5e53a4f90f
Mainly focus on files that use BSD 2-Clause license, however the tool I was using mis-identified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
186 lines
4.1 KiB
C
186 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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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 <sys/types.h>
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#include <sys/devicestat.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <paths.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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/************************************************************/
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static uint npages, spp;
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static int pagesize, 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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