filecore_node.c revision 1.8.4.4 1 /* $NetBSD: filecore_node.c,v 1.8.4.4 2007/09/16 19:04:28 ad 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 1.8.4.4 2007/09/16 19:04:28 ad 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/malloc.h>
82 #include <sys/pool.h>
83 #include <sys/stat.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 LIST_HEAD(ihashhead, filecore_node) *filecorehashtbl;
94 u_long filecorehash;
95 #define INOHASH(device, inum) (((device) + ((inum)>>12)) & filecorehash)
96 struct simplelock filecore_ihash_slock;
97
98 struct pool filecore_node_pool;
99
100 extern int prtactive; /* 1 => print out reclaim of active vnodes */
101
102 /*
103 * Initialize hash links for inodes and dnodes.
104 */
105 void
106 filecore_init()
107 {
108
109 malloc_type_attach(M_FILECOREMNT);
110 pool_init(&filecore_node_pool, sizeof(struct filecore_node), 0, 0, 0,
111 "filecrnopl", &pool_allocator_nointr, IPL_NONE);
112 filecorehashtbl = hashinit(desiredvnodes, HASH_LIST, M_FILECOREMNT,
113 M_WAITOK, &filecorehash);
114 simple_lock_init(&filecore_ihash_slock);
115 }
116
117 /*
118 * Reinitialize inode hash table.
119 */
120 void
121 filecore_reinit()
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, M_FILECOREMNT, M_WAITOK,
129 &mask);
130
131 simple_lock(&filecore_ihash_slock);
132 oldhash = filecorehashtbl;
133 oldmask = filecorehash;
134 filecorehashtbl = hash;
135 filecorehash = mask;
136 for (i = 0; i <= oldmask; i++) {
137 while ((ip = LIST_FIRST(&oldhash[i])) != NULL) {
138 LIST_REMOVE(ip, i_hash);
139 val = INOHASH(ip->i_dev, ip->i_number);
140 LIST_INSERT_HEAD(&hash[val], ip, i_hash);
141 }
142 }
143 simple_unlock(&filecore_ihash_slock);
144 hashdone(oldhash, M_FILECOREMNT);
145 }
146
147 /*
148 * Destroy node pool and hash table.
149 */
150 void
151 filecore_done()
152 {
153 hashdone(filecorehashtbl, M_FILECOREMNT);
154 pool_destroy(&filecore_node_pool);
155 malloc_type_detach(M_FILECOREMNT);
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, inum)
164 dev_t dev;
165 ino_t inum;
166 {
167 struct filecore_node *ip;
168 struct vnode *vp;
169
170 loop:
171 simple_lock(&filecore_ihash_slock);
172 LIST_FOREACH(ip, &filecorehashtbl[INOHASH(dev, inum)], i_hash) {
173 if (inum == ip->i_number && dev == ip->i_dev) {
174 vp = ITOV(ip);
175 mutex_enter(&vp->v_interlock);
176 simple_unlock(&filecore_ihash_slock);
177 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK))
178 goto loop;
179 return (vp);
180 }
181 }
182 simple_unlock(&filecore_ihash_slock);
183 return (NULL);
184 }
185
186 /*
187 * Insert the inode into the hash table, and return it locked.
188 */
189 void
190 filecore_ihashins(ip)
191 struct filecore_node *ip;
192 {
193 struct ihashhead *ipp;
194 struct vnode *vp;
195
196 simple_lock(&filecore_ihash_slock);
197 ipp = &filecorehashtbl[INOHASH(ip->i_dev, ip->i_number)];
198 LIST_INSERT_HEAD(ipp, ip, i_hash);
199 simple_unlock(&filecore_ihash_slock);
200
201 vp = ip->i_vnode;
202 lockmgr(&vp->v_lock, LK_EXCLUSIVE, &vp->v_interlock);
203 }
204
205 /*
206 * Remove the inode from the hash table.
207 */
208 void
209 filecore_ihashrem(ip)
210 struct filecore_node *ip;
211 {
212 simple_lock(&filecore_ihash_slock);
213 LIST_REMOVE(ip, i_hash);
214 simple_unlock(&filecore_ihash_slock);
215 }
216
217 /*
218 * Last reference to an inode, write the inode out and if necessary,
219 * truncate and deallocate the file.
220 */
221 int
222 filecore_inactive(v)
223 void *v;
224 {
225 struct vop_inactive_args /* {
226 struct lwp *a_l;
227 bool *recycle;
228 } */ *ap = v;
229 struct vnode *vp = ap->a_vp;
230 struct filecore_node *ip = VTOI(vp);
231 int error = 0;
232
233 if (prtactive && vp->v_usecount != 0)
234 vprint("filecore_inactive: pushing active", vp);
235
236 ip->i_flag = 0;
237 VOP_UNLOCK(vp, 0);
238 /*
239 * If we are done with the inode, reclaim it
240 * so that it can be reused immediately.
241 */
242 *ap->a_recycle = (filecore_staleinode(ip) != 0);
243 return error;
244 }
245
246 /*
247 * Reclaim an inode so that it can be used for other purposes.
248 */
249 int
250 filecore_reclaim(v)
251 void *v;
252 {
253 struct vop_reclaim_args /* {
254 struct vnode *a_vp;
255 struct lwp *a_l;
256 } */ *ap = v;
257 struct vnode *vp = ap->a_vp;
258 struct filecore_node *ip = VTOI(vp);
259
260 if (prtactive && vp->v_usecount != 0)
261 vprint("filecore_reclaim: pushing active", vp);
262 /*
263 * Remove the inode from its hash chain.
264 */
265 filecore_ihashrem(ip);
266 /*
267 * Purge old data structures associated with the inode.
268 */
269 cache_purge(vp);
270 if (ip->i_devvp) {
271 vrele(ip->i_devvp);
272 ip->i_devvp = 0;
273 }
274 genfs_node_destroy(vp);
275 pool_put(&filecore_node_pool, vp->v_data);
276 vp->v_data = NULL;
277 return (0);
278 }
279