block: Rename BlockDriverCompletionFunc to BlockCompletionFunc

I'll use it with block backends shortly, and the name is going to fit
badly there.  It's a block layer thing anyway, not just a block driver
thing.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
diff --git a/block/quorum.c b/block/quorum.c
index e173ef0..437b122 100644
--- a/block/quorum.c
+++ b/block/quorum.c
@@ -186,7 +186,7 @@
                                    QEMUIOVector *qiov,
                                    uint64_t sector_num,
                                    int nb_sectors,
-                                   BlockDriverCompletionFunc *cb,
+                                   BlockCompletionFunc *cb,
                                    void *opaque)
 {
     QuorumAIOCB *acb = qemu_aio_get(&quorum_aiocb_info, bs, cb, opaque);
@@ -679,7 +679,7 @@
                                     int64_t sector_num,
                                     QEMUIOVector *qiov,
                                     int nb_sectors,
-                                    BlockDriverCompletionFunc *cb,
+                                    BlockCompletionFunc *cb,
                                     void *opaque)
 {
     BDRVQuorumState *s = bs->opaque;
@@ -700,7 +700,7 @@
                                      int64_t sector_num,
                                      QEMUIOVector *qiov,
                                      int nb_sectors,
-                                     BlockDriverCompletionFunc *cb,
+                                     BlockCompletionFunc *cb,
                                      void *opaque)
 {
     BDRVQuorumState *s = bs->opaque;