btrfs: convert to using bdi_setup_and_register()

It's now a provided helper, so get rid of the internal setup
and btrfs atomic_t bdi enumerator.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e7b8f2c89ccb23555a81df04249f8f5f14e32f75..feca04197d028e9d25a73dd177299319e1af351d 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -44,8 +44,6 @@ static struct extent_io_ops btree_extent_io_ops;
 static void end_workqueue_fn(struct btrfs_work *work);
 static void free_fs_root(struct btrfs_root *root);
 
-static atomic_t btrfs_bdi_num = ATOMIC_INIT(0);
-
 /*
  * end_io_wq structs are used to do processing in task context when an IO is
  * complete.  This is used during reads to verify checksums, and it is used
@@ -1375,19 +1373,11 @@ static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi)
 {
        int err;
 
-       bdi->name = "btrfs";
        bdi->capabilities = BDI_CAP_MAP_COPY;
-       err = bdi_init(bdi);
+       err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY);
        if (err)
                return err;
 
-       err = bdi_register(bdi, NULL, "btrfs-%d",
-                               atomic_inc_return(&btrfs_bdi_num));
-       if (err) {
-               bdi_destroy(bdi);
-               return err;
-       }
-
        bdi->ra_pages   = default_backing_dev_info.ra_pages;
        bdi->unplug_io_fn       = btrfs_unplug_io_fn;
        bdi->unplug_io_data     = info;