Annotation of sys/kern/vfs_default.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: vfs_default.c,v 1.34 2007/06/01 23:47:56 deraadt Exp $ */
2:
3: /*
4: * Portions of this code are:
5: *
6: * Copyright (c) 1989, 1993
7: * The Regents of the University of California. All rights reserved.
8: * (c) UNIX System Laboratories, Inc.
9: * All or some portions of this file are derived from material licensed
10: * to the University of California by American Telephone and Telegraph
11: * Co. or Unix System Laboratories, Inc. and are reproduced herein with
12: * the permission of UNIX System Laboratories, Inc.
13: *
14: * Redistribution and use in source and binary forms, with or without
15: * modification, are permitted provided that the following conditions
16: * are met:
17: * 1. Redistributions of source code must retain the above copyright
18: * notice, this list of conditions and the following disclaimer.
19: * 2. Redistributions in binary form must reproduce the above copyright
20: * notice, this list of conditions and the following disclaimer in the
21: * documentation and/or other materials provided with the distribution.
22: * 3. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: */
38:
39: #include <sys/param.h>
40: #include <sys/systm.h>
41: #include <sys/proc.h>
42: #include <sys/mount.h>
43: #include <sys/vnode.h>
44: #include <sys/namei.h>
45: #include <sys/malloc.h>
46: #include <sys/pool.h>
47: #include <sys/event.h>
48: #include <miscfs/specfs/specdev.h>
49:
50: int filt_generic_readwrite(struct knote *, long);
51: void filt_generic_detach(struct knote *);
52:
53: /*
54: * Eliminate all activity associated with the requested vnode
55: * and with all vnodes aliased to the requested vnode.
56: */
57: int
58: vop_generic_revoke(void *v)
59: {
60: struct vop_revoke_args *ap = v;
61: struct vnode *vp, *vq;
62: struct proc *p = curproc;
63:
64: #ifdef DIAGNOSTIC
65: if ((ap->a_flags & REVOKEALL) == 0)
66: panic("vop_generic_revoke");
67: #endif
68:
69: vp = ap->a_vp;
70:
71: if (vp->v_flag & VALIASED) {
72: /*
73: * If a vgone (or vclean) is already in progress,
74: * wait until it is done and return.
75: */
76: if (vp->v_flag & VXLOCK) {
77: vp->v_flag |= VXWANT;
78: tsleep(vp, PINOD, "vop_generic_revokeall", 0);
79:
80: return(0);
81: }
82:
83: /*
84: * Ensure that vp will not be vgone'd while we
85: * are eliminating its aliases.
86: */
87: vp->v_flag |= VXLOCK;
88: while (vp->v_flag & VALIASED) {
89: for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
90: if (vq->v_rdev != vp->v_rdev ||
91: vq->v_type != vp->v_type || vp == vq)
92: continue;
93: vgone(vq);
94: break;
95: }
96: }
97:
98: /*
99: * Remove the lock so that vgone below will
100: * really eliminate the vnode after which time
101: * vgone will awaken any sleepers.
102: */
103: vp->v_flag &= ~VXLOCK;
104: }
105:
106: vgonel(vp, p);
107:
108: return (0);
109: }
110:
111: int
112: vop_generic_bwrite(void *v)
113: {
114: struct vop_bwrite_args *ap = v;
115:
116: return (bwrite(ap->a_bp));
117: }
118:
119: int
120: vop_generic_abortop(void *v)
121: {
122: struct vop_abortop_args *ap = v;
123:
124: if ((ap->a_cnp->cn_flags & (HASBUF | SAVESTART)) == HASBUF)
125: pool_put(&namei_pool, ap->a_cnp->cn_pnbuf);
126:
127: return (0);
128: }
129:
130: /*
131: * Stubs to use when there is no locking to be done on the underlying object.
132: * A minimal shared lock is necessary to ensure that the underlying object
133: * is not revoked while an operation is in progress. So, an active shared
134: * count should be maintained in an auxiliary vnode lock structure. However,
135: * that's not done now.
136: */
137: int
138: vop_generic_lock(void *v)
139: {
140: return (0);
141: }
142:
143: /*
144: * Decrement the active use count. (Not done currently)
145: */
146: int
147: vop_generic_unlock(void *v)
148: {
149: return (0);
150: }
151:
152: /*
153: * Return whether or not the node is in use. (Not done currently)
154: */
155: int
156: vop_generic_islocked(void *v)
157: {
158: return (0);
159: }
160:
161: struct filterops generic_filtops =
162: { 1, NULL, filt_generic_detach, filt_generic_readwrite };
163:
164: int
165: vop_generic_kqfilter(void *v)
166: {
167: struct vop_kqfilter_args *ap = v;
168: struct knote *kn = ap->a_kn;
169:
170: switch (kn->kn_filter) {
171: case EVFILT_READ:
172: case EVFILT_WRITE:
173: kn->kn_fop = &generic_filtops;
174: break;
175: default:
176: return (1);
177: }
178:
179: return (0);
180: }
181:
182: void
183: filt_generic_detach(struct knote *kn)
184: {
185: }
186:
187: int
188: filt_generic_readwrite(struct knote *kn, long hint)
189: {
190: /*
191: * filesystem is gone, so set the EOF flag and schedule
192: * the knote for deletion.
193: */
194: if (hint == NOTE_REVOKE) {
195: kn->kn_flags |= (EV_EOF | EV_ONESHOT);
196: return (1);
197: }
198:
199: kn->kn_data = 0;
200:
201: return (1);
202: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to vfs_default.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / kern