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[PULL 17/51] block: Drop out of coroutine in bdrv_do_drained_begin_quies
From: |
Kevin Wolf |
Subject: |
[PULL 17/51] block: Drop out of coroutine in bdrv_do_drained_begin_quiesce() |
Date: |
Wed, 14 Dec 2022 14:44:19 +0100 |
The next patch adds a parent drain to bdrv_attach_child_common(), which
shouldn't be, but is currently called from coroutines in some cases (e.g.
.bdrv_co_create implementations generally open new nodes). Therefore,
the assertion that we're not in a coroutine doesn't hold true any more.
We could just remove the assertion because there is nothing in the
function that should be in conflict with running in a coroutine, but
just to be on the safe side, we can reverse the caller relationship
between bdrv_do_drained_begin() and bdrv_do_drained_begin_quiesce() so
that the latter also just drops out of coroutine context and we can
still be certain in the future that any drain code doesn't run in
coroutines.
As a nice side effect, the structure of bdrv_do_drained_begin() is now
symmetrical with bdrv_do_drained_end().
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20221118174110.55183-14-kwolf@redhat.com>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
block/io.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/block/io.c b/block/io.c
index 2e9503df6a..5e9150d92c 100644
--- a/block/io.c
+++ b/block/io.c
@@ -346,10 +346,15 @@ static void coroutine_fn
bdrv_co_yield_to_drain(BlockDriverState *bs,
}
}
-void bdrv_do_drained_begin_quiesce(BlockDriverState *bs, BdrvChild *parent)
+static void bdrv_do_drained_begin(BlockDriverState *bs, BdrvChild *parent,
+ bool poll)
{
IO_OR_GS_CODE();
- assert(!qemu_in_coroutine());
+
+ if (qemu_in_coroutine()) {
+ bdrv_co_yield_to_drain(bs, true, parent, poll);
+ return;
+ }
/* Stop things in parent-to-child order */
if (qatomic_fetch_inc(&bs->quiesce_counter) == 0) {
@@ -359,17 +364,6 @@ void bdrv_do_drained_begin_quiesce(BlockDriverState *bs,
BdrvChild *parent)
bs->drv->bdrv_drain_begin(bs);
}
}
-}
-
-static void bdrv_do_drained_begin(BlockDriverState *bs, BdrvChild *parent,
- bool poll)
-{
- if (qemu_in_coroutine()) {
- bdrv_co_yield_to_drain(bs, true, parent, poll);
- return;
- }
-
- bdrv_do_drained_begin_quiesce(bs, parent);
/*
* Wait for drained requests to finish.
@@ -385,6 +379,11 @@ static void bdrv_do_drained_begin(BlockDriverState *bs,
BdrvChild *parent,
}
}
+void bdrv_do_drained_begin_quiesce(BlockDriverState *bs, BdrvChild *parent)
+{
+ bdrv_do_drained_begin(bs, parent, false);
+}
+
void bdrv_drained_begin(BlockDriverState *bs)
{
IO_OR_GS_CODE();
--
2.38.1
- [PULL 04/51] block: refactor bdrv_list_refresh_perms to allow any list of nodes, (continued)
- [PULL 04/51] block: refactor bdrv_list_refresh_perms to allow any list of nodes, Kevin Wolf, 2022/12/14
- [PULL 06/51] test-bdrv-drain: Don't yield in .bdrv_co_drained_begin/end(), Kevin Wolf, 2022/12/14
- [PULL 11/51] block: Drain individual nodes during reopen, Kevin Wolf, 2022/12/14
- [PULL 14/51] block: Remove subtree drains, Kevin Wolf, 2022/12/14
- [PULL 26/51] block: distinguish between bdrv_create running in coroutine and not, Kevin Wolf, 2022/12/14
- [PULL 09/51] block: Inline bdrv_drain_invoke(), Kevin Wolf, 2022/12/14
- [PULL 12/51] block: Don't use subtree drains in bdrv_drop_intermediate(), Kevin Wolf, 2022/12/14
- [PULL 23/51] block-backend: replace bdrv_*_above with blk_*_above, Kevin Wolf, 2022/12/14
- [PULL 15/51] block: Call drain callbacks only once, Kevin Wolf, 2022/12/14
- [PULL 19/51] block: Remove poll parameter from bdrv_parent_drained_begin_single(), Kevin Wolf, 2022/12/14
- [PULL 17/51] block: Drop out of coroutine in bdrv_do_drained_begin_quiesce(),
Kevin Wolf <=
- [PULL 13/51] stream: Replace subtree drain with a single node drain, Kevin Wolf, 2022/12/14
- [PULL 18/51] block: Don't poll in bdrv_replace_child_noperm(), Kevin Wolf, 2022/12/14
- [PULL 30/51] block-coroutine-wrapper.py: support functions without bs arg, Kevin Wolf, 2022/12/14
- [PULL 21/51] block-copy: add coroutine_fn annotations, Kevin Wolf, 2022/12/14
- [PULL 20/51] block-io: introduce coroutine_fn duplicates for bdrv_common_block_status_above callers, Kevin Wolf, 2022/12/14
- [PULL 22/51] nbd/server.c: add coroutine_fn annotations, Kevin Wolf, 2022/12/14
- [PULL 31/51] block-coroutine-wrapper.py: support also basic return types, Kevin Wolf, 2022/12/14
- [PULL 36/51] graph-lock: Implement guard macros, Kevin Wolf, 2022/12/14
- [PULL 25/51] block: avoid duplicating filename string in bdrv_create, Kevin Wolf, 2022/12/14
- [PULL 29/51] block-coroutine-wrapper.py: introduce co_wrapper, Kevin Wolf, 2022/12/14