[Qemu-devel] [PATCH v3 11/22] qcow2: Set request_alignment during .bdrv_refresh_limits()

[Eric Blake <eblake@redhat.com>]

We want to eventually stick request_alignment alongside other
BlockLimits, but first, we must ensure it is populated at the
same time as all other limits, rather than being a special case
that is set only when a block is first opened.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>

---
v3: no change
v2: new patch
---
 block/qcow2.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/block/qcow2.c b/block/qcow2.c
index 23f666d..48f80b6 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -981,9 +981,6 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
         }

         bs->encrypted = 1;
-
-        /* Encryption works on a sector granularity */
-        bs->request_alignment = BDRV_SECTOR_SIZE;
     }

     s->l2_bits = s->cluster_bits - 3; /* L2 is always one cluster */
@@ -1202,6 +1199,10 @@ static void qcow2_refresh_limits(BlockDriverState *bs, Error **errp)
 {
     BDRVQcow2State *s = bs->opaque;

+    if (bs->encrypted) {
+        /* Encryption works on a sector granularity */
+        bs->request_alignment = BDRV_SECTOR_SIZE;
+    }
     bs->bl.pwrite_zeroes_alignment = s->cluster_size;
 }

-- 
2.5.5