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/*-
* Copyright (c) 2006 Ruslan Ermilov <ru@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 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: release/9.1.0/sys/geom/cache/g_cache.c 223921 2011-07-11 05:22:31Z ae $");
#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/sysctl.h>
#include <sys/malloc.h>
#include <sys/queue.h>
#include <sys/sbuf.h>
#include <sys/time.h>
#include <vm/uma.h>
#include <geom/geom.h>
#include <geom/cache/g_cache.h>
FEATURE(geom_cache, "GEOM cache module");
static MALLOC_DEFINE(M_GCACHE, "gcache_data", "GEOM_CACHE Data");
SYSCTL_DECL(_kern_geom);
SYSCTL_NODE(_kern_geom, OID_AUTO, cache, CTLFLAG_RW, 0, "GEOM_CACHE stuff");
static u_int g_cache_debug = 0;
SYSCTL_UINT(_kern_geom_cache, OID_AUTO, debug, CTLFLAG_RW, &g_cache_debug, 0,
"Debug level");
static u_int g_cache_enable = 1;
SYSCTL_UINT(_kern_geom_cache, OID_AUTO, enable, CTLFLAG_RW, &g_cache_enable, 0,
"");
static u_int g_cache_timeout = 10;
SYSCTL_UINT(_kern_geom_cache, OID_AUTO, timeout, CTLFLAG_RW, &g_cache_timeout,
0, "");
static u_int g_cache_idletime = 5;
SYSCTL_UINT(_kern_geom_cache, OID_AUTO, idletime, CTLFLAG_RW, &g_cache_idletime,
0, "");
static u_int g_cache_used_lo = 5;
static u_int g_cache_used_hi = 20;
static int
sysctl_handle_pct(SYSCTL_HANDLER_ARGS)
{
u_int val = *(u_int *)arg1;
int error;
error = sysctl_handle_int(oidp, &val, 0, req);
if (error || !req->newptr)
return (error);
if (val < 0 || val > 100)
return (EINVAL);
if ((arg1 == &g_cache_used_lo && val > g_cache_used_hi) ||
(arg1 == &g_cache_used_hi && g_cache_used_lo > val))
return (EINVAL);
*(u_int *)arg1 = val;
return (0);
}
SYSCTL_PROC(_kern_geom_cache, OID_AUTO, used_lo, CTLTYPE_UINT|CTLFLAG_RW,
&g_cache_used_lo, 0, sysctl_handle_pct, "IU", "");
SYSCTL_PROC(_kern_geom_cache, OID_AUTO, used_hi, CTLTYPE_UINT|CTLFLAG_RW,
&g_cache_used_hi, 0, sysctl_handle_pct, "IU", "");
static int g_cache_destroy(struct g_cache_softc *sc, boolean_t force);
static g_ctl_destroy_geom_t g_cache_destroy_geom;
static g_taste_t g_cache_taste;
static g_ctl_req_t g_cache_config;
static g_dumpconf_t g_cache_dumpconf;
struct g_class g_cache_class = {
.name = G_CACHE_CLASS_NAME,
.version = G_VERSION,
.ctlreq = g_cache_config,
.taste = g_cache_taste,
.destroy_geom = g_cache_destroy_geom
};
#define OFF2BNO(off, sc) ((off) >> (sc)->sc_bshift)
#define BNO2OFF(bno, sc) ((bno) << (sc)->sc_bshift)
static struct g_cache_desc *
g_cache_alloc(struct g_cache_softc *sc)
{
struct g_cache_desc *dp;
mtx_assert(&sc->sc_mtx, MA_OWNED);
if (!TAILQ_EMPTY(&sc->sc_usedlist)) {
dp = TAILQ_FIRST(&sc->sc_usedlist);
TAILQ_REMOVE(&sc->sc_usedlist, dp, d_used);
sc->sc_nused--;
dp->d_flags = 0;
LIST_REMOVE(dp, d_next);
return (dp);
}
if (sc->sc_nent > sc->sc_maxent) {
sc->sc_cachefull++;
return (NULL);
}
dp = malloc(sizeof(*dp), M_GCACHE, M_NOWAIT | M_ZERO);
if (dp == NULL)
return (NULL);
dp->d_data = uma_zalloc(sc->sc_zone, M_NOWAIT);
if (dp->d_data == NULL) {
free(dp, M_GCACHE);
return (NULL);
}
sc->sc_nent++;
return (dp);
}
static void
g_cache_free(struct g_cache_softc *sc, struct g_cache_desc *dp)
{
mtx_assert(&sc->sc_mtx, MA_OWNED);
uma_zfree(sc->sc_zone, dp->d_data);
free(dp, M_GCACHE);
sc->sc_nent--;
}
static void
g_cache_free_used(struct g_cache_softc *sc)
{
struct g_cache_desc *dp;
u_int n;
mtx_assert(&sc->sc_mtx, MA_OWNED);
n = g_cache_used_lo * sc->sc_maxent / 100;
while (sc->sc_nused > n) {
KASSERT(!TAILQ_EMPTY(&sc->sc_usedlist), ("used list empty"));
dp = TAILQ_FIRST(&sc->sc_usedlist);
TAILQ_REMOVE(&sc->sc_usedlist, dp, d_used);
sc->sc_nused--;
LIST_REMOVE(dp, d_next);
g_cache_free(sc, dp);
}
}
static void
g_cache_deliver(struct g_cache_softc *sc, struct bio *bp,
struct g_cache_desc *dp, int error)
{
off_t off1, off, len;
mtx_assert(&sc->sc_mtx, MA_OWNED);
KASSERT(OFF2BNO(bp->bio_offset, sc) <= dp->d_bno, ("wrong entry"));
KASSERT(OFF2BNO(bp->bio_offset + bp->bio_length - 1, sc) >=
dp->d_bno, ("wrong entry"));
off1 = BNO2OFF(dp->d_bno, sc);
off = MAX(bp->bio_offset, off1);
len = MIN(bp->bio_offset + bp->bio_length, off1 + sc->sc_bsize) - off;
if (bp->bio_error == 0)
bp->bio_error = error;
if (bp->bio_error == 0) {
bcopy(dp->d_data + (off - off1),
bp->bio_data + (off - bp->bio_offset), len);
}
bp->bio_completed += len;
KASSERT(bp->bio_completed <= bp->bio_length, ("extra data"));
if (bp->bio_completed == bp->bio_length) {
if (bp->bio_error != 0)
bp->bio_completed = 0;
g_io_deliver(bp, bp->bio_error);
}
if (dp->d_flags & D_FLAG_USED) {
TAILQ_REMOVE(&sc->sc_usedlist, dp, d_used);
TAILQ_INSERT_TAIL(&sc->sc_usedlist, dp, d_used);
} else if (OFF2BNO(off + len, sc) > dp->d_bno) {
TAILQ_INSERT_TAIL(&sc->sc_usedlist, dp, d_used);
sc->sc_nused++;
dp->d_flags |= D_FLAG_USED;
}
dp->d_atime = time_uptime;
}
static void
g_cache_done(struct bio *bp)
{
struct g_cache_softc *sc;
struct g_cache_desc *dp;
struct bio *bp2, *tmpbp;
sc = bp->bio_from->geom->softc;
KASSERT(G_CACHE_DESC1(bp) == sc, ("corrupt bio_caller in g_cache_done()"));
dp = G_CACHE_DESC2(bp);
mtx_lock(&sc->sc_mtx);
bp2 = dp->d_biolist;
while (bp2 != NULL) {
KASSERT(G_CACHE_NEXT_BIO1(bp2) == sc, ("corrupt bio_driver in g_cache_done()"));
tmpbp = G_CACHE_NEXT_BIO2(bp2);
g_cache_deliver(sc, bp2, dp, bp->bio_error);
bp2 = tmpbp;
}
dp->d_biolist = NULL;
if (dp->d_flags & D_FLAG_INVALID) {
sc->sc_invalid--;
g_cache_free(sc, dp);
} else if (bp->bio_error) {
LIST_REMOVE(dp, d_next);
if (dp->d_flags & D_FLAG_USED) {
TAILQ_REMOVE(&sc->sc_usedlist, dp, d_used);
sc->sc_nused--;
}
g_cache_free(sc, dp);
}
mtx_unlock(&sc->sc_mtx);
g_destroy_bio(bp);
}
static struct g_cache_desc *
g_cache_lookup(struct g_cache_softc *sc, off_t bno)
{
struct g_cache_desc *dp;
mtx_assert(&sc->sc_mtx, MA_OWNED);
LIST_FOREACH(dp, &sc->sc_desclist[G_CACHE_BUCKET(bno)], d_next)
if (dp->d_bno == bno)
return (dp);
return (NULL);
}
static int
g_cache_read(struct g_cache_softc *sc, struct bio *bp)
{
struct bio *cbp;
struct g_cache_desc *dp;
mtx_lock(&sc->sc_mtx);
dp = g_cache_lookup(sc,
OFF2BNO(bp->bio_offset + bp->bio_completed, sc));
if (dp != NULL) {
/* Add to waiters list or deliver. */
sc->sc_cachehits++;
if (dp->d_biolist != NULL) {
G_CACHE_NEXT_BIO1(bp) = sc;
G_CACHE_NEXT_BIO2(bp) = dp->d_biolist;
dp->d_biolist = bp;
} else
g_cache_deliver(sc, bp, dp, 0);
mtx_unlock(&sc->sc_mtx);
return (0);
}
/* Cache miss. Allocate entry and schedule bio. */
sc->sc_cachemisses++;
dp = g_cache_alloc(sc);
if (dp == NULL) {
mtx_unlock(&sc->sc_mtx);
return (ENOMEM);
}
cbp = g_clone_bio(bp);
if (cbp == NULL) {
g_cache_free(sc, dp);
mtx_unlock(&sc->sc_mtx);
return (ENOMEM);
}
dp->d_bno = OFF2BNO(bp->bio_offset + bp->bio_completed, sc);
G_CACHE_NEXT_BIO1(bp) = sc;
G_CACHE_NEXT_BIO2(bp) = NULL;
dp->d_biolist = bp;
LIST_INSERT_HEAD(&sc->sc_desclist[G_CACHE_BUCKET(dp->d_bno)],
dp, d_next);
mtx_unlock(&sc->sc_mtx);
G_CACHE_DESC1(cbp) = sc;
G_CACHE_DESC2(cbp) = dp;
cbp->bio_done = g_cache_done;
cbp->bio_offset = BNO2OFF(dp->d_bno, sc);
cbp->bio_data = dp->d_data;
cbp->bio_length = sc->sc_bsize;
g_io_request(cbp, LIST_FIRST(&bp->bio_to->geom->consumer));
return (0);
}
static void
g_cache_invalidate(struct g_cache_softc *sc, struct bio *bp)
{
struct g_cache_desc *dp;
off_t bno, lim;
mtx_lock(&sc->sc_mtx);
bno = OFF2BNO(bp->bio_offset, sc);
lim = OFF2BNO(bp->bio_offset + bp->bio_length - 1, sc);
do {
if ((dp = g_cache_lookup(sc, bno)) != NULL) {
LIST_REMOVE(dp, d_next);
if (dp->d_flags & D_FLAG_USED) {
TAILQ_REMOVE(&sc->sc_usedlist, dp, d_used);
sc->sc_nused--;
}
if (dp->d_biolist == NULL)
g_cache_free(sc, dp);
else {
dp->d_flags = D_FLAG_INVALID;
sc->sc_invalid++;
}
}
bno++;
} while (bno <= lim);
mtx_unlock(&sc->sc_mtx);
}
static void
g_cache_start(struct bio *bp)
{
struct g_cache_softc *sc;
struct g_geom *gp;
struct g_cache_desc *dp;
struct bio *cbp;
gp = bp->bio_to->geom;
sc = gp->softc;
G_CACHE_LOGREQ(bp, "Request received.");
switch (bp->bio_cmd) {
case BIO_READ:
sc->sc_reads++;
sc->sc_readbytes += bp->bio_length;
if (!g_cache_enable)
break;
if (bp->bio_offset + bp->bio_length > sc->sc_tail)
break;
if (OFF2BNO(bp->bio_offset, sc) ==
OFF2BNO(bp->bio_offset + bp->bio_length - 1, sc)) {
sc->sc_cachereads++;
sc->sc_cachereadbytes += bp->bio_length;
if (g_cache_read(sc, bp) == 0)
return;
sc->sc_cachereads--;
sc->sc_cachereadbytes -= bp->bio_length;
break;
} else if (OFF2BNO(bp->bio_offset, sc) + 1 ==
OFF2BNO(bp->bio_offset + bp->bio_length - 1, sc)) {
mtx_lock(&sc->sc_mtx);
dp = g_cache_lookup(sc, OFF2BNO(bp->bio_offset, sc));
if (dp == NULL || dp->d_biolist != NULL) {
mtx_unlock(&sc->sc_mtx);
break;
}
sc->sc_cachereads++;
sc->sc_cachereadbytes += bp->bio_length;
g_cache_deliver(sc, bp, dp, 0);
mtx_unlock(&sc->sc_mtx);
if (g_cache_read(sc, bp) == 0)
return;
sc->sc_cachereads--;
sc->sc_cachereadbytes -= bp->bio_length;
break;
}
break;
case BIO_WRITE:
sc->sc_writes++;
sc->sc_wrotebytes += bp->bio_length;
g_cache_invalidate(sc, bp);
break;
}
cbp = g_clone_bio(bp);
if (cbp == NULL) {
g_io_deliver(bp, ENOMEM);
return;
}
cbp->bio_done = g_std_done;
G_CACHE_LOGREQ(cbp, "Sending request.");
g_io_request(cbp, LIST_FIRST(&gp->consumer));
}
static void
g_cache_go(void *arg)
{
struct g_cache_softc *sc = arg;
struct g_cache_desc *dp;
int i;
mtx_assert(&sc->sc_mtx, MA_OWNED);
/* Forcibly mark idle ready entries as used. */
for (i = 0; i < G_CACHE_BUCKETS; i++) {
LIST_FOREACH(dp, &sc->sc_desclist[i], d_next) {
if (dp->d_flags & D_FLAG_USED ||
dp->d_biolist != NULL ||
time_uptime - dp->d_atime < g_cache_idletime)
continue;
TAILQ_INSERT_TAIL(&sc->sc_usedlist, dp, d_used);
sc->sc_nused++;
dp->d_flags |= D_FLAG_USED;
}
}
/* Keep the number of used entries low. */
if (sc->sc_nused > g_cache_used_hi * sc->sc_maxent / 100)
g_cache_free_used(sc);
callout_reset(&sc->sc_callout, g_cache_timeout * hz, g_cache_go, sc);
}
static int
g_cache_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 void
g_cache_orphan(struct g_consumer *cp)
{
g_topology_assert();
g_cache_destroy(cp->geom->softc, 1);
}
static struct g_cache_softc *
g_cache_find_device(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->softc);
}
return (NULL);
}
static struct g_geom *
g_cache_create(struct g_class *mp, struct g_provider *pp,
const struct g_cache_metadata *md, u_int type)
{
struct g_cache_softc *sc;
struct g_geom *gp;
struct g_provider *newpp;
struct g_consumer *cp;
u_int bshift;
int i;
g_topology_assert();
gp = NULL;
newpp = NULL;
cp = NULL;
G_CACHE_DEBUG(1, "Creating device %s.", md->md_name);
/* Cache size is minimum 100. */
if (md->md_size < 100) {
G_CACHE_DEBUG(0, "Invalid size for device %s.", md->md_name);
return (NULL);
}
/* Block size restrictions. */
bshift = ffs(md->md_bsize) - 1;
if (md->md_bsize == 0 || md->md_bsize > MAXPHYS ||
md->md_bsize != 1 << bshift ||
(md->md_bsize % pp->sectorsize) != 0) {
G_CACHE_DEBUG(0, "Invalid blocksize for provider %s.", pp->name);
return (NULL);
}
/* Check for duplicate unit. */
if (g_cache_find_device(mp, (const char *)&md->md_name) != NULL) {
G_CACHE_DEBUG(0, "Provider %s already exists.", md->md_name);
return (NULL);
}
gp = g_new_geomf(mp, md->md_name);
sc = g_malloc(sizeof(*sc), M_WAITOK | M_ZERO);
sc->sc_type = type;
sc->sc_bshift = bshift;
sc->sc_bsize = 1 << bshift;
sc->sc_zone = uma_zcreate("gcache", sc->sc_bsize, NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, 0);
mtx_init(&sc->sc_mtx, "GEOM CACHE mutex", NULL, MTX_DEF);
for (i = 0; i < G_CACHE_BUCKETS; i++)
LIST_INIT(&sc->sc_desclist[i]);
TAILQ_INIT(&sc->sc_usedlist);
sc->sc_maxent = md->md_size;
callout_init_mtx(&sc->sc_callout, &sc->sc_mtx, 0);
gp->softc = sc;
sc->sc_geom = gp;
gp->start = g_cache_start;
gp->orphan = g_cache_orphan;
gp->access = g_cache_access;
gp->dumpconf = g_cache_dumpconf;
newpp = g_new_providerf(gp, "cache/%s", gp->name);
newpp->sectorsize = pp->sectorsize;
newpp->mediasize = pp->mediasize;
if (type == G_CACHE_TYPE_AUTOMATIC)
newpp->mediasize -= pp->sectorsize;
sc->sc_tail = BNO2OFF(OFF2BNO(newpp->mediasize, sc), sc);
cp = g_new_consumer(gp);
if (g_attach(cp, pp) != 0) {
G_CACHE_DEBUG(0, "Cannot attach to provider %s.", pp->name);
g_destroy_consumer(cp);
g_destroy_provider(newpp);
mtx_destroy(&sc->sc_mtx);
g_free(sc);
g_destroy_geom(gp);
return (NULL);
}
g_error_provider(newpp, 0);
G_CACHE_DEBUG(0, "Device %s created.", gp->name);
callout_reset(&sc->sc_callout, g_cache_timeout * hz, g_cache_go, sc);
return (gp);
}
static int
g_cache_destroy(struct g_cache_softc *sc, boolean_t force)
{
struct g_geom *gp;
struct g_provider *pp;
struct g_cache_desc *dp, *dp2;
int i;
g_topology_assert();
if (sc == NULL)
return (ENXIO);
gp = sc->sc_geom;
pp = LIST_FIRST(&gp->provider);
if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
if (force) {
G_CACHE_DEBUG(0, "Device %s is still open, so it "
"can't be definitely removed.", pp->name);
} else {
G_CACHE_DEBUG(1, "Device %s is still open (r%dw%de%d).",
pp->name, pp->acr, pp->acw, pp->ace);
return (EBUSY);
}
} else {
G_CACHE_DEBUG(0, "Device %s removed.", gp->name);
}
callout_drain(&sc->sc_callout);
mtx_lock(&sc->sc_mtx);
for (i = 0; i < G_CACHE_BUCKETS; i++) {
dp = LIST_FIRST(&sc->sc_desclist[i]);
while (dp != NULL) {
dp2 = LIST_NEXT(dp, d_next);
g_cache_free(sc, dp);
dp = dp2;
}
}
mtx_unlock(&sc->sc_mtx);
mtx_destroy(&sc->sc_mtx);
uma_zdestroy(sc->sc_zone);
g_free(sc);
gp->softc = NULL;
g_wither_geom(gp, ENXIO);
return (0);
}
static int
g_cache_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
{
return (g_cache_destroy(gp->softc, 0));
}
static int
g_cache_read_metadata(struct g_consumer *cp, struct g_cache_metadata *md)
{
struct g_provider *pp;
u_char *buf;
int error;
g_topology_assert();
error = g_access(cp, 1, 0, 0);
if (error != 0)
return (error);
pp = cp->provider;
g_topology_unlock();
buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
&error);
g_topology_lock();
g_access(cp, -1, 0, 0);
if (buf == NULL)
return (error);
/* Decode metadata. */
cache_metadata_decode(buf, md);
g_free(buf);
return (0);
}
static int
g_cache_write_metadata(struct g_consumer *cp, struct g_cache_metadata *md)
{
struct g_provider *pp;
u_char *buf;
int error;
g_topology_assert();
error = g_access(cp, 0, 1, 0);
if (error != 0)
return (error);
pp = cp->provider;
buf = malloc((size_t)pp->sectorsize, M_GCACHE, M_WAITOK | M_ZERO);
cache_metadata_encode(md, buf);
g_topology_unlock();
error = g_write_data(cp, pp->mediasize - pp->sectorsize, buf, pp->sectorsize);
g_topology_lock();
g_access(cp, 0, -1, 0);
free(buf, M_GCACHE);
return (error);
}
static struct g_geom *
g_cache_taste(struct g_class *mp, struct g_provider *pp, int flags __unused)
{
struct g_cache_metadata md;
struct g_consumer *cp;
struct g_geom *gp;
int error;
g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
g_topology_assert();
G_CACHE_DEBUG(3, "Tasting %s.", pp->name);
gp = g_new_geomf(mp, "cache:taste");
gp->start = g_cache_start;
gp->orphan = g_cache_orphan;
gp->access = g_cache_access;
cp = g_new_consumer(gp);
g_attach(cp, pp);
error = g_cache_read_metadata(cp, &md);
g_detach(cp);
g_destroy_consumer(cp);
g_destroy_geom(gp);
if (error != 0)
return (NULL);
if (strcmp(md.md_magic, G_CACHE_MAGIC) != 0)
return (NULL);
if (md.md_version > G_CACHE_VERSION) {
printf("geom_cache.ko module is too old to handle %s.\n",
pp->name);
return (NULL);
}
if (md.md_provsize != pp->mediasize)
return (NULL);
gp = g_cache_create(mp, pp, &md, G_CACHE_TYPE_AUTOMATIC);
if (gp == NULL) {
G_CACHE_DEBUG(0, "Can't create %s.", md.md_name);
return (NULL);
}
return (gp);
}
static void
g_cache_ctl_create(struct gctl_req *req, struct g_class *mp)
{
struct g_cache_metadata md;
struct g_provider *pp;
struct g_geom *gp;
intmax_t *bsize, *size;
const char *name;
int *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 != 2) {
gctl_error(req, "Invalid number of arguments.");
return;
}
strlcpy(md.md_magic, G_CACHE_MAGIC, sizeof(md.md_magic));
md.md_version = G_CACHE_VERSION;
name = gctl_get_asciiparam(req, "arg0");
if (name == NULL) {
gctl_error(req, "No 'arg0' argument");
return;
}
strlcpy(md.md_name, name, sizeof(md.md_name));
size = gctl_get_paraml(req, "size", sizeof(*size));
if (size == NULL) {
gctl_error(req, "No '%s' argument", "size");
return;
}
if ((u_int)*size < 100) {
gctl_error(req, "Invalid '%s' argument", "size");
return;
}
md.md_size = (u_int)*size;
bsize = gctl_get_paraml(req, "blocksize", sizeof(*bsize));
if (bsize == NULL) {
gctl_error(req, "No '%s' argument", "blocksize");
return;
}
if (*bsize < 0) {
gctl_error(req, "Invalid '%s' argument", "blocksize");
return;
}
md.md_bsize = (u_int)*bsize;
/* This field is not important here. */
md.md_provsize = 0;
name = gctl_get_asciiparam(req, "arg1");
if (name == NULL) {
gctl_error(req, "No 'arg1' argument");
return;
}
if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
name += strlen("/dev/");
pp = g_provider_by_name(name);
if (pp == NULL) {
G_CACHE_DEBUG(1, "Provider %s is invalid.", name);
gctl_error(req, "Provider %s is invalid.", name);
return;
}
gp = g_cache_create(mp, pp, &md, G_CACHE_TYPE_MANUAL);
if (gp == NULL) {
gctl_error(req, "Can't create %s.", md.md_name);
return;
}
}
static void
g_cache_ctl_configure(struct gctl_req *req, struct g_class *mp)
{
struct g_cache_metadata md;
struct g_cache_softc *sc;
struct g_consumer *cp;
intmax_t *bsize, *size;
const char *name;
int error, *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 != 1) {
gctl_error(req, "Missing device.");
return;
}
name = gctl_get_asciiparam(req, "arg0");
if (name == NULL) {
gctl_error(req, "No 'arg0' argument");
return;
}
sc = g_cache_find_device(mp, name);
if (sc == NULL) {
G_CACHE_DEBUG(1, "Device %s is invalid.", name);
gctl_error(req, "Device %s is invalid.", name);
return;
}
size = gctl_get_paraml(req, "size", sizeof(*size));
if (size == NULL) {
gctl_error(req, "No '%s' argument", "size");
return;
}
if ((u_int)*size != 0 && (u_int)*size < 100) {
gctl_error(req, "Invalid '%s' argument", "size");
return;
}
if ((u_int)*size != 0)
sc->sc_maxent = (u_int)*size;
bsize = gctl_get_paraml(req, "blocksize", sizeof(*bsize));
if (bsize == NULL) {
gctl_error(req, "No '%s' argument", "blocksize");
return;
}
if (*bsize < 0) {
gctl_error(req, "Invalid '%s' argument", "blocksize");
return;
}
if (sc->sc_type != G_CACHE_TYPE_AUTOMATIC)
return;
strlcpy(md.md_name, name, sizeof(md.md_name));
strlcpy(md.md_magic, G_CACHE_MAGIC, sizeof(md.md_magic));
md.md_version = G_CACHE_VERSION;
if ((u_int)*size != 0)
md.md_size = (u_int)*size;
else
md.md_size = sc->sc_maxent;
if ((u_int)*bsize != 0)
md.md_bsize = (u_int)*bsize;
else
md.md_bsize = sc->sc_bsize;
cp = LIST_FIRST(&sc->sc_geom->consumer);
md.md_provsize = cp->provider->mediasize;
error = g_cache_write_metadata(cp, &md);
if (error == 0)
G_CACHE_DEBUG(2, "Metadata on %s updated.", cp->provider->name);
else
G_CACHE_DEBUG(0, "Cannot update metadata on %s (error=%d).",
cp->provider->name, error);
}
static void
g_cache_ctl_destroy(struct gctl_req *req, struct g_class *mp)
{
int *nargs, *force, error, i;
struct g_cache_softc *sc;
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;
}
sc = g_cache_find_device(mp, name);
if (sc == NULL) {
G_CACHE_DEBUG(1, "Device %s is invalid.", name);
gctl_error(req, "Device %s is invalid.", name);
return;
}
error = g_cache_destroy(sc, *force);
if (error != 0) {
gctl_error(req, "Cannot destroy device %s (error=%d).",
sc->sc_name, error);
return;
}
}
}
static void
g_cache_ctl_reset(struct gctl_req *req, struct g_class *mp)
{
struct g_cache_softc *sc;
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;
}
sc = g_cache_find_device(mp, name);
if (sc == NULL) {
G_CACHE_DEBUG(1, "Device %s is invalid.", name);
gctl_error(req, "Device %s is invalid.", name);
return;
}
sc->sc_reads = 0;
sc->sc_readbytes = 0;
sc->sc_cachereads = 0;
sc->sc_cachereadbytes = 0;
sc->sc_cachehits = 0;
sc->sc_cachemisses = 0;
sc->sc_cachefull = 0;
sc->sc_writes = 0;
sc->sc_wrotebytes = 0;
}
}
static void
g_cache_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_CACHE_VERSION) {
gctl_error(req, "Userland and kernel parts are out of sync.");
return;
}
if (strcmp(verb, "create") == 0) {
g_cache_ctl_create(req, mp);
return;
} else if (strcmp(verb, "configure") == 0) {
g_cache_ctl_configure(req, mp);
return;
} else if (strcmp(verb, "destroy") == 0 ||
strcmp(verb, "stop") == 0) {
g_cache_ctl_destroy(req, mp);
return;
} else if (strcmp(verb, "reset") == 0) {
g_cache_ctl_reset(req, mp);
return;
}
gctl_error(req, "Unknown verb.");
}
static void
g_cache_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
struct g_consumer *cp, struct g_provider *pp)
{
struct g_cache_softc *sc;
if (pp != NULL || cp != NULL)
return;
sc = gp->softc;
sbuf_printf(sb, "%s<Size>%u</Size>\n", indent, sc->sc_maxent);
sbuf_printf(sb, "%s<BlockSize>%u</BlockSize>\n", indent, sc->sc_bsize);
sbuf_printf(sb, "%s<TailOffset>%ju</TailOffset>\n", indent,
(uintmax_t)sc->sc_tail);
sbuf_printf(sb, "%s<Entries>%u</Entries>\n", indent, sc->sc_nent);
sbuf_printf(sb, "%s<UsedEntries>%u</UsedEntries>\n", indent,
sc->sc_nused);
sbuf_printf(sb, "%s<InvalidEntries>%u</InvalidEntries>\n", indent,
sc->sc_invalid);
sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads);
sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent,
sc->sc_readbytes);
sbuf_printf(sb, "%s<CacheReads>%ju</CacheReads>\n", indent,
sc->sc_cachereads);
sbuf_printf(sb, "%s<CacheReadBytes>%ju</CacheReadBytes>\n", indent,
sc->sc_cachereadbytes);
sbuf_printf(sb, "%s<CacheHits>%ju</CacheHits>\n", indent,
sc->sc_cachehits);
sbuf_printf(sb, "%s<CacheMisses>%ju</CacheMisses>\n", indent,
sc->sc_cachemisses);
sbuf_printf(sb, "%s<CacheFull>%ju</CacheFull>\n", indent,
sc->sc_cachefull);
sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes);
sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent,
sc->sc_wrotebytes);
}
DECLARE_GEOM_CLASS(g_cache_class, g_cache);