geom_disk.c revision 93778
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 93778 2002-04-04 09:58:20Z phk $ 3692108Sphk */ 3792108Sphk 3892108Sphk#include "opt_geom.h" 3992108Sphk 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> 4792108Sphk#include <sys/malloc.h> 4892108Sphk#include <sys/sysctl.h> 4992108Sphk#include <machine/md_var.h> 5092108Sphk#include <sys/ctype.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 = { 6093248Sphk "DISK-class", 6192108Sphk NULL, 6292108Sphk NULL, 6393776Sphk G_CLASS_INITSTUFF 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 } 9693778Sphk pp->mediasize = 9793778Sphk dp->d_label.d_secsize * (off_t)dp->d_label.d_secperunit; 9892108Sphk return (error); 9992108Sphk} 10092108Sphk 10192108Sphkstatic void 10292108Sphkg_disk_done(struct bio *bp) 10392108Sphk{ 10492108Sphk 10592108Sphk mtx_unlock(&Giant); 10692108Sphk bp->bio_completed = bp->bio_length - bp->bio_resid; 10792108Sphk g_std_done(bp); 10892108Sphk mtx_lock(&Giant); 10992108Sphk} 11092108Sphk 11192108Sphkstatic void 11292108Sphkg_disk_start(struct bio *bp) 11392108Sphk{ 11492108Sphk struct bio *bp2; 11592108Sphk dev_t dev; 11692108Sphk struct disk *dp; 11792403Sphk struct g_ioctl *gio; 11892403Sphk int error; 11992108Sphk 12092108Sphk dp = bp->bio_to->geom->softc; 12192108Sphk dev = dp->d_dev; 12292403Sphk error = 0; 12392108Sphk switch(bp->bio_cmd) { 12492108Sphk case BIO_READ: 12592108Sphk case BIO_WRITE: 12692108Sphk bp2 = g_clone_bio(bp); 12792108Sphk bp2->bio_done = g_disk_done; 12892108Sphk bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT; 12992108Sphk bp2->bio_pblkno = bp2->bio_blkno; 13092108Sphk bp2->bio_bcount = bp2->bio_length; 13192108Sphk bp2->bio_dev = dev; 13292108Sphk mtx_lock(&Giant); 13392108Sphk devsw(dev)->d_strategy(bp2); 13492108Sphk mtx_unlock(&Giant); 13592108Sphk break; 13692108Sphk case BIO_GETATTR: 13792108Sphk if (g_haveattr_int(bp, "GEOM::sectorsize", 13892108Sphk dp->d_label.d_secsize)) 13992403Sphk break; 14092403Sphk else if (g_haveattr_int(bp, "GEOM::fwsectors", 14192108Sphk dp->d_label.d_nsectors)) 14292403Sphk break; 14392403Sphk else if (g_haveattr_int(bp, "GEOM::fwheads", 14492108Sphk dp->d_label.d_ntracks)) 14592403Sphk break; 14692403Sphk else if (g_haveattr_int(bp, "GEOM::fwcylinders", 14792108Sphk dp->d_label.d_ncylinders)) 14892403Sphk break; 14992403Sphk else if (g_haveattr_off_t(bp, "GEOM::mediasize", 15092108Sphk dp->d_label.d_secsize * (off_t)dp->d_label.d_secperunit)) 15192403Sphk break; 15292403Sphk else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") && 15392403Sphk bp->bio_length == sizeof *gio) { 15492403Sphk gio = (struct g_ioctl *)bp->bio_data; 15592403Sphk mtx_lock(&Giant); 15692403Sphk error = devsw(dev)->d_ioctl(dev, gio->cmd, 15792403Sphk gio->data, gio->fflag, gio->td); 15892403Sphk mtx_unlock(&Giant); 15992403Sphk } else 16092403Sphk error = ENOIOCTL; 16192403Sphk break; 16292108Sphk default: 16392403Sphk error = EOPNOTSUPP; 16492403Sphk break; 16592403Sphk } 16692403Sphk if (error) { 16792403Sphk bp->bio_error = error; 16892108Sphk g_io_deliver(bp); 16992108Sphk } 17092403Sphk return; 17192108Sphk} 17292108Sphk 17392108Sphkdev_t 17492108Sphkdisk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto) 17592108Sphk{ 17692108Sphk static int once; 17792108Sphk struct g_geom *gp; 17892108Sphk struct g_provider *pp; 17992108Sphk dev_t dev; 18092108Sphk 18192108Sphk mtx_unlock(&Giant); 18292108Sphk if (!once) { 18393248Sphk g_add_class(&g_disk_class); 18492108Sphk once++; 18592108Sphk } 18692108Sphk dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO); 18792108Sphk dp->d_dev = dev; 18893642Sphk dp->d_devsw = cdevsw; 18992108Sphk dev->si_devsw = cdevsw; 19092108Sphk dev->si_disk = dp; 19192108Sphk dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART); 19292108Sphk g_topology_lock(); 19393248Sphk gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit); 19492108Sphk gp->start = g_disk_start; 19593776Sphk gp->access = g_disk_access; 19692108Sphk gp->softc = dp; 19792108Sphk dp->d_softc = gp; 19892108Sphk pp = g_new_providerf(gp, "%s", gp->name); 19992108Sphk g_error_provider(pp, 0); 20092108Sphk g_topology_unlock(); 20192108Sphk mtx_lock(&Giant); 20292108Sphk return (dev); 20392108Sphk} 20492108Sphk 20592108Sphkvoid disk_dev_synth(dev_t dev); 20692108Sphk 20792108Sphkvoid 20892108Sphkdisk_dev_synth(dev_t dev) 20992108Sphk{ 21092108Sphk 21192108Sphk return; 21292108Sphk} 21392108Sphk 21492108Sphkvoid 21592108Sphkdisk_destroy(dev_t dev) 21692108Sphk{ 21792108Sphk struct disk *dp; 21892108Sphk struct g_geom *gp; 21992108Sphk 22092108Sphk dp = dev->si_disk; 22192108Sphk gp = dp->d_softc; 22292108Sphk g_free(dev); 22392108Sphk gp->flags |= G_GEOM_WITHER; 22492108Sphk g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO); 22592108Sphk} 22692108Sphk 22792108Sphkvoid 22892108Sphkdisk_invalidate (struct disk *disk) 22992108Sphk{ 23092108Sphk} 23192108Sphk 23292108Sphk 23392108SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD, 23492108Sphk 0, sizeof(struct disklabel), "sizeof(struct disklabel)"); 23592108Sphk 23692108SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD, 23792108Sphk 0, sizeof(struct diskslices), "sizeof(struct diskslices)"); 23892108Sphk 23992108SphkSYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD, 24092108Sphk 0, sizeof(struct disk), "sizeof(struct disk)"); 241