145 lines
3.6 KiB
C
145 lines
3.6 KiB
C
/*-
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* Copyright (c) 2002 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 "opt_geom.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/bio.h>
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#include <sys/conf.h>
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#include <sys/disk.h>
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#include <sys/malloc.h>
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#include <sys/sysctl.h>
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#include <sys/stdint.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <geom/geom.h>
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#include <geom/geom_int.h>
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#include <geom/geom_stats.h>
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#define statsperpage (PAGE_SIZE / sizeof(struct g_stat))
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struct statspage {
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TAILQ_ENTRY(statspage) list;
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struct g_stat *stat;
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u_int nfree;
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};
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static TAILQ_HEAD(, statspage) pagelist = TAILQ_HEAD_INITIALIZER(pagelist);
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struct g_stat *
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g_stat_new(void *id)
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{
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struct g_stat *gsp;
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struct statspage *spp;
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u_int u;
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g_topology_assert();
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TAILQ_FOREACH(spp, &pagelist, list) {
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if (spp->nfree > 0)
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break;
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}
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if (spp == NULL) {
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spp = g_malloc(sizeof *spp, M_ZERO);
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TAILQ_INSERT_TAIL(&pagelist, spp, list);
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spp->stat = g_malloc(PAGE_SIZE, M_ZERO);
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spp->nfree = statsperpage;
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}
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gsp = spp->stat;
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for (u = 0; u < statsperpage; u++) {
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if (gsp->id == NULL)
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break;
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gsp++;
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}
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spp->nfree--;
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gsp->id = id;
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return (gsp);
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}
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void
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g_stat_delete(struct g_stat *gsp)
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{
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struct statspage *spp;
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bzero(gsp, sizeof *gsp);
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TAILQ_FOREACH(spp, &pagelist, list) {
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if (gsp >= spp->stat && gsp < (spp->stat + statsperpage)) {
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spp->nfree++;
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return;
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}
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}
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}
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static d_mmap_t g_stat_mmap;
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static struct cdevsw geom_stats_cdevsw = {
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/* open */ nullopen,
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/* close */ nullclose,
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/* read */ noread,
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/* write */ nowrite,
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/* ioctl */ noioctl,
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/* poll */ nopoll,
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/* mmap */ g_stat_mmap,
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/* strtegy */ nostrategy,
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/* name */ "g_stats",
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/* maj */ GEOM_MAJOR,
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/* dump */ nodump,
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/* psize */ nopsize,
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/* flags */ 0,
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};
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static int
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g_stat_mmap(dev_t dev, vm_offset_t offset, int nprot)
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{
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struct statspage *spp;
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if (nprot != VM_PROT_READ)
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return (-1);
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TAILQ_FOREACH(spp, &pagelist, list) {
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if (offset == 0)
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return (vtophys(spp->stat) >> PAGE_SHIFT);
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offset -= PAGE_SIZE;
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}
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return (-1);
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}
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void
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g_stat_init(void)
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{
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make_dev(&geom_stats_cdevsw, GEOM_MINOR_STATS,
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UID_ROOT, GID_WHEEL, 0400, GEOM_STATS_DEVICE);
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}
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