2 * Copyright (c) 2003 Poul-Henning Kamp
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. The names of the authors may not be used to endorse or promote
14 * products derived from this software without specific prior written
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/types.h>
33 #include <sys/devicestat.h>
44 /************************************************************/
45 static uint npages, spp;
46 static int pagesize, statsfd = -1;
50 geom_stats_close(void)
54 munmap(statp, npages *pagesize);
61 geom_stats_resync(void)
68 p = mmap(statp, (npages + 1) * pagesize,
69 PROT_READ, MAP_SHARED, statsfd, 0);
86 statsfd = open(_PATH_DEV DEVSTAT_DEVICE_NAME, O_RDONLY);
89 pagesize = getpagesize();
90 spp = pagesize / sizeof(struct devstat);
91 p = mmap(NULL, pagesize, PROT_READ, MAP_SHARED, statsfd, 0);
92 if (p == MAP_FAILED) {
110 struct timespec time;
111 /* used by getnext: */
116 geom_stats_snapshot_get(void)
120 sp = malloc(sizeof *sp);
123 memset(sp, 0, sizeof *sp);
124 sp->ptr = malloc(pagesize * npages);
125 if (sp->ptr == NULL) {
129 memset(sp->ptr, 0, pagesize * npages); /* page in, cache */
130 clock_gettime(CLOCK_REALTIME, &sp->time);
131 memset(sp->ptr, 0, pagesize * npages); /* page in, cache */
132 memcpy(sp->ptr, statp, pagesize * npages);
135 sp->pagesize = pagesize;
140 geom_stats_snapshot_free(void *arg)
150 geom_stats_snapshot_timestamp(void *arg, struct timespec *tp)
159 geom_stats_snapshot_reset(void *arg)
168 geom_stats_snapshot_next(void *arg)
174 gsp = (struct devstat *)
175 (sp->ptr + sp->u * pagesize + sp->v * sizeof *gsp);
176 if (++sp->v >= sp->perpage) {
177 if (++sp->u >= sp->pages)