[Qemu-devel] [PATCH 2/2] qcow2: Translate -ERANGE to -ENOSPC

[Fam Zheng <famz@redhat.com>]

This will make the default werror (=enospc) work better when qcow2 is
created on top of iscsi or other block devices.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 block/qcow2.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/block/qcow2.c b/block/qcow2.c
index bacc4f2..8edf0fe 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1586,6 +1586,12 @@ static coroutine_fn int qcow2_co_writev(BlockDriverState *bs,
                              cur_nr_sectors, &hd_qiov);
         qemu_co_mutex_lock(&s->lock);
         if (ret < 0) {
+            if (ret == -ERANGE) {
+                /* Out of range access means we're already allocating clusters
+                 * beyond end of disk, fix the error code to support
+                 * werror=enospc. */
+                ret = -ENOSPC;
+            }
             goto fail;
         }
 
-- 
2.4.3