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4334 Improve ZFS N-way mirror read performance


   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright (c) 2012 by Delphix. All rights reserved.

  25  */
  26 
  27 #ifndef _SYS_VDEV_H
  28 #define _SYS_VDEV_H
  29 
  30 #include <sys/spa.h>
  31 #include <sys/zio.h>
  32 #include <sys/dmu.h>
  33 #include <sys/space_map.h>
  34 #include <sys/fs/zfs.h>
  35 
  36 #ifdef  __cplusplus
  37 extern "C" {
  38 #endif
  39 
  40 typedef enum vdev_dtl_type {
  41         DTL_MISSING,    /* 0% replication: no copies of the data */
  42         DTL_PARTIAL,    /* less than 100% replication: some copies missing */
  43         DTL_SCRUB,      /* unable to fully repair during scrub/resilver */
  44         DTL_OUTAGE,     /* temporarily missing (used to attempt detach) */


 101     vdev_state_t *);
 102 extern int vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags);
 103 extern void vdev_clear(spa_t *spa, vdev_t *vd);
 104 
 105 extern boolean_t vdev_is_dead(vdev_t *vd);
 106 extern boolean_t vdev_readable(vdev_t *vd);
 107 extern boolean_t vdev_writeable(vdev_t *vd);
 108 extern boolean_t vdev_allocatable(vdev_t *vd);
 109 extern boolean_t vdev_accessible(vdev_t *vd, zio_t *zio);
 110 
 111 extern void vdev_cache_init(vdev_t *vd);
 112 extern void vdev_cache_fini(vdev_t *vd);
 113 extern int vdev_cache_read(zio_t *zio);
 114 extern void vdev_cache_write(zio_t *zio);
 115 extern void vdev_cache_purge(vdev_t *vd);
 116 
 117 extern void vdev_queue_init(vdev_t *vd);
 118 extern void vdev_queue_fini(vdev_t *vd);
 119 extern zio_t *vdev_queue_io(zio_t *zio);
 120 extern void vdev_queue_io_done(zio_t *zio);



 121 
 122 extern void vdev_config_dirty(vdev_t *vd);
 123 extern void vdev_config_clean(vdev_t *vd);
 124 extern int vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg,
 125     boolean_t);
 126 
 127 extern void vdev_state_dirty(vdev_t *vd);
 128 extern void vdev_state_clean(vdev_t *vd);
 129 
 130 typedef enum vdev_config_flag {
 131         VDEV_CONFIG_SPARE = 1 << 0,
 132         VDEV_CONFIG_L2CACHE = 1 << 1,
 133         VDEV_CONFIG_REMOVING = 1 << 2
 134 } vdev_config_flag_t;
 135 
 136 extern void vdev_top_config_generate(spa_t *spa, nvlist_t *config);
 137 extern nvlist_t *vdev_config_generate(spa_t *spa, vdev_t *vd,
 138     boolean_t getstats, vdev_config_flag_t flags);
 139 
 140 /*




   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Copyright (c) 2012 by Delphix. All rights reserved.
  25  * Copyright (c) 2013 Steven Hartland. All rights reserved.
  26  */
  27 
  28 #ifndef _SYS_VDEV_H
  29 #define _SYS_VDEV_H
  30 
  31 #include <sys/spa.h>
  32 #include <sys/zio.h>
  33 #include <sys/dmu.h>
  34 #include <sys/space_map.h>
  35 #include <sys/fs/zfs.h>
  36 
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40 
  41 typedef enum vdev_dtl_type {
  42         DTL_MISSING,    /* 0% replication: no copies of the data */
  43         DTL_PARTIAL,    /* less than 100% replication: some copies missing */
  44         DTL_SCRUB,      /* unable to fully repair during scrub/resilver */
  45         DTL_OUTAGE,     /* temporarily missing (used to attempt detach) */


 102     vdev_state_t *);
 103 extern int vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags);
 104 extern void vdev_clear(spa_t *spa, vdev_t *vd);
 105 
 106 extern boolean_t vdev_is_dead(vdev_t *vd);
 107 extern boolean_t vdev_readable(vdev_t *vd);
 108 extern boolean_t vdev_writeable(vdev_t *vd);
 109 extern boolean_t vdev_allocatable(vdev_t *vd);
 110 extern boolean_t vdev_accessible(vdev_t *vd, zio_t *zio);
 111 
 112 extern void vdev_cache_init(vdev_t *vd);
 113 extern void vdev_cache_fini(vdev_t *vd);
 114 extern int vdev_cache_read(zio_t *zio);
 115 extern void vdev_cache_write(zio_t *zio);
 116 extern void vdev_cache_purge(vdev_t *vd);
 117 
 118 extern void vdev_queue_init(vdev_t *vd);
 119 extern void vdev_queue_fini(vdev_t *vd);
 120 extern zio_t *vdev_queue_io(zio_t *zio);
 121 extern void vdev_queue_io_done(zio_t *zio);
 122 extern int vdev_queue_length(vdev_t *vd);
 123 extern uint64_t vdev_queue_last_queued_offset(vdev_t *vd);
 124 extern void vdev_queue_register_last_queued_offset(vdev_t *vd, zio_t *zio);
 125 
 126 extern void vdev_config_dirty(vdev_t *vd);
 127 extern void vdev_config_clean(vdev_t *vd);
 128 extern int vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg,
 129     boolean_t);
 130 
 131 extern void vdev_state_dirty(vdev_t *vd);
 132 extern void vdev_state_clean(vdev_t *vd);
 133 
 134 typedef enum vdev_config_flag {
 135         VDEV_CONFIG_SPARE = 1 << 0,
 136         VDEV_CONFIG_L2CACHE = 1 << 1,
 137         VDEV_CONFIG_REMOVING = 1 << 2
 138 } vdev_config_flag_t;
 139 
 140 extern void vdev_top_config_generate(spa_t *spa, nvlist_t *config);
 141 extern nvlist_t *vdev_config_generate(spa_t *spa, vdev_t *vd,
 142     boolean_t getstats, vdev_config_flag_t flags);
 143 
 144 /*