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From e790b4c20a5124239fe93e91fbc87745e5f2cea6 Mon Sep 17 00:00:00 2001
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From: Kevin Wolf <kwolf@redhat.com>
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Date: Fri, 18 Nov 2022 18:41:01 +0100
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Subject: [PATCH 19/31] block: Fix locking for bdrv_reopen_queue_child()
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RH-Author: Stefano Garzarella <sgarzare@redhat.com>
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RH-MergeRequest: 135: block: Simplify drain to prevent QEMU from crashing during snapshot
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RH-Bugzilla: 2155112
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RH-Acked-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
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RH-Acked-by: Hanna Czenczek <hreitz@redhat.com>
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Commit: [7/16] 46bb54506c4400b9a1bf66b6bd7987ff67260003 (sgarzarella/qemu-kvm-c-9-s)
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Callers don't agree whether bdrv_reopen_queue_child() should be called
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with the AioContext lock held or not. Standardise on holding the lock
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(as done by QMP blockdev-reopen and the replication block driver) and
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fix bdrv_reopen() to do the same.
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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Message-Id: <20221118174110.55183-7-kwolf@redhat.com>
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Reviewed-by: Hanna Reitz <hreitz@redhat.com>
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Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 2e117866d7c96cc17e84cd2946fee1bf3292d814)
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Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
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---
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block.c | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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diff --git a/block.c b/block.c
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index 7999fd08c5..46df410b07 100644
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--- a/block.c
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+++ b/block.c
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@@ -4151,6 +4151,8 @@ static bool bdrv_recurse_has_child(BlockDriverState *bs,
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* bs_queue, or the existing bs_queue being used.
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*
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* bs must be drained between bdrv_reopen_queue() and bdrv_reopen_multiple().
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+ *
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+ * To be called with bs->aio_context locked.
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*/
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static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue,
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BlockDriverState *bs,
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@@ -4309,6 +4311,7 @@ static BlockReopenQueue *bdrv_reopen_queue_child(BlockReopenQueue *bs_queue,
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return bs_queue;
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}
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+/* To be called with bs->aio_context locked */
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BlockReopenQueue *bdrv_reopen_queue(BlockReopenQueue *bs_queue,
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BlockDriverState *bs,
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QDict *options, bool keep_old_opts)
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@@ -4473,11 +4476,11 @@ int bdrv_reopen(BlockDriverState *bs, QDict *opts, bool keep_old_opts,
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GLOBAL_STATE_CODE();
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bdrv_subtree_drained_begin(bs);
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+ queue = bdrv_reopen_queue(NULL, bs, opts, keep_old_opts);
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+
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if (ctx != qemu_get_aio_context()) {
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aio_context_release(ctx);
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}
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-
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- queue = bdrv_reopen_queue(NULL, bs, opts, keep_old_opts);
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ret = bdrv_reopen_multiple(queue, errp);
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if (ctx != qemu_get_aio_context()) {
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--
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2.31.1
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