geom_disk.c revision 104312
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 104312 2002-10-01 18:42:32Z 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; 10695038Sphk 10795038Sphk gkd = (struct g_kerneldump*)bp->bio_data; 108103284Sphk printf("Kerneldump off=%jd len=%jd\n", (intmax_t)gkd->offset, (intmax_t)gkd->length); 10995038Sphk di.dumper = (dumper_t *)dp->d_devsw->d_dump; 11095038Sphk di.priv = dp->d_dev; 111103714Sphk di.blocksize = dp->d_sectorsize; 11295038Sphk di.mediaoffset = gkd->offset; 11395038Sphk di.mediasize = gkd->length; 11495038Sphk error = set_dumper(&di); 115104195Sphk g_io_deliver(bp, error); 11695038Sphk} 11795038Sphk 11895038Sphkstatic void 11992108Sphkg_disk_done(struct bio *bp) 12092108Sphk{ 12192108Sphk 12292108Sphk mtx_unlock(&Giant); 12392108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 12492108Sphk g_std_done(bp); 12592108Sphk mtx_lock(&Giant); 12692108Sphk} 12792108Sphk 12892108Sphkstatic void 129104312Sphkg_disk_ioctl(void *arg) 130104312Sphk{ 131104312Sphk struct bio *bp; 132104312Sphk dev_t dev; 133104312Sphk struct disk *dp; 134104312Sphk struct g_ioctl *gio; 135104312Sphk int error; 136104312Sphk 137104312Sphk bp = arg; 138104312Sphk dp = bp->bio_to->geom->softc; 139104312Sphk dev = dp->d_dev; 140104312Sphk gio = (struct g_ioctl *)bp->bio_data; 141104312Sphk mtx_lock(&Giant); 142104312Sphk error = devsw(dev)->d_ioctl(dev, gio->cmd, 143104312Sphk gio->data, gio->fflag, gio->td); 144104312Sphk mtx_unlock(&Giant); 145104312Sphk g_io_deliver(bp, error); 146104312Sphk} 147104312Sphk 148104312Sphkstatic void 14992108Sphkg_disk_start(struct bio *bp) 15092108Sphk{ 15192108Sphk struct bio *bp2; 15292108Sphk dev_t dev; 15392108Sphk struct disk *dp; 15492403Sphk struct g_ioctl *gio; 15592403Sphk int error; 15692108Sphk 15792108Sphk dp = bp->bio_to->geom->softc; 15892108Sphk dev = dp->d_dev; 15992403Sphk error = 0; 16092108Sphk switch(bp->bio_cmd) { 16192108Sphk case BIO_READ: 16292108Sphk case BIO_WRITE: 16392108Sphk bp2 = g_clone_bio(bp); 16492108Sphk bp2->bio_done = g_disk_done; 16592108Sphk bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 16692108Sphk bp2->bio_pblkno = bp2->bio_blkno; 16792108Sphk bp2->bio_bcount = bp2->bio_length; 16892108Sphk bp2->bio_dev = dev; 16992108Sphk mtx_lock(&Giant); 17092108Sphk devsw(dev)->d_strategy(bp2); 17192108Sphk mtx_unlock(&Giant); 17292108Sphk break; 17392108Sphk case BIO_GETATTR: 174103714Sphk if (g_handleattr_int(bp, "GEOM::sectorsize", dp->d_sectorsize)) 17592403Sphk break; 176103714Sphk else if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors)) 17792403Sphk break; 178103714Sphk else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads)) 17992403Sphk break; 180103714Sphk else if (g_handleattr_off_t(bp, "GEOM::mediasize", dp->d_mediasize)) 18192403Sphk break; 18298066Sphk else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0)) 18394287Sphk break; 18495038Sphk else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump")) 18595038Sphk g_disk_kerneldump(bp, dp); 18692403Sphk else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 18792403Sphk bp->bio_length == sizeof *gio) { 188104312Sphk g_call_me(g_disk_ioctl, bp); 189104312Sphk return; 19092403Sphk } else 19192403Sphk error = ENOIOCTL; 19292403Sphk break; 19392108Sphk default: 19492403Sphk error = EOPNOTSUPP; 19592403Sphk break; 19692403Sphk } 19792403Sphk if (error) { 198104195Sphk g_io_deliver(bp, error); 19992108Sphk } 20092403Sphk return; 20192108Sphk} 20292108Sphk 20392108Sphkdev_t 20492108Sphkdisk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 20592108Sphk{ 20692108Sphk static int once; 20792108Sphk struct g_geom *gp; 20892108Sphk struct g_provider *pp; 20992108Sphk dev_t dev; 21092108Sphk 21192108Sphk mtx_unlock(&Giant); 21292108Sphk if (!once) { 21393248Sphk g_add_class(&g_disk_class); 21492108Sphk once++; 21592108Sphk } 21692108Sphk dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 21792108Sphk dp->d_dev = dev; 21893642Sphk dp->d_devsw = cdevsw; 21992108Sphk dev->si_devsw = cdevsw; 22092108Sphk dev->si_disk = dp; 22192108Sphk dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 22292108Sphk g_topology_lock(); 22393248Sphk gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 22497317Sphk strcpy(dev->si_name, gp->name); 22592108Sphk gp->start = g_disk_start; 22693776Sphk gp->access = g_disk_access; 22792108Sphk gp->softc = dp; 22892108Sphk dp->d_softc = gp; 22992108Sphk pp = g_new_providerf(gp, "%s", gp->name); 23092108Sphk g_error_provider(pp, 0); 23192108Sphk g_topology_unlock(); 23292108Sphk mtx_lock(&Giant); 23392108Sphk return (dev); 23492108Sphk} 23592108Sphk 23692108Sphkvoid disk_dev_synth(dev_t dev); 23792108Sphk 23892108Sphkvoid 23992108Sphkdisk_dev_synth(dev_t dev) 24092108Sphk{ 24192108Sphk 24292108Sphk return; 24392108Sphk} 24492108Sphk 24592108Sphkvoid 24692108Sphkdisk_destroy(dev_t dev) 24792108Sphk{ 24892108Sphk struct disk *dp; 24992108Sphk struct g_geom *gp; 25092108Sphk 25192108Sphk dp = dev->si_disk; 25292108Sphk gp = dp->d_softc; 25392108Sphk g_free(dev); 25492108Sphk gp->flags |= G_GEOM_WITHER; 25592108Sphk g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 25692108Sphk} 25792108Sphk 25892108Sphkvoid 25992108Sphkdisk_invalidate (struct disk *disk) 26092108Sphk{ 26192108Sphk} 26292108Sphk 26392108Sphk 26492108SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD, 26592108Sphk 0, sizeof(struct disklabel), "sizeof(struct disklabel)"); 26692108Sphk 26792108SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 26892108Sphk 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 26992108Sphk 27092108SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 27192108Sphk 0, sizeof(struct disk), "sizeof(struct disk)"); 272