diff options
| author | Kevin Wolf <kwolf@redhat.com> | 2017-12-13 18:14:18 +0100 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2017-12-22 15:05:32 +0100 |
| commit | 0f115168943e5bf2219497abfbf5f7a9c271b9b0 (patch) | |
| tree | 4e732225a93d7e87b6f7c6e8b1669d70d6c1da16 | |
| parent | 8119334918e86f45877cfc139192d54f2449a239 (diff) | |
block: Nested drain_end must still call callbacks
bdrv_do_drained_begin() restricts the call of parent callbacks and
aio_disable_external() to the outermost drain section, but the block
driver callbacks are always called. bdrv_do_drained_end() must match
this behaviour, otherwise nodes stay drained even if begin/end calls
were balanced.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| -rw-r--r-- | block/io.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/block/io.c b/block/io.c index 74d2e5278e..6038a16c58 100644 --- a/block/io.c +++ b/block/io.c @@ -273,19 +273,21 @@ void bdrv_drained_begin(BlockDriverState *bs) void bdrv_drained_end(BlockDriverState *bs) { + int old_quiesce_counter; + if (qemu_in_coroutine()) { bdrv_co_yield_to_drain(bs, false); return; } assert(bs->quiesce_counter > 0); - if (atomic_fetch_dec(&bs->quiesce_counter) > 1) { - return; - } + old_quiesce_counter = atomic_fetch_dec(&bs->quiesce_counter); /* Re-enable things in child-to-parent order */ bdrv_drain_invoke(bs, false, false); - bdrv_parent_drained_end(bs); - aio_enable_external(bdrv_get_aio_context(bs)); + if (old_quiesce_counter == 1) { + bdrv_parent_drained_end(bs); + aio_enable_external(bdrv_get_aio_context(bs)); + } } /* |