240 lines
6.1 KiB
C
240 lines
6.1 KiB
C
/*-
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* Copyright (c) 2002 Poul-Henning Kamp
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* Copyright (c) 2002 Networks Associates Technology, Inc.
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include "opt_geom.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/bio.h>
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#include <sys/conf.h>
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#include <sys/disk.h>
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#include <sys/malloc.h>
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#include <sys/sysctl.h>
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#include <machine/md_var.h>
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#include <sys/ctype.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <geom/geom.h>
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static g_access_t g_disk_access;
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struct g_class g_disk_class = {
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"DISK-class",
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NULL,
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NULL,
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G_CLASS_INITSTUFF
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};
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static int
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g_disk_access(struct g_provider *pp, int r, int w, int e)
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{
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struct disk *dp;
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dev_t dev;
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int error;
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g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
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pp->name, r, w, e);
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g_topology_assert();
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r += pp->acr;
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w += pp->acw;
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e += pp->ace;
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dp = pp->geom->softc;
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dev = dp->d_dev;
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if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
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mtx_lock(&Giant);
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error = devsw(dev)->d_open(dev, 3, 0, NULL);
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if (error != 0)
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printf("Opened disk %s -> %d\n", pp->name, error);
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mtx_unlock(&Giant);
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} else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
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mtx_lock(&Giant);
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error = devsw(dev)->d_close(dev, 3, 0, NULL);
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if (error != 0)
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printf("Closed disk %s -> %d\n", pp->name, error);
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mtx_unlock(&Giant);
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} else {
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error = 0;
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}
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pp->mediasize =
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dp->d_label.d_secsize * (off_t)dp->d_label.d_secperunit;
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return (error);
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}
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static void
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g_disk_done(struct bio *bp)
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{
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mtx_unlock(&Giant);
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bp->bio_completed = bp->bio_length - bp->bio_resid;
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g_std_done(bp);
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mtx_lock(&Giant);
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}
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static void
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g_disk_start(struct bio *bp)
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{
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struct bio *bp2;
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dev_t dev;
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struct disk *dp;
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struct g_ioctl *gio;
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int error;
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dp = bp->bio_to->geom->softc;
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dev = dp->d_dev;
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error = 0;
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switch(bp->bio_cmd) {
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case BIO_READ:
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case BIO_WRITE:
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bp2 = g_clone_bio(bp);
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bp2->bio_done = g_disk_done;
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bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT;
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bp2->bio_pblkno = bp2->bio_blkno;
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bp2->bio_bcount = bp2->bio_length;
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bp2->bio_dev = dev;
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mtx_lock(&Giant);
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devsw(dev)->d_strategy(bp2);
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mtx_unlock(&Giant);
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break;
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case BIO_GETATTR:
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if (g_haveattr_int(bp, "GEOM::sectorsize",
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dp->d_label.d_secsize))
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break;
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else if (g_haveattr_int(bp, "GEOM::fwsectors",
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dp->d_label.d_nsectors))
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break;
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else if (g_haveattr_int(bp, "GEOM::fwheads",
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dp->d_label.d_ntracks))
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break;
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else if (g_haveattr_off_t(bp, "GEOM::mediasize",
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dp->d_label.d_secsize * (off_t)dp->d_label.d_secperunit))
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break;
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else if (g_haveattr_off_t(bp, "GEOM::frontstuff", 0))
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break;
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else if (!strcmp(bp->bio_attribute, "GEOM::ioctl") &&
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bp->bio_length == sizeof *gio) {
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gio = (struct g_ioctl *)bp->bio_data;
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mtx_lock(&Giant);
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error = devsw(dev)->d_ioctl(dev, gio->cmd,
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gio->data, gio->fflag, gio->td);
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mtx_unlock(&Giant);
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} else
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error = ENOIOCTL;
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break;
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default:
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error = EOPNOTSUPP;
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break;
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}
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if (error) {
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bp->bio_error = error;
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g_io_deliver(bp);
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}
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return;
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}
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dev_t
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disk_create(int unit, struct disk *dp, int flags, struct cdevsw *cdevsw, struct cdevsw *proto)
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{
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static int once;
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struct g_geom *gp;
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struct g_provider *pp;
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dev_t dev;
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mtx_unlock(&Giant);
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if (!once) {
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g_add_class(&g_disk_class);
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once++;
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}
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dev = g_malloc(sizeof *dev, M_WAITOK | M_ZERO);
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dp->d_dev = dev;
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dp->d_devsw = cdevsw;
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dev->si_devsw = cdevsw;
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dev->si_disk = dp;
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dev->si_udev = dkmakeminor(unit, WHOLE_DISK_SLICE, RAW_PART);
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g_topology_lock();
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gp = g_new_geomf(&g_disk_class, "%s%d", cdevsw->d_name, unit);
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gp->start = g_disk_start;
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gp->access = g_disk_access;
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gp->softc = dp;
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dp->d_softc = gp;
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pp = g_new_providerf(gp, "%s", gp->name);
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g_error_provider(pp, 0);
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g_topology_unlock();
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mtx_lock(&Giant);
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return (dev);
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}
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void disk_dev_synth(dev_t dev);
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void
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disk_dev_synth(dev_t dev)
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{
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return;
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}
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void
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disk_destroy(dev_t dev)
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{
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struct disk *dp;
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struct g_geom *gp;
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dp = dev->si_disk;
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gp = dp->d_softc;
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g_free(dev);
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gp->flags |= G_GEOM_WITHER;
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g_orphan_provider(LIST_FIRST(&gp->provider), ENXIO);
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}
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void
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disk_invalidate (struct disk *disk)
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{
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}
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SYSCTL_INT(_debug_sizeof, OID_AUTO, disklabel, CTLFLAG_RD,
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0, sizeof(struct disklabel), "sizeof(struct disklabel)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, diskslices, CTLFLAG_RD,
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0, sizeof(struct diskslices), "sizeof(struct diskslices)");
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SYSCTL_INT(_debug_sizeof, OID_AUTO, disk, CTLFLAG_RD,
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0, sizeof(struct disk), "sizeof(struct disk)");
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