ebd0a23ab5
- kvm-migration-multifd-move-macros-to-multifd-header.patch [RHEL-59697] - kvm-migration-refactor-channel-discovery-mechanism.patch [RHEL-59697] - kvm-migration-Add-save_postcopy_prepare-savevm-handler.patch [RHEL-59697] - kvm-migration-ram-Implement-save_postcopy_prepare.patch [RHEL-59697] - kvm-tests-qtest-migration-consolidate-set-capabilities.patch [RHEL-59697] - kvm-migration-write-zero-pages-when-postcopy-enabled.patch [RHEL-59697] - kvm-migration-enable-multifd-and-postcopy-together.patch [RHEL-59697] - kvm-migration-Add-qtest-for-migration-over-RDMA.patch [RHEL-59697] - kvm-qtest-migration-rdma-Enforce-RLIMIT_MEMLOCK-128MB-re.patch [RHEL-59697] - kvm-qtest-migration-rdma-Add-test-for-rdma-migration-wit.patch [RHEL-59697] - kvm-tests-qtest-migration-add-postcopy-tests-with-multif.patch [RHEL-59697] - kvm-file-posix-Fix-aio-threads-performance-regression-af.patch [RHEL-96854] - kvm-block-remove-outdated-comments-about-AioContext-lock.patch [RHEL-88561] - kvm-block-move-drain-outside-of-read-locked-bdrv_reopen_.patch [RHEL-88561] - kvm-block-snapshot-move-drain-outside-of-read-locked-bdr.patch [RHEL-88561] - kvm-block-move-drain-outside-of-read-locked-bdrv_inactiv.patch [RHEL-88561] - kvm-block-mark-bdrv_parent_change_aio_context-GRAPH_RDLO.patch [RHEL-88561] - kvm-block-mark-change_aio_ctx-callback-and-instances-as-.patch [RHEL-88561] - kvm-block-mark-bdrv_child_change_aio_context-GRAPH_RDLOC.patch [RHEL-88561] - kvm-block-move-drain-outside-of-bdrv_change_aio_context-.patch [RHEL-88561] - kvm-block-move-drain-outside-of-bdrv_try_change_aio_cont.patch [RHEL-88561] - kvm-block-move-drain-outside-of-bdrv_attach_child_common.patch [RHEL-88561] - kvm-block-move-drain-outside-of-bdrv_set_backing_hd_drai.patch [RHEL-88561] - kvm-block-move-drain-outside-of-bdrv_root_attach_child.patch [RHEL-88561] - kvm-block-move-drain-outside-of-bdrv_attach_child.patch [RHEL-88561] - kvm-block-move-drain-outside-of-quorum_add_child.patch [RHEL-88561] - kvm-block-move-drain-outside-of-bdrv_root_unref_child.patch [RHEL-88561] - kvm-block-move-drain-outside-of-quorum_del_child.patch [RHEL-88561] - kvm-blockdev-drain-while-unlocked-in-internal_snapshot_a.patch [RHEL-88561] - kvm-blockdev-drain-while-unlocked-in-external_snapshot_a.patch [RHEL-88561] - kvm-block-mark-bdrv_drained_begin-and-friends-as-GRAPH_U.patch [RHEL-88561] - kvm-iotests-graph-changes-while-io-remove-image-file-aft.patch [RHEL-88561] - kvm-iotests-graph-changes-while-io-add-test-case-with-re.patch [RHEL-88561] - Resolves: RHEL-59697 (Allow multifd+postcopy features being enabled together, but only use multifd during precopy ) - Resolves: RHEL-96854 (Performance Degradation(aio=threads) between Upstream Commit b75c5f9 and 984a32f) - Resolves: RHEL-88561 (qemu graph deadlock during job-dismiss)
71 lines
2.4 KiB
Diff
71 lines
2.4 KiB
Diff
From 96407f6d729312c373e9b2ccbf97918d453c7a52 Mon Sep 17 00:00:00 2001
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From: Fiona Ebner <f.ebner@proxmox.com>
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Date: Fri, 30 May 2025 17:10:55 +0200
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Subject: [PATCH 30/33] blockdev: drain while unlocked in
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external_snapshot_action()
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RH-Author: Kevin Wolf <kwolf@redhat.com>
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RH-MergeRequest: 393: block: do not drain while holding the graph lock
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RH-Jira: RHEL-88561
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Hanna Czenczek <hreitz@redhat.com>
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RH-Commit: [18/21] b651de913db70b4897f0085af696cdaf925f5f81 (kmwolf/centos-qemu-kvm)
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This is in preparation to mark bdrv_drained_begin() as GRAPH_UNLOCKED.
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Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
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Message-ID: <20250530151125.955508-19-f.ebner@proxmox.com>
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Reviewed-by: Kevin Wolf <kwolf@redhat.com>
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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(cherry picked from commit 195a8a946a8681dfe7e8aa8d49db415693db5311)
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Signed-off-by: Kevin Wolf <kwolf@redhat.com>
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---
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blockdev.c | 17 ++++++++++++++++-
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1 file changed, 16 insertions(+), 1 deletion(-)
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diff --git a/blockdev.c b/blockdev.c
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index 2560a11a53..998dbe38a5 100644
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--- a/blockdev.c
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+++ b/blockdev.c
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@@ -1377,9 +1377,10 @@ static void external_snapshot_action(TransactionAction *action,
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const char *new_image_file;
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ExternalSnapshotState *state = g_new0(ExternalSnapshotState, 1);
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uint64_t perm, shared;
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+ BlockDriverState *check_bs;
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/* TODO We'll eventually have to take a writer lock in this function */
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- GRAPH_RDLOCK_GUARD_MAINLOOP();
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+ bdrv_graph_rdlock_main_loop();
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tran_add(tran, &external_snapshot_drv, state);
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@@ -1412,11 +1413,25 @@ static void external_snapshot_action(TransactionAction *action,
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state->old_bs = bdrv_lookup_bs(device, node_name, errp);
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if (!state->old_bs) {
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+ bdrv_graph_rdunlock_main_loop();
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return;
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}
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+ /* Need to drain while unlocked. */
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+ bdrv_graph_rdunlock_main_loop();
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/* Paired with .clean() */
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bdrv_drained_begin(state->old_bs);
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+ GRAPH_RDLOCK_GUARD_MAINLOOP();
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+
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+ /* Make sure the associated bs did not change with the drain. */
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+ check_bs = bdrv_lookup_bs(device, node_name, errp);
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+ if (state->old_bs != check_bs) {
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+ if (check_bs) {
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+ error_setg(errp, "Block node of device '%s' unexpectedly changed",
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+ device);
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+ } /* else errp is already set */
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+ return;
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+ }
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if (!bdrv_is_inserted(state->old_bs)) {
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error_setg(errp, "Device '%s' has no medium",
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--
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2.39.3
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