source: mainline/uspace/srv/bd/hr/var.h@ 9f15da1

Last change on this file since 9f15da1 was 401b9e42, checked in by Miroslav Cimerman <mc@…>, 7 months ago

hr: state_changed and peding_invalidation atomic flags

These flags are used to check whether there was a state
change, or if there is a pending invalidation, so that
we can avoid the slow code paths in a lockless fashion.
  • Property mode set to 100644
File size: 4.7 KB
Line 
1/*
2 * Copyright (c) 2025 Miroslav Cimerman
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29/** @addtogroup hr
30 * @{
31 */
32/**
33 * @file
34 */
35
36#ifndef _HR_VAR_H
37#define _HR_VAR_H
38
39#include <adt/list.h>
40#include <bd_srv.h>
41#include <errno.h>
42#include <fibril_synch.h>
43#include <hr.h>
44
45#include "fge.h"
46
47#define NAME "hr"
48
49#define HR_STRIP_SIZE DATA_XFER_LIMIT
50
51struct hr_volume;
52typedef struct hr_volume hr_volume_t;
53
54typedef struct hr_ops {
55 errno_t (*create)(hr_volume_t *);
56 errno_t (*init)(hr_volume_t *);
57 void (*status_event)(hr_volume_t *);
58 errno_t (*add_hotspare)(hr_volume_t *, service_id_t);
59} hr_ops_t;
60
61typedef struct hr_deferred_invalidation {
62 link_t link;
63 size_t index;
64 service_id_t svc_id;
65} hr_deferred_invalidation_t;
66
67typedef struct hr_volume {
68 hr_ops_t hr_ops;
69 bd_srvs_t hr_bds;
70
71 link_t lvolumes; /* protected by static hr_volumes_lock in hr.c */
72
73 /*
74 * XXX: will be gone after all paralelization, but still used
75 * in yet-unparallelized levels
76 */
77 fibril_mutex_t lock;
78
79 list_t range_lock_list;
80 fibril_mutex_t range_lock_list_lock;
81
82 hr_fpool_t *fge;
83
84 /* after assembly, these are invariant */
85 size_t extent_no;
86 size_t bsize;
87 uint64_t nblocks;
88 uint64_t data_blkno;
89 uint64_t data_offset; /* in blocks */
90 uint32_t strip_size;
91 hr_level_t level;
92 uint8_t layout; /* RAID Level Qualifier */
93 service_id_t svc_id;
94 char devname[HR_DEVNAME_LEN];
95
96 size_t hotspare_no;
97 hr_extent_t hotspares[HR_MAX_HOTSPARES + HR_MAX_EXTENTS];
98
99 /* protects hotspares (hotspares.{svc_id,status}, hotspare_no) */
100 fibril_mutex_t hotspare_lock;
101
102 hr_extent_t extents[HR_MAX_EXTENTS];
103 /* protects extents ordering (extents.svc_id) */
104 fibril_rwlock_t extents_lock;
105 /* protects states (extents.status, hr_volume_t.status) */
106 fibril_rwlock_t states_lock;
107
108 /* for halting IO requests when a REBUILD start waits */
109 bool halt_please;
110 fibril_mutex_t halt_lock;
111
112 /*
113 * For deferring invalidations of extents. Used when
114 * an extent has to be invalidated (got ENOMEM on a WRITE),
115 * but workers - therefore state callbacks cannot lock
116 * extents for writing (they are readers), so invalidations
117 * are harvested later when we are able to.
118 */
119 _Atomic bool pending_invalidation;
120 fibril_mutex_t deferred_list_lock;
121 list_t deferred_invalidations_list;
122 hr_deferred_invalidation_t deferred_inval[HR_MAX_EXTENTS];
123
124 _Atomic bool state_changed;
125 _Atomic uint64_t rebuild_blk;
126 uint64_t counter; /* metadata syncing */
127 hr_vol_status_t status;
128} hr_volume_t;
129
130typedef enum {
131 HR_BD_SYNC,
132 HR_BD_READ,
133 HR_BD_WRITE
134} hr_bd_op_type_t;
135
136typedef struct hr_range_lock {
137 fibril_mutex_t lock;
138 link_t link;
139 hr_volume_t *vol;
140 uint64_t off;
141 uint64_t len;
142 size_t pending; /* protected by vol->range_lock_list_lock */
143 bool ignore; /* protected by vol->range_lock_list_lock */
144} hr_range_lock_t;
145
146extern errno_t hr_init_devs(hr_volume_t *);
147extern void hr_fini_devs(hr_volume_t *);
148
149extern errno_t hr_raid0_create(hr_volume_t *);
150extern errno_t hr_raid1_create(hr_volume_t *);
151extern errno_t hr_raid5_create(hr_volume_t *);
152
153extern errno_t hr_raid0_init(hr_volume_t *);
154extern errno_t hr_raid1_init(hr_volume_t *);
155extern errno_t hr_raid5_init(hr_volume_t *);
156
157extern void hr_raid0_status_event(hr_volume_t *);
158extern void hr_raid1_status_event(hr_volume_t *);
159extern void hr_raid5_status_event(hr_volume_t *);
160
161extern errno_t hr_raid1_add_hotspare(hr_volume_t *, service_id_t);
162extern errno_t hr_raid5_add_hotspare(hr_volume_t *, service_id_t);
163
164#endif
165
166/** @}
167 */
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