Patchwork [2/2] qcow2: lock on prealloc

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Submitter Zhiyong Wu
Date May 5, 2012, 3:13 a.m.
Message ID <1336187606-27365-1-git-send-email-zwu.kernel@gmail.com>
Download mbox | patch
Permalink /patch/157023/
State New
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Zhiyong Wu - May 5, 2012, 3:13 a.m.
From: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>

Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
---
 block/qcow2.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

Patch

diff --git a/block/qcow2.c b/block/qcow2.c
index 8c60a6f..ee4678f 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1192,7 +1192,10 @@  static int qcow2_create2(const char *filename, int64_t total_size,
 
     /* And if we're supposed to preallocate metadata, do that now */
     if (prealloc) {
+        BDRVQcowState *s = bs->opaque;
+        qemu_co_mutex_lock(&s->lock);
         ret = preallocate(bs);
+        qemu_co_mutex_unlock(&s->lock);
         if (ret < 0) {
             goto out;
         }