d/freebsd-skq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
c23cda8580
freebsd-skq/sys/geom/geom_disk.c
Poul-Henning Kamp 81661c94b6 Here follows the new kernel dumping infrastructure. 
Caveats:

The new savecore program is not complete in the sense that it emulates
enough of the old savecores features to do the job, but implements none
of the options yet.

I would appreciate if a userland hacker could help me out getting savecore
to do what we want it to do from a users point of view, compression,
email-notification, space reservation etc etc.  (send me email if
you are interested).

Currently, savecore will scan all devices marked as "swap" or "dump" in
/etc/fstab _or_ any devices specified on the command-line.

All architectures but i386 lack an implementation of dumpsys(), but
looking at the i386 version it should be trivial for anybody familiar
with the platform(s) to provide this function.

Documentation is quite sparse at this time, more to come.

Details:

ATA and SCSI drivers should work as the dump formatting code has been
removed.  The IDA, TWE and AAC have not yet been converted.

Dumpon now opens the device and uses ioctl(DIOCGKERNELDUMP) to set
the device as dumpdev.  To implement the "off" argument, /dev/null
is used as the device.

Savecore will fail if handed any options since they are not (yet)
implemented.  All devices marked "dump" or "swap" in /etc/fstab
will be scanned and dumps found will be saved to diskfiles
named from the MD5 hash of the header record.  The header record
is dumped in readable format in the .info file.  The kernel
is not saved.  Only complete dumps will be saved.

All maintainer rights for this code are disclaimed: feel free to
improve and extend.

Sponsored by:   DARPA, NAI Labs
2002-03-31 22:37:00 +00:00

240 lines
6.0 KiB
C
Raw Blame History

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