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/nfs.c

diff --git a/block/nfs.c b/block/nfs.c
index c3c5de0..c396ee1 100644
--- a/block/nfs.c
+++ b/block/nfs.c
@@ -759,11 +759,18 @@
     return (task.ret < 0 ? task.ret : st.st_blocks * 512);
 }
 
-static int nfs_file_truncate(BlockDriverState *bs, int64_t offset, Error **errp)
+static int nfs_file_truncate(BlockDriverState *bs, int64_t offset,
+                             PreallocMode prealloc, Error **errp)
 {
     NFSClient *client = bs->opaque;
     int ret;
 
+    if (prealloc != PREALLOC_MODE_OFF) {
+        error_setg(errp, "Unsupported preallocation mode '%s'",
+                   PreallocMode_lookup[prealloc]);
+        return -ENOTSUP;
+    }
+
     ret = nfs_ftruncate(client->context, client->fh, offset);
     if (ret < 0) {
         error_setg_errno(errp, -ret, "Failed to truncate file");