7ac40f5f59
branches: Initialize struct cdevsw using C99 sparse initializtion and remove all initializations to default values. This patch is automatically generated and has been tested by compiling LINT with all the fields in struct cdevsw in reverse order on alpha, sparc64 and i386. Approved by: re(scottl)
139 lines
3.5 KiB
C
139 lines
3.5 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 | M_WAITOK);
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TAILQ_INSERT_TAIL(&pagelist, spp, list);
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spp->stat = g_malloc(PAGE_SIZE, M_ZERO | M_WAITOK);
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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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.d_open = nullopen,
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.d_close = nullclose,
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.d_mmap = g_stat_mmap,
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.d_name = "g_stats",
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.d_maj = GEOM_MAJOR,
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};
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static int
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g_stat_mmap(dev_t dev, vm_offset_t offset, vm_offset_t *paddr, 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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*paddr = vtophys(spp->stat);
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return (0);
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}
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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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