geom_disk.c revision 120374
1193323Sed/*- 2193323Sed * Copyright (c) 2002 Poul-Henning Kamp 3193323Sed * Copyright (c) 2002 Networks Associates Technology, Inc. 4193323Sed * All rights reserved. 5193323Sed * 6193323Sed * This software was developed for the FreeBSD Project by Poul-Henning Kamp 7193323Sed * and NAI Labs, the Security Research Division of Network Associates, Inc. 8193323Sed * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the 9193323Sed * DARPA CHATS research program. 10193323Sed * 11249423Sdim * Redistribution and use in source and binary forms, with or without 12193323Sed * modification, are permitted provided that the following conditions 13193323Sed * are met: 14280031Sdim * 1. Redistributions of source code must retain the above copyright 15280031Sdim * notice, this list of conditions and the following disclaimer. 16261991Sdim * 2. Redistributions in binary form must reproduce the above copyright 17276479Sdim * notice, this list of conditions and the following disclaimer in the 18202878Srdivacky * documentation and/or other materials provided with the distribution. 19193323Sed * 3. The names of the authors may not be used to endorse or promote 20249423Sdim * products derived from this software without specific prior written 21198090Srdivacky * permission. 22280031Sdim * 23202878Srdivacky * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 24202878Srdivacky * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25201360Srdivacky * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26198090Srdivacky * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 27198090Srdivacky * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28202878Srdivacky * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29276479Sdim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30261991Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31288943Sdim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32193323Sed * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33193323Sed * SUCH DAMAGE. 34193323Sed */ 35296417Sdim 36296417Sdim#include <sys/cdefs.h> 37296417Sdim__FBSDID("$FreeBSD: head/sys/geom/geom_disk.c 120374 2003-09-23 07:53:59Z phk $"); 38296417Sdim 39296417Sdim#include "opt_geom.h" 40296417Sdim 41296417Sdim#include <sys/param.h> 42296417Sdim#include <sys/systm.h> 43296417Sdim#include <sys/kernel.h> 44296417Sdim#include <sys/sysctl.h> 45296417Sdim#include <sys/bio.h> 46296417Sdim#include <sys/conf.h> 47296417Sdim#include <sys/fcntl.h> 48296417Sdim#include <sys/malloc.h> 49296417Sdim#include <sys/sysctl.h> 50296417Sdim#include <sys/devicestat.h> 51296417Sdim#include <machine/md_var.h> 52296417Sdim 53296417Sdim#include <sys/lock.h> 54296417Sdim#include <sys/mutex.h> 55296417Sdim#include <geom/geom.h> 56296417Sdim#include <geom/geom_disk.h> 57296417Sdim#include <geom/geom_int.h> 58296417Sdim 59296417Sdimstatic struct mtx g_disk_done_mtx; 60296417Sdim 61296417Sdimstatic g_access_t g_disk_access; 62296417Sdimstatic g_init_t g_disk_init; 63296417Sdimstatic g_fini_t g_disk_fini; 64296417Sdim 65296417Sdimstruct g_class g_disk_class = { 66296417Sdim .name = "DISK", 67296417Sdim .init = g_disk_init, 68193323Sed .fini = g_disk_fini, 69193323Sed}; 70193323Sed 71193323Sedstatic void 72193323Sedg_disk_init(struct g_class *mp __unused) 73193323Sed{ 74261991Sdim 75261991Sdim mtx_init(&g_disk_done_mtx, "g_disk_done", MTX_DEF, 0); 76261991Sdim} 77261991Sdim 78193323Sedstatic void 79193323Sedg_disk_fini(struct g_class *mp __unused) 80193323Sed{ 81193323Sed 82193323Sed mtx_destroy(&g_disk_done_mtx); 83193323Sed} 84193323Sed 85193323SedDECLARE_GEOM_CLASS(g_disk_class, g_disk); 86193323Sed 87261991Sdimstatic void __inline 88276479Sdimg_disk_lock_giant(struct disk *dp) 89193323Sed{ 90193323Sed if (dp->d_flags & DISKFLAG_NOGIANT) 91193323Sed return; 92193323Sed mtx_lock(&Giant); 93193323Sed} 94193323Sed 95193323Sedstatic void __inline 96193323Sedg_disk_unlock_giant(struct disk *dp) 97288943Sdim{ 98193323Sed if (dp->d_flags & DISKFLAG_NOGIANT) 99206274Srdivacky return; 100193323Sed mtx_unlock(&Giant); 101193323Sed} 102276479Sdim 103193323Sedstatic int 104193323Sedg_disk_access(struct g_provider *pp, int r, int w, int e) 105193323Sed{ 106193323Sed struct disk *dp; 107193323Sed int error; 108193323Sed 109206274Srdivacky g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 110226633Sdim pp->name, r, w, e); 111193323Sed g_topology_assert(); 112193323Sed r += pp->acr; 113206274Srdivacky w += pp->acw; 114202878Srdivacky e += pp->ace; 115193323Sed dp = pp->geom->softc; 116193323Sed if (dp == NULL) 117193323Sed return (ENXIO); 118206274Srdivacky error = 0; 119206274Srdivacky if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 120193323Sed if (dp->d_open != NULL) { 121193323Sed g_disk_lock_giant(dp); 122296417Sdim error = dp->d_open(dp); 123198090Srdivacky if (error != 0) 124193323Sed printf("Opened disk %s -> %d\n", 125198090Srdivacky pp->name, error); 126193323Sed g_disk_unlock_giant(dp); 127193323Sed } 128193323Sed pp->mediasize = dp->d_mediasize; 129276479Sdim pp->sectorsize = dp->d_sectorsize; 130198090Srdivacky dp->d_flags |= DISKFLAG_OPEN; 131193323Sed if (dp->d_maxsize == 0) { 132193323Sed printf("WARNING: Disk drive %s%d has no d_maxsize\n", 133193323Sed dp->d_name, dp->d_unit); 134193323Sed dp->d_maxsize = DFLTPHYS; 135193323Sed } 136193323Sed } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 137198090Srdivacky if (dp->d_close != NULL) { 138193323Sed g_disk_lock_giant(dp); 139193323Sed error = dp->d_close(dp); 140296417Sdim if (error != 0) 141296417Sdim printf("Closed disk %s -> %d\n", 142201360Srdivacky pp->name, error); 143193323Sed g_disk_unlock_giant(dp); 144288943Sdim } 145288943Sdim dp->d_flags &= ~DISKFLAG_OPEN; 146296417Sdim } 147288943Sdim return (error); 148288943Sdim} 149288943Sdim 150288943Sdimstatic void 151276479Sdimg_disk_kerneldump(struct bio *bp, struct disk *dp) 152251662Sdim{ 153276479Sdim int error; 154276479Sdim struct g_kerneldump *gkd; 155261991Sdim struct dumperinfo di; 156261991Sdim struct g_geom *gp; 157261991Sdim 158261991Sdim gkd = (struct g_kerneldump*)bp->bio_data; 159276479Sdim gp = bp->bio_to->geom; 160261991Sdim g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 161276479Sdim gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 162261991Sdim di.dumper = dp->d_dump; 163249423Sdim di.priv = dp; 164276479Sdim di.blocksize = dp->d_sectorsize; 165276479Sdim di.mediaoffset = gkd->offset; 166249423Sdim di.mediasize = gkd->length; 167249423Sdim error = set_dumper(&di); 168249423Sdim g_io_deliver(bp, error); 169276479Sdim} 170249423Sdim 171249423Sdimstatic void 172288943Sdimg_disk_done(struct bio *bp) 173261991Sdim{ 174261991Sdim struct bio *bp2; 175288943Sdim struct disk *dp; 176288943Sdim 177288943Sdim /* See "notes" for why we need a mutex here */ 178288943Sdim /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 179261991Sdim mtx_lock(&g_disk_done_mtx); 180261991Sdim bp->bio_completed = bp->bio_length - bp->bio_resid; 181296417Sdim 182296417Sdim bp2 = bp->bio_parent; 183296417Sdim dp = bp2->bio_to->geom->softc; 184296417Sdim if (bp2->bio_error == 0) 185296417Sdim bp2->bio_error = bp->bio_error; 186296417Sdim bp2->bio_completed += bp->bio_completed; 187296417Sdim g_destroy_bio(bp); 188296417Sdim bp2->bio_inbed++; 189296417Sdim if (bp2->bio_children == bp2->bio_inbed) { 190296417Sdim bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed; 191296417Sdim devstat_end_transaction_bio(dp->d_devstat, bp2); 192296417Sdim g_io_deliver(bp2, bp2->bio_error); 193296417Sdim } 194296417Sdim mtx_unlock(&g_disk_done_mtx); 195296417Sdim} 196296417Sdim 197296417Sdimstatic int 198251662Sdimg_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, struct thread *td) 199193323Sed{ 200296417Sdim struct g_geom *gp; 201296417Sdim struct disk *dp; 202193323Sed int error; 203296417Sdim 204296417Sdim gp = pp->geom; 205193323Sed dp = gp->softc; 206193323Sed 207296417Sdim if (dp->d_ioctl == NULL) 208193323Sed return (ENOIOCTL); 209296417Sdim g_disk_lock_giant(dp); 210288943Sdim error = dp->d_ioctl(dp, cmd, data, 0, td); 211288943Sdim g_disk_unlock_giant(dp); 212193323Sed return(error); 213193323Sed} 214193323Sed 215193323Sedstatic void 216288943Sdimg_disk_start(struct bio *bp) 217288943Sdim{ 218193323Sed struct bio *bp2, *bp3; 219296417Sdim struct disk *dp; 220193323Sed int error; 221193323Sed off_t off; 222296417Sdim 223193323Sed dp = bp->bio_to->geom->softc; 224201360Srdivacky if (dp == NULL) 225193323Sed g_io_deliver(bp, ENXIO); 226193323Sed error = EJUSTRETURN; 227288943Sdim switch(bp->bio_cmd) { 228288943Sdim case BIO_DELETE: 229288943Sdim if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 230288943Sdim error = 0; 231288943Sdim break; 232288943Sdim } 233288943Sdim /* fall-through */ 234288943Sdim case BIO_READ: 235288943Sdim case BIO_WRITE: 236288943Sdim off = 0; 237288943Sdim bp3 = NULL; 238193323Sed bp2 = g_clone_bio(bp); 239288943Sdim if (bp2 == NULL) { 240288943Sdim error = ENOMEM; 241288943Sdim break; 242288943Sdim } 243288943Sdim devstat_start_transaction_bio(dp->d_devstat, bp); 244288943Sdim do { 245288943Sdim bp2->bio_offset += off; 246288943Sdim bp2->bio_length -= off; 247288943Sdim bp2->bio_data += off; 248288943Sdim if (bp2->bio_length > dp->d_maxsize) { 249288943Sdim /* 250288943Sdim * XXX: If we have a stripesize we should really 251296417Sdim * use it here. 252288943Sdim */ 253288943Sdim bp2->bio_length = dp->d_maxsize; 254288943Sdim off += dp->d_maxsize; 255288943Sdim /* 256288943Sdim * To avoid a race, we need to grab the next bio 257288943Sdim * before we schedule this one. See "notes". 258288943Sdim */ 259288943Sdim bp3 = g_clone_bio(bp); 260288943Sdim if (bp3 == NULL) 261288943Sdim bp->bio_error = ENOMEM; 262288943Sdim } 263288943Sdim bp2->bio_done = g_disk_done; 264296417Sdim bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 265261991Sdim bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 266201360Srdivacky bp2->bio_bcount = bp2->bio_length; 267193323Sed bp2->bio_disk = dp; 268193323Sed g_disk_lock_giant(dp); 269193323Sed dp->d_strategy(bp2); 270193323Sed g_disk_unlock_giant(dp); 271193323Sed bp2 = bp3; 272193323Sed bp3 = NULL; 273193323Sed } while (bp2 != NULL); 274193323Sed break; 275288943Sdim case BIO_GETATTR: 276202878Srdivacky if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 277193323Sed break; 278243830Sdim else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 279243830Sdim break; 280243830Sdim else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 281288943Sdim break; 282243830Sdim else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 283193323Sed g_disk_kerneldump(bp, dp); 284193323Sed else 285202878Srdivacky error = ENOIOCTL; 286193323Sed break; 287202878Srdivacky default: 288249423Sdim error = EOPNOTSUPP; 289288943Sdim break; 290193323Sed } 291202878Srdivacky if (error != EJUSTRETURN) 292193323Sed g_io_deliver(bp, error); 293276479Sdim return; 294202878Srdivacky} 295249423Sdim 296249423Sdimstatic void 297206274Srdivackyg_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 298206274Srdivacky{ 299243830Sdim struct disk *dp; 300296417Sdim 301296417Sdim dp = gp->softc; 302288943Sdim if (dp == NULL) 303288943Sdim return; 304288943Sdim if (indent == NULL) { 305198090Srdivacky sbuf_printf(sb, " hd %u", dp->d_fwheads); 306193323Sed sbuf_printf(sb, " sc %u", dp->d_fwsectors); 307288943Sdim return; 308193323Sed } 309193323Sed if (pp != NULL) { 310193323Sed sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 311193323Sed indent, dp->d_fwheads); 312288943Sdim sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 313193323Sed indent, dp->d_fwsectors); 314243830Sdim } 315193323Sed} 316193323Sed 317193323Sedstatic void 318193323Sedg_disk_create(void *arg, int flag) 319193323Sed{ 320249423Sdim struct g_geom *gp; 321288943Sdim struct g_provider *pp; 322193323Sed struct disk *dp; 323193323Sed 324193323Sed if (flag == EV_CANCEL) 325276479Sdim return; 326193323Sed g_topology_assert(); 327276479Sdim dp = arg; 328276479Sdim gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 329276479Sdim gp->start = g_disk_start; 330276479Sdim gp->access = g_disk_access; 331296417Sdim gp->ioctl = g_disk_ioctl; 332296417Sdim gp->softc = dp; 333288943Sdim gp->dumpconf = g_disk_dumpconf; 334288943Sdim pp = g_new_providerf(gp, "%s", gp->name); 335296417Sdim pp->mediasize = dp->d_mediasize; 336288943Sdim pp->sectorsize = dp->d_sectorsize; 337234353Sdim if (dp->d_flags & DISKFLAG_CANDELETE) 338193323Sed pp->flags |= G_PF_CANDELETE; 339193323Sed pp->stripeoffset = dp->d_stripeoffset; 340193323Sed pp->stripesize = dp->d_stripesize; 341296417Sdim if (bootverbose) 342261991Sdim printf("GEOM: new disk %s\n", gp->name); 343234353Sdim dp->d_geom = gp; 344234353Sdim g_error_provider(pp, 0); 345193323Sed} 346193323Sed 347193323Sedstatic void 348261991Sdimg_disk_destroy(void *ptr, int flag) 349261991Sdim{ 350261991Sdim struct g_geom *gp; 351261991Sdim 352261991Sdim g_topology_assert(); 353288943Sdim gp = ptr; 354288943Sdim gp->softc = NULL; 355261991Sdim g_wither_geom(gp, ENXIO); 356261991Sdim} 357261991Sdim 358261991Sdimvoid 359288943Sdimdisk_create(int unit, struct disk *dp, int flags, void *unused __unused, void * unused2 __unused) 360261991Sdim{ 361261991Sdim 362261991Sdim dp->d_unit = unit; 363296417Sdim dp->d_flags = flags; 364261991Sdim KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 365261991Sdim KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 366296417Sdim KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 367288943Sdim KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 368261991Sdim if (bootverbose || 1) 369261991Sdim printf("GEOM: create disk %s%d dp=%p\n", 370204961Srdivacky dp->d_name, dp->d_unit, dp); 371193323Sed if (dp->d_devstat == NULL) 372193323Sed dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit, 373193323Sed dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED, 374193323Sed DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX); 375288943Sdim dp->d_geom = NULL; 376261991Sdim g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL); 377261991Sdim} 378261991Sdim 379261991Sdimvoid 380193323Seddisk_destroy(struct disk *dp) 381193323Sed{ 382193323Sed struct g_geom *gp; 383193323Sed 384288943Sdim if (bootverbose || 1) 385193323Sed printf("GEOM: destroy disk %s%d dp=%p\n", 386249423Sdim dp->d_name, dp->d_unit, dp); 387234353Sdim g_cancel_event(dp); 388296417Sdim gp = dp->d_geom; 389193323Sed if (gp == NULL) 390193323Sed return; 391296417Sdim gp->softc = NULL; 392288943Sdim devstat_remove_entry(dp->d_devstat); 393193323Sed g_waitfor_event(g_disk_destroy, gp, M_WAITOK, NULL, NULL); 394193323Sed dp->d_geom = NULL; 395193323Sed} 396193323Sed 397193323Sedstatic void 398193323Sedg_kern_disks(void *p, int flag __unused) 399193323Sed{ 400288943Sdim struct sbuf *sb; 401206274Srdivacky struct g_geom *gp; 402193323Sed char *sp; 403193323Sed 404193323Sed sb = p; 405193323Sed sp = ""; 406288943Sdim g_topology_assert(); 407193323Sed LIST_FOREACH(gp, &g_disk_class.geom, geom) { 408261991Sdim sbuf_printf(sb, "%s%s", sp, gp->name); 409234353Sdim sp = " "; 410296417Sdim } 411193323Sed sbuf_finish(sb); 412193323Sed} 413296417Sdim 414261991Sdimstatic int 415204961Srdivackysysctl_disks(SYSCTL_HANDLER_ARGS) 416193323Sed{ 417193323Sed int error; 418193323Sed struct sbuf *sb; 419261991Sdim 420261991Sdim sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 421261991Sdim sbuf_clear(sb); 422261991Sdim g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL); 423261991Sdim error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 424288943Sdim sbuf_delete(sb); 425288943Sdim return error; 426288943Sdim} 427288943Sdim 428288943SdimSYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 429288943Sdim sysctl_disks, "A", "names of available disks"); 430288943Sdim 431288943Sdim