zfs_scrub_limit tunable is not used anywhere

[zfs.git] / module / zfs / vdev.c

diff --git a/module/zfs/vdev.c b/module/zfs/vdev.c
index b969751..c44e4f6 100644 (file)
--- a/module/zfs/vdev.c
+++ b/module/zfs/vdev.c
@@ -61,9 +61,6 @@ static vdev_ops_t *vdev_ops_table[] = {
        NULL
 };
 
-/* maximum scrub/resilver I/O queue per leaf vdev */
-int zfs_scrub_limit = 10;
-
 /*
  * Given a vdev type, return the appropriate ops vector.
  */
@@ -1258,11 +1255,12 @@ vdev_open(vdev_t *vd)
        if (vd->vdev_asize == 0) {
                /*
                 * This is the first-ever open, so use the computed values.
-                * For testing purposes, a higher ashift can be requested.
+                * For compatibility, a different ashift can be requested.
                 */
                vd->vdev_asize = asize;
                vd->vdev_max_asize = max_asize;
-               vd->vdev_ashift = MAX(ashift, vd->vdev_ashift);
+               if (vd->vdev_ashift == 0)
+                       vd->vdev_ashift = ashift;
        } else {
                /*
                 * Detect if the alignment requirement has increased.
@@ -1348,7 +1346,8 @@ vdev_validate(vdev_t *vd, boolean_t strict)
        if (vd->vdev_ops->vdev_op_leaf && vdev_readable(vd)) {
                uint64_t aux_guid = 0;
                nvlist_t *nvl;
-               uint64_t txg = strict ? spa->spa_config_txg : -1ULL;
+               uint64_t txg = spa_last_synced_txg(spa) != 0 ?
+                   spa_last_synced_txg(spa) : -1ULL;
 
                if ((label = vdev_label_read_config(vd, txg)) == NULL) {
                        vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
@@ -1533,7 +1532,7 @@ vdev_reopen(vdev_t *vd)
                    !l2arc_vdev_present(vd))
                        l2arc_add_vdev(spa, vd);
        } else {
-               (void) vdev_validate(vd, spa_last_synced_txg(spa));
+               (void) vdev_validate(vd, B_TRUE);
        }
 
        /*
@@ -3193,13 +3192,50 @@ vdev_split(vdev_t *vd)
        vdev_propagate_state(cvd);
 }
 
+void
+vdev_deadman(vdev_t *vd)
+{
+       int c;
+
+       for (c = 0; c < vd->vdev_children; c++) {
+               vdev_t *cvd = vd->vdev_child[c];
+
+               vdev_deadman(cvd);
+       }
+
+       if (vd->vdev_ops->vdev_op_leaf) {
+               vdev_queue_t *vq = &vd->vdev_queue;
+
+               mutex_enter(&vq->vq_lock);
+               if (avl_numnodes(&vq->vq_pending_tree) > 0) {
+                       spa_t *spa = vd->vdev_spa;
+                       zio_t *fio;
+                       uint64_t delta;
+
+                       /*
+                        * Look at the head of all the pending queues,
+                        * if any I/O has been outstanding for longer than
+                        * the spa_deadman_synctime we log a zevent.
+                        */
+                       fio = avl_first(&vq->vq_pending_tree);
+                       delta = ddi_get_lbolt64() - fio->io_timestamp;
+                       if (delta > NSEC_TO_TICK(spa_deadman_synctime(spa))) {
+                               zfs_dbgmsg("SLOW IO: zio timestamp %llu, "
+                                   "delta %llu, last io %llu",
+                                   fio->io_timestamp, delta,
+                                   vq->vq_io_complete_ts);
+                               zfs_ereport_post(FM_EREPORT_ZFS_DELAY,
+                                   spa, vd, fio, 0, 0);
+                       }
+               }
+               mutex_exit(&vq->vq_lock);
+       }
+}
+
 #if defined(_KERNEL) && defined(HAVE_SPL)
 EXPORT_SYMBOL(vdev_fault);
 EXPORT_SYMBOL(vdev_degrade);
 EXPORT_SYMBOL(vdev_online);
 EXPORT_SYMBOL(vdev_offline);
 EXPORT_SYMBOL(vdev_clear);
-
-module_param(zfs_scrub_limit, int, 0644);
-MODULE_PARM_DESC(zfs_scrub_limit, "Max scrub/resilver I/O per leaf vdev");
 #endif