40 lines
1.7 KiB
Diff
40 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Thu, 7 Dec 2023 11:23:18 -0500
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Subject: [PATCH] multipathd: make flush_map() delete maps like the multipath
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command
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When the multipath command tries to delete a multipath device, it first
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disables queueing and then suspends the device to force the IOs to get
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flushed. Then it attempts to delete the device and any kpartx
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partitions. multipathd, on the other hand, simply tries to delete the
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device and kpartx partitions, without disabling queueing or suspending.
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If there are no paths but there is outstanding IO, multipathd will hang
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trying to delete the last kpartx device. This is because it must be the
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last opener of the multipath device (multipath won't try to delete the
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device if it has any openers besides the kpartx devices) and the kernel
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will not allow the last opener of a block device to close until all the
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outstanding IO is flushed. This hang can be avoided if multipathd calls
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dm_suspend_and_flush_map() like the multipath command does, instead of
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dm_flush_map().
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Reviewed-by: Martin Wilck <mwilck@suse.com>
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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multipathd/main.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/multipathd/main.c b/multipathd/main.c
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index 1b5f82e7..3eeca82f 100644
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--- a/multipathd/main.c
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+++ b/multipathd/main.c
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@@ -695,7 +695,7 @@ sync_maps_state(vector mpvec)
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int
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flush_map(struct multipath * mpp, struct vectors * vecs)
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{
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- int r = dm_flush_map(mpp->alias);
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+ int r = dm_suspend_and_flush_map(mpp->alias, 0);
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if (r) {
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condlog(0, "%s: can't flush", mpp->alias);
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return r;
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