[Qemu-devel] [RFC PATCH 09/10] qed: honor BDRV_O_INCOMING for incoming live migration

["Benoît Canet" <benoit.canet@gmail.com>]

>From original commit is Patchwork-id: 31108 by
Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

"The QED image format includes a file header bit to mark images dirty.
QED normally checks dirty images on open and fixes inconsistent
metadata.  This is undesirable during live migration since the dirty bit
may be set if the source host is modifying the image file.  The check
should be postponed until migration completes.

Skip operations that modify the image file if the BDRV_O_INCOMING flag
is set."

Signed-off-by: Benoit Canet <benoit.canet@gmail.com>
---
 block/qed.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/block/qed.c b/block/qed.c
index f6300af..4bfda24 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -378,7 +378,8 @@ static int check_image_if_needed(BlockDriverState *bs)
          * potentially inconsistent images to be opened read-only.  This can
          * aid data recovery from an otherwise inconsistent image.
          */
-        if (!bdrv_is_read_only(bs->file)) {
+        if (!bdrv_is_read_only(bs->file) &&
+            !(bs->open_flags & BDRV_O_INCOMING)) {
             BdrvCheckResult result = {0};
 
             ret = qed_check(s, &result, true);
@@ -481,7 +482,7 @@ static int bdrv_qed_open(BlockDriverState *bs, int flags)
      * feature is no longer valid.
      */
     if ((s->header.autoclear_features & ~QED_AUTOCLEAR_FEATURE_MASK) != 0 &&
-        !bdrv_is_read_only(bs->file)) {
+        !bdrv_is_read_only(bs->file) && !(flags & BDRV_O_INCOMING)) {
         s->header.autoclear_features &= QED_AUTOCLEAR_FEATURE_MASK;
 
         ret = qed_write_header_sync(s);
-- 
1.7.7.6