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4334 Improve ZFS N-way mirror read performance
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--- old/usr/src/uts/common/fs/zfs/sys/vdev.h
+++ new/usr/src/uts/common/fs/zfs/sys/vdev.h
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21
22 22 /*
23 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
24 24 * Copyright (c) 2012 by Delphix. All rights reserved.
25 + * Copyright (c) 2013 Steven Hartland. All rights reserved.
25 26 */
26 27
27 28 #ifndef _SYS_VDEV_H
28 29 #define _SYS_VDEV_H
29 30
30 31 #include <sys/spa.h>
31 32 #include <sys/zio.h>
32 33 #include <sys/dmu.h>
33 34 #include <sys/space_map.h>
34 35 #include <sys/fs/zfs.h>
35 36
36 37 #ifdef __cplusplus
37 38 extern "C" {
38 39 #endif
39 40
40 41 typedef enum vdev_dtl_type {
41 42 DTL_MISSING, /* 0% replication: no copies of the data */
42 43 DTL_PARTIAL, /* less than 100% replication: some copies missing */
43 44 DTL_SCRUB, /* unable to fully repair during scrub/resilver */
44 45 DTL_OUTAGE, /* temporarily missing (used to attempt detach) */
45 46 DTL_TYPES
46 47 } vdev_dtl_type_t;
47 48
48 49 extern boolean_t zfs_nocacheflush;
49 50
50 51 extern int vdev_open(vdev_t *);
51 52 extern void vdev_open_children(vdev_t *);
52 53 extern boolean_t vdev_uses_zvols(vdev_t *);
53 54 extern int vdev_validate(vdev_t *, boolean_t);
54 55 extern void vdev_close(vdev_t *);
55 56 extern int vdev_create(vdev_t *, uint64_t txg, boolean_t isreplace);
56 57 extern void vdev_reopen(vdev_t *);
57 58 extern int vdev_validate_aux(vdev_t *vd);
58 59 extern zio_t *vdev_probe(vdev_t *vd, zio_t *pio);
59 60
60 61 extern boolean_t vdev_is_bootable(vdev_t *vd);
61 62 extern vdev_t *vdev_lookup_top(spa_t *spa, uint64_t vdev);
62 63 extern vdev_t *vdev_lookup_by_guid(vdev_t *vd, uint64_t guid);
63 64 extern void vdev_dtl_dirty(vdev_t *vd, vdev_dtl_type_t d,
64 65 uint64_t txg, uint64_t size);
65 66 extern boolean_t vdev_dtl_contains(vdev_t *vd, vdev_dtl_type_t d,
66 67 uint64_t txg, uint64_t size);
67 68 extern boolean_t vdev_dtl_empty(vdev_t *vd, vdev_dtl_type_t d);
68 69 extern void vdev_dtl_reassess(vdev_t *vd, uint64_t txg, uint64_t scrub_txg,
69 70 int scrub_done);
70 71 extern boolean_t vdev_dtl_required(vdev_t *vd);
71 72 extern boolean_t vdev_resilver_needed(vdev_t *vd,
72 73 uint64_t *minp, uint64_t *maxp);
73 74
74 75 extern void vdev_hold(vdev_t *);
75 76 extern void vdev_rele(vdev_t *);
76 77
77 78 extern int vdev_metaslab_init(vdev_t *vd, uint64_t txg);
78 79 extern void vdev_metaslab_fini(vdev_t *vd);
79 80 extern void vdev_metaslab_set_size(vdev_t *);
80 81 extern void vdev_expand(vdev_t *vd, uint64_t txg);
81 82 extern void vdev_split(vdev_t *vd);
82 83 extern void vdev_deadman(vdev_t *vd);
83 84
84 85
85 86 extern void vdev_get_stats(vdev_t *vd, vdev_stat_t *vs);
86 87 extern void vdev_clear_stats(vdev_t *vd);
87 88 extern void vdev_stat_update(zio_t *zio, uint64_t psize);
88 89 extern void vdev_scan_stat_init(vdev_t *vd);
89 90 extern void vdev_propagate_state(vdev_t *vd);
90 91 extern void vdev_set_state(vdev_t *vd, boolean_t isopen, vdev_state_t state,
91 92 vdev_aux_t aux);
92 93
93 94 extern void vdev_space_update(vdev_t *vd,
94 95 int64_t alloc_delta, int64_t defer_delta, int64_t space_delta);
95 96
96 97 extern uint64_t vdev_psize_to_asize(vdev_t *vd, uint64_t psize);
97 98
98 99 extern int vdev_fault(spa_t *spa, uint64_t guid, vdev_aux_t aux);
99 100 extern int vdev_degrade(spa_t *spa, uint64_t guid, vdev_aux_t aux);
100 101 extern int vdev_online(spa_t *spa, uint64_t guid, uint64_t flags,
101 102 vdev_state_t *);
102 103 extern int vdev_offline(spa_t *spa, uint64_t guid, uint64_t flags);
103 104 extern void vdev_clear(spa_t *spa, vdev_t *vd);
104 105
105 106 extern boolean_t vdev_is_dead(vdev_t *vd);
106 107 extern boolean_t vdev_readable(vdev_t *vd);
107 108 extern boolean_t vdev_writeable(vdev_t *vd);
108 109 extern boolean_t vdev_allocatable(vdev_t *vd);
109 110 extern boolean_t vdev_accessible(vdev_t *vd, zio_t *zio);
110 111
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111 112 extern void vdev_cache_init(vdev_t *vd);
112 113 extern void vdev_cache_fini(vdev_t *vd);
113 114 extern int vdev_cache_read(zio_t *zio);
114 115 extern void vdev_cache_write(zio_t *zio);
115 116 extern void vdev_cache_purge(vdev_t *vd);
116 117
117 118 extern void vdev_queue_init(vdev_t *vd);
118 119 extern void vdev_queue_fini(vdev_t *vd);
119 120 extern zio_t *vdev_queue_io(zio_t *zio);
120 121 extern void vdev_queue_io_done(zio_t *zio);
122 +extern int vdev_queue_length(vdev_t *vd);
123 +extern uint64_t vdev_queue_lastoffset(vdev_t *vd);
124 +extern void vdev_queue_register_lastoffset(vdev_t *vd, zio_t *zio);
121 125
122 126 extern void vdev_config_dirty(vdev_t *vd);
123 127 extern void vdev_config_clean(vdev_t *vd);
124 128 extern int vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg,
125 129 boolean_t);
126 130
127 131 extern void vdev_state_dirty(vdev_t *vd);
128 132 extern void vdev_state_clean(vdev_t *vd);
129 133
130 134 typedef enum vdev_config_flag {
131 135 VDEV_CONFIG_SPARE = 1 << 0,
132 136 VDEV_CONFIG_L2CACHE = 1 << 1,
133 137 VDEV_CONFIG_REMOVING = 1 << 2
134 138 } vdev_config_flag_t;
135 139
136 140 extern void vdev_top_config_generate(spa_t *spa, nvlist_t *config);
137 141 extern nvlist_t *vdev_config_generate(spa_t *spa, vdev_t *vd,
138 142 boolean_t getstats, vdev_config_flag_t flags);
139 143
140 144 /*
141 145 * Label routines
142 146 */
143 147 struct uberblock;
144 148 extern uint64_t vdev_label_offset(uint64_t psize, int l, uint64_t offset);
145 149 extern int vdev_label_number(uint64_t psise, uint64_t offset);
146 150 extern nvlist_t *vdev_label_read_config(vdev_t *vd, uint64_t txg);
147 151 extern void vdev_uberblock_load(vdev_t *, struct uberblock *, nvlist_t **);
148 152
149 153 typedef enum {
150 154 VDEV_LABEL_CREATE, /* create/add a new device */
151 155 VDEV_LABEL_REPLACE, /* replace an existing device */
152 156 VDEV_LABEL_SPARE, /* add a new hot spare */
153 157 VDEV_LABEL_REMOVE, /* remove an existing device */
154 158 VDEV_LABEL_L2CACHE, /* add an L2ARC cache device */
155 159 VDEV_LABEL_SPLIT /* generating new label for split-off dev */
156 160 } vdev_labeltype_t;
157 161
158 162 extern int vdev_label_init(vdev_t *vd, uint64_t txg, vdev_labeltype_t reason);
159 163
160 164 #ifdef __cplusplus
161 165 }
162 166 #endif
163 167
164 168 #endif /* _SYS_VDEV_H */
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