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[PATCHv2,4/4] block: avoid creating oversized writes in multiwrite_merge

Message ID 1410520912-7557-5-git-send-email-pl@kamp.de
State New
Headers show

Commit Message

Peter Lieven Sept. 12, 2014, 11:21 a.m. UTC 
Signed-off-by: Peter Lieven <pl@kamp.de>
Reviewed-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
---
 block.c |    5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/block.c b/block.c
index 965e9bc..2b9be99 100644
--- a/block.c
+++ b/block.c
@@ -4554,6 +4554,11 @@  static int multiwrite_merge(BlockDriverState *bs, BlockRequest *reqs,
             merge = 0;
         }
 
+        if (bs->bl.max_transfer_length && reqs[outidx].nb_sectors +
+            reqs[i].nb_sectors > bs->bl.max_transfer_length) {
+            merge = 0;
+        }
+
         if (merge) {
             size_t size;
             QEMUIOVector *qiov = g_malloc0(sizeof(*qiov));