From 1ff735bdc417945bc6df1857861b127644b3f461 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Thu, 5 Dec 2013 13:01:46 +0100
Subject: block: Detect unaligned length in bdrv_qiov_is_aligned()

For an O_DIRECT request to succeed, it's not only necessary that all
base addresses in the qiov are aligned, but also that each length in it
is aligned.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
---
 block.c | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'block.c')

diff --git a/block.c b/block.c
index 9d0cfc46da..275d387354 100644
--- a/block.c
+++ b/block.c
@@ -4811,6 +4811,9 @@ bool bdrv_qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov)
         if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) {
             return false;
         }
+        if (qiov->iov[i].iov_len % bs->buffer_alignment) {
+            return false;
+        }
     }
 
     return true;
-- 
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