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From d7a1fda2769ba272d89de6caeab35d52b73a9c3c Mon Sep 17 00:00:00 2001
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From: Mariusz Tkaczyk <mariusz.tkaczyk@intel.com>
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Date: Wed, 17 Oct 2018 12:11:41 +0200
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Subject: [RHEL7.7 PATCH 06/21] imsm: update metadata correctly while raid10
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double degradation
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Mdmon calls end_migration() when map state changes from normal to
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degraded. It is not valid because in raid 10 double degradation case
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mdmon breaks checkpointing but array is still rebuilding.
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In this case mdmon has to mark map as degraded and continues marking
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recovery checkpoint in metadata. Migration can be finished only if newly
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failed device is a rebuilding device.
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Add catching double degraded to degraded transition. Migration is
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finished but map state doesn't change, array is still degraded.
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Update failed_disk_num correctly. If double degradation
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happens rebuild will start on the lowest slot, but this variable points
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to the first failed slot. If second fail happens while rebuild this
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variable shouldn't be updated until rebuild is not finished.
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Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@intel.com>
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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super-intel.c | 25 +++++++++++++++++++------
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1 file changed, 19 insertions(+), 6 deletions(-)
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diff --git a/super-intel.c b/super-intel.c
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index 6438987..d2035cc 100644
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--- a/super-intel.c
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+++ b/super-intel.c
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@@ -8136,7 +8136,8 @@ static int mark_failure(struct intel_super *super,
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set_imsm_ord_tbl_ent(map2, slot2,
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idx | IMSM_ORD_REBUILD);
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}
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- if (map->failed_disk_num == 0xff)
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+ if (map->failed_disk_num == 0xff ||
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+ (!is_rebuilding(dev) && map->failed_disk_num > slot))
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map->failed_disk_num = slot;
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clear_disk_badblocks(super->bbm_log, ord_to_idx(ord));
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@@ -8558,13 +8559,25 @@ static void imsm_set_disk(struct active_array *a, int n, int state)
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break;
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}
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if (is_rebuilding(dev)) {
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- dprintf_cont("while rebuilding.");
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+ dprintf_cont("while rebuilding ");
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if (map->map_state != map_state) {
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- dprintf_cont(" Map state change");
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- end_migration(dev, super, map_state);
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+ dprintf_cont("map state change ");
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+ if (n == map->failed_disk_num) {
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+ dprintf_cont("end migration");
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+ end_migration(dev, super, map_state);
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+ } else {
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+ dprintf_cont("raid10 double degradation, map state change");
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+ map->map_state = map_state;
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+ }
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super->updates_pending++;
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- } else if (!rebuild_done) {
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+ } else if (!rebuild_done)
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break;
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+ else if (n == map->failed_disk_num) {
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+ /* r10 double degraded to degraded transition */
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+ dprintf_cont("raid10 double degradation end migration");
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+ end_migration(dev, super, map_state);
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+ a->last_checkpoint = 0;
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+ super->updates_pending++;
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}
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/* check if recovery is really finished */
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@@ -8575,7 +8588,7 @@ static void imsm_set_disk(struct active_array *a, int n, int state)
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}
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if (recovery_not_finished) {
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dprintf_cont("\n");
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- dprintf("Rebuild has not finished yet, state not changed");
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+ dprintf_cont("Rebuild has not finished yet, map state changes only if raid10 double degradation happens");
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if (a->last_checkpoint < mdi->recovery_start) {
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a->last_checkpoint =
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mdi->recovery_start;
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--
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2.7.5
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