filecore_node.c revision 1.19.4.4 1 /* $NetBSD: filecore_node.c,v 1.19.4.4 2011/05/31 03:04:58 rmind Exp $ */
2
3 /*-
4 * Copyright (c) 1982, 1986, 1989, 1994
5 * The Regents of the University of California.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * filecore_node.c 1.0 1998/6/4
33 */
34
35 /*-
36 * Copyright (c) 1998 Andrew McMurry
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. All advertising materials mentioning features or use of this software
47 * must display the following acknowledgement:
48 * This product includes software developed by the University of
49 * California, Berkeley and its contributors.
50 * 4. Neither the name of the University nor the names of its contributors
51 * may be used to endorse or promote products derived from this software
52 * without specific prior written permission.
53 *
54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
64 * SUCH DAMAGE.
65 *
66 * filecore_node.c 1.0 1998/6/4
67 */
68
69 #include <sys/cdefs.h>
70 __KERNEL_RCSID(0, "$NetBSD: filecore_node.c,v 1.19.4.4 2011/05/31 03:04:58 rmind Exp $");
71
72 #include <sys/param.h>
73 #include <sys/systm.h>
74 #include <sys/mount.h>
75 #include <sys/proc.h>
76 #include <sys/file.h>
77 #include <sys/buf.h>
78 #include <sys/vnode.h>
79 #include <sys/namei.h>
80 #include <sys/kernel.h>
81 #include <sys/pool.h>
82 #include <sys/stat.h>
83 #include <sys/mutex.h>
84
85 #include <fs/filecorefs/filecore.h>
86 #include <fs/filecorefs/filecore_extern.h>
87 #include <fs/filecorefs/filecore_node.h>
88 #include <fs/filecorefs/filecore_mount.h>
89
90 /*
91 * Structures associated with filecore_node caching.
92 */
93 static LIST_HEAD(ihashhead, filecore_node) *filecorehashtbl;
94 static u_long filecorehash;
95
96 #define INOHASH(device, inum) (((device) + ((inum)>>12)) & filecorehash)
97
98 static kmutex_t filecore_ihash_lock;
99 struct pool filecore_node_pool;
100
101 extern int prtactive; /* 1 => print out reclaim of active vnodes */
102
103 /*
104 * Initialize hash links for inodes and dnodes.
105 */
106 void
107 filecore_init(void)
108 {
109
110 mutex_init(&filecore_ihash_lock, MUTEX_DEFAULT, IPL_NONE);
111 pool_init(&filecore_node_pool, sizeof(struct filecore_node), 0, 0, 0,
112 "filecrnopl", &pool_allocator_nointr, IPL_NONE);
113 filecorehashtbl = hashinit(desiredvnodes, HASH_LIST, true,
114 &filecorehash);
115 }
116
117 /*
118 * Reinitialize inode hash table.
119 */
120 void
121 filecore_reinit(void)
122 {
123 struct filecore_node *ip;
124 struct ihashhead *oldhash, *hash;
125 u_long oldmask, mask, val;
126 int i;
127
128 hash = hashinit(desiredvnodes, HASH_LIST, true, &mask);
129
130 mutex_enter(&filecore_ihash_lock);
131 oldhash = filecorehashtbl;
132 oldmask = filecorehash;
133 filecorehashtbl = hash;
134 filecorehash = mask;
135 for (i = 0; i <= oldmask; i++) {
136 while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
137 LIST_REMOVE(ip, i_hash);
138 val = INOHASH(ip->i_dev, ip->i_number);
139 LIST_INSERT_HEAD(&hash[val], ip, i_hash);
140 }
141 }
142 mutex_exit(&filecore_ihash_lock);
143 hashdone(oldhash, HASH_LIST, oldmask);
144 }
145
146 /*
147 * Destroy node pool and hash table.
148 */
149 void
150 filecore_done(void)
151 {
152
153 hashdone(filecorehashtbl, HASH_LIST, filecorehash);
154 pool_destroy(&filecore_node_pool);
155 mutex_destroy(&filecore_ihash_lock);
156 }
157
158 /*
159 * Use the device/inum pair to find the incore inode, and return a pointer
160 * to it. If it is in core, but locked, wait for it.
161 */
162 struct vnode *
163 filecore_ihashget(dev_t dev, ino_t inum)
164 {
165 struct filecore_node *ip;
166 struct vnode *vp;
167
168 loop:
169 mutex_enter(&filecore_ihash_lock);
170 LIST_FOREACH(ip, &filecorehashtbl[INOHASH(dev, inum)], i_hash) {
171 if (inum == ip->i_number && dev == ip->i_dev) {
172 vp = ITOV(ip);
173 mutex_enter(vp->v_interlock);
174 mutex_exit(&filecore_ihash_lock);
175 if (vget(vp, LK_EXCLUSIVE))
176 goto loop;
177 return (vp);
178 }
179 }
180 mutex_exit(&filecore_ihash_lock);
181 return (NULL);
182 }
183
184 /*
185 * Insert the inode into the hash table, and return it locked.
186 */
187 void
188 filecore_ihashins(struct filecore_node *ip)
189 {
190 struct ihashhead *ipp;
191
192 mutex_enter(&filecore_ihash_lock);
193 ipp = &filecorehashtbl[INOHASH(ip->i_dev, ip->i_number)];
194 LIST_INSERT_HEAD(ipp, ip, i_hash);
195 mutex_exit(&filecore_ihash_lock);
196
197 VOP_LOCK(ITOV(ip), LK_EXCLUSIVE);
198 }
199
200 /*
201 * Remove the inode from the hash table.
202 */
203 void
204 filecore_ihashrem(struct filecore_node *ip)
205 {
206 mutex_enter(&filecore_ihash_lock);
207 LIST_REMOVE(ip, i_hash);
208 mutex_exit(&filecore_ihash_lock);
209 }
210
211 /*
212 * Last reference to an inode, write the inode out and if necessary,
213 * truncate and deallocate the file.
214 */
215 int
216 filecore_inactive(void *v)
217 {
218 struct vop_inactive_args /* {
219 struct vnode *a_vp;
220 bool *a_recycle;
221 } */ *ap = v;
222 struct vnode *vp = ap->a_vp;
223 struct filecore_node *ip = VTOI(vp);
224 int error = 0;
225
226 /*
227 * If we are done with the inode, reclaim it
228 * so that it can be reused immediately.
229 */
230 ip->i_flag = 0;
231 *ap->a_recycle = (filecore_staleinode(ip) != 0);
232 VOP_UNLOCK(vp);
233 return error;
234 }
235
236 /*
237 * Reclaim an inode so that it can be used for other purposes.
238 */
239 int
240 filecore_reclaim(void *v)
241 {
242 struct vop_reclaim_args /* {
243 struct vnode *a_vp;
244 struct lwp *a_l;
245 } */ *ap = v;
246 struct vnode *vp = ap->a_vp;
247 struct filecore_node *ip = VTOI(vp);
248
249 if (prtactive && vp->v_usecount > 1)
250 vprint("filecore_reclaim: pushing active", vp);
251 /*
252 * Remove the inode from its hash chain.
253 */
254 filecore_ihashrem(ip);
255 /*
256 * Purge old data structures associated with the inode.
257 */
258 if (ip->i_devvp) {
259 vrele(ip->i_devvp);
260 ip->i_devvp = 0;
261 }
262 genfs_node_destroy(vp);
263 pool_put(&filecore_node_pool, vp->v_data);
264 vp->v_data = NULL;
265 return (0);
266 }
267