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/*- * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * 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. * 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. * * @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93 * $FreeBSD: release/9.1.0/sys/fs/deadfs/dead_vnops.c 206093 2010-04-02 14:03:01Z kib $ */ #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/mutex.h> #include <sys/poll.h> #include <sys/vnode.h> /* * Prototypes for dead operations on vnodes. */ static vop_bmap_t dead_bmap; static vop_ioctl_t dead_ioctl; static vop_lookup_t dead_lookup; static vop_open_t dead_open; static vop_poll_t dead_poll; static vop_read_t dead_read; static vop_write_t dead_write; static vop_getwritemount_t dead_getwritemount; static vop_rename_t dead_rename; struct vop_vector dead_vnodeops = { .vop_default = &default_vnodeops, .vop_access = VOP_EBADF, .vop_advlock = VOP_EBADF, .vop_bmap = dead_bmap, .vop_create = VOP_PANIC, .vop_getattr = VOP_EBADF, .vop_getwritemount = dead_getwritemount, .vop_inactive = VOP_NULL, .vop_ioctl = dead_ioctl, .vop_link = VOP_PANIC, .vop_lookup = dead_lookup, .vop_mkdir = VOP_PANIC, .vop_mknod = VOP_PANIC, .vop_open = dead_open, .vop_pathconf = VOP_EBADF, /* per pathconf(2) */ .vop_poll = dead_poll, .vop_read = dead_read, .vop_readdir = VOP_EBADF, .vop_readlink = VOP_EBADF, .vop_reclaim = VOP_NULL, .vop_remove = VOP_PANIC, .vop_rename = dead_rename, .vop_rmdir = VOP_PANIC, .vop_setattr = VOP_EBADF, .vop_symlink = VOP_PANIC, .vop_vptocnp = VOP_EBADF, .vop_write = dead_write, }; /* ARGSUSED */ static int dead_getwritemount(ap) struct vop_getwritemount_args /* { struct vnode *a_vp; struct mount **a_mpp; } */ *ap; { *(ap->a_mpp) = NULL; return (0); } /* * Trivial lookup routine that always fails. */ /* ARGSUSED */ static int dead_lookup(ap) struct vop_lookup_args /* { struct vnode * a_dvp; struct vnode ** a_vpp; struct componentname * a_cnp; } */ *ap; { *ap->a_vpp = NULL; return (ENOTDIR); } /* * Open always fails as if device did not exist. */ /* ARGSUSED */ static int dead_open(ap) struct vop_open_args /* { struct vnode *a_vp; int a_mode; struct ucred *a_cred; struct proc *a_p; } */ *ap; { return (ENXIO); } /* * Vnode op for read */ /* ARGSUSED */ static int dead_read(ap) struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap; { /* * Return EOF for tty devices, EIO for others */ if ((ap->a_vp->v_vflag & VV_ISTTY) == 0) return (EIO); return (0); } /* * Vnode op for write */ /* ARGSUSED */ static int dead_write(ap) struct vop_write_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap; { return (EIO); } /* * Device ioctl operation. */ /* ARGSUSED */ static int dead_ioctl(ap) struct vop_ioctl_args /* { struct vnode *a_vp; u_long a_command; caddr_t a_data; int a_fflag; struct ucred *a_cred; struct proc *a_p; } */ *ap; { /* XXX: Doesn't this just recurse back here ? */ return (VOP_IOCTL_AP(ap)); } /* * Wait until the vnode has finished changing state. */ static int dead_bmap(ap) struct vop_bmap_args /* { struct vnode *a_vp; daddr_t a_bn; struct bufobj **a_bop; daddr_t *a_bnp; int *a_runp; int *a_runb; } */ *ap; { return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_bop, ap->a_bnp, ap->a_runp, ap->a_runb)); } /* * Trivial poll routine that always returns POLLHUP. * This is necessary so that a process which is polling a file * gets notified when that file is revoke()d. */ static int dead_poll(ap) struct vop_poll_args *ap; { return (POLLHUP); } static int dead_rename(ap) struct vop_rename_args /* { struct vnode *a_fdvp; struct vnode *a_fvp; struct componentname *a_fcnp; struct vnode *a_tdvp; struct vnode *a_tvp; struct componentname *a_tcnp; } */ *ap; { vop_rename_fail(ap); return (EXDEV); }