2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2003 Poul-Henning Kamp
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The names of the authors may not be used to endorse or promote
16 * products derived from this software without specific prior written
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/types.h>
35 #include <sys/devicestat.h>
46 /************************************************************/
47 static uint npages, spp;
48 static int pagesize, statsfd = -1;
52 geom_stats_close(void)
56 munmap(statp, npages *pagesize);
63 geom_stats_resync(void)
70 p = mmap(statp, (npages + 1) * pagesize,
71 PROT_READ, MAP_SHARED, statsfd, 0);
88 statsfd = open(_PATH_DEV DEVSTAT_DEVICE_NAME, O_RDONLY);
91 pagesize = getpagesize();
92 spp = pagesize / sizeof(struct devstat);
93 p = mmap(NULL, pagesize, PROT_READ, MAP_SHARED, statsfd, 0);
94 if (p == MAP_FAILED) {
112 struct timespec time;
113 /* used by getnext: */
118 geom_stats_snapshot_get(void)
122 sp = malloc(sizeof *sp);
125 memset(sp, 0, sizeof *sp);
126 sp->ptr = malloc(pagesize * npages);
127 if (sp->ptr == NULL) {
131 memset(sp->ptr, 0, pagesize * npages); /* page in, cache */
132 clock_gettime(CLOCK_REALTIME, &sp->time);
133 memset(sp->ptr, 0, pagesize * npages); /* page in, cache */
134 memcpy(sp->ptr, statp, pagesize * npages);
137 sp->pagesize = pagesize;
142 geom_stats_snapshot_free(void *arg)
152 geom_stats_snapshot_timestamp(void *arg, struct timespec *tp)
161 geom_stats_snapshot_reset(void *arg)
170 geom_stats_snapshot_next(void *arg)
176 gsp = (struct devstat *)
177 (sp->ptr + sp->u * pagesize + sp->v * sizeof *gsp);
178 if (++sp->v >= sp->perpage) {
179 if (++sp->u >= sp->pages)