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| author | Peter Maydell <peter.maydell@linaro.org> | 2016-08-18 14:42:51 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2016-08-18 14:42:51 +0100 |
| commit | 02b1ad881cbb1795029737a9077db60267dc0c6f (patch) | |
| tree | cb957f9d06a1dcd3591dc4a19b03edfe0018ff97 | |
| parent | 5844365fe8e5e4598222d276d2af54fd45c7e3d3 (diff) | |
| parent | 156af3ac98da24f0155eed18ec546157436d6b2e (diff) | |
| download | qemu-02b1ad881cbb1795029737a9077db60267dc0c6f.tar.gz | |
Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging
# gpg: Signature made Thu 18 Aug 2016 14:39:31 BST
# gpg: using RSA key 0x9CA4ABB381AB73C8
# gpg: Good signature from "Stefan Hajnoczi <stefanha@redhat.com>"
# gpg: aka "Stefan Hajnoczi <stefanha@gmail.com>"
# Primary key fingerprint: 8695 A8BF D3F9 7CDA AC35 775A 9CA4 ABB3 81AB 73C8
* remotes/stefanha/tags/block-pull-request:
block: fix possible reorder of flush operations
block: fix deadlock in bdrv_co_flush
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
| -rw-r--r-- | block/io.c | 8 | ||||
| -rw-r--r-- | include/block/block_int.h | 2 |
2 files changed, 6 insertions, 4 deletions
diff --git a/block/io.c b/block/io.c index d5493ba349..420944d80d 100644 --- a/block/io.c +++ b/block/io.c @@ -2283,11 +2283,11 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs) int current_gen = bs->write_gen; /* Wait until any previous flushes are completed */ - while (bs->flush_started_gen != bs->flushed_gen) { + while (bs->active_flush_req != NULL) { qemu_co_queue_wait(&bs->flush_queue); } - bs->flush_started_gen = current_gen; + bs->active_flush_req = &req; /* Write back all layers by calling one driver function */ if (bs->drv->bdrv_co_flush) { @@ -2357,7 +2357,9 @@ flush_parent: out: /* Notify any pending flushes that we have completed */ bs->flushed_gen = current_gen; - qemu_co_queue_restart_all(&bs->flush_queue); + bs->active_flush_req = NULL; + /* Return value is ignored - it's ok if wait queue is empty */ + qemu_co_queue_next(&bs->flush_queue); tracked_request_end(&req); return ret; diff --git a/include/block/block_int.h b/include/block/block_int.h index 47665be81e..1e939de4fe 100644 --- a/include/block/block_int.h +++ b/include/block/block_int.h @@ -443,8 +443,8 @@ struct BlockDriverState { note this is a reference count */ CoQueue flush_queue; /* Serializing flush queue */ + BdrvTrackedRequest *active_flush_req; /* Flush request in flight */ unsigned int write_gen; /* Current data generation */ - unsigned int flush_started_gen; /* Generation for which flush has started */ unsigned int flushed_gen; /* Flushed write generation */ BlockDriver *drv; /* NULL means no media */ |