/* * 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. * 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. * * @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93 * $FreeBSD: src/sys/miscfs/deadfs/dead_vnops.c,v 1.26 1999/08/28 00:46:42 peter Exp $ * $DragonFly: src/sys/vfs/deadfs/dead_vnops.c,v 1.20 2007/08/13 17:31:56 dillon Exp $ */ #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/lock.h> #include <sys/vnode.h> #include <sys/fcntl.h> #include <sys/buf.h> /* * Prototypes for dead operations on vnodes. */ static int dead_badop (void); static int dead_bmap (struct vop_bmap_args *); static int dead_ioctl (struct vop_ioctl_args *); static int dead_lookup (struct vop_old_lookup_args *); static int dead_open (struct vop_open_args *); static int dead_close (struct vop_close_args *); static int dead_print (struct vop_print_args *); static int dead_read (struct vop_read_args *); static int dead_write (struct vop_write_args *); struct vop_ops dead_vnode_vops = { .vop_default = vop_defaultop, .vop_access = (void *)vop_ebadf, .vop_advlock = (void *)vop_ebadf, .vop_bmap = dead_bmap, .vop_old_create = (void *)dead_badop, .vop_getattr = (void *)vop_ebadf, .vop_inactive = (void *)vop_null, .vop_ioctl = dead_ioctl, .vop_old_link = (void *)dead_badop, .vop_old_lookup = dead_lookup, .vop_old_mkdir = (void *)dead_badop, .vop_old_mknod = (void *)dead_badop, .vop_open = dead_open, .vop_close = dead_close, .vop_pathconf = (void *)vop_ebadf, /* per pathconf(2) */ .vop_print = dead_print, .vop_read = dead_read, .vop_readdir = (void *)vop_ebadf, .vop_readlink = (void *)vop_ebadf, .vop_reclaim = (void *)vop_null, .vop_old_remove = (void *)dead_badop, .vop_old_rename = (void *)dead_badop, .vop_old_rmdir = (void *)dead_badop, .vop_setattr = (void *)vop_ebadf, .vop_old_symlink = (void *)dead_badop, .vop_write = dead_write }; struct vop_ops *dead_vnode_vops_p = &dead_vnode_vops; VNODEOP_SET(dead_vnode_vops); /* * Trivial lookup routine that always fails. * * dead_lookup(struct vnode *a_dvp, struct vnode **a_vpp, * struct componentname *a_cnp) */ /* ARGSUSED */ static int dead_lookup(struct vop_old_lookup_args *ap) { *ap->a_vpp = NULL; return (ENOTDIR); } /* * Open always fails as if device did not exist. * * dead_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, * struct proc *a_p) */ /* ARGSUSED */ static int dead_open(struct vop_open_args *ap) { return (ENXIO); } /* * Close always succeeds, and does not warn or panic if v_opencount or * v_writecount is incorrect, because a forced unmount or revocation * might have closed the file out from under the descriptor. */ static int dead_close(struct vop_close_args *ap) { struct vnode *vp = ap->a_vp; vn_lock(vp, LK_UPGRADE | LK_RETRY); /* safety */ if (vp->v_opencount > 0) { if ((ap->a_fflag & FWRITE) && vp->v_writecount > 0) atomic_add_int(&vp->v_writecount, -1); atomic_add_int(&vp->v_opencount, -1); } return (0); } /* * Vnode op for read * * dead_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, * struct ucred *a_cred) */ /* ARGSUSED */ static int dead_read(struct vop_read_args *ap) { /* * Return EOF for tty devices, EIO for others */ if ((ap->a_vp->v_flag & VISTTY) == 0) return (EIO); return (0); } /* * Vnode op for write * * dead_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, * struct ucred *a_cred) */ /* ARGSUSED */ static int dead_write(struct vop_write_args *ap) { return (EIO); } /* * Device ioctl operation. * * dead_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, int a_fflag, * struct ucred *a_cred, struct proc *a_p) */ /* ARGSUSED */ static int dead_ioctl(struct vop_ioctl_args *ap) { return (ENOTTY); } /* * Wait until the vnode has finished changing state. * * dead_bmap(struct vnode *a_vp, off_t a_loffset, * off_t *a_doffsetp, int *a_runp, int *a_runb) */ static int dead_bmap(struct vop_bmap_args *ap) { return (EIO); } /* * Print out the contents of a dead vnode. * * dead_print(struct vnode *a_vp) */ /* ARGSUSED */ static int dead_print(struct vop_print_args *ap) { kprintf("tag VT_NON, dead vnode\n"); return (0); } /* * Empty vnode bad operation */ static int dead_badop(void) { panic("dead_badop called"); /* NOTREACHED */ }
