Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/geom/raid/tr_raid0.c
Version:
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2010 Alexander Motin <mav@FreeBSD.org> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/param.h> 33 #include <sys/bio.h> 34 #include <sys/endian.h> 35 #include <sys/kernel.h> 36 #include <sys/kobj.h> 37 #include <sys/lock.h> 38 #include <sys/malloc.h> 39 #include <sys/mutex.h> 40 #include <sys/systm.h> 41 #include <geom/geom.h> 42 #include <geom/geom_dbg.h> 43 #include "geom/raid/g_raid.h" 44 #include "g_raid_tr_if.h" 45 46 static MALLOC_DEFINE(M_TR_RAID0, "tr_raid0_data", "GEOM_RAID RAID0 data"); 47 48 struct g_raid_tr_raid0_object { 49 struct g_raid_tr_object trso_base; 50 int trso_starting; 51 int trso_stopped; 52 }; 53 54 static g_raid_tr_taste_t g_raid_tr_taste_raid0; 55 static g_raid_tr_event_t g_raid_tr_event_raid0; 56 static g_raid_tr_start_t g_raid_tr_start_raid0; 57 static g_raid_tr_stop_t g_raid_tr_stop_raid0; 58 static g_raid_tr_iostart_t g_raid_tr_iostart_raid0; 59 static g_raid_tr_iodone_t g_raid_tr_iodone_raid0; 60 static g_raid_tr_kerneldump_t g_raid_tr_kerneldump_raid0; 61 static g_raid_tr_free_t g_raid_tr_free_raid0; 62 63 static kobj_method_t g_raid_tr_raid0_methods[] = { 64 KOBJMETHOD(g_raid_tr_taste, g_raid_tr_taste_raid0), 65 KOBJMETHOD(g_raid_tr_event, g_raid_tr_event_raid0), 66 KOBJMETHOD(g_raid_tr_start, g_raid_tr_start_raid0), 67 KOBJMETHOD(g_raid_tr_stop, g_raid_tr_stop_raid0), 68 KOBJMETHOD(g_raid_tr_iostart, g_raid_tr_iostart_raid0), 69 KOBJMETHOD(g_raid_tr_iodone, g_raid_tr_iodone_raid0), 70 KOBJMETHOD(g_raid_tr_kerneldump, g_raid_tr_kerneldump_raid0), 71 KOBJMETHOD(g_raid_tr_free, g_raid_tr_free_raid0), 72 { 0, 0 } 73 }; 74 75 static struct g_raid_tr_class g_raid_tr_raid0_class = { 76 "RAID0", 77 g_raid_tr_raid0_methods, 78 sizeof(struct g_raid_tr_raid0_object), 79 .trc_enable = 1, 80 .trc_priority = 100, 81 .trc_accept_unmapped = 1 82 }; 83 84 static int 85 g_raid_tr_taste_raid0(struct g_raid_tr_object *tr, struct g_raid_volume *volume) 86 { 87 struct g_raid_tr_raid0_object *trs; 88 89 trs = (struct g_raid_tr_raid0_object *)tr; 90 if (tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_RAID0 || 91 tr->tro_volume->v_raid_level_qualifier != G_RAID_VOLUME_RLQ_NONE) 92 return (G_RAID_TR_TASTE_FAIL); 93 trs->trso_starting = 1; 94 return (G_RAID_TR_TASTE_SUCCEED); 95 } 96 97 static int 98 g_raid_tr_update_state_raid0(struct g_raid_volume *vol) 99 { 100 struct g_raid_tr_raid0_object *trs; 101 struct g_raid_softc *sc; 102 u_int s; 103 int n, f; 104 105 sc = vol->v_softc; 106 trs = (struct g_raid_tr_raid0_object *)vol->v_tr; 107 if (trs->trso_stopped) 108 s = G_RAID_VOLUME_S_STOPPED; 109 else if (trs->trso_starting) 110 s = G_RAID_VOLUME_S_STARTING; 111 else { 112 n = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_ACTIVE); 113 f = g_raid_nsubdisks(vol, G_RAID_SUBDISK_S_FAILED); 114 if (n + f == vol->v_disks_count) { 115 if (f == 0) 116 s = G_RAID_VOLUME_S_OPTIMAL; 117 else 118 s = G_RAID_VOLUME_S_SUBOPTIMAL; 119 } else 120 s = G_RAID_VOLUME_S_BROKEN; 121 } 122 if (s != vol->v_state) { 123 g_raid_event_send(vol, G_RAID_VOLUME_S_ALIVE(s) ? 124 G_RAID_VOLUME_E_UP : G_RAID_VOLUME_E_DOWN, 125 G_RAID_EVENT_VOLUME); 126 g_raid_change_volume_state(vol, s); 127 if (!trs->trso_starting && !trs->trso_stopped) 128 g_raid_write_metadata(sc, vol, NULL, NULL); 129 } 130 return (0); 131 } 132 133 static int 134 g_raid_tr_event_raid0(struct g_raid_tr_object *tr, 135 struct g_raid_subdisk *sd, u_int event) 136 { 137 struct g_raid_tr_raid0_object *trs; 138 struct g_raid_softc *sc; 139 struct g_raid_volume *vol; 140 int state; 141 142 trs = (struct g_raid_tr_raid0_object *)tr; 143 vol = tr->tro_volume; 144 sc = vol->v_softc; 145 146 state = sd->sd_state; 147 if (state != G_RAID_SUBDISK_S_NONE && 148 state != G_RAID_SUBDISK_S_FAILED && 149 state != G_RAID_SUBDISK_S_ACTIVE) { 150 G_RAID_DEBUG1(1, sc, 151 "Promote subdisk %s:%d from %s to ACTIVE.", 152 vol->v_name, sd->sd_pos, 153 g_raid_subdisk_state2str(sd->sd_state)); 154 g_raid_change_subdisk_state(sd, G_RAID_SUBDISK_S_ACTIVE); 155 } 156 if (state != sd->sd_state && 157 !trs->trso_starting && !trs->trso_stopped) 158 g_raid_write_metadata(sc, vol, sd, NULL); 159 g_raid_tr_update_state_raid0(vol); 160 return (0); 161 } 162 163 static int 164 g_raid_tr_start_raid0(struct g_raid_tr_object *tr) 165 { 166 struct g_raid_tr_raid0_object *trs; 167 struct g_raid_volume *vol; 168 169 trs = (struct g_raid_tr_raid0_object *)tr; 170 vol = tr->tro_volume; 171 trs->trso_starting = 0; 172 g_raid_tr_update_state_raid0(vol); 173 return (0); 174 } 175 176 static int 177 g_raid_tr_stop_raid0(struct g_raid_tr_object *tr) 178 { 179 struct g_raid_tr_raid0_object *trs; 180 struct g_raid_volume *vol; 181 182 trs = (struct g_raid_tr_raid0_object *)tr; 183 vol = tr->tro_volume; 184 trs->trso_starting = 0; 185 trs->trso_stopped = 1; 186 g_raid_tr_update_state_raid0(vol); 187 return (0); 188 } 189 190 static void 191 g_raid_tr_iostart_raid0(struct g_raid_tr_object *tr, struct bio *bp) 192 { 193 struct g_raid_volume *vol; 194 struct g_raid_subdisk *sd; 195 struct bio_queue_head queue; 196 struct bio *cbp; 197 char *addr; 198 off_t offset, start, length, nstripe, remain; 199 u_int no, strip_size; 200 201 vol = tr->tro_volume; 202 if (vol->v_state != G_RAID_VOLUME_S_OPTIMAL && 203 vol->v_state != G_RAID_VOLUME_S_SUBOPTIMAL) { 204 g_raid_iodone(bp, EIO); 205 return; 206 } 207 if (bp->bio_cmd == BIO_FLUSH || bp->bio_cmd == BIO_SPEEDUP) { 208 g_raid_tr_flush_common(tr, bp); 209 return; 210 } 211 if ((bp->bio_flags & BIO_UNMAPPED) != 0) 212 addr = NULL; 213 else 214 addr = bp->bio_data; 215 strip_size = vol->v_strip_size; 216 217 /* Stripe number. */ 218 nstripe = bp->bio_offset / strip_size; 219 /* Start position in stripe. */ 220 start = bp->bio_offset % strip_size; 221 /* Disk number. */ 222 no = nstripe % vol->v_disks_count; 223 /* Stripe start position in disk. */ 224 offset = (nstripe / vol->v_disks_count) * strip_size; 225 /* Length of data to operate. */ 226 remain = bp->bio_length; 227 228 bioq_init(&queue); 229 do { 230 length = MIN(strip_size - start, remain); 231 cbp = g_clone_bio(bp); 232 if (cbp == NULL) 233 goto failure; 234 cbp->bio_offset = offset + start; 235 cbp->bio_length = length; 236 if ((bp->bio_flags & BIO_UNMAPPED) != 0 && 237 bp->bio_cmd != BIO_DELETE) { 238 cbp->bio_ma_offset += (uintptr_t)addr; 239 cbp->bio_ma += cbp->bio_ma_offset / PAGE_SIZE; 240 cbp->bio_ma_offset %= PAGE_SIZE; 241 cbp->bio_ma_n = round_page(cbp->bio_ma_offset + 242 cbp->bio_length) / PAGE_SIZE; 243 } else 244 cbp->bio_data = addr; 245 cbp->bio_caller1 = &vol->v_subdisks[no]; 246 bioq_insert_tail(&queue, cbp); 247 if (++no >= vol->v_disks_count) { 248 no = 0; 249 offset += strip_size; 250 } 251 remain -= length; 252 if (bp->bio_cmd != BIO_DELETE) 253 addr += length; 254 start = 0; 255 } while (remain > 0); 256 while ((cbp = bioq_takefirst(&queue)) != NULL) { 257 sd = cbp->bio_caller1; 258 cbp->bio_caller1 = NULL; 259 g_raid_subdisk_iostart(sd, cbp); 260 } 261 return; 262 failure: 263 while ((cbp = bioq_takefirst(&queue)) != NULL) 264 g_destroy_bio(cbp); 265 if (bp->bio_error == 0) 266 bp->bio_error = ENOMEM; 267 g_raid_iodone(bp, bp->bio_error); 268 } 269 270 static int 271 g_raid_tr_kerneldump_raid0(struct g_raid_tr_object *tr, 272 void *virtual, off_t boffset, size_t blength) 273 { 274 struct g_raid_volume *vol; 275 char *addr; 276 off_t offset, start, length, nstripe, remain; 277 u_int no, strip_size; 278 int error; 279 280 vol = tr->tro_volume; 281 if (vol->v_state != G_RAID_VOLUME_S_OPTIMAL) 282 return (ENXIO); 283 addr = virtual; 284 strip_size = vol->v_strip_size; 285 286 /* Stripe number. */ 287 nstripe = boffset / strip_size; 288 /* Start position in stripe. */ 289 start = boffset % strip_size; 290 /* Disk number. */ 291 no = nstripe % vol->v_disks_count; 292 /* Stripe tart position in disk. */ 293 offset = (nstripe / vol->v_disks_count) * strip_size; 294 /* Length of data to operate. */ 295 remain = blength; 296 297 do { 298 length = MIN(strip_size - start, remain); 299 error = g_raid_subdisk_kerneldump(&vol->v_subdisks[no], addr, 300 offset + start, length); 301 if (error != 0) 302 return (error); 303 if (++no >= vol->v_disks_count) { 304 no = 0; 305 offset += strip_size; 306 } 307 remain -= length; 308 addr += length; 309 start = 0; 310 } while (remain > 0); 311 return (0); 312 } 313 314 static void 315 g_raid_tr_iodone_raid0(struct g_raid_tr_object *tr, 316 struct g_raid_subdisk *sd,struct bio *bp) 317 { 318 struct bio *pbp; 319 320 pbp = bp->bio_parent; 321 if (pbp->bio_error == 0) 322 pbp->bio_error = bp->bio_error; 323 g_destroy_bio(bp); 324 pbp->bio_inbed++; 325 if (pbp->bio_children == pbp->bio_inbed) { 326 pbp->bio_completed = pbp->bio_length; 327 g_raid_iodone(pbp, pbp->bio_error); 328 } 329 } 330 331 static int 332 g_raid_tr_free_raid0(struct g_raid_tr_object *tr) 333 { 334 335 return (0); 336 } 337 338 G_RAID_TR_DECLARE(raid0, "RAID0");
Cache object: b36ea74a767dc543a87dfb00920d8361
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