VFS messaging/interfacing work stage 4/99. This stage goes a long ways
[dragonfly.git] / sys / vfs / procfs / procfs_vfsops.c
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1/*
2 * Copyright (c) 1993 Jan-Simon Pendry
3 * Copyright (c) 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * This code is derived from software contributed to Berkeley by
7 * Jan-Simon Pendry.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed by the University of
20 * California, Berkeley and its contributors.
21 * 4. Neither the name of the University nor the names of its contributors
22 * may be used to endorse or promote products derived from this software
23 * without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35 * SUCH DAMAGE.
36 *
37 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
38 *
39 * $FreeBSD: src/sys/miscfs/procfs/procfs_vfsops.c,v 1.32.2.1 2001/10/15 20:42:01 des Exp $
3446c007 40 * $DragonFly: src/sys/vfs/procfs/procfs_vfsops.c,v 1.8 2004/08/28 19:02:27 dillon Exp $
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41 */
42
43/*
44 * procfs VFS interface
45 */
46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/kernel.h>
50#include <sys/proc.h>
51#include <sys/mount.h>
52#include <sys/vnode.h>
1f2de5d4 53#include <vfs/procfs/procfs.h>
984263bc 54
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55extern struct vnodeopv_entry_desc procfs_vnodeop_entries[];
56
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57static int procfs_mount (struct mount *mp, char *path, caddr_t data,
58 struct nameidata *ndp, struct thread *td);
59static int procfs_statfs (struct mount *mp, struct statfs *sbp,
60 struct thread *td);
61static int procfs_unmount (struct mount *mp, int mntflags,
62 struct thread *td);
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63
64/*
65 * VFS Operations.
66 *
67 * mount system call
68 */
69/* ARGSUSED */
70static int
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71procfs_mount(struct mount *mp, char *path, caddr_t data, struct nameidata *ndp,
72 struct thread *td)
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73{
74 size_t size;
75 int error;
76
77 if (mp->mnt_flag & MNT_UPDATE)
78 return (EOPNOTSUPP);
79
80 if (mp->mnt_vfc->vfc_refcount == 1 && (error = at_exit(procfs_exit))) {
81 printf("procfs: cannot register procfs_exit with at_exit\n");
82 return(error);
83 }
84
85 mp->mnt_flag |= MNT_LOCAL;
86 mp->mnt_data = 0;
87 vfs_getnewfsid(mp);
88
89 (void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size);
90 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
91
92 size = sizeof("procfs") - 1;
93 bcopy("procfs", mp->mnt_stat.f_mntfromname, size);
94 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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95 procfs_statfs(mp, &mp->mnt_stat, td);
96 vfs_add_vnodeops(&mp->mnt_vn_ops, procfs_vnodeop_entries);
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97
98 return (0);
99}
100
101/*
102 * unmount system call
103 */
104static int
ac424f9b 105procfs_unmount(struct mount *mp, int mntflags, struct thread *td)
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106{
107 int error;
108 int flags = 0;
109
110 if (mntflags & MNT_FORCE)
111 flags |= FORCECLOSE;
112
113 error = vflush(mp, 0, flags);
114 if (error)
115 return (error);
116
117 if (mp->mnt_vfc->vfc_refcount == 1)
118 rm_at_exit(procfs_exit);
119
120 return (0);
121}
122
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123/*
124 * Sets *vpp to the root procfs vnode, referenced and exclusively locked.
125 */
984263bc 126int
ac424f9b 127procfs_root(struct mount *mp, struct vnode **vpp)
984263bc 128{
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129 return (procfs_allocvp(mp, vpp, 0, Proot));
130}
131
132/*
133 * Get file system statistics.
134 */
135static int
dadab5e9 136procfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
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137{
138 sbp->f_bsize = PAGE_SIZE;
139 sbp->f_iosize = PAGE_SIZE;
140 sbp->f_blocks = 1; /* avoid divide by zero in some df's */
141 sbp->f_bfree = 0;
142 sbp->f_bavail = 0;
143 sbp->f_files = maxproc; /* approx */
144 sbp->f_ffree = maxproc - nprocs; /* approx */
145
146 if (sbp != &mp->mnt_stat) {
147 sbp->f_type = mp->mnt_vfc->vfc_typenum;
148 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
149 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
150 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
151 }
152
153 return (0);
154}
155
156static struct vfsops procfs_vfsops = {
157 procfs_mount,
158 vfs_stdstart,
159 procfs_unmount,
160 procfs_root,
161 vfs_stdquotactl,
162 procfs_statfs,
163 vfs_stdsync,
164 vfs_stdvget,
165 vfs_stdfhtovp,
166 vfs_stdcheckexp,
167 vfs_stdvptofh,
168 vfs_stdinit,
169 vfs_stduninit,
170 vfs_stdextattrctl,
171};
172
173VFS_SET(procfs_vfsops, procfs, VFCF_SYNTHETIC);
174MODULE_VERSION(procfs, 1);