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4045 zfs write throttle & i/o scheduler performance work
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: Christopher Siden <christopher.siden@delphix.com>


 415                          * Not only is it unnecessary, it could
 416                          * actually be harmful: if the system lost
 417                          * power while rewriting the only good copy,
 418                          * there would be no good copies left!
 419                          */
 420                         mc = &mm->mm_child[c];
 421 
 422                         if (mc->mc_error == 0) {
 423                                 if (mc->mc_tried)
 424                                         continue;
 425                                 if (!(zio->io_flags & ZIO_FLAG_SCRUB) &&
 426                                     !vdev_dtl_contains(mc->mc_vd, DTL_PARTIAL,
 427                                     zio->io_txg, 1))
 428                                         continue;
 429                                 mc->mc_error = SET_ERROR(ESTALE);
 430                         }
 431 
 432                         zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
 433                             mc->mc_vd, mc->mc_offset,
 434                             zio->io_data, zio->io_size,
 435                             ZIO_TYPE_WRITE, zio->io_priority,
 436                             ZIO_FLAG_IO_REPAIR | (unexpected_errors ?
 437                             ZIO_FLAG_SELF_HEAL : 0), NULL, NULL));
 438                 }
 439         }
 440 }
 441 
 442 static void
 443 vdev_mirror_state_change(vdev_t *vd, int faulted, int degraded)
 444 {
 445         if (faulted == vd->vdev_children)
 446                 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
 447                     VDEV_AUX_NO_REPLICAS);
 448         else if (degraded + faulted != 0)
 449                 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);
 450         else
 451                 vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE);
 452 }
 453 
 454 vdev_ops_t vdev_mirror_ops = {
 455         vdev_mirror_open,




 415                          * Not only is it unnecessary, it could
 416                          * actually be harmful: if the system lost
 417                          * power while rewriting the only good copy,
 418                          * there would be no good copies left!
 419                          */
 420                         mc = &mm->mm_child[c];
 421 
 422                         if (mc->mc_error == 0) {
 423                                 if (mc->mc_tried)
 424                                         continue;
 425                                 if (!(zio->io_flags & ZIO_FLAG_SCRUB) &&
 426                                     !vdev_dtl_contains(mc->mc_vd, DTL_PARTIAL,
 427                                     zio->io_txg, 1))
 428                                         continue;
 429                                 mc->mc_error = SET_ERROR(ESTALE);
 430                         }
 431 
 432                         zio_nowait(zio_vdev_child_io(zio, zio->io_bp,
 433                             mc->mc_vd, mc->mc_offset,
 434                             zio->io_data, zio->io_size,
 435                             ZIO_TYPE_WRITE, ZIO_PRIORITY_ASYNC_WRITE,
 436                             ZIO_FLAG_IO_REPAIR | (unexpected_errors ?
 437                             ZIO_FLAG_SELF_HEAL : 0), NULL, NULL));
 438                 }
 439         }
 440 }
 441 
 442 static void
 443 vdev_mirror_state_change(vdev_t *vd, int faulted, int degraded)
 444 {
 445         if (faulted == vd->vdev_children)
 446                 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
 447                     VDEV_AUX_NO_REPLICAS);
 448         else if (degraded + faulted != 0)
 449                 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);
 450         else
 451                 vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE);
 452 }
 453 
 454 vdev_ops_t vdev_mirror_ops = {
 455         vdev_mirror_open,