btrfs-progs: Introduce btrfs_close_all_devices helper

If there is more than one fs_devices in fs_uuids list (like mkfs.btrfs
does), we need close them all before exit. Add a helper for that.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/volumes.c b/volumes.c
index f7462c5..ca50f1c 100644 (file)
--- a/volumes.c
+++ b/volumes.c
@@ -198,6 +198,17 @@ again:
        return 0;
 }
 
+void btrfs_close_all_devices(void)
+{
+       struct btrfs_fs_devices *fs_devices;
+
+       while (!list_empty(&fs_uuids)) {
+               fs_devices = list_entry(fs_uuids.next, struct btrfs_fs_devices,
+                                       list);
+               btrfs_close_devices(fs_devices);
+       }
+}
+
 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, int flags)
 {
        int fd;

diff --git a/volumes.h b/volumes.h
index 71d5d66..f776131 100644 (file)
--- a/volumes.h
+++ b/volumes.h
@@ -187,6 +187,7 @@ int btrfs_add_device(struct btrfs_trans_handle *trans,
 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
                       int flags);
 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
+void btrfs_close_all_devices(void);
 int btrfs_add_device(struct btrfs_trans_handle *trans,
                     struct btrfs_root *root,
                     struct btrfs_device *device);