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40ea77a036
freebsd-dev/sys/geom/geom_disk.c
Alexander Motin 40ea77a036 Merge GEOM direct dispatch changes from the projects/camlock branch. 
When safety requirements are met, it allows to avoid passing I/O requests
to GEOM g_up/g_down thread, executing them directly in the caller context.
That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid
several context switches per I/O.

The defined now safety requirements are:
 - caller should not hold any locks and should be reenterable;
 - callee should not depend on GEOM dual-threaded concurency semantics;
 - on the way down, if request is unmapped while callee doesn't support it,
   the context should be sleepable;
 - kernel thread stack usage should be below 50%.

To keep compatibility with GEOM classes not meeting above requirements
new provider and consumer flags added:
 - G_CF_DIRECT_SEND -- consumer code meets caller requirements (request);
 - G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done);
 - G_PF_DIRECT_SEND -- provider code meets caller requirements (done);
 - G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request).
Capable GEOM class can set them, allowing direct dispatch in cases where
it is safe.  If any of requirements are not met, request is queued to
g_up or g_down thread same as before.

Such GEOM classes were reviewed and updated to support direct dispatch:
CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE,
VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL,
MAP, FLASHMAP, etc).

To declare direct completion capability disk(9) KPI got new flag equivalent
to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION.  da(4) and ada(4) disk
drivers got it set now thanks to earlier CAM locking work.

This change more then twice increases peak block storage performance on
systems with manu CPUs, together with earlier CAM locking changes reaching
more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to
256 user-level threads).

Sponsored by:	iXsystems, Inc.
MFC after:	2 months
2013-10-22 08:22:19 +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/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;
struct mtx start_mtx;
};
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 bintime now;
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;
binuptime(&now);
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_bt(sc->dp->d_devstat, bp, &now);
bp2->bio_inbed++;
if (bp2->bio_children == bp2->bio_inbed) {
mtx_unlock(&sc->done_mtx);
bp2->bio_resid = bp2->bio_bcount - bp2->bio_completed;
g_io_deliver(bp2, bp2->bio_error);
} else
mtx_unlock(&sc->done_mtx);
g_destroy_bio(bp);
}
static void
g_disk_done_single(struct bio *bp)
{
struct bintime now;
struct g_disk_softc *sc;
bp->bio_completed = bp->bio_length - bp->bio_resid;
bp->bio_done = (void *)bp->bio_to;
bp->bio_to = LIST_FIRST(&bp->bio_disk->d_geom->provider);
if ((bp->bio_cmd & (BIO_READ|BIO_WRITE|BIO_DELETE)) != 0) {
binuptime(&now);
sc = bp->bio_to->private;
mtx_lock(&sc->done_mtx);
devstat_end_transaction_bio_bt(sc->dp->d_devstat, bp, &now);
mtx_unlock(&sc->done_mtx);
}
g_io_deliver(bp, bp->bio_error);
}
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 d_maxsize, 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:
d_maxsize = (bp->bio_cmd == BIO_DELETE) ?
dp->d_delmaxsize : dp->d_maxsize;
if (bp->bio_length <= d_maxsize) {
bp->bio_disk = dp;
bp->bio_to = (void *)bp->bio_done;
bp->bio_done = g_disk_done_single;
bp->bio_pblkno = bp->bio_offset / dp->d_sectorsize;
bp->bio_bcount = bp->bio_length;
mtx_lock(&sc->start_mtx);
devstat_start_transaction_bio(dp->d_devstat, bp);
mtx_unlock(&sc->start_mtx);
g_disk_lock_giant(dp);
dp->d_strategy(bp);
g_disk_unlock_giant(dp);
break;
}
off = 0;
bp3 = NULL;
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
error = ENOMEM;
break;
}
do {
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;
mtx_lock(&sc->start_mtx);
devstat_start_transaction_bio(dp->d_devstat, bp2);
mtx_unlock(&sc->start_mtx);
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;
}
bp->bio_disk = dp;
bp->bio_to = (void *)bp->bio_done;
bp->bio_done = g_disk_done_single;
g_disk_lock_giant(dp);
dp->d_strategy(bp);
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);
bp->bio_attribute = "GEOM::lunname";
bp->bio_length = DISK_IDENT_SIZE;
bp->bio_data = buf;
if (dp->d_getattr(bp) == 0)
sbuf_printf(sb, "%s<lunname>%s</lunname>\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->start_mtx, "g_disk_start", NULL, MTX_DEF);
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);
devstat_remove_entry(pp->stat);
pp->stat = NULL;
dp->d_devstat->id = pp;
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 ((dp->d_flags & DISKFLAG_DIRECT_COMPLETION) != 0)
pp->flags |= G_PF_DIRECT_SEND;
pp->flags |= G_PF_DIRECT_RECEIVE;
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);
mtx_destroy(&sc->start_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");
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