Btrfs: Only open block devices once during mount -o subvol=



btrfs_open_devices needed a check to see if the device was already
open.

Signed-off-by: Chris Mason <chris.mason@oracle.com>

parent a68d5933

fs/btrfs/volumes.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -196,6 +196,9 @@ int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
		mutex_lock(&uuid_mutex);
		list_for_each(cur, head) {
		device = list_entry(cur, struct btrfs_device, dev_list);
		if (device->bdev)
		continue;

		bdev = open_bdev_excl(device->name, flags, holder);

		if (IS_ERR(bdev)) {