2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 $
35 * $DragonFly: src/sys/vfs/deadfs/dead_vnops.c,v 1.8 2004/03/31 23:13:43 cpressey Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
42 #include <sys/vnode.h>
46 static int chkvnlock (struct vnode *);
48 * Prototypes for dead operations on vnodes.
50 static int dead_badop (void);
51 static int dead_bmap (struct vop_bmap_args *);
52 static int dead_ioctl (struct vop_ioctl_args *);
53 static int dead_lock (struct vop_lock_args *);
54 static int dead_lookup (struct vop_lookup_args *);
55 static int dead_open (struct vop_open_args *);
56 static int dead_poll (struct vop_poll_args *);
57 static int dead_print (struct vop_print_args *);
58 static int dead_read (struct vop_read_args *);
59 static int dead_write (struct vop_write_args *);
61 vop_t **dead_vnodeop_p;
62 static struct vnodeopv_entry_desc dead_vnodeop_entries[] = {
63 { &vop_default_desc, (vop_t *) vop_defaultop },
64 { &vop_access_desc, (vop_t *) vop_ebadf },
65 { &vop_advlock_desc, (vop_t *) vop_ebadf },
66 { &vop_bmap_desc, (vop_t *) dead_bmap },
67 { &vop_create_desc, (vop_t *) dead_badop },
68 { &vop_getattr_desc, (vop_t *) vop_ebadf },
69 { &vop_inactive_desc, (vop_t *) vop_null },
70 { &vop_ioctl_desc, (vop_t *) dead_ioctl },
71 { &vop_link_desc, (vop_t *) dead_badop },
72 { &vop_lock_desc, (vop_t *) dead_lock },
73 { &vop_lookup_desc, (vop_t *) dead_lookup },
74 { &vop_mkdir_desc, (vop_t *) dead_badop },
75 { &vop_mknod_desc, (vop_t *) dead_badop },
76 { &vop_mmap_desc, (vop_t *) dead_badop },
77 { &vop_open_desc, (vop_t *) dead_open },
78 { &vop_pathconf_desc, (vop_t *) vop_ebadf }, /* per pathconf(2) */
79 { &vop_poll_desc, (vop_t *) dead_poll },
80 { &vop_print_desc, (vop_t *) dead_print },
81 { &vop_read_desc, (vop_t *) dead_read },
82 { &vop_readdir_desc, (vop_t *) vop_ebadf },
83 { &vop_readlink_desc, (vop_t *) vop_ebadf },
84 { &vop_reclaim_desc, (vop_t *) vop_null },
85 { &vop_remove_desc, (vop_t *) dead_badop },
86 { &vop_rename_desc, (vop_t *) dead_badop },
87 { &vop_rmdir_desc, (vop_t *) dead_badop },
88 { &vop_setattr_desc, (vop_t *) vop_ebadf },
89 { &vop_symlink_desc, (vop_t *) dead_badop },
90 { &vop_write_desc, (vop_t *) dead_write },
93 static struct vnodeopv_desc dead_vnodeop_opv_desc =
94 { &dead_vnodeop_p, dead_vnodeop_entries };
96 VNODEOP_SET(dead_vnodeop_opv_desc);
99 * Trivial lookup routine that always fails.
101 * dead_lookup(struct vnode *a_dvp, struct vnode **a_vpp,
102 * struct componentname *a_cnp)
106 dead_lookup(struct vop_lookup_args *ap)
113 * Open always fails as if device did not exist.
115 * dead_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
120 dead_open(struct vop_open_args *ap)
128 * dead_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
129 * struct ucred *a_cred)
133 dead_read(struct vop_read_args *ap)
135 if (chkvnlock(ap->a_vp))
136 panic("dead_read: lock");
138 * Return EOF for tty devices, EIO for others
140 if ((ap->a_vp->v_flag & VISTTY) == 0)
148 * dead_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
149 * struct ucred *a_cred)
153 dead_write(struct vop_write_args *ap)
155 if (chkvnlock(ap->a_vp))
156 panic("dead_write: lock");
161 * Device ioctl operation.
163 * dead_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, int a_fflag,
164 * struct ucred *a_cred, struct proc *a_p)
168 dead_ioctl(struct vop_ioctl_args *ap)
170 if (!chkvnlock(ap->a_vp))
172 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
176 * Wait until the vnode has finished changing state.
178 * dead_lock(struct vnode *a_vp, lwkt_tokref_t a_vlock, int a_flags,
182 dead_lock(struct vop_lock_args *ap)
184 struct vnode *vp = ap->a_vp;
187 * Since we are not using the lock manager, we must clear
188 * the interlock here.
190 if (ap->a_flags & LK_INTERLOCK) {
191 lwkt_reltoken(ap->a_vlock);
192 ap->a_flags &= ~LK_INTERLOCK;
196 return (VCALL(vp, VOFFSET(vop_lock), ap));
200 * Wait until the vnode has finished changing state.
202 * dead_bmap(struct vnode *a_vp, daddr_t a_bn, struct vnode **a_vpp,
203 * daddr_t *a_bnp, int *a_runp, int *a_runb)
206 dead_bmap(struct vop_bmap_args *ap)
208 if (!chkvnlock(ap->a_vp))
210 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp, ap->a_runb));
214 * Print out the contents of a dead vnode.
216 * dead_print(struct vnode *a_vp)
220 dead_print(struct vop_print_args *ap)
222 printf("tag VT_NON, dead vnode\n");
227 * Empty vnode bad operation
232 panic("dead_badop called");
237 * We have to wait during times when the vnode is
238 * in a state of change.
241 chkvnlock(struct vnode *vp)
245 while (vp->v_flag & VXLOCK) {
246 vp->v_flag |= VXWANT;
247 (void) tsleep((caddr_t)vp, 0, "ckvnlk", 0);
254 * Trivial poll routine that always returns POLLHUP.
255 * This is necessary so that a process which is polling a file
256 * gets notified when that file is revoke()d.
259 dead_poll(struct vop_poll_args *ap)