geom_disk.c revision 105350
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 105350 2002-10-17 19:27:02Z phk $ 3692108Sphk */ 3792108Sphk 38104519Sphk#include "opt_geom.h" 39104519Sphk#ifndef NO_GEOM 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> 4792108Sphk#include <sys/disk.h> 48103714Sphk#include <sys/diskslice.h> 49103714Sphk#include <sys/disklabel.h> 5092108Sphk#include <sys/malloc.h> 5192108Sphk#include <sys/sysctl.h> 52103284Sphk#include <sys/stdint.h> 5392108Sphk#include <machine/md_var.h> 5492108Sphk 5592108Sphk 5692108Sphk#include <sys/lock.h> 5792108Sphk#include <sys/mutex.h> 5892108Sphk#include <geom/geom.h> 5992108Sphk 6092108Sphkstatic g_access_t g_disk_access; 6192108Sphk 6293248Sphkstruct g_class g_disk_class = { 6397075Sphk "DISK", 6492108Sphk NULL, 6592108Sphk NULL, 6698066Sphk G_CLASS_INITIALIZER 6792108Sphk}; 6892108Sphk 69104936SphkDECLARE_GEOM_CLASS(g_disk_class, g_disk); 70104936Sphk 7192108Sphkstatic int 7292108Sphkg_disk_access(struct g_provider *pp, int r, int w, int e) 7392108Sphk{ 7492108Sphk struct disk *dp; 7592108Sphk dev_t dev; 7692108Sphk int error; 7792108Sphk 7892108Sphk g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 7992108Sphk pp->name, r, w, e); 8092108Sphk g_topology_assert(); 8192108Sphk r += pp->acr; 8292108Sphk w += pp->acw; 8392108Sphk e += pp->ace; 8492108Sphk dp = pp->geom->softc; 8592108Sphk dev = dp->d_dev; 8692108Sphk if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 8792108Sphk mtx_lock(&Giant); 8892108Sphk error = devsw(dev)->d_open(dev, 3, 0, NULL); 8992108Sphk if (error != 0) 9092108Sphk printf("Opened disk %s -> %d\n", pp->name, error); 9192108Sphk mtx_unlock(&Giant); 9292108Sphk } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 9392108Sphk mtx_lock(&Giant); 9492108Sphk error = devsw(dev)->d_close(dev, 3, 0, NULL); 9592108Sphk if (error != 0) 9692108Sphk printf("Closed disk %s -> %d\n", pp->name, error); 9792108Sphk mtx_unlock(&Giant); 9892108Sphk } else { 9992108Sphk error = 0; 10092108Sphk } 101103714Sphk pp->mediasize = dp->d_mediasize; 10292108Sphk return (error); 10392108Sphk} 10492108Sphk 10592108Sphkstatic void 10695038Sphkg_disk_kerneldump(struct bio *bp, struct disk *dp) 10795038Sphk{ 10895038Sphk int error; 10995038Sphk struct g_kerneldump *gkd; 11095038Sphk struct dumperinfo di; 111104450Sphk struct g_geom *gp; 11295038Sphk 11395038Sphk gkd = (struct g_kerneldump*)bp->bio_data; 114104450Sphk gp = bp->bio_to->geom; 115104450Sphk g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 116104450Sphk gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 11795038Sphk di.dumper = (dumper_t *)dp->d_devsw->d_dump; 11895038Sphk di.priv = dp->d_dev; 119103714Sphk di.blocksize = dp->d_sectorsize; 12095038Sphk di.mediaoffset = gkd->offset; 12195038Sphk di.mediasize = gkd->length; 12295038Sphk error = set_dumper(&di); 123104195Sphk g_io_deliver(bp, error); 12495038Sphk} 12595038Sphk 12695038Sphkstatic void 12792108Sphkg_disk_done(struct bio *bp) 12892108Sphk{ 12992108Sphk 13092108Sphk mtx_unlock(&Giant); 13192108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 13292108Sphk g_std_done(bp); 13392108Sphk mtx_lock(&Giant); 13492108Sphk} 13592108Sphk 13692108Sphkstatic void 13792108Sphkg_disk_start(struct bio *bp) 13892108Sphk{ 13992108Sphk struct bio *bp2; 14092108Sphk dev_t dev; 14192108Sphk struct disk *dp; 14292403Sphk struct g_ioctl *gio; 14392403Sphk int error; 14492108Sphk 14592108Sphk dp = bp->bio_to->geom->softc; 14692108Sphk dev = dp->d_dev; 147104609Sphk error = EJUSTRETURN; 14892108Sphk switch(bp->bio_cmd) { 149104609Sphk case BIO_DELETE: 150104609Sphk if (!(devsw(dev)->d_flags & D_CANFREE)) { 151104609Sphk error = 0; 152104609Sphk break; 153104609Sphk } 154104609Sphk /* fall-through */ 15592108Sphk case BIO_READ: 15692108Sphk case BIO_WRITE: 15792108Sphk bp2 = g_clone_bio(bp); 15892108Sphk bp2->bio_done = g_disk_done; 15992108Sphk bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 160104609Sphk bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize; 16192108Sphk bp2->bio_bcount = bp2->bio_length; 16292108Sphk bp2->bio_dev = dev; 16392108Sphk mtx_lock(&Giant); 16492108Sphk devsw(dev)->d_strategy(bp2); 16592108Sphk mtx_unlock(&Giant); 16692108Sphk break; 16792108Sphk case BIO_GETATTR: 168103714Sphk if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 16992403Sphk break; 170103714Sphk else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 17192403Sphk break; 172103714Sphk else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 17392403Sphk break; 174103714Sphk else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 17592403Sphk break; 17698066Sphk else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 17794287Sphk break; 17895038Sphk else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 17995038Sphk g_disk_kerneldump(bp, dp); 18092403Sphk else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 18192403Sphk bp->bio_length == sizeof *gio) { 182104602Sphk gio = (struct g_ioctl *)bp->bio_data; 183104602Sphk gio->func = devsw(dp->d_dev)->d_ioctl; 184104602Sphk gio->dev = dp->d_dev; 185104602Sphk error = EDIRIOCTL; 18692403Sphk } else 18792403Sphk error = ENOIOCTL; 18892403Sphk break; 189104542Sphk case BIO_SETATTR: 190104542Sphk if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 191104542Sphk bp->bio_length == sizeof *gio) { 192104602Sphk gio = (struct g_ioctl *)bp->bio_data; 193104602Sphk gio->func = devsw(dp->d_dev)->d_ioctl; 194104602Sphk gio->dev = dp->d_dev; 195104602Sphk error = EDIRIOCTL; 196104542Sphk } else 197104542Sphk error = ENOIOCTL; 198104542Sphk break; 19992108Sphk default: 20092403Sphk error = EOPNOTSUPP; 20192403Sphk break; 20292403Sphk } 203104609Sphk if (error != EJUSTRETURN) 204104195Sphk g_io_deliver(bp, error); 20592403Sphk return; 20692108Sphk} 20792108Sphk 208104936Sphkstatic void 209104936Sphkg_disk_create(void *arg) 21092108Sphk{ 21192108Sphk struct g_geom *gp; 21292108Sphk struct g_provider *pp; 21392108Sphk dev_t dev; 21492108Sphk 215104936Sphk g_topology_assert(); 216104936Sphk dev = arg; 217104936Sphk gp = g_new_geomf(&g_disk_class, dev->si_name); 218104936Sphk gp->start = g_disk_start; 219104936Sphk gp->access = g_disk_access; 220104936Sphk gp->softc = dev->si_disk; 221104936Sphk dev->si_disk->d_softc = gp; 222104936Sphk pp = g_new_providerf(gp, "%s", gp->name); 223104936Sphk g_error_provider(pp, 0); 224104936Sphk} 225104936Sphk 226104936Sphk 227104936Sphk 228104936Sphkdev_t 229104936Sphkdisk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 230104936Sphk{ 231104936Sphk dev_t dev; 232104936Sphk 23392108Sphk dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 23492108Sphk dp->d_dev = dev; 23593642Sphk dp->d_devsw = cdevsw; 23692108Sphk dev->si_devsw = cdevsw; 23792108Sphk dev->si_disk = dp; 23892108Sphk dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 239104936Sphk sprintf(dev->si_name, "%s%d", cdevsw->d_name, unit); 240104936Sphk g_call_me(g_disk_create, dev); 24192108Sphk return (dev); 24292108Sphk} 24392108Sphk 24492108Sphkvoid disk_dev_synth(dev_t dev); 24592108Sphk 24692108Sphkvoid 24792108Sphkdisk_dev_synth(dev_t dev) 24892108Sphk{ 24992108Sphk 25092108Sphk return; 25192108Sphk} 25292108Sphk 25392108Sphkvoid 25492108Sphkdisk_destroy(dev_t dev) 25592108Sphk{ 25692108Sphk struct disk *dp; 25792108Sphk struct g_geom *gp; 25892108Sphk 25992108Sphk dp = dev->si_disk; 26092108Sphk gp = dp->d_softc; 26192108Sphk g_free(dev); 26292108Sphk gp->flags |= G_GEOM_WITHER; 26392108Sphk g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 26492108Sphk} 26592108Sphk 26692108Sphkvoid 26792108Sphkdisk_invalidate (struct disk *disk) 26892108Sphk{ 26992108Sphk} 27092108Sphk 271104451Sphkstatic void 272104451Sphkg_kern_disks(void *p) 273104451Sphk{ 274104451Sphk struct sbuf *sb; 275104451Sphk struct g_geom *gp; 276104451Sphk char *sp; 277104451Sphk 278104451Sphk sb = p; 279104451Sphk sp = ""; 280104451Sphk g_topology_assert(); 281104451Sphk LIST_FOREACH(gp, &g_disk_class.geom, geom) { 282104451Sphk sbuf_printf(sb, "%s%s", sp, gp->name); 283104451Sphk sp = " "; 284104451Sphk } 285104451Sphk sbuf_finish(sb); 286104451Sphk wakeup(sb); 287104451Sphk} 288104451Sphk 289104451Sphkstatic int 290104451Sphksysctl_disks(SYSCTL_HANDLER_ARGS) 291104451Sphk{ 292104451Sphk int error; 293104451Sphk struct sbuf *sb; 294104451Sphk 295104451Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 296104451Sphk sbuf_clear(sb); 297104451Sphk g_call_me(g_kern_disks, sb); 298104451Sphk do { 299104451Sphk tsleep(sb, PZERO, "kern.disks", hz); 300104451Sphk } while(!sbuf_done(sb)); 301105350Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1); 302104451Sphk sbuf_delete(sb); 303104451Sphk return error; 304104451Sphk} 305104451Sphk 306104451SphkSYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 307104451Sphk sysctl_disks, "A", "names of available disks"); 308104519Sphk 309104519Sphk#endif 310