191 lines
4.1 KiB
C
191 lines
4.1 KiB
C
/*-
|
|
* Copyright (c) 2003 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 <paths.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <libgeom.h>
|
|
|
|
#include <sys/mman.h>
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
|
|
#include <geom/geom_stats.h>
|
|
#if 0
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
#include <err.h>
|
|
#endif
|
|
|
|
/************************************************************/
|
|
static uint npages, pagesize, spp;
|
|
static int statsfd = -1;
|
|
static u_char *statp;
|
|
|
|
void
|
|
geom_stats_close(void)
|
|
{
|
|
if (statsfd == -1)
|
|
return;
|
|
munmap(statp, npages *pagesize);
|
|
statp = NULL;
|
|
close (statsfd);
|
|
statsfd = -1;
|
|
}
|
|
|
|
void
|
|
geom_stats_resync(void)
|
|
{
|
|
void *p;
|
|
|
|
if (statsfd == -1)
|
|
return;
|
|
for (;;) {
|
|
p = mmap(statp, (npages + 1) * pagesize,
|
|
PROT_READ, 0, statsfd, 0);
|
|
if (p == MAP_FAILED)
|
|
break;
|
|
else
|
|
statp = p;
|
|
npages++;
|
|
}
|
|
}
|
|
|
|
int
|
|
geom_stats_open(void)
|
|
{
|
|
int error;
|
|
void *p;
|
|
|
|
if (statsfd != -1)
|
|
return (EBUSY);
|
|
statsfd = open(_PATH_DEV GEOM_STATS_DEVICE, O_RDONLY);
|
|
if (statsfd < 0)
|
|
return (errno);
|
|
pagesize = getpagesize();
|
|
spp = pagesize / sizeof(struct g_stat);
|
|
p = mmap(NULL, pagesize, PROT_READ, 0, statsfd, 0);
|
|
if (p == MAP_FAILED) {
|
|
error = errno;
|
|
close(statsfd);
|
|
statsfd = -1;
|
|
errno = error;
|
|
return (error);
|
|
}
|
|
statp = p;
|
|
npages = 1;
|
|
geom_stats_resync();
|
|
return (0);
|
|
}
|
|
|
|
struct snapshot {
|
|
u_char *ptr;
|
|
uint pages;
|
|
uint pagesize;
|
|
uint perpage;
|
|
struct timespec time;
|
|
/* used by getnext: */
|
|
uint u, v;
|
|
};
|
|
|
|
void *
|
|
geom_stats_snapshot_get(void)
|
|
{
|
|
struct snapshot *sp;
|
|
|
|
sp = malloc(sizeof *sp);
|
|
if (sp == NULL)
|
|
return (NULL);
|
|
memset(sp, 0, sizeof *sp);
|
|
sp->ptr = malloc(pagesize * npages);
|
|
if (sp->ptr == NULL) {
|
|
free(sp);
|
|
return (NULL);
|
|
}
|
|
memset(sp->ptr, 0, pagesize * npages); /* page in, cache */
|
|
clock_gettime(CLOCK_REALTIME, &sp->time);
|
|
memset(sp->ptr, 0, pagesize * npages); /* page in, cache */
|
|
memcpy(sp->ptr, statp, pagesize * npages);
|
|
sp->pages = npages;
|
|
sp->perpage = spp;
|
|
sp->pagesize = pagesize;
|
|
return (sp);
|
|
}
|
|
|
|
void
|
|
geom_stats_snapshot_free(void *arg)
|
|
{
|
|
struct snapshot *sp;
|
|
|
|
sp = arg;
|
|
free(sp->ptr);
|
|
free(sp);
|
|
}
|
|
|
|
void
|
|
geom_stats_snapshot_timestamp(void *arg, struct timespec *tp)
|
|
{
|
|
struct snapshot *sp;
|
|
|
|
sp = arg;
|
|
*tp = sp->time;
|
|
}
|
|
|
|
void
|
|
geom_stats_snapshot_reset(void *arg)
|
|
{
|
|
struct snapshot *sp;
|
|
|
|
sp = arg;
|
|
sp->u = sp->v = 0;
|
|
}
|
|
|
|
struct g_stat *
|
|
geom_stats_snapshot_next(void *arg)
|
|
{
|
|
struct g_stat *gsp;
|
|
struct snapshot *sp;
|
|
|
|
sp = arg;
|
|
gsp = (struct g_stat *)
|
|
(sp->ptr + sp->u * pagesize + sp->v * sizeof *gsp);
|
|
if (++sp->v >= sp->perpage) {
|
|
if (++sp->u >= sp->pages)
|
|
return (NULL);
|
|
else
|
|
sp->v = 0;
|
|
}
|
|
return (gsp);
|
|
}
|