mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-27 11:55:06 +00:00
Code Issues Releases Activity
60fefd1e17
freebsd/sys/geom/geom_disk.c
Steven Hartland 8383a92e5b Bump disk(9) ABI version to signify the addition of d_delmaxsize by r249940. 
Ensure that d_delmaxsize is always set, removing init to 0 which could cause
future issues if use cases change.

Allow kern.cam.da.X.delete_max (which maps to d_delmaxsize) to be increased
up to the calculated max after being reduced.

MFC after:	1 day
X-MFC-With: r249940
2013-07-03 23:46:30 +00:00

768 lines
19 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.
*/
#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/ctype.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/sbuf.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>
#include <dev/led/led.h>
struct g_disk_softc {
struct mtx done_mtx;
struct disk *dp;
struct sysctl_ctx_list sysctl_ctx;
struct sysctl_oid *sysctl_tree;
char led[64];
uint32_t state;
};
static g_access_t g_disk_access;
static g_start_t g_disk_start;
static g_ioctl_t g_disk_ioctl;
static g_dumpconf_t g_disk_dumpconf;
static g_provgone_t g_disk_providergone;
static struct g_class g_disk_class = {
.name = G_DISK_CLASS_NAME,
.version = G_VERSION,
.start = g_disk_start,
.access = g_disk_access,
.ioctl = g_disk_ioctl,
.providergone = g_disk_providergone,
.dumpconf = g_disk_dumpconf,
};
SYSCTL_DECL(_kern_geom);
static SYSCTL_NODE(_kern_geom, OID_AUTO, disk, CTLFLAG_RW, 0,
"GEOM_DISK stuff");
DECLARE_GEOM_CLASS(g_disk_class, g_disk);
static void __inline
g_disk_lock_giant(struct disk *dp)
{
if (dp->d_flags & DISKFLAG_NEEDSGIANT)
mtx_lock(&Giant);
}
static void __inline
g_disk_unlock_giant(struct disk *dp)
{
if (dp->d_flags & DISKFLAG_NEEDSGIANT)
mtx_unlock(&Giant);
}
static int
g_disk_access(struct g_provider *pp, int r, int w, int e)
{
struct disk *dp;
struct g_disk_softc *sc;
int error;
g_trace(G_T_ACCESS, "g_disk_access(%s, %d, %d, %d)",
pp->name, r, w, e);
g_topology_assert();
sc = pp->private;
if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
/*
* Allow decreasing access count even if disk is not
* avaliable anymore.
*/
if (r <= 0 && w <= 0 && e <= 0)
return (0);
return (ENXIO);
}
r += pp->acr;
w += pp->acw;
e += pp->ace;
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 (bootverbose && error != 0)
printf("Opened disk %s -> %d\n",
pp->name, error);
g_disk_unlock_giant(dp);
if (error != 0)
return (error);
}
pp->mediasize = dp->d_mediasize;
pp->sectorsize = dp->d_sectorsize;
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;
}
if (dp->d_delmaxsize == 0) {
if (bootverbose && dp->d_flags & DISKFLAG_CANDELETE) {
printf("WARNING: Disk drive %s%d has no "
"d_delmaxsize\n", dp->d_name, dp->d_unit);
}
dp->d_delmaxsize = dp->d_maxsize;
}
pp->stripeoffset = dp->d_stripeoffset;
pp->stripesize = dp->d_stripesize;
dp->d_flags |= DISKFLAG_OPEN;
} 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);
}
sc->state = G_STATE_ACTIVE;
if (sc->led[0] != 0)
led_set(sc->led, "0");
dp->d_flags &= ~DISKFLAG_OPEN;
}
return (error);
}
static void
g_disk_kerneldump(struct bio *bp, struct disk *dp)
{
struct g_kerneldump *gkd;
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);
if (dp->d_dump == NULL) {
g_io_deliver(bp, ENODEV);
return;
}
gkd->di.dumper = dp->d_dump;
gkd->di.priv = dp;
gkd->di.blocksize = dp->d_sectorsize;
gkd->di.maxiosize = dp->d_maxsize;
gkd->di.mediaoffset = gkd->offset;
if ((gkd->offset + gkd->length) > dp->d_mediasize)
gkd->length = dp->d_mediasize - gkd->offset;
gkd->di.mediasize = gkd->length;
g_io_deliver(bp, 0);
}
static void
g_disk_setstate(struct bio *bp, struct g_disk_softc *sc)
{
const char *cmd;
memcpy(&sc->state, bp->bio_data, sizeof(sc->state));
if (sc->led[0] != 0) {
switch (sc->state) {
case G_STATE_FAILED:
cmd = "1";
break;
case G_STATE_REBUILD:
cmd = "f5";
break;
case G_STATE_RESYNC:
cmd = "f1";
break;
default:
cmd = "0";
break;
}
led_set(sc->led, cmd);
}
g_io_deliver(bp, 0);
}
static void
g_disk_done(struct bio *bp)
{
struct bio *bp2;
struct g_disk_softc *sc;
/* See "notes" for why we need a mutex here */
/* XXX: will witness accept a mix of Giant/unGiant drivers here ? */
bp2 = bp->bio_parent;
sc = bp2->bio_to->private;
bp->bio_completed = bp->bio_length - bp->bio_resid;
mtx_lock(&sc->done_mtx);
if (bp2->bio_error == 0)
bp2->bio_error = bp->bio_error;
bp2->bio_completed += bp->bio_completed;
if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0)
devstat_end_transaction_bio(sc->dp->d_devstat, bp);
g_destroy_bio(bp);
bp2->bio_inbed++;
if (bp2->bio_children == bp2->bio_inbed) {
bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
g_io_deliver(bp2, bp2->bio_error);
}
mtx_unlock(&sc->done_mtx);
}
static int
g_disk_ioctl(struct g_provider *pp, u_long cmd, void * data, int fflag, struct thread *td)
{
struct disk *dp;
struct g_disk_softc *sc;
int error;
sc = pp->private;
dp = sc->dp;
if (dp->d_ioctl == NULL)
return (ENOIOCTL);
g_disk_lock_giant(dp);
error = dp->d_ioctl(dp, cmd, data, fflag, td);
g_disk_unlock_giant(dp);
return (error);
}
static void
g_disk_start(struct bio *bp)
{
struct bio *bp2, *bp3;
struct disk *dp;
struct g_disk_softc *sc;
int error;
off_t off;
sc = bp->bio_to->private;
if (sc == NULL || (dp = sc->dp) == NULL || dp->d_destroyed) {
g_io_deliver(bp, ENXIO);
return;
}
error = EJUSTRETURN;
switch(bp->bio_cmd) {
case BIO_DELETE:
if (!(dp->d_flags & DISKFLAG_CANDELETE)) {
error = EOPNOTSUPP;
break;
}
/* fall-through */
case BIO_READ:
case BIO_WRITE:
off = 0;
bp3 = NULL;
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
error = ENOMEM;
break;
}
do {
off_t d_maxsize;
d_maxsize = (bp->bio_cmd == BIO_DELETE) ?
dp->d_delmaxsize : dp->d_maxsize;
bp2->bio_offset += off;
bp2->bio_length -= off;
if ((bp->bio_flags & BIO_UNMAPPED) == 0) {
bp2->bio_data += off;
} else {
KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO)
!= 0,
("unmapped bio not supported by disk %s",
dp->d_name));
bp2->bio_ma += off / PAGE_SIZE;
bp2->bio_ma_offset += off;
bp2->bio_ma_offset %= PAGE_SIZE;
bp2->bio_ma_n -= off / PAGE_SIZE;
}
if (bp2->bio_length > d_maxsize) {
/*
* XXX: If we have a stripesize we should really
* use it here. Care should be taken in the delete
* case if this is done as deletes can be very
* sensitive to size given how they are processed.
*/
bp2->bio_length = d_maxsize;
if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
bp2->bio_ma_n = howmany(
bp2->bio_ma_offset +
bp2->bio_length, PAGE_SIZE);
}
off += 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_pblkno = bp2->bio_offset / dp->d_sectorsize;
bp2->bio_bcount = bp2->bio_length;
bp2->bio_disk = dp;
devstat_start_transaction_bio(dp->d_devstat, bp2);
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:
/* Give the driver a chance to override */
if (dp->d_getattr != NULL) {
if (bp->bio_disk == NULL)
bp->bio_disk = dp;
error = dp->d_getattr(bp);
if (error != -1)
break;
error = EJUSTRETURN;
}
if (g_handleattr_int(bp, "GEOM::candelete",
(dp->d_flags & DISKFLAG_CANDELETE) != 0))
break;
else 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 (g_handleattr_str(bp, "GEOM::ident", dp->d_ident))
break;
else if (g_handleattr(bp, "GEOM::hba_vendor",
&dp->d_hba_vendor, 2))
break;
else if (g_handleattr(bp, "GEOM::hba_device",
&dp->d_hba_device, 2))
break;
else if (g_handleattr(bp, "GEOM::hba_subvendor",
&dp->d_hba_subvendor, 2))
break;
else if (g_handleattr(bp, "GEOM::hba_subdevice",
&dp->d_hba_subdevice, 2))
break;
else if (!strcmp(bp->bio_attribute, "GEOM::kerneldump"))
g_disk_kerneldump(bp, dp);
else if (!strcmp(bp->bio_attribute, "GEOM::setstate"))
g_disk_setstate(bp, sc);
else
error = ENOIOCTL;
break;
case BIO_FLUSH:
g_trace(G_T_BIO, "g_disk_flushcache(%s)",
bp->bio_to->name);
if (!(dp->d_flags & DISKFLAG_CANFLUSHCACHE)) {
error = EOPNOTSUPP;
break;
}
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
bp2->bio_done = g_disk_done;
bp2->bio_disk = dp;
g_disk_lock_giant(dp);
dp->d_strategy(bp2);
g_disk_unlock_giant(dp);
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 bio *bp;
struct disk *dp;
struct g_disk_softc *sc;
char *buf;
int res = 0;
sc = gp->softc;
if (sc == NULL || (dp = sc->dp) == NULL)
return;
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);
if (dp->d_getattr != NULL) {
buf = g_malloc(DISK_IDENT_SIZE, M_WAITOK);
bp = g_alloc_bio();
bp->bio_disk = dp;
bp->bio_attribute = "GEOM::ident";
bp->bio_length = DISK_IDENT_SIZE;
bp->bio_data = buf;
res = dp->d_getattr(bp);
sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
res == 0 ? buf: dp->d_ident);
bp->bio_attribute = "GEOM::lunid";
bp->bio_length = DISK_IDENT_SIZE;
bp->bio_data = buf;
if (dp->d_getattr(bp) == 0)
sbuf_printf(sb, "%s<lunid>%s</lunid>\n",
indent, buf);
g_destroy_bio(bp);
g_free(buf);
} else
sbuf_printf(sb, "%s<ident>%s</ident>\n", indent,
dp->d_ident);
sbuf_printf(sb, "%s<descr>%s</descr>\n", indent, dp->d_descr);
}
}
static void
g_disk_resize(void *ptr, int flag)
{
struct disk *dp;
struct g_geom *gp;
struct g_provider *pp;
if (flag == EV_CANCEL)
return;
g_topology_assert();
dp = ptr;
gp = dp->d_geom;
if (dp->d_destroyed || gp == NULL)
return;
LIST_FOREACH(pp, &gp->provider, provider) {
if (pp->sectorsize != 0 &&
pp->sectorsize != dp->d_sectorsize)
g_wither_provider(pp, ENXIO);
else
g_resize_provider(pp, dp->d_mediasize);
}
}
static void
g_disk_create(void *arg, int flag)
{
struct g_geom *gp;
struct g_provider *pp;
struct disk *dp;
struct g_disk_softc *sc;
char tmpstr[80];
if (flag == EV_CANCEL)
return;
g_topology_assert();
dp = arg;
sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
sc->dp = dp;
gp = g_new_geomf(&g_disk_class, "%s%d", dp->d_name, dp->d_unit);
gp->softc = sc;
pp = g_new_providerf(gp, "%s", gp->name);
pp->mediasize = dp->d_mediasize;
pp->sectorsize = dp->d_sectorsize;
pp->stripeoffset = dp->d_stripeoffset;
pp->stripesize = dp->d_stripesize;
if ((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0)
pp->flags |= G_PF_ACCEPT_UNMAPPED;
if (bootverbose)
printf("GEOM: new disk %s\n", gp->name);
sysctl_ctx_init(&sc->sysctl_ctx);
snprintf(tmpstr, sizeof(tmpstr), "GEOM disk %s", gp->name);
sc->sysctl_tree = SYSCTL_ADD_NODE(&sc->sysctl_ctx,
SYSCTL_STATIC_CHILDREN(_kern_geom_disk), OID_AUTO, gp->name,
CTLFLAG_RD, 0, tmpstr);
if (sc->sysctl_tree != NULL) {
snprintf(tmpstr, sizeof(tmpstr),
"kern.geom.disk.%s.led", gp->name);
TUNABLE_STR_FETCH(tmpstr, sc->led, sizeof(sc->led));
SYSCTL_ADD_STRING(&sc->sysctl_ctx,
SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
"LED name");
}
pp->private = sc;
dp->d_geom = gp;
g_error_provider(pp, 0);
}
/*
* We get this callback after all of the consumers have gone away, and just
* before the provider is freed. If the disk driver provided a d_gone
* callback, let them know that it is okay to free resources -- they won't
* be getting any more accesses from GEOM.
*/
static void
g_disk_providergone(struct g_provider *pp)
{
struct disk *dp;
struct g_disk_softc *sc;
sc = (struct g_disk_softc *)pp->private;
dp = sc->dp;
if (dp != NULL && dp->d_gone != NULL)
dp->d_gone(dp);
if (sc->sysctl_tree != NULL) {
sysctl_ctx_free(&sc->sysctl_ctx);
sc->sysctl_tree = NULL;
}
if (sc->led[0] != 0) {
led_set(sc->led, "0");
sc->led[0] = 0;
}
pp->private = NULL;
pp->geom->softc = NULL;
mtx_destroy(&sc->done_mtx);
g_free(sc);
}
static void
g_disk_destroy(void *ptr, int flag)
{
struct disk *dp;
struct g_geom *gp;
struct g_disk_softc *sc;
g_topology_assert();
dp = ptr;
gp = dp->d_geom;
if (gp != NULL) {
sc = gp->softc;
if (sc != NULL)
sc->dp = NULL;
dp->d_geom = NULL;
g_wither_geom(gp, ENXIO);
}
g_free(dp);
}
/*
* We only allow printable characters in disk ident,
* the rest is converted to 'x<HH>'.
*/
static void
g_disk_ident_adjust(char *ident, size_t size)
{
char *p, tmp[4], newid[DISK_IDENT_SIZE];
newid[0] = '\0';
for (p = ident; *p != '\0'; p++) {
if (isprint(*p)) {
tmp[0] = *p;
tmp[1] = '\0';
} else {
snprintf(tmp, sizeof(tmp), "x%02hhx",
*(unsigned char *)p);
}
if (strlcat(newid, tmp, sizeof(newid)) >= sizeof(newid))
break;
}
bzero(ident, size);
strlcpy(ident, newid, size);
}
struct disk *
disk_alloc(void)
{
return (g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO));
}
void
disk_create(struct disk *dp, int version)
{
if (version != DISK_VERSION) {
printf("WARNING: Attempt to add disk %s%d %s",
dp->d_name, dp->d_unit,
" using incompatible ABI version of disk(9)\n");
printf("WARNING: Ignoring disk %s%d\n",
dp->d_name, dp->d_unit);
return;
}
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 (dp->d_devstat == NULL)
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_disk_ident_adjust(dp->d_ident, sizeof(dp->d_ident));
g_post_event(g_disk_create, dp, M_WAITOK, dp, NULL);
}
void
disk_destroy(struct disk *dp)
{
g_cancel_event(dp);
dp->d_destroyed = 1;
if (dp->d_devstat != NULL)
devstat_remove_entry(dp->d_devstat);
g_post_event(g_disk_destroy, dp, M_WAITOK, NULL);
}
void
disk_gone(struct disk *dp)
{
struct g_geom *gp;
struct g_provider *pp;
gp = dp->d_geom;
if (gp != NULL) {
pp = LIST_FIRST(&gp->provider);
if (pp != NULL) {
KASSERT(LIST_NEXT(pp, provider) == NULL,
("geom %p has more than one provider", gp));
g_wither_provider(pp, ENXIO);
}
}
}
void
disk_attr_changed(struct disk *dp, const char *attr, int flag)
{
struct g_geom *gp;
struct g_provider *pp;
gp = dp->d_geom;
if (gp != NULL)
LIST_FOREACH(pp, &gp->provider, provider)
(void)g_attr_changed(pp, attr, flag);
}
void
disk_media_changed(struct disk *dp, int flag)
{
struct g_geom *gp;
struct g_provider *pp;
gp = dp->d_geom;
if (gp != NULL) {
pp = LIST_FIRST(&gp->provider);
if (pp != NULL) {
KASSERT(LIST_NEXT(pp, provider) == NULL,
("geom %p has more than one provider", gp));
g_media_changed(pp, flag);
}
}
}
void
disk_media_gone(struct disk *dp, int flag)
{
struct g_geom *gp;
struct g_provider *pp;
gp = dp->d_geom;
if (gp != NULL) {
pp = LIST_FIRST(&gp->provider);
if (pp != NULL) {
KASSERT(LIST_NEXT(pp, provider) == NULL,
("geom %p has more than one provider", gp));
g_media_gone(pp, flag);
}
}
}
int
disk_resize(struct disk *dp, int flag)
{
if (dp->d_destroyed || dp->d_geom == NULL)
return (0);
return (g_post_event(g_disk_resize, dp, flag, 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_auto();
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_MPSAFE, NULL, 0,
sysctl_disks, "A", "names of available disks");
Reference in New Issue View Git Blame Copy Permalink