147 lines
3.7 KiB
C
147 lines
3.7 KiB
C
/*-
|
|
* Copyright (c) 2002 Poul-Henning Kamp
|
|
* 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.
|
|
* 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.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#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/conf.h>
|
|
#include <sys/disk.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/stdint.h>
|
|
#include <vm/vm.h>
|
|
#include <vm/pmap.h>
|
|
|
|
#include <sys/lock.h>
|
|
#include <sys/mutex.h>
|
|
#include <geom/geom.h>
|
|
#include <geom/geom_int.h>
|
|
#include <geom/geom_stats.h>
|
|
|
|
#define statsperpage (PAGE_SIZE / sizeof(struct g_stat))
|
|
|
|
struct statspage {
|
|
TAILQ_ENTRY(statspage) list;
|
|
struct g_stat *stat;
|
|
u_int nfree;
|
|
};
|
|
|
|
static TAILQ_HEAD(, statspage) pagelist = TAILQ_HEAD_INITIALIZER(pagelist);
|
|
|
|
struct g_stat *
|
|
g_stat_new(void *id)
|
|
{
|
|
struct g_stat *gsp;
|
|
struct statspage *spp;
|
|
u_int u;
|
|
|
|
g_topology_assert();
|
|
TAILQ_FOREACH(spp, &pagelist, list) {
|
|
if (spp->nfree > 0)
|
|
break;
|
|
}
|
|
if (spp == NULL) {
|
|
spp = g_malloc(sizeof *spp, M_ZERO | M_WAITOK);
|
|
TAILQ_INSERT_TAIL(&pagelist, spp, list);
|
|
spp->stat = g_malloc(PAGE_SIZE, M_ZERO | M_WAITOK);
|
|
spp->nfree = statsperpage;
|
|
}
|
|
gsp = spp->stat;
|
|
for (u = 0; u < statsperpage; u++) {
|
|
if (gsp->id == NULL)
|
|
break;
|
|
gsp++;
|
|
}
|
|
spp->nfree--;
|
|
gsp->id = id;
|
|
return (gsp);
|
|
}
|
|
|
|
void
|
|
g_stat_delete(struct g_stat *gsp)
|
|
{
|
|
struct statspage *spp;
|
|
|
|
bzero(gsp, sizeof *gsp);
|
|
TAILQ_FOREACH(spp, &pagelist, list) {
|
|
if (gsp >= spp->stat && gsp < (spp->stat + statsperpage)) {
|
|
spp->nfree++;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static d_mmap_t g_stat_mmap;
|
|
|
|
static struct cdevsw geom_stats_cdevsw = {
|
|
/* open */ nullopen,
|
|
/* close */ nullclose,
|
|
/* read */ noread,
|
|
/* write */ nowrite,
|
|
/* ioctl */ noioctl,
|
|
/* poll */ nopoll,
|
|
/* mmap */ g_stat_mmap,
|
|
/* strtegy */ nostrategy,
|
|
/* name */ "g_stats",
|
|
/* maj */ GEOM_MAJOR,
|
|
/* dump */ nodump,
|
|
/* psize */ nopsize,
|
|
/* flags */ 0,
|
|
};
|
|
|
|
static int
|
|
g_stat_mmap(dev_t dev, vm_offset_t offset, vm_offset_t *paddr, int nprot)
|
|
{
|
|
struct statspage *spp;
|
|
|
|
if (nprot != VM_PROT_READ)
|
|
return (-1);
|
|
TAILQ_FOREACH(spp, &pagelist, list) {
|
|
if (offset == 0) {
|
|
*paddr = vtophys(spp->stat);
|
|
return (0);
|
|
}
|
|
offset -= PAGE_SIZE;
|
|
}
|
|
return (-1);
|
|
}
|
|
|
|
void
|
|
g_stat_init(void)
|
|
{
|
|
make_dev(&geom_stats_cdevsw, GEOM_MINOR_STATS,
|
|
UID_ROOT, GID_WHEEL, 0400, GEOM_STATS_DEVICE);
|
|
}
|