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-rw-r--r--block/rbd.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/block/rbd.c b/block/rbd.c
index 9da02cdceb..9151d5caa6 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -936,11 +936,18 @@ static int64_t qemu_rbd_getlength(BlockDriverState *bs)
     return info.size;
 }
 
-static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
+static int qemu_rbd_truncate(BlockDriverState *bs, int64_t offset,
+                             PreallocMode prealloc, Error **errp)
 {
     BDRVRBDState *s = bs->opaque;
     int r;
 
+    if (prealloc != PREALLOC_MODE_OFF) {
+        error_setg(errp, "Unsupported preallocation mode '%s'",
+                   PreallocMode_lookup[prealloc]);
+        return -ENOTSUP;
+    }
+
     r = rbd_resize(s->image, offset);
     if (r < 0) {
         error_setg_errno(errp, -r, "Failed to resize file");