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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 $
35 * $DragonFly: src/sys/vfs/deadfs/dead_vnops.c,v 1.6 2003/08/20 09:56:31 rob 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.
104 struct vop_lookup_args /* {
105 struct vnode * a_dvp;
106 struct vnode ** a_vpp;
107 struct componentname * a_cnp;
116 * Open always fails as if device did not exist.
121 struct vop_open_args /* {
124 struct ucred *a_cred;
138 struct vop_read_args /* {
142 struct ucred *a_cred;
146 if (chkvnlock(ap->a_vp))
147 panic("dead_read: lock");
149 * Return EOF for tty devices, EIO for others
151 if ((ap->a_vp->v_flag & VISTTY) == 0)
162 struct vop_write_args /* {
166 struct ucred *a_cred;
170 if (chkvnlock(ap->a_vp))
171 panic("dead_write: lock");
176 * Device ioctl operation.
181 struct vop_ioctl_args /* {
186 struct ucred *a_cred;
191 if (!chkvnlock(ap->a_vp))
193 return (VCALL(ap->a_vp, VOFFSET(vop_ioctl), ap));
198 * Wait until the vnode has finished changing state.
202 struct vop_lock_args /* {
208 struct vnode *vp = ap->a_vp;
211 * Since we are not using the lock manager, we must clear
212 * the interlock here.
214 if (ap->a_flags & LK_INTERLOCK) {
215 lwkt_reltoken(&vp->v_interlock);
216 ap->a_flags &= ~LK_INTERLOCK;
220 return (VCALL(vp, VOFFSET(vop_lock), ap));
224 * Wait until the vnode has finished changing state.
228 struct vop_bmap_args /* {
231 struct vnode **a_vpp;
238 if (!chkvnlock(ap->a_vp))
240 return (VOP_BMAP(ap->a_vp, ap->a_bn, ap->a_vpp, ap->a_bnp, ap->a_runp, ap->a_runb));
244 * Print out the contents of a dead vnode.
249 struct vop_print_args /* {
254 printf("tag VT_NON, dead vnode\n");
259 * Empty vnode bad operation
265 panic("dead_badop called");
270 * We have to wait during times when the vnode is
271 * in a state of change.
279 while (vp->v_flag & VXLOCK) {
280 vp->v_flag |= VXWANT;
281 (void) tsleep((caddr_t)vp, 0, "ckvnlk", 0);
288 * Trivial poll routine that always returns POLLHUP.
289 * This is necessary so that a process which is polling a file
290 * gets notified when that file is revoke()d.
294 struct vop_poll_args *ap;