commit 1ddaabaecb7eaeb6d8948a32340af95db44c54a1
author Kevin Wolf <kwolf@redhat.com> Fri Apr 24 14:54:43 2020 +0200
committer Kevin Wolf <kwolf@redhat.com> Thu Apr 30 17:51:07 2020 +0200
tree 5f782ff0a2e0ef06286aafb5ca471600dac9265a
parent f01643fb8b47e8a70c04bbf45e0f12a9e5bc54de

raw-format: Support BDRV_REQ_ZERO_WRITE for truncate

The raw format driver can simply forward the flag and let its bs->file
child take care of actually providing the zeros.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20200424125448.63318-6-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

block/raw-format.c

diff --git a/block/raw-format.c b/block/raw-format.c
index 3465c9a..351f2d9 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -387,7 +387,7 @@
 
     s->size = offset;
     offset += s->offset;
-    return bdrv_co_truncate(bs->file, offset, exact, prealloc, 0, errp);
+    return bdrv_co_truncate(bs->file, offset, exact, prealloc, flags, errp);
 }
 
 static void raw_eject(BlockDriverState *bs, bool eject_flag)
@@ -445,6 +445,8 @@
     bs->supported_zero_flags = BDRV_REQ_WRITE_UNCHANGED |
         ((BDRV_REQ_FUA | BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK) &
             bs->file->bs->supported_zero_flags);
+    bs->supported_truncate_flags = bs->file->bs->supported_truncate_flags &
+                                   BDRV_REQ_ZERO_WRITE;
 
     if (bs->probed && !bdrv_is_read_only(bs)) {
         bdrv_refresh_filename(bs->file->bs);