2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
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14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
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33 * @(#)dead_vnops.c 8.1 (Berkeley) 6/10/93
34 * $FreeBSD: src/sys/miscfs/deadfs/dead_vnops.c,v 1.26 1999/08/28 00:46:42 peter Exp $
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
41 #include <sys/vnode.h>
45 static int chkvnlock __P((struct vnode *));
47 * Prototypes for dead operations on vnodes.
49 static int dead_badop __P((void));
50 static int dead_bmap __P((struct vop_bmap_args *));
51 static int dead_ioctl __P((struct vop_ioctl_args *));
52 static int dead_lock __P((struct vop_lock_args *));
53 static int dead_lookup __P((struct vop_lookup_args *));
54 static int dead_open __P((struct vop_open_args *));
55 static int dead_poll __P((struct vop_poll_args *));
56 static int dead_print __P((struct vop_print_args *));
57 static int dead_read __P((struct vop_read_args *));
58 static int dead_write __P((struct vop_write_args *));
60 vop_t **dead_vnodeop_p;
61 static struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
62 { &vop_default_desc, (vop_t *) vop_defaultop },
63 { &vop_access_desc, (vop_t *) vop_ebadf },
64 { &vop_advlock_desc, (vop_t *) vop_ebadf },
65 { &vop_bmap_desc, (vop_t *) dead_bmap },
66 { &vop_create_desc, (vop_t *) dead_badop },
67 { &vop_getattr_desc, (vop_t *) vop_ebadf },
68 { &vop_inactive_desc, (vop_t *) vop_null },
69 { &vop_ioctl_desc, (vop_t *) dead_ioctl },
70 { &vop_link_desc, (vop_t *) dead_badop },
71 { &vop_lock_desc, (vop_t *) dead_lock },
72 { &vop_lookup_desc, (vop_t *) dead_lookup },
73 { &vop_mkdir_desc, (vop_t *) dead_badop },
74 { &vop_mknod_desc, (vop_t *) dead_badop },
75 { &vop_mmap_desc, (vop_t *) dead_badop },
76 { &vop_open_desc, (vop_t *) dead_open },
77 { &vop_pathconf_desc, (vop_t *) vop_ebadf }, /* per pathconf(2) */
78 { &vop_poll_desc, (vop_t *) dead_poll },
79 { &vop_print_desc, (vop_t *) dead_print },
80 { &vop_read_desc, (vop_t *) dead_read },
81 { &vop_readdir_desc, (vop_t *) vop_ebadf },
82 { &vop_readlink_desc, (vop_t *) vop_ebadf },
83 { &vop_reclaim_desc, (vop_t *) vop_null },
84 { &vop_remove_desc, (vop_t *) dead_badop },
85 { &vop_rename_desc, (vop_t *) dead_badop },
86 { &vop_rmdir_desc, (vop_t *) dead_badop },
87 { &vop_setattr_desc, (vop_t *) vop_ebadf },
88 { &vop_symlink_desc, (vop_t *) dead_badop },
89 { &vop_write_desc, (vop_t *) dead_write },
92 static struct vnodeopv_desc dead_vnodeop_opv_desc =
93 { &dead_vnodeop_p, dead_vnodeop_entries };
95 VNODEOP_SET(dead_vnodeop_opv_desc);
98 * Trivial lookup routine that always fails.
103 struct vop_lookup_args /* {
104 struct vnode * a_dvp;
105 struct vnode ** a_vpp;
106 struct componentname * a_cnp;
115 * Open always fails as if device did not exist.
120 struct vop_open_args /* {
123 struct ucred *a_cred;
137 struct vop_read_args /* {
141 struct ucred *a_cred;
145 if (chkvnlock(ap->a_vp))
146 panic("dead_read: lock");
148 * Return EOF for tty devices, EIO for others
150 if ((ap->a_vp->v_flag & VISTTY) == 0)
161 struct vop_write_args /* {
165 struct ucred *a_cred;
169 if (chkvnlock(ap->a_vp))
170 panic("dead_write: lock");
175 * Device ioctl operation.
180 struct vop_ioctl_args /* {
185 struct ucred *a_cred;
190 if (!chkvnlock(ap->a_vp))
192 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
197 * Wait until the vnode has finished changing state.
201 struct vop_lock_args /* {
207 struct vnode *vp = ap->a_vp;
210 * Since we are not using the lock manager, we must clear
211 * the interlock here.
213 if (ap->a_flags & LK_INTERLOCK) {
214 simple_unlock(&vp->v_interlock);
215 ap->a_flags &= ~LK_INTERLOCK;
219 return (VCALL(vp, VOFFSET(vop_lock), ap));
223 * Wait until the vnode has finished changing state.
227 struct vop_bmap_args /* {
230 struct vnode **a_vpp;
237 if (!chkvnlock(ap->a_vp))
239 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp, ap->a_runb));
243 * Print out the contents of a dead vnode.
248 struct vop_print_args /* {
253 printf("tag VT_NON, dead vnode\n");
258 * Empty vnode bad operation
264 panic("dead_badop called");
269 * We have to wait during times when the vnode is
270 * in a state of change.
274 register struct vnode *vp;
278 while (vp->v_flag & VXLOCK) {
279 vp->v_flag |= VXWANT;
280 (void) tsleep((caddr_t)vp, PINOD, "ckvnlk", 0);
287 * Trivial poll routine that always returns POLLHUP.
288 * This is necessary so that a process which is polling a file
289 * gets notified when that file is revoke()d.
293 struct vop_poll_args *ap;