btrfs: split and refactor btrfs_sysfs_remove_devices_dir

Similar to btrfs_sysfs_add_devices_dir()'s refactoring, split
btrfs_sysfs_remove_devices_dir() so that we don't have to use the device
argument to indicate whether to free all devices or just one device.

Export btrfs_sysfs_remove_device() as device operations outside of
sysfs.c now calls this instead of btrfs_sysfs_remove_devices_dir().

btrfs_sysfs_remove_devices_dir() is renamed to
btrfs_sysfs_remove_fs_devices() to suite its new role.

Now, no one outside of sysfs.c calls btrfs_sysfs_remove_fs_devices()
so it is redeclared s static. And the same function had to be moved
before its first caller.
Reviewed-by: Nikolay Borisov <nborisov@suse.com>
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/dev-replace.c

@@ -781,7 +781,7 @@ static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info,
 	mutex_unlock(&fs_info->fs_devices->device_list_mutex);
 
 	/* replace the sysfs entry */
-	btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, src_device);
+	btrfs_sysfs_remove_device(src_device);
 	btrfs_sysfs_update_devid(tgt_device);
 	if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &src_device->dev_state))
 		btrfs_scratch_superblocks(fs_info, src_device->bdev,

fs/btrfs/sysfs.c

@@ -972,6 +972,14 @@ void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs)
 	}
 }
 
+static void btrfs_sysfs_remove_fs_devices(struct btrfs_fs_devices *fs_devices)
+{
+	struct btrfs_device *device;
+
+	list_for_each_entry(device, &fs_devices->devices, dev_list)
+		btrfs_sysfs_remove_device(device);
+}
+
 void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
 {
 	struct kobject *fsid_kobj = &fs_info->fs_devices->fsid_kobj;
@@ -999,7 +1007,7 @@ void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info)
 	addrm_unknown_feature_attrs(fs_info, false);
 	sysfs_remove_group(fsid_kobj, &btrfs_feature_attr_group);
 	sysfs_remove_files(fsid_kobj, btrfs_attrs);
-	btrfs_sysfs_remove_devices_dir(fs_info->fs_devices, NULL);
+	btrfs_sysfs_remove_fs_devices(fs_info->fs_devices);
 }
 
 static const char * const btrfs_feature_set_names[FEAT_MAX] = {
@@ -1186,7 +1194,7 @@ int btrfs_sysfs_add_space_info_type(struct btrfs_fs_info *fs_info,
 	return 0;
 }
 
-static void btrfs_sysfs_remove_device(struct btrfs_device *device)
+void btrfs_sysfs_remove_device(struct btrfs_device *device)
 {
 	struct hd_struct *disk;
 	struct kobject *disk_kobj;
@@ -1212,19 +1220,6 @@ static void btrfs_sysfs_remove_device(struct btrfs_device *device)
 	}
 }
 
-/* When @device is NULL, remove all devices link */
-void btrfs_sysfs_remove_devices_dir(struct btrfs_fs_devices *fs_devices,
-				    struct btrfs_device *device)
-{
-	if (device) {
-		btrfs_sysfs_remove_device(device);
-		return;
-	}
-
-	list_for_each_entry(device, &fs_devices->devices, dev_list)
-		btrfs_sysfs_remove_device(device);
-}
-
 static ssize_t btrfs_devinfo_in_fs_metadata_show(struct kobject *kobj,
 					         struct kobj_attribute *a,
 					         char *buf)
@@ -1459,7 +1454,7 @@ int btrfs_sysfs_add_mounted(struct btrfs_fs_info *fs_info)
 
 	error = sysfs_create_files(fsid_kobj, btrfs_attrs);
 	if (error) {
-		btrfs_sysfs_remove_devices_dir(fs_devs, NULL);
+		btrfs_sysfs_remove_fs_devices(fs_devs);
 		return error;
 	}
 

fs/btrfs/sysfs.h

@@ -15,8 +15,7 @@ enum btrfs_feature_set {
 char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags);
 const char *btrfs_feature_set_name(enum btrfs_feature_set set);
 int btrfs_sysfs_add_device(struct btrfs_device *device);
-void btrfs_sysfs_remove_devices_dir(struct btrfs_fs_devices *fs_devices,
-				    struct btrfs_device *device);
+void btrfs_sysfs_remove_device(struct btrfs_device *device);
 int btrfs_sysfs_add_fsid(struct btrfs_fs_devices *fs_devs);
 void btrfs_sysfs_remove_fsid(struct btrfs_fs_devices *fs_devs);
 void btrfs_sysfs_update_sprout_fsid(struct btrfs_fs_devices *fs_devices);

fs/btrfs/volumes.c

@@ -2041,7 +2041,7 @@ void btrfs_scratch_superblocks(struct btrfs_fs_info *fs_info,
 }
 
 int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
-		u64 devid)
+		    u64 devid)
 {
 	struct btrfs_device *device;
 	struct btrfs_fs_devices *cur_devices;
@@ -2145,7 +2145,7 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info, const char *device_path,
 	if (device->bdev) {
 		cur_devices->open_devices--;
 		/* remove sysfs entry */
-		btrfs_sysfs_remove_devices_dir(fs_devices, device);
+		btrfs_sysfs_remove_device(device);
 	}
 
 	num_devices = btrfs_super_num_devices(fs_info->super_copy) - 1;
@@ -2246,7 +2246,7 @@ void btrfs_destroy_dev_replace_tgtdev(struct btrfs_device *tgtdev)
 
 	mutex_lock(&fs_devices->device_list_mutex);
 
-	btrfs_sysfs_remove_devices_dir(fs_devices, tgtdev);
+	btrfs_sysfs_remove_device(tgtdev);
 
 	if (tgtdev->bdev)
 		fs_devices->open_devices--;
@@ -2682,7 +2682,7 @@ int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path
 	return ret;
 
 error_sysfs:
-	btrfs_sysfs_remove_devices_dir(fs_devices, device);
+	btrfs_sysfs_remove_device(device);
 	mutex_lock(&fs_info->fs_devices->device_list_mutex);
 	mutex_lock(&fs_info->chunk_mutex);
 	list_del_rcu(&device->dev_list);