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Fix sequential resilver drive failure race condition 

This patch handles the race condition on simultaneous failure of
2 drives, which misses the vdev_rebuild_reset_wanted signal in
vdev_rebuild_thread. We retry to catch this inside the
vdev_rebuild_complete_sync function.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Dipak Ghosh <dipak.ghosh@hpe.com>
Reviewed-by: Akash B <akash-b@hpe.com>
Signed-off-by: Samuel Wycliffe J <samwyc@hpe.com>
Closes #14041
Closes #14050
This commit is contained in:
samwyc 2022-10-20 04:18:13 +05:30 committed by GitHub
parent 2a068a1394
commit 2be0a124af
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1 changed files with 13 additions and 1 deletions
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14
module/zfs/vdev_rebuild.c
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@ -22,6 +22,7 @@
*
* Copyright (c) 2018, Intel Corporation.
* Copyright (c) 2020 by Lawrence Livermore National Security, LLC.
* Copyright (c) 2022 Hewlett Packard Enterprise Development LP.
*/
#include <sys/vdev_impl.h>
@ -134,6 +135,7 @@ static int zfs_rebuild_scrub_enabled = 1;
* For vdev_rebuild_initiate_sync() and vdev_rebuild_reset_sync().
*/
static __attribute__((noreturn)) void vdev_rebuild_thread(void *arg);
static void vdev_rebuild_reset_sync(void *arg, dmu_tx_t *tx);
/*
* Clear the per-vdev rebuild bytes value for a vdev tree.
@ -307,6 +309,17 @@ vdev_rebuild_complete_sync(void *arg, dmu_tx_t *tx)
vdev_rebuild_phys_t *vrp = &vr->vr_rebuild_phys;
mutex_enter(&vd->vdev_rebuild_lock);
/*
* Handle a second device failure if it occurs after all rebuild I/O
* has completed but before this sync task has been executed.
*/
if (vd->vdev_rebuild_reset_wanted) {
mutex_exit(&vd->vdev_rebuild_lock);
vdev_rebuild_reset_sync(arg, tx);
return;
}
vrp->vrp_rebuild_state = VDEV_REBUILD_COMPLETE;
vrp->vrp_end_time = gethrestime_sec();
@ -760,7 +773,6 @@ vdev_rebuild_thread(void *arg)
ASSERT(vd->vdev_rebuilding);
ASSERT(spa_feature_is_active(spa, SPA_FEATURE_DEVICE_REBUILD));
ASSERT3B(vd->vdev_rebuild_cancel_wanted, ==, B_FALSE);
ASSERT3B(vd->vdev_rebuild_reset_wanted, ==, B_FALSE);
vdev_rebuild_t *vr = &vd->vdev_rebuild_config;
vdev_rebuild_phys_t *vrp = &vr->vr_rebuild_phys;