4 * cc -I/usr/src/sys ncptrace.c -o /usr/local/bin/ncptrace -lkvm
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.
13 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
15 * This code is derived from software contributed to The DragonFly Project
16 * by Matthew Dillon <dillon@backplane.com>
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
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
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.
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
45 * $DragonFly: src/test/debug/ncptrace.c,v 1.7 2007/05/06 20:45:01 dillon Exp $
48 #define _KERNEL_STRUCTURES
49 #include <sys/param.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>
58 #include <vm/vm_page.h>
59 #include <vm/vm_kern.h>
60 #include <vm/swap_pager.h>
61 #include <vm/vnode_pager.h>
77 static char *getncppath(kvm_t *kd, struct nchandle *nch, char *buf, int bytes);
78 static int 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 isnull, int tab, struct namecache *,
83 static long num_unres;
84 static long num_leafs;
86 static long num_cache;
89 main(int ac, char **av)
96 const char *corefile = NULL;
97 const char *sysfile = NULL;
105 while ((ch = getopt(ac, av, "M:N:")) != -1) {
114 fprintf(stderr, "%s [-M core] [-N system]\n", av[0]);
121 if ((kd = kvm_open(sysfile, corefile, NULL, O_RDONLY, "kvm:")) == NULL) {
125 if (kvm_nlist(kd, Nl) != 0) {
129 kkread(kd, Nl[0].n_value, &nch, sizeof(nch));
130 kkread(kd, Nl[1].n_value, &list, sizeof(list));
132 mntptr = TAILQ_FIRST(&list);
134 kkread(kd, (long)mntptr, &mntinfo, sizeof(mntinfo));
135 printf("MOUNT %p ", mntptr);
136 if (mntinfo.mnt_vfc) {
137 isnull = printvfc(kd, mntinfo.mnt_vfc);
142 mntpath[sizeof(mntpath)-1] = 0;
143 path = getncppath(kd, &mntinfo.mnt_ncmounton,
144 mntpath, sizeof(mntpath) - 1);
145 printf("ON %s\n", path);
147 dumpncp(kd, isnull, 0, mntinfo.mnt_ncmountpt.ncp, NULL);
150 for (i = 0; i < ac; ++i) {
151 if (strncmp(path, av[i], n) == 0) {
152 dumpncp(kd, isnull, 0,
153 mntinfo.mnt_ncmountpt.ncp, av[i] + n);
157 mntptr = TAILQ_NEXT(&mntinfo, mnt_list);
160 printf("numunres = %ld\n", num_unres);
161 printf("numleafs = %ld\n", num_leafs);
162 printf("numcache = %ld\n", num_cache);
163 printf("numneg = %ld\n", num_neg);
167 dumpncp(kvm_t *kd, int isnull, int tab,
168 struct namecache *ncptr, const char *path)
170 struct namecache ncp;
171 struct namecache *ncscan;
176 kkread(kd, (u_long)ncptr, &ncp, sizeof(ncp));
177 if (ncp.nc_nlen < sizeof(name)) {
178 kkread(kd, (u_long)ncp.nc_name, name, ncp.nc_nlen);
179 name[ncp.nc_nlen] = 0;
186 if ((ncp.nc_flag & NCF_UNRESOLVED) && ncp.nc_list.tqh_first == NULL)
188 if (ncp.nc_list.tqh_first == NULL)
192 if ((ncp.nc_flag & NCF_UNRESOLVED) == 0 && ncp.nc_vp == NULL)
197 strcpy(name, "FSROOT");
198 if (path && *path == '/')
200 } else if (name[0] == 0) {
205 if ((ptr = strchr(path, '/')) == NULL)
206 ptr = path + strlen(path);
207 if (strlen(name) != ptr - path ||
208 bcmp(name, path, ptr - path) != 0
216 if (path && *path == 0)
219 if (ncp.nc_list.tqh_first)
227 printf("%*.*s%s ", tab, tab, "", name);
228 printf("[ncp=%p par=%p %04x vp=%p",
229 ncptr, ncp.nc_parent, ncp.nc_flag, ncp.nc_vp);
231 printf(" timo=%d", ncp.nc_timeout);
233 printf(" refs=%d", ncp.nc_refs);
234 if (ncp.nc_generation)
235 printf(" gen=%d", ncp.nc_generation);
236 if ((ncp.nc_flag & NCF_UNRESOLVED) == 0 && ncp.nc_error)
237 printf(" error=%d", ncp.nc_error);
238 if (ncp.nc_flag & NCF_ISMOUNTPT)
239 printf(" MAYBEMOUNT");
240 if (ncp.nc_lock.lk_count & ~LKC_SHARED) {
241 printf(" LOCKSTATUS(%016lx,td=%p)",
242 ncp.nc_lock.lk_count, ncp.nc_lock.lk_lockholder);
247 printf(" %s\n", name);
249 printf("%s\n", haschildren ? " {" : "");
251 for (ncscan = ncp.nc_list.tqh_first; ncscan; ncscan = ncp.nc_entry.tqe_next) {
252 kkread(kd, (u_long)ncscan, &ncp, sizeof(ncp));
253 dumpncp(kd, isnull, (path ? (tab ? tab : 4) : tab + 4), ncscan, path);
255 if (haschildren && path == NULL)
256 printf("%*.*s}\n", tab, tab, "");
261 getncppath(kvm_t *kd, struct nchandle *nch, char *base, int bytes)
263 struct mount mntinfo;
264 struct namecache ncp;
265 struct namecache *ncpptr;
269 kkread(kd, (long)ncpptr, &ncp, sizeof(ncp));
270 if (ncp.nc_nlen >= bytes)
272 kkread(kd, (long)ncp.nc_name, base + bytes - ncp.nc_nlen, ncp.nc_nlen);
273 bytes -= ncp.nc_nlen;
277 ncpptr = ncp.nc_parent;
280 kkread(kd, (long)nch->mount, &mntinfo, sizeof(mntinfo));
281 if (mntinfo.mnt_ncmounton.mount)
282 return(getncppath(kd, &mntinfo.mnt_ncmounton, base, bytes));
283 } else if (base[bytes] == 0) {
286 return(base + bytes);
291 printvfc(kvm_t *kd, struct vfsconf *vfc)
293 struct vfsconf vfcinfo;
295 kkread(kd, (long)vfc, &vfcinfo, sizeof(vfcinfo));
296 printf("%s [type %d]", vfcinfo.vfc_name, vfcinfo.vfc_typenum);
298 return (strcmp(vfcinfo.vfc_name, "null") == 0);
302 kkread(kvm_t *kd, u_long addr, void *buf, size_t nbytes)
304 if (kvm_read(kd, addr, buf, nbytes) != nbytes) {