ceph: name bdi ceph-%d instead of major:minor

The bdi_setup_and_register() helper doesn't help us since we bdi_init() in
create_client() and bdi_register() only when sget() succeeds.

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/fs/ceph/super.c b/fs/ceph/super.c
index 34b16cb..7f5b20d 100644 (file)
--- a/fs/ceph/super.c
+++ b/fs/ceph/super.c
@@ -910,6 +910,8 @@ static int ceph_compare_super(struct super_block *sb, void *data)
 /*
  * construct our own bdi so we can control readahead, etc.
  */
+static atomic_long_t bdi_seq = ATOMIC_INIT(0);
+
 static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
 {
        int err;
@@ -919,7 +921,8 @@ static int ceph_register_bdi(struct super_block *sb, struct ceph_client *client)
                client->backing_dev_info.ra_pages =
                        (client->mount_args->rsize + PAGE_CACHE_SIZE - 1)
                        >> PAGE_SHIFT;
-       err = bdi_register_dev(&client->backing_dev_info, sb->s_dev);
+       err = bdi_register(&client->backing_dev_info, NULL, "ceph-%d",
+                          atomic_long_inc_return(&bdi_seq));
        if (!err)
                sb->s_bdi = &client->backing_dev_info;
        return err;