diff mbox series

[Stable-7.2.11,23/41] migration: Skip only empty block devices

Message ID 20240410054416.4181891-23-mjt@tls.msk.ru
State New
Headers show
Series Patch Round-up for stable 7.2.11, freeze on 2024-04-20 | expand

Commit Message

Michael Tokarev April 10, 2024, 5:43 a.m. UTC 
From: Cédric Le Goater <clg@redhat.com>

The block .save_setup() handler calls a helper routine
init_blk_migration() which builds a list of block devices to take into
account for migration. When one device is found to be empty (sectors
== 0), the loop exits and all the remaining devices are ignored. This
is a regression introduced when bdrv_iterate() was removed.

Change that by skipping only empty devices.

Cc: Markus Armbruster <armbru@redhat.com>
Cc: qemu-stable <qemu-stable@nongnu.org>
Suggested-by: Kevin Wolf <kwolf@redhat.com>
Fixes: fea68bb6e9fa ("block: Eliminate bdrv_iterate(), use bdrv_next()")
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Link: https://lore.kernel.org/r/20240312120431.550054-1-clg@redhat.com
[peterx: fix "Suggested-by:"]
Signed-off-by: Peter Xu <peterx@redhat.com>
(cherry picked from commit 2e128776dc56f502c2ee41750afe83938f389528)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
diff mbox series

Patch

diff --git a/migration/block.c b/migration/block.c
index 4026b73f75..867901d2b1 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -415,7 +415,10 @@  static int init_blk_migration(QEMUFile *f)
         }
 
         sectors = bdrv_nb_sectors(bs);
-        if (sectors <= 0) {
+        if (sectors == 0) {
+            continue;
+        }
+        if (sectors < 0) {
             ret = sectors;
             bdrv_next_cleanup(&it);
             goto out;