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Diffstat (limited to 'block/blkdebug.c')
-rw-r--r--block/blkdebug.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/block/blkdebug.c b/block/blkdebug.c
index b25856c49c..a9b03ff0a2 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -821,8 +821,15 @@ static int64_t blkdebug_getlength(BlockDriverState *bs)
     return bdrv_getlength(bs->file->bs);
 }
 
-static int blkdebug_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
+static int blkdebug_truncate(BlockDriverState *bs, int64_t offset,
+                             PreallocMode prealloc, Error **errp)
 {
+    if (prealloc != PREALLOC_MODE_OFF) {
+        error_setg(errp, "Unsupported preallocation mode '%s'",
+                   PreallocMode_lookup[prealloc]);
+        return -ENOTSUP;
+    }
+
     return bdrv_truncate(bs->file, offset, errp);
 }