1 /* $NetBSD: filecore_node.c,v 1.31 2017/05/26 14:34:19 riastradh 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 1.31 2017/05/26 14:34:19 riastradh 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 static const struct genfs_ops filecore_genfsops = {
93 .gop_size = genfs_size,
94 };
95
96 /*
97 * Initialize hash links for inodes and dnodes.
98 */
99 void
filecore_init(void)100 filecore_init(void)
101 {
102
103 pool_init(&filecore_node_pool, sizeof(struct filecore_node), 0, 0, 0,
104 "filecrnopl", &pool_allocator_nointr, IPL_NONE);
105 }
106
107 /*
108 * Reinitialize inode hash table.
109 */
110 void
filecore_reinit(void)111 filecore_reinit(void)
112 {
113
114 }
115
116 /*
117 * Destroy node pool and hash table.
118 */
119 void
filecore_done(void)120 filecore_done(void)
121 {
122
123 pool_destroy(&filecore_node_pool);
124 }
125
126 /*
127 * Initialize this vnode / filecore node pair.
128 * Caller assures no other thread will try to load this node.
129 */
130 int
filecore_loadvnode(struct mount * mp,struct vnode * vp,const void * key,size_t key_len,const void ** new_key)131 filecore_loadvnode(struct mount *mp, struct vnode *vp,
132 const void *key, size_t key_len, const void **new_key)
133 {
134 ino_t ino;
135 struct filecore_mnt *fcmp;
136 struct filecore_node *ip;
137 struct buf *bp;
138 int error;
139
140 KASSERT(key_len == sizeof(ino));
141 memcpy(&ino, key, key_len);
142 fcmp = VFSTOFILECORE(mp);
143
144 ip = pool_get(&filecore_node_pool, PR_WAITOK);
145 memset(ip, 0, sizeof(struct filecore_node));
146 ip->i_vnode = vp;
147 ip->i_dev = fcmp->fc_dev;
148 ip->i_number = ino;
149 ip->i_block = -1;
150 ip->i_parent = -2;
151
152 if (ino == FILECORE_ROOTINO) {
153 /* Here we need to construct a root directory inode */
154 memcpy(ip->i_dirent.name, "root", 4);
155 ip->i_dirent.load = 0;
156 ip->i_dirent.exec = 0;
157 ip->i_dirent.len = FILECORE_DIR_SIZE;
158 ip->i_dirent.addr = fcmp->drec.root;
159 ip->i_dirent.attr = FILECORE_ATTR_DIR | FILECORE_ATTR_READ;
160
161 } else {
162 /* Read in Data from Directory Entry */
163 if ((error = filecore_bread(fcmp, ino & FILECORE_INO_MASK,
164 FILECORE_DIR_SIZE, NOCRED, &bp)) != 0) {
165 pool_put(&filecore_node_pool, ip);
166 return error;
167 }
168
169 memcpy(&ip->i_dirent,
170 fcdirentry(bp->b_data, ino >> FILECORE_INO_INDEX),
171 sizeof(struct filecore_direntry));
172 #ifdef FILECORE_DEBUG_BR
173 printf("brelse(%p) vf5\n", bp);
174 #endif
175 brelse(bp, 0);
176 }
177
178 ip->i_mnt = fcmp;
179 ip->i_devvp = fcmp->fc_devvp;
180 ip->i_diroff = 0;
181 vref(ip->i_devvp);
182
183 /*
184 * Initialize the associated vnode
185 */
186
187 vp->v_tag = VT_FILECORE;
188 vp->v_op = filecore_vnodeop_p;
189 vp->v_data = ip;
190 if (ip->i_dirent.attr & FILECORE_ATTR_DIR)
191 vp->v_type = VDIR;
192 else
193 vp->v_type = VREG;
194 if (ino == FILECORE_ROOTINO)
195 vp->v_vflag |= VV_ROOT;
196 genfs_node_init(vp, &filecore_genfsops);
197
198 /*
199 * XXX need generation number?
200 */
201
202 uvm_vnp_setsize(vp, ip->i_size);
203 *new_key = &ip->i_number;
204 return 0;
205 }
206
207 /*
208 * Last reference to an inode, write the inode out and if necessary,
209 * truncate and deallocate the file.
210 */
211 int
filecore_inactive(void * v)212 filecore_inactive(void *v)
213 {
214 struct vop_inactive_v2_args /* {
215 struct vnode *a_vp;
216 bool *a_recycle;
217 } */ *ap = v;
218 struct vnode *vp = ap->a_vp;
219 struct filecore_node *ip = VTOI(vp);
220 int error = 0;
221
222 /*
223 * If we are done with the inode, reclaim it
224 * so that it can be reused immediately.
225 */
226 ip->i_flag = 0;
227 *ap->a_recycle = (filecore_staleinode(ip) != 0);
228
229 return error;
230 }
231
232 /*
233 * Reclaim an inode so that it can be used for other purposes.
234 */
235 int
filecore_reclaim(void * v)236 filecore_reclaim(void *v)
237 {
238 struct vop_reclaim_v2_args /* {
239 struct vnode *a_vp;
240 struct lwp *a_l;
241 } */ *ap = v;
242 struct vnode *vp = ap->a_vp;
243 struct filecore_node *ip = VTOI(vp);
244
245 VOP_UNLOCK(vp);
246
247 /*
248 * Purge old data structures associated with the inode.
249 */
250 if (ip->i_devvp) {
251 vrele(ip->i_devvp);
252 ip->i_devvp = 0;
253 }
254 genfs_node_destroy(vp);
255 pool_put(&filecore_node_pool, vp->v_data);
256 vp->v_data = NULL;
257 return (0);
258 }
259