commit 8243ccb7433e59a3faa3cca27fb6c40d6da2b37c
author Max Reitz <mreitz@redhat.com> Tue Jun 13 22:20:52 2017 +0200
committer Max Reitz <mreitz@redhat.com> Tue Jul 11 17:45:01 2017 +0200
tree 18ab94c4ea476c161f7c579c30e9203abb96afbc
parent 32a1681adc44f52e7c8a19408cd3be8452a0897b

block: Add PreallocMode to BD.bdrv_truncate()

Add a PreallocMode parameter to the bdrv_truncate() function implemented
by each block driver. Currently, we always pass PREALLOC_MODE_OFF and no
driver accepts anything else.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170613202107.10125-2-mreitz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>

block/qed.c

diff --git a/block/qed.c b/block/qed.c
index 385381a..8f7e45c 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -1342,12 +1342,19 @@
                           QED_AIOCB_WRITE | QED_AIOCB_ZERO);
 }
 
-static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
+static int bdrv_qed_truncate(BlockDriverState *bs, int64_t offset,
+                             PreallocMode prealloc, Error **errp)
 {
     BDRVQEDState *s = bs->opaque;
     uint64_t old_image_size;
     int ret;
 
+    if (prealloc != PREALLOC_MODE_OFF) {
+        error_setg(errp, "Unsupported preallocation mode '%s'",
+                   PreallocMode_lookup[prealloc]);
+        return -ENOTSUP;
+    }
+
     if (!qed_is_image_size_valid(offset, s->header.cluster_size,
                                  s->header.table_size)) {
         error_setg(errp, "Invalid image size specified");