[Qemu-devel] [PATCH 3/3] block: process before_write_notifiers in bdrv_co_discard

["Denis V. Lunev" <den@openvz.org>]

This is mandatory for correct backup creation. In the other case the
content under this area would be lost.

Dirty bits are set exactly like in bdrv_aligned_pwritev, i.e. they are set
even if notifier has returned a error.

Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Vladimir Sementsov-Ogievskiy<vsementsov@virtuozzo.com>
CC: Stefan Hajnoczi <stefanha@redhat.com>
CC: Fam Zheng <famz@redhat.com>
CC: Kevin Wolf <kwolf@redhat.com>
CC: Max Reitz <mreitz@redhat.com>
---
 block/io.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/block/io.c b/block/io.c
index 513bd99..92d9fe3 100644
--- a/block/io.c
+++ b/block/io.c
@@ -2266,6 +2266,11 @@ int coroutine_fn bdrv_co_discard(BlockDriverState *bs, int64_t sector_num,
     tracked_request_begin(&req, bs, NULL, sector_num << BDRV_SECTOR_BITS,
                           nb_sectors << BDRV_SECTOR_BITS, BDRV_TRACKED_DISCARD);
 
+    ret = notifier_with_return_list_notify(&bs->before_write_notifiers, &req);
+    if (ret < 0) {
+        goto out;
+    }
+
     max_discard = MIN_NON_ZERO(bs->bl.max_discard, BDRV_REQUEST_MAX_SECTORS);
     while (nb_sectors > 0) {
         int ret;
-- 
2.5.0