685 lines
15 KiB
C
685 lines
15 KiB
C
/*
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* Copyright (c) 1990, 1992 Jan-Simon Pendry
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: kernfs_vnops.c,v 1.6 1993/04/27 10:06:10 cgd Exp $
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*/
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/*
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* Kernel parameter filesystem
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*/
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#include "param.h"
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#include "systm.h"
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#include "kernel.h"
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#include "types.h"
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#include "time.h"
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#include "proc.h"
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#include "file.h"
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#include "vnode.h"
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#include "stat.h"
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#include "mount.h"
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#include "namei.h"
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#include "buf.h"
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#include "miscfs/kernfs/kernfs.h"
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#include "../ufs/dir.h" /* For readdir() XXX */
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#define KSTRING 256 /* Largest I/O available via this filesystem */
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#define UIO_MX 32
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struct kern_target {
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char *kt_name;
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void *kt_data;
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#define KTT_NULL 1
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#define KTT_TIME 5
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#define KTT_INT 17
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#define KTT_STRING 31
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#define KTT_HOSTNAME 47
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#define KTT_AVENRUN 53
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int kt_tag;
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#define KTM_RO 0
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#define KTM_RO_MODE (S_IRUSR|S_IRGRP|S_IROTH)
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#define KTM_RW 43
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#define KTM_RW_MODE (S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH)
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#define KTM_DIR_MODE (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
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int kt_rw;
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int kt_vtype;
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} kern_targets[] = {
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/* NOTE: The name must be less than UIO_MX-16 chars in length */
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/* name data tag ro/rw */
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{ ".", 0, KTT_NULL, KTM_RO, VDIR },
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{ "..", 0, KTT_NULL, KTM_RO, VDIR },
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{ "copyright", copyright, KTT_STRING, KTM_RO, VREG },
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{ "hostname", 0, KTT_HOSTNAME, KTM_RW, VREG },
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{ "hz", &hz, KTT_INT, KTM_RO, VREG },
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{ "loadavg", 0, KTT_AVENRUN, KTM_RO, VREG },
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{ "physmem", &physmem, KTT_INT, KTM_RO, VREG },
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{ "root", 0, KTT_NULL, KTM_RO, VDIR },
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{ "rootdev", 0, KTT_NULL, KTM_RO, VBLK },
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{ "rrootdev", 0, KTT_NULL, KTM_RO, VCHR },
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{ "time", 0, KTT_TIME, KTM_RO, VREG },
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{ "version", version, KTT_STRING, KTM_RO, VREG },
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};
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static int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]);
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static int
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kernfs_xread(kt, buf, len, lenp)
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struct kern_target *kt;
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char *buf;
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int len;
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int *lenp;
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{
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int xlen;
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switch (kt->kt_tag) {
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case KTT_TIME: {
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struct timeval tv;
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microtime(&tv);
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sprintf(buf, "%d %d\n", tv.tv_sec, tv.tv_usec);
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break;
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}
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case KTT_INT: {
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int *ip = kt->kt_data;
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sprintf(buf, "%d\n", *ip);
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break;
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}
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case KTT_STRING: {
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char *cp = kt->kt_data;
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int xlen = strlen(cp) + 1;
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if (xlen >= len)
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return (EINVAL);
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bcopy(cp, buf, xlen);
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break;
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}
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case KTT_HOSTNAME: {
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char *cp = hostname;
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int xlen = hostnamelen;
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if (xlen + 2 > len) /* extra space for null and newline */
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return (EINVAL);
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bcopy(cp, buf, xlen); /* safer than sprintf */
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buf[xlen] = '\n';
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buf[xlen+1] = '\0';
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break;
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}
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case KTT_AVENRUN:
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sprintf(buf, "%d %d %d %d\n",
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averunnable[0],
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averunnable[1],
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averunnable[2],
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FSCALE);
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break;
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default:
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return (EINVAL);
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}
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*lenp = strlen(buf);
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return (0);
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}
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static int
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kernfs_xwrite(kt, buf, len)
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struct kern_target *kt;
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char *buf;
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int len;
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{
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switch (kt->kt_tag) {
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case KTT_HOSTNAME: {
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if (buf[len-1] == '\n')
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--len;
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bcopy(buf, hostname, len);
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/* kernfs_write set buf[value_passed_as_len] = \0.
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* therefore, buf len (hostnamelen) = len.
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*/
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hostnamelen = len;
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hostname[hostnamelen] = '\0'; /* null end of string. */
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return (0);
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}
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default:
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return (EIO);
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}
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}
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/*
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* vp is the current namei directory
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* ndp is the name to locate in that directory...
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*/
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kernfs_lookup(dvp, ndp, p)
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struct vnode *dvp;
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struct nameidata *ndp;
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struct proc *p;
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{
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char *pname = ndp->ni_ptr;
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int error = ENOENT;
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int i;
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struct vnode *fvp;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_lookup(%s)\n", pname);
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#endif
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if (ndp->ni_namelen == 1 && *pname == '.') {
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ndp->ni_dvp = dvp;
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ndp->ni_vp = dvp;
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VREF(dvp);
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/*VOP_LOCK(dvp);*/
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return (0);
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}
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if (ndp->ni_namelen == 4 && bcmp(pname, "root", 4) == 0) {
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ndp->ni_dvp = dvp;
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ndp->ni_vp = rootdir;
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VREF(rootdir);
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VOP_LOCK(rootdir);
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return (0);
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}
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/*
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* /kern/rootdev is the root device
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*/
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if (ndp->ni_namelen == 7 && bcmp(pname, "rootdev", 7) == 0) {
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if (vfinddev(rootdev, VBLK, &fvp))
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return (ENXIO);
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ndp->ni_dvp = dvp;
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ndp->ni_vp = fvp;
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VREF(fvp);
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VOP_LOCK(fvp);
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return (0);
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}
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/*
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* /kern/rrootdev is the root device
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*/
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if (ndp->ni_namelen == 8 && bcmp(pname, "rrootdev", 7) == 0) {
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ndp->ni_dvp = dvp;
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ndp->ni_vp = rrootdevvp;
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VREF(rrootdevvp);
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VOP_LOCK(rrootdevvp);
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return (0);
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}
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for (i = 0; i < nkern_targets; i++) {
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struct kern_target *kt = &kern_targets[i];
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if (ndp->ni_namelen == strlen(kt->kt_name) &&
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bcmp(kt->kt_name, pname, ndp->ni_namelen) == 0) {
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error = 0;
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break;
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}
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}
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_lookup: i = %d, error = %d\n", i, error);
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#endif
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if (error)
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goto bad;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_lookup: allocate new vnode\n");
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#endif
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error = getnewvnode(VT_UFS, dvp->v_mount, &kernfs_vnodeops, &fvp);
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if (error)
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goto bad;
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VTOKERN(fvp)->kf_kt = &kern_targets[i];
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fvp->v_type = VTOKERN(fvp)->kf_kt->kt_vtype;
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ndp->ni_dvp = dvp;
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ndp->ni_vp = fvp;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_lookup: newvp = %x\n", fvp);
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#endif
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return (0);
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bad:;
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ndp->ni_dvp = dvp;
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ndp->ni_vp = NULL;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_lookup: error = %d\n", error);
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#endif
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return (error);
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}
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kernfs_open(vp, mode, cred, p)
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struct vnode *vp;
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int mode;
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struct ucred *cred;
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struct proc *p;
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{
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int error;
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struct filedesc *fdp;
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struct file *fp;
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int dfd;
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int fd;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_open\n");
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#endif
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/*
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* Can always open the root (modulo perms)
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*/
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if (vp->v_flag & VROOT)
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return (0);
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_open, mode = %x, file = %s\n",
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mode, VTOKERN(vp)->kf_kt->kt_name);
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#endif
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if ((mode & FWRITE) && VTOKERN(vp)->kf_kt->kt_rw != KTM_RW)
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return (EPERM);
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return (0);
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}
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kernfs_getattr(vp, vap, cred, p)
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struct vnode *vp;
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struct vattr *vap;
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struct ucred *cred;
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struct proc *p;
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{
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int error = 0;
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char strbuf[KSTRING];
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struct kern_target *kt = VTOKERN(vp)->kf_kt;
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bzero((caddr_t) vap, sizeof(*vap));
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vattr_null(vap);
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vap->va_uid = 0;
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vap->va_gid = 0;
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vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
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/* vap->va_qsize = 0; */
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vap->va_blocksize = DEV_BSIZE;
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microtime(&vap->va_atime);
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vap->va_mtime = vap->va_atime;
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vap->va_ctime = vap->va_ctime;
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vap->va_gen = 0;
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vap->va_flags = 0;
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vap->va_rdev = 0;
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/* vap->va_qbytes = 0; */
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vap->va_bytes = 0;
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if (vp->v_flag & VROOT) {
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_getattr: stat rootdir\n");
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#endif
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vap->va_type = VDIR;
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vap->va_mode = KTM_DIR_MODE;
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vap->va_nlink = 2;
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vap->va_fileid = 2;
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vap->va_size = DEV_BSIZE;
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} else {
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_getattr: stat target %s\n", kt->kt_name);
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#endif
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vap->va_type = kt->kt_vtype;
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vap->va_mode = (kt->kt_rw ? KTM_RW_MODE : KTM_RO_MODE);
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vap->va_nlink = 1;
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vap->va_fileid = 3 + (kt - kern_targets) / sizeof(*kt);
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error = kernfs_xread(kt, strbuf, sizeof(strbuf), &vap->va_size);
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}
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vp->v_type = vap->va_type;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_getattr: return error %d\n", error);
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#endif
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return (error);
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}
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kernfs_setattr(vp, vap, cred, p)
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struct vnode *vp;
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struct vattr *vap;
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struct ucred *cred;
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struct proc *p;
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{
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/*
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* Silently ignore attribute changes.
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* This allows for open with truncate to have no
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* effect until some data is written. I want to
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* do it this way because all writes are atomic.
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*/
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return (0);
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}
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static int
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kernfs_read(vp, uio, ioflag, cred)
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struct vnode *vp;
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struct uio *uio;
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int ioflag;
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struct ucred *cred;
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{
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struct kern_target *kt = VTOKERN(vp)->kf_kt;
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char strbuf[KSTRING];
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int off = uio->uio_offset;
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int len = 0;
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char *cp = strbuf;
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int error;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kern_read %s\n", kt->kt_name);
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#endif
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error = kernfs_xread(kt, strbuf, sizeof(strbuf), &len);
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if (error)
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return (error);
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cp = strbuf + off;
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len -= off;
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return (uiomove(cp, len, uio));
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}
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static int
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kernfs_write(vp, uio, ioflag, cred)
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struct vnode *vp;
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struct uio *uio;
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int ioflag;
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struct ucred *cred;
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{
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struct kern_target *kt = VTOKERN(vp)->kf_kt;
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char strbuf[KSTRING];
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int len = uio->uio_resid;
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char *cp = strbuf;
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int xlen;
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int error;
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if (uio->uio_offset != 0)
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return (EINVAL);
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xlen = min(uio->uio_resid, KSTRING-1);
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error = uiomove(strbuf, xlen, uio);
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if (error)
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return (error);
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if (uio->uio_resid != 0)
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return (EIO);
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strbuf[xlen] = '\0';
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return (kernfs_xwrite(kt, strbuf, xlen));
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}
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kernfs_readdir(vp, uio, cred, eofflagp)
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struct vnode *vp;
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struct uio *uio;
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struct ucred *cred;
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int *eofflagp;
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{
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struct filedesc *fdp;
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int i;
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int error;
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i = uio->uio_offset / UIO_MX;
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error = 0;
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while (uio->uio_resid > 0) {
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_readdir: i = %d\n", i);
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#endif
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if (i >= nkern_targets) {
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*eofflagp = 1;
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break;
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}
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{
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struct direct d;
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struct direct *dp = &d;
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struct kern_target *kt = &kern_targets[i];
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bzero((caddr_t) dp, UIO_MX);
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dp->d_namlen = strlen(kt->kt_name);
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bcopy(kt->kt_name, dp->d_name, dp->d_namlen+1);
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_readdir: name = %s, len = %d\n",
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dp->d_name, dp->d_namlen);
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#endif
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/*
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* Fill in the remaining fields
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*/
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dp->d_reclen = UIO_MX;
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dp->d_ino = i + 3;
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/*
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* And ship to userland
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*/
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error = uiomove((caddr_t) dp, UIO_MX, uio);
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if (error)
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break;
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}
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i++;
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}
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uio->uio_offset = i * UIO_MX;
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return (error);
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}
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kernfs_inactive(vp, p)
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struct vnode *vp;
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struct proc *p;
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{
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/*
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* Clear out the v_type field to avoid
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* nasty things happening in vgone().
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*/
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vp->v_type = VNON;
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#ifdef KERNFS_DIAGNOSTIC
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printf("kernfs_inactive(%x)\n", vp);
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#endif
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return (0);
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}
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/*
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* Print out the contents of a kernfs vnode.
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*/
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/* ARGSUSED */
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kernfs_print(vp)
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struct vnode *vp;
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{
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printf("tag VT_NON, kernfs vnode\n");
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}
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/*
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* kernfs vnode unsupported operation
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*/
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kernfs_enotsupp()
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{
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return (EOPNOTSUPP);
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}
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/*
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* kernfs "should never get here" operation
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*/
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kernfs_badop()
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{
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panic("kernfs: bad op");
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/* NOTREACHED */
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}
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/*
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* kernfs vnode null operation
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*/
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kernfs_nullop()
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{
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return (0);
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}
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#define kernfs_create ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_mknod ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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struct ucred *cred, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_close ((int (*) __P(( \
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struct vnode *vp, \
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int fflag, \
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struct ucred *cred, \
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struct proc *p))) nullop)
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#define kernfs_access ((int (*) __P(( \
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struct vnode *vp, \
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int mode, \
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struct ucred *cred, \
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struct proc *p))) nullop)
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#define kernfs_ioctl ((int (*) __P(( \
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struct vnode *vp, \
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int command, \
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caddr_t data, \
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int fflag, \
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struct ucred *cred, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_select ((int (*) __P(( \
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struct vnode *vp, \
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int which, \
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int fflags, \
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struct ucred *cred, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_mmap ((int (*) __P(( \
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struct vnode *vp, \
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int fflags, \
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struct ucred *cred, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_fsync ((int (*) __P(( \
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struct vnode *vp, \
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int fflags, \
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struct ucred *cred, \
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int waitfor, \
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struct proc *p))) nullop)
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#define kernfs_seek ((int (*) __P(( \
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struct vnode *vp, \
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off_t oldoff, \
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off_t newoff, \
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struct ucred *cred))) nullop)
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#define kernfs_remove ((int (*) __P(( \
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struct nameidata *ndp, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_link ((int (*) __P(( \
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struct vnode *vp, \
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struct nameidata *ndp, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_rename ((int (*) __P(( \
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struct nameidata *fndp, \
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struct nameidata *tdnp, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_mkdir ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_rmdir ((int (*) __P(( \
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struct nameidata *ndp, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_symlink ((int (*) __P(( \
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struct nameidata *ndp, \
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struct vattr *vap, \
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char *target, \
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struct proc *p))) kernfs_enotsupp)
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#define kernfs_readlink ((int (*) __P(( \
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struct vnode *vp, \
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struct uio *uio, \
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struct ucred *cred))) kernfs_enotsupp)
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#define kernfs_abortop ((int (*) __P(( \
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struct nameidata *ndp))) nullop)
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#ifdef KERNFS_DIAGNOSTIC
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int kernfs_reclaim(vp)
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struct vnode *vp;
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{
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printf("kernfs_reclaim(%x)\n", vp);
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return (0);
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}
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#else
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#define kernfs_reclaim ((int (*) __P(( \
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struct vnode *vp))) nullop)
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#endif
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#define kernfs_lock ((int (*) __P(( \
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struct vnode *vp))) nullop)
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#define kernfs_unlock ((int (*) __P(( \
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struct vnode *vp))) nullop)
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#define kernfs_bmap ((int (*) __P(( \
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struct vnode *vp, \
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daddr_t bn, \
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struct vnode **vpp, \
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daddr_t *bnp))) kernfs_badop)
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#define kernfs_strategy ((int (*) __P(( \
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struct buf *bp))) kernfs_badop)
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#define kernfs_islocked ((int (*) __P(( \
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struct vnode *vp))) nullop)
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#define kernfs_advlock ((int (*) __P(( \
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struct vnode *vp, \
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caddr_t id, \
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int op, \
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struct flock *fl, \
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int flags))) kernfs_enotsupp)
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struct vnodeops kernfs_vnodeops = {
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kernfs_lookup, /* lookup */
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kernfs_create, /* create */
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kernfs_mknod, /* mknod */
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kernfs_open, /* open */
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kernfs_close, /* close */
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kernfs_access, /* access */
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kernfs_getattr, /* getattr */
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kernfs_setattr, /* setattr */
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kernfs_read, /* read */
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kernfs_write, /* write */
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kernfs_ioctl, /* ioctl */
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kernfs_select, /* select */
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kernfs_mmap, /* mmap */
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kernfs_fsync, /* fsync */
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kernfs_seek, /* seek */
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kernfs_remove, /* remove */
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kernfs_link, /* link */
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kernfs_rename, /* rename */
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kernfs_mkdir, /* mkdir */
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kernfs_rmdir, /* rmdir */
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kernfs_symlink, /* symlink */
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kernfs_readdir, /* readdir */
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kernfs_readlink, /* readlink */
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kernfs_abortop, /* abortop */
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kernfs_inactive, /* inactive */
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kernfs_reclaim, /* reclaim */
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kernfs_lock, /* lock */
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kernfs_unlock, /* unlock */
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kernfs_bmap, /* bmap */
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kernfs_strategy, /* strategy */
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kernfs_print, /* print */
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kernfs_islocked, /* islocked */
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kernfs_advlock, /* advlock */
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};
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