xnu-4903.241.1.tar.gz

[apple/xnu.git] / bsd / miscfs / devfs / devfs_fdesc_support.c

/*
 * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 * 
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
/*
 * 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.
 *
 *      @(#)fdesc_vnops.c       8.17 (Berkeley) 5/22/95
 *
 */

/*
 * /dev/fd Filesystem
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/proc_internal.h>
#include <sys/kernel.h> /* boottime */
#include <sys/resourcevar.h>
#include <sys/filedesc.h>
#include <sys/kauth.h>
#include <sys/vnode_internal.h>
#include <sys/malloc.h>
#include <sys/file_internal.h>
#include <sys/stat.h>
#include <sys/mount_internal.h>
#include <sys/namei.h>
#include <sys/dirent.h>
#include <sys/ubc.h>
#include <sys/socketvar.h>
#include <sys/pipe.h>
#include <sys/uio_internal.h>
#include <vfs/vfs_support.h>
#include <pexpert/pexpert.h>
#include <miscfs/devfs/fdesc.h>
#include <miscfs/devfs/devfs.h>
#include <miscfs/devfs/devfsdefs.h>

#define FDL_WANT        0x01
#define FDL_LOCKED      0x02
static int fdcache_lock;


#if (FD_STDIN != FD_STDOUT-1) || (FD_STDOUT != FD_STDERR-1)
FD_STDIN, FD_STDOUT, FD_STDERR must be a sequence n, n+1, n+2
#endif

#define NFDCACHE 3

#define FD_NHASH(ix) \
        (&fdhashtbl[(ix) & fdhash])
LIST_HEAD(fdhashhead, fdescnode) *fdhashtbl;
u_long fdhash;

static int fdesc_attr(int fd, struct vnode_attr *vap, vfs_context_t a_context);

lck_mtx_t fdesc_mtx;
lck_grp_t *fdesc_lckgrp;

static void 
fdesc_lock(void)
{
        lck_mtx_lock(&fdesc_mtx);
}

static void 
fdesc_unlock(void)
{
        lck_mtx_unlock(&fdesc_mtx);
}


/*
 * Initialise cache headers, create the devfs node
 */
int
devfs_fdesc_init()
{
        int error = 0;
        devnode_t *rootdir = dev_root->de_dnp;
        devdirent_t *direntp;
        
        /* XXX Make sure you have the right path... */
        fdhashtbl = hashinit(NFDCACHE, M_CACHE, &fdhash);
        fdesc_lckgrp = lck_grp_alloc_init("fdesc", NULL);
        lck_mtx_init(&fdesc_mtx, fdesc_lckgrp, NULL);

        DEVFS_LOCK();
        dev_add_entry("fd", rootdir, DEV_DEVFD, NULL, NULL, NULL, &direntp);
        devfs_fdesc_makelinks();
        DEVFS_UNLOCK();

        return(error);
}

/*
 * Called during early startup, no need to synchronize
 */
int
devfs_fdesc_makelinks()
{
        int error = 0;
        devdirent_t *stdin_ent = NULL, *stdout_ent = NULL, *stderr_ent = NULL;
        devnode_t *root_devnode = dev_root->de_dnp;

        /* We do this ugliness to get around some "const" warnings */
        char in[] = "stdin";
        char out[] = "stdout";
        char err[] = "stderr";
        char zero[] = "fd/0";
        char one[] = "fd/1";
        char two[] = "fd/2";

        if ((error = devfs_make_symlink(root_devnode, in, 0555, zero, &stdin_ent))) {
                printf("Couldn't make stdin, err %d.\n", error);
                goto bad;
        }

        if ((error = devfs_make_symlink(root_devnode, out, 0555, one, &stdout_ent))) {
                printf("Couldn't make stdout, err %d.\n", error);
                goto bad;
        }

        if ((error = devfs_make_symlink(root_devnode, err, 0555, two, &stderr_ent))) {
                printf("Couldn't make stderr, err %d.\n", error);
                goto bad;
        }
        
        return 0;

bad:
        if (stdin_ent) {
                dev_free_name(stdin_ent);
        }
        if (stdout_ent) {
                dev_free_name(stdout_ent);
        }
        if (stderr_ent) {
                dev_free_name(stderr_ent);
        }

        return error;
}

int
fdesc_allocvp(fdntype ftype, int ix, struct mount *mp, struct vnode **vpp, enum vtype vtype, int fdno)
{
        struct fdhashhead *fc;
        struct fdescnode *fd;
        int error = 0;
        int vid = 0;
        struct vnode_fsparam vfsp;

        fdesc_lock();

        fc = FD_NHASH(ix);
loop:
        for (fd = fc->lh_first; fd != 0; fd = fd->fd_hash.le_next) {
                if (fd->fd_ix == ix && vnode_mount(fd->fd_vnode) == mp) {
                        vid = vnode_vid(fd->fd_vnode);
                        fdesc_unlock();

                        if (vnode_getwithvid(fd->fd_vnode, vid)) {
                                fdesc_lock();
                                goto loop;
                        }

                        *vpp = fd->fd_vnode;
                        (*vpp)->v_type = vtype;

                        return (error);
                }
        }

        /* Only one thread can add to the hash at a time */
        if (fdcache_lock & FDL_LOCKED) {
                fdcache_lock |= FDL_WANT;
                msleep((caddr_t) &fdcache_lock, &fdesc_mtx, PINOD, "fdesc_allocvp", NULL);
                goto loop;
        }

        fdcache_lock |= FDL_LOCKED;
        fdesc_unlock();

        MALLOC(fd, void *, sizeof(struct fdescnode), M_TEMP, M_WAITOK);

        vfsp.vnfs_mp = mp;
        vfsp.vnfs_vtype = vtype;
        vfsp.vnfs_str = "fdesc";
        vfsp.vnfs_dvp = NULL;
        vfsp.vnfs_fsnode = fd;
        vfsp.vnfs_cnp = NULL;
        vfsp.vnfs_vops = fdesc_vnodeop_p;
        vfsp.vnfs_rdev = 0;
        vfsp.vnfs_filesize = 0;
        vfsp.vnfs_flags = VNFS_NOCACHE | VNFS_CANTCACHE;
        vfsp.vnfs_marksystem = 0;
        vfsp.vnfs_markroot = 0;

        error = vnode_create(VNCREATE_FLAVOR, VCREATESIZE, &vfsp, vpp);
        if (error) {
                FREE(fd, M_TEMP);
                fdesc_lock();
                goto out;
        }
        
        (*vpp)->v_tag = VT_FDESC;
        fd->fd_vnode = *vpp;
        fd->fd_type = ftype;
        fd->fd_fd = -1;
        fd->fd_link = NULL;
        fd->fd_ix = ix;
        fd->fd_fd = fdno;
        
        fdesc_lock();

        LIST_INSERT_HEAD(fc, fd, fd_hash);
out:
        /* Hold the lock when we get here */
        fdcache_lock &= ~FDL_LOCKED;

        if (fdcache_lock & FDL_WANT) {
                fdcache_lock &= ~FDL_WANT;
                wakeup((caddr_t) &fdcache_lock);
        }
        
        fdesc_unlock();

        return (error);
}

/*
 * vp is the current namei directory
 * ndp is the name to locate in that directory...
 *
 * This vnop should only be called on the special directory /dev/fd.
 */
int
devfs_devfd_lookup(struct vnop_lookup_args *ap)
{
        struct vnode **vpp = ap->a_vpp;
        struct vnode *dvp = ap->a_dvp;
        struct componentname *cnp = ap->a_cnp;
        char *pname = cnp->cn_nameptr;
        struct proc *p = vfs_context_proc(ap->a_context);
        int numfiles = p->p_fd->fd_nfiles;
        int fd;
        int error;
        struct vnode *fvp;

        if (cnp->cn_namelen == 1 && *pname == '.') {
                *vpp = dvp;
                
                if ( (error = vnode_get(dvp)) ) {
                        return(error);
                }
                return (0);
        }

        fd = 0;
        while (*pname >= '0' && *pname <= '9') {
                fd = 10 * fd + *pname++ - '0';
                if (fd >= numfiles)
                        break;
        }

        if (*pname != '\0') {
                error = ENOENT;
                goto bad;
        }

        if (fd < 0 || fd >= numfiles ||
                        *fdfile(p, fd) == NULL ||
                        (*fdflags(p, fd) & UF_RESERVED)) {
                error = EBADF;
                goto bad;
        }

        error = fdesc_allocvp(Fdesc, FD_DESC+fd, dvp->v_mount, &fvp, VNON, fd);
        if (error)
                goto bad;
        *vpp = fvp;
        return (0);

bad:
        *vpp = NULL;
        return (error);
}

int
fdesc_open(struct vnop_open_args *ap)
{
        struct vnode *vp = ap->a_vp;
        thread_t thr = vfs_context_thread(ap->a_context);
        uthread_t uu;
        int error = 0;

        if (thr == NULL)
                return (EINVAL);

        uu = get_bsdthread_info(thr);

        switch (VTOFDESC(vp)->fd_type) {
        case Fdesc:
                /*
                 * XXX Kludge: set uu->uu_dupfd to contain the value of the
                 * the file descriptor being sought for duplication. The error 
                 * return ensures that the vnode for this device will be
                 * released by vn_open. Open will detect this special error and
                 * take the actions in dupfdopen.  Other callers of vn_open or
                 * vnop_open will simply report the error.
                 */
                uu->uu_dupfd = VTOFDESC(vp)->fd_fd;     /* XXX */
                error = ENODEV;
                break;
        default:        
                panic("Invalid type for fdesc node!");
                break;
        }

        return (error);
}

static int
fdesc_attr(int fd, struct vnode_attr *vap, vfs_context_t a_context)
{
        struct fileproc *fp;
        struct proc *p = vfs_context_proc(a_context);
        struct stat stb;
        int error;

        if ((error = fp_lookup(p, fd, &fp, 0)))
                return (error);
        switch (FILEGLOB_DTYPE(fp->f_fglob)) {
        case DTYPE_VNODE:
                if((error = vnode_getwithref((struct vnode *) fp->f_fglob->fg_data)) != 0) {
                        break;
                }
                if ((error = vnode_authorize((struct vnode *)fp->f_fglob->fg_data,
                         NULL,
                         KAUTH_VNODE_READ_ATTRIBUTES | KAUTH_VNODE_READ_SECURITY,
                         a_context)) == 0)
                        error = vnode_getattr((struct vnode *)fp->f_fglob->fg_data, vap, a_context);
                if (error == 0 && vap->va_type == VDIR) {
                        /*
                         * directories can cause loops in the namespace,
                         * so turn off the 'x' bits to avoid trouble.
                         *
                         * XXX ACLs break this, of course
                         */
                        vap->va_mode &= ~((VEXEC)|(VEXEC>>3)|(VEXEC>>6));
                }
                (void)vnode_put((struct vnode *) fp->f_fglob->fg_data);
                break;

        case DTYPE_SOCKET:
        case DTYPE_PIPE:
#if SOCKETS
                if (FILEGLOB_DTYPE(fp->f_fglob) == DTYPE_SOCKET)
                        error = soo_stat((struct socket *)fp->f_fglob->fg_data, (void *)&stb, 0);
                else
#endif /* SOCKETS */
                        error = pipe_stat((struct pipe *)fp->f_fglob->fg_data, (void *)&stb, 0);

                if (error == 0) {
                        if (FILEGLOB_DTYPE(fp->f_fglob) == DTYPE_SOCKET)
                                VATTR_RETURN(vap, va_type, VSOCK);
                        else
                                VATTR_RETURN(vap, va_type, VFIFO);

                        VATTR_RETURN(vap, va_mode, stb.st_mode);
                        VATTR_RETURN(vap, va_nlink, stb.st_nlink);
                        VATTR_RETURN(vap, va_uid, stb.st_uid);
                        VATTR_RETURN(vap, va_gid, stb.st_gid);
                        VATTR_RETURN(vap, va_fsid, stb.st_dev);
                        VATTR_RETURN(vap, va_fileid, stb.st_ino);
                        VATTR_RETURN(vap, va_data_size, stb.st_size);
                        VATTR_RETURN(vap, va_access_time, stb.st_atimespec);
                        VATTR_RETURN(vap, va_modify_time, stb.st_mtimespec);
                        VATTR_RETURN(vap, va_change_time, stb.st_ctimespec);
                        VATTR_RETURN(vap, va_gen, stb.st_gen);
                        VATTR_RETURN(vap, va_flags, stb.st_flags);
                        VATTR_RETURN(vap, va_rdev, stb.st_rdev);
                        VATTR_RETURN(vap, va_total_alloc, stb.st_blocks * stb.st_blksize);
                        VATTR_RETURN(vap, va_acl, NULL);
                }
                break;

        default:
                error = EBADF;
        }

        fp_drop(p, fd, fp, 0);
        return (error);
}

int
fdesc_getattr(struct vnop_getattr_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct vnode_attr *vap = ap->a_vap;
        unsigned fd;
        int error = 0;

        switch (VTOFDESC(vp)->fd_type) {
        case Fdesc:
                fd = VTOFDESC(vp)->fd_fd;
                error = fdesc_attr(fd, vap, ap->a_context);
                break;

        default:
                panic("Invalid type for an fdesc node!\n");
                break;  
        }
        
        /* 
         * Yes, we do this without locking, but this value is always just
         * a snapshot.
         */
        if (error == 0) {
                vp->v_type = vap->va_type;
                
                /* We need an inactive to reset type to VNON */
                vnode_setneedinactive(vp);
        }

        return (error);
}

int
fdesc_setattr(struct vnop_setattr_args *ap)
{
        struct fileproc *fp;
        unsigned fd;
        int error;
        struct proc * p = vfs_context_proc(ap->a_context);

        /*
         * Can't mess with the root vnode
         */
        switch (VTOFDESC(ap->a_vp)->fd_type) {
        case Fdesc:
                break;
        default:
                panic("Invalid type for an fdesc node!\n");
                return (EACCES);
        }

        fd = VTOFDESC(ap->a_vp)->fd_fd;
        if ((error = fp_lookup(vfs_context_proc(ap->a_context), fd, &fp, 0)))
                return (error);

        /*
         * Can setattr the underlying vnode, but not sockets!
         */
        switch (FILEGLOB_DTYPE(fp->f_fglob)) {
        case DTYPE_VNODE:
        {
                if ((error = vnode_getwithref((struct vnode *) fp->f_fglob->fg_data)) != 0)
                        break;
                error = vnode_setattr((struct vnode *) fp->f_fglob->fg_data, ap->a_vap, ap->a_context);
                (void)vnode_put((struct vnode *) fp->f_fglob->fg_data);
                break;
        }

        case DTYPE_SOCKET:
        case DTYPE_PIPE:
                error = 0;
                break;

        default:
                error = EBADF;
                break;
        }

        fp_drop(p, fd, fp, 0);
        return (error);
}

#define UIO_MX 16

/*
static struct dirtmp {
        u_int32_t d_fileno;
        u_short d_reclen;
        u_short d_namlen;
        char d_name[8];
} rootent[] = {
        { FD_DEVFD, UIO_MX, 2, "fd" },
        { FD_STDIN, UIO_MX, 5, "stdin" },
        { FD_STDOUT, UIO_MX, 6, "stdout" },
        { FD_STDERR, UIO_MX, 6, "stderr" },
        { 0, 0, 0, "" }
};
*/

/* Only called on /dev/fd */
int
devfs_devfd_readdir(struct vnop_readdir_args *ap)
{
        struct uio *uio = ap->a_uio;
        struct proc *p = current_proc();
        int i, error;

        /*
         * We don't allow exporting fdesc mounts, and currently local
         * requests do not need cookies.
         */
        if (ap->a_flags & (VNODE_READDIR_EXTENDED | VNODE_READDIR_REQSEEKOFF))
                return (EINVAL);

        /*
         * There needs to be space for at least one entry.
         */
        if (uio_resid(uio) < UIO_MX)
                return (EINVAL);

        i = uio->uio_offset / UIO_MX;
        error = 0;
        while (uio_resid(uio) >= UIO_MX) {
                if (i >= p->p_fd->fd_nfiles)
                        break;

                if (*fdfile(p, i) != NULL && !(*fdflags(p, i) & UF_RESERVED)) {
                        struct dirent d;
                        struct dirent *dp = &d;

                        bzero((caddr_t) dp, UIO_MX);

                        dp->d_namlen = snprintf(dp->d_name, sizeof(dp->d_name),
                                                "%d", i);
                        dp->d_reclen = UIO_MX;
                        dp->d_type = DT_UNKNOWN;
                        dp->d_fileno = i + FD_STDIN;
                        /*
                         * And ship to userland
                         */
                        error = uiomove((caddr_t) dp, UIO_MX, uio);
                        if (error)
                                break;
                }
                i++;
        }

        uio->uio_offset = i * UIO_MX;
        return (error);
}

int
fdesc_read(__unused struct vnop_read_args *ap)
{
        return (ENOTSUP);
}

int
fdesc_write(__unused struct vnop_write_args *ap)
{
        return (ENOTSUP);
}

int
fdesc_ioctl(__unused struct vnop_ioctl_args *ap)
{
        return (ENOTSUP);
}

int
fdesc_select(__unused struct vnop_select_args *ap)
{
        return (ENOTSUP);
}

int
fdesc_inactive(struct vnop_inactive_args *ap)
{
        struct vnode *vp = ap->a_vp;

        /*
         * Clear out the v_type field to avoid
         * nasty things happening in vgone().
         */
        vp->v_type = VNON;

        return (0);
}

int
fdesc_reclaim(struct vnop_reclaim_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct fdescnode *fd = VTOFDESC(vp);

        fdesc_lock();

        LIST_REMOVE(fd, fd_hash);
        FREE(vp->v_data, M_TEMP);
        vp->v_data = NULL;
        
        fdesc_unlock();

        return (0);
}

/*
 * Return POSIX pathconf information applicable to special devices.
 */
int
fdesc_pathconf(struct vnop_pathconf_args *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 = 200112;         /* _POSIX_CHOWN_RESTRICTED */
                return (0);
        case _PC_VDISABLE:
                *ap->a_retval = _POSIX_VDISABLE;
                return (0);
        default:
                return (EINVAL);
        }
        /* NOTREACHED */
}

/*
 * /dev/fd "should never get here" operation
 */
int
fdesc_badop(void)
{

        return (ENOTSUP);
        /* NOTREACHED */
}

#define VOPFUNC int (*)(void *)

#define fdesc_create (int (*) (struct  vnop_create_args *))eopnotsupp
#define fdesc_mknod (int (*) (struct  vnop_mknod_args *))eopnotsupp
#define fdesc_close (int (*) (struct  vnop_close_args *))nullop
#define fdesc_access (int (*) (struct  vnop_access_args *))nullop
#define fdesc_mmap (int (*) (struct  vnop_mmap_args *))eopnotsupp
#define fdesc_revoke nop_revoke
#define fdesc_fsync (int (*) (struct  vnop_fsync_args *))nullop
#define fdesc_remove (int (*) (struct  vnop_remove_args *))eopnotsupp
#define fdesc_link (int (*) (struct  vnop_link_args *))eopnotsupp
#define fdesc_rename (int (*) (struct  vnop_rename_args *))eopnotsupp
#define fdesc_mkdir (int (*) (struct  vnop_mkdir_args *))eopnotsupp
#define fdesc_rmdir (int (*) (struct  vnop_rmdir_args *))eopnotsupp
#define fdesc_symlink (int (*) (struct vnop_symlink_args *))eopnotsupp
#define fdesc_strategy (int (*) (struct  vnop_strategy_args *))fdesc_badop
#define fdesc_advlock (int (*) (struct vnop_advlock_args *))eopnotsupp
#define fdesc_bwrite (int (*) (struct  vnop_bwrite_args *))eopnotsupp
#define fdesc_blktooff (int (*) (struct  vnop_blktooff_args *))eopnotsupp
#define fdesc_offtoblk (int (*) (struct  vnop_offtoblk_args *))eopnotsupp
#define fdesc_blockmap (int (*) (struct  vnop_blockmap_args *))eopnotsupp

int (**fdesc_vnodeop_p)(void *);
struct vnodeopv_entry_desc devfs_fdesc_vnodeop_entries[] = {
        { &vnop_default_desc, (VOPFUNC)vn_default_error },
        { &vnop_lookup_desc, (VOPFUNC)vn_default_error},        /* lookup */
        { &vnop_create_desc, (VOPFUNC)fdesc_create },   /* create */
        { &vnop_mknod_desc, (VOPFUNC)fdesc_mknod },     /* mknod */
        { &vnop_open_desc, (VOPFUNC)fdesc_open },       /* open */
        { &vnop_close_desc, (VOPFUNC)fdesc_close },     /* close */
        { &vnop_access_desc, (VOPFUNC)fdesc_access },   /* access */
        { &vnop_getattr_desc, (VOPFUNC)fdesc_getattr }, /* getattr */
        { &vnop_setattr_desc, (VOPFUNC)fdesc_setattr }, /* setattr */
        { &vnop_read_desc, (VOPFUNC)fdesc_read },       /* read */
        { &vnop_write_desc, (VOPFUNC)fdesc_write },     /* write */
        { &vnop_ioctl_desc, (VOPFUNC)fdesc_ioctl },     /* ioctl */
        { &vnop_select_desc, (VOPFUNC)fdesc_select },   /* select */
        { &vnop_revoke_desc, (VOPFUNC)fdesc_revoke },   /* revoke */
        { &vnop_mmap_desc, (VOPFUNC)fdesc_mmap },       /* mmap */
        { &vnop_fsync_desc, (VOPFUNC)fdesc_fsync },     /* fsync */
        { &vnop_remove_desc, (VOPFUNC)fdesc_remove },   /* remove */
        { &vnop_link_desc, (VOPFUNC)fdesc_link },       /* link */
        { &vnop_rename_desc, (VOPFUNC)fdesc_rename },   /* rename */
        { &vnop_mkdir_desc, (VOPFUNC)fdesc_mkdir },     /* mkdir */
        { &vnop_rmdir_desc, (VOPFUNC)fdesc_rmdir },     /* rmdir */
        { &vnop_symlink_desc, (VOPFUNC)fdesc_symlink }, /* symlink */
        { &vnop_readdir_desc, (VOPFUNC)vn_default_error},/* readdir */
        { &vnop_readlink_desc, (VOPFUNC)err_readlink}, /* readlink */
        { &vnop_inactive_desc, (VOPFUNC)fdesc_inactive },/* inactive */
        { &vnop_reclaim_desc, (VOPFUNC)fdesc_reclaim }, /* reclaim */
        { &vnop_strategy_desc, (VOPFUNC)fdesc_strategy },       /* strategy */
        { &vnop_pathconf_desc, (VOPFUNC)fdesc_pathconf },       /* pathconf */
        { &vnop_advlock_desc, (VOPFUNC)fdesc_advlock }, /* advlock */
        { &vnop_bwrite_desc, (VOPFUNC)fdesc_bwrite },   /* bwrite */
        { &vnop_pagein_desc, (VOPFUNC)err_pagein },     /* pagein */
        { &vnop_pageout_desc, (VOPFUNC)err_pageout },   /* pageout */
        { &vnop_copyfile_desc, (VOPFUNC)err_copyfile }, /* Copyfile */
        { &vnop_blktooff_desc, (VOPFUNC)fdesc_blktooff },       /* blktooff */
        { &vnop_blktooff_desc, (VOPFUNC)fdesc_offtoblk },       /* offtoblk */
        { &vnop_blockmap_desc, (VOPFUNC)fdesc_blockmap },       /* blockmap */
        { (struct vnodeop_desc*)NULL, (VOPFUNC)NULL }
};

struct vnodeopv_desc devfs_fdesc_vnodeop_opv_desc =
        { &fdesc_vnodeop_p, devfs_fdesc_vnodeop_entries };