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freebsd/sys/geom/geom_disk.c
Poul-Henning Kamp 497c334767 Simplify the ioctl handling in GEOM. 
This replaces the current ioctl processing with a direct call path
from geom_dev() where the ioctl arrives (from SPECFS) to any directly
connected GEOM class.

The inverse of the above is no longer supported.  This is the
situation were you have one or more intervening GEOM classes, for
instance a BSDlabel on top of a MBR or PC98.  If you want to issue
MBR or PC98 specific ioctls, you will need to issue them on a MBR
or PC98 providers.

This paves the way for inviting CD's, FD's and other special cases
inside GEOM.
2003-09-01 20:45:32 +00:00

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/*-
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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/fcntl.h>
#include <sys/malloc.h>
#include <sys/sysctl.h>
#include <sys/devicestat.h>
#include <machine/md_var.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <geom/geom.h>
#include <geom/geom_disk.h>
#include <geom/geom_int.h>
static struct mtx g_disk_done_mtx;
static g_access_t g_disk_access;
static g_init_t g_disk_init;
static g_fini_t g_disk_fini;
struct g_class g_disk_class = {
.name = "DISK",
.init = g_disk_init,
.fini = g_disk_fini,
};
static void
g_disk_init(struct g_class *mp __unused)
{
mtx_init(&g_disk_done_mtx, "g_disk_done", MTX_DEF, 0);
}
static void
g_disk_fini(struct g_class *mp __unused)
{
mtx_destroy(&g_disk_done_mtx);
}
DECLARE_GEOM_CLASS(g_disk_class, g_disk);
static void __inline
g_disk_lock_giant(struct disk *dp)
{
if (dp->d_flags & DISKFLAG_NOGIANT)
return;
mtx_lock(&Giant);
}
static void __inline
g_disk_unlock_giant(struct disk *dp)
{
if (dp->d_flags & DISKFLAG_NOGIANT)
return;
mtx_unlock(&Giant);
}
static int
g_disk_access(struct g_provider *pp, int r, int w, int e)
{
struct disk *dp;
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;
if (dp == NULL)
return (ENXIO);
error = 0;
if ((pp->acr + pp->acw + pp->ace) == 0 && (r + w + e) > 0) {
if (dp->d_open != NULL) {
g_disk_lock_giant(dp);
error = dp->d_open(dp);
if (error != 0)
printf("Opened disk %s -> %d\n",
pp->name, error);
g_disk_unlock_giant(dp);
}
pp->mediasize = dp->d_mediasize;
pp->sectorsize = dp->d_sectorsize;
dp->d_flags |= DISKFLAG_OPEN;
if (dp->d_maxsize == 0) {
printf("WARNING: Disk drive %s%d has no d_maxsize\n",
dp->d_name, dp->d_unit);
dp->d_maxsize = DFLTPHYS;
}
} else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
if (dp->d_close != NULL) {
g_disk_lock_giant(dp);
error = dp->d_close(dp);
if (error != 0)
printf("Closed disk %s -> %d\n",
pp->name, error);
g_disk_unlock_giant(dp);
}
dp->d_flags &= ~DISKFLAG_OPEN;
}
return (error);
}
static void
g_disk_kerneldump(struct bio *bp, struct disk *dp)
{
int error;
struct g_kerneldump *gkd;
struct dumperinfo di;
struct g_geom *gp;
gkd = (struct g_kerneldump*)bp->bio_data;
gp = bp->bio_to->geom;
g_trace(G_T_TOPOLOGY, "g_disk_kernedump(%s, %jd, %jd)",
gp->name, (intmax_t)gkd->offset, (intmax_t)gkd->length);
di.dumper = dp->d_dump;
di.priv = dp;
di.blocksize = dp->d_sectorsize;
di.mediaoffset = gkd->offset;
di.mediasize = gkd->length;
error = set_dumper(&di);
g_io_deliver(bp, error);
}
static void
g_disk_done(struct bio *bp)
{
struct bio *bp2;
struct disk *dp;
/* See "notes" for why we need a mutex here */
/* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
mtx_lock(&g_disk_done_mtx);
bp->bio_completed = bp->bio_length - bp->bio_resid;
bp2 = bp->bio_parent;
dp = bp2->bio_to->geom->softc;
if (bp2->bio_error == 0)
bp2->bio_error = bp->bio_error;
bp2->bio_completed += bp->bio_completed;
g_destroy_bio(bp);
bp2->bio_inbed++;
if (bp2->bio_children == bp2->bio_inbed) {
bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
devstat_end_transaction_bio(dp->d_devstat, bp2);
g_io_deliver(bp2, bp2->bio_error);
}
mtx_unlock(&g_disk_done_mtx);
}
static int
g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, struct thread *td)
{
struct g_geom *gp;
struct disk *dp;
int error;
gp = pp->geom;
dp = gp->softc;
if (dp->d_ioctl == NULL)
return (ENOIOCTL);
g_disk_lock_giant(dp);
error = dp->d_ioctl(dp, cmd, data, 0, td);
g_disk_unlock_giant(dp);
return(error);
}
static void
g_disk_start(struct bio *bp)
{
struct bio *bp2, *bp3;
struct disk *dp;
int error;
off_t off;
dp = bp->bio_to->geom->softc;
if (dp == NULL)
g_io_deliver(bp, ENXIO);
error = EJUSTRETURN;
switch(bp->bio_cmd) {
case BIO_DELETE:
if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
error = 0;
break;
}
/* fall-through */
case BIO_READ:
case BIO_WRITE:
off = 0;
bp3 = NULL;
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
error = ENOMEM;
break;
}
devstat_start_transaction_bio(dp->d_devstat, bp);
do {
bp2->bio_offset += off;
bp2->bio_length -= off;
bp2->bio_data += off;
if (bp2->bio_length > dp->d_maxsize) {
/*
* XXX: If we have a stripesize we should really
* use it here.
*/
bp2->bio_length = dp->d_maxsize;
off += dp->d_maxsize;
/*
* To avoid a race, we need to grab the next bio
* before we schedule this one. See "notes".
*/
bp3 = g_clone_bio(bp);
if (bp3 == NULL)
bp->bio_error = ENOMEM;
}
bp2->bio_done = g_disk_done;
bp2->bio_blkno = bp2->bio_offset >> DEV_BSHIFT;
bp2->bio_pblkno = bp2->bio_offset / dp->d_sectorsize;
bp2->bio_bcount = bp2->bio_length;
bp2->bio_disk = dp;
g_disk_lock_giant(dp);
dp->d_strategy(bp2);
g_disk_unlock_giant(dp);
bp2 = bp3;
bp3 = NULL;
} while (bp2 != NULL);
break;
case BIO_GETATTR:
if (g_handleattr_int(bp, "GEOM::fwsectors", dp->d_fwsectors))
break;
else if (g_handleattr_int(bp, "GEOM::fwheads", dp->d_fwheads))
break;
else if (g_handleattr_off_t(bp, "GEOM::frontstuff", 0))
break;
else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
g_disk_kerneldump(bp, dp);
else
error = ENOIOCTL;
break;
default:
error = EOPNOTSUPP;
break;
}
if (error != EJUSTRETURN)
g_io_deliver(bp, error);
return;
}
static void
g_disk_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp)
{
struct disk *dp;
dp = gp->softc;
if (indent == NULL) {
sbuf_printf(sb, " hd %u", dp->d_fwheads);
sbuf_printf(sb, " sc %u", dp->d_fwsectors);
return;
}
if (pp != NULL) {
sbuf_printf(sb, "%s<fwheads>%u</fwheads>\n",
indent, dp->d_fwheads);
sbuf_printf(sb, "%s<fwsectors>%u</fwsectors>\n",
indent, dp->d_fwsectors);
}
}
static void
g_disk_create(void *arg, int flag)
{
struct g_geom *gp;
struct g_provider *pp;
struct disk *dp;
if (flag == EV_CANCEL)
return;
g_topology_assert();
dp = arg;
gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
gp->start = g_disk_start;
gp->access = g_disk_access;
gp->ioctl = g_disk_ioctl;
gp->softc = dp;
gp->dumpconf = g_disk_dumpconf;
pp = g_new_providerf(gp, "%s", gp->name);
pp->mediasize = dp->d_mediasize;
pp->sectorsize = dp->d_sectorsize;
if (dp->d_flags & DISKFLAG_CANDELETE)
pp->flags |= G_PF_CANDELETE;
pp->stripeoffset = dp->d_stripeoffset;
pp->stripesize = dp->d_stripesize;
if (bootverbose)
printf("GEOM: new disk %s\n", gp->name);
dp->d_geom = gp;
g_error_provider(pp, 0);
}
static void
g_disk_destroy(void *ptr, int flag)
{
struct g_geom *gp;
g_topology_assert();
gp = ptr;
gp->softc = NULL;
g_wither_geom(gp, ENXIO);
}
void
disk_create(int unit, struct disk *dp, int flags, void *unused __unused, void * unused2 __unused)
{
dp->d_unit = unit;
dp->d_flags = flags;
KASSERT(dp->d_strategy != NULL, ("disk_create need d_strategy"));
KASSERT(dp->d_name != NULL, ("disk_create need d_name"));
KASSERT(*dp->d_name != 0, ("disk_create need d_name"));
KASSERT(strlen(dp->d_name) < SPECNAMELEN - 4, ("disk name too long"));
if (bootverbose || 1)
printf("GEOM: create disk %s%d dp=%p\n",
dp->d_name, dp->d_unit, dp);
dp->d_devstat = devstat_new_entry(dp->d_name, dp->d_unit,
dp->d_sectorsize, DEVSTAT_ALL_SUPPORTED,
DEVSTAT_TYPE_DIRECT, DEVSTAT_PRIORITY_MAX);
dp->d_geom = NULL;
g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
}
void
disk_destroy(struct disk *dp)
{
struct g_geom *gp;
if (bootverbose || 1)
printf("GEOM: destroy disk %s%d dp=%p\n",
dp->d_name, dp->d_unit, dp);
g_cancel_event(dp);
gp = dp->d_geom;
if (gp == NULL)
return;
gp->softc = NULL;
devstat_remove_entry(dp->d_devstat);
g_waitfor_event(g_disk_destroy, gp, M_WAITOK, NULL, NULL);
dp->d_geom = NULL;
}
static void
g_kern_disks(void *p, int flag __unused)
{
struct sbuf *sb;
struct g_geom *gp;
char *sp;
sb = p;
sp = "";
g_topology_assert();
LIST_FOREACH(gp, &g_disk_class.geom, geom) {
sbuf_printf(sb, "%s%s", sp, gp->name);
sp = " ";
}
sbuf_finish(sb);
}
static int
sysctl_disks(SYSCTL_HANDLER_ARGS)
{
int error;
struct sbuf *sb;
sb = sbuf_new(NULL, NULL, 0, SBUF_AUTOEXTEND);
sbuf_clear(sb);
g_waitfor_event(g_kern_disks, sb, M_WAITOK, NULL);
error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
sbuf_delete(sb);
return error;
}
SYSCTL_PROC(_kern, OID_AUTO, disks, CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NOLOCK, 0, 0,
sysctl_disks, "A", "names of available disks");
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