/* $OpenBSD: dead_vnops.c,v 1.16 2007/03/21 17:29:32 thib Exp $ */ /* $NetBSD: dead_vnops.c,v 1.16 1996/02/13 13:12:48 mycroft Exp $ */ /* * 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 8.2 (Berkeley) 11/21/94 */ #include #include #include #include #include #include #include #include #include /* * Prototypes for dead operations on vnodes. */ int dead_badop(void *); int dead_ebadf(void *); int dead_lookup(void *); #define dead_create dead_badop #define dead_mknod dead_badop int dead_open(void *); #define dead_close nullop #define dead_access dead_ebadf #define dead_getattr dead_ebadf #define dead_setattr dead_ebadf int dead_read(void *); int dead_write(void *); int dead_ioctl(void *); int dead_poll(void *); #define dead_fsync nullop #define dead_remove dead_badop #define dead_link dead_badop #define dead_rename dead_badop #define dead_mkdir dead_badop #define dead_rmdir dead_badop #define dead_symlink dead_badop #define dead_readdir dead_ebadf #define dead_readlink dead_ebadf #define dead_abortop dead_badop #define dead_inactive nullop #define dead_reclaim nullop int dead_lock(void *); #define dead_unlock vop_generic_unlock int dead_bmap(void *); int dead_strategy(void *); int dead_print(void *); #define dead_islocked vop_generic_islocked #define dead_pathconf dead_ebadf #define dead_advlock dead_ebadf #define dead_bwrite nullop int chkvnlock(struct vnode *); int (**dead_vnodeop_p)(void *); struct vnodeopv_entry_desc dead_vnodeop_entries[] = { { &vop_default_desc, vn_default_error }, { &vop_lookup_desc, dead_lookup }, /* lookup */ { &vop_create_desc, dead_create }, /* create */ { &vop_mknod_desc, dead_mknod }, /* mknod */ { &vop_open_desc, dead_open }, /* open */ { &vop_close_desc, dead_close }, /* close */ { &vop_access_desc, dead_access }, /* access */ { &vop_getattr_desc, dead_getattr }, /* getattr */ { &vop_setattr_desc, dead_setattr }, /* setattr */ { &vop_read_desc, dead_read }, /* read */ { &vop_write_desc, dead_write }, /* write */ { &vop_ioctl_desc, dead_ioctl }, /* ioctl */ { &vop_poll_desc, dead_poll }, /* poll */ { &vop_fsync_desc, dead_fsync }, /* fsync */ { &vop_remove_desc, dead_remove }, /* remove */ { &vop_link_desc, dead_link }, /* link */ { &vop_rename_desc, dead_rename }, /* rename */ { &vop_mkdir_desc, dead_mkdir }, /* mkdir */ { &vop_rmdir_desc, dead_rmdir }, /* rmdir */ { &vop_symlink_desc, dead_symlink }, /* symlink */ { &vop_readdir_desc, dead_readdir }, /* readdir */ { &vop_readlink_desc, dead_readlink }, /* readlink */ { &vop_abortop_desc, dead_abortop }, /* abortop */ { &vop_inactive_desc, dead_inactive }, /* inactive */ { &vop_reclaim_desc, dead_reclaim }, /* reclaim */ { &vop_lock_desc, dead_lock }, /* lock */ { &vop_unlock_desc, dead_unlock }, /* unlock */ { &vop_bmap_desc, dead_bmap }, /* bmap */ { &vop_strategy_desc, dead_strategy }, /* strategy */ { &vop_print_desc, dead_print }, /* print */ { &vop_islocked_desc, dead_islocked }, /* islocked */ { &vop_pathconf_desc, dead_pathconf }, /* pathconf */ { &vop_advlock_desc, dead_advlock }, /* advlock */ { &vop_bwrite_desc, dead_bwrite }, /* bwrite */ { (struct vnodeop_desc*)NULL, (int(*)(void *))NULL } }; struct vnodeopv_desc dead_vnodeop_opv_desc = { &dead_vnodeop_p, dead_vnodeop_entries }; /* * Trivial lookup routine that always fails. */ /* ARGSUSED */ int dead_lookup(v) void *v; { struct vop_lookup_args /* { struct vnode * a_dvp; struct vnode ** a_vpp; struct componentname * a_cnp; } */ *ap = v; *ap->a_vpp = NULL; return (ENOTDIR); } /* * Open always fails as if device did not exist. */ /* ARGSUSED */ int dead_open(v) void *v; { return (ENXIO); } /* * Vnode op for read */ /* ARGSUSED */ int dead_read(v) void *v; { struct vop_read_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap = v; if (chkvnlock(ap->a_vp)) panic("dead_read: lock"); /* * Return EOF for tty devices, EIO for others */ if ((ap->a_vp->v_flag & VISTTY) == 0) return (EIO); return (0); } /* * Vnode op for write */ /* ARGSUSED */ int dead_write(v) void *v; { struct vop_write_args /* { struct vnode *a_vp; struct uio *a_uio; int a_ioflag; struct ucred *a_cred; } */ *ap = v; if (chkvnlock(ap->a_vp)) panic("dead_write: lock"); return (EIO); } /* * Device ioctl operation. */ /* ARGSUSED */ int dead_ioctl(v) void *v; { 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 = v; if (!chkvnlock(ap->a_vp)) return (EBADF); return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap)); } /* ARGSUSED */ int dead_poll(v) void *v; { #if 0 struct vop_poll_args /* { struct vnode *a_vp; int a_events; struct proc *a_p; } */ *ap = v; #endif /* * Let the user find out that the descriptor is gone. */ return (POLLHUP); } /* * Just call the device strategy routine */ int dead_strategy(v) void *v; { struct vop_strategy_args /* { struct buf *a_bp; } */ *ap = v; int s; if (ap->a_bp->b_vp == NULL || !chkvnlock(ap->a_bp->b_vp)) { ap->a_bp->b_flags |= B_ERROR; s = splbio(); biodone(ap->a_bp); splx(s); return (EIO); } return (VOP_STRATEGY(ap->a_bp)); } /* * Wait until the vnode has finished changing state. */ int dead_lock(v) void *v; { struct vop_lock_args /* { struct vnode *a_vp; int a_flags; struct proc *a_p; } */ *ap = v; struct vnode *vp = ap->a_vp; if (ap->a_flags & LK_DRAIN || !chkvnlock(vp)) return (0); return (VCALL(vp, VOFFSET(vop_lock), ap)); } /* * Wait until the vnode has finished changing state. */ int dead_bmap(v) void *v; { struct vop_bmap_args /* { struct vnode *a_vp; daddr_t a_bn; struct vnode **a_vpp; daddr_t *a_bnp; int *a_runp; } */ *ap = v; if (!chkvnlock(ap->a_vp)) return (EIO); return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp)); } /* * Print out the contents of a dead vnode. */ /* ARGSUSED */ int dead_print(v) void *v; { printf("tag VT_NON, dead vnode\n"); return 0; } /* * Empty vnode failed operation */ /*ARGSUSED*/ int dead_ebadf(v) void *v; { return (EBADF); } /* * Empty vnode bad operation */ /*ARGSUSED*/ int dead_badop(v) void *v; { panic("dead_badop called"); /* NOTREACHED */ } /* * We have to wait during times when the vnode is * in a state of change. */ int chkvnlock(vp) register struct vnode *vp; { int locked = 0; while (vp->v_flag & VXLOCK) { vp->v_flag |= VXWANT; tsleep(vp, PINOD, "chkvnlock", 0); locked = 1; } return (locked); }