geom_disk.c revision 104451
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 104451 2002-10-04 10:15:26Z phk $ 3692108Sphk */ 3792108Sphk 3892108Sphk#include <sys/param.h> 3992108Sphk#include <sys/systm.h> 4092108Sphk#include <sys/kernel.h> 4192108Sphk#include <sys/sysctl.h> 4292108Sphk#include <sys/bio.h> 4392108Sphk#include <sys/conf.h> 4492108Sphk#include <sys/disk.h> 45103714Sphk#include <sys/diskslice.h> 46103714Sphk#include <sys/disklabel.h> 4792108Sphk#include <sys/malloc.h> 4892108Sphk#include <sys/sysctl.h> 49103284Sphk#include <sys/stdint.h> 5092108Sphk#include <machine/md_var.h> 5192108Sphk 5292108Sphk 5392108Sphk#include <sys/lock.h> 5492108Sphk#include <sys/mutex.h> 5592108Sphk#include <geom/geom.h> 5692108Sphk 5792108Sphkstatic g_access_t g_disk_access; 5892108Sphk 5993248Sphkstruct g_class g_disk_class = { 6097075Sphk "DISK", 6192108Sphk NULL, 6292108Sphk NULL, 6398066Sphk G_CLASS_INITIALIZER 6492108Sphk}; 6592108Sphk 6692108Sphkstatic int 6792108Sphkg_disk_access(struct g_provider *pp, int r, int w, int e) 6892108Sphk{ 6992108Sphk struct disk *dp; 7092108Sphk dev_t dev; 7192108Sphk int error; 7292108Sphk 7392108Sphk g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)", 7492108Sphk pp->name, r, w, e); 7592108Sphk g_topology_assert(); 7692108Sphk r += pp->acr; 7792108Sphk w += pp->acw; 7892108Sphk e += pp->ace; 7992108Sphk dp = pp->geom->softc; 8092108Sphk dev = dp->d_dev; 8192108Sphk if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) { 8292108Sphk mtx_lock(&Giant); 8392108Sphk error = devsw(dev)->d_open(dev, 3, 0, NULL); 8492108Sphk if (error != 0) 8592108Sphk printf("Opened disk %s -> %d\n", pp->name, error); 8692108Sphk mtx_unlock(&Giant); 8792108Sphk } else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) { 8892108Sphk mtx_lock(&Giant); 8992108Sphk error = devsw(dev)->d_close(dev, 3, 0, NULL); 9092108Sphk if (error != 0) 9192108Sphk printf("Closed disk %s -> %d\n", pp->name, error); 9292108Sphk mtx_unlock(&Giant); 9392108Sphk } else { 9492108Sphk error = 0; 9592108Sphk } 96103714Sphk pp->mediasize = dp->d_mediasize; 9792108Sphk return (error); 9892108Sphk} 9992108Sphk 10092108Sphkstatic void 10195038Sphkg_disk_kerneldump(struct bio *bp, struct disk *dp) 10295038Sphk{ 10395038Sphk int error; 10495038Sphk struct g_kerneldump *gkd; 10595038Sphk struct dumperinfo di; 106104450Sphk struct g_geom *gp; 10795038Sphk 10895038Sphk gkd = (struct g_kerneldump*)bp->bio_data; 109104450Sphk gp = bp->bio_to->geom; 110104450Sphk g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)", 111104450Sphk gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length); 11295038Sphk di.dumper = (dumper_t *)dp->d_devsw->d_dump; 11395038Sphk di.priv = dp->d_dev; 114103714Sphk di.blocksize = dp->d_sectorsize; 11595038Sphk di.mediaoffset = gkd->offset; 11695038Sphk di.mediasize = gkd->length; 11795038Sphk error = set_dumper(&di); 118104195Sphk g_io_deliver(bp, error); 11995038Sphk} 12095038Sphk 12195038Sphkstatic void 12292108Sphkg_disk_done(struct bio *bp) 12392108Sphk{ 12492108Sphk 12592108Sphk mtx_unlock(&Giant); 12692108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 12792108Sphk g_std_done(bp); 12892108Sphk mtx_lock(&Giant); 12992108Sphk} 13092108Sphk 13192108Sphkstatic void 132104312Sphkg_disk_ioctl(void *arg) 133104312Sphk{ 134104312Sphk struct bio *bp; 135104312Sphk dev_t dev; 136104312Sphk struct disk *dp; 137104312Sphk struct g_ioctl *gio; 138104312Sphk int error; 139104312Sphk 140104312Sphk bp = arg; 141104312Sphk dp = bp->bio_to->geom->softc; 142104312Sphk dev = dp->d_dev; 143104312Sphk gio = (struct g_ioctl *)bp->bio_data; 144104312Sphk mtx_lock(&Giant); 145104312Sphk error = devsw(dev)->d_ioctl(dev, gio->cmd, 146104312Sphk gio->data, gio->fflag, gio->td); 147104312Sphk mtx_unlock(&Giant); 148104312Sphk g_io_deliver(bp, error); 149104312Sphk} 150104312Sphk 151104312Sphkstatic void 15292108Sphkg_disk_start(struct bio *bp) 15392108Sphk{ 15492108Sphk struct bio *bp2; 15592108Sphk dev_t dev; 15692108Sphk struct disk *dp; 15792403Sphk struct g_ioctl *gio; 15892403Sphk int error; 15992108Sphk 16092108Sphk dp = bp->bio_to->geom->softc; 16192108Sphk dev = dp->d_dev; 16292403Sphk error = 0; 16392108Sphk switch(bp->bio_cmd) { 16492108Sphk case BIO_READ: 16592108Sphk case BIO_WRITE: 16692108Sphk bp2 = g_clone_bio(bp); 16792108Sphk bp2->bio_done = g_disk_done; 16892108Sphk bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 16992108Sphk bp2->bio_pblkno = bp2->bio_blkno; 17092108Sphk bp2->bio_bcount = bp2->bio_length; 17192108Sphk bp2->bio_dev = dev; 17292108Sphk mtx_lock(&Giant); 17392108Sphk devsw(dev)->d_strategy(bp2); 17492108Sphk mtx_unlock(&Giant); 17592108Sphk break; 17692108Sphk case BIO_GETATTR: 177103714Sphk if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 17892403Sphk break; 179103714Sphk else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 18092403Sphk break; 181103714Sphk else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 18292403Sphk break; 183103714Sphk else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 18492403Sphk break; 18598066Sphk else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 18694287Sphk break; 18795038Sphk else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 18895038Sphk g_disk_kerneldump(bp, dp); 18992403Sphk else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 19092403Sphk bp->bio_length == sizeof *gio) { 191104312Sphk g_call_me(g_disk_ioctl, bp); 192104312Sphk return; 19392403Sphk } else 19492403Sphk error = ENOIOCTL; 19592403Sphk break; 19692108Sphk default: 19792403Sphk error = EOPNOTSUPP; 19892403Sphk break; 19992403Sphk } 20092403Sphk if (error) { 201104195Sphk g_io_deliver(bp, error); 20292108Sphk } 20392403Sphk return; 20492108Sphk} 20592108Sphk 20692108Sphkdev_t 20792108Sphkdisk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 20892108Sphk{ 20992108Sphk static int once; 21092108Sphk struct g_geom *gp; 21192108Sphk struct g_provider *pp; 21292108Sphk dev_t dev; 21392108Sphk 21492108Sphk mtx_unlock(&Giant); 21592108Sphk if (!once) { 21693248Sphk g_add_class(&g_disk_class); 21792108Sphk once++; 21892108Sphk } 21992108Sphk dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 22092108Sphk dp->d_dev = dev; 22193642Sphk dp->d_devsw = cdevsw; 22292108Sphk dev->si_devsw = cdevsw; 22392108Sphk dev->si_disk = dp; 22492108Sphk dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 22592108Sphk g_topology_lock(); 22693248Sphk gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 22797317Sphk strcpy(dev->si_name, gp->name); 22892108Sphk gp->start = g_disk_start; 22993776Sphk gp->access = g_disk_access; 23092108Sphk gp->softc = dp; 23192108Sphk dp->d_softc = gp; 23292108Sphk pp = g_new_providerf(gp, "%s", gp->name); 23392108Sphk g_error_provider(pp, 0); 23492108Sphk g_topology_unlock(); 23592108Sphk mtx_lock(&Giant); 23692108Sphk return (dev); 23792108Sphk} 23892108Sphk 23992108Sphkvoid disk_dev_synth(dev_t dev); 24092108Sphk 24192108Sphkvoid 24292108Sphkdisk_dev_synth(dev_t dev) 24392108Sphk{ 24492108Sphk 24592108Sphk return; 24692108Sphk} 24792108Sphk 24892108Sphkvoid 24992108Sphkdisk_destroy(dev_t dev) 25092108Sphk{ 25192108Sphk struct disk *dp; 25292108Sphk struct g_geom *gp; 25392108Sphk 25492108Sphk dp = dev->si_disk; 25592108Sphk gp = dp->d_softc; 25692108Sphk g_free(dev); 25792108Sphk gp->flags |= G_GEOM_WITHER; 25892108Sphk g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 25992108Sphk} 26092108Sphk 26192108Sphkvoid 26292108Sphkdisk_invalidate (struct disk *disk) 26392108Sphk{ 26492108Sphk} 26592108Sphk 26692108SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD, 26792108Sphk 0, sizeof(struct disklabel), "sizeof(struct disklabel)"); 26892108Sphk 26992108SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 27092108Sphk 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 27192108Sphk 27292108SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 27392108Sphk 0, sizeof(struct disk), "sizeof(struct disk)"); 274104451Sphk 275104451Sphkstatic void 276104451Sphkg_kern_disks(void *p) 277104451Sphk{ 278104451Sphk struct sbuf *sb; 279104451Sphk struct g_geom *gp; 280104451Sphk char *sp; 281104451Sphk 282104451Sphk sb = p; 283104451Sphk sp = ""; 284104451Sphk g_topology_assert(); 285104451Sphk LIST_FOREACH(gp, &g_disk_class.geom, geom) { 286104451Sphk sbuf_printf(sb, "%s%s", sp, gp->name); 287104451Sphk sp = " "; 288104451Sphk } 289104451Sphk sbuf_finish(sb); 290104451Sphk wakeup(sb); 291104451Sphk} 292104451Sphk 293104451Sphkstatic int 294104451Sphksysctl_disks(SYSCTL_HANDLER_ARGS) 295104451Sphk{ 296104451Sphk int error; 297104451Sphk struct sbuf *sb; 298104451Sphk 299104451Sphk sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND); 300104451Sphk sbuf_clear(sb); 301104451Sphk g_call_me(g_kern_disks, sb); 302104451Sphk do { 303104451Sphk tsleep(sb, PZERO, "kern.disks", hz); 304104451Sphk } while(!sbuf_done(sb)); 305104451Sphk error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb)); 306104451Sphk sbuf_delete(sb); 307104451Sphk return error; 308104451Sphk} 309104451Sphk 310104451SphkSYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0, 311104451Sphk sysctl_disks, "A", "names of available disks"); 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