test/debug/ncptrace.c

   1 /*
   2  * NCPTRACE.C
   3  *
   4  * cc -I/usr/src/sys ncptrace.c -o /usr/local/bin/ncptrace -lkvm
   5  *
   6  * ncptrace
   7  * ncptrace [path]
   8  *
   9  * Trace and dump the kernel namecache hierarchy.  If a path is specified
  10  * the trace begins there, otherwise the trace begins at the root.
  11  *
  12  *
  13  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
  14  *
  15  * This code is derived from software contributed to The DragonFly Project
  16  * by Matthew Dillon <dillon@backplane.com>
  17  *
  18  * Redistribution and use in source and binary forms, with or without
  19  * modification, are permitted provided that the following conditions
  20  * are met:
  21  *
  22  * 1. Redistributions of source code must retain the above copyright
  23  *    notice, this list of conditions and the following disclaimer.
  24  * 2. Redistributions in binary form must reproduce the above copyright
  25  *    notice, this list of conditions and the following disclaimer in
  26  *    the documentation and/or other materials provided with the
  27  *    distribution.
  28  * 3. Neither the name of The DragonFly Project nor the names of its
  29  *    contributors may be used to endorse or promote products derived
  30  *    from this software without specific, prior written permission.
  31  *
  32  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  33  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  34  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  35  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  36  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  37  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  38  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  39  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  40  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  41  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  42  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  43  * SUCH DAMAGE.
  44  *
  45  * $DragonFly: src/test/debug/ncptrace.c,v 1.7 2007/05/06 20:45:01 dillon Exp $
  46  */
  47
  48 #define _KERNEL_STRUCTURES
  49 #include <sys/param.h>
  50 #include <sys/user.h>
  51 #include <sys/malloc.h>
  52 #include <sys/signalvar.h>
  53 #include <sys/vnode.h>
  54 #include <sys/namecache.h>
  55 #include <sys/mount.h>
  56
  57 #include <vm/vm.h>
  58 #include <vm/vm_page.h>
  59 #include <vm/vm_kern.h>
  60 #include <vm/swap_pager.h>
  61 #include <vm/vnode_pager.h>
  62
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <fcntl.h>
  67 #include <kvm.h>
  68 #include <nlist.h>
  69 #include <getopt.h>
  70
  71 struct nlist Nl[] = {
  72     { "_rootnch" },
  73     { "_mountlist" },
  74     { NULL }
  75 };
  76
  77 static char *getncppath(kvm_t *kd, struct nchandle *nch, char *buf, int bytes);
  78 static void printvfc(kvm_t *kd, struct vfsconf *vfc);
  79 static void kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes);
  80 static void dumpncp(kvm_t *kd, int tab, struct namecache *, const char *);
  81
  82 int
  83 main(int ac, char **av)
  84 {
  85     struct nchandle nch;
  86     struct mount mntinfo;
  87     struct mount *mntptr;
  88     struct mntlist list;
  89     kvm_t *kd;
  90     const char *corefile = NULL;
  91     const char *sysfile = NULL;
  92     const char *path;
  93     int ch;
  94     int i;
  95     int n;
  96     char mntpath[1024];
  97
  98     while ((ch = getopt(ac, av, "M:N:")) != -1) {
  99         switch(ch) {
 100         case 'M':
 101             corefile = optarg;
 102             break;
 103         case 'N':
 104             sysfile = optarg;
 105             break;
 106         default:
 107             fprintf(stderr, "%s [-M core] [-N system]\n", av[0]);
 108             exit(1);
 109         }
 110     }
 111     ac -= optind;
 112     av += optind;
 113
 114     if ((kd = kvm_open(sysfile, corefile, NULL, O_RDONLY, "kvm:")) == NULL) {
 115         perror("kvm_open");
 116         exit(1);
 117     }
 118     if (kvm_nlist(kd, Nl) != 0) {
 119         perror("kvm_nlist");
 120         exit(1);
 121     }
 122     kkread(kd, Nl[0].n_value, &nch, sizeof(nch));
 123     kkread(kd, Nl[1].n_value, &list, sizeof(list));
 124
 125     mntptr = TAILQ_FIRST(&list);
 126     while (mntptr) {
 127         kkread(kd, (long)mntptr, &mntinfo, sizeof(mntinfo));
 128         printf("MOUNT %p ", mntptr);
 129         if (mntinfo.mnt_vfc) {
 130             printvfc(kd, mntinfo.mnt_vfc);
 131             printf(" ");
 132         }
 133         mntpath[sizeof(mntpath)-1] = 0;
 134         path = getncppath(kd, &mntinfo.mnt_ncmounton,
 135                           mntpath, sizeof(mntpath) - 1);
 136         printf("ON %s\n", path);
 137         if (ac == 0) {
 138             dumpncp(kd, 0, mntinfo.mnt_ncmountpt.ncp, NULL);
 139         } else {
 140             n = strlen(path);
 141             for (i = 0; i < ac; ++i) {
 142                 if (strncmp(path, av[i], n) == 0) {
 143                     dumpncp(kd, 0, mntinfo.mnt_ncmountpt.ncp, av[i] + n);
 144                 }
 145             }
 146         }
 147         mntptr = TAILQ_NEXT(&mntinfo, mnt_list);
 148     }
 149 }
 150
 151 static void
 152 dumpncp(kvm_t *kd, int tab, struct namecache *ncptr, const char *path)
 153 {
 154     struct namecache ncp;
 155     struct namecache *ncscan;
 156     const char *ptr;
 157     int haschildren;
 158     char name[256];
 159
 160     kkread(kd, (u_long)ncptr, &ncp, sizeof(ncp));
 161     if (ncp.nc_nlen < sizeof(name)) {
 162         kkread(kd, (u_long)ncp.nc_name, name, ncp.nc_nlen);
 163         name[ncp.nc_nlen] = 0;
 164     } else {
 165         name[0] = 0;
 166     }
 167     if (tab == 0) {
 168         strcpy(name, "FSROOT");
 169         if (path && *path == '/')
 170             ++path;
 171     } else if (name[0] == 0) {
 172         strcpy(name, "?");
 173         if (path)
 174             return;
 175     } else if (path) {
 176         if ((ptr = strchr(path, '/')) == NULL)
 177             ptr = path + strlen(path);
 178         if (strlen(name) != ptr - path ||
 179             bcmp(name, path, ptr - path) != 0
 180         ) {
 181             return;
 182         }
 183         path = ptr;
 184         if (*path == '/')
 185             ++path;
 186     }
 187     if (path && *path == 0)
 188         path = NULL;
 189
 190     if (ncp.nc_list.tqh_first)
 191         haschildren = 1;
 192     else
 193         haschildren = 0;
 194
 195     if (path)
 196         printf("ELM ");
 197     else
 198         printf("%*.*s%s ", tab, tab, "", name);
 199     printf("[ncp=%p par=%p %04x vp=%p",
 200             ncptr, ncp.nc_parent, ncp.nc_flag, ncp.nc_vp);
 201     if (ncp.nc_timeout)
 202         printf(" timo=%d", ncp.nc_timeout);
 203     if (ncp.nc_refs)
 204         printf(" refs=%d", ncp.nc_refs);
 205     if ((ncp.nc_flag & NCF_UNRESOLVED) == 0 && ncp.nc_error)
 206         printf(" error=%d", ncp.nc_error);
 207     if (ncp.nc_flag & NCF_ISMOUNTPT)
 208         printf(" MAYBEMOUNT");
 209     if (ncp.nc_exlocks)
 210         printf(" LOCKED(%d,td=%p)", ncp.nc_exlocks, ncp.nc_locktd);
 211     printf("]");
 212
 213     if (path) {
 214         printf(" %s\n", name);
 215     } else {
 216         printf("%s\n", haschildren ? " {" : "");
 217     }
 218     for (ncscan = ncp.nc_list.tqh_first; ncscan; ncscan = ncp.nc_entry.tqe_next) {
 219         kkread(kd, (u_long)ncscan, &ncp, sizeof(ncp));
 220         dumpncp(kd, (path ? (tab ? tab : 4) : tab + 4), ncscan, path);
 221     }
 222     if (haschildren && path == NULL)
 223         printf("%*.*s}\n", tab, tab, "");
 224 }
 225
 226 static
 227 char *
 228 getncppath(kvm_t *kd, struct nchandle *nch, char *base, int bytes)
 229 {
 230     struct mount mntinfo;
 231     struct mount *mntptr;
 232     struct namecache ncp;
 233     struct namecache *ncpptr;
 234
 235     ncpptr = nch->ncp;
 236     while (ncpptr) {
 237         kkread(kd, (long)ncpptr, &ncp, sizeof(ncp));
 238         if (ncp.nc_nlen >= bytes)
 239             break;
 240         kkread(kd, (long)ncp.nc_name, base + bytes - ncp.nc_nlen, ncp.nc_nlen);
 241         bytes -= ncp.nc_nlen;
 242         if (ncp.nc_parent) {
 243             base[--bytes] = '/';
 244         }
 245         ncpptr = ncp.nc_parent;
 246     }
 247     if (nch->mount) {
 248         kkread(kd, (long)nch->mount, &mntinfo, sizeof(mntinfo));
 249         if (mntinfo.mnt_ncmounton.mount)
 250             return(getncppath(kd, &mntinfo.mnt_ncmounton, base, bytes));
 251     } else if (base[bytes] == 0) {
 252         base[--bytes] = '/';
 253     }
 254     return(base + bytes);
 255 }
 256
 257 static
 258 void
 259 printvfc(kvm_t *kd, struct vfsconf *vfc)
 260 {
 261     struct vfsconf vfcinfo;
 262
 263     kkread(kd, (long)vfc, &vfcinfo, sizeof(vfcinfo));
 264     printf("%s [type %d]", vfcinfo.vfc_name, vfcinfo.vfc_typenum);
 265 }
 266
 267 static void
 268 kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes)
 269 {
 270     if (kvm_read(kd, addr, buf, nbytes) != nbytes) {
 271         perror("kvm_read");
 272         exit(1);
 273     }
 274 }
 275