1/* $OpenBSD: softraid_raid0.c,v 1.53 2020/03/25 21:29:04 tobhe Exp $ */ 2/* 3 * Copyright (c) 2008 Marco Peereboom <marco@peereboom.us> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18#include "bio.h" 19 20#include <sys/param.h> 21#include <sys/systm.h> 22#include <sys/buf.h> 23#include <sys/device.h> 24#include <sys/ioctl.h> 25#include <sys/malloc.h> 26#include <sys/kernel.h> 27#include <sys/disk.h> 28#include <sys/rwlock.h> 29#include <sys/queue.h> 30#include <sys/fcntl.h> 31#include <sys/mount.h> 32#include <sys/sensors.h> 33#include <sys/stat.h> 34#include <sys/conf.h> 35#include <sys/uio.h> 36 37#include <scsi/scsi_all.h> 38#include <scsi/scsiconf.h> 39#include <scsi/scsi_disk.h> 40 41#include <dev/softraidvar.h> 42 43/* RAID 0 functions. */ 44int sr_raid0_create(struct sr_discipline *, struct bioc_createraid *, 45 int, int64_t); 46int sr_raid0_assemble(struct sr_discipline *, struct bioc_createraid *, 47 int, void *); 48int sr_raid0_init(struct sr_discipline *); 49int sr_raid0_rw(struct sr_workunit *); 50 51/* Discipline initialisation. */ 52void 53sr_raid0_discipline_init(struct sr_discipline *sd) 54{ 55 56 /* Fill out discipline members. */ 57 sd->sd_type = SR_MD_RAID0; 58 strlcpy(sd->sd_name, "RAID 0", sizeof(sd->sd_name)); 59 sd->sd_capabilities = SR_CAP_SYSTEM_DISK | SR_CAP_AUTO_ASSEMBLE; 60 sd->sd_max_wu = SR_RAID0_NOWU; 61 62 /* Setup discipline specific function pointers. */ 63 sd->sd_assemble = sr_raid0_assemble; 64 sd->sd_create = sr_raid0_create; 65 sd->sd_scsi_rw = sr_raid0_rw; 66} 67 68int 69sr_raid0_create(struct sr_discipline *sd, struct bioc_createraid *bc, 70 int no_chunk, int64_t coerced_size) 71{ 72 if (no_chunk < 2) { 73 sr_error(sd->sd_sc, "%s requires two or more chunks", 74 sd->sd_name); 75 return EINVAL; 76 } 77 78 /* 79 * XXX add variable strip size later even though MAXPHYS is really 80 * the clever value, users like to tinker with that type of stuff. 81 */ 82 sd->sd_meta->ssdi.ssd_strip_size = MAXPHYS; 83 sd->sd_meta->ssdi.ssd_size = (coerced_size & 84 ~(((u_int64_t)sd->sd_meta->ssdi.ssd_strip_size >> 85 DEV_BSHIFT) - 1)) * no_chunk; 86 87 return sr_raid0_init(sd); 88} 89 90int 91sr_raid0_assemble(struct sr_discipline *sd, struct bioc_createraid *bc, 92 int no_chunks, void *data) 93{ 94 return sr_raid0_init(sd); 95} 96 97int 98sr_raid0_init(struct sr_discipline *sd) 99{ 100 /* Initialise runtime values. */ 101 sd->mds.mdd_raid0.sr0_strip_bits = 102 sr_validate_stripsize(sd->sd_meta->ssdi.ssd_strip_size); 103 if (sd->mds.mdd_raid0.sr0_strip_bits == -1) { 104 sr_error(sd->sd_sc, "%s: invalid strip size", sd->sd_name); 105 return EINVAL; 106 } 107 sd->sd_max_ccb_per_wu = 108 (MAXPHYS / sd->sd_meta->ssdi.ssd_strip_size + 1) * 109 SR_RAID0_NOWU * sd->sd_meta->ssdi.ssd_chunk_no; 110 111 return 0; 112} 113 114int 115sr_raid0_rw(struct sr_workunit *wu) 116{ 117 struct sr_discipline *sd = wu->swu_dis; 118 struct scsi_xfer *xs = wu->swu_xs; 119 struct sr_ccb *ccb; 120 struct sr_chunk *scp; 121 daddr_t blkno; 122 int64_t chunkoffs, lbaoffs, offset, stripoffs; 123 int64_t strip_bits, strip_no, strip_size; 124 int64_t chunk, no_chunk; 125 int64_t length, leftover; 126 u_int8_t *data; 127 128 /* blkno and scsi error will be handled by sr_validate_io */ 129 if (sr_validate_io(wu, &blkno, "sr_raid0_rw")) 130 goto bad; 131 132 strip_size = sd->sd_meta->ssdi.ssd_strip_size; 133 strip_bits = sd->mds.mdd_raid0.sr0_strip_bits; 134 no_chunk = sd->sd_meta->ssdi.ssd_chunk_no; 135 136 DNPRINTF(SR_D_DIS, "%s: %s: front end io: blkno %lld size %d\n", 137 DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname, 138 (long long)blkno, xs->datalen); 139 140 /* all offs are in bytes */ 141 lbaoffs = blkno << DEV_BSHIFT; 142 strip_no = lbaoffs >> strip_bits; 143 chunk = strip_no % no_chunk; 144 stripoffs = lbaoffs & (strip_size - 1); 145 chunkoffs = (strip_no / no_chunk) << strip_bits; 146 offset = chunkoffs + stripoffs; 147 length = MIN(xs->datalen, strip_size - stripoffs); 148 leftover = xs->datalen; 149 data = xs->data; 150 for (;;) { 151 /* make sure chunk is online */ 152 scp = sd->sd_vol.sv_chunks[chunk]; 153 if (scp->src_meta.scm_status != BIOC_SDONLINE) 154 goto bad; 155 156 DNPRINTF(SR_D_DIS, "%s: %s %s io lbaoffs %lld " 157 "strip_no %lld chunk %lld stripoffs %lld " 158 "chunkoffs %lld offset %lld length %lld " 159 "leftover %lld data %p\n", 160 DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname, sd->sd_name, 161 lbaoffs, strip_no, chunk, stripoffs, chunkoffs, offset, 162 length, leftover, data); 163 164 blkno = offset >> DEV_BSHIFT; 165 ccb = sr_ccb_rw(sd, chunk, blkno, length, data, xs->flags, 0); 166 if (!ccb) { 167 /* should never happen but handle more gracefully */ 168 printf("%s: %s: too many ccbs queued\n", 169 DEVNAME(sd->sd_sc), 170 sd->sd_meta->ssd_devname); 171 goto bad; 172 } 173 sr_wu_enqueue_ccb(wu, ccb); 174 175 leftover -= length; 176 if (leftover == 0) 177 break; 178 179 data += length; 180 if (++chunk > no_chunk - 1) { 181 chunk = 0; 182 offset += length; 183 } else if (wu->swu_io_count == 1) 184 offset -= stripoffs; 185 length = MIN(leftover,strip_size); 186 } 187 188 sr_schedule_wu(wu); 189 190 return (0); 191 192bad: 193 /* wu is unwound by sr_wu_put */ 194 return (1); 195} 196