softraid_raid0.c revision 1.44
1/* $OpenBSD: softraid_raid0.c,v 1.44 2013/11/21 16:34:50 krw 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/proc.h> 26#include <sys/malloc.h> 27#include <sys/kernel.h> 28#include <sys/disk.h> 29#include <sys/rwlock.h> 30#include <sys/queue.h> 31#include <sys/fcntl.h> 32#include <sys/disklabel.h> 33#include <sys/mount.h> 34#include <sys/sensors.h> 35#include <sys/stat.h> 36#include <sys/conf.h> 37#include <sys/uio.h> 38 39#include <scsi/scsi_all.h> 40#include <scsi/scsiconf.h> 41#include <scsi/scsi_disk.h> 42 43#include <dev/softraidvar.h> 44#include <dev/rndvar.h> 45 46/* RAID 0 functions. */ 47int sr_raid0_create(struct sr_discipline *, struct bioc_createraid *, 48 int, int64_t); 49int sr_raid0_assemble(struct sr_discipline *, struct bioc_createraid *, 50 int, void *); 51int sr_raid0_init(struct sr_discipline *); 52int sr_raid0_rw(struct sr_workunit *); 53 54/* Discipline initialisation. */ 55void 56sr_raid0_discipline_init(struct sr_discipline *sd) 57{ 58 59 /* Fill out discipline members. */ 60 sd->sd_type = SR_MD_RAID0; 61 strlcpy(sd->sd_name, "RAID 0", sizeof(sd->sd_name)); 62 sd->sd_capabilities = SR_CAP_SYSTEM_DISK | SR_CAP_AUTO_ASSEMBLE; 63 sd->sd_max_wu = SR_RAID0_NOWU; 64 65 /* Setup discipline specific function pointers. */ 66 sd->sd_assemble = sr_raid0_assemble; 67 sd->sd_create = sr_raid0_create; 68 sd->sd_scsi_rw = sr_raid0_rw; 69} 70 71int 72sr_raid0_create(struct sr_discipline *sd, struct bioc_createraid *bc, 73 int no_chunk, int64_t coerced_size) 74{ 75 if (no_chunk < 2) { 76 sr_error(sd->sd_sc, "%s requires two or more chunks", 77 sd->sd_name); 78 return EINVAL; 79 } 80 81 /* 82 * XXX add variable strip size later even though MAXPHYS is really 83 * the clever value, users like to tinker with that type of stuff. 84 */ 85 sd->sd_meta->ssdi.ssd_strip_size = MAXPHYS; 86 sd->sd_meta->ssdi.ssd_size = (coerced_size & 87 ~(((u_int64_t)sd->sd_meta->ssdi.ssd_strip_size >> 88 DEV_BSHIFT) - 1)) * no_chunk; 89 90 return sr_raid0_init(sd); 91} 92 93int 94sr_raid0_assemble(struct sr_discipline *sd, struct bioc_createraid *bc, 95 int no_chunks, void *data) 96{ 97 return sr_raid0_init(sd); 98} 99 100int 101sr_raid0_init(struct sr_discipline *sd) 102{ 103 /* Initialise runtime values. */ 104 sd->mds.mdd_raid0.sr0_strip_bits = 105 sr_validate_stripsize(sd->sd_meta->ssdi.ssd_strip_size); 106 if (sd->mds.mdd_raid0.sr0_strip_bits == -1) { 107 sr_error(sd->sd_sc, "invalid strip size", sd->sd_name); 108 return EINVAL; 109 } 110 sd->sd_max_ccb_per_wu = 111 (MAXPHYS / sd->sd_meta->ssdi.ssd_strip_size + 1) * 112 SR_RAID0_NOWU * sd->sd_meta->ssdi.ssd_chunk_no; 113 114 return 0; 115} 116 117int 118sr_raid0_rw(struct sr_workunit *wu) 119{ 120 struct sr_discipline *sd = wu->swu_dis; 121 struct scsi_xfer *xs = wu->swu_xs; 122 struct sr_ccb *ccb; 123 struct sr_chunk *scp; 124 daddr_t blk; 125 int64_t chunkoffs, lbaoffs, physoffs, stripoffs; 126 int64_t strip_bits, strip_no, strip_size; 127 int64_t chunk, no_chunk; 128 int64_t length, leftover; 129 u_int8_t *data; 130 131 /* blk and scsi error will be handled by sr_validate_io */ 132 if (sr_validate_io(wu, &blk, "sr_raid0_rw")) 133 goto bad; 134 135 strip_size = sd->sd_meta->ssdi.ssd_strip_size; 136 strip_bits = sd->mds.mdd_raid0.sr0_strip_bits; 137 no_chunk = sd->sd_meta->ssdi.ssd_chunk_no; 138 139 DNPRINTF(SR_D_DIS, "%s: %s: front end io: lba %lld size %d\n", 140 DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname, 141 (long long)blk, xs->datalen); 142 143 /* all offs are in bytes */ 144 lbaoffs = blk << DEV_BSHIFT; 145 strip_no = lbaoffs >> strip_bits; 146 chunk = strip_no % no_chunk; 147 stripoffs = lbaoffs & (strip_size - 1); 148 chunkoffs = (strip_no / no_chunk) << strip_bits; 149 physoffs = chunkoffs + stripoffs + 150 (sd->sd_meta->ssd_data_offset << DEV_BSHIFT); 151 length = MIN(xs->datalen, strip_size - stripoffs); 152 leftover = xs->datalen; 153 data = xs->data; 154 for (;;) { 155 /* make sure chunk is online */ 156 scp = sd->sd_vol.sv_chunks[chunk]; 157 if (scp->src_meta.scm_status != BIOC_SDONLINE) 158 goto bad; 159 160 DNPRINTF(SR_D_DIS, "%s: %s %s io lbaoffs %lld " 161 "strip_no %lld chunk %lld stripoffs %lld " 162 "chunkoffs %lld physoffs %lld length %lld " 163 "leftover %lld data %p\n", 164 DEVNAME(sd->sd_sc), sd->sd_meta->ssd_devname, sd->sd_name, 165 (long long)lbaoffs, (long long)strip_no, (long long)chunk, 166 (long long)stripoffs, (long long)chunkoffs, 167 (long long)physoffs, (long long)length, (long long)leftover, 168 data); 169 170 blk = physoffs >> DEV_BSHIFT; 171 ccb = sr_ccb_rw(sd, chunk, blk, length, data, xs->flags, 0); 172 if (!ccb) { 173 /* should never happen but handle more gracefully */ 174 printf("%s: %s: too many ccbs queued\n", 175 DEVNAME(sd->sd_sc), 176 sd->sd_meta->ssd_devname); 177 goto bad; 178 } 179 sr_wu_enqueue_ccb(wu, ccb); 180 181 leftover -= length; 182 if (leftover == 0) 183 break; 184 185 data += length; 186 if (++chunk > no_chunk - 1) { 187 chunk = 0; 188 physoffs += length; 189 } else if (wu->swu_io_count == 1) 190 physoffs -= stripoffs; 191 length = MIN(leftover,strip_size); 192 } 193 194 sr_schedule_wu(wu); 195 196 return (0); 197 198bad: 199 /* wu is unwound by sr_wu_put */ 200 return (1); 201} 202