geom_disk.c revision 111220
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 * $FreeBSD: head/sys/geom/geom_disk.c 111220 2003-02-21 19:00:48Z phk $ 3692108Sphk */ 3792108Sphk 38104519Sphk#include "opt_geom.h" 39104519Sphk 4092108Sphk#include <sys/param.h> 4192108Sphk#include <sys/systm.h> 4292108Sphk#include <sys/kernel.h> 4392108Sphk#include <sys/sysctl.h> 4492108Sphk#include <sys/bio.h> 4592108Sphk#include <sys/conf.h> 4692108Sphk#include <sys/disk.h> 47110119Sphk#include <sys/fcntl.h> 4892108Sphk#include <sys/malloc.h> 4992108Sphk#include <sys/sysctl.h> 50103284Sphk#include <sys/stdint.h> 5192108Sphk#include <machine/md_var.h> 5292108Sphk 5392108Sphk#include <sys/lock.h> 5492108Sphk#include <sys/mutex.h> 5592108Sphk#include <geom/geom.h> 5692108Sphk 57110720Sphkstatic struct mtx g_disk_done_mtx; 58110720Sphk 5992108Sphkstatic g_access_t g_disk_access; 6092108Sphk 6193248Sphkstruct g_class g_disk_class = { 6297075Sphk "DISK", 6392108Sphk NULL, 6492108Sphk NULL, 6598066Sphk G_CLASS_INITIALIZER 6692108Sphk}; 6792108Sphk 68110720Sphkstatic void 69110720Sphkg_disk_init(void) 70110720Sphk{ 71110720Sphk mtx_unlock(&Giant); 72110720Sphk g_add_class(&g_disk_class); 73110720Sphk mtx_init(&g_disk_done_mtx, "g_disk_done", MTX_DEF, 0); 74110720Sphk mtx_lock(&Giant); 75110720Sphk} 76104936Sphk 77110720SphkDECLARE_GEOM_CLASS_INIT(g_disk_class, g_disk, g_disk_init); 78110720Sphk 79110052Sphkstatic void __inline 80110052Sphkg_disk_lock_giant(struct disk *dp) 81110052Sphk{ 82110119Sphk if (dp->d_flags & DISKFLAG_NOGIANT) 83110119Sphk return; 84110119Sphk mtx_lock(&Giant); 85110052Sphk} 86110052Sphk 87110052Sphkstatic void __inline 88110052Sphkg_disk_unlock_giant(struct disk *dp) 89110052Sphk{ 90110119Sphk if (dp->d_flags & DISKFLAG_NOGIANT) 91110119Sphk return; 92110119Sphk mtx_unlock(&Giant); 93110052Sphk} 94110052Sphk 9592108Sphkstatic int 9692108Sphkg_disk_access(struct g_provider *pp, int r, int w, int e) 9792108Sphk{ 9892108Sphk struct disk *dp; 9992108Sphk dev_t dev; 10092108Sphk int error; 10192108Sphk 10292108Sphk g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 10392108Sphk pp->name, r, w, e); 10492108Sphk g_topology_assert(); 10592108Sphk r += pp->acr; 10692108Sphk w += pp->acw; 10792108Sphk e += pp->ace; 10892108Sphk dp = pp->geom->softc; 10992108Sphk dev = dp->d_dev; 110110119Sphk error = 0; 11192108Sphk if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 112110419Sphk if (dp->d_open != NULL || dp->d_copen != NULL) { 113110119Sphk g_disk_lock_giant(dp); 114110419Sphk if (dp->d_open != NULL) 115110419Sphk error = dp->d_open(dp); 116110419Sphk else 117110419Sphk error = dp->d_copen(dev, FREAD|FWRITE, 0, NULL); 118110119Sphk if (error != 0) 119110119Sphk printf("Opened disk %s -> %d\n", 120110119Sphk pp->name, error); 121110119Sphk g_disk_unlock_giant(dp); 122110119Sphk } 123105551Sphk pp->mediasize = dp->d_mediasize; 124105551Sphk pp->sectorsize = dp->d_sectorsize; 125110119Sphk dp->d_flags |= DISKFLAG_OPEN; 126110727Sphk if (dp->d_maxsize == 0 && dp->d_dev->si_iosize_max != 0) 127110727Sphk dp->d_maxsize = dp->d_dev->si_iosize_max; 128110727Sphk if (dp->d_maxsize == 0) { 129110727Sphk printf("WARNING: Disk drive %s%d has no d_maxsize\n", 130110727Sphk dp->d_name, dp->d_unit); 131110727Sphk dp->d_maxsize = DFLTPHYS; 132110727Sphk } 13392108Sphk } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 134110419Sphk if (dp->d_close != NULL || dp->d_cclose != NULL) { 135110119Sphk g_disk_lock_giant(dp); 136110419Sphk if (dp->d_close != NULL) 137110419Sphk error = dp->d_close(dp); 138110419Sphk else 139110419Sphk error = dp->d_cclose(dev, FREAD|FWRITE, 0, NULL); 140110119Sphk if (error != 0) 141110119Sphk printf("Closed disk %s -> %d\n", 142110119Sphk pp->name, error); 143110119Sphk g_disk_unlock_giant(dp); 144110119Sphk } 145110119Sphk dp->d_flags &= ~DISKFLAG_OPEN; 14692108Sphk } 14792108Sphk return (error); 14892108Sphk} 14992108Sphk 15092108Sphkstatic void 15195038Sphkg_disk_kerneldump(struct bio *bp, struct disk *dp) 15295038Sphk{ 15395038Sphk int error; 15495038Sphk struct g_kerneldump *gkd; 15595038Sphk struct dumperinfo di; 156104450Sphk struct g_geom *gp; 15795038Sphk 15895038Sphk gkd = (struct g_kerneldump*)bp->bio_data; 159104450Sphk gp = bp->bio_to->geom; 160104450Sphk g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 161104450Sphk gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 162110119Sphk di.dumper = dp->d_dump; 163111220Sphk di.priv = dp; 164103714Sphk di.blocksize = dp->d_sectorsize; 16595038Sphk di.mediaoffset = gkd->offset; 16695038Sphk di.mediasize = gkd->length; 16795038Sphk error = set_dumper(&di); 168104195Sphk g_io_deliver(bp, error); 16995038Sphk} 17095038Sphk 17195038Sphkstatic void 17292108Sphkg_disk_done(struct bio *bp) 17392108Sphk{ 17492108Sphk 175110720Sphk /* See "notes" for why we need a mutex here */ 176110720Sphk /* XXX: will witness accept a mix of Giant/unGiant drivers here ? */ 177110720Sphk mtx_lock(&g_disk_done_mtx); 17892108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 179110475Sphk g_std_done(bp); 180110720Sphk mtx_unlock(&g_disk_done_mtx); 18192108Sphk} 18292108Sphk 18392108Sphkstatic void 18492108Sphkg_disk_start(struct bio *bp) 18592108Sphk{ 186110720Sphk struct bio *bp2, *bp3; 18792108Sphk dev_t dev; 18892108Sphk struct disk *dp; 18992403Sphk struct g_ioctl *gio; 19092403Sphk int error; 191110720Sphk off_t off; 19292108Sphk 19392108Sphk dp = bp->bio_to->geom->softc; 19492108Sphk dev = dp->d_dev; 195104609Sphk error = EJUSTRETURN; 19692108Sphk switch(bp->bio_cmd) { 197104609Sphk case BIO_DELETE: 198110119Sphk if (!(dp->d_flags & DISKFLAG_CANDELETE)) { 199104609Sphk error = 0; 200104609Sphk break; 201104609Sphk } 202104609Sphk /* fall-through */ 20392108Sphk case BIO_READ: 20492108Sphk case BIO_WRITE: 205110720Sphk off = 0; 206110720Sphk bp3 = NULL; 20792108Sphk bp2 = g_clone_bio(bp); 208110477Sphk if (bp2 == NULL) { 209110477Sphk error = ENOMEM; 210110477Sphk break; 211110477Sphk } 212110720Sphk do { 213110720Sphk bp2->bio_offset += off; 214110720Sphk bp2->bio_length -= off; 215110766Stegge bp2->bio_data += off; 216110720Sphk if (bp2->bio_length > dp->d_maxsize) { 217110720Sphk /* 218110720Sphk * XXX: If we have a stripesize we should really 219110720Sphk * use it here. 220110720Sphk */ 221110720Sphk bp2->bio_length = dp->d_maxsize; 222110720Sphk off += dp->d_maxsize; 223110720Sphk /* 224110720Sphk * To avoid a race, we need to grab the next bio 225110720Sphk * before we schedule this one. See "notes". 226110720Sphk */ 227110720Sphk bp3 = g_clone_bio(bp); 228110720Sphk if (bp3 == NULL) 229110720Sphk bp->bio_error = ENOMEM; 230110720Sphk } 231110720Sphk bp2->bio_done = g_disk_done; 232110720Sphk bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 233110720Sphk bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 234110720Sphk bp2->bio_bcount = bp2->bio_length; 235110720Sphk bp2->bio_dev = dev; 236110720Sphk bp2->bio_disk = dp; 237110720Sphk g_disk_lock_giant(dp); 238110720Sphk dp->d_strategy(bp2); 239110720Sphk g_disk_unlock_giant(dp); 240110720Sphk bp2 = bp3; 241110720Sphk bp3 = NULL; 242110720Sphk } while (bp2 != NULL); 24392108Sphk break; 24492108Sphk case BIO_GETATTR: 245105551Sphk if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 24692403Sphk break; 247103714Sphk else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 24892403Sphk break; 24998066Sphk else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 25094287Sphk break; 25195038Sphk else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 25295038Sphk g_disk_kerneldump(bp, dp); 253110419Sphk else if ((dp->d_ioctl != NULL || dp->d_cioctl != NULL) && 254110119Sphk !strcmp(bp->bio_attribute, "GEOM::ioctl") && 25592403Sphk bp->bio_length == sizeof *gio) { 256104602Sphk gio = (struct g_ioctl *)bp->bio_data; 257110419Sphk if (dp->d_ioctl != NULL) { 258110419Sphk gio->func = (d_ioctl_t *)(dp->d_ioctl); 259110419Sphk gio->dev = dp; 260110419Sphk } else { 261110419Sphk gio->func = dp->d_cioctl; 262110419Sphk gio->dev = dp->d_dev; 263110419Sphk } 264104602Sphk error = EDIRIOCTL; 26592403Sphk } else 26692403Sphk error = ENOIOCTL; 26792403Sphk break; 268104542Sphk case BIO_SETATTR: 269104542Sphk if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 270104542Sphk bp->bio_length == sizeof *gio) { 271104602Sphk gio = (struct g_ioctl *)bp->bio_data; 272104602Sphk gio->func = devsw(dp->d_dev)->d_ioctl; 273104602Sphk gio->dev = dp->d_dev; 274104602Sphk error = EDIRIOCTL; 275104542Sphk } else 276104542Sphk error = ENOIOCTL; 277104542Sphk break; 27892108Sphk default: 27992403Sphk error = EOPNOTSUPP; 28092403Sphk break; 28192403Sphk } 282104609Sphk if (error != EJUSTRETURN) 283104195Sphk g_io_deliver(bp, error); 28492403Sphk return; 28592108Sphk} 28692108Sphk 287104936Sphkstatic void 288107953Sphkg_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) 289105537Sphk{ 290105537Sphk struct disk *dp; 291105537Sphk 292105537Sphk dp = gp->softc; 293106101Sphk if (indent == NULL) { 294106101Sphk sbuf_printf(sb, " hd %u", dp->d_fwheads); 295106101Sphk sbuf_printf(sb, " sc %u", dp->d_fwsectors); 296106101Sphk return; 297106101Sphk } 298105539Sphk if (pp != NULL) { 299105537Sphk sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n", 300105537Sphk indent, dp->d_fwheads); 301105537Sphk sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n", 302105537Sphk indent, dp->d_fwsectors); 303105537Sphk } 304105537Sphk} 305105537Sphk 306105537Sphkstatic void 307104936Sphkg_disk_create(void *arg) 30892108Sphk{ 30992108Sphk struct g_geom *gp; 31092108Sphk struct g_provider *pp; 311110708Sphk struct disk *dp; 31292108Sphk 313104936Sphk g_topology_assert(); 314110708Sphk dp = arg; 315110708Sphk gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit); 316104936Sphk gp->start = g_disk_start; 317104936Sphk gp->access = g_disk_access; 318110708Sphk gp->softc = dp; 319105537Sphk gp->dumpconf = g_disk_dumpconf; 320110708Sphk dp->d_geom = gp; 321104936Sphk pp = g_new_providerf(gp, "%s", gp->name); 322110708Sphk pp->mediasize = dp->d_mediasize; 323110708Sphk pp->sectorsize = dp->d_sectorsize; 324110708Sphk if (dp->d_flags & DISKFLAG_CANDELETE) 325110708Sphk pp->flags |= G_PF_CANDELETE; 326110710Sphk pp->stripeoffset = dp->d_stripeoffset; 327110710Sphk pp->stripesize = dp->d_stripesize; 328104936Sphk g_error_provider(pp, 0); 329105957Sphk if (bootverbose) 330105957Sphk printf("GEOM: new disk %s\n", gp->name); 331104936Sphk} 332104936Sphk 333104936Sphk 334104936Sphk 335104936Sphkdev_t 336110119Sphkdisk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, void * unused __unused) 337104936Sphk{ 338104936Sphk dev_t dev; 339104936Sphk 340111119Simp dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 341110708Sphk dp->d_unit = unit; 34292108Sphk dp->d_dev = dev; 343110119Sphk dp->d_flags = flags; 34493642Sphk dp->d_devsw = cdevsw; 34592108Sphk dev->si_devsw = cdevsw; 346110119Sphk if (cdevsw != NULL) { 347110419Sphk dp->d_copen = cdevsw->d_open; 348110419Sphk dp->d_cclose = cdevsw->d_close; 349110419Sphk dp->d_cioctl = cdevsw->d_ioctl; 350110119Sphk dp->d_strategy = cdevsw->d_strategy; 351111220Sphk dp->d_dump = cdevsw->d_dump; 352110119Sphk dp->d_name = cdevsw->d_name; 353110119Sphk } 354110119Sphk KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy")); 355110119Sphk KASSERT(dp->d_name != NULL, ("disk_create need d_name")); 356110119Sphk KASSERT(*dp->d_name != 0, ("disk_create need d_name")); 357110317Sphk KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long")); 35892108Sphk dev->si_disk = dp; 359110118Sphk dev->si_udev = 0x10002; /* XXX: Needed ? */ 360110317Sphk dev->si_name = dev->__si_namebuf; 361110119Sphk sprintf(dev->si_name, "%s%d", dp->d_name, unit); 362110708Sphk g_call_me(g_disk_create, dp); 36392108Sphk return (dev); 36492108Sphk} 36592108Sphk 36692108Sphkvoid 367111216Sphkdisk_destroy(struct disk *dp) 36892108Sphk{ 36992108Sphk struct g_geom *gp; 37092108Sphk 371110419Sphk gp = dp->d_geom; 372111216Sphk g_free(dp->d_dev); 37392108Sphk gp->flags |= G_GEOM_WITHER; 374110119Sphk gp->softc = NULL; 37592108Sphk g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 37692108Sphk} 37792108Sphk 378104451Sphkstatic void 379104451Sphkg_kern_disks(void *p) 380104451Sphk{ 381104451Sphk struct sbuf *sb; 382104451Sphk struct g_geom *gp; 383104451Sphk char *sp; 384104451Sphk 385104451Sphk sb = p; 386104451Sphk sp = ""; 387104451Sphk g_topology_assert(); 388104451Sphk LIST_FOREACH(gp, &g_disk_class.geom, geom) { 389104451Sphk sbuf_printf(sb, "%s%s", sp, gp->name); 390104451Sphk sp = " "; 391104451Sphk } 392104451Sphk sbuf_finish(sb); 393104451Sphk wakeup(sb); 394104451Sphk} 395104451Sphk 396104451Sphkstatic int 397104451Sphksysctl_disks(SYSCTL_HANDLER_ARGS) 398104451Sphk{ 399104451Sphk int error; 400104451Sphk struct sbuf *sb; 401104451Sphk 402104451Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 403104451Sphk sbuf_clear(sb); 404104451Sphk g_call_me(g_kern_disks, sb); 405104451Sphk do { 406104451Sphk tsleep(sb, PZERO, "kern.disks", hz); 407104451Sphk } while(!sbuf_done(sb)); 408105350Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 409104451Sphk sbuf_delete(sb); 410104451Sphk return error; 411104451Sphk} 412104451Sphk 413104451SphkSYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 414104451Sphk sysctl_disks, "A", "names of available disks"); 415104519Sphk 416