geom_disk.c revision 104602
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 104602 2002-10-07 06:25:26Z 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 6992108Sphkstatic int 7092108Sphkg_disk_access(struct g_provider *pp, int r, int w, int e) 7192108Sphk{ 7292108Sphk struct disk *dp; 7392108Sphk dev_t dev; 7492108Sphk int error; 7592108Sphk 7692108Sphk g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 7792108Sphk pp->name, r, w, e); 7892108Sphk g_topology_assert(); 7992108Sphk r += pp->acr; 8092108Sphk w += pp->acw; 8192108Sphk e += pp->ace; 8292108Sphk dp = pp->geom->softc; 8392108Sphk dev = dp->d_dev; 8492108Sphk if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 8592108Sphk mtx_lock(&Giant); 8692108Sphk error = devsw(dev)->d_open(dev, 3, 0, NULL); 8792108Sphk if (error != 0) 8892108Sphk printf("Opened disk %s -> %d\n", pp->name, error); 8992108Sphk mtx_unlock(&Giant); 9092108Sphk } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 9192108Sphk mtx_lock(&Giant); 9292108Sphk error = devsw(dev)->d_close(dev, 3, 0, NULL); 9392108Sphk if (error != 0) 9492108Sphk printf("Closed disk %s -> %d\n", pp->name, error); 9592108Sphk mtx_unlock(&Giant); 9692108Sphk } else { 9792108Sphk error = 0; 9892108Sphk } 99103714Sphk pp->mediasize = dp->d_mediasize; 10092108Sphk return (error); 10192108Sphk} 10292108Sphk 10392108Sphkstatic void 10495038Sphkg_disk_kerneldump(struct bio *bp, struct disk *dp) 10595038Sphk{ 10695038Sphk int error; 10795038Sphk struct g_kerneldump *gkd; 10895038Sphk struct dumperinfo di; 109104450Sphk struct g_geom *gp; 11095038Sphk 11195038Sphk gkd = (struct g_kerneldump*)bp->bio_data; 112104450Sphk gp = bp->bio_to->geom; 113104450Sphk g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 114104450Sphk gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 11595038Sphk di.dumper = (dumper_t *)dp->d_devsw->d_dump; 11695038Sphk di.priv = dp->d_dev; 117103714Sphk di.blocksize = dp->d_sectorsize; 11895038Sphk di.mediaoffset = gkd->offset; 11995038Sphk di.mediasize = gkd->length; 12095038Sphk error = set_dumper(&di); 121104195Sphk g_io_deliver(bp, error); 12295038Sphk} 12395038Sphk 12495038Sphkstatic void 12592108Sphkg_disk_done(struct bio *bp) 12692108Sphk{ 12792108Sphk 12892108Sphk mtx_unlock(&Giant); 12992108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 13092108Sphk g_std_done(bp); 13192108Sphk mtx_lock(&Giant); 13292108Sphk} 13392108Sphk 13492108Sphkstatic void 13592108Sphkg_disk_start(struct bio *bp) 13692108Sphk{ 13792108Sphk struct bio *bp2; 13892108Sphk dev_t dev; 13992108Sphk struct disk *dp; 14092403Sphk struct g_ioctl *gio; 14192403Sphk int error; 14292108Sphk 14392108Sphk dp = bp->bio_to->geom->softc; 14492108Sphk dev = dp->d_dev; 14592403Sphk error = 0; 14692108Sphk switch(bp->bio_cmd) { 14792108Sphk case BIO_READ: 14892108Sphk case BIO_WRITE: 14992108Sphk bp2 = g_clone_bio(bp); 15092108Sphk bp2->bio_done = g_disk_done; 15192108Sphk bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 15292108Sphk bp2->bio_pblkno = bp2->bio_blkno; 15392108Sphk bp2->bio_bcount = bp2->bio_length; 15492108Sphk bp2->bio_dev = dev; 15592108Sphk mtx_lock(&Giant); 15692108Sphk devsw(dev)->d_strategy(bp2); 15792108Sphk mtx_unlock(&Giant); 15892108Sphk break; 15992108Sphk case BIO_GETATTR: 160103714Sphk if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 16192403Sphk break; 162103714Sphk else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 16392403Sphk break; 164103714Sphk else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 16592403Sphk break; 166103714Sphk else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 16792403Sphk break; 16898066Sphk else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 16994287Sphk break; 17095038Sphk else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 17195038Sphk g_disk_kerneldump(bp, dp); 17292403Sphk else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 17392403Sphk bp->bio_length == sizeof *gio) { 174104602Sphk gio = (struct g_ioctl *)bp->bio_data; 175104602Sphk gio->func = devsw(dp->d_dev)->d_ioctl; 176104602Sphk gio->dev = dp->d_dev; 177104602Sphk error = EDIRIOCTL; 17892403Sphk } else 17992403Sphk error = ENOIOCTL; 18092403Sphk break; 181104542Sphk case BIO_SETATTR: 182104542Sphk if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 183104542Sphk bp->bio_length == sizeof *gio) { 184104602Sphk gio = (struct g_ioctl *)bp->bio_data; 185104602Sphk gio->func = devsw(dp->d_dev)->d_ioctl; 186104602Sphk gio->dev = dp->d_dev; 187104602Sphk error = EDIRIOCTL; 188104542Sphk } else 189104542Sphk error = ENOIOCTL; 190104542Sphk break; 19192108Sphk default: 19292403Sphk error = EOPNOTSUPP; 19392403Sphk break; 19492403Sphk } 19592403Sphk if (error) { 196104195Sphk g_io_deliver(bp, error); 19792108Sphk } 19892403Sphk return; 19992108Sphk} 20092108Sphk 20192108Sphkdev_t 20292108Sphkdisk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 20392108Sphk{ 20492108Sphk static int once; 20592108Sphk struct g_geom *gp; 20692108Sphk struct g_provider *pp; 20792108Sphk dev_t dev; 20892108Sphk 20992108Sphk mtx_unlock(&Giant); 21092108Sphk if (!once) { 21193248Sphk g_add_class(&g_disk_class); 21292108Sphk once++; 21392108Sphk } 21492108Sphk dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 21592108Sphk dp->d_dev = dev; 21693642Sphk dp->d_devsw = cdevsw; 21792108Sphk dev->si_devsw = cdevsw; 21892108Sphk dev->si_disk = dp; 21992108Sphk dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 22092108Sphk g_topology_lock(); 22193248Sphk gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 22297317Sphk strcpy(dev->si_name, gp->name); 22392108Sphk gp->start = g_disk_start; 22493776Sphk gp->access = g_disk_access; 22592108Sphk gp->softc = dp; 22692108Sphk dp->d_softc = gp; 22792108Sphk pp = g_new_providerf(gp, "%s", gp->name); 22892108Sphk g_error_provider(pp, 0); 22992108Sphk g_topology_unlock(); 23092108Sphk mtx_lock(&Giant); 23192108Sphk return (dev); 23292108Sphk} 23392108Sphk 23492108Sphkvoid disk_dev_synth(dev_t dev); 23592108Sphk 23692108Sphkvoid 23792108Sphkdisk_dev_synth(dev_t dev) 23892108Sphk{ 23992108Sphk 24092108Sphk return; 24192108Sphk} 24292108Sphk 24392108Sphkvoid 24492108Sphkdisk_destroy(dev_t dev) 24592108Sphk{ 24692108Sphk struct disk *dp; 24792108Sphk struct g_geom *gp; 24892108Sphk 24992108Sphk dp = dev->si_disk; 25092108Sphk gp = dp->d_softc; 25192108Sphk g_free(dev); 25292108Sphk gp->flags |= G_GEOM_WITHER; 25392108Sphk g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 25492108Sphk} 25592108Sphk 25692108Sphkvoid 25792108Sphkdisk_invalidate (struct disk *disk) 25892108Sphk{ 25992108Sphk} 26092108Sphk 261104451Sphkstatic void 262104451Sphkg_kern_disks(void *p) 263104451Sphk{ 264104451Sphk struct sbuf *sb; 265104451Sphk struct g_geom *gp; 266104451Sphk char *sp; 267104451Sphk 268104451Sphk sb = p; 269104451Sphk sp = ""; 270104451Sphk g_topology_assert(); 271104451Sphk LIST_FOREACH(gp, &g_disk_class.geom, geom) { 272104451Sphk sbuf_printf(sb, "%s%s", sp, gp->name); 273104451Sphk sp = " "; 274104451Sphk } 275104451Sphk sbuf_finish(sb); 276104451Sphk wakeup(sb); 277104451Sphk} 278104451Sphk 279104451Sphkstatic int 280104451Sphksysctl_disks(SYSCTL_HANDLER_ARGS) 281104451Sphk{ 282104451Sphk int error; 283104451Sphk struct sbuf *sb; 284104451Sphk 285104451Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 286104451Sphk sbuf_clear(sb); 287104451Sphk g_call_me(g_kern_disks, sb); 288104451Sphk do { 289104451Sphk tsleep(sb, PZERO, "kern.disks", hz); 290104451Sphk } while(!sbuf_done(sb)); 291104451Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb)); 292104451Sphk sbuf_delete(sb); 293104451Sphk return error; 294104451Sphk} 295104451Sphk 296104451SphkSYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 297104451Sphk sysctl_disks, "A", "names of available disks"); 298104519Sphk 299104519Sphk#endif 300