tools/diag/dumpvfscache/dumpvfscache.c

   1 /* $FreeBSD: src/tools/diag/dumpvfscache/dumpvfscache.c,v 1.1.6.1 2001/03/05 12:17:00 kris Exp $ */
   2 /* $DragonFly: src/tools/diag/dumpvfscache/dumpvfscache.c,v 1.2 2003/06/17 04:29:11 dillon Exp $ */
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include <fcntl.h>
   7 #include <kvm.h>
   8 #include <nlist.h>
   9 #include <sys/uio.h>
  10 #include <sys/namei.h>
  11 #include <sys/param.h>
  12 #include <sys/time.h>
  13 #include <sys/vnode.h>
  14 /*----------------------------------*/
  15 static u_int crc16_table[16] = {
  16     0x0000, 0xCC01, 0xD801, 0x1400,
  17     0xF001, 0x3C00, 0x2800, 0xE401,
  18     0xA001, 0x6C00, 0x7800, 0xB401,
  19     0x5000, 0x9C01, 0x8801, 0x4400
  20 };
  21
  22 static u_short
  23 wlpsacrc(u_char *buf, u_int len)
  24 {
  25     u_short     crc = 0;
  26     int         i, r1;
  27
  28     for (i = 0; i < len; i++, buf++) {
  29         /* lower 4 bits */
  30         r1 = crc16_table[crc & 0xF];
  31         crc = (crc >> 4) & 0x0FFF;
  32         crc = crc ^ r1 ^ crc16_table[*buf & 0xF];
  33
  34         /* upper 4 bits */
  35         r1 = crc16_table[crc & 0xF];
  36         crc = (crc >> 4) & 0x0FFF;
  37         crc = crc ^ r1 ^ crc16_table[(*buf >> 4) & 0xF];
  38     }
  39     return(crc);
  40 }
  41
  42 /*----------------------------------*/
  43 struct nlist nl[] = {
  44         { "_nchash", 0},
  45         { "_nchashtbl", 0},
  46         { 0, 0 },
  47 };
  48
  49 int histo[2047];
  50 int histn[2047];
  51 int *newbucket;
  52
  53 int
  54 main(int argc, char **argv)
  55 {
  56         int nchash, i, j, k, kn;
  57         int nb, p1, p2;
  58         u_long p;
  59         LIST_HEAD(nchashhead, namecache) *nchashtbl;
  60         struct namecache *nc;
  61         struct vnode vn;
  62
  63         kvm_t *kvm = kvm_open(0, 0, 0, O_RDONLY, 0);
  64
  65         printf("kvm: %p\n", kvm);
  66         printf("kvm_nlist: %d\n", kvm_nlist(kvm, nl));
  67         kvm_read(kvm, nl[0].n_value, &nchash, sizeof nchash);
  68         nchash++;
  69         nchashtbl = malloc(nchash * sizeof *nchashtbl);
  70         nc = malloc(sizeof *nc + 400);
  71         newbucket = malloc(nchash * sizeof (int));
  72         memset(newbucket, 0, nchash * sizeof (int));
  73         kvm_read(kvm, nl[1].n_value, &p, sizeof p);
  74         kvm_read(kvm, p, nchashtbl, nchash * sizeof *nchashtbl);
  75         for (i=0; i < nchash; i++) {
  76 #if 0
  77                 printf("%d\n", i);
  78 #endif
  79                 nb=0;
  80                 p = (u_long)LIST_FIRST(nchashtbl+i);
  81                 while (p) {
  82                         nb++;
  83                         kvm_read(kvm, p, nc, sizeof *nc + 400);
  84                         kvm_read(kvm, (u_long)nc->nc_dvp, &vn, sizeof vn);
  85                         nc->nc_name[nc->nc_nlen] = '\0';
  86                         for (j=k=kn=0;nc->nc_name[j];j++) {
  87                                 k+= nc->nc_name[j];
  88                                 kn <<= 1;
  89                                 kn+= nc->nc_name[j];
  90                         }
  91                         /*
  92                         kn = k;
  93                         */
  94                         kn = wlpsacrc(nc->nc_name,nc->nc_nlen);
  95
  96                         /* kn += (u_long)vn.v_data >> 8;  */
  97                         /* kn += (u_long)nc->nc_dvp >> 7;    */
  98                         kn += vn.v_id;
  99                         kn &= (nchash - 1);
 100                         newbucket[kn]++;
 101 #if 1
 102                         printf("%4d  dvp %08x  hash %08x  vp %08x  id %08x  name <%s>\n",
 103                                 i,nc->nc_dvp, k, nc->nc_vp, vn.v_id, nc->nc_name);
 104 #endif
 105                         p = (u_long)LIST_NEXT(nc, nc_hash);
 106                 }
 107                 histo[nb]++;
 108         }
 109         for (i=0; i < nchash; i++) {
 110                 histn[newbucket[i]]++;
 111         }
 112         p1=p2 = 0;
 113         for (i=0;i<30;i++) {
 114                 p1 += histo[i] * i;
 115                 p2 += histn[i] * i;
 116                 if (histo[i] || histn[i])
 117                         printf("H%02d %4d %4d / %4d %4d\n",i,histo[i], p1 , histn[i], p2);
 118         }
 119
 120         return (0);
 121 }
 122