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
90struct pool		filecore_node_pool;
91
92static const struct genfs_ops filecore_genfsops = {
93        .gop_size = genfs_size,
94};
95
96/*
97 * Initialize hash links for inodes and dnodes.
98 */
99void
100filecore_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 */
110void
111filecore_reinit(void)
112{
113
114}
115
116/*
117 * Destroy node pool and hash table.
118 */
119void
120filecore_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 */
130int
131filecore_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 */
211int
212filecore_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 */
235int
236filecore_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