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[for-2.6,3/3] block: Update comment of bdrv_drained_begin

Message ID 1461306907-2837-4-git-send-email-famz@redhat.com (mailing list archive)
State New, archived
Headers show

Commit Message

Fam Zheng April 22, 2016, 6:35 a.m. UTC 
The limitation should be documented. Removing it is a post 2.6
material.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 include/block/block.h | 5 +++++
 1 file changed, 5 insertions(+)
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Patch

diff --git a/include/block/block.h b/include/block/block.h
index 3a73137..bb67652 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -530,6 +530,11 @@  void bdrv_flush_io_queue(BlockDriverState *bs);
  * this doesn't block timers or coroutines from submitting more requests, which
  * means block_job_pause is still necessary.
  *
+ * for now this only affacts the aio event loops (namely the data-plane
+ * iothreads and nested aio_poll() calls in block layer).  Specifically, the
+ * main loop can still dispatch external events, even after bdrv_drained_begin
+ * is called.
+ *
  * This function can be recursive.
  */
 void bdrv_drained_begin(BlockDriverState *bs);