pseudofs.c revision 75295 
1/*-
2 * Copyright (c) 2001 Dag-Erling Co�dan Sm�rgrav
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 *	$FreeBSD: head/sys/fs/pseudofs/pseudofs.c 75295 2001-04-07 19:51:12Z des $
29 */
30
31#include <sys/param.h>
32#include <sys/kernel.h>
33#include <sys/systm.h>
34#include <sys/malloc.h>
35#include <sys/module.h>
36#include <sys/mount.h>
37#include <sys/proc.h>
38#include <sys/sbuf.h>
39#include <sys/sysctl.h>
40#include <sys/vnode.h>
41
42#include <fs/pseudofs/pseudofs.h>
43#include <fs/pseudofs/pseudofs_internal.h>
44
45SYSCTL_NODE(_vfs, OID_AUTO, pfs, CTLFLAG_RW, 0,
46    "pseudofs");
47
48/*
49 * Mount a pseudofs instance
50 */
51int
52pfs_mount(struct pfs_info *pi, struct mount *mp, char *path, caddr_t data,
53	  struct nameidata *ndp, struct proc *p)
54{
55	struct statfs *sbp;
56
57	if (mp->mnt_flag & MNT_UPDATE)
58		return (EOPNOTSUPP);
59
60	mp->mnt_flag |= MNT_LOCAL;
61	mp->mnt_data = (qaddr_t)pi;
62	vfs_getnewfsid(mp);
63
64	sbp = &mp->mnt_stat;
65	bcopy(pi->pi_name, sbp->f_mntfromname, sizeof pi->pi_name);
66	sbp->f_bsize = PAGE_SIZE;
67	sbp->f_iosize = PAGE_SIZE;
68	sbp->f_blocks = 1;
69	sbp->f_bfree = 0;
70	sbp->f_bavail = 0;
71	sbp->f_files = 1;
72	sbp->f_ffree = 0;
73
74	return (0);
75}
76
77/*
78 * Unmount a pseudofs instance
79 */
80int
81pfs_unmount(struct mount *mp, int mntflags, struct proc *p)
82{
83	struct pfs_info *pi;
84	int error;
85
86	pi = (struct pfs_info *)mp->mnt_data;
87
88	/* XXX do stuff with pi... */
89
90	error = vflush(mp, 0, (mntflags & MNT_FORCE) ?  FORCECLOSE : 0);
91	return (error);
92}
93
94/*
95 * Return a root vnode
96 */
97int
98pfs_root(struct mount *mp, struct vnode **vpp)
99{
100	struct pfs_info *pi;
101
102	pi = (struct pfs_info *)mp->mnt_data;
103	return pfs_vncache_alloc(mp, vpp, pi->pi_root);
104}
105
106/*
107 * Return filesystem stats
108 */
109int
110pfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
111{
112	bcopy(&mp->mnt_stat, sbp, sizeof *sbp);
113	return (0);
114}
115
116/*
117 * Initialize a pseudofs instance
118 */
119int
120pfs_init(struct pfs_info *pi, struct vfsconf *vfc)
121{
122	mtx_init(&pi->pi_mutex, "pseudofs", MTX_DEF);
123	pfs_fileno_init(pi);
124	printf("%s registered\n", pi->pi_name);
125	return (0);
126}
127
128/*
129 * Destroy a pseudofs instance
130 */
131int
132pfs_uninit(struct pfs_info *pi, struct vfsconf *vfc)
133{
134	pfs_fileno_uninit(pi);
135	mtx_destroy(&pi->pi_mutex);
136	printf("%s unregistered\n", pi->pi_name);
137	return (0);
138}
139
140/*
141 * Handle load / unload events
142 */
143static int
144pfs_modevent(module_t mod, int evt, void *arg)
145{
146	switch (evt) {
147	case MOD_LOAD:
148		pfs_fileno_load();
149		pfs_vncache_load();
150		break;
151	case MOD_UNLOAD:
152	case MOD_SHUTDOWN:
153		pfs_vncache_unload();
154		pfs_fileno_unload();
155		break;
156	default:
157		printf("pseudofs: unexpected event type %d\n", evt);
158		break;
159	}
160	return 0;
161}
162
163/*
164 * Module declaration
165 */
166static moduledata_t pseudofs_data = {
167	"pseudofs",
168	pfs_modevent,
169	NULL
170};
171DECLARE_MODULE(pseudofs, pseudofs_data, SI_SUB_EXEC, SI_ORDER_FIRST);
172MODULE_VERSION(pseudofs, 1);
173