usr/src/sys/miscfs/kernfs/kernfs_vnops.c

/*
 * Copyright (c) 1992, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software donated to Berkeley by
 * Jan-Simon Pendry.
 *
 * 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 University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 *
 *      @(#)kernfs_vnops.c      8.6 (Berkeley) 2/10/94
 */

/*
 * Kernel parameter filesystem (/kern)
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/vmmeter.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/buf.h>
#include <sys/dirent.h>
#include <miscfs/kernfs/kernfs.h>

#define KSTRING 256             /* Largest I/O available via this filesystem */
#define UIO_MX 32

#define READ_MODE       (S_IRUSR|S_IRGRP|S_IROTH)
#define WRITE_MODE      (S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH)
#define DIR_MODE        (S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)

struct kern_target {
        char *kt_name;
        void *kt_data;
#define KTT_NULL 1
#define KTT_TIME 5
#define KTT_INT 17
#define KTT_STRING 31
#define KTT_HOSTNAME 47
#define KTT_AVENRUN 53
        int kt_tag;
        int kt_rw;
        int kt_vtype;
} kern_targets[] = {
/* NOTE: The name must be less than UIO_MX-16 chars in length */
        /* name         data            tag             ro/rw */
        { ".",          0,              KTT_NULL,       VREAD,          VDIR },
        { "..",         0,              KTT_NULL,       VREAD,          VDIR },
        { "boottime",   &boottime.tv_sec, KTT_INT,      VREAD,          VREG },
        { "copyright",  copyright,      KTT_STRING,     VREAD,          VREG },
        { "hostname",   0,              KTT_HOSTNAME,   VREAD|VWRITE,   VREG },
        { "hz",         &hz,            KTT_INT,        VREAD,          VREG },
        { "loadavg",    0,              KTT_AVENRUN,    VREAD,          VREG },
        { "pagesize",   &cnt.v_page_size, KTT_INT,      VREAD,          VREG },
        { "physmem",    &physmem,       KTT_INT,        VREAD,          VREG },
#if 0
        { "root",       0,              KTT_NULL,       VREAD,          VDIR },
#endif
        { "rootdev",    0,              KTT_NULL,       VREAD,          VBLK },
        { "rrootdev",   0,              KTT_NULL,       VREAD,          VCHR },
        { "time",       0,              KTT_TIME,       VREAD,          VREG },
        { "version",    version,        KTT_STRING,     VREAD,          VREG },
};

static int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]);

static int
kernfs_xread(kt, buf, len, lenp)
        struct kern_target *kt;
        char *buf;
        int len;
        int *lenp;
{
        switch (kt->kt_tag) {
        case KTT_TIME: {
                struct timeval tv;
                microtime(&tv);
                sprintf(buf, "%d %d\n", tv.tv_sec, tv.tv_usec);
                break;
        }

        case KTT_INT: {
                int *ip = kt->kt_data;
                sprintf(buf, "%d\n", *ip);
                break;
        }

        case KTT_STRING: {
                char *cp = kt->kt_data;
                int xlen = strlen(cp) + 1;

                if (xlen >= len)
                        return (EINVAL);

                bcopy(cp, buf, xlen);
                break;
        }

        case KTT_HOSTNAME: {
                char *cp = hostname;
                int xlen = hostnamelen;

                if (xlen >= (len-2))
                        return (EINVAL);

                bcopy(cp, buf, xlen);
                buf[xlen] = '\n';
                buf[xlen+1] = '\0';
                break;
        }

        case KTT_AVENRUN:
                sprintf(buf, "%ld %ld %ld %ld\n",
                                averunnable.ldavg[0],
                                averunnable.ldavg[1],
                                averunnable.ldavg[2],
                                averunnable.fscale);
                break;

        default:
                return (EINVAL);
        }

        *lenp = strlen(buf);
        return (0);
}

static int
kernfs_xwrite(kt, buf, len)
        struct kern_target *kt;
        char *buf;
        int len;
{
        switch (kt->kt_tag) {
        case KTT_HOSTNAME: {
                if (buf[len-1] == '\n')
                        --len;
                bcopy(buf, hostname, len);
                hostname[len] = '\0';
                hostnamelen = len;
                return (0);
        }

        default:
                return (EIO);
        }
}


/*
 * vp is the current namei directory
 * ndp is the name to locate in that directory...
 */
kernfs_lookup(ap)
        struct vop_lookup_args /* {
                struct vnode * a_dvp;
                struct vnode ** a_vpp;
                struct componentname * a_cnp;
        } */ *ap;
{
        struct vnode **vpp = ap->a_vpp;
        struct vnode *dvp = ap->a_dvp;
        struct componentname *cnp = ap->a_cnp;
        struct vnode *fvp;
        int error, i;
        char *pname;

#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_lookup(%x)\n", ap);
        printf("kernfs_lookup(dp = %x, vpp = %x, cnp = %x)\n", dvp, vpp, ap->a_cnp);
#endif
        pname = cnp->cn_nameptr;
#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_lookup(%s)\n", pname);
#endif
        if (cnp->cn_namelen == 1 && *pname == '.') {
                *vpp = dvp;
                VREF(dvp);
                /*VOP_LOCK(dvp);*/
                return (0);
        }

#if 0
        if (cnp->cn_namelen == 4 && bcmp(pname, "root", 4) == 0) {
                *vpp = rootdir;
                VREF(rootdir);
                VOP_LOCK(rootdir);
                return (0);
        }
#endif

        /*
         * /kern/rootdev is the root device
         */
        if (cnp->cn_namelen == 7 && bcmp(pname, "rootdev", 7) == 0) {
                *vpp = rootvp;
                VREF(rootvp);
                VOP_LOCK(rootvp);
                return (0);
        }

        /*
         * /kern/rrootdev is the raw root device
         */
        if (cnp->cn_namelen == 8 && bcmp(pname, "rrootdev", 8) == 0) {
                if (rrootvp) {
                        *vpp = rrootvp;
                        VREF(rrootvp);
                        VOP_LOCK(rrootvp);
                        return (0);
                }
                error = ENXIO;
                goto bad;
        }

        error = ENOENT;

        for (i = 0; i < nkern_targets; i++) {
                struct kern_target *kt = &kern_targets[i];
                if (cnp->cn_namelen == strlen(kt->kt_name) &&
                    bcmp(kt->kt_name, pname, cnp->cn_namelen) == 0) {
                        error = 0;
                        break;
                }
        }

#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_lookup: i = %d, error = %d\n", i, error);
#endif

        if (error)
                goto bad;

#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_lookup: allocate new vnode\n");
#endif
        error = getnewvnode(VT_KERNFS, dvp->v_mount, kernfs_vnodeop_p, &fvp);
        if (error)
                goto bad;
        MALLOC(fvp->v_data, void *, sizeof(struct kernfs_node), M_TEMP, M_WAITOK);
        VTOKERN(fvp)->kf_kt = &kern_targets[i];
        fvp->v_type = VTOKERN(fvp)->kf_kt->kt_vtype;
        *vpp = fvp;
#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_lookup: newvp = %x\n", fvp);
#endif
        return (0);

bad:;
        *vpp = NULL;
#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_lookup: error = %d\n", error);
#endif
        return (error);
}

kernfs_open(ap)
        struct vop_open_args /* {
                struct vnode *a_vp;
                int  a_mode;
                struct ucred *a_cred;
                struct proc *a_p;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;

        /*
         * Can always open the root (modulo perms)
         */
        if (vp->v_flag & VROOT)
                return (0);

#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_open, mode = %x, file = %s\n",
                        ap->a_mode, VTOKERN(vp)->kf_kt->kt_name);
#endif

        if ((ap->a_mode & FWRITE) && !(VTOKERN(vp)->kf_kt->kt_rw & VWRITE))
                return (EOPNOTSUPP);

        return (0);
}

static int
kernfs_access(ap)
        struct vop_access_args /* {
                struct vnode *a_vp;
                int  a_mode;
                struct ucred *a_cred;
                struct proc *a_p;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
        struct ucred *cred = ap->a_cred;
        mode_t mode = ap->a_mode;

        if (mode & VEXEC) {
                if (vp->v_flag & VROOT)
                        return (0);
                return (EACCES);
        }

        if (cred->cr_uid == 0) {
                if ((vp->v_flag & VROOT) == 0) {
                        struct kern_target *kt = VTOKERN(vp)->kf_kt;

                        if ((mode & VWRITE) && !(kt->kt_rw & VWRITE))
                                return (EROFS);
                }
                return (0);
        }

        if (mode & VWRITE)
                return (EACCES);

        return (0);
}


kernfs_getattr(ap)
        struct vop_getattr_args /* {
                struct vnode *a_vp;
                struct vattr *a_vap;
                struct ucred *a_cred;
                struct proc *a_p;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
        struct vattr *vap = ap->a_vap;
        int error = 0;
        char strbuf[KSTRING];

        bzero((caddr_t) vap, sizeof(*vap));
        vattr_null(vap);
        vap->va_uid = 0;
        vap->va_gid = 0;
        vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
        /* vap->va_qsize = 0; */
        vap->va_blocksize = DEV_BSIZE;
        microtime(&vap->va_atime);
        vap->va_mtime = vap->va_atime;
        vap->va_ctime = vap->va_ctime;
        vap->va_gen = 0;
        vap->va_flags = 0;
        vap->va_rdev = 0;
        /* vap->va_qbytes = 0; */
        vap->va_bytes = 0;

        if (vp->v_flag & VROOT) {
#ifdef KERNFS_DIAGNOSTIC
                printf("kernfs_getattr: stat rootdir\n");
#endif
                vap->va_type = VDIR;
                vap->va_mode = DIR_MODE;
                vap->va_nlink = 2;
                vap->va_fileid = 2;
                vap->va_size = DEV_BSIZE;
        } else {
                struct kern_target *kt = VTOKERN(vp)->kf_kt;
                int nbytes;
#ifdef KERNFS_DIAGNOSTIC
                printf("kernfs_getattr: stat target %s\n", kt->kt_name);
#endif
                vap->va_type = kt->kt_vtype;
                vap->va_mode = (kt->kt_rw & VWRITE ? WRITE_MODE : READ_MODE);
                vap->va_nlink = 1;
                vap->va_fileid = 3 + (kt - kern_targets) / sizeof(*kt);
                error = kernfs_xread(kt, strbuf, sizeof(strbuf), &nbytes);
                vap->va_size = nbytes;
        }

        vp->v_type = vap->va_type;
#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_getattr: return error %d\n", error);
#endif
        return (error);
}

kernfs_setattr(ap)
        struct vop_setattr_args /* {
                struct vnode *a_vp;
                struct vattr *a_vap;
                struct ucred *a_cred;
                struct proc *a_p;
        } */ *ap;
{

        /*
         * Silently ignore attribute changes.
         * This allows for open with truncate to have no
         * effect until some data is written.  I want to
         * do it this way because all writes are atomic.
         */
        return (0);
}

static int
kernfs_read(ap)
        struct vop_read_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int  a_ioflag;
                struct ucred *a_cred;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
        struct uio *uio = ap->a_uio;
        struct kern_target *kt;
        char strbuf[KSTRING];
        int off = uio->uio_offset;
        int error, len;
        char *cp;

        if (vp->v_flag & VROOT)
                return (EOPNOTSUPP);

        kt = VTOKERN(vp)->kf_kt;

#ifdef KERNFS_DIAGNOSTIC
        printf("kern_read %s\n", kt->kt_name);
#endif

        len = 0;
        error = kernfs_xread(kt, strbuf, sizeof(strbuf), &len);
        if (error)
                return (error);
        cp = strbuf + off;
        len -= off;
        return (uiomove(cp, len, uio));
}

static int
kernfs_write(ap)
        struct vop_write_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                int  a_ioflag;
                struct ucred *a_cred;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
        struct uio *uio = ap->a_uio;
        struct kern_target *kt;
        int error, xlen;
        char strbuf[KSTRING];

        if (vp->v_flag & VROOT)
                return (0);

        kt = VTOKERN(vp)->kf_kt;

        if (uio->uio_offset != 0)
                return (EINVAL);

        xlen = min(uio->uio_resid, KSTRING-1);
        error = uiomove(strbuf, xlen, uio);
        if (error)
                return (error);

        if (uio->uio_resid != 0)
                return (EIO);

        strbuf[xlen] = '\0';
        xlen = strlen(strbuf);
        return (kernfs_xwrite(kt, strbuf, xlen));
}


kernfs_readdir(ap)
        struct vop_readdir_args /* {
                struct vnode *a_vp;
                struct uio *a_uio;
                struct ucred *a_cred;
        } */ *ap;
{
        struct uio *uio = ap->a_uio;
        int i;
        int error;

        i = uio->uio_offset / UIO_MX;
        error = 0;
        while (uio->uio_resid > 0 && i < nkern_targets) {
                struct dirent d;
                struct dirent *dp = &d;
                struct kern_target *kt = &kern_targets[i];
#ifdef KERNFS_DIAGNOSTIC
                printf("kernfs_readdir: i = %d\n", i);
#endif

                bzero((caddr_t) dp, UIO_MX);

                dp->d_namlen = strlen(kt->kt_name);
                bcopy(kt->kt_name, dp->d_name, dp->d_namlen+1);

#ifdef KERNFS_DIAGNOSTIC
                printf("kernfs_readdir: name = %s, len = %d\n",
                                dp->d_name, dp->d_namlen);
#endif
                /*
                 * Fill in the remaining fields
                 */
                dp->d_reclen = UIO_MX;
                dp->d_fileno = i + 3;
                dp->d_type = DT_UNKNOWN;        /* XXX */
                /*
                 * And ship to userland
                 */
                error = uiomove((caddr_t) dp, UIO_MX, uio);
                if (error)
                        break;
                i++;
        }

        uio->uio_offset = i * UIO_MX;

        return (error);
}

kernfs_inactive(ap)
        struct vop_inactive_args /* {
                struct vnode *a_vp;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;

        /*
         * Clear out the v_type field to avoid
         * nasty things happening in vgone().
         */
        vp->v_type = VNON;
#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_inactive(%x)\n", vp);
#endif
        return (0);
}

kernfs_reclaim(ap)
        struct vop_reclaim_args /* {
                struct vnode *a_vp;
        } */ *ap;
{
        struct vnode *vp = ap->a_vp;
#ifdef KERNFS_DIAGNOSTIC
        printf("kernfs_reclaim(%x)\n", vp);
#endif
        if (vp->v_data) {
                FREE(vp->v_data, M_TEMP);
                vp->v_data = 0;
        }
        return (0);
}

/*
 * Return POSIX pathconf information applicable to special devices.
 */
kernfs_pathconf(ap)
        struct vop_pathconf_args /* {
                struct vnode *a_vp;
                int a_name;
                int *a_retval;
        } */ *ap;
{

        switch (ap->a_name) {
        case _PC_LINK_MAX:
                *ap->a_retval = LINK_MAX;
                return (0);
        case _PC_MAX_CANON:
                *ap->a_retval = MAX_CANON;
                return (0);
        case _PC_MAX_INPUT:
                *ap->a_retval = MAX_INPUT;
                return (0);
        case _PC_PIPE_BUF:
                *ap->a_retval = PIPE_BUF;
                return (0);
        case _PC_CHOWN_RESTRICTED:
                *ap->a_retval = 1;
                return (0);
        case _PC_VDISABLE:
                *ap->a_retval = _POSIX_VDISABLE;
                return (0);
        default:
                return (EINVAL);
        }
        /* NOTREACHED */
}

/*
 * Print out the contents of a /dev/fd vnode.
 */
/* ARGSUSED */
kernfs_print(ap)
        struct vop_print_args /* {
                struct vnode *a_vp;
        } */ *ap;
{

        printf("tag VT_KERNFS, kernfs vnode\n");
        return (0);
}

/*void*/
kernfs_vfree(ap)
        struct vop_vfree_args /* {
                struct vnode *a_pvp;
                ino_t a_ino;
                int a_mode;
        } */ *ap;
{

        return (0);
}

/*
 * /dev/fd vnode unsupported operation
 */
kernfs_enotsupp()
{

        return (EOPNOTSUPP);
}

/*
 * /dev/fd "should never get here" operation
 */
kernfs_badop()
{

        panic("kernfs: bad op");
        /* NOTREACHED */
}

/*
 * kernfs vnode null operation
 */
kernfs_nullop()
{

        return (0);
}

#define kernfs_create ((int (*) __P((struct  vop_create_args *)))kernfs_enotsupp)
#define kernfs_mknod ((int (*) __P((struct  vop_mknod_args *)))kernfs_enotsupp)
#define kernfs_close ((int (*) __P((struct  vop_close_args *)))nullop)
#define kernfs_ioctl ((int (*) __P((struct  vop_ioctl_args *)))kernfs_enotsupp)
#define kernfs_select ((int (*) __P((struct  vop_select_args *)))kernfs_enotsupp)
#define kernfs_mmap ((int (*) __P((struct  vop_mmap_args *)))kernfs_enotsupp)
#define kernfs_fsync ((int (*) __P((struct  vop_fsync_args *)))nullop)
#define kernfs_seek ((int (*) __P((struct  vop_seek_args *)))nullop)
#define kernfs_remove ((int (*) __P((struct  vop_remove_args *)))kernfs_enotsupp)
#define kernfs_link ((int (*) __P((struct  vop_link_args *)))kernfs_enotsupp)
#define kernfs_rename ((int (*) __P((struct  vop_rename_args *)))kernfs_enotsupp)
#define kernfs_mkdir ((int (*) __P((struct  vop_mkdir_args *)))kernfs_enotsupp)
#define kernfs_rmdir ((int (*) __P((struct  vop_rmdir_args *)))kernfs_enotsupp)
#define kernfs_symlink ((int (*) __P((struct vop_symlink_args *)))kernfs_enotsupp)
#define kernfs_readlink \
        ((int (*) __P((struct  vop_readlink_args *)))kernfs_enotsupp)
#define kernfs_abortop ((int (*) __P((struct  vop_abortop_args *)))nullop)
#define kernfs_lock ((int (*) __P((struct  vop_lock_args *)))nullop)
#define kernfs_unlock ((int (*) __P((struct  vop_unlock_args *)))nullop)
#define kernfs_bmap ((int (*) __P((struct  vop_bmap_args *)))kernfs_badop)
#define kernfs_strategy ((int (*) __P((struct  vop_strategy_args *)))kernfs_badop)
#define kernfs_islocked ((int (*) __P((struct  vop_islocked_args *)))nullop)
#define kernfs_advlock ((int (*) __P((struct vop_advlock_args *)))kernfs_enotsupp)
#define kernfs_blkatoff \
        ((int (*) __P((struct  vop_blkatoff_args *)))kernfs_enotsupp)
#define kernfs_valloc ((int(*) __P(( \
                struct vnode *pvp, \
                int mode, \
                struct ucred *cred, \
                struct vnode **vpp))) kernfs_enotsupp)
#define kernfs_truncate \
        ((int (*) __P((struct  vop_truncate_args *)))kernfs_enotsupp)
#define kernfs_update ((int (*) __P((struct  vop_update_args *)))kernfs_enotsupp)
#define kernfs_bwrite ((int (*) __P((struct  vop_bwrite_args *)))kernfs_enotsupp)

int (**kernfs_vnodeop_p)();
struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = {
        { &vop_default_desc, vn_default_error },
        { &vop_lookup_desc, kernfs_lookup },    /* lookup */
        { &vop_create_desc, kernfs_create },    /* create */
        { &vop_mknod_desc, kernfs_mknod },      /* mknod */
        { &vop_open_desc, kernfs_open },        /* open */
        { &vop_close_desc, kernfs_close },      /* close */
        { &vop_access_desc, kernfs_access },    /* access */
        { &vop_getattr_desc, kernfs_getattr },  /* getattr */
        { &vop_setattr_desc, kernfs_setattr },  /* setattr */
        { &vop_read_desc, kernfs_read },        /* read */
        { &vop_write_desc, kernfs_write },      /* write */
        { &vop_ioctl_desc, kernfs_ioctl },      /* ioctl */
        { &vop_select_desc, kernfs_select },    /* select */
        { &vop_mmap_desc, kernfs_mmap },        /* mmap */
        { &vop_fsync_desc, kernfs_fsync },      /* fsync */
        { &vop_seek_desc, kernfs_seek },        /* seek */
        { &vop_remove_desc, kernfs_remove },    /* remove */
        { &vop_link_desc, kernfs_link },        /* link */
        { &vop_rename_desc, kernfs_rename },    /* rename */
        { &vop_mkdir_desc, kernfs_mkdir },      /* mkdir */
        { &vop_rmdir_desc, kernfs_rmdir },      /* rmdir */
        { &vop_symlink_desc, kernfs_symlink },  /* symlink */
        { &vop_readdir_desc, kernfs_readdir },  /* readdir */
        { &vop_readlink_desc, kernfs_readlink },/* readlink */
        { &vop_abortop_desc, kernfs_abortop },  /* abortop */
        { &vop_inactive_desc, kernfs_inactive },/* inactive */
        { &vop_reclaim_desc, kernfs_reclaim },  /* reclaim */
        { &vop_lock_desc, kernfs_lock },        /* lock */
        { &vop_unlock_desc, kernfs_unlock },    /* unlock */
        { &vop_bmap_desc, kernfs_bmap },        /* bmap */
        { &vop_strategy_desc, kernfs_strategy },/* strategy */
        { &vop_print_desc, kernfs_print },      /* print */
        { &vop_islocked_desc, kernfs_islocked },/* islocked */
        { &vop_pathconf_desc, kernfs_pathconf },/* pathconf */
        { &vop_advlock_desc, kernfs_advlock },  /* advlock */
        { &vop_blkatoff_desc, kernfs_blkatoff },/* blkatoff */
        { &vop_valloc_desc, kernfs_valloc },    /* valloc */
        { &vop_vfree_desc, kernfs_vfree },      /* vfree */
        { &vop_truncate_desc, kernfs_truncate },/* truncate */
        { &vop_update_desc, kernfs_update },    /* update */
        { &vop_bwrite_desc, kernfs_bwrite },    /* bwrite */
        { (struct vnodeop_desc*)NULL, (int(*)())NULL }
};
struct vnodeopv_desc kernfs_vnodeop_opv_desc =
        { &kernfs_vnodeop_p, kernfs_vnodeop_entries };