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freebsd-dev/sys/geom/geom_disk.c
Warner Losh 47aeda7b70 geom_disk: use a preallocated geom_event for disk destruction. 
Preallocate a geom_event (using the new geom_alloc_event) when we create
a disk. When we create the disk, we're going to be in a sleepable
context, so we can always allocate this extra bit of memory. Then use
this preallocated memory to free the disk. CAM can try to free the disk
from an unsleepable context if there was I/O outstanding when the disk
was destroyted (say because the SIM said it had gone away). The I/O
context isn't sleepable. Rather than trying to invent a retry mechanism
and making sure all the other geom_disk consumers did it properly,
preallocating the event ensure that the geom_disk will be properly torn
down, even when there's memory pressure when the disk departs.

Reviewd by:		jhb
Sponsored by:		Netflix
Differential Revision:	https://reviews.freebsd.org/D30544
2021-07-23 18:08:52 -06:00

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/*-
* 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 "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/devctl.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/sbuf.h>
#include <sys/devicestat.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>
#include <machine/bus.h>
struct g_disk_softc {
struct disk *dp;
struct devstat *d_devstat;
struct sysctl_ctx_list sysctl_ctx;
struct sysctl_oid *sysctl_tree;
char led[64];
uint32_t state;
struct mtx done_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 int g_disk_sysctl_flags(SYSCTL_HANDLER_ARGS);
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 | CTLFLAG_MPSAFE, 0,
"GEOM_DISK stuff");
DECLARE_GEOM_CLASS(g_disk_class, g_disk);
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 ((dp = sc->dp) == NULL || dp->d_destroyed) {
/*
* Allow decreasing access count even if disk is not
* available 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) {
/*
* It would be better to defer this decision to d_open if
* it was able to take flags.
*/
if (w > 0 && (dp->d_flags & DISKFLAG_WRITE_PROTECT) != 0)
error = EROFS;
if (error == 0 && dp->d_open != NULL)
error = dp->d_open(dp);
if (bootverbose && error != 0)
printf("Opened disk %s -> %d\n", pp->name, error);
if (error != 0)
return (error);
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;
/*
* Do not invoke resize event when initial size was zero.
* Some disks report its size only after first opening.
*/
if (pp->mediasize == 0)
pp->mediasize = dp->d_mediasize;
else
g_resize_provider(pp, dp->d_mediasize);
} else if ((pp->acr + pp->acw + pp->ace) > 0 && (r + w + e) == 0) {
if (dp->d_close != NULL) {
error = dp->d_close(dp);
if (error != 0)
printf("Closed disk %s -> %d\n",
pp->name, error);
}
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_kerneldump(%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 */
sc = bp->bio_caller1;
bp2 = bp->bio_parent;
binuptime(&now);
mtx_lock(&sc->done_mtx);
if (bp2->bio_error == 0)
bp2->bio_error = bp->bio_error;
bp2->bio_completed += bp->bio_length - bp->bio_resid;
switch (bp->bio_cmd) {
case BIO_ZONE:
bcopy(&bp->bio_zone, &bp2->bio_zone, sizeof(bp->bio_zone));
/*FALLTHROUGH*/
case BIO_READ:
case BIO_WRITE:
case BIO_DELETE:
case BIO_FLUSH:
devstat_end_transaction_bio_bt(sc->d_devstat, bp, &now);
break;
default:
break;
}
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 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;
sc = pp->private;
dp = sc->dp;
KASSERT(dp != NULL && !dp->d_destroyed,
("g_disk_ioctl(%lx) on destroyed disk %s", cmd, pp->name));
if (dp->d_ioctl == NULL)
return (ENOIOCTL);
return (dp->d_ioctl(dp, cmd, data, fflag, td));
}
static off_t
g_disk_maxsize(struct disk *dp, struct bio *bp)
{
if (bp->bio_cmd == BIO_DELETE)
return (dp->d_delmaxsize);
return (dp->d_maxsize);
}
static int
g_disk_maxsegs(struct disk *dp, struct bio *bp)
{
return ((g_disk_maxsize(dp, bp) / PAGE_SIZE) + 1);
}
static void
g_disk_advance(struct disk *dp, struct bio *bp, off_t off)
{
bp->bio_offset += off;
bp->bio_length -= off;
if ((bp->bio_flags & BIO_VLIST) != 0) {
bus_dma_segment_t *seg, *end;
seg = (bus_dma_segment_t *)bp->bio_data;
end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n;
off += bp->bio_ma_offset;
while (off >= seg->ds_len) {
KASSERT((seg != end),
("vlist request runs off the end"));
off -= seg->ds_len;
seg++;
}
bp->bio_ma_offset = off;
bp->bio_ma_n = end - seg;
bp->bio_data = (void *)seg;
} else if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
bp->bio_ma += off / PAGE_SIZE;
bp->bio_ma_offset += off;
bp->bio_ma_offset %= PAGE_SIZE;
bp->bio_ma_n -= off / PAGE_SIZE;
} else {
bp->bio_data += off;
}
}
static void
g_disk_seg_limit(bus_dma_segment_t *seg, off_t *poffset,
off_t *plength, int *ppages)
{
uintptr_t seg_page_base;
uintptr_t seg_page_end;
off_t offset;
off_t length;
int seg_pages;
offset = *poffset;
length = *plength;
if (length > seg->ds_len - offset)
length = seg->ds_len - offset;
seg_page_base = trunc_page(seg->ds_addr + offset);
seg_page_end = round_page(seg->ds_addr + offset + length);
seg_pages = (seg_page_end - seg_page_base) >> PAGE_SHIFT;
if (seg_pages > *ppages) {
seg_pages = *ppages;
length = (seg_page_base + (seg_pages << PAGE_SHIFT)) -
(seg->ds_addr + offset);
}
*poffset = 0;
*plength -= length;
*ppages -= seg_pages;
}
static off_t
g_disk_vlist_limit(struct disk *dp, struct bio *bp, bus_dma_segment_t **pendseg)
{
bus_dma_segment_t *seg, *end;
off_t residual;
off_t offset;
int pages;
seg = (bus_dma_segment_t *)bp->bio_data;
end = (bus_dma_segment_t *)bp->bio_data + bp->bio_ma_n;
residual = bp->bio_length;
offset = bp->bio_ma_offset;
pages = g_disk_maxsegs(dp, bp);
while (residual != 0 && pages != 0) {
KASSERT((seg != end),
("vlist limit runs off the end"));
g_disk_seg_limit(seg, &offset, &residual, &pages);
seg++;
}
if (pendseg != NULL)
*pendseg = seg;
return (residual);
}
static bool
g_disk_limit(struct disk *dp, struct bio *bp)
{
bool limited = false;
off_t maxsz;
maxsz = g_disk_maxsize(dp, bp);
/*
* 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.
*/
if (bp->bio_length > maxsz) {
bp->bio_length = maxsz;
limited = true;
}
if ((bp->bio_flags & BIO_VLIST) != 0) {
bus_dma_segment_t *firstseg, *endseg;
off_t residual;
firstseg = (bus_dma_segment_t*)bp->bio_data;
residual = g_disk_vlist_limit(dp, bp, &endseg);
if (residual != 0) {
bp->bio_ma_n = endseg - firstseg;
bp->bio_length -= residual;
limited = true;
}
} else if ((bp->bio_flags & BIO_UNMAPPED) != 0) {
bp->bio_ma_n =
howmany(bp->bio_ma_offset + bp->bio_length, PAGE_SIZE);
}
return (limited);
}
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;
biotrack(bp, __func__);
sc = bp->bio_to->private;
dp = sc->dp;
KASSERT(dp != NULL && !dp->d_destroyed,
("g_disk_start(%p) on destroyed disk %s", bp, bp->bio_to->name));
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:
KASSERT((dp->d_flags & DISKFLAG_UNMAPPED_BIO) != 0 ||
(bp->bio_flags & BIO_UNMAPPED) == 0,
("unmapped bio not supported by disk %s", dp->d_name));
off = 0;
bp3 = NULL;
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
error = ENOMEM;
break;
}
for (;;) {
if (g_disk_limit(dp, bp2)) {
off += bp2->bio_length;
/*
* 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_caller1 = sc;
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);
dp->d_strategy(bp2);
if (bp3 == NULL)
break;
bp2 = bp3;
bp3 = NULL;
g_disk_advance(dp, bp2, off);
}
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_str(bp, "GEOM::ident", dp->d_ident))
break;
else if (g_handleattr_str(bp, "GEOM::descr", dp->d_descr))
break;
else if (g_handleattr_uint16_t(bp, "GEOM::hba_vendor",
dp->d_hba_vendor))
break;
else if (g_handleattr_uint16_t(bp, "GEOM::hba_device",
dp->d_hba_device))
break;
else if (g_handleattr_uint16_t(bp, "GEOM::hba_subvendor",
dp->d_hba_subvendor))
break;
else if (g_handleattr_uint16_t(bp, "GEOM::hba_subdevice",
dp->d_hba_subdevice))
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 if (g_handleattr_uint16_t(bp, "GEOM::rotation_rate",
dp->d_rotation_rate))
break;
else if (g_handleattr_str(bp, "GEOM::attachment",
dp->d_attachment))
break;
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;
}
/*FALLTHROUGH*/
case BIO_ZONE:
if (bp->bio_cmd == BIO_ZONE) {
if (!(dp->d_flags & DISKFLAG_CANZONE)) {
error = EOPNOTSUPP;
break;
}
g_trace(G_T_BIO, "g_disk_zone(%s)",
bp->bio_to->name);
}
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
bp2->bio_done = g_disk_done;
bp2->bio_caller1 = sc;
bp2->bio_disk = dp;
devstat_start_transaction_bio(dp->d_devstat, bp2);
dp->d_strategy(bp2);
break;
case BIO_SPEEDUP:
bp2 = g_clone_bio(bp);
if (bp2 == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
bp2->bio_done = g_disk_done;
bp2->bio_caller1 = sc;
bp2->bio_disk = dp;
dp->d_strategy(bp2);
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);
/*
* "rotationrate" is a little complicated, because the value
* returned by the drive might not be the RPM; 0 and 1 are
* special cases, and there's also a valid range.
*/
sbuf_printf(sb, "%s<rotationrate>", indent);
if (dp->d_rotation_rate == DISK_RR_UNKNOWN) /* Old drives */
sbuf_cat(sb, "unknown"); /* don't report RPM. */
else if (dp->d_rotation_rate == DISK_RR_NON_ROTATING)
sbuf_cat(sb, "0");
else if ((dp->d_rotation_rate >= DISK_RR_MIN) &&
(dp->d_rotation_rate <= DISK_RR_MAX))
sbuf_printf(sb, "%u", dp->d_rotation_rate);
else
sbuf_cat(sb, "invalid");
sbuf_cat(sb, "</rotationrate>\n");
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>", indent);
g_conf_cat_escaped(sb, res == 0 ? buf : dp->d_ident);
sbuf_cat(sb, "</ident>\n");
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>", indent);
g_conf_cat_escaped(sb, buf);
sbuf_cat(sb, "</lunid>\n");
}
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>", indent);
g_conf_cat_escaped(sb, buf);
sbuf_cat(sb, "</lunname>\n");
}
g_destroy_bio(bp);
g_free(buf);
} else {
sbuf_printf(sb, "%s<ident>", indent);
g_conf_cat_escaped(sb, dp->d_ident);
sbuf_cat(sb, "</ident>\n");
}
sbuf_printf(sb, "%s<descr>", indent);
g_conf_cat_escaped(sb, dp->d_descr);
sbuf_cat(sb, "</descr>\n");
}
}
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;
struct disk_alias *dap;
char tmpstr[80];
if (flag == EV_CANCEL)
return;
g_topology_assert();
dp = arg;
mtx_pool_lock(mtxpool_sleep, dp);
dp->d_init_level = DISK_INIT_START;
/*
* If the disk has already gone away, we can just stop here and
* call the user's callback to tell him we've cleaned things up.
*/
if (dp->d_goneflag != 0) {
mtx_pool_unlock(mtxpool_sleep, dp);
if (dp->d_gone != NULL)
dp->d_gone(dp);
return;
}
mtx_pool_unlock(mtxpool_sleep, dp);
sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
mtx_init(&sc->done_mtx, "g_disk_done", NULL, MTX_DEF);
sc->dp = dp;
sc->d_devstat = dp->d_devstat;
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);
LIST_FOREACH(dap, &dp->d_aliases, da_next)
g_provider_add_alias(pp, "%s%d", dap->da_alias, dp->d_unit);
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 | CTLFLAG_MPSAFE, 0, tmpstr);
if (sc->sysctl_tree != NULL) {
SYSCTL_ADD_STRING(&sc->sysctl_ctx,
SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "led",
CTLFLAG_RWTUN, sc->led, sizeof(sc->led),
"LED name");
SYSCTL_ADD_PROC(&sc->sysctl_ctx,
SYSCTL_CHILDREN(sc->sysctl_tree), OID_AUTO, "flags",
CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, dp, 0,
g_disk_sysctl_flags, "A", "Report disk flags");
}
pp->private = sc;
dp->d_geom = gp;
g_error_provider(pp, 0);
mtx_pool_lock(mtxpool_sleep, dp);
dp->d_init_level = DISK_INIT_DONE;
/*
* If the disk has gone away at this stage, start the withering
* process for it.
*/
if (dp->d_goneflag != 0) {
mtx_pool_unlock(mtxpool_sleep, dp);
g_wither_provider(pp, ENXIO);
return;
}
mtx_pool_unlock(mtxpool_sleep, dp);
}
/*
* 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;
struct disk_alias *dap, *daptmp;
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);
}
LIST_FOREACH_SAFE(dap, &dp->d_aliases, da_next, daptmp)
g_free(dap);
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)
{
struct disk *dp;
dp = g_malloc(sizeof(struct disk), M_WAITOK | M_ZERO);
LIST_INIT(&dp->d_aliases);
return (dp);
}
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;
}
if (dp->d_flags & DISKFLAG_RESERVED) {
printf("WARNING: Attempt to add non-MPSAFE disk %s%d\n",
dp->d_name, dp->d_unit);
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;
dp->d_event = g_alloc_event(M_WAITOK);
dp->d_init_level = DISK_INIT_NONE;
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)
{
KASSERT(dp->d_event != NULL,
("Disk destroy for %p with event NULL", dp));
disk_gone(dp);
dp->d_destroyed = 1;
g_cancel_event(dp);
if (dp->d_devstat != NULL)
devstat_remove_entry(dp->d_devstat);
g_post_event_ep(g_disk_destroy, dp, dp->d_event, NULL);
}
void
disk_add_alias(struct disk *dp, const char *name)
{
struct disk_alias *dap;
dap = (struct disk_alias *)g_malloc(
sizeof(struct disk_alias) + strlen(name) + 1, M_WAITOK);
strcpy((char *)(dap + 1), name);
dap->da_alias = (const char *)(dap + 1);
LIST_INSERT_HEAD(&dp->d_aliases, dap, da_next);
}
void
disk_gone(struct disk *dp)
{
struct g_geom *gp;
struct g_provider *pp;
mtx_pool_lock(mtxpool_sleep, dp);
/*
* Second wither call makes no sense, plus we can not access the list
* of providers without topology lock after calling wither once.
*/
if (dp->d_goneflag != 0) {
mtx_pool_unlock(mtxpool_sleep, dp);
return;
}
dp->d_goneflag = 1;
/*
* If we're still in the process of creating this disk (the
* g_disk_create() function is still queued, or is in
* progress), the init level will not yet be DISK_INIT_DONE.
*
* If that is the case, g_disk_create() will see d_goneflag
* and take care of cleaning things up.
*
* If the disk has already been created, we default to
* withering the provider as usual below.
*
* If the caller has not set a d_gone() callback, he will
* not be any worse off by returning here, because the geom
* has not been fully setup in any case.
*/
if (dp->d_init_level < DISK_INIT_DONE) {
mtx_pool_unlock(mtxpool_sleep, dp);
return;
}
mtx_pool_unlock(mtxpool_sleep, dp);
gp = dp->d_geom;
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;
char devnamebuf[128];
gp = dp->d_geom;
if (gp != NULL)
LIST_FOREACH(pp, &gp->provider, provider)
(void)g_attr_changed(pp, attr, flag);
snprintf(devnamebuf, sizeof(devnamebuf), "devname=%s%d", dp->d_name,
dp->d_unit);
devctl_notify("GEOM", "disk", attr, devnamebuf);
}
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
g_disk_sysctl_flags(SYSCTL_HANDLER_ARGS)
{
struct disk *dp;
struct sbuf *sb;
int error;
sb = sbuf_new_auto();
dp = (struct disk *)arg1;
sbuf_printf(sb, "%b", dp->d_flags,
"\20"
"\2OPEN"
"\3CANDELETE"
"\4CANFLUSHCACHE"
"\5UNMAPPEDBIO"
"\6DIRECTCOMPLETION"
"\10CANZONE"
"\11WRITEPROTECT");
sbuf_finish(sb);
error = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb) + 1);
sbuf_delete(sb);
return (error);
}
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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