/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/ctype.h>
#include <sys/bio.h>
#include <sys/devctl.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/disk.h>
#include <sys/fcntl.h>
#include <sys/limits.h>
#include <sys/sysctl.h>
#include <geom/geom.h>
#include <geom/geom_int.h>
#include <machine/stdarg.h>
struct g_dev_softc {
struct mtx sc_mtx;
struct cdev *sc_dev;
struct cdev *sc_alias;
int sc_open;
u_int sc_active;
#define SC_A_DESTROY (1 << 31)
#define SC_A_OPEN (1 << 30)
#define SC_A_ACTIVE (SC_A_OPEN - 1)
};
static d_open_t g_dev_open;
static d_close_t g_dev_close;
static d_strategy_t g_dev_strategy;
static d_ioctl_t g_dev_ioctl;
static struct cdevsw g_dev_cdevsw = {
.d_version = D_VERSION,
.d_open = g_dev_open,
.d_close = g_dev_close,
.d_read = physread,
.d_write = physwrite,
.d_ioctl = g_dev_ioctl,
.d_strategy = g_dev_strategy,
.d_name = "g_dev",
.d_flags = D_DISK | D_TRACKCLOSE,
};
static g_init_t g_dev_init;
static g_fini_t g_dev_fini;
static g_taste_t g_dev_taste;
static g_orphan_t g_dev_orphan;
static g_attrchanged_t g_dev_attrchanged;
static g_resize_t g_dev_resize;
static struct g_class g_dev_class = {
.name = "DEV",
.version = G_VERSION,
.init = g_dev_init,
.fini = g_dev_fini,
.taste = g_dev_taste,
.orphan = g_dev_orphan,
.attrchanged = g_dev_attrchanged,
.resize = g_dev_resize
};
/*
* We target 262144 (8 x 32768) sectors by default as this significantly
* increases the throughput on commonly used SSD's with a marginal
* increase in non-interruptible request latency.
*/
static uint64_t g_dev_del_max_sectors = 262144;
SYSCTL_DECL(_kern_geom);
SYSCTL_NODE(_kern_geom, OID_AUTO, dev, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
"GEOM_DEV stuff");
SYSCTL_QUAD(_kern_geom_dev, OID_AUTO, delete_max_sectors, CTLFLAG_RW,
&g_dev_del_max_sectors, 0, "Maximum number of sectors in a single "
"delete request sent to the provider. Larger requests are chunked "
"so they can be interrupted. (0 = disable chunking)");
static char *dumpdev = NULL;
static void
g_dev_init(struct g_class *mp)
{
dumpdev = kern_getenv("dumpdev");
}
static void
g_dev_fini(struct g_class *mp)
{
freeenv(dumpdev);
dumpdev = NULL;
}
static int
g_dev_setdumpdev(struct cdev *dev, struct diocskerneldump_arg *kda)
{
struct g_kerneldump kd;
struct g_consumer *cp;
int error, len;
MPASS(dev != NULL && kda != NULL);
MPASS(kda->kda_index != KDA_REMOVE);
cp = dev->si_drv2;
len = sizeof(kd);
memset(&kd, 0, len);
kd.offset = 0;
kd.length = OFF_MAX;
error = g_io_getattr("GEOM::kerneldump", cp, &len, &kd);
if (error != 0)
return (error);
error = dumper_insert(&kd.di, devtoname(dev), kda);
if (error == 0)
dev->si_flags |= SI_DUMPDEV;
return (error);
}
static int
init_dumpdev(struct cdev *dev)
{
struct diocskerneldump_arg kda;
struct g_consumer *cp;
const char *devprefix = _PATH_DEV, *devname;
int error;
size_t len;
bzero(&kda, sizeof(kda));
kda.kda_index = KDA_APPEND;
if (dumpdev == NULL)
return (0);
len = strlen(devprefix);
devname = devtoname(dev);
if (strcmp(devname, dumpdev) != 0 &&
(strncmp(dumpdev, devprefix, len) != 0 ||
strcmp(devname, dumpdev + len) != 0))
return (0);
cp = (struct g_consumer *)dev->si_drv2;
error = g_access(cp, 1, 0, 0);
if (error != 0)
return (error);
error = g_dev_setdumpdev(dev, &kda);
if (error == 0) {
freeenv(dumpdev);
dumpdev = NULL;
}
(void)g_access(cp, -1, 0, 0);
return (error);
}
static void
g_dev_destroy(void *arg, int flags __unused)
{
struct g_consumer *cp;
struct g_geom *gp;
struct g_dev_softc *sc;
char buf[SPECNAMELEN + 6];
g_topology_assert();
cp = arg;
gp = cp->geom;
sc = cp->private;
g_trace(G_T_TOPOLOGY, "g_dev_destroy(%p(%s))", cp, gp->name);
snprintf(buf, sizeof(buf), "cdev=%s", gp->name);
devctl_notify("GEOM", "DEV", "DESTROY", buf);
if (cp->acr > 0 || cp->acw > 0 || cp->ace > 0)
g_access(cp, -cp->acr, -cp->acw, -cp->ace);
g_detach(cp);
g_destroy_consumer(cp);
g_destroy_geom(gp);
mtx_destroy(&sc->sc_mtx);
g_free(sc);
}
void
g_dev_print(void)
{
struct g_geom *gp;
char const *p = "";
LIST_FOREACH(gp, &g_dev_class.geom, geom) {
printf("%s%s", p, gp->name);
p = " ";
}
printf("\n");
}
static void
g_dev_set_physpath(struct g_consumer *cp)
{
struct g_dev_softc *sc;
char *physpath;
int error, physpath_len;
if (g_access(cp, 1, 0, 0) != 0)
return;
sc = cp->private;
physpath_len = MAXPATHLEN;
physpath = g_malloc(physpath_len, M_WAITOK|M_ZERO);
error = g_io_getattr("GEOM::physpath", cp, &physpath_len, physpath);
g_access(cp, -1, 0, 0);
if (error == 0 && strlen(physpath) != 0) {
struct cdev *dev, *old_alias_dev;
struct cdev **alias_devp;
dev = sc->sc_dev;
old_alias_dev = sc->sc_alias;
alias_devp = (struct cdev **)&sc->sc_alias;
make_dev_physpath_alias(MAKEDEV_WAITOK, alias_devp, dev,
old_alias_dev, physpath);
} else if (sc->sc_alias) {
destroy_dev((struct cdev *)sc->sc_alias);
sc->sc_alias = NULL;
}
g_free(physpath);
}
static void
g_dev_set_media(struct g_consumer *cp)
{
struct g_dev_softc *sc;
struct cdev *dev;
char buf[SPECNAMELEN + 6];
sc = cp->private;
dev = sc->sc_dev;
snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
devctl_notify("DEVFS", "CDEV", "MEDIACHANGE", buf);
devctl_notify("GEOM", "DEV", "MEDIACHANGE", buf);
dev = sc->sc_alias;
if (dev != NULL) {
snprintf(buf, sizeof(buf), "cdev=%s", dev->si_name);
devctl_notify("DEVFS", "CDEV", "MEDIACHANGE", buf);
devctl_notify("GEOM", "DEV", "MEDIACHANGE", buf);
}
}
static void
g_dev_attrchanged(struct g_consumer *cp, const char *attr)
{
if (strcmp(attr, "GEOM::media") == 0) {
g_dev_set_media(cp);
return;
}
if (strcmp(attr, "GEOM::physpath") == 0) {
g_dev_set_physpath(cp);
return;
}
}
static void
g_dev_resize(struct g_consumer *cp)
{
char buf[SPECNAMELEN + 6];
snprintf(buf, sizeof(buf), "cdev=%s", cp->provider->name);
devctl_notify("GEOM", "DEV", "SIZECHANGE", buf);
}
struct g_provider *
g_dev_getprovider(struct cdev *dev)
{
struct g_consumer *cp;
g_topology_assert();
if (dev == NULL)
return (NULL);
if (dev->si_devsw != &g_dev_cdevsw)
return (NULL);
cp = dev->si_drv2;
return (cp->provider);
}
static struct g_geom *
g_dev_taste(struct g_class *mp, struct g_provider *pp, int insist __unused)
{
struct g_geom *gp;
struct g_geom_alias *gap;
struct g_consumer *cp;
struct g_dev_softc *sc;
int error;
struct cdev *dev, *adev;
char buf[SPECNAMELEN + 6];
struct make_dev_args args;
g_trace(G_T_TOPOLOGY, "dev_taste(%s,%s)", mp->name, pp->name);
g_topology_assert();
gp = g_new_geomf(mp, "%s", pp->name);
sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
mtx_init(&sc->sc_mtx, "g_dev", NULL, MTX_DEF);
cp = g_new_consumer(gp);
cp->private = sc;
cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
error = g_attach(cp, pp);
if (error != 0) {
printf("%s: g_dev_taste(%s) failed to g_attach, error=%d\n",
__func__, pp->name, error);
g_destroy_consumer(cp);
g_destroy_geom(gp);
mtx_destroy(&sc->sc_mtx);
g_free(sc);
return (NULL);
}
make_dev_args_init(&args);
args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK;
args.mda_devsw = &g_dev_cdevsw;
args.mda_cr = NULL;
args.mda_uid = UID_ROOT;
args.mda_gid = GID_OPERATOR;
args.mda_mode = 0640;
args.mda_si_drv1 = sc;
args.mda_si_drv2 = cp;
error = make_dev_s(&args, &sc->sc_dev, "%s", gp->name);
if (error != 0) {
printf("%s: make_dev_p() failed (gp->name=%s, error=%d)\n",
__func__, gp->name, error);
g_detach(cp);
g_destroy_consumer(cp);
g_destroy_geom(gp);
mtx_destroy(&sc->sc_mtx);
g_free(sc);
return (NULL);
}
dev = sc->sc_dev;
dev->si_flags |= SI_UNMAPPED;
dev->si_iosize_max = maxphys;
error = init_dumpdev(dev);
if (error != 0)
printf("%s: init_dumpdev() failed (gp->name=%s, error=%d)\n",
__func__, gp->name, error);
g_dev_attrchanged(cp, "GEOM::physpath");
snprintf(buf, sizeof(buf), "cdev=%s", gp->name);
devctl_notify("GEOM", "DEV", "CREATE", buf);
/*
* Now add all the aliases for this drive
*/
LIST_FOREACH(gap, &pp->aliases, ga_next) {
error = make_dev_alias_p(MAKEDEV_CHECKNAME | MAKEDEV_WAITOK, &adev, dev,
"%s", gap->ga_alias);
if (error) {
printf("%s: make_dev_alias_p() failed (name=%s, error=%d)\n",
__func__, gap->ga_alias, error);
continue;
}
snprintf(buf, sizeof(buf), "cdev=%s", gap->ga_alias);
devctl_notify("GEOM", "DEV", "CREATE", buf);
}
return (gp);
}
static int
g_dev_open(struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct g_consumer *cp;
struct g_dev_softc *sc;
int error, r, w, e;
cp = dev->si_drv2;
g_trace(G_T_ACCESS, "g_dev_open(%s, %d, %d, %p)",
cp->geom->name, flags, fmt, td);
r = flags & FREAD ? 1 : 0;
w = flags & FWRITE ? 1 : 0;
#ifdef notyet
e = flags & O_EXCL ? 1 : 0;
#else
e = 0;
#endif
/*
* This happens on attempt to open a device node with O_EXEC.
*/
if (r + w + e == 0)
return (EINVAL);
if (w) {
/*
* When running in very secure mode, do not allow
* opens for writing of any disks.
*/
error = securelevel_ge(td->td_ucred, 2);
if (error)
return (error);
}
g_topology_lock();
error = g_access(cp, r, w, e);
g_topology_unlock();
if (error == 0) {
sc = dev->si_drv1;
mtx_lock(&sc->sc_mtx);
if (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0)
wakeup(&sc->sc_active);
sc->sc_open += r + w + e;
if (sc->sc_open == 0)
atomic_clear_int(&sc->sc_active, SC_A_OPEN);
else
atomic_set_int(&sc->sc_active, SC_A_OPEN);
mtx_unlock(&sc->sc_mtx);
}
return (error);
}
static int
g_dev_close(struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct g_consumer *cp;
struct g_dev_softc *sc;
int error, r, w, e;
cp = dev->si_drv2;
g_trace(G_T_ACCESS, "g_dev_close(%s, %d, %d, %p)",
cp->geom->name, flags, fmt, td);
r = flags & FREAD ? -1 : 0;
w = flags & FWRITE ? -1 : 0;
#ifdef notyet
e = flags & O_EXCL ? -1 : 0;
#else
e = 0;
#endif
/*
* The vgonel(9) - caused by eg. forced unmount of devfs - calls
* VOP_CLOSE(9) on devfs vnode without any FREAD or FWRITE flags,
* which would result in zero deltas, which in turn would cause
* panic in g_access(9).
*
* Note that we cannot zero the counters (ie. do "r = cp->acr"
* etc) instead, because the consumer might be opened in another
* devfs instance.
*/
if (r + w + e == 0)
return (EINVAL);
sc = dev->si_drv1;
mtx_lock(&sc->sc_mtx);
sc->sc_open += r + w + e;
if (sc->sc_open == 0)
atomic_clear_int(&sc->sc_active, SC_A_OPEN);
else
atomic_set_int(&sc->sc_active, SC_A_OPEN);
while (sc->sc_open == 0 && (sc->sc_active & SC_A_ACTIVE) != 0)
msleep(&sc->sc_active, &sc->sc_mtx, 0, "g_dev_close", hz / 10);
mtx_unlock(&sc->sc_mtx);
g_topology_lock();
error = g_access(cp, r, w, e);
g_topology_unlock();
return (error);
}
static int
g_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td)
{
struct g_consumer *cp;
struct g_provider *pp;
off_t offset, length, chunk, odd;
int i, error;
#ifdef COMPAT_FREEBSD12
struct diocskerneldump_arg kda_copy;
#endif
cp = dev->si_drv2;
pp = cp->provider;
/* If consumer or provider is dying, don't disturb. */
if (cp->flags & G_CF_ORPHAN)
return (ENXIO);
if (pp->error)
return (pp->error);
error = 0;
KASSERT(cp->acr || cp->acw,
("Consumer with zero access count in g_dev_ioctl"));
i = IOCPARM_LEN(cmd);
switch (cmd) {
case DIOCGSECTORSIZE:
*(u_int *)data = pp->sectorsize;
if (*(u_int *)data == 0)
error = ENOENT;
break;
case DIOCGMEDIASIZE:
*(off_t *)data = pp->mediasize;
if (*(off_t *)data == 0)
error = ENOENT;
break;
case DIOCGFWSECTORS:
error = g_io_getattr("GEOM::fwsectors", cp, &i, data);
if (error == 0 && *(u_int *)data == 0)
error = ENOENT;
break;
case DIOCGFWHEADS:
error = g_io_getattr("GEOM::fwheads", cp, &i, data);
if (error == 0 && *(u_int *)data == 0)
error = ENOENT;
break;
#ifdef COMPAT_FREEBSD11
case DIOCSKERNELDUMP_FREEBSD11:
{
struct diocskerneldump_arg kda;
gone_in(13, "FreeBSD 11.x ABI compat");
bzero(&kda, sizeof(kda));
kda.kda_encryption = KERNELDUMP_ENC_NONE;
kda.kda_index = (*(u_int *)data ? 0 : KDA_REMOVE_ALL);
if (kda.kda_index == KDA_REMOVE_ALL)
error = dumper_remove(devtoname(dev), &kda);
else
error = g_dev_setdumpdev(dev, &kda);
break;
}
#endif
#ifdef COMPAT_FREEBSD12
case DIOCSKERNELDUMP_FREEBSD12:
{
struct diocskerneldump_arg_freebsd12 *kda12;
gone_in(14, "FreeBSD 12.x ABI compat");
kda12 = (void *)data;
memcpy(&kda_copy, kda12, sizeof(kda_copy));
kda_copy.kda_index = (kda12->kda12_enable ?
0 : KDA_REMOVE_ALL);
explicit_bzero(kda12, sizeof(*kda12));
/* Kludge to pass kda_copy to kda in fallthrough. */
data = (void *)&kda_copy;
}
/* FALLTHROUGH */
#endif
case DIOCSKERNELDUMP:
{
struct diocskerneldump_arg *kda;
uint8_t *encryptedkey;
kda = (struct diocskerneldump_arg *)data;
if (kda->kda_index == KDA_REMOVE_ALL ||
kda->kda_index == KDA_REMOVE_DEV ||
kda->kda_index == KDA_REMOVE) {
error = dumper_remove(devtoname(dev), kda);
explicit_bzero(kda, sizeof(*kda));
break;
}
if (kda->kda_encryption != KERNELDUMP_ENC_NONE) {
if (kda->kda_encryptedkeysize == 0 ||
kda->kda_encryptedkeysize >
KERNELDUMP_ENCKEY_MAX_SIZE) {
explicit_bzero(kda, sizeof(*kda));
return (EINVAL);
}
encryptedkey = malloc(kda->kda_encryptedkeysize, M_TEMP,
M_WAITOK);
error = copyin(kda->kda_encryptedkey, encryptedkey,
kda->kda_encryptedkeysize);
} else {
encryptedkey = NULL;
}
if (error == 0) {
kda->kda_encryptedkey = encryptedkey;
error = g_dev_setdumpdev(dev, kda);
}
zfree(encryptedkey, M_TEMP);
explicit_bzero(kda, sizeof(*kda));
break;
}
case DIOCGFLUSH:
error = g_io_flush(cp);
break;
case DIOCGDELETE:
offset = ((off_t *)data)[0];
length = ((off_t *)data)[1];
if ((offset % pp->sectorsize) != 0 ||
(length % pp->sectorsize) != 0 || length <= 0) {
printf("%s: offset=%jd length=%jd\n", __func__, offset,
length);
error = EINVAL;
break;
}
if ((pp->mediasize > 0) && (offset >= pp->mediasize)) {
/*
* Catch out-of-bounds requests here. The problem is
* that due to historical GEOM I/O implementation
* peculatities, g_delete_data() would always return
* success for requests starting just the next byte
* after providers media boundary. Condition check on
* non-zero media size, since that condition would
* (most likely) cause ENXIO instead.
*/
error = EIO;
break;
}
while (length > 0) {
chunk = length;
if (g_dev_del_max_sectors != 0 &&
chunk > g_dev_del_max_sectors * pp->sectorsize) {
chunk = g_dev_del_max_sectors * pp->sectorsize;
if (pp->stripesize > 0) {
odd = (offset + chunk +
pp->stripeoffset) % pp->stripesize;
if (chunk > odd)
chunk -= odd;
}
}
error = g_delete_data(cp, offset, chunk);
length -= chunk;
offset += chunk;
if (error)
break;
/*
* Since the request size can be large, the service
* time can be is likewise. We make this ioctl
* interruptible by checking for signals for each bio.
*/
if (SIGPENDING(td))
break;
}
break;
case DIOCGIDENT:
error = g_io_getattr("GEOM::ident", cp, &i, data);
break;
case DIOCGPROVIDERNAME:
strlcpy(data, pp->name, i);
break;
case DIOCGSTRIPESIZE:
*(off_t *)data = pp->stripesize;
break;
case DIOCGSTRIPEOFFSET:
*(off_t *)data = pp->stripeoffset;
break;
case DIOCGPHYSPATH:
error = g_io_getattr("GEOM::physpath", cp, &i, data);
if (error == 0 && *(char *)data == '\0')
error = ENOENT;
break;
case DIOCGATTR: {
struct diocgattr_arg *arg = (struct diocgattr_arg *)data;
if (arg->len > sizeof(arg->value)) {
error = EINVAL;
break;
}
error = g_io_getattr(arg->name, cp, &arg->len, &arg->value);
break;
}
case DIOCZONECMD: {
struct disk_zone_args *zone_args =(struct disk_zone_args *)data;
struct disk_zone_rep_entry *new_entries, *old_entries;
struct disk_zone_report *rep;
size_t alloc_size;
old_entries = NULL;
new_entries = NULL;
rep = NULL;
alloc_size = 0;
if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES) {
rep = &zone_args->zone_params.report;
#define MAXENTRIES (maxphys / sizeof(struct disk_zone_rep_entry))
if (rep->entries_allocated > MAXENTRIES)
rep->entries_allocated = MAXENTRIES;
alloc_size = rep->entries_allocated *
sizeof(struct disk_zone_rep_entry);
if (alloc_size != 0)
new_entries = g_malloc(alloc_size,
M_WAITOK | M_ZERO);
old_entries = rep->entries;
rep->entries = new_entries;
}
error = g_io_zonecmd(zone_args, cp);
if (zone_args->zone_cmd == DISK_ZONE_REPORT_ZONES &&
alloc_size != 0 && error == 0)
error = copyout(new_entries, old_entries, alloc_size);
if (old_entries != NULL && rep != NULL)
rep->entries = old_entries;
if (new_entries != NULL)
g_free(new_entries);
break;
}
default:
if (pp->geom->ioctl != NULL) {
error = pp->geom->ioctl(pp, cmd, data, fflag, td);
} else {
error = ENOIOCTL;
}
}
return (error);
}
static void
g_dev_done(struct bio *bp2)
{
struct g_consumer *cp;
struct g_dev_softc *sc;
struct bio *bp;
int active;
cp = bp2->bio_from;
sc = cp->private;
bp = bp2->bio_parent;
bp->bio_error = bp2->bio_error;
bp->bio_completed = bp2->bio_completed;
bp->bio_resid = bp->bio_length - bp2->bio_completed;
if (bp2->bio_cmd == BIO_ZONE)
bcopy(&bp2->bio_zone, &bp->bio_zone, sizeof(bp->bio_zone));
if (bp2->bio_error != 0) {
g_trace(G_T_BIO, "g_dev_done(%p) had error %d",
bp2, bp2->bio_error);
bp->bio_flags |= BIO_ERROR;
} else {
g_trace(G_T_BIO, "g_dev_done(%p/%p) resid %ld completed %jd",
bp2, bp, bp2->bio_resid, (intmax_t)bp2->bio_completed);
}
g_destroy_bio(bp2);
active = atomic_fetchadd_int(&sc->sc_active, -1) - 1;
if ((active & SC_A_ACTIVE) == 0) {
if ((active & SC_A_OPEN) == 0)
wakeup(&sc->sc_active);
if (active & SC_A_DESTROY)
g_post_event(g_dev_destroy, cp, M_NOWAIT, NULL);
}
biodone(bp);
}
static void
g_dev_strategy(struct bio *bp)
{
struct g_consumer *cp;
struct bio *bp2;
struct cdev *dev;
struct g_dev_softc *sc;
KASSERT(bp->bio_cmd == BIO_READ ||
bp->bio_cmd == BIO_WRITE ||
bp->bio_cmd == BIO_DELETE ||
bp->bio_cmd == BIO_FLUSH ||
bp->bio_cmd == BIO_ZONE,
("Wrong bio_cmd bio=%p cmd=%d", bp, bp->bio_cmd));
dev = bp->bio_dev;
cp = dev->si_drv2;
KASSERT(cp->acr || cp->acw,
("Consumer with zero access count in g_dev_strategy"));
biotrack(bp, __func__);
#ifdef INVARIANTS
if ((bp->bio_offset % cp->provider->sectorsize) != 0 ||
(bp->bio_bcount % cp->provider->sectorsize) != 0) {
bp->bio_resid = bp->bio_bcount;
biofinish(bp, NULL, EINVAL);
return;
}
#endif
sc = dev->si_drv1;
KASSERT(sc->sc_open > 0, ("Closed device in g_dev_strategy"));
atomic_add_int(&sc->sc_active, 1);
for (;;) {
/*
* XXX: This is not an ideal solution, but I believe it to
* XXX: deadlock safely, all things considered.
*/
bp2 = g_clone_bio(bp);
if (bp2 != NULL)
break;
pause("gdstrat", hz / 10);
}
KASSERT(bp2 != NULL, ("XXX: ENOMEM in a bad place"));
bp2->bio_done = g_dev_done;
g_trace(G_T_BIO,
"g_dev_strategy(%p/%p) offset %jd length %jd data %p cmd %d",
bp, bp2, (intmax_t)bp->bio_offset, (intmax_t)bp2->bio_length,
bp2->bio_data, bp2->bio_cmd);
g_io_request(bp2, cp);
KASSERT(cp->acr || cp->acw,
("g_dev_strategy raced with g_dev_close and lost"));
}
/*
* g_dev_callback()
*
* Called by devfs when asynchronous device destruction is completed.
* - Mark that we have no attached device any more.
* - If there are no outstanding requests, schedule geom destruction.
* Otherwise destruction will be scheduled later by g_dev_done().
*/
static void
g_dev_callback(void *arg)
{
struct g_consumer *cp;
struct g_dev_softc *sc;
int active;
cp = arg;
sc = cp->private;
g_trace(G_T_TOPOLOGY, "g_dev_callback(%p(%s))", cp, cp->geom->name);
sc->sc_dev = NULL;
sc->sc_alias = NULL;
active = atomic_fetchadd_int(&sc->sc_active, SC_A_DESTROY);
if ((active & SC_A_ACTIVE) == 0)
g_post_event(g_dev_destroy, cp, M_WAITOK, NULL);
}
/*
* g_dev_orphan()
*
* Called from below when the provider orphaned us.
* - Clear any dump settings.
* - Request asynchronous device destruction to prevent any more requests
* from coming in. The provider is already marked with an error, so
* anything which comes in the interim will be returned immediately.
*/
static void
g_dev_orphan(struct g_consumer *cp)
{
struct cdev *dev;
struct g_dev_softc *sc;
g_topology_assert();
sc = cp->private;
dev = sc->sc_dev;
g_trace(G_T_TOPOLOGY, "g_dev_orphan(%p(%s))", cp, cp->geom->name);
/* Reset any dump-area set on this device */
if (dev->si_flags & SI_DUMPDEV) {
struct diocskerneldump_arg kda;
bzero(&kda, sizeof(kda));
kda.kda_index = KDA_REMOVE_DEV;
(void)dumper_remove(devtoname(dev), &kda);
}
/* Destroy the struct cdev *so we get no more requests */
delist_dev(dev);
destroy_dev_sched_cb(dev, g_dev_callback, cp);
}
DECLARE_GEOM_CLASS(g_dev_class, g_dev);
