From: Kevin Wolf <kwolf@redhat.com>
To: qemu-block@nongnu.org
Cc: kwolf@redhat.com, stefanha@redhat.com, eblake@redhat.com,
eesposit@redhat.com, pbonzini@redhat.com,
vsementsov@yandex-team.ru, qemu-devel@nongnu.org
Subject: [PATCH v2 18/21] block: Take graph rdlock in bdrv_change_aio_context()
Date: Mon, 11 Sep 2023 11:46:17 +0200 [thread overview]
Message-ID: <20230911094620.45040-19-kwolf@redhat.com> (raw)
In-Reply-To: <20230911094620.45040-1-kwolf@redhat.com>
The function reads the parents list, so it needs to hold the graph lock.
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
---
block.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/block.c b/block.c
index e024a6ccec..8e589bb2e4 100644
--- a/block.c
+++ b/block.c
@@ -7688,17 +7688,21 @@ static bool bdrv_change_aio_context(BlockDriverState *bs, AioContext *ctx,
return true;
}
+ bdrv_graph_rdlock_main_loop();
QLIST_FOREACH(c, &bs->parents, next_parent) {
if (!bdrv_parent_change_aio_context(c, ctx, visited, tran, errp)) {
+ bdrv_graph_rdunlock_main_loop();
return false;
}
}
QLIST_FOREACH(c, &bs->children, next) {
if (!bdrv_child_change_aio_context(c, ctx, visited, tran, errp)) {
+ bdrv_graph_rdunlock_main_loop();
return false;
}
}
+ bdrv_graph_rdunlock_main_loop();
state = g_new(BdrvStateSetAioContext, 1);
*state = (BdrvStateSetAioContext) {
--
2.41.0
next prev parent reply other threads:[~2023-09-11 9:48 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-11 9:45 [PATCH v2 00/21] Graph locking part 4 (node management) Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 01/21] block: Remove unused BlockReopenQueueEntry.perms_checked Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 02/21] preallocate: Factor out preallocate_truncate_to_real_size() Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 03/21] preallocate: Don't poll during permission updates Kevin Wolf
2023-10-05 19:55 ` Vladimir Sementsov-Ogievskiy
2023-10-06 8:56 ` Kevin Wolf
2023-10-06 18:10 ` Vladimir Sementsov-Ogievskiy
2023-10-09 9:28 ` Denis V. Lunev
2023-09-11 9:46 ` [PATCH v2 04/21] block: Take AioContext lock for bdrv_append() more consistently Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 05/21] block: Introduce bdrv_schedule_unref() Kevin Wolf
2023-09-12 16:49 ` Stefan Hajnoczi
2023-09-11 9:46 ` [PATCH v2 06/21] block-coroutine-wrapper: Add no_co_wrapper_bdrv_wrlock functions Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 07/21] block-coroutine-wrapper: Allow arbitrary parameter names Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 08/21] block: Mark bdrv_replace_child_noperm() GRAPH_WRLOCK Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 09/21] block: Mark bdrv_replace_child_tran() GRAPH_WRLOCK Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 10/21] block: Mark bdrv_attach_child_common() GRAPH_WRLOCK Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 11/21] block: Call transaction callbacks with lock held Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 12/21] block: Mark bdrv_attach_child() GRAPH_WRLOCK Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 13/21] block: Mark bdrv_parent_perms_conflict() and callers GRAPH_RDLOCK Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 14/21] block: Mark bdrv_get_cumulative_perm() " Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 15/21] block: Mark bdrv_child_perm() GRAPH_RDLOCK Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 16/21] block: Mark bdrv_parent_cb_change_media() GRAPH_RDLOCK Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 17/21] block: Take graph rdlock in bdrv_drop_intermediate() Kevin Wolf
2023-09-12 16:49 ` Stefan Hajnoczi
2023-09-11 9:46 ` Kevin Wolf [this message]
2023-09-12 16:49 ` [PATCH v2 18/21] block: Take graph rdlock in bdrv_change_aio_context() Stefan Hajnoczi
2023-09-11 9:46 ` [PATCH v2 19/21] block: Mark bdrv_root_unref_child() GRAPH_WRLOCK Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 20/21] block: Mark bdrv_unref_child() GRAPH_WRLOCK Kevin Wolf
2023-09-11 9:46 ` [PATCH v2 21/21] block: Mark bdrv_add/del_child() and caller GRAPH_WRLOCK Kevin Wolf
2023-09-12 16:49 ` [PATCH v2 00/21] Graph locking part 4 (node management) Stefan Hajnoczi
2023-09-14 13:12 ` Kevin Wolf
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