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When sequential scrubs were merged, all calls to arc_read() (including prefetch IOs) were given ZIO_PRIORITY_ASYNC_READ. Unfortunately, this behaves badly with an existing issue where prefetch IOs cannot be re-prioritized after the issue. The result is that synchronous reads end up in the same vdev_queue as the scrub IOs and can have (in some workloads) multiple seconds of latency. This patch incorporates 2 changes. The first ensures that all scrub IOs are given ZIO_PRIORITY_SCRUB to allow the vdev_queue code to differentiate between these I/Os and user prefetches. Second, this patch introduces zio_change_priority() to provide the missing capability to upgrade a zio's priority. Reviewed by: George Wilson <george.wilson@delphix.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tom Caputi <tcaputi@datto.com> Closes #6921 Closes #6926
177 lines
6.4 KiB
C
177 lines
6.4 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
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* Copyright (c) 2013 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_VDEV_H
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#define _SYS_VDEV_H
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#include <sys/spa.h>
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#include <sys/zio.h>
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#include <sys/dmu.h>
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#include <sys/space_map.h>
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#include <sys/fs/zfs.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef enum vdev_dtl_type {
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DTL_MISSING, /* 0% replication: no copies of the data */
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DTL_PARTIAL, /* less than 100% replication: some copies missing */
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DTL_SCRUB, /* unable to fully repair during scrub/resilver */
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DTL_OUTAGE, /* temporarily missing (used to attempt detach) */
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DTL_TYPES
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} vdev_dtl_type_t;
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extern int zfs_nocacheflush;
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extern int vdev_open(vdev_t *);
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extern void vdev_open_children(vdev_t *);
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extern int vdev_validate(vdev_t *, boolean_t);
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extern void vdev_close(vdev_t *);
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extern int vdev_create(vdev_t *, uint64_t txg, boolean_t isreplace);
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extern void vdev_reopen(vdev_t *);
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extern int vdev_validate_aux(vdev_t *vd);
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extern zio_t *vdev_probe(vdev_t *vd, zio_t *pio);
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extern boolean_t vdev_is_bootable(vdev_t *vd);
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extern vdev_t *vdev_lookup_top(spa_t *spa, uint64_t vdev);
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extern vdev_t *vdev_lookup_by_guid(vdev_t *vd, uint64_t guid);
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extern int vdev_count_leaves(spa_t *spa);
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extern void vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t d,
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uint64_t txg, uint64_t size);
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extern boolean_t vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t d,
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uint64_t txg, uint64_t size);
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extern boolean_t vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t d);
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extern boolean_t vdev_dtl_need_resilver(vdev_t *vd, uint64_t off, size_t size);
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extern void vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg,
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int scrub_done);
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extern boolean_t vdev_dtl_required(vdev_t *vd);
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extern boolean_t vdev_resilver_needed(vdev_t *vd,
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uint64_t *minp, uint64_t *maxp);
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extern void vdev_destroy_unlink_zap(vdev_t *vd, uint64_t zapobj,
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dmu_tx_t *tx);
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extern uint64_t vdev_create_link_zap(vdev_t *vd, dmu_tx_t *tx);
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extern void vdev_construct_zaps(vdev_t *vd, dmu_tx_t *tx);
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extern void vdev_hold(vdev_t *);
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extern void vdev_rele(vdev_t *);
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extern int vdev_metaslab_init(vdev_t *vd, uint64_t txg);
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extern void vdev_metaslab_fini(vdev_t *vd);
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extern void vdev_metaslab_set_size(vdev_t *);
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extern void vdev_expand(vdev_t *vd, uint64_t txg);
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extern void vdev_split(vdev_t *vd);
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extern void vdev_deadman(vdev_t *vd);
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extern void vdev_get_stats_ex(vdev_t *vd, vdev_stat_t *vs, vdev_stat_ex_t *vsx);
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extern void vdev_get_stats(vdev_t *vd, vdev_stat_t *vs);
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extern void vdev_clear_stats(vdev_t *vd);
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extern void vdev_stat_update(zio_t *zio, uint64_t psize);
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extern void vdev_scan_stat_init(vdev_t *vd);
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extern void vdev_propagate_state(vdev_t *vd);
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extern void vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state,
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vdev_aux_t aux);
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extern void vdev_space_update(vdev_t *vd,
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int64_t alloc_delta, int64_t defer_delta, int64_t space_delta);
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extern uint64_t vdev_psize_to_asize(vdev_t *vd, uint64_t psize);
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extern int vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux);
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extern int vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux);
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extern int vdev_online(spa_t *spa, uint64_t guid, uint64_t flags,
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vdev_state_t *);
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extern int vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags);
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extern void vdev_clear(spa_t *spa, vdev_t *vd);
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extern boolean_t vdev_is_dead(vdev_t *vd);
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extern boolean_t vdev_readable(vdev_t *vd);
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extern boolean_t vdev_writeable(vdev_t *vd);
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extern boolean_t vdev_allocatable(vdev_t *vd);
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extern boolean_t vdev_accessible(vdev_t *vd, zio_t *zio);
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extern void vdev_cache_init(vdev_t *vd);
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extern void vdev_cache_fini(vdev_t *vd);
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extern boolean_t vdev_cache_read(zio_t *zio);
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extern void vdev_cache_write(zio_t *zio);
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extern void vdev_cache_purge(vdev_t *vd);
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extern void vdev_queue_init(vdev_t *vd);
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extern void vdev_queue_fini(vdev_t *vd);
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extern zio_t *vdev_queue_io(zio_t *zio);
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extern void vdev_queue_io_done(zio_t *zio);
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extern void vdev_queue_change_io_priority(zio_t *zio, zio_priority_t priority);
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extern int vdev_queue_length(vdev_t *vd);
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extern uint64_t vdev_queue_last_offset(vdev_t *vd);
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extern void vdev_config_dirty(vdev_t *vd);
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extern void vdev_config_clean(vdev_t *vd);
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extern int vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg);
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extern void vdev_state_dirty(vdev_t *vd);
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extern void vdev_state_clean(vdev_t *vd);
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typedef enum vdev_config_flag {
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VDEV_CONFIG_SPARE = 1 << 0,
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VDEV_CONFIG_L2CACHE = 1 << 1,
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VDEV_CONFIG_REMOVING = 1 << 2,
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VDEV_CONFIG_MOS = 1 << 3
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} vdev_config_flag_t;
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extern void vdev_top_config_generate(spa_t *spa, nvlist_t *config);
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extern nvlist_t *vdev_config_generate(spa_t *spa, vdev_t *vd,
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boolean_t getstats, vdev_config_flag_t flags);
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/*
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* Label routines
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*/
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struct uberblock;
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extern uint64_t vdev_label_offset(uint64_t psize, int l, uint64_t offset);
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extern int vdev_label_number(uint64_t psise, uint64_t offset);
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extern nvlist_t *vdev_label_read_config(vdev_t *vd, uint64_t txg);
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extern void vdev_uberblock_load(vdev_t *, struct uberblock *, nvlist_t **);
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extern void vdev_config_generate_stats(vdev_t *vd, nvlist_t *nv);
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extern void vdev_label_write(zio_t *zio, vdev_t *vd, int l, abd_t *buf, uint64_t
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offset, uint64_t size, zio_done_func_t *done, void *private, int flags);
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typedef enum {
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VDEV_LABEL_CREATE, /* create/add a new device */
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VDEV_LABEL_REPLACE, /* replace an existing device */
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VDEV_LABEL_SPARE, /* add a new hot spare */
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VDEV_LABEL_REMOVE, /* remove an existing device */
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VDEV_LABEL_L2CACHE, /* add an L2ARC cache device */
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VDEV_LABEL_SPLIT /* generating new label for split-off dev */
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} vdev_labeltype_t;
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extern int vdev_label_init(vdev_t *vd, uint64_t txg, vdev_labeltype_t reason);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_VDEV_H */
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