/* $NetBSD: fdesc_vnops.c,v 1.130.4.1 2021/05/03 09:03:22 martin Exp $ */ /* * 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. 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 * * #Id: fdesc_vnops.c,v 1.12 1993/04/06 16:17:17 jsp Exp # */ /* * /dev/fd Filesystem */ #include __KERNEL_RCSID(0, "$NetBSD: fdesc_vnops.c,v 1.130.4.1 2021/05/03 09:03:22 martin Exp $"); #include #include #include #include #include /* boottime */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define cttyvp(p) ((p)->p_lflag & PL_CONTROLT ? (p)->p_session->s_ttyvp : NULL) dev_t devctty; #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 int fdesc_lookup(void *); #define fdesc_create genfs_eopnotsupp #define fdesc_mknod genfs_eopnotsupp int fdesc_open(void *); #define fdesc_close genfs_nullop #define fdesc_access genfs_nullop int fdesc_getattr(void *); int fdesc_setattr(void *); int fdesc_read(void *); int fdesc_write(void *); int fdesc_ioctl(void *); int fdesc_poll(void *); int fdesc_kqfilter(void *); #define fdesc_mmap genfs_eopnotsupp #define fdesc_fcntl genfs_fcntl #define fdesc_fsync genfs_nullop #define fdesc_seek genfs_seek #define fdesc_remove genfs_eopnotsupp int fdesc_link(void *); #define fdesc_rename genfs_eopnotsupp #define fdesc_mkdir genfs_eopnotsupp #define fdesc_rmdir genfs_eopnotsupp int fdesc_symlink(void *); int fdesc_readdir(void *); int fdesc_readlink(void *); #define fdesc_abortop genfs_abortop int fdesc_inactive(void *); int fdesc_reclaim(void *); #define fdesc_lock genfs_lock #define fdesc_unlock genfs_unlock #define fdesc_bmap genfs_badop #define fdesc_strategy genfs_badop int fdesc_print(void *); int fdesc_pathconf(void *); #define fdesc_islocked genfs_islocked #define fdesc_advlock genfs_einval #define fdesc_bwrite genfs_eopnotsupp #define fdesc_revoke genfs_revoke #define fdesc_putpages genfs_null_putpages static int fdesc_attr(int, struct vattr *, kauth_cred_t); int (**fdesc_vnodeop_p)(void *); const struct vnodeopv_entry_desc fdesc_vnodeop_entries[] = { { &vop_default_desc, vn_default_error }, { &vop_lookup_desc, fdesc_lookup }, /* lookup */ { &vop_create_desc, fdesc_create }, /* create */ { &vop_mknod_desc, fdesc_mknod }, /* mknod */ { &vop_open_desc, fdesc_open }, /* open */ { &vop_close_desc, fdesc_close }, /* close */ { &vop_access_desc, fdesc_access }, /* access */ { &vop_getattr_desc, fdesc_getattr }, /* getattr */ { &vop_setattr_desc, fdesc_setattr }, /* setattr */ { &vop_read_desc, fdesc_read }, /* read */ { &vop_write_desc, fdesc_write }, /* write */ { &vop_fallocate_desc, genfs_eopnotsupp }, /* fallocate */ { &vop_fdiscard_desc, genfs_eopnotsupp }, /* fdiscard */ { &vop_ioctl_desc, fdesc_ioctl }, /* ioctl */ { &vop_fcntl_desc, fdesc_fcntl }, /* fcntl */ { &vop_poll_desc, fdesc_poll }, /* poll */ { &vop_kqfilter_desc, fdesc_kqfilter }, /* kqfilter */ { &vop_revoke_desc, fdesc_revoke }, /* revoke */ { &vop_mmap_desc, fdesc_mmap }, /* mmap */ { &vop_fsync_desc, fdesc_fsync }, /* fsync */ { &vop_seek_desc, fdesc_seek }, /* seek */ { &vop_remove_desc, fdesc_remove }, /* remove */ { &vop_link_desc, fdesc_link }, /* link */ { &vop_rename_desc, fdesc_rename }, /* rename */ { &vop_mkdir_desc, fdesc_mkdir }, /* mkdir */ { &vop_rmdir_desc, fdesc_rmdir }, /* rmdir */ { &vop_symlink_desc, fdesc_symlink }, /* symlink */ { &vop_readdir_desc, fdesc_readdir }, /* readdir */ { &vop_readlink_desc, fdesc_readlink }, /* readlink */ { &vop_abortop_desc, fdesc_abortop }, /* abortop */ { &vop_inactive_desc, fdesc_inactive }, /* inactive */ { &vop_reclaim_desc, fdesc_reclaim }, /* reclaim */ { &vop_lock_desc, fdesc_lock }, /* lock */ { &vop_unlock_desc, fdesc_unlock }, /* unlock */ { &vop_bmap_desc, fdesc_bmap }, /* bmap */ { &vop_strategy_desc, fdesc_strategy }, /* strategy */ { &vop_print_desc, fdesc_print }, /* print */ { &vop_islocked_desc, fdesc_islocked }, /* islocked */ { &vop_pathconf_desc, fdesc_pathconf }, /* pathconf */ { &vop_advlock_desc, fdesc_advlock }, /* advlock */ { &vop_bwrite_desc, fdesc_bwrite }, /* bwrite */ { &vop_putpages_desc, fdesc_putpages }, /* putpages */ { NULL, NULL } }; const struct vnodeopv_desc fdesc_vnodeop_opv_desc = { &fdesc_vnodeop_p, fdesc_vnodeop_entries }; /* * Initialise cache headers */ void fdesc_init(void) { int cttymajor; /* locate the major number */ cttymajor = devsw_name2chr("ctty", NULL, 0); devctty = makedev(cttymajor, 0); } void fdesc_done(void) { } /* * vp is the current namei directory * ndp is the name to locate in that directory... */ int fdesc_lookup(void *v) { struct vop_lookup_v2_args /* { struct vnode * a_dvp; struct vnode ** a_vpp; struct componentname * a_cnp; } */ *ap = v; struct vnode **vpp = ap->a_vpp; struct vnode *dvp = ap->a_dvp; struct componentname *cnp = ap->a_cnp; struct lwp *l = curlwp; const char *pname = cnp->cn_nameptr; struct proc *p = l->l_proc; unsigned fd = 0; int error, ix = -1; fdtab_t *dt; dt = curlwp->l_fd->fd_dt; if (cnp->cn_namelen == 1 && *pname == '.') { *vpp = dvp; vref(dvp); return (0); } switch (VTOFDESC(dvp)->fd_type) { default: case Flink: case Fdesc: case Fctty: error = ENOTDIR; goto bad; case Froot: if (cnp->cn_namelen == 2 && memcmp(pname, "fd", 2) == 0) { ix = FD_DEVFD; goto good; } if (cnp->cn_namelen == 3 && memcmp(pname, "tty", 3) == 0) { struct vnode *ttyvp = cttyvp(p); if (ttyvp == NULL) { error = ENXIO; goto bad; } ix = FD_CTTY; goto good; } switch (cnp->cn_namelen) { case 5: if (memcmp(pname, "stdin", 5) == 0) { ix = FD_STDIN; goto good; } break; case 6: if (memcmp(pname, "stdout", 6) == 0) { ix = FD_STDOUT; goto good; } else if (memcmp(pname, "stderr", 6) == 0) { ix = FD_STDERR; goto good; } break; } error = ENOENT; goto bad; case Fdevfd: if (cnp->cn_namelen == 2 && memcmp(pname, "..", 2) == 0) { ix = FD_ROOT; goto good; } fd = 0; while (*pname >= '0' && *pname <= '9') { fd = 10 * fd + *pname++ - '0'; if (fd >= dt->dt_nfiles) break; } if (*pname != '\0') { error = ENOENT; goto bad; } if (fd >= dt->dt_nfiles || dt->dt_ff[fd] == NULL || dt->dt_ff[fd]->ff_file == NULL) { error = EBADF; goto bad; } ix = FD_DESC + fd; goto good; } bad: *vpp = NULL; return error; good: KASSERT(ix != -1); error = vcache_get(dvp->v_mount, &ix, sizeof(ix), vpp); if (error) return error; /* * Prevent returning VNON nodes. * Operation fdesc_inactive() will reset the type to VNON. */ if (ix == FD_CTTY) (*vpp)->v_type = VCHR; else if (ix >= FD_DESC) (*vpp)->v_type = VREG; KASSERT((*vpp)->v_type != VNON); return 0; } int fdesc_open(void *v) { struct vop_open_args /* { struct vnode *a_vp; int a_mode; kauth_cred_t a_cred; } */ *ap = v; struct vnode *vp = ap->a_vp; switch (VTOFDESC(vp)->fd_type) { case Fdesc: /* * XXX Kludge: set 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 * VOP_OPEN will simply report the error. */ curlwp->l_dupfd = VTOFDESC(vp)->fd_fd; /* XXX */ return EDUPFD; case Fctty: return cdev_open(devctty, ap->a_mode, 0, curlwp); case Froot: case Fdevfd: case Flink: break; } return (0); } static int fdesc_attr(int fd, struct vattr *vap, kauth_cred_t cred) { file_t *fp; struct stat stb; int error; if ((fp = fd_getfile(fd)) == NULL) return (EBADF); switch (fp->f_type) { case DTYPE_VNODE: vn_lock(fp->f_vnode, LK_SHARED | LK_RETRY); error = VOP_GETATTR(fp->f_vnode, vap, cred); VOP_UNLOCK(fp->f_vnode); if (error == 0 && vap->va_type == VDIR) { /* * directories can cause loops in the namespace, * so turn off the 'x' bits to avoid trouble. */ vap->va_mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH); } break; default: memset(&stb, 0, sizeof(stb)); error = (*fp->f_ops->fo_stat)(fp, &stb); if (error) break; vattr_null(vap); switch(fp->f_type) { case DTYPE_SOCKET: vap->va_type = VSOCK; break; case DTYPE_PIPE: vap->va_type = VFIFO; break; default: /* use VNON perhaps? */ vap->va_type = VBAD; break; } vap->va_mode = stb.st_mode; vap->va_nlink = stb.st_nlink; vap->va_uid = stb.st_uid; vap->va_gid = stb.st_gid; vap->va_fsid = stb.st_dev; vap->va_fileid = stb.st_ino; vap->va_size = stb.st_size; vap->va_blocksize = stb.st_blksize; vap->va_atime = stb.st_atimespec; vap->va_mtime = stb.st_mtimespec; vap->va_ctime = stb.st_ctimespec; vap->va_gen = stb.st_gen; vap->va_flags = stb.st_flags; vap->va_rdev = stb.st_rdev; vap->va_bytes = stb.st_blocks * stb.st_blksize; break; } fd_putfile(fd); return (error); } int fdesc_getattr(void *v) { struct vop_getattr_args /* { struct vnode *a_vp; struct vattr *a_vap; kauth_cred_t a_cred; struct lwp *a_l; } */ *ap = v; struct vnode *vp = ap->a_vp; struct vattr *vap = ap->a_vap; unsigned fd; int error = 0; switch (VTOFDESC(vp)->fd_type) { case Froot: case Fdevfd: case Flink: case Fctty: vattr_null(vap); vap->va_fileid = VTOFDESC(vp)->fd_ix; #define R_ALL (S_IRUSR|S_IRGRP|S_IROTH) #define W_ALL (S_IWUSR|S_IWGRP|S_IWOTH) #define X_ALL (S_IXUSR|S_IXGRP|S_IXOTH) switch (VTOFDESC(vp)->fd_type) { case Flink: vap->va_mode = R_ALL|X_ALL; vap->va_type = VLNK; vap->va_rdev = 0; vap->va_nlink = 1; vap->va_size = strlen(VTOFDESC(vp)->fd_link); break; case Fctty: vap->va_mode = R_ALL|W_ALL; vap->va_type = VCHR; vap->va_rdev = devctty; vap->va_nlink = 1; vap->va_size = 0; break; default: vap->va_mode = R_ALL|X_ALL; vap->va_type = VDIR; vap->va_rdev = 0; vap->va_nlink = 2; vap->va_size = DEV_BSIZE; break; } vap->va_uid = 0; vap->va_gid = 0; vap->va_fsid = vp->v_mount->mnt_stat.f_fsidx.__fsid_val[0]; vap->va_blocksize = DEV_BSIZE; vap->va_atime.tv_sec = boottime.tv_sec; vap->va_atime.tv_nsec = 0; vap->va_mtime = vap->va_atime; vap->va_ctime = vap->va_mtime; vap->va_gen = 0; vap->va_flags = 0; vap->va_bytes = 0; break; case Fdesc: fd = VTOFDESC(vp)->fd_fd; error = fdesc_attr(fd, vap, ap->a_cred); break; default: panic("fdesc_getattr"); break; } if (error == 0) vp->v_type = vap->va_type; return (error); } int fdesc_setattr(void *v) { struct vop_setattr_args /* { struct vnode *a_vp; struct vattr *a_vap; kauth_cred_t a_cred; } */ *ap = v; file_t *fp; unsigned fd; /* * Can't mess with the root vnode */ switch (VTOFDESC(ap->a_vp)->fd_type) { case Fdesc: break; case Fctty: return (0); default: return (EACCES); } fd = VTOFDESC(ap->a_vp)->fd_fd; if ((fp = fd_getfile(fd)) == NULL) return (EBADF); /* * XXX: Can't reasonably set the attr's on any types currently. * On vnode's this will cause truncation and socket/pipes make * no sense. */ fd_putfile(fd); return (0); } struct fdesc_target { ino_t ft_fileno; u_char ft_type; u_char ft_namlen; const char *ft_name; } fdesc_targets[] = { #define N(s) sizeof(s)-1, s { FD_DEVFD, DT_DIR, N("fd") }, { FD_STDIN, DT_LNK, N("stdin") }, { FD_STDOUT, DT_LNK, N("stdout") }, { FD_STDERR, DT_LNK, N("stderr") }, { FD_CTTY, DT_UNKNOWN, N("tty") }, #undef N #define UIO_MX _DIRENT_RECLEN((struct dirent *)NULL, sizeof("stderr") - 1) }; static int nfdesc_targets = sizeof(fdesc_targets) / sizeof(fdesc_targets[0]); int fdesc_readdir(void *v) { struct vop_readdir_args /* { struct vnode *a_vp; struct uio *a_uio; kauth_cred_t a_cred; int *a_eofflag; off_t **a_cookies; int *a_ncookies; } */ *ap = v; struct uio *uio = ap->a_uio; struct dirent d; off_t i; int j; int error; off_t *cookies = NULL; int ncookies; fdtab_t *dt; switch (VTOFDESC(ap->a_vp)->fd_type) { case Fctty: return 0; case Fdesc: return ENOTDIR; default: break; } dt = curlwp->l_fd->fd_dt; if (uio->uio_resid < UIO_MX) return EINVAL; if (uio->uio_offset < 0) return EINVAL; error = 0; i = uio->uio_offset; (void)memset(&d, 0, UIO_MX); d.d_reclen = UIO_MX; if (ap->a_ncookies) ncookies = uio->uio_resid / UIO_MX; else ncookies = 0; if (VTOFDESC(ap->a_vp)->fd_type == Froot) { struct fdesc_target *ft; if (i >= nfdesc_targets) return 0; if (ap->a_ncookies) { ncookies = uimin(ncookies, (nfdesc_targets - i)); cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); *ap->a_cookies = cookies; *ap->a_ncookies = ncookies; } for (ft = &fdesc_targets[i]; uio->uio_resid >= UIO_MX && i < nfdesc_targets; ft++, i++) { switch (ft->ft_fileno) { case FD_CTTY: if (cttyvp(curproc) == NULL) continue; break; case FD_STDIN: case FD_STDOUT: case FD_STDERR: if ((ft->ft_fileno - FD_STDIN) >= dt->dt_nfiles) continue; if (dt->dt_ff[ft->ft_fileno - FD_STDIN] == NULL || dt->dt_ff[ft->ft_fileno - FD_STDIN]->ff_file == NULL) continue; break; } d.d_fileno = ft->ft_fileno; d.d_namlen = ft->ft_namlen; (void)memcpy(d.d_name, ft->ft_name, ft->ft_namlen + 1); d.d_type = ft->ft_type; if ((error = uiomove(&d, UIO_MX, uio)) != 0) break; if (cookies) *cookies++ = i + 1; } } else { membar_consumer(); if (ap->a_ncookies) { ncookies = uimin(ncookies, dt->dt_nfiles + 2); cookies = malloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK); *ap->a_cookies = cookies; *ap->a_ncookies = ncookies; } for (; i - 2 < dt->dt_nfiles && uio->uio_resid >= UIO_MX; i++) { switch (i) { case 0: case 1: d.d_fileno = FD_ROOT; /* XXX */ d.d_namlen = i + 1; (void)memcpy(d.d_name, "..", d.d_namlen); d.d_name[i + 1] = '\0'; d.d_type = DT_DIR; break; default: j = (int)i - 2; if (dt->dt_ff[j] == NULL || dt->dt_ff[j]->ff_file == NULL) continue; d.d_fileno = j + FD_STDIN; d.d_namlen = snprintf(d.d_name, sizeof(d.d_name), "%d", j); d.d_type = DT_UNKNOWN; break; } if ((error = uiomove(&d, UIO_MX, uio)) != 0) break; if (cookies) *cookies++ = i + 1; } } if (ap->a_ncookies && error) { free(*ap->a_cookies, M_TEMP); *ap->a_ncookies = 0; *ap->a_cookies = NULL; } uio->uio_offset = i; return error; } int fdesc_readlink(void *v) { struct vop_readlink_args /* { struct vnode *a_vp; struct uio *a_uio; kauth_cred_t a_cred; } */ *ap = v; struct vnode *vp = ap->a_vp; int error; if (vp->v_type != VLNK) return (EPERM); if (VTOFDESC(vp)->fd_type == Flink) { const char *ln = VTOFDESC(vp)->fd_link; error = uiomove(__UNCONST(ln), strlen(ln), ap->a_uio); } else { error = EOPNOTSUPP; } return (error); } int fdesc_read(void *v) { struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; kauth_cred_t a_cred; } */ *ap = v; int error = EOPNOTSUPP; struct vnode *vp = ap->a_vp; switch (VTOFDESC(vp)->fd_type) { case Fctty: VOP_UNLOCK(vp); error = cdev_read(devctty, ap->a_uio, ap->a_ioflag); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); break; default: error = EOPNOTSUPP; break; } return (error); } int fdesc_write(void *v) { struct vop_write_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; kauth_cred_t a_cred; } */ *ap = v; int error = EOPNOTSUPP; struct vnode *vp = ap->a_vp; switch (VTOFDESC(vp)->fd_type) { case Fctty: VOP_UNLOCK(vp); error = cdev_write(devctty, ap->a_uio, ap->a_ioflag); vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); break; default: error = EOPNOTSUPP; break; } return (error); } int fdesc_ioctl(void *v) { struct vop_ioctl_args /* { struct vnode *a_vp; u_long a_command; void *a_data; int a_fflag; kauth_cred_t a_cred; } */ *ap = v; int error = EOPNOTSUPP; switch (VTOFDESC(ap->a_vp)->fd_type) { case Fctty: error = cdev_ioctl(devctty, ap->a_command, ap->a_data, ap->a_fflag, curlwp); break; default: error = EOPNOTSUPP; break; } return (error); } int fdesc_poll(void *v) { struct vop_poll_args /* { struct vnode *a_vp; int a_events; } */ *ap = v; int revents; switch (VTOFDESC(ap->a_vp)->fd_type) { case Fctty: revents = cdev_poll(devctty, ap->a_events, curlwp); break; default: revents = genfs_poll(v); break; } return (revents); } int fdesc_kqfilter(void *v) { struct vop_kqfilter_args /* { struct vnode *a_vp; struct knote *a_kn; } */ *ap = v; int error, fd; file_t *fp; switch (VTOFDESC(ap->a_vp)->fd_type) { case Fctty: error = cdev_kqfilter(devctty, ap->a_kn); break; case Fdesc: /* just invoke kqfilter for the underlying descriptor */ fd = VTOFDESC(ap->a_vp)->fd_fd; if ((fp = fd_getfile(fd)) == NULL) return (1); error = (*fp->f_ops->fo_kqfilter)(fp, ap->a_kn); fd_putfile(fd); break; default: return (genfs_kqfilter(v)); } return (error); } int fdesc_inactive(void *v) { struct vop_inactive_v2_args /* { struct vnode *a_vp; } */ *ap = v; struct vnode *vp = ap->a_vp; struct fdescnode *fd = VTOFDESC(vp); /* * Clear out the v_type field to avoid * nasty things happening on reclaim. */ if (fd->fd_type == Fctty || fd->fd_type == Fdesc) vp->v_type = VNON; return (0); } int fdesc_reclaim(void *v) { struct vop_reclaim_v2_args /* { struct vnode *a_vp; } */ *ap = v; struct vnode *vp = ap->a_vp; struct fdescnode *fd = VTOFDESC(vp); VOP_UNLOCK(vp); vp->v_data = NULL; kmem_free(fd, sizeof(struct fdescnode)); return (0); } /* * Return POSIX pathconf information applicable to special devices. */ int fdesc_pathconf(void *v) { struct vop_pathconf_args /* { struct vnode *a_vp; int a_name; register_t *a_retval; } */ *ap = v; 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); case _PC_SYNC_IO: *ap->a_retval = 1; return (0); default: return (EINVAL); } /* NOTREACHED */ } /* * Print out the contents of a /dev/fd vnode. */ /* ARGSUSED */ int fdesc_print(void *v) { printf("tag VT_NON, fdesc vnode\n"); return (0); } int fdesc_link(void *v) { struct vop_link_v2_args /* { struct vnode *a_dvp; struct vnode *a_vp; struct componentname *a_cnp; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); return (EROFS); } int fdesc_symlink(void *v) { struct vop_symlink_v3_args /* { struct vnode *a_dvp; struct vnode **a_vpp; struct componentname *a_cnp; struct vattr *a_vap; char *a_target; } */ *ap = v; VOP_ABORTOP(ap->a_dvp, ap->a_cnp); return (EROFS); }