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freebsd-skq/sys/geom/nop/g_nop.c
Kirk McKusick 10519e1398 When using the destroy option to shut down a nop GEOM module, I/O 
operations already in its queue were not being properly drained.
The GEOM framework does the queue draining, but the module needs
to wait for the draining to happen. The waiting is done by adding
a g_nop_providergone() function to wait for the I/O operations to
finish up. This change is similar to change -r345758 made to the
memory-disk driver.

Submitted by: Chuck Silvers
Tested by:    Chuck Silvers
MFC after:    1 week
Sponsored by: Netflix
2019-05-25 00:07:49 +00:00

776 lines
20 KiB
C
Raw Blame History

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
* All rights reserved.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHORS 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 AUTHORS 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/kernel.h>
#include <sys/module.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/bio.h>
#include <sys/sbuf.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <geom/geom.h>
#include <geom/nop/g_nop.h>
SYSCTL_DECL(_kern_geom);
static SYSCTL_NODE(_kern_geom, OID_AUTO, nop, CTLFLAG_RW, 0, "GEOM_NOP stuff");
static u_int g_nop_debug = 0;
SYSCTL_UINT(_kern_geom_nop, OID_AUTO, debug, CTLFLAG_RW, &g_nop_debug, 0,
"Debug level");
static int g_nop_destroy(struct g_geom *gp, boolean_t force);
static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp,
struct g_geom *gp);
static void g_nop_config(struct gctl_req *req, struct g_class *mp,
const char *verb);
static g_access_t g_nop_access;
static g_dumpconf_t g_nop_dumpconf;
static g_orphan_t g_nop_orphan;
static g_provgone_t g_nop_providergone;
static g_resize_t g_nop_resize;
static g_start_t g_nop_start;
struct g_class g_nop_class = {
.name = G_NOP_CLASS_NAME,
.version = G_VERSION,
.ctlreq = g_nop_config,
.destroy_geom = g_nop_destroy_geom,
.access = g_nop_access,
.dumpconf = g_nop_dumpconf,
.orphan = g_nop_orphan,
.providergone = g_nop_providergone,
.resize = g_nop_resize,
.start = g_nop_start,
};
static void
g_nop_orphan(struct g_consumer *cp)
{
g_topology_assert();
g_nop_destroy(cp->geom, 1);
}
static void
g_nop_resize(struct g_consumer *cp)
{
struct g_nop_softc *sc;
struct g_geom *gp;
struct g_provider *pp;
off_t size;
g_topology_assert();
gp = cp->geom;
sc = gp->softc;
if (sc->sc_explicitsize != 0)
return;
if (cp->provider->mediasize < sc->sc_offset) {
g_nop_destroy(gp, 1);
return;
}
size = cp->provider->mediasize - sc->sc_offset;
LIST_FOREACH(pp, &gp->provider, provider)
g_resize_provider(pp, size);
}
static int
g_nop_dumper(void *priv, void *virtual, vm_offset_t physical, off_t offset,
size_t length)
{
return (0);
}
static void
g_nop_kerneldump(struct bio *bp, struct g_nop_softc *sc)
{
struct g_kerneldump *gkd;
struct g_geom *gp;
struct g_provider *pp;
gkd = (struct g_kerneldump *)bp->bio_data;
gp = bp->bio_to->geom;
g_trace(G_T_TOPOLOGY, "%s(%s, %jd, %jd)", __func__, gp->name,
(intmax_t)gkd->offset, (intmax_t)gkd->length);
pp = LIST_FIRST(&gp->provider);
gkd->di.dumper = g_nop_dumper;
gkd->di.priv = sc;
gkd->di.blocksize = pp->sectorsize;
gkd->di.maxiosize = DFLTPHYS;
gkd->di.mediaoffset = sc->sc_offset + gkd->offset;
if (gkd->offset > sc->sc_explicitsize) {
g_io_deliver(bp, ENODEV);
return;
}
if (gkd->offset + gkd->length > sc->sc_explicitsize)
gkd->length = sc->sc_explicitsize - gkd->offset;
gkd->di.mediasize = gkd->length;
g_io_deliver(bp, 0);
}
static void
g_nop_start(struct bio *bp)
{
struct g_nop_softc *sc;
struct g_geom *gp;
struct g_provider *pp;
struct bio *cbp;
u_int failprob = 0;
gp = bp->bio_to->geom;
sc = gp->softc;
G_NOP_LOGREQ(bp, "Request received.");
mtx_lock(&sc->sc_lock);
switch (bp->bio_cmd) {
case BIO_READ:
sc->sc_reads++;
sc->sc_readbytes += bp->bio_length;
failprob = sc->sc_rfailprob;
break;
case BIO_WRITE:
sc->sc_writes++;
sc->sc_wrotebytes += bp->bio_length;
failprob = sc->sc_wfailprob;
break;
case BIO_DELETE:
sc->sc_deletes++;
break;
case BIO_GETATTR:
sc->sc_getattrs++;
if (sc->sc_physpath &&
g_handleattr_str(bp, "GEOM::physpath", sc->sc_physpath))
;
else if (strcmp(bp->bio_attribute, "GEOM::kerneldump") == 0)
g_nop_kerneldump(bp, sc);
else
/*
* Fallthrough to forwarding the GETATTR down to the
* lower level device.
*/
break;
mtx_unlock(&sc->sc_lock);
return;
case BIO_FLUSH:
sc->sc_flushes++;
break;
case BIO_CMD0:
sc->sc_cmd0s++;
break;
case BIO_CMD1:
sc->sc_cmd1s++;
break;
case BIO_CMD2:
sc->sc_cmd2s++;
break;
}
mtx_unlock(&sc->sc_lock);
if (failprob > 0) {
u_int rval;
rval = arc4random() % 100;
if (rval < failprob) {
G_NOP_LOGREQLVL(1, bp, "Returning error=%d.", sc->sc_error);
g_io_deliver(bp, sc->sc_error);
return;
}
}
cbp = g_clone_bio(bp);
if (cbp == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
cbp->bio_done = g_std_done;
cbp->bio_offset = bp->bio_offset + sc->sc_offset;
pp = LIST_FIRST(&gp->provider);
KASSERT(pp != NULL, ("NULL pp"));
cbp->bio_to = pp;
G_NOP_LOGREQ(cbp, "Sending request.");
g_io_request(cbp, LIST_FIRST(&gp->consumer));
}
static int
g_nop_access(struct g_provider *pp, int dr, int dw, int de)
{
struct g_geom *gp;
struct g_consumer *cp;
int error;
gp = pp->geom;
cp = LIST_FIRST(&gp->consumer);
error = g_access(cp, dr, dw, de);
return (error);
}
static int
g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
int ioerror, u_int rfailprob, u_int wfailprob, off_t offset, off_t size,
u_int secsize, off_t stripesize, off_t stripeoffset, const char *physpath)
{
struct g_nop_softc *sc;
struct g_geom *gp;
struct g_provider *newpp;
struct g_consumer *cp;
char name[64];
int error;
off_t explicitsize;
g_topology_assert();
gp = NULL;
newpp = NULL;
cp = NULL;
if ((offset % pp->sectorsize) != 0) {
gctl_error(req, "Invalid offset for provider %s.", pp->name);
return (EINVAL);
}
if ((size % pp->sectorsize) != 0) {
gctl_error(req, "Invalid size for provider %s.", pp->name);
return (EINVAL);
}
if (offset >= pp->mediasize) {
gctl_error(req, "Invalid offset for provider %s.", pp->name);
return (EINVAL);
}
explicitsize = size;
if (size == 0)
size = pp->mediasize - offset;
if (offset + size > pp->mediasize) {
gctl_error(req, "Invalid size for provider %s.", pp->name);
return (EINVAL);
}
if (secsize == 0)
secsize = pp->sectorsize;
else if ((secsize % pp->sectorsize) != 0) {
gctl_error(req, "Invalid secsize for provider %s.", pp->name);
return (EINVAL);
}
if (secsize > MAXPHYS) {
gctl_error(req, "secsize is too big.");
return (EINVAL);
}
size -= size % secsize;
if ((stripesize % pp->sectorsize) != 0) {
gctl_error(req, "Invalid stripesize for provider %s.", pp->name);
return (EINVAL);
}
if ((stripeoffset % pp->sectorsize) != 0) {
gctl_error(req, "Invalid stripeoffset for provider %s.", pp->name);
return (EINVAL);
}
if (stripesize != 0 && stripeoffset >= stripesize) {
gctl_error(req, "stripeoffset is too big.");
return (EINVAL);
}
snprintf(name, sizeof(name), "%s%s", pp->name, G_NOP_SUFFIX);
LIST_FOREACH(gp, &mp->geom, geom) {
if (strcmp(gp->name, name) == 0) {
gctl_error(req, "Provider %s already exists.", name);
return (EEXIST);
}
}
gp = g_new_geomf(mp, "%s", name);
sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
sc->sc_offset = offset;
sc->sc_explicitsize = explicitsize;
sc->sc_stripesize = stripesize;
sc->sc_stripeoffset = stripeoffset;
if (physpath && strcmp(physpath, G_NOP_PHYSPATH_PASSTHROUGH)) {
sc->sc_physpath = strndup(physpath, MAXPATHLEN, M_GEOM);
} else
sc->sc_physpath = NULL;
sc->sc_error = ioerror;
sc->sc_rfailprob = rfailprob;
sc->sc_wfailprob = wfailprob;
sc->sc_reads = 0;
sc->sc_writes = 0;
sc->sc_deletes = 0;
sc->sc_getattrs = 0;
sc->sc_flushes = 0;
sc->sc_cmd0s = 0;
sc->sc_cmd1s = 0;
sc->sc_cmd2s = 0;
sc->sc_readbytes = 0;
sc->sc_wrotebytes = 0;
mtx_init(&sc->sc_lock, "gnop lock", NULL, MTX_DEF);
gp->softc = sc;
newpp = g_new_providerf(gp, "%s", gp->name);
newpp->flags |= G_PF_DIRECT_SEND | G_PF_DIRECT_RECEIVE;
newpp->mediasize = size;
newpp->sectorsize = secsize;
newpp->stripesize = stripesize;
newpp->stripeoffset = stripeoffset;
cp = g_new_consumer(gp);
cp->flags |= G_CF_DIRECT_SEND | G_CF_DIRECT_RECEIVE;
error = g_attach(cp, pp);
if (error != 0) {
gctl_error(req, "Cannot attach to provider %s.", pp->name);
goto fail;
}
newpp->flags |= pp->flags & G_PF_ACCEPT_UNMAPPED;
g_error_provider(newpp, 0);
G_NOP_DEBUG(0, "Device %s created.", gp->name);
return (0);
fail:
if (cp->provider != NULL)
g_detach(cp);
g_destroy_consumer(cp);
g_destroy_provider(newpp);
mtx_destroy(&sc->sc_lock);
free(sc->sc_physpath, M_GEOM);
g_free(gp->softc);
g_destroy_geom(gp);
return (error);
}
static void
g_nop_providergone(struct g_provider *pp)
{
struct g_geom *gp = pp->geom;
struct g_nop_softc *sc = gp->softc;
gp->softc = NULL;
free(sc->sc_physpath, M_GEOM);
mtx_destroy(&sc->sc_lock);
g_free(sc);
}
static int
g_nop_destroy(struct g_geom *gp, boolean_t force)
{
struct g_nop_softc *sc;
struct g_provider *pp;
g_topology_assert();
sc = gp->softc;
if (sc == NULL)
return (ENXIO);
pp = LIST_FIRST(&gp->provider);
if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
if (force) {
G_NOP_DEBUG(0, "Device %s is still open, so it "
"can't be definitely removed.", pp->name);
} else {
G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).",
pp->name, pp->acr, pp->acw, pp->ace);
return (EBUSY);
}
} else {
G_NOP_DEBUG(0, "Device %s removed.", gp->name);
}
g_wither_geom(gp, ENXIO);
return (0);
}
static int
g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
{
return (g_nop_destroy(gp, 0));
}
static void
g_nop_ctl_create(struct gctl_req *req, struct g_class *mp)
{
struct g_provider *pp;
intmax_t *error, *rfailprob, *wfailprob, *offset, *secsize, *size,
*stripesize, *stripeoffset;
const char *name, *physpath;
char param[16];
int i, *nargs;
g_topology_assert();
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
if (nargs == NULL) {
gctl_error(req, "No '%s' argument", "nargs");
return;
}
if (*nargs <= 0) {
gctl_error(req, "Missing device(s).");
return;
}
error = gctl_get_paraml(req, "error", sizeof(*error));
if (error == NULL) {
gctl_error(req, "No '%s' argument", "error");
return;
}
rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob));
if (rfailprob == NULL) {
gctl_error(req, "No '%s' argument", "rfailprob");
return;
}
if (*rfailprob < -1 || *rfailprob > 100) {
gctl_error(req, "Invalid '%s' argument", "rfailprob");
return;
}
wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob));
if (wfailprob == NULL) {
gctl_error(req, "No '%s' argument", "wfailprob");
return;
}
if (*wfailprob < -1 || *wfailprob > 100) {
gctl_error(req, "Invalid '%s' argument", "wfailprob");
return;
}
offset = gctl_get_paraml(req, "offset", sizeof(*offset));
if (offset == NULL) {
gctl_error(req, "No '%s' argument", "offset");
return;
}
if (*offset < 0) {
gctl_error(req, "Invalid '%s' argument", "offset");
return;
}
size = gctl_get_paraml(req, "size", sizeof(*size));
if (size == NULL) {
gctl_error(req, "No '%s' argument", "size");
return;
}
if (*size < 0) {
gctl_error(req, "Invalid '%s' argument", "size");
return;
}
secsize = gctl_get_paraml(req, "secsize", sizeof(*secsize));
if (secsize == NULL) {
gctl_error(req, "No '%s' argument", "secsize");
return;
}
if (*secsize < 0) {
gctl_error(req, "Invalid '%s' argument", "secsize");
return;
}
stripesize = gctl_get_paraml(req, "stripesize", sizeof(*stripesize));
if (stripesize == NULL) {
gctl_error(req, "No '%s' argument", "stripesize");
return;
}
if (*stripesize < 0) {
gctl_error(req, "Invalid '%s' argument", "stripesize");
return;
}
stripeoffset = gctl_get_paraml(req, "stripeoffset", sizeof(*stripeoffset));
if (stripeoffset == NULL) {
gctl_error(req, "No '%s' argument", "stripeoffset");
return;
}
if (*stripeoffset < 0) {
gctl_error(req, "Invalid '%s' argument", "stripeoffset");
return;
}
physpath = gctl_get_asciiparam(req, "physpath");
for (i = 0; i < *nargs; i++) {
snprintf(param, sizeof(param), "arg%d", i);
name = gctl_get_asciiparam(req, param);
if (name == NULL) {
gctl_error(req, "No 'arg%d' argument", i);
return;
}
if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
name += strlen("/dev/");
pp = g_provider_by_name(name);
if (pp == NULL) {
G_NOP_DEBUG(1, "Provider %s is invalid.", name);
gctl_error(req, "Provider %s is invalid.", name);
return;
}
if (g_nop_create(req, mp, pp,
*error == -1 ? EIO : (int)*error,
*rfailprob == -1 ? 0 : (u_int)*rfailprob,
*wfailprob == -1 ? 0 : (u_int)*wfailprob,
(off_t)*offset, (off_t)*size, (u_int)*secsize,
(off_t)*stripesize, (off_t)*stripeoffset,
physpath) != 0) {
return;
}
}
}
static void
g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp)
{
struct g_nop_softc *sc;
struct g_provider *pp;
intmax_t *error, *rfailprob, *wfailprob;
const char *name;
char param[16];
int i, *nargs;
g_topology_assert();
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
if (nargs == NULL) {
gctl_error(req, "No '%s' argument", "nargs");
return;
}
if (*nargs <= 0) {
gctl_error(req, "Missing device(s).");
return;
}
error = gctl_get_paraml(req, "error", sizeof(*error));
if (error == NULL) {
gctl_error(req, "No '%s' argument", "error");
return;
}
rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob));
if (rfailprob == NULL) {
gctl_error(req, "No '%s' argument", "rfailprob");
return;
}
if (*rfailprob < -1 || *rfailprob > 100) {
gctl_error(req, "Invalid '%s' argument", "rfailprob");
return;
}
wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob));
if (wfailprob == NULL) {
gctl_error(req, "No '%s' argument", "wfailprob");
return;
}
if (*wfailprob < -1 || *wfailprob > 100) {
gctl_error(req, "Invalid '%s' argument", "wfailprob");
return;
}
for (i = 0; i < *nargs; i++) {
snprintf(param, sizeof(param), "arg%d", i);
name = gctl_get_asciiparam(req, param);
if (name == NULL) {
gctl_error(req, "No 'arg%d' argument", i);
return;
}
if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
name += strlen("/dev/");
pp = g_provider_by_name(name);
if (pp == NULL || pp->geom->class != mp) {
G_NOP_DEBUG(1, "Provider %s is invalid.", name);
gctl_error(req, "Provider %s is invalid.", name);
return;
}
sc = pp->geom->softc;
if (*error != -1)
sc->sc_error = (int)*error;
if (*rfailprob != -1)
sc->sc_rfailprob = (u_int)*rfailprob;
if (*wfailprob != -1)
sc->sc_wfailprob = (u_int)*wfailprob;
}
}
static struct g_geom *
g_nop_find_geom(struct g_class *mp, const char *name)
{
struct g_geom *gp;
LIST_FOREACH(gp, &mp->geom, geom) {
if (strcmp(gp->name, name) == 0)
return (gp);
}
return (NULL);
}
static void
g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp)
{
int *nargs, *force, error, i;
struct g_geom *gp;
const char *name;
char param[16];
g_topology_assert();
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
if (nargs == NULL) {
gctl_error(req, "No '%s' argument", "nargs");
return;
}
if (*nargs <= 0) {
gctl_error(req, "Missing device(s).");
return;
}
force = gctl_get_paraml(req, "force", sizeof(*force));
if (force == NULL) {
gctl_error(req, "No 'force' argument");
return;
}
for (i = 0; i < *nargs; i++) {
snprintf(param, sizeof(param), "arg%d", i);
name = gctl_get_asciiparam(req, param);
if (name == NULL) {
gctl_error(req, "No 'arg%d' argument", i);
return;
}
if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
name += strlen("/dev/");
gp = g_nop_find_geom(mp, name);
if (gp == NULL) {
G_NOP_DEBUG(1, "Device %s is invalid.", name);
gctl_error(req, "Device %s is invalid.", name);
return;
}
error = g_nop_destroy(gp, *force);
if (error != 0) {
gctl_error(req, "Cannot destroy device %s (error=%d).",
gp->name, error);
return;
}
}
}
static void
g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp)
{
struct g_nop_softc *sc;
struct g_provider *pp;
const char *name;
char param[16];
int i, *nargs;
g_topology_assert();
nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
if (nargs == NULL) {
gctl_error(req, "No '%s' argument", "nargs");
return;
}
if (*nargs <= 0) {
gctl_error(req, "Missing device(s).");
return;
}
for (i = 0; i < *nargs; i++) {
snprintf(param, sizeof(param), "arg%d", i);
name = gctl_get_asciiparam(req, param);
if (name == NULL) {
gctl_error(req, "No 'arg%d' argument", i);
return;
}
if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
name += strlen("/dev/");
pp = g_provider_by_name(name);
if (pp == NULL || pp->geom->class != mp) {
G_NOP_DEBUG(1, "Provider %s is invalid.", name);
gctl_error(req, "Provider %s is invalid.", name);
return;
}
sc = pp->geom->softc;
sc->sc_reads = 0;
sc->sc_writes = 0;
sc->sc_deletes = 0;
sc->sc_getattrs = 0;
sc->sc_flushes = 0;
sc->sc_cmd0s = 0;
sc->sc_cmd1s = 0;
sc->sc_cmd2s = 0;
sc->sc_readbytes = 0;
sc->sc_wrotebytes = 0;
}
}
static void
g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb)
{
uint32_t *version;
g_topology_assert();
version = gctl_get_paraml(req, "version", sizeof(*version));
if (version == NULL) {
gctl_error(req, "No '%s' argument.", "version");
return;
}
if (*version != G_NOP_VERSION) {
gctl_error(req, "Userland and kernel parts are out of sync.");
return;
}
if (strcmp(verb, "create") == 0) {
g_nop_ctl_create(req, mp);
return;
} else if (strcmp(verb, "configure") == 0) {
g_nop_ctl_configure(req, mp);
return;
} else if (strcmp(verb, "destroy") == 0) {
g_nop_ctl_destroy(req, mp);
return;
} else if (strcmp(verb, "reset") == 0) {
g_nop_ctl_reset(req, mp);
return;
}
gctl_error(req, "Unknown verb.");
}
static void
g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
struct g_consumer *cp, struct g_provider *pp)
{
struct g_nop_softc *sc;
if (pp != NULL || cp != NULL)
return;
sc = gp->softc;
sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent,
(intmax_t)sc->sc_offset);
sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent,
sc->sc_rfailprob);
sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent,
sc->sc_wfailprob);
sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error);
sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads);
sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes);
sbuf_printf(sb, "%s<Deletes>%ju</Deletes>\n", indent, sc->sc_deletes);
sbuf_printf(sb, "%s<Getattrs>%ju</Getattrs>\n", indent, sc->sc_getattrs);
sbuf_printf(sb, "%s<Flushes>%ju</Flushes>\n", indent, sc->sc_flushes);
sbuf_printf(sb, "%s<Cmd0s>%ju</Cmd0s>\n", indent, sc->sc_cmd0s);
sbuf_printf(sb, "%s<Cmd1s>%ju</Cmd1s>\n", indent, sc->sc_cmd1s);
sbuf_printf(sb, "%s<Cmd2s>%ju</Cmd2s>\n", indent, sc->sc_cmd2s);
sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent,
sc->sc_readbytes);
sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent,
sc->sc_wrotebytes);
}
DECLARE_GEOM_CLASS(g_nop_class, g_nop);
MODULE_VERSION(geom_nop, 0);
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