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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //compat/linux/proc/68247/cwd/usr/src/lib/libkvm/kvm_getswapinfo.c |
/* * Copyright (c) 1999, Matthew Dillon. All Rights Reserved. * Copyright (c) 2001, Thomas Moestl. 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. * * THIS SOFTWARE IS PROVIDED BY 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 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. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/lib/libkvm/kvm_getswapinfo.c 217744 2011-01-23 11:08:28Z uqs $"); #include <sys/param.h> #include <sys/time.h> #include <sys/stat.h> #include <sys/blist.h> #include <sys/sysctl.h> #include <vm/swap_pager.h> #include <vm/vm_param.h> #include <err.h> #include <errno.h> #include <fcntl.h> #include <kvm.h> #include <nlist.h> #include <paths.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <limits.h> #include "kvm_private.h" static struct nlist kvm_swap_nl[] = { { .n_name = "_swtailq" }, /* list of swap devices and sizes */ { .n_name = "_dmmax" }, /* maximum size of a swap block */ { .n_name = NULL } }; #define NL_SWTAILQ 0 #define NL_DMMAX 1 static int kvm_swap_nl_cached = 0; static int unswdev; /* number of found swap dev's */ static int dmmax; static int kvm_getswapinfo_kvm(kvm_t *, struct kvm_swap *, int, int); static int kvm_getswapinfo_sysctl(kvm_t *, struct kvm_swap *, int, int); static int nlist_init(kvm_t *); static int getsysctl(kvm_t *, const char *, void *, size_t); #define KREAD(kd, addr, obj) \ (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj)) #define KGET(idx, var) \ KGET2(kvm_swap_nl[(idx)].n_value, var, kvm_swap_nl[(idx)].n_name) #define KGET2(addr, var, msg) \ if (KREAD(kd, (u_long)(addr), (var))) { \ _kvm_err(kd, kd->program, "cannot read %s", msg); \ return (-1); \ } #define GETSWDEVNAME(dev, str, flags) \ if (dev == NODEV) { \ strlcpy(str, "[NFS swap]", sizeof(str)); \ } else { \ snprintf( \ str, sizeof(str),"%s%s", \ ((flags & SWIF_DEV_PREFIX) ? _PATH_DEV : ""), \ devname(dev, S_IFCHR) \ ); \ } int kvm_getswapinfo(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max, int flags) { /* * clear cache */ if (kd == NULL) { kvm_swap_nl_cached = 0; return(0); } if (ISALIVE(kd)) { return kvm_getswapinfo_sysctl(kd, swap_ary, swap_max, flags); } else { return kvm_getswapinfo_kvm(kd, swap_ary, swap_max, flags); } } int kvm_getswapinfo_kvm(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max, int flags) { int i, ttl; TAILQ_HEAD(, swdevt) swtailq; struct swdevt *sp, swinfo; struct kvm_swap tot; if (!nlist_init(kd)) return (-1); bzero(&tot, sizeof(tot)); KGET(NL_SWTAILQ, &swtailq); sp = TAILQ_FIRST(&swtailq); for (i = 0; sp != NULL; i++) { KGET2(sp, &swinfo, "swinfo"); ttl = swinfo.sw_nblks - dmmax; if (i < swap_max - 1) { bzero(&swap_ary[i], sizeof(swap_ary[i])); swap_ary[i].ksw_total = ttl; swap_ary[i].ksw_used = swinfo.sw_used; swap_ary[i].ksw_flags = swinfo.sw_flags; GETSWDEVNAME(swinfo.sw_dev, swap_ary[i].ksw_devname, flags); } tot.ksw_total += ttl; tot.ksw_used += swinfo.sw_used; sp = TAILQ_NEXT(&swinfo, sw_list); } if (i >= swap_max) i = swap_max - 1; if (i >= 0) swap_ary[i] = tot; return(i); } #define GETSYSCTL(kd, name, var) \ getsysctl(kd, name, &(var), sizeof(var)) /* The maximum MIB length for vm.swap_info and an additional device number */ #define SWI_MAXMIB 3 int kvm_getswapinfo_sysctl(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max, int flags) { int ti, ttl; size_t mibi, len; int soid[SWI_MAXMIB]; struct xswdev xsd; struct kvm_swap tot; if (!GETSYSCTL(kd, "vm.dmmax", dmmax)) return -1; mibi = SWI_MAXMIB - 1; if (sysctlnametomib("vm.swap_info", soid, &mibi) == -1) { _kvm_err(kd, kd->program, "sysctlnametomib failed: %s", strerror(errno)); return -1; } bzero(&tot, sizeof(tot)); for (unswdev = 0;; unswdev++) { soid[mibi] = unswdev; len = sizeof(xsd); if (sysctl(soid, mibi + 1, &xsd, &len, NULL, 0) == -1) { if (errno == ENOENT) break; _kvm_err(kd, kd->program, "cannot read sysctl: %s.", strerror(errno)); return -1; } if (len != sizeof(xsd)) { _kvm_err(kd, kd->program, "struct xswdev has unexpected " "size; kernel and libkvm out of sync?"); return -1; } if (xsd.xsw_version != XSWDEV_VERSION) { _kvm_err(kd, kd->program, "struct xswdev version " "mismatch; kernel and libkvm out of sync?"); return -1; } ttl = xsd.xsw_nblks - dmmax; if (unswdev < swap_max - 1) { bzero(&swap_ary[unswdev], sizeof(swap_ary[unswdev])); swap_ary[unswdev].ksw_total = ttl; swap_ary[unswdev].ksw_used = xsd.xsw_used; swap_ary[unswdev].ksw_flags = xsd.xsw_flags; GETSWDEVNAME(xsd.xsw_dev, swap_ary[unswdev].ksw_devname, flags); } tot.ksw_total += ttl; tot.ksw_used += xsd.xsw_used; } ti = unswdev; if (ti >= swap_max) ti = swap_max - 1; if (ti >= 0) swap_ary[ti] = tot; return(ti); } static int nlist_init(kvm_t *kd) { if (kvm_swap_nl_cached) return (1); if (kvm_nlist(kd, kvm_swap_nl) < 0) return (0); /* Required entries */ if (kvm_swap_nl[NL_SWTAILQ].n_value == 0) { _kvm_err(kd, kd->program, "unable to find swtailq"); return (0); } if (kvm_swap_nl[NL_DMMAX].n_value == 0) { _kvm_err(kd, kd->program, "unable to find dmmax"); return (0); } /* Get globals, type of swap */ KGET(NL_DMMAX, &dmmax); kvm_swap_nl_cached = 1; return (1); } static int getsysctl(kvm_t *kd, const char *name, void *ptr, size_t len) { size_t nlen = len; if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) { _kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name, strerror(errno)); return (0); } if (nlen != len) { _kvm_err(kd, kd->program, "sysctl %s has unexpected size", name); return (0); } return (1); }