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[Qemu-block] [PATCH v2 04/13] blockdev: Lock BDS during external snapsho


From: Fam Zheng
Subject: [Qemu-block] [PATCH v2 04/13] blockdev: Lock BDS during external snapshot transaction
Date: Tue, 2 Jun 2015 11:21:53 +0800

Lock immediately follows aio_context_acquire, so unlock right before
the corresponding aio_context_release.

Signed-off-by: Fam Zheng <address@hidden>
---
 blockdev.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/blockdev.c b/blockdev.c
index fdc5a17..a8d5b10 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1471,6 +1471,7 @@ static void external_snapshot_prepare(BlkTransactionState 
*common,
     /* Acquire AioContext now so any threads operating on old_bs stop */
     state->aio_context = bdrv_get_aio_context(state->old_bs);
     aio_context_acquire(state->aio_context);
+    bdrv_lock(state->old_bs);
 
     if (!bdrv_is_inserted(state->old_bs)) {
         error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
@@ -1540,6 +1541,7 @@ static void external_snapshot_commit(BlkTransactionState 
*common)
     bdrv_reopen(state->new_bs, state->new_bs->open_flags & ~BDRV_O_RDWR,
                 NULL);
 
+    bdrv_unlock(state->old_bs);
     aio_context_release(state->aio_context);
 }
 
@@ -1551,6 +1553,7 @@ static void external_snapshot_abort(BlkTransactionState 
*common)
         bdrv_unref(state->new_bs);
     }
     if (state->aio_context) {
+        bdrv_unlock(state->old_bs);
         aio_context_release(state->aio_context);
     }
 }
-- 
2.4.1




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