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Fix overly broad spa config lock

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The spa_txg_history_init_io() and spa_txg_history_fini_io() were
mistakenly taking SCL_ALL when only SCL_CONFIG is required to
access the vdev stats.  This could result in a deadlock which
was observed when running ztest.

Reviewed-by: Olaf Faaland <faaland1@llnl.gov>
Reviewed-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8445
This commit is contained in:
Brian Behlendorf 2019-02-27 10:49:22 -08:00 committed by GitHub
parent c568ab8d99
commit 6af7ba417e
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 4 additions and 5 deletions
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8
module/zfs/spa_stats.c
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@ -414,9 +414,9 @@ spa_txg_history_init_io(spa_t *spa, uint64_t txg, dsl_pool_t *dp)
ts = kmem_alloc(sizeof (txg_stat_t), KM_SLEEP);
spa_config_enter(spa, SCL_ALL, FTAG, RW_READER);
spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
vdev_get_stats(spa->spa_root_vdev, &ts->vs1);
spa_config_exit(spa, SCL_ALL, FTAG);
spa_config_exit(spa, SCL_CONFIG, FTAG);
ts->txg = txg;
ts->ndirty = dp->dp_dirty_pertxg[txg & TXG_MASK];
@ -437,9 +437,9 @@ spa_txg_history_fini_io(spa_t *spa, txg_stat_t *ts)
return;
}
spa_config_enter(spa, SCL_ALL, FTAG, RW_READER);
spa_config_enter(spa, SCL_CONFIG, FTAG, RW_READER);
vdev_get_stats(spa->spa_root_vdev, &ts->vs2);
spa_config_exit(spa, SCL_ALL, FTAG);
spa_config_exit(spa, SCL_CONFIG, FTAG);
spa_txg_history_set(spa, ts->txg, TXG_STATE_SYNCED, gethrtime());
spa_txg_history_set_io(spa, ts->txg,

1
module/zfs/vdev.c
View File

@ -3892,7 +3892,6 @@ vdev_get_stats_ex(vdev_t *vd, vdev_stat_t *vs, vdev_stat_ex_t *vsx)
vs->vs_resilver_deferred = vd->vdev_resilver_deferred;
}
ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_READER) != 0);
vdev_get_stats_ex_impl(vd, vs, vsx);
mutex_exit(&vd->vdev_stat_lock);
}