geom_disk.c revision 131207
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 131207 2004-06-27 20:53:20Z 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; 6492108Sphk 6593248Sphkstruct g_class g_disk_class = { 66112552Sphk .name = "DISK", 67115473Sphk .init = g_disk_init, 68115473Sphk .fini = g_disk_fini, 6992108Sphk}; 7092108Sphk 71110720Sphkstatic void 72115473Sphkg_disk_init(struct g_class *mp __unused) 73110720Sphk{ 74115473Sphk 75123271Struckman mtx_init(&g_disk_done_mtx, "g_disk_done", NULL, MTX_DEF); 76110720Sphk} 77104936Sphk 78115473Sphkstatic void 79115473Sphkg_disk_fini(struct g_class *mp __unused) 80115473Sphk{ 81110720Sphk 82115473Sphk mtx_destroy(&g_disk_done_mtx); 83115473Sphk} 84115473Sphk 85115473SphkDECLARE_GEOM_CLASS(g_disk_class, g_disk); 86115473Sphk 87110052Sphkstatic void __inline 88110052Sphkg_disk_lock_giant(struct disk *dp) 89110052Sphk{ 90125975Sphk if (dp->d_flags & DISKFLAG_NEEDSGIANT) 91125975Sphk mtx_lock(&Giant); 92110052Sphk} 93110052Sphk 94110052Sphkstatic void __inline 95110052Sphkg_disk_unlock_giant(struct disk *dp) 96110052Sphk{ 97125975Sphk if (dp->d_flags & DISKFLAG_NEEDSGIANT) 98125975Sphk mtx_unlock(&Giant); 99110052Sphk} 100110052Sphk 10192108Sphkstatic int 10292108Sphkg_disk_access(struct g_provider *pp, int r, int w, int e) 10392108Sphk{ 10492108Sphk struct disk *dp; 10592108Sphk int error; 10692108Sphk 10792108Sphk g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 10892108Sphk pp->name, r, w, e); 10992108Sphk g_topology_assert(); 110125539Spjd dp = pp->geom->softc; 111125975Sphk if (dp == NULL || dp->d_destroyed) { 112125539Spjd /* 113125539Spjd * Allow decreasing access count even if disk is not 114125539Spjd * avaliable anymore. 115125539Spjd */ 116125539Spjd if (r <= 0 && w <= 0 && e <= 0) 117125539Spjd return (0); 118125975Sphk return (ENXIO); 119125539Spjd } 12092108Sphk r += pp->acr; 12192108Sphk w += pp->acw; 12292108Sphk e += pp->ace; 123110119Sphk error = 0; 12492108Sphk if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 125111668Sphk if (dp->d_open != NULL) { 126110119Sphk g_disk_lock_giant(dp); 127111668Sphk error = dp->d_open(dp); 128110119Sphk if (error != 0) 129110119Sphk printf("Opened disk %s -> %d\n", 130110119Sphk pp->name, error); 131110119Sphk g_disk_unlock_giant(dp); 132110119Sphk } 133105551Sphk pp->mediasize = dp->d_mediasize; 134105551Sphk pp->sectorsize = dp->d_sectorsize; 135110119Sphk dp->d_flags |= DISKFLAG_OPEN; 136110727Sphk if (dp->d_maxsize == 0) { 137110727Sphk printf("WARNING: Disk drive %s%d has no d_maxsize\n", 138110727Sphk dp->d_name, dp->d_unit); 139110727Sphk dp->d_maxsize = DFLTPHYS; 140110727Sphk } 14192108Sphk } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 142111668Sphk if (dp->d_close != NULL) { 143110119Sphk g_disk_lock_giant(dp); 144111668Sphk error = dp->d_close(dp); 145110119Sphk if (error != 0) 146110119Sphk printf("Closed disk %s -> %d\n", 147110119Sphk pp->name, error); 148110119Sphk g_disk_unlock_giant(dp); 149110119Sphk } 150110119Sphk dp->d_flags &= ~DISKFLAG_OPEN; 15192108Sphk } 15292108Sphk return (error); 15392108Sphk} 15492108Sphk 15592108Sphkstatic void 15695038Sphkg_disk_kerneldump(struct bio *bp, struct disk *dp) 15795038Sphk{ 15895038Sphk int error; 15995038Sphk struct g_kerneldump *gkd; 16095038Sphk struct dumperinfo di; 161104450Sphk struct g_geom *gp; 16295038Sphk 16395038Sphk gkd = (struct g_kerneldump*)bp->bio_data; 164104450Sphk gp = bp->bio_to->geom; 165104450Sphk g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 166104450Sphk gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 167120572Sphk if (dp->d_dump == NULL) { 168120572Sphk g_io_deliver(bp, ENODEV); 169120572Sphk return; 170120572Sphk } 171110119Sphk di.dumper = dp->d_dump; 172111220Sphk di.priv = dp; 173103714Sphk di.blocksize = dp->d_sectorsize; 17495038Sphk di.mediaoffset = gkd->offset; 17595038Sphk di.mediasize = gkd->length; 17695038Sphk error = set_dumper(&di); 177104195Sphk g_io_deliver(bp, error); 17895038Sphk} 17995038Sphk 18095038Sphkstatic void 18192108Sphkg_disk_done(struct bio *bp) 18292108Sphk{ 183111979Sphk struct bio *bp2; 184111979Sphk struct disk *dp; 18592108Sphk 186110720Sphk /* See "notes" for why we need a mutex here */ 187110720Sphk /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 188110720Sphk mtx_lock(&g_disk_done_mtx); 18992108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 190111979Sphk 191111979Sphk bp2 = bp->bio_parent; 192111979Sphk if (bp2->bio_error == 0) 193111979Sphk bp2->bio_error = bp->bio_error; 194111979Sphk bp2->bio_completed += bp->bio_completed; 195111979Sphk g_destroy_bio(bp); 196111979Sphk bp2->bio_inbed++; 197111979Sphk if (bp2->bio_children == bp2->bio_inbed) { 198112259Sphk bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 199129116Ssos if ((dp = bp2->bio_to->geom->softc)) 200129116Ssos devstat_end_transaction_bio(dp->d_devstat, bp2); 201111979Sphk g_io_deliver(bp2, bp2->bio_error); 202111979Sphk } 203110720Sphk mtx_unlock(&g_disk_done_mtx); 20492108Sphk} 20592108Sphk 206119660Sphkstatic int 207119660Sphkg_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, struct thread *td) 208119660Sphk{ 209119660Sphk struct g_geom *gp; 210119660Sphk struct disk *dp; 211119660Sphk int error; 212119660Sphk 213119660Sphk gp = pp->geom; 214119660Sphk dp = gp->softc; 215119660Sphk 216119660Sphk if (dp->d_ioctl == NULL) 217119660Sphk return (ENOIOCTL); 218119660Sphk g_disk_lock_giant(dp); 219119660Sphk error = dp->d_ioctl(dp, cmd, data, 0, td); 220119660Sphk g_disk_unlock_giant(dp); 221119660Sphk return(error); 222119660Sphk} 223119660Sphk 22492108Sphkstatic void 22592108Sphkg_disk_start(struct bio *bp) 22692108Sphk{ 227110720Sphk struct bio *bp2, *bp3; 22892108Sphk struct disk *dp; 22992403Sphk int error; 230110720Sphk off_t off; 23192108Sphk 23292108Sphk dp = bp->bio_to->geom->softc; 233125975Sphk if (dp == NULL || dp->d_destroyed) 234115214Sphk g_io_deliver(bp, ENXIO); 235104609Sphk error = EJUSTRETURN; 23692108Sphk switch(bp->bio_cmd) { 237104609Sphk case BIO_DELETE: 238110119Sphk if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 239104609Sphk error = 0; 240104609Sphk break; 241104609Sphk } 242104609Sphk /* fall-through */ 24392108Sphk case BIO_READ: 24492108Sphk case BIO_WRITE: 245110720Sphk off = 0; 246110720Sphk bp3 = NULL; 24792108Sphk bp2 = g_clone_bio(bp); 248110477Sphk if (bp2 == NULL) { 249110477Sphk error = ENOMEM; 250110477Sphk break; 251110477Sphk } 252112259Sphk devstat_start_transaction_bio(dp->d_devstat, bp); 253110720Sphk do { 254110720Sphk bp2->bio_offset += off; 255110720Sphk bp2->bio_length -= off; 256110766Stegge bp2->bio_data += off; 257110720Sphk if (bp2->bio_length > dp->d_maxsize) { 258110720Sphk /* 259110720Sphk * XXX: If we have a stripesize we should really 260110720Sphk * use it here. 261110720Sphk */ 262110720Sphk bp2->bio_length = dp->d_maxsize; 263110720Sphk off += dp->d_maxsize; 264110720Sphk /* 265110720Sphk * To avoid a race, we need to grab the next bio 266110720Sphk * before we schedule this one. See "notes". 267110720Sphk */ 268110720Sphk bp3 = g_clone_bio(bp); 269110720Sphk if (bp3 == NULL) 270110720Sphk bp->bio_error = ENOMEM; 271110720Sphk } 272110720Sphk bp2->bio_done = g_disk_done; 273110720Sphk bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 274110720Sphk bp2->bio_bcount = bp2->bio_length; 275110720Sphk bp2->bio_disk = dp; 276110720Sphk g_disk_lock_giant(dp); 277110720Sphk dp->d_strategy(bp2); 278110720Sphk g_disk_unlock_giant(dp); 279110720Sphk bp2 = bp3; 280110720Sphk bp3 = NULL; 281110720Sphk } while (bp2 != NULL); 28292108Sphk break; 28392108Sphk case BIO_GETATTR: 284105551Sphk if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 28592403Sphk break; 286103714Sphk else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 28792403Sphk break; 28898066Sphk else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 28994287Sphk break; 29095038Sphk else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 29195038Sphk g_disk_kerneldump(bp, dp); 292119660Sphk else 29392403Sphk error = ENOIOCTL; 29492403Sphk break; 29592108Sphk default: 29692403Sphk error = EOPNOTSUPP; 29792403Sphk break; 29892403Sphk } 299104609Sphk if (error != EJUSTRETURN) 300104195Sphk g_io_deliver(bp, error); 30192403Sphk return; 30292108Sphk} 30392108Sphk 304104936Sphkstatic void 305107953Sphkg_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 306105537Sphk{ 307105537Sphk struct disk *dp; 308105537Sphk 309105537Sphk dp = gp->softc; 310120374Sphk if (dp == NULL) 311120374Sphk return; 312106101Sphk if (indent == NULL) { 313106101Sphk sbuf_printf(sb, " hd %u", dp->d_fwheads); 314106101Sphk sbuf_printf(sb, " sc %u", dp->d_fwsectors); 315106101Sphk return; 316106101Sphk } 317105539Sphk if (pp != NULL) { 318105537Sphk sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 319105537Sphk indent, dp->d_fwheads); 320105537Sphk sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 321105537Sphk indent, dp->d_fwsectors); 322105537Sphk } 323105537Sphk} 324105537Sphk 325105537Sphkstatic void 326115309Sphkg_disk_create(void *arg, int flag) 32792108Sphk{ 32892108Sphk struct g_geom *gp; 32992108Sphk struct g_provider *pp; 330110708Sphk struct disk *dp; 33192108Sphk 332115309Sphk if (flag == EV_CANCEL) 333115309Sphk return; 334104936Sphk g_topology_assert(); 335110708Sphk dp = arg; 336110708Sphk gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 337104936Sphk gp->start = g_disk_start; 338104936Sphk gp->access = g_disk_access; 339119660Sphk gp->ioctl = g_disk_ioctl; 340110708Sphk gp->softc = dp; 341105537Sphk gp->dumpconf = g_disk_dumpconf; 342104936Sphk pp = g_new_providerf(gp, "%s", gp->name); 343110708Sphk pp->mediasize = dp->d_mediasize; 344110708Sphk pp->sectorsize = dp->d_sectorsize; 345110708Sphk if (dp->d_flags & DISKFLAG_CANDELETE) 346110708Sphk pp->flags |= G_PF_CANDELETE; 347110710Sphk pp->stripeoffset = dp->d_stripeoffset; 348110710Sphk pp->stripesize = dp->d_stripesize; 349105957Sphk if (bootverbose) 350105957Sphk printf("GEOM: new disk %s\n", gp->name); 351112989Sphk dp->d_geom = gp; 352112989Sphk g_error_provider(pp, 0); 353104936Sphk} 354104936Sphk 355119652Sphkstatic void 356119652Sphkg_disk_destroy(void *ptr, int flag) 357119652Sphk{ 358125975Sphk struct disk *dp; 359119652Sphk struct g_geom *gp; 360104936Sphk 361119652Sphk g_topology_assert(); 362125975Sphk dp = ptr; 363125975Sphk gp = dp->d_geom; 364119652Sphk gp->softc = NULL; 365119652Sphk g_wither_geom(gp, ENXIO); 366125975Sphk g_free(dp); 367119652Sphk} 368104936Sphk 369125975Sphkstruct disk * 370125975Sphkdisk_alloc() 371125975Sphk{ 372125975Sphk struct disk *dp; 373125975Sphk 374125975Sphk dp = g_malloc(sizeof *dp, M_WAITOK | M_ZERO); 375125975Sphk return (dp); 376125975Sphk} 377125975Sphk 378111668Sphkvoid 379125975Sphkdisk_create(struct disk *dp, int version) 380104936Sphk{ 381125975Sphk if (version != DISK_VERSION_00) { 382125975Sphk printf("WARNING: Attempt to add disk %s%d %s", 383125975Sphk dp->d_name, dp->d_unit, 384125975Sphk " using incompatible ABI version of disk(9)\n"); 385125975Sphk printf("WARNING: Ignoring disk %s%d\n", 386125975Sphk dp->d_name, dp->d_unit); 387125975Sphk return; 388125975Sphk } 389110119Sphk KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 390110119Sphk KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 391110119Sphk KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 392110317Sphk KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 393120374Sphk if (dp->d_devstat == NULL) 394120374Sphk dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 395120374Sphk dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 396120374Sphk DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 397112989Sphk dp->d_geom = NULL; 398113937Sphk g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 39992108Sphk} 40092108Sphk 40192108Sphkvoid 402111216Sphkdisk_destroy(struct disk *dp) 40392108Sphk{ 40492108Sphk 405112989Sphk g_cancel_event(dp); 406125975Sphk dp->d_destroyed = 1; 407131207Sphk if (dp->d_devstat != NULL) 408131207Sphk devstat_remove_entry(dp->d_devstat); 409131207Sphk g_post_event(g_disk_destroy, dp, M_WAITOK, NULL, NULL); 41092108Sphk} 41192108Sphk 412104451Sphkstatic void 413112988Sphkg_kern_disks(void *p, int flag __unused) 414104451Sphk{ 415104451Sphk struct sbuf *sb; 416104451Sphk struct g_geom *gp; 417104451Sphk char *sp; 418104451Sphk 419104451Sphk sb = p; 420104451Sphk sp = ""; 421104451Sphk g_topology_assert(); 422104451Sphk LIST_FOREACH(gp, &g_disk_class.geom, geom) { 423104451Sphk sbuf_printf(sb, "%s%s", sp, gp->name); 424104451Sphk sp = " "; 425104451Sphk } 426104451Sphk sbuf_finish(sb); 427104451Sphk} 428104451Sphk 429104451Sphkstatic int 430104451Sphksysctl_disks(SYSCTL_HANDLER_ARGS) 431104451Sphk{ 432104451Sphk int error; 433104451Sphk struct sbuf *sb; 434104451Sphk 435104451Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 436113940Sphk g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 437113937Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 438104451Sphk sbuf_delete(sb); 439104451Sphk return error; 440104451Sphk} 441104451Sphk 442104451SphkSYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 443104451Sphk sysctl_disks, "A", "names of available disks"); 444104519Sphk 445