108 lines
3.7 KiB
Diff
108 lines
3.7 KiB
Diff
From c7f63e7bbc5119d92775e20d1ebbf8280c78b732 Mon Sep 17 00:00:00 2001
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From: Hanna Reitz <hreitz@redhat.com>
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Date: Fri, 4 Feb 2022 12:10:11 +0100
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Subject: [PATCH 5/6] block/nbd: Move s->ioc on AioContext change
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RH-Author: Hanna Reitz <hreitz@redhat.com>
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RH-MergeRequest: 117: block/nbd: Handle AioContext changes
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RH-Commit: [5/6] 107757b9fbadfb832c75521317108525daa4174e
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RH-Bugzilla: 2035185
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RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
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RH-Acked-by: Eric Blake <eblake@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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s->ioc must always be attached to the NBD node's AioContext. If that
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context changes, s->ioc must be attached to the new context.
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Buglink: https://bugzilla.redhat.com/show_bug.cgi?id=2033626
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Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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Signed-off-by: Hanna Reitz <hreitz@redhat.com>
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Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
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(cherry picked from commit e15f3a66c830e3fce99c9d56c493c2f7078a1225)
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Conflict:
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- block/nbd.c: open_timer was added after the 6.2 release, so we need
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not (and cannot) assert it is NULL here.
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Signed-off-by: Hanna Reitz <hreitz@redhat.com>
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---
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block/nbd.c | 41 +++++++++++++++++++++++++++++++++++++++++
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1 file changed, 41 insertions(+)
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diff --git a/block/nbd.c b/block/nbd.c
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index aab20125d8..a3896c7f5f 100644
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--- a/block/nbd.c
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+++ b/block/nbd.c
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@@ -2003,6 +2003,38 @@ static void nbd_cancel_in_flight(BlockDriverState *bs)
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nbd_co_establish_connection_cancel(s->conn);
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}
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+static void nbd_attach_aio_context(BlockDriverState *bs,
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+ AioContext *new_context)
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+{
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+ BDRVNBDState *s = bs->opaque;
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+
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+ /*
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+ * The reconnect_delay_timer is scheduled in I/O paths when the
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+ * connection is lost, to cancel the reconnection attempt after a
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+ * given time. Once this attempt is done (successfully or not),
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+ * nbd_reconnect_attempt() ensures the timer is deleted before the
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+ * respective I/O request is resumed.
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+ * Since the AioContext can only be changed when a node is drained,
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+ * the reconnect_delay_timer cannot be active here.
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+ */
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+ assert(!s->reconnect_delay_timer);
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+
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+ if (s->ioc) {
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+ qio_channel_attach_aio_context(s->ioc, new_context);
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+ }
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+}
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+
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+static void nbd_detach_aio_context(BlockDriverState *bs)
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+{
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+ BDRVNBDState *s = bs->opaque;
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+
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+ assert(!s->reconnect_delay_timer);
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+
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+ if (s->ioc) {
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+ qio_channel_detach_aio_context(s->ioc);
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+ }
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+}
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+
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static BlockDriver bdrv_nbd = {
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.format_name = "nbd",
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.protocol_name = "nbd",
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@@ -2026,6 +2058,9 @@ static BlockDriver bdrv_nbd = {
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.bdrv_dirname = nbd_dirname,
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.strong_runtime_opts = nbd_strong_runtime_opts,
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.bdrv_cancel_in_flight = nbd_cancel_in_flight,
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+
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+ .bdrv_attach_aio_context = nbd_attach_aio_context,
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+ .bdrv_detach_aio_context = nbd_detach_aio_context,
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};
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static BlockDriver bdrv_nbd_tcp = {
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@@ -2051,6 +2086,9 @@ static BlockDriver bdrv_nbd_tcp = {
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.bdrv_dirname = nbd_dirname,
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.strong_runtime_opts = nbd_strong_runtime_opts,
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.bdrv_cancel_in_flight = nbd_cancel_in_flight,
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+
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+ .bdrv_attach_aio_context = nbd_attach_aio_context,
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+ .bdrv_detach_aio_context = nbd_detach_aio_context,
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};
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static BlockDriver bdrv_nbd_unix = {
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@@ -2076,6 +2114,9 @@ static BlockDriver bdrv_nbd_unix = {
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.bdrv_dirname = nbd_dirname,
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.strong_runtime_opts = nbd_strong_runtime_opts,
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.bdrv_cancel_in_flight = nbd_cancel_in_flight,
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+
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+ .bdrv_attach_aio_context = nbd_attach_aio_context,
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+ .bdrv_detach_aio_context = nbd_detach_aio_context,
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};
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static void bdrv_nbd_init(void)
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--
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2.27.0
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