysfs_add_device(struct btrfs_fs_devices *fs_devs)
 {
-	if (!fs_devs->device_dir_kobj)
-		fs_devs->device_dir_kobj = kobject_create_and_add("devices",
+	if (!fs_devs->devices_kobj)
+		fs_devs->devices_kobj = kobject_create_and_add("devices",
 							&fs_devs->fsid_kobj);
 
-	if (!fs_devs->device_dir_kobj)
+	if (!fs_devs->devices_kobj)
 		return -ENOMEM;
 
 	return 0;
@@ -1028,7 +1026,7 @@ int btrfs_sysfs_add_device_link(struct btrfs_fs_devices *fs_devices,
 		disk = dev->bdev->bd_part;
 		disk_kobj = &part_to_dev(disk)->kobj;
 
-		error = sysfs_create_link(fs_devices->device_dir_kobj,
+		error = sysfs_create_link(fs_devices->devices_kobj,
 					  disk_kobj, disk_kobj->name);
 		if (error)
 			break;

fs/btrfs/volumes.h

@@ -255,7 +255,7 @@ struct btrfs_fs_devices {
 	struct btrfs_fs_info *fs_info;
 	/* sysfs kobjects */
 	struct kobject fsid_kobj;
-	struct kobject *device_dir_kobj;
+	struct kobject *devices_kobj;
 	struct completion kobj_unregister;
 };