186 lines
4.0 KiB
C
186 lines
4.0 KiB
C
/*-
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* Copyright (c) 2003 Poul-Henning Kamp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <paths.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <libgeom.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/devicestat.h>
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/************************************************************/
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static uint npages, pagesize, spp;
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static int statsfd = -1;
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static u_char *statp;
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void
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geom_stats_close(void)
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{
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if (statsfd == -1)
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return;
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munmap(statp, npages *pagesize);
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statp = NULL;
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close (statsfd);
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statsfd = -1;
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}
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void
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geom_stats_resync(void)
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{
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void *p;
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if (statsfd == -1)
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return;
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for (;;) {
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p = mmap(statp, (npages + 1) * pagesize,
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PROT_READ, MAP_SHARED, statsfd, 0);
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if (p == MAP_FAILED)
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break;
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else
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statp = p;
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npages++;
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}
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}
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int
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geom_stats_open(void)
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{
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int error;
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void *p;
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if (statsfd != -1)
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return (EBUSY);
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statsfd = open(_PATH_DEV DEVSTAT_DEVICE_NAME, O_RDONLY);
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if (statsfd < 0)
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return (errno);
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pagesize = getpagesize();
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spp = pagesize / sizeof(struct devstat);
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p = mmap(NULL, pagesize, PROT_READ, MAP_SHARED, statsfd, 0);
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if (p == MAP_FAILED) {
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error = errno;
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close(statsfd);
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statsfd = -1;
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errno = error;
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return (error);
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}
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statp = p;
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npages = 1;
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geom_stats_resync();
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return (0);
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}
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struct snapshot {
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u_char *ptr;
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uint pages;
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uint pagesize;
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uint perpage;
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struct timespec time;
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/* used by getnext: */
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uint u, v;
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};
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void *
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geom_stats_snapshot_get(void)
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{
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struct snapshot *sp;
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sp = malloc(sizeof *sp);
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if (sp == NULL)
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return (NULL);
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memset(sp, 0, sizeof *sp);
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sp->ptr = malloc(pagesize * npages);
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if (sp->ptr == NULL) {
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free(sp);
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return (NULL);
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}
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memset(sp->ptr, 0, pagesize * npages); /* page in, cache */
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clock_gettime(CLOCK_REALTIME, &sp->time);
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memset(sp->ptr, 0, pagesize * npages); /* page in, cache */
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memcpy(sp->ptr, statp, pagesize * npages);
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sp->pages = npages;
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sp->perpage = spp;
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sp->pagesize = pagesize;
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return (sp);
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}
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void
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geom_stats_snapshot_free(void *arg)
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{
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struct snapshot *sp;
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sp = arg;
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free(sp->ptr);
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free(sp);
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}
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void
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geom_stats_snapshot_timestamp(void *arg, struct timespec *tp)
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{
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struct snapshot *sp;
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sp = arg;
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*tp = sp->time;
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}
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void
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geom_stats_snapshot_reset(void *arg)
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{
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struct snapshot *sp;
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sp = arg;
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sp->u = sp->v = 0;
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}
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struct devstat *
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geom_stats_snapshot_next(void *arg)
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{
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struct devstat *gsp;
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struct snapshot *sp;
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sp = arg;
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gsp = (struct devstat *)
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(sp->ptr + sp->u * pagesize + sp->v * sizeof *gsp);
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if (++sp->v >= sp->perpage) {
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if (++sp->u >= sp->pages)
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return (NULL);
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else
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sp->v = 0;
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}
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return (gsp);
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}
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