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Re: [PATCH] blockcommit: Reopen base image as RO after abort


From: Alexander Ivanov
Subject: Re: [PATCH] blockcommit: Reopen base image as RO after abort
Date: Mon, 25 Dec 2023 12:04:25 +0100
User-agent: Mozilla Thunderbird

Ping. Could someone please review the code?

On 11/30/23 11:11, Alexander Ivanov wrote:
If a blockcommit is aborted the base image remains in RW mode, that leads
to a fail of subsequent live migration.

How to reproduce:
   $ virsh snapshot-create-as vm snp1 --disk-only

   *** write something to the disk ***

   $ virsh blockcommit vm vda --active --shallow && virsh blockjob vm vda 
--abort
   $ lsof /vzt/vm.qcow2
   COMMAND      PID USER   FD   TYPE DEVICE   SIZE/OFF NODE NAME
   qemu-syst 433203 root   45u   REG  253,0 1724776448  133 /vzt/vm.qcow2
   $ cat /proc/433203/fdinfo/45
   pos:    0
   flags:  02140002

Reopen the base image in RO mode in mirror_exit_common() if the blockjob
is aborted.

Signed-off-by: Alexander Ivanov <alexander.ivanov@virtuozzo.com>
---
  block/mirror.c | 4 ++++
  1 file changed, 4 insertions(+)

diff --git a/block/mirror.c b/block/mirror.c
index dcd88de2e3..50a2825b1c 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -789,6 +789,10 @@ static int mirror_exit_common(Job *job)
      block_job_remove_all_bdrv(bjob);
      bdrv_replace_node(mirror_top_bs, mirror_top_bs->backing->bs, 
&error_abort);
+ if (abort && !bdrv_is_read_only(target_bs)) {
+        bdrv_reopen_set_read_only(target_bs, true, NULL);
+    }
+
      bs_opaque->job = NULL;
bdrv_drained_end(src);

--
Best regards,
Alexander Ivanov




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