77 lines
3.1 KiB
Diff
77 lines
3.1 KiB
Diff
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Benjamin Marzinski <bmarzins@redhat.com>
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Date: Wed, 22 Nov 2023 16:41:22 -0500
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Subject: [PATCH] multipathd: Make sure to disable queueing if recovery has
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failed.
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If a multipath device has no_path_retry set to a number and has lost all
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paths, gone into recovery mode, and timed out, it will disable
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queue_if_no_paths. After that, if the device is reloaded by multipath
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outside of multipathd, it will re-enable queuieng on the device. When
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multipathd later calls set_no_path_retry() to update the queueing state,
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it will not disable queue_if_no_paths, since the device is still in the
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recovery state, so it believes no work needs to be done. The device will
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remain in the recovery state, with retry_ticks at 0, and queueing
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enabled, even though there are no usable paths.
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To fix this, in set_no_path_retry(), if no_path_retry is set to a number
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and the device is queueing but it is in recovery mode and out of
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retries with no usable paths, manually disable queue_if_no_path.
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/structs_vec.c | 26 ++++++++++++++++++++++++--
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1 file changed, 24 insertions(+), 2 deletions(-)
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diff --git a/libmultipath/structs_vec.c b/libmultipath/structs_vec.c
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index 4a32b405..86ad89ca 100644
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--- a/libmultipath/structs_vec.c
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+++ b/libmultipath/structs_vec.c
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@@ -614,8 +614,19 @@ void __set_no_path_retry(struct multipath *mpp, bool check_features)
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!mpp->in_recovery)
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dm_queue_if_no_path(mpp->alias, 1);
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leave_recovery_mode(mpp);
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- } else
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- enter_recovery_mode(mpp);
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+ } else {
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+ /*
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+ * If in_recovery is set, enter_recovery_mode does
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+ * nothing. If the device is already in recovery
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+ * mode and has already timed out, manually call
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+ * dm_queue_if_no_path to stop it from queueing.
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+ */
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+ if ((!check_features || is_queueing) &&
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+ mpp->in_recovery && mpp->retry_tick == 0)
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+ dm_queue_if_no_path(mpp->alias, 0);
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+ if (pathcount(mpp, PATH_PENDING) == 0)
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+ enter_recovery_mode(mpp);
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+ }
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break;
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}
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}
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@@ -761,6 +772,11 @@ int verify_paths(struct multipath *mpp)
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* -1 (FAIL) : fail_if_no_path
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* 0 (UNDEF) : nothing
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* >0 : queue_if_no_path enabled, turned off after polling n times
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+ *
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+ * Since this will only be called when fail_path(), update_multipath(), or
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+ * io_err_stat_handle_pathfail() are failing a previously active path, the
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+ * device cannot already be in recovery mode, so there will never be a need
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+ * to disable queueing here.
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*/
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void update_queue_mode_del_path(struct multipath *mpp)
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{
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@@ -774,6 +790,12 @@ void update_queue_mode_del_path(struct multipath *mpp)
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condlog(2, "%s: remaining active paths: %d", mpp->alias, active);
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}
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+/*
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+ * Since this will only be called from check_path() -> reinstate_path() after
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+ * the queueing state has been updated in set_no_path_retry, this does not
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+ * need to worry about modifying the queueing state except when actually
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+ * leaving recovery mode.
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+ */
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void update_queue_mode_add_path(struct multipath *mpp)
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{
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int active = count_active_paths(mpp);
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