File _service:tar_scm:migration-Skip-only-empty-bloc... of Package qemu

File _service:tar_scm:migration-Skip-only-empty-block-devicesi.patch of Package qemu

From 4506b31c0fff0b7a69ec4c7e264715ed70df75a8 Mon Sep 17 00:00:00 2001
From: gaojiazhen <gaojiazhen_yewu@cmss.chinamobile.com>
Date: Mon, 25 Mar 2024 22:13:43 +0800
Subject: [PATCH] migration: Skip only empty block devicesi
MIME-Version: 1.0
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cheery-pick from 2e128776dc56f502c2ee41750afe83938f389528

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: fea68bb ("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>
Signed-off-by: Gao Jiazhen <gaojiazhen_yewu@cmss.chinamobile.com>
---
 migration/block.c          | 5 ++++-
 tests/qemu-iotests/198.out | 2 --
 tests/qemu-iotests/206.out | 1 -
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/migration/block.c b/migration/block.c
index a15f9bddcb..710ef6f490 100644
--- a/migration/block.c
+++ b/migration/block.c
@@ -409,7 +409,10 @@ 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;
diff --git a/tests/qemu-iotests/198.out b/tests/qemu-iotests/198.out
index 62fb73fa3e..805494916f 100644
--- a/tests/qemu-iotests/198.out
+++ b/tests/qemu-iotests/198.out
@@ -39,7 +39,6 @@ Format specific information:
     compression type: COMPRESSION_TYPE
     encrypt:
         ivgen alg: plain64
-        detached header: false
         hash alg: sha256
         cipher alg: aes-256
         uuid: 00000000-0000-0000-0000-000000000000
@@ -85,7 +84,6 @@ Format specific information:
     compression type: COMPRESSION_TYPE
     encrypt:
         ivgen alg: plain64
-        detached header: false
         hash alg: sha256
         cipher alg: aes-256
         uuid: 00000000-0000-0000-0000-000000000000
diff --git a/tests/qemu-iotests/206.out b/tests/qemu-iotests/206.out
index 979f00f9bf..7e95694777 100644
--- a/tests/qemu-iotests/206.out
+++ b/tests/qemu-iotests/206.out
@@ -114,7 +114,6 @@ Format specific information:
     refcount bits: 16
     encrypt:
         ivgen alg: plain64
-        detached header: false
         hash alg: sha1
         cipher alg: aes-128
         uuid: XXXXXXXX-XXXX-XXXX-XXXX-XXXXXXXXXXXX
-- 
2.27.0