filecore_node.c revision 1.27 1 /* $NetBSD: filecore_node.c,v 1.27 2014/10/04 13:27:24 hannken 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 1.27 2014/10/04 13:27:24 hannken 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 struct pool filecore_node_pool;
91
92 extern int prtactive; /* 1 => print out reclaim of active vnodes */
93
94 static const struct genfs_ops filecore_genfsops = {
95 .gop_size = genfs_size,
96 };
97
98 /*
99 * Initialize hash links for inodes and dnodes.
100 */
101 void
102 filecore_init(void)
103 {
104
105 pool_init(&filecore_node_pool, sizeof(struct filecore_node), 0, 0, 0,
106 "filecrnopl", &pool_allocator_nointr, IPL_NONE);
107 }
108
109 /*
110 * Reinitialize inode hash table.
111 */
112 void
113 filecore_reinit(void)
114 {
115
116 }
117
118 /*
119 * Destroy node pool and hash table.
120 */
121 void
122 filecore_done(void)
123 {
124
125 pool_destroy(&filecore_node_pool);
126 }
127
128 /*
129 * Initialize this vnode / filecore node pair.
130 * Caller assures no other thread will try to load this node.
131 */
132 int
133 filecore_loadvnode(struct mount *mp, struct vnode *vp,
134 const void *key, size_t key_len, const void **new_key)
135 {
136 ino_t ino;
137 struct filecore_mnt *fcmp;
138 struct filecore_node *ip;
139 struct buf *bp;
140 int error;
141
142 KASSERT(key_len == sizeof(ino));
143 memcpy(&ino, key, key_len);
144 fcmp = VFSTOFILECORE(mp);
145
146 ip = pool_get(&filecore_node_pool, PR_WAITOK);
147 memset(ip, 0, sizeof(struct filecore_node));
148 ip->i_vnode = vp;
149 ip->i_dev = fcmp->fc_dev;
150 ip->i_number = ino;
151 ip->i_block = -1;
152 ip->i_parent = -2;
153
154 if (ino == FILECORE_ROOTINO) {
155 /* Here we need to construct a root directory inode */
156 memcpy(ip->i_dirent.name, "root", 4);
157 ip->i_dirent.load = 0;
158 ip->i_dirent.exec = 0;
159 ip->i_dirent.len = FILECORE_DIR_SIZE;
160 ip->i_dirent.addr = fcmp->drec.root;
161 ip->i_dirent.attr = FILECORE_ATTR_DIR | FILECORE_ATTR_READ;
162
163 } else {
164 /* Read in Data from Directory Entry */
165 if ((error = filecore_bread(fcmp, ino & FILECORE_INO_MASK,
166 FILECORE_DIR_SIZE, NOCRED, &bp)) != 0) {
167 pool_put(&filecore_node_pool, ip);
168 return error;
169 }
170
171 memcpy(&ip->i_dirent,
172 fcdirentry(bp->b_data, ino >> FILECORE_INO_INDEX),
173 sizeof(struct filecore_direntry));
174 #ifdef FILECORE_DEBUG_BR
175 printf("brelse(%p) vf5\n", bp);
176 #endif
177 brelse(bp, 0);
178 }
179
180 ip->i_mnt = fcmp;
181 ip->i_devvp = fcmp->fc_devvp;
182 ip->i_diroff = 0;
183 vref(ip->i_devvp);
184
185 /*
186 * Initialize the associated vnode
187 */
188
189 vp->v_tag = VT_FILECORE;
190 vp->v_op = filecore_vnodeop_p;
191 vp->v_data = ip;
192 if (ip->i_dirent.attr & FILECORE_ATTR_DIR)
193 vp->v_type = VDIR;
194 else
195 vp->v_type = VREG;
196 if (ino == FILECORE_ROOTINO)
197 vp->v_vflag |= VV_ROOT;
198 genfs_node_init(vp, &filecore_genfsops);
199
200 /*
201 * XXX need generation number?
202 */
203
204 uvm_vnp_setsize(vp, ip->i_size);
205 *new_key = &ip->i_number;
206 return 0;
207 }
208
209 /*
210 * Last reference to an inode, write the inode out and if necessary,
211 * truncate and deallocate the file.
212 */
213 int
214 filecore_inactive(void *v)
215 {
216 struct vop_inactive_args /* {
217 struct vnode *a_vp;
218 bool *a_recycle;
219 } */ *ap = v;
220 struct vnode *vp = ap->a_vp;
221 struct filecore_node *ip = VTOI(vp);
222 int error = 0;
223
224 /*
225 * If we are done with the inode, reclaim it
226 * so that it can be reused immediately.
227 */
228 ip->i_flag = 0;
229 *ap->a_recycle = (filecore_staleinode(ip) != 0);
230 VOP_UNLOCK(vp);
231 return error;
232 }
233
234 /*
235 * Reclaim an inode so that it can be used for other purposes.
236 */
237 int
238 filecore_reclaim(void *v)
239 {
240 struct vop_reclaim_args /* {
241 struct vnode *a_vp;
242 struct lwp *a_l;
243 } */ *ap = v;
244 struct vnode *vp = ap->a_vp;
245 struct filecore_node *ip = VTOI(vp);
246
247 if (prtactive && vp->v_usecount > 1)
248 vprint("filecore_reclaim: pushing active", vp);
249 /*
250 * Remove the inode from the vnode cache.
251 */
252 vcache_remove(vp->v_mount, &ip->i_number, sizeof(ip->i_number));
253
254 /*
255 * Purge old data structures associated with the inode.
256 */
257 if (ip->i_devvp) {
258 vrele(ip->i_devvp);
259 ip->i_devvp = 0;
260 }
261 genfs_node_destroy(vp);
262 pool_put(&filecore_node_pool, vp->v_data);
263 vp->v_data = NULL;
264 return (0);
265 }
266