[sheepdog] [PATCH v2 2/2] sheepdog: improve error handling for a case of failed lock

[Hitoshi Mitake]

Recently, sheepdog revived its VDI locking functionality. This patch
updates sheepdog driver of QEMU for this feature. It changes an error
code for a case of failed locking. -EBUSY is a suitable one.

Reported-by: Valerio Pachera <sirio81 at gmail.com>
Cc: Kevin Wolf <kwolf at redhat.com>
Cc: Stefan Hajnoczi <stefanha at redhat.com>
Cc: Liu Yuan <namei.unix at gmail.com>
Cc: MORITA Kazutaka <morita.kazutaka at gmail.com>
Signed-off-by: Hitoshi Mitake <mitake.hitoshi at lab.ntt.co.jp>
---
v2:
 - don't handle SD_RES_VDI_NOT_LOCKED as a special case

 block/sheepdog.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/sheepdog.c b/block/sheepdog.c
index 36f76f0..f08182d 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -1115,6 +1115,8 @@ static int find_vdi_name(BDRVSheepdogState *s, const char *filename,
                    sd_strerror(rsp->result), filename, snapid, tag);
         if (rsp->result == SD_RES_NO_VDI) {
             ret = -ENOENT;
+        } else if (rsp->result == SD_RES_VDI_LOCKED) {
+            ret = -EBUSY;
         } else {
             ret = -EIO;
         }
-- 
1.8.3.2