[Qemu-devel] [PATCH 05/11] vvfat: make it thread-safe

From: Paolo Bonzini <pbonzini@redhat.com>
To: qemu-devel@nongnu.org
Cc: kwolf@redhat.com, famz@redhat.com, qemu-block@nongnu.org,
	mreitz@redhat.com
Subject: [Qemu-devel] [PATCH 05/11] vvfat: make it thread-safe
Date: Wed, 31 May 2017 11:43:24 +0200	[thread overview]
Message-ID: <20170531094330.1808-6-pbonzini@redhat.com> (raw)
In-Reply-To: <20170531094330.1808-1-pbonzini@redhat.com>

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 block/vvfat.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/block/vvfat.c b/block/vvfat.c
index 9c82371360..457b73a35c 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -2983,8 +2983,14 @@ static int coroutine_fn
 write_target_commit(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
                     QEMUIOVector *qiov, int flags)
 {
+    int ret;
+
     BDRVVVFATState* s = *((BDRVVVFATState**) bs->opaque);
-    return try_commit(s);
+    qemu_co_mutex_lock(&s->lock);
+    ret = try_commit(s);
+    qemu_co_mutex_unlock(&s->lock);
+
+    return ret;
 }
 
 static void write_target_close(BlockDriverState *bs) {
-- 
2.13.0
