1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/* $OpenBSD: softraid_raid0.c,v 1.53 2020/03/25 21:29:04 tobhe Exp $ */
/*
* Copyright (c) 2008 Marco Peereboom <marco@peereboom.us>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "bio.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/disk.h>
#include <sys/rwlock.h>
#include <sys/queue.h>
#include <sys/fcntl.h>
#include <sys/mount.h>
#include <sys/sensors.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/uio.h>
#include <scsi/scsi_all.h>
#include <scsi/scsiconf.h>
#include <scsi/scsi_disk.h>
#include <dev/softraidvar.h>
/* RAID 0 functions. */
int sr_raid0_create(struct sr_discipline *, struct bioc_createraid *,
int, int64_t);
int sr_raid0_assemble(struct sr_discipline *, struct bioc_createraid *,
int, void *);
int sr_raid0_init(struct sr_discipline *);
int sr_raid0_rw(struct sr_workunit *);
/* Discipline initialisation. */
void
sr_raid0_discipline_init(struct sr_discipline *sd)
{
/* Fill out discipline members. */
sd->sd_type = SR_MD_RAID0;
strlcpy(sd->sd_name, "RAID 0", sizeof(sd->sd_name));
sd->sd_capabilities = SR_CAP_SYSTEM_DISK | SR_CAP_AUTO_ASSEMBLE;
sd->sd_max_wu = SR_RAID0_NOWU;
/* Setup discipline specific function pointers. */
sd->sd_assemble = sr_raid0_assemble;
sd->sd_create = sr_raid0_create;
sd->sd_scsi_rw = sr_raid0_rw;
}
int
sr_raid0_create(struct sr_discipline *sd, struct bioc_createraid *bc,
int no_chunk, int64_t coerced_size)
{
if (no_chunk < 2) {
sr_error(sd->sd_sc, "%s requires two or more chunks",
sd->sd_name);
return EINVAL;
}
/*
* XXX add variable strip size later even though MAXPHYS is really
* the clever value, users like to tinker with that type of stuff.
*/
sd->sd_meta->ssdi.ssd_strip_size = MAXPHYS;
sd->sd_meta->ssdi.ssd_size = (coerced_size &
~(((u_int64_t)sd->sd_meta->ssdi.ssd_strip_size >>
DEV_BSHIFT) - 1)) * no_chunk;
return sr_raid0_init(sd);
}
int
sr_raid0_assemble(struct sr_discipline *sd, struct bioc_createraid *bc,
int no_chunks, void *data)
{
return sr_raid0_init(sd);
}
int
sr_raid0_init(struct sr_discipline *sd)
{
/* Initialise runtime values. */
sd->mds.mdd_raid0.sr0_strip_bits =
sr_validate_stripsize(sd->sd_meta->ssdi.ssd_strip_size);
if (sd->mds.mdd_raid0.sr0_strip_bits == -1) {
sr_error(sd->sd_sc, "%s: invalid strip size", sd->sd_name);
return EINVAL;
}
sd->sd_max_ccb_per_wu =
(MAXPHYS / sd->sd_meta->ssdi.ssd_strip_size + 1) *
SR_RAID0_NOWU * sd->sd_meta->ssdi.ssd_chunk_no;
return 0;
}
int
sr_raid0_rw(struct sr_workunit *wu)
{
struct sr_discipline *sd = wu->swu_dis;
struct scsi_xfer *xs = wu->swu_xs;
struct sr_ccb *ccb;
struct sr_chunk *scp;
daddr_t blkno;
int64_t chunkoffs, lbaoffs, offset, stripoffs;
int64_t strip_bits, strip_no, strip_size;
int64_t chunk, no_chunk;
int64_t length, leftover;
u_int8_t *data;
/* blkno and scsi error will be handled by sr_validate_io */
if (sr_validate_io(wu, &blkno, "sr_raid0_rw"))
goto bad;
strip_size = sd->sd_meta->ssdi.ssd_strip_size;
strip_bits = sd->mds.mdd_raid0.sr0_strip_bits;
no_chunk = sd->sd_meta->ssdi.ssd_chunk_no;
DNPRINTF(SR_D_DIS, "%s: %s: front end io: blkno %lld size %d\n",
DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname,
(long long)blkno, xs->datalen);
/* all offs are in bytes */
lbaoffs = blkno << DEV_BSHIFT;
strip_no = lbaoffs >> strip_bits;
chunk = strip_no % no_chunk;
stripoffs = lbaoffs & (strip_size - 1);
chunkoffs = (strip_no / no_chunk) << strip_bits;
offset = chunkoffs + stripoffs;
length = MIN(xs->datalen, strip_size - stripoffs);
leftover = xs->datalen;
data = xs->data;
for (;;) {
/* make sure chunk is online */
scp = sd->sd_vol.sv_chunks[chunk];
if (scp->src_meta.scm_status != BIOC_SDONLINE)
goto bad;
DNPRINTF(SR_D_DIS, "%s: %s %s io lbaoffs %lld "
"strip_no %lld chunk %lld stripoffs %lld "
"chunkoffs %lld offset %lld length %lld "
"leftover %lld data %p\n",
DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname, sd->sd_name,
lbaoffs, strip_no, chunk, stripoffs, chunkoffs, offset,
length, leftover, data);
blkno = offset >> DEV_BSHIFT;
ccb = sr_ccb_rw(sd, chunk, blkno, length, data, xs->flags, 0);
if (!ccb) {
/* should never happen but handle more gracefully */
printf("%s: %s: too many ccbs queued\n",
DEVNAME(sd->sd_sc),
sd->sd_meta->ssd_devname);
goto bad;
}
sr_wu_enqueue_ccb(wu, ccb);
leftover -= length;
if (leftover == 0)
break;
data += length;
if (++chunk > no_chunk - 1) {
chunk = 0;
offset += length;
} else if (wu->swu_io_count == 1)
offset -= stripoffs;
length = MIN(leftover,strip_size);
}
sr_schedule_wu(wu);
return (0);
bad:
/* wu is unwound by sr_wu_put */
return (1);
}
|
