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block: Assert drain_all is only called from main AioContext

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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-12-15 09:33:21 +01:00
parent 8e77e0bceb
commit 9a7e86c804
1 changed files with 6 additions and 0 deletions
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6
block/io.c
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@ -330,6 +330,12 @@ void bdrv_drain_all_begin(void)
BdrvNextIterator it; BdrvNextIterator it;
GSList *aio_ctxs = NULL, *ctx; GSList *aio_ctxs = NULL, *ctx;
/* BDRV_POLL_WHILE() for a node can only be called from its own I/O thread
* or the main loop AioContext. We potentially use BDRV_POLL_WHILE() on
* nodes in several different AioContexts, so make sure we're in the main
* context. */
assert(qemu_get_current_aio_context() == qemu_get_aio_context());
block_job_pause_all(); block_job_pause_all();
for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) { for (bs = bdrv_first(&it); bs; bs = bdrv_next(&it)) {