geom_disk.c revision 141624
192108Sphk/*- 292108Sphk * Copyright (c) 2002 Poul-Henning Kamp 392108Sphk * Copyright (c) 2002 Networks Associates Technology, Inc. 492108Sphk * All rights reserved. 592108Sphk * 692108Sphk * This software was developed for the FreeBSD Project by Poul-Henning Kamp 792108Sphk * and NAI Labs, the Security Research Division of Network Associates, Inc. 892108Sphk * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 992108Sphk * DARPA CHATS research program. 1092108Sphk * 1192108Sphk * Redistribution and use in source and binary forms, with or without 1292108Sphk * modification, are permitted provided that the following conditions 1392108Sphk * are met: 1492108Sphk * 1. Redistributions of source code must retain the above copyright 1592108Sphk * notice, this list of conditions and the following disclaimer. 1692108Sphk * 2. Redistributions in binary form must reproduce the above copyright 1792108Sphk * notice, this list of conditions and the following disclaimer in the 1892108Sphk * documentation and/or other materials provided with the distribution. 1992108Sphk * 3. The names of the authors may not be used to endorse or promote 2092108Sphk * products derived from this software without specific prior written 2192108Sphk * permission. 2292108Sphk * 2392108Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 2492108Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 2592108Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2692108Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2792108Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2892108Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2992108Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 3092108Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 3192108Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 3292108Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 3392108Sphk * SUCH DAMAGE. 3492108Sphk */ 3592108Sphk 36116196Sobrien#include <sys/cdefs.h> 37116196Sobrien__FBSDID("$FreeBSD: head/sys/geom/geom_disk.c 141624 2005-02-10 12:10:35Z phk $"); 38116196Sobrien 39104519Sphk#include "opt_geom.h" 40104519Sphk 4192108Sphk#include <sys/param.h> 4292108Sphk#include <sys/systm.h> 4392108Sphk#include <sys/kernel.h> 4492108Sphk#include <sys/sysctl.h> 4592108Sphk#include <sys/bio.h> 4692108Sphk#include <sys/conf.h> 47110119Sphk#include <sys/fcntl.h> 4892108Sphk#include <sys/malloc.h> 4992108Sphk#include <sys/sysctl.h> 50111979Sphk#include <sys/devicestat.h> 5192108Sphk#include <machine/md_var.h> 5292108Sphk 5392108Sphk#include <sys/lock.h> 5492108Sphk#include <sys/mutex.h> 5592108Sphk#include <geom/geom.h> 56112952Sphk#include <geom/geom_disk.h> 57112476Sphk#include <geom/geom_int.h> 5892108Sphk 59110720Sphkstatic struct mtx g_disk_done_mtx; 60110720Sphk 6192108Sphkstatic g_access_t g_disk_access; 62115473Sphkstatic g_init_t g_disk_init; 63115473Sphkstatic g_fini_t g_disk_fini; 64133314Sphkstatic g_start_t g_disk_start; 65133314Sphkstatic g_ioctl_t g_disk_ioctl; 66133314Sphkstatic g_dumpconf_t g_disk_dumpconf; 6792108Sphk 68141624Sphkstatic struct g_class g_disk_class = { 69112552Sphk .name = "DISK", 70133318Sphk .version = G_VERSION, 71115473Sphk .init = g_disk_init, 72115473Sphk .fini = g_disk_fini, 73133314Sphk .start = g_disk_start, 74133314Sphk .access = g_disk_access, 75133314Sphk .ioctl = g_disk_ioctl, 76133314Sphk .dumpconf = g_disk_dumpconf, 7792108Sphk}; 7892108Sphk 79110720Sphkstatic void 80115473Sphkg_disk_init(struct g_class *mp __unused) 81110720Sphk{ 82115473Sphk 83123271Struckman mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF); 84110720Sphk} 85104936Sphk 86115473Sphkstatic void 87115473Sphkg_disk_fini(struct g_class *mp __unused) 88115473Sphk{ 89110720Sphk 90115473Sphk mtx_destroy(&g_disk_done_mtx); 91115473Sphk} 92115473Sphk 93115473SphkDECLARE_GEOM_CLASS(g_disk_class, g_disk); 94115473Sphk 95110052Sphkstatic void __inline 96110052Sphkg_disk_lock_giant(struct disk *dp) 97110052Sphk{ 98125975Sphk if (dp->d_flags & DISKFLAG_NEEDSGIANT) 99125975Sphk mtx_lock(&Giant); 100110052Sphk} 101110052Sphk 102110052Sphkstatic void __inline 103110052Sphkg_disk_unlock_giant(struct disk *dp) 104110052Sphk{ 105125975Sphk if (dp->d_flags & DISKFLAG_NEEDSGIANT) 106125975Sphk mtx_unlock(&Giant); 107110052Sphk} 108110052Sphk 10992108Sphkstatic int 11092108Sphkg_disk_access(struct g_provider *pp, int r, int w, int e) 11192108Sphk{ 11292108Sphk struct disk *dp; 11392108Sphk int error; 11492108Sphk 11592108Sphk g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 11692108Sphk pp->name, r, w, e); 11792108Sphk g_topology_assert(); 118125539Spjd dp = pp->geom->softc; 119125975Sphk if (dp == NULL || dp->d_destroyed) { 120125539Spjd /* 121125539Spjd * Allow decreasing access count even if disk is not 122125539Spjd * avaliable anymore. 123125539Spjd */ 124125539Spjd if (r <= 0 && w <= 0 && e <= 0) 125125539Spjd return (0); 126125975Sphk return (ENXIO); 127125539Spjd } 12892108Sphk r += pp->acr; 12992108Sphk w += pp->acw; 13092108Sphk e += pp->ace; 131110119Sphk error = 0; 13292108Sphk if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 133111668Sphk if (dp->d_open != NULL) { 134110119Sphk g_disk_lock_giant(dp); 135111668Sphk error = dp->d_open(dp); 136110119Sphk if (error != 0) 137110119Sphk printf("Opened disk %s -> %d\n", 138110119Sphk pp->name, error); 139110119Sphk g_disk_unlock_giant(dp); 140110119Sphk } 141105551Sphk pp->mediasize = dp->d_mediasize; 142105551Sphk pp->sectorsize = dp->d_sectorsize; 143110119Sphk dp->d_flags |= DISKFLAG_OPEN; 144110727Sphk if (dp->d_maxsize == 0) { 145110727Sphk printf("WARNING: Disk drive %s%d has no d_maxsize\n", 146110727Sphk dp->d_name, dp->d_unit); 147110727Sphk dp->d_maxsize = DFLTPHYS; 148110727Sphk } 14992108Sphk } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 150111668Sphk if (dp->d_close != NULL) { 151110119Sphk g_disk_lock_giant(dp); 152111668Sphk error = dp->d_close(dp); 153110119Sphk if (error != 0) 154110119Sphk printf("Closed disk %s -> %d\n", 155110119Sphk pp->name, error); 156110119Sphk g_disk_unlock_giant(dp); 157110119Sphk } 158110119Sphk dp->d_flags &= ~DISKFLAG_OPEN; 15992108Sphk } 16092108Sphk return (error); 16192108Sphk} 16292108Sphk 16392108Sphkstatic void 16495038Sphkg_disk_kerneldump(struct bio *bp, struct disk *dp) 16595038Sphk{ 16695038Sphk int error; 16795038Sphk struct g_kerneldump *gkd; 16895038Sphk struct dumperinfo di; 169104450Sphk struct g_geom *gp; 17095038Sphk 17195038Sphk gkd = (struct g_kerneldump*)bp->bio_data; 172104450Sphk gp = bp->bio_to->geom; 173104450Sphk g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 174104450Sphk gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 175120572Sphk if (dp->d_dump == NULL) { 176120572Sphk g_io_deliver(bp, ENODEV); 177120572Sphk return; 178120572Sphk } 179110119Sphk di.dumper = dp->d_dump; 180111220Sphk di.priv = dp; 181103714Sphk di.blocksize = dp->d_sectorsize; 18295038Sphk di.mediaoffset = gkd->offset; 183140968Sphk if ((gkd->offset + gkd->length) > dp->d_mediasize) 184140968Sphk gkd->length = dp->d_mediasize - gkd->offset; 18595038Sphk di.mediasize = gkd->length; 18695038Sphk error = set_dumper(&di); 187104195Sphk g_io_deliver(bp, error); 18895038Sphk} 18995038Sphk 19095038Sphkstatic void 19192108Sphkg_disk_done(struct bio *bp) 19292108Sphk{ 193111979Sphk struct bio *bp2; 194111979Sphk struct disk *dp; 19592108Sphk 196110720Sphk /* See "notes" for why we need a mutex here */ 197110720Sphk /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 198110720Sphk mtx_lock(&g_disk_done_mtx); 19992108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 200111979Sphk 201111979Sphk bp2 = bp->bio_parent; 202111979Sphk if (bp2->bio_error == 0) 203111979Sphk bp2->bio_error = bp->bio_error; 204111979Sphk bp2->bio_completed += bp->bio_completed; 205111979Sphk g_destroy_bio(bp); 206111979Sphk bp2->bio_inbed++; 207111979Sphk if (bp2->bio_children == bp2->bio_inbed) { 208112259Sphk bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 209129116Ssos if ((dp = bp2->bio_to->geom->softc)) 210129116Ssos devstat_end_transaction_bio(dp->d_devstat, bp2); 211111979Sphk g_io_deliver(bp2, bp2->bio_error); 212111979Sphk } 213110720Sphk mtx_unlock(&g_disk_done_mtx); 21492108Sphk} 21592108Sphk 216119660Sphkstatic int 217138732Sphkg_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td) 218119660Sphk{ 219119660Sphk struct g_geom *gp; 220119660Sphk struct disk *dp; 221119660Sphk int error; 222119660Sphk 223119660Sphk gp = pp->geom; 224119660Sphk dp = gp->softc; 225119660Sphk 226119660Sphk if (dp->d_ioctl == NULL) 227119660Sphk return (ENOIOCTL); 228119660Sphk g_disk_lock_giant(dp); 229138732Sphk error = dp->d_ioctl(dp, cmd, data, fflag, td); 230119660Sphk g_disk_unlock_giant(dp); 231119660Sphk return(error); 232119660Sphk} 233119660Sphk 23492108Sphkstatic void 23592108Sphkg_disk_start(struct bio *bp) 23692108Sphk{ 237110720Sphk struct bio *bp2, *bp3; 23892108Sphk struct disk *dp; 23992403Sphk int error; 240110720Sphk off_t off; 24192108Sphk 24292108Sphk dp = bp->bio_to->geom->softc; 243125975Sphk if (dp == NULL || dp->d_destroyed) 244115214Sphk g_io_deliver(bp, ENXIO); 245104609Sphk error = EJUSTRETURN; 24692108Sphk switch(bp->bio_cmd) { 247104609Sphk case BIO_DELETE: 248110119Sphk if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 249104609Sphk error = 0; 250104609Sphk break; 251104609Sphk } 252104609Sphk /* fall-through */ 25392108Sphk case BIO_READ: 25492108Sphk case BIO_WRITE: 255110720Sphk off = 0; 256110720Sphk bp3 = NULL; 25792108Sphk bp2 = g_clone_bio(bp); 258110477Sphk if (bp2 == NULL) { 259110477Sphk error = ENOMEM; 260110477Sphk break; 261110477Sphk } 262112259Sphk devstat_start_transaction_bio(dp->d_devstat, bp); 263110720Sphk do { 264110720Sphk bp2->bio_offset += off; 265110720Sphk bp2->bio_length -= off; 266110766Stegge bp2->bio_data += off; 267110720Sphk if (bp2->bio_length > dp->d_maxsize) { 268110720Sphk /* 269110720Sphk * XXX: If we have a stripesize we should really 270110720Sphk * use it here. 271110720Sphk */ 272110720Sphk bp2->bio_length = dp->d_maxsize; 273110720Sphk off += dp->d_maxsize; 274110720Sphk /* 275110720Sphk * To avoid a race, we need to grab the next bio 276110720Sphk * before we schedule this one. See "notes". 277110720Sphk */ 278110720Sphk bp3 = g_clone_bio(bp); 279110720Sphk if (bp3 == NULL) 280110720Sphk bp->bio_error = ENOMEM; 281110720Sphk } 282110720Sphk bp2->bio_done = g_disk_done; 283110720Sphk bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 284110720Sphk bp2->bio_bcount = bp2->bio_length; 285110720Sphk bp2->bio_disk = dp; 286110720Sphk g_disk_lock_giant(dp); 287110720Sphk dp->d_strategy(bp2); 288110720Sphk g_disk_unlock_giant(dp); 289110720Sphk bp2 = bp3; 290110720Sphk bp3 = NULL; 291110720Sphk } while (bp2 != NULL); 29292108Sphk break; 29392108Sphk case BIO_GETATTR: 294105551Sphk if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 29592403Sphk break; 296103714Sphk else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 29792403Sphk break; 29898066Sphk else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 29994287Sphk break; 30095038Sphk else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 30195038Sphk g_disk_kerneldump(bp, dp); 302119660Sphk else 30392403Sphk error = ENOIOCTL; 30492403Sphk break; 30592108Sphk default: 30692403Sphk error = EOPNOTSUPP; 30792403Sphk break; 30892403Sphk } 309104609Sphk if (error != EJUSTRETURN) 310104195Sphk g_io_deliver(bp, error); 31192403Sphk return; 31292108Sphk} 31392108Sphk 314104936Sphkstatic void 315107953Sphkg_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 316105537Sphk{ 317105537Sphk struct disk *dp; 318105537Sphk 319105537Sphk dp = gp->softc; 320120374Sphk if (dp == NULL) 321120374Sphk return; 322106101Sphk if (indent == NULL) { 323106101Sphk sbuf_printf(sb, " hd %u", dp->d_fwheads); 324106101Sphk sbuf_printf(sb, " sc %u", dp->d_fwsectors); 325106101Sphk return; 326106101Sphk } 327105539Sphk if (pp != NULL) { 328105537Sphk sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 329105537Sphk indent, dp->d_fwheads); 330105537Sphk sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 331105537Sphk indent, dp->d_fwsectors); 332105537Sphk } 333105537Sphk} 334105537Sphk 335105537Sphkstatic void 336115309Sphkg_disk_create(void *arg, int flag) 33792108Sphk{ 33892108Sphk struct g_geom *gp; 33992108Sphk struct g_provider *pp; 340110708Sphk struct disk *dp; 34192108Sphk 342115309Sphk if (flag == EV_CANCEL) 343115309Sphk return; 344104936Sphk g_topology_assert(); 345110708Sphk dp = arg; 346110708Sphk gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 347110708Sphk gp->softc = dp; 348104936Sphk pp = g_new_providerf(gp, "%s", gp->name); 349110708Sphk pp->mediasize = dp->d_mediasize; 350110708Sphk pp->sectorsize = dp->d_sectorsize; 351110708Sphk if (dp->d_flags & DISKFLAG_CANDELETE) 352110708Sphk pp->flags |= G_PF_CANDELETE; 353110710Sphk pp->stripeoffset = dp->d_stripeoffset; 354110710Sphk pp->stripesize = dp->d_stripesize; 355105957Sphk if (bootverbose) 356105957Sphk printf("GEOM: new disk %s\n", gp->name); 357112989Sphk dp->d_geom = gp; 358112989Sphk g_error_provider(pp, 0); 359104936Sphk} 360104936Sphk 361119652Sphkstatic void 362119652Sphkg_disk_destroy(void *ptr, int flag) 363119652Sphk{ 364125975Sphk struct disk *dp; 365119652Sphk struct g_geom *gp; 366104936Sphk 367119652Sphk g_topology_assert(); 368125975Sphk dp = ptr; 369125975Sphk gp = dp->d_geom; 370140261Sphk if (gp != NULL) { 371140261Sphk gp->softc = NULL; 372140261Sphk g_wither_geom(gp, ENXIO); 373140261Sphk } 374125975Sphk g_free(dp); 375119652Sphk} 376104936Sphk 377125975Sphkstruct disk * 378125975Sphkdisk_alloc() 379125975Sphk{ 380125975Sphk struct disk *dp; 381125975Sphk 382125975Sphk dp = g_malloc(sizeof *dp, M_WAITOK | M_ZERO); 383125975Sphk return (dp); 384125975Sphk} 385125975Sphk 386111668Sphkvoid 387125975Sphkdisk_create(struct disk *dp, int version) 388104936Sphk{ 389125975Sphk if (version != DISK_VERSION_00) { 390125975Sphk printf("WARNING: Attempt to add disk %s%d %s", 391125975Sphk dp->d_name, dp->d_unit, 392125975Sphk " using incompatible ABI version of disk(9)\n"); 393125975Sphk printf("WARNING: Ignoring disk %s%d\n", 394125975Sphk dp->d_name, dp->d_unit); 395125975Sphk return; 396125975Sphk } 397110119Sphk KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 398110119Sphk KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 399110119Sphk KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 400110317Sphk KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 401120374Sphk if (dp->d_devstat == NULL) 402120374Sphk dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 403120374Sphk dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 404120374Sphk DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 405112989Sphk dp->d_geom = NULL; 406113937Sphk g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 40792108Sphk} 40892108Sphk 40992108Sphkvoid 410111216Sphkdisk_destroy(struct disk *dp) 41192108Sphk{ 41292108Sphk 413112989Sphk g_cancel_event(dp); 414125975Sphk dp->d_destroyed = 1; 415131207Sphk if (dp->d_devstat != NULL) 416131207Sphk devstat_remove_entry(dp->d_devstat); 417131267Sphk g_post_event(g_disk_destroy, dp, M_WAITOK, NULL); 41892108Sphk} 41992108Sphk 420104451Sphkstatic void 421112988Sphkg_kern_disks(void *p, int flag __unused) 422104451Sphk{ 423104451Sphk struct sbuf *sb; 424104451Sphk struct g_geom *gp; 425104451Sphk char *sp; 426104451Sphk 427104451Sphk sb = p; 428104451Sphk sp = ""; 429104451Sphk g_topology_assert(); 430104451Sphk LIST_FOREACH(gp, &g_disk_class.geom, geom) { 431104451Sphk sbuf_printf(sb, "%s%s", sp, gp->name); 432104451Sphk sp = " "; 433104451Sphk } 434104451Sphk sbuf_finish(sb); 435104451Sphk} 436104451Sphk 437104451Sphkstatic int 438104451Sphksysctl_disks(SYSCTL_HANDLER_ARGS) 439104451Sphk{ 440104451Sphk int error; 441104451Sphk struct sbuf *sb; 442104451Sphk 443104451Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 444113940Sphk g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 445113937Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 446104451Sphk sbuf_delete(sb); 447104451Sphk return error; 448104451Sphk} 449104451Sphk 450104451SphkSYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 451104451Sphk sysctl_disks, "A", "names of available disks"); 452104519Sphk 453