diff options
Diffstat (limited to 'sys/geom/geom_stats.c')
| -rw-r--r-- | sys/geom/geom_stats.c | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/sys/geom/geom_stats.c b/sys/geom/geom_stats.c new file mode 100644 index 0000000..f93be80 --- /dev/null +++ b/sys/geom/geom_stats.c @@ -0,0 +1,145 @@ +/*- + * Copyright (c) 2002 Poul-Henning Kamp + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The names of the authors may not be used to endorse or promote + * products derived from this software without specific prior written + * permission. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include "opt_geom.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/sysctl.h> +#include <sys/bio.h> +#include <sys/conf.h> +#include <sys/disk.h> +#include <sys/malloc.h> +#include <sys/sysctl.h> +#include <sys/stdint.h> +#include <vm/vm.h> +#include <vm/pmap.h> + +#include <sys/lock.h> +#include <sys/mutex.h> +#include <geom/geom.h> +#include <geom/geom_int.h> +#include <geom/geom_stats.h> + +#define statsperpage (PAGE_SIZE / sizeof(struct g_stat)) + +struct statspage { + TAILQ_ENTRY(statspage) list; + struct g_stat *stat; + u_int nfree; +}; + +static TAILQ_HEAD(, statspage) pagelist = TAILQ_HEAD_INITIALIZER(pagelist); + +struct g_stat * +g_stat_new(void *id) +{ + struct g_stat *gsp; + struct statspage *spp; + u_int u; + + g_topology_assert(); + TAILQ_FOREACH(spp, &pagelist, list) { + if (spp->nfree > 0) + break; + } + if (spp == NULL) { + spp = g_malloc(sizeof *spp, M_ZERO); + TAILQ_INSERT_TAIL(&pagelist, spp, list); + spp->stat = g_malloc(PAGE_SIZE, M_ZERO); + printf("allocate another stats-page %p\n", spp->stat); + spp->nfree = statsperpage; + } + gsp = spp->stat; + for (u = 0; u < statsperpage; u++) { + if (gsp->id == NULL) + break; + gsp++; + } + spp->nfree--; + gsp->id = id; + return (gsp); +} + +void +g_stat_delete(struct g_stat *gsp) +{ + struct statspage *spp; + + bzero(gsp, sizeof *gsp); + TAILQ_FOREACH(spp, &pagelist, list) { + if (gsp >= spp->stat && gsp < (spp->stat + statsperpage)) { + spp->nfree++; + return; + } + } +} + +static d_mmap_t g_stat_mmap; + +static struct cdevsw geom_stats_cdevsw = { + /* open */ nullopen, + /* close */ nullclose, + /* read */ noread, + /* write */ nowrite, + /* ioctl */ noioctl, + /* poll */ nopoll, + /* mmap */ g_stat_mmap, + /* strtegy */ nostrategy, + /* name */ "g_stats", + /* maj */ GEOM_MAJOR, + /* dump */ nodump, + /* psize */ nopsize, + /* flags */ 0, +}; + +static int +g_stat_mmap(dev_t dev, vm_offset_t offset, int nprot) +{ + struct statspage *spp; + + if (nprot != VM_PROT_READ) + return (-1); + TAILQ_FOREACH(spp, &pagelist, list) { + if (offset == 0) + return (vtophys(spp->stat) >> PAGE_SHIFT); + offset -= PAGE_SIZE; + } + return (-1); +} + +void +g_stat_init(void) +{ + make_dev(&geom_stats_cdevsw, GEOM_MINOR_STATS, + UID_ROOT, GID_WHEEL, 0400, "geom.stats"); +} |
