Change this to support the new way swap device information is exported
via sysctl, and clean up some style and (size_t != int) issues.
This commit is contained in:
Thomas Moestl
parent
5c5c8fa826
commit
e04a7c4ae5
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=77605
@ -27,7 +27,10 @@ static const char rcsid[] =
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#include <sys/blist.h>
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#include <sys/sysctl.h>
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#include <vm/vm_param.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <kvm.h>
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#include <nlist.h>
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@ -65,9 +68,7 @@ static int kvm_getswapinfo2(kvm_t *kd, struct kvm_swap *swap_ary,
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static int kvm_getswapinfo_kvm(kvm_t *, struct kvm_swap *, int, int);
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static int kvm_getswapinfo_sysctl(kvm_t *, struct kvm_swap *, int, int);
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static int nlist_init(kvm_t *);
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static int getsysctl(kvm_t *, char *, void *, int);
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static int getsysctl2(kvm_t *, char *, char *, char *, int, void *, int);
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static int getsysctl(kvm_t *, char *, void *, size_t);
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#define SVAR(var) __STRING(var) /* to force expansion */
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#define KGET(idx, var) \
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@ -89,15 +90,15 @@ static int getsysctl2(kvm_t *, char *, char *, char *, int, void *, int);
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return (0); \
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}
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#define GETSWDEVNAME(dev, str, flags) \
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if (dev == NODEV) { \
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strlcpy(str, "[NFS swap]", sizeof(str)); \
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} else { \
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snprintf( \
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str, sizeof(str),"%s%s", \
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((flags & SWIF_DEV_PREFIX) ? _PATH_DEV : ""), \
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devname(dev, S_IFCHR) \
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); \
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#define GETSWDEVNAME(dev, str, flags) \
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if (dev == NODEV) { \
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strlcpy(str, "[NFS swap]", sizeof(str)); \
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} else { \
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snprintf( \
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str, sizeof(str),"%s%s", \
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((flags & SWIF_DEV_PREFIX) ? _PATH_DEV : ""), \
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devname(dev, S_IFCHR) \
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); \
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}
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int
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@ -458,11 +459,11 @@ getswapinfo_radix(kvm_t *kd, struct kvm_swap *swap_ary, int swap_max, int flags)
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);
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}
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#define GETSYSCTL(kd, name, var) \
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getsysctl(kd, name, &(var), sizeof(var))
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#define GETSYSCTL2(kd, pref, suff, buf, var) \
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getsysctl2(kd, pref, suff, buf, sizeof(buf), &(var), \
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sizeof(var))
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#define GETSYSCTL(kd, name, var) \
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getsysctl(kd, name, &(var), sizeof(var))
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/* The maximum MIB length for vm.swap_info and an additional device number */
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#define SWI_MAXMIB 3
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int
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kvm_getswapinfo_sysctl(
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@ -471,53 +472,61 @@ kvm_getswapinfo_sysctl(
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int swap_max,
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int flags
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) {
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int ti = 0;
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udev_t dev;
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char node[15];
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char buf[20];
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int used, ttl, i;
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if (!GETSYSCTL(kd, "vm.nswapdev", unswdev))
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return -1;
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ti = unswdev;
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if (ti >= swap_max)
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ti = swap_max - 1;
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if (ti >= 0)
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bzero(swap_ary, sizeof(struct kvm_swap) * (ti + 1));
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int ti, ttl;
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size_t mibi, len;
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int soid[SWI_MAXMIB];
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struct xswdev xsd;
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struct kvm_swap tot;
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if (!GETSYSCTL(kd, "vm.dmmax", dmmax))
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return -1;
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for (i = 0; i < unswdev; ++i) {
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if (snprintf(node, sizeof(node), "vm.swapdev%d.", i) >=
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sizeof(node)) {
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_kvm_err(kd, kd->program, "XXX: node buffer too small");
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return -1;
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}
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if (!GETSYSCTL2(kd, node, "nblks", buf, ttl))
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return -1;
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if (!GETSYSCTL2(kd, node, "used", buf, used))
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return -1;
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ttl -= dmmax;
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if (i < ti) {
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if (!GETSYSCTL2(kd, node, "dev", buf, dev))
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return -1;
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if (!GETSYSCTL2(kd, node, "flags", buf,
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swap_ary[i].ksw_flags))
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return -1;
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swap_ary[i].ksw_total = ttl;
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swap_ary[i].ksw_used = used;
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GETSWDEVNAME(dev, swap_ary[i].ksw_devname, flags);
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}
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if (ti >= 0) {
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swap_ary[ti].ksw_total += ttl;
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swap_ary[ti].ksw_used += used;
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}
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mibi = SWI_MAXMIB - 1;
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if (sysctlnametomib("vm.swap_info", soid, &mibi) == -1) {
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_kvm_err(kd, kd->program, "sysctlnametomib failed: %s",
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strerror(errno));
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return -1;
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}
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bzero(&tot, sizeof(tot));
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for (unswdev = 0;; unswdev++) {
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soid[mibi] = unswdev;
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len = sizeof(xsd);
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if (sysctl(soid, mibi + 1, &xsd, &len, NULL, 0) == -1) {
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if (errno == ENOENT)
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break;
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_kvm_err(kd, kd->program, "cannot read sysctl: %s.",
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strerror(errno));
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return -1;
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}
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if (len != sizeof(xsd)) {
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_kvm_err(kd, kd->program, "struct xswdev has unexpected "
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"size; kernel and libkvm out of sync?");
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return -1;
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}
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if (xsd.xsw_version != XSWDEV_VERSION) {
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_kvm_err(kd, kd->program, "struct xswdev version "
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"mismatch; kernel and libkvm out of sync?");
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return -1;
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}
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ttl = xsd.xsw_nblks - dmmax;
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if (unswdev < swap_max - 1) {
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bzero(&swap_ary[unswdev], sizeof(swap_ary[unswdev]));
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swap_ary[unswdev].ksw_total = ttl;
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swap_ary[unswdev].ksw_used = xsd.xsw_used;
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swap_ary[unswdev].ksw_flags = xsd.xsw_flags;
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GETSWDEVNAME(xsd.xsw_dev, swap_ary[unswdev].ksw_devname,
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flags);
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}
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tot.ksw_total += ttl;
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tot.ksw_used += xsd.xsw_used;
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}
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ti = unswdev;
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if (ti >= swap_max)
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ti = swap_max - 1;
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if (ti >= 0)
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swap_ary[ti] = tot;
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return(ti);
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}
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@ -574,11 +583,12 @@ getsysctl (
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kvm_t *kd,
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char *name,
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void *ptr,
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int len
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size_t len
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) {
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int nlen = len;
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size_t nlen = len;
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if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
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_kvm_err(kd, kd->program, "cannot read sysctl %s", name);
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_kvm_err(kd, kd->program, "cannot read sysctl %s:%s", name,
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strerror(errno));
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return (0);
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}
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if (nlen != len) {
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@ -587,24 +597,3 @@ getsysctl (
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}
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return (1);
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}
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static int
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getsysctl2 (
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kvm_t *kd,
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char *pref,
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char *suff,
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char *buf,
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int buflen,
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void *ptr,
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int len
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) {
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if (strlcpy(buf, pref, buflen) >= buflen) {
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_kvm_err(kd, kd->program, "getsysctl2: string buffer too small");
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return (0);
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}
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if (strlcat(buf, suff, buflen) >= buflen) {
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_kvm_err(kd, kd->program, "getsysctl2: string buffer too small");
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return (0);
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}
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return getsysctl(kd, buf, ptr, len);
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}
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