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NetBSD/usr.bin/pmap/pmap.c

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/* $NetBSD: pmap.c,v 1.12 2003/02/23 01:08:29 atatat Exp $ */
/*
* Copyright (c) 2002, 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Andrew Brown.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 THE FOUNDATION 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>
#ifndef lint
__RCSID("$NetBSD: pmap.c,v 1.12 2003/02/23 01:08:29 atatat Exp $");
#endif
#include <string.h>
#ifndef LOCKDEBUG
#define VERSION regular
#else /* LOCKDEBUG */
#define VERSION lockdebug
#endif /* LOCKDEBUG */
#include "pmap.h"
#include "main.h"
static void dump_vm_map(kvm_t *, pid_t, struct kinfo_proc2 *, struct kbit *,
struct kbit *, char *);
static size_t dump_vm_map_entry(kvm_t *, pid_t, struct kinfo_proc2 *,
struct kbit *, struct kbit *, int);
static char *findname(kvm_t *, struct kbit *, struct kbit *, struct kbit *,
struct kbit *, struct kbit *);
static int search_cache(kvm_t *, struct kbit *, char **, char *, size_t);
/* when recursing, output is indented */
#define indent(n) ((n) * (recurse > 1 ? recurse - 1 : 0))
void
PMAPFUNC(process_map,VERSION)(kvm_t *kd, pid_t pid, struct kinfo_proc2 *proc)
{
struct kbit kbit[2], *vmspace, *vm_map;
char *thing;
vmspace = &kbit[0];
vm_map = &kbit[1];
A(vmspace) = 0;
A(vm_map) = 0;
if (pid > 0) {
heapfound = 0;
A(vmspace) = (u_long)proc->p_vmspace;
S(vmspace) = sizeof(struct vmspace);
KDEREF(kd, vmspace);
thing = "proc->p_vmspace.vm_map";
} else {
heapfound = 1; /* but really, do kernels have a heap? */
A(vmspace) = 0;
S(vmspace) = 0;
thing = "kernel_map";
}
S(vm_map) = sizeof(struct vm_map);
if (pid > 0) {
A(vm_map) = A(vmspace) + offsetof(struct vmspace, vm_map);
memcpy(D(vm_map, vm_map), &D(vmspace, vmspace)->vm_map,
S(vm_map));
} else {
A(vm_map) = kernel_map_addr;
KDEREF(kd, vm_map);
}
(*dump_vm_map)(kd, pid, proc, vmspace, vm_map, thing);
}
static void
dump_vm_map(kvm_t *kd, pid_t pid, struct kinfo_proc2 *proc,
struct kbit *vmspace, struct kbit *vm_map, char *mname)
{
struct kbit kbit[2], *header, *vm_map_entry;
struct vm_map_entry *last, *next;
size_t total;
u_long addr, end;
header = &kbit[0];
vm_map_entry = &kbit[1];
A(header) = 0;
A(vm_map_entry) = 0;
A(header) = A(vm_map) + offsetof(struct vm_map, header);
S(header) = sizeof(struct vm_map_entry);
memcpy(D(header, vm_map_entry), &D(vm_map, vm_map)->header, S(header));
if (pid > 0 && (debug & PRINT_VMSPACE)) {
printf("proc->p_vmspace %p = {", P(vmspace));
printf(" vm_refcnt = %d,", D(vmspace, vmspace)->vm_refcnt);
printf(" vm_shm = %p,\n", D(vmspace, vmspace)->vm_shm);
printf(" vm_rssize = %d,", D(vmspace, vmspace)->vm_rssize);
printf(" vm_swrss = %d,", D(vmspace, vmspace)->vm_swrss);
printf(" vm_tsize = %d,", D(vmspace, vmspace)->vm_tsize);
printf(" vm_dsize = %d,\n", D(vmspace, vmspace)->vm_dsize);
printf(" vm_ssize = %d,", D(vmspace, vmspace)->vm_ssize);
printf(" vm_taddr = %p,", D(vmspace, vmspace)->vm_taddr);
printf(" vm_daddr = %p,\n", D(vmspace, vmspace)->vm_daddr);
printf(" vm_maxsaddr = %p,",
D(vmspace, vmspace)->vm_maxsaddr);
printf(" vm_minsaddr = %p }\n",
D(vmspace, vmspace)->vm_minsaddr);
}
if (debug & PRINT_VM_MAP) {
printf("%*s%s %p = {", indent(2), "", mname, P(vm_map));
printf(" pmap = %p,\n", D(vm_map, vm_map)->pmap);
printf("%*s lock = <struct lock>,", indent(2), "");
printf(" header = <struct vm_map_entry>,");
printf(" nentries = %d,\n", D(vm_map, vm_map)->nentries);
printf("%*s size = %lx,", indent(2), "",
D(vm_map, vm_map)->size);
printf(" ref_count = %d,", D(vm_map, vm_map)->ref_count);
printf(" ref_lock = <struct simplelock>,\n");
printf("%*s hint = %p,", indent(2), "",
D(vm_map, vm_map)->hint);
printf(" hint_lock = <struct simplelock>,\n");
printf("%*s first_free = %p,", indent(2), "",
D(vm_map, vm_map)->first_free);
printf(" flags = %x <%s%s%s%s%s%s%s >,\n", D(vm_map, vm_map)->flags,
D(vm_map, vm_map)->flags & VM_MAP_PAGEABLE ? " PAGEABLE" : "",
D(vm_map, vm_map)->flags & VM_MAP_INTRSAFE ? " INTRSAFE" : "",
D(vm_map, vm_map)->flags & VM_MAP_WIREFUTURE ? " WIREFUTURE" : "",
D(vm_map, vm_map)->flags & VM_MAP_BUSY ? " BUSY" : "",
D(vm_map, vm_map)->flags & VM_MAP_WANTLOCK ? " WANTLOCK" : "",
#ifdef VM_MAP_DYING
D(vm_map, vm_map)->flags & VM_MAP_DYING ? " DYING" :
#endif
"",
#ifdef VM_MAP_TOPDOWN
D(vm_map, vm_map)->flags & VM_MAP_TOPDOWN ? " TOPDOWN" :
#endif
"");
printf("%*s flags_lock = <struct simplelock>,", indent(2), "");
printf(" timestamp = %u }\n", D(vm_map, vm_map)->timestamp);
}
if (print_ddb) {
char *name;
if (A(vm_map) == kernel_map_addr)
name = "kernel_map";
else if (P(vm_map) == kmem_map)
name = "kmem_map";
else if (P(vm_map) == mb_map)
name = "mb_map";
else if (P(vm_map) == phys_map)
name = "phys_map";
else if (P(vm_map) == exec_map)
name = "exec_map";
else if (P(vm_map) == pager_map)
name = "pager_map";
else
name = NULL;
printf("%*s%s %p: [0x%lx->0x%lx]\n", indent(2), "",
recurse < 2 ? "MAP" : "SUBMAP", P(vm_map),
D(vm_map, vm_map)->min_offset,
D(vm_map, vm_map)->max_offset);
printf("\t%*s#ent=%d, sz=%ld, ref=%d, version=%d, flags=0x%x\n",
indent(2), "", D(vm_map, vm_map)->nentries,
D(vm_map, vm_map)->size, D(vm_map, vm_map)->ref_count,
D(vm_map, vm_map)->timestamp, D(vm_map, vm_map)->flags);
printf("\t%*spmap=%p(resident=<unknown>)\n", indent(2), "",
D(vm_map, vm_map)->pmap);
if (verbose && name != NULL)
printf("\t%*s([ %s ])\n", indent(2), "", name);
}
(*dump_vm_map_entry)(kd, pid, proc, vmspace, header, 1);
/*
* we're not recursing into a submap, so print headers
*/
if (recurse < 2) {
/* headers */
#ifdef DISABLED_HEADERS
if (print_map)
printf("%-*s %-*s rwx RWX CPY NCP I W A\n",
(int)sizeof(long) * 2 + 2, "Start",
(int)sizeof(long) * 2 + 2, "End");
if (print_maps)
printf("%-*s %-*s rwxp %-*s Dev Inode File\n",
(int)sizeof(long) * 2 + 0, "Start",
(int)sizeof(long) * 2 + 0, "End",
(int)sizeof(long) * 2 + 0, "Offset");
if (print_solaris)
printf("%-*s %*s Protection File\n",
(int)sizeof(long) * 2 + 0, "Start",
(int)sizeof(int) * 2 - 1, "Size ");
#endif
if (print_all)
printf("%-*s %-*s %*s %-*s rwxpc RWX I/W/A Dev %*s"
" - File\n",
(int)sizeof(long) * 2, "Start",
(int)sizeof(long) * 2, "End",
(int)sizeof(int) * 2, "Size ",
(int)sizeof(long) * 2, "Offset",
(int)sizeof(int) * 2, "Inode");
}
/* these are the "sub entries" */
total = 0;
next = D(header, vm_map_entry)->next;
last = P(header);
end = 0;
while (next != 0 && next != last) {
addr = (u_long)next;
A(vm_map_entry) = addr;
S(vm_map_entry) = sizeof(struct vm_map_entry);
KDEREF(kd, vm_map_entry);
next = D(vm_map_entry, vm_map_entry)->next;
if (end == 0)
end = D(vm_map_entry, vm_map_entry)->start;
else if (verbose > 1 &&
end != D(vm_map_entry, vm_map_entry)->start)
printf("%*s*\n", indent(2), "");
total += (*dump_vm_map_entry)(kd, pid, proc, vmspace,
vm_map_entry, 0);
end = D(vm_map_entry, vm_map_entry)->end;
}
/*
* we're not recursing into a submap, so print totals
*/
if (recurse < 2) {
if (print_solaris)
printf("%-*s %8luK\n",
(int)sizeof(void *) * 2 - 2, " total",
(unsigned long)total);
if (print_all)
printf("%-*s %9luk\n",
(int)sizeof(void *) * 4 - 1, " total",
(unsigned long)total);
}
}
static size_t
dump_vm_map_entry(kvm_t *kd, pid_t pid, struct kinfo_proc2 * proc,
struct kbit *vmspace, struct kbit *vm_map_entry, int ishead)
{
struct kbit kbit[3];
struct kbit *uvm_obj, *vp, *vfs;
struct vm_map_entry *vme;
size_t sz;
char *name;
dev_t dev;
ino_t inode;
uvm_obj = &kbit[0];
vp = &kbit[1];
vfs = &kbit[2];
A(uvm_obj) = 0;
A(vp) = 0;
A(vfs) = 0;
vme = D(vm_map_entry, vm_map_entry);
if ((ishead && (debug & PRINT_VM_MAP_HEADER)) ||
(!ishead && (debug & PRINT_VM_MAP_ENTRY))) {
printf("%*s%s %p = {", indent(2), "",
ishead ? "vm_map.header" : "vm_map_entry",
P(vm_map_entry));
printf(" prev = %p,", vme->prev);
printf(" next = %p,\n", vme->next);
printf("%*s start = %lx,", indent(2), "", vme->start);
printf(" end = %lx,", vme->end);
printf(" object.uvm_obj/sub_map = %p,\n", vme->object.uvm_obj);
printf("%*s offset = %" PRIx64 ",", indent(2), "",
vme->offset);
printf(" etype = %x <%s%s%s%s >,", vme->etype,
UVM_ET_ISOBJ(vme) ? " OBJ" : "",
UVM_ET_ISSUBMAP(vme) ? " SUBMAP" : "",
UVM_ET_ISCOPYONWRITE(vme) ? " COW" : "",
UVM_ET_ISNEEDSCOPY(vme) ? " NEEDSCOPY" : "");
printf(" protection = %x,\n", vme->protection);
printf("%*s max_protection = %x,", indent(2), "",
vme->max_protection);
printf(" inheritance = %d,", vme->inheritance);
printf(" wired_count = %d,\n", vme->wired_count);
printf("%*s aref = { ar_pageoff = %x, ar_amap = %p },",
indent(2), "", vme->aref.ar_pageoff, vme->aref.ar_amap);
printf(" advice = %d,\n", vme->advice);
printf("%*s flags = %x <%s%s > }\n", indent(2), "",
vme->flags,
vme->flags & UVM_MAP_STATIC ? " STATIC" : "",
vme->flags & UVM_MAP_KMEM ? " KMEM" : "");
}
if (ishead)
return (0);
A(vp) = 0;
A(uvm_obj) = 0;
if (vme->object.uvm_obj != NULL) {
P(uvm_obj) = vme->object.uvm_obj;
S(uvm_obj) = sizeof(struct uvm_object);
KDEREF(kd, uvm_obj);
if (UVM_ET_ISOBJ(vme) &&
UVM_OBJ_IS_VNODE(D(uvm_obj, uvm_object))) {
P(vp) = P(uvm_obj);
S(vp) = sizeof(struct vnode);
KDEREF(kd, vp);
}
}
A(vfs) = NULL;
if (P(vp) != NULL && D(vp, vnode)->v_mount != NULL) {
P(vfs) = D(vp, vnode)->v_mount;
S(vfs) = sizeof(struct mount);
KDEREF(kd, vfs);
D(vp, vnode)->v_mount = D(vfs, mount);
}
/*
* dig out the device number and inode number from certain
* file system types.
*/
#define V_DATA_IS(vp, type, d, i) do { \
struct kbit data; \
P(&data) = D(vp, vnode)->v_data; \
S(&data) = sizeof(*D(&data, type)); \
KDEREF(kd, &data); \
dev = D(&data, type)->d; \
inode = D(&data, type)->i; \
} while (0/*CONSTCOND*/)
dev = 0;
inode = 0;
if (A(vp) &&
D(vp, vnode)->v_type == VREG &&
D(vp, vnode)->v_data != NULL) {
switch (D(vp, vnode)->v_tag) {
case VT_UFS:
case VT_LFS:
case VT_EXT2FS:
V_DATA_IS(vp, inode, i_dev, i_number);
break;
case VT_ISOFS:
V_DATA_IS(vp, iso_node, i_dev, i_number);
break;
case VT_NON:
case VT_NFS:
case VT_MFS:
case VT_MSDOSFS:
case VT_LOFS:
case VT_FDESC:
case VT_PORTAL:
case VT_NULL:
case VT_UMAP:
case VT_KERNFS:
case VT_PROCFS:
case VT_AFS:
case VT_UNION:
case VT_ADOSFS:
case VT_CODA:
case VT_FILECORE:
case VT_NTFS:
case VT_VFS:
case VT_OVERLAY:
case VT_SMBFS:
break;
}
}
name = findname(kd, vmspace, vm_map_entry, vp, vfs, uvm_obj);
if (print_map) {
printf("%*s0x%lx 0x%lx %c%c%c %c%c%c %s %s %d %d %d",
indent(2), "",
vme->start, vme->end,
(vme->protection & VM_PROT_READ) ? 'r' : '-',
(vme->protection & VM_PROT_WRITE) ? 'w' : '-',
(vme->protection & VM_PROT_EXECUTE) ? 'x' : '-',
(vme->max_protection & VM_PROT_READ) ? 'r' : '-',
(vme->max_protection & VM_PROT_WRITE) ? 'w' : '-',
(vme->max_protection & VM_PROT_EXECUTE) ? 'x' : '-',
UVM_ET_ISCOPYONWRITE(vme) ? "COW" : "NCOW",
UVM_ET_ISNEEDSCOPY(vme) ? "NC" : "NNC",
vme->inheritance, vme->wired_count,
vme->advice);
if (verbose) {
if (inode)
printf(" %d,%d %d",
major(dev), minor(dev), inode);
if (name[0])
printf(" %s", name);
}
printf("\n");
}
if (print_maps) {
printf("%*s%0*lx-%0*lx %c%c%c%c %0*" PRIx64 " %02x:%02x %d %s\n",
indent(2), "",
(int)sizeof(void *) * 2, vme->start,
(int)sizeof(void *) * 2, vme->end,
(vme->protection & VM_PROT_READ) ? 'r' : '-',
(vme->protection & VM_PROT_WRITE) ? 'w' : '-',
(vme->protection & VM_PROT_EXECUTE) ? 'x' : '-',
UVM_ET_ISCOPYONWRITE(vme) ? 'p' : 's',
(int)sizeof(void *) * 2,
vme->offset,
major(dev), minor(dev), inode,
(name[0] != ' ') || verbose ? name : "");
}
if (print_ddb) {
printf("%*s - %p: 0x%lx->0x%lx: obj=%p/0x%" PRIx64 ", amap=%p/%d\n",
indent(2), "",
P(vm_map_entry), vme->start, vme->end,
vme->object.uvm_obj, vme->offset,
vme->aref.ar_amap, vme->aref.ar_pageoff);
printf("\t%*ssubmap=%c, cow=%c, nc=%c, prot(max)=%d/%d, inh=%d, "
"wc=%d, adv=%d\n",
indent(2), "",
UVM_ET_ISSUBMAP(vme) ? 'T' : 'F',
UVM_ET_ISCOPYONWRITE(vme) ? 'T' : 'F',
UVM_ET_ISNEEDSCOPY(vme) ? 'T' : 'F',
vme->protection, vme->max_protection,
vme->inheritance, vme->wired_count, vme->advice);
if (verbose) {
printf("\t%*s", indent(2), "");
if (inode)
printf("(dev=%d,%d ino=%d [%s] [%p])\n",
major(dev), minor(dev), inode,
name, P(vp));
else if (name[0] == ' ')
printf("(%s)\n", &name[2]);
else
printf("(%s)\n", name);
}
}
sz = 0;
if (print_solaris) {
char prot[30];
prot[0] = '\0';
prot[1] = '\0';
if (vme->protection & VM_PROT_READ)
strcat(prot, "/read");
if (vme->protection & VM_PROT_WRITE)
strcat(prot, "/write");
if (vme->protection & VM_PROT_EXECUTE)
strcat(prot, "/exec");
sz = (size_t)((vme->end - vme->start) / 1024);
printf("%*s%0*lX %6luK %-15s %s\n",
indent(2), "",
(int)sizeof(void *) * 2,
(unsigned long)vme->start,
(unsigned long)sz,
&prot[1],
name);
}
if (print_all) {
sz = (size_t)((vme->end - vme->start) / 1024);
printf(A(vp) ?
"%*s%0*lx-%0*lx %7luk %0*" PRIx64 " %c%c%c%c%c (%c%c%c) %d/%d/%d %02d:%02d %7d - %s [%p]\n" :
"%*s%0*lx-%0*lx %7luk %0*" PRIx64 " %c%c%c%c%c (%c%c%c) %d/%d/%d %02d:%02d %7d - %s\n",
indent(2), "",
(int)sizeof(void *) * 2,
vme->start,
(int)sizeof(void *) * 2,
vme->end - (vme->start != vme->end ? 1 : 0),
(unsigned long)sz,
(int)sizeof(void *) * 2,
vme->offset,
(vme->protection & VM_PROT_READ) ? 'r' : '-',
(vme->protection & VM_PROT_WRITE) ? 'w' : '-',
(vme->protection & VM_PROT_EXECUTE) ? 'x' : '-',
UVM_ET_ISCOPYONWRITE(vme) ? 'p' : 's',
UVM_ET_ISNEEDSCOPY(vme) ? '+' : '-',
(vme->max_protection & VM_PROT_READ) ? 'r' : '-',
(vme->max_protection & VM_PROT_WRITE) ? 'w' : '-',
(vme->max_protection & VM_PROT_EXECUTE) ? 'x' : '-',
vme->inheritance,
vme->wired_count,
vme->advice,
major(dev), minor(dev), inode,
name, P(vp));
}
/* no access allowed, don't count space */
if ((vme->protection & rwx) == 0)
sz = 0;
if (recurse && UVM_ET_ISSUBMAP(vme)) {
struct kbit mkbit, *submap;
recurse++;
submap = &mkbit;
P(submap) = vme->object.sub_map;
S(submap) = sizeof(*vme->object.sub_map);
KDEREF(kd, submap);
(*dump_vm_map)(kd, pid, proc, vmspace, submap, "submap");
recurse--;
}
return (sz);
}
static char*
findname(kvm_t *kd, struct kbit *vmspace,
struct kbit *vm_map_entry, struct kbit *vp,
struct kbit *vfs, struct kbit *uvm_obj)
{
static char buf[1024], *name;
struct vm_map_entry *vme;
size_t l;
vme = D(vm_map_entry, vm_map_entry);
if (UVM_ET_ISOBJ(vme)) {
if (A(vfs)) {
l = (unsigned)strlen(D(vfs, mount)->mnt_stat.f_mntonname);
switch (search_cache(kd, vp, &name, buf, sizeof(buf))) {
case 0: /* found something */
name--;
*name = '/';
/*FALLTHROUGH*/
case 2: /* found nothing */
name -= 5;
memcpy(name, " -?- ", (size_t)5);
name -= l;
memcpy(name,
D(vfs, mount)->mnt_stat.f_mntonname, l);
break;
case 1: /* all is well */
name--;
*name = '/';
if (l != 1) {
name -= l;
memcpy(name,
D(vfs, mount)->mnt_stat.f_mntonname, l);
}
break;
}
}
else if (UVM_OBJ_IS_DEVICE(D(uvm_obj, uvm_object))) {
struct kbit kdev;
dev_t dev;
P(&kdev) = P(uvm_obj);
S(&kdev) = sizeof(struct uvm_device);
KDEREF(kd, &kdev);
dev = D(&kdev, uvm_device)->u_device;
name = devname(dev, S_IFCHR);
if (name != NULL)
snprintf(buf, sizeof(buf), "/dev/%s", name);
else
snprintf(buf, sizeof(buf), " [ device %d,%d ]",
major(dev), minor(dev));
name = buf;
}
else if (UVM_OBJ_IS_AOBJ(D(uvm_obj, uvm_object)))
name = " [ uvm_aobj ]";
else if (UVM_OBJ_IS_UBCPAGER(D(uvm_obj, uvm_object)))
name = " [ ubc_pager ]";
else if (UVM_OBJ_IS_VNODE(D(uvm_obj, uvm_object)))
name = " [ ?VNODE? ]";
else {
snprintf(buf, sizeof(buf), " [ ?? %p ?? ]",
D(uvm_obj, uvm_object)->pgops);
name = buf;
}
}
else if (D(vmspace, vmspace)->vm_maxsaddr <=
(caddr_t)vme->start &&
(D(vmspace, vmspace)->vm_maxsaddr + (size_t)maxssiz) >=
(caddr_t)vme->end)
name = " [ stack ]";
else if ((vme->protection & rwx) == rwx && !heapfound) {
/* XXX this could probably be done better */
heapfound = 1;
name = " [ heap ]";
}
else
name = " [ anon ]";
return (name);
}
static int
search_cache(kvm_t *kd, struct kbit *vp, char **name, char *buf, size_t blen)
{
char *o, *e;
struct cache_entry *ce;
struct kbit svp;
u_long cid;
if (nchashtbl == NULL)
load_name_cache(kd);
P(&svp) = P(vp);
S(&svp) = sizeof(struct vnode);
cid = D(vp, vnode)->v_id;
e = &buf[blen - 1];
o = e;
do {
LIST_FOREACH(ce, &lcache, ce_next)
if (ce->ce_vp == P(&svp) && ce->ce_cid == cid)
break;
if (ce && ce->ce_vp == P(&svp) && ce->ce_cid == cid) {
if (o != e)
*(--o) = '/';
o -= ce->ce_nlen;
memcpy(o, ce->ce_name, (unsigned)ce->ce_nlen);
P(&svp) = ce->ce_pvp;
cid = ce->ce_pcid;
}
else
break;
} while (1/*CONSTCOND*/);
*e = '\0';
*name = o;
if (e == o)
return (2);
KDEREF(kd, &svp);
return (D(&svp, vnode)->v_flag & VROOT);
}
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