proc->thread stage 4: rework the VFS and DEVICE subsystems to take thread
[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 $
dadab5e9 40 * $DragonFly: src/sys/vfs/procfs/procfs_vfsops.c,v 1.3 2003/06/25 03:56:00 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>
53#include <miscfs/procfs/procfs.h>
54
55static int procfs_mount __P((struct mount *mp, char *path, caddr_t data,
dadab5e9 56 struct nameidata *ndp, struct thread *td));
984263bc 57static int procfs_statfs __P((struct mount *mp, struct statfs *sbp,
dadab5e9 58 struct thread *td));
984263bc 59static int procfs_unmount __P((struct mount *mp, int mntflags,
dadab5e9 60 struct thread *td));
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61
62/*
63 * VFS Operations.
64 *
65 * mount system call
66 */
67/* ARGSUSED */
68static int
dadab5e9 69procfs_mount(mp, path, data, ndp, td)
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70 struct mount *mp;
71 char *path;
72 caddr_t data;
73 struct nameidata *ndp;
dadab5e9 74 struct thread *td;
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75{
76 size_t size;
77 int error;
78
79 if (mp->mnt_flag & MNT_UPDATE)
80 return (EOPNOTSUPP);
81
82 if (mp->mnt_vfc->vfc_refcount == 1 && (error = at_exit(procfs_exit))) {
83 printf("procfs: cannot register procfs_exit with at_exit\n");
84 return(error);
85 }
86
87 mp->mnt_flag |= MNT_LOCAL;
88 mp->mnt_data = 0;
89 vfs_getnewfsid(mp);
90
91 (void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size);
92 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
93
94 size = sizeof("procfs") - 1;
95 bcopy("procfs", mp->mnt_stat.f_mntfromname, size);
96 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
dadab5e9 97 (void)procfs_statfs(mp, &mp->mnt_stat, td);
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98
99 return (0);
100}
101
102/*
103 * unmount system call
104 */
105static int
dadab5e9 106procfs_unmount(mp, mntflags, td)
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107 struct mount *mp;
108 int mntflags;
dadab5e9 109 struct thread *td;
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110{
111 int error;
112 int flags = 0;
113
114 if (mntflags & MNT_FORCE)
115 flags |= FORCECLOSE;
116
117 error = vflush(mp, 0, flags);
118 if (error)
119 return (error);
120
121 if (mp->mnt_vfc->vfc_refcount == 1)
122 rm_at_exit(procfs_exit);
123
124 return (0);
125}
126
127int
128procfs_root(mp, vpp)
129 struct mount *mp;
130 struct vnode **vpp;
131{
132
133 return (procfs_allocvp(mp, vpp, 0, Proot));
134}
135
136/*
137 * Get file system statistics.
138 */
139static int
dadab5e9 140procfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
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141{
142 sbp->f_bsize = PAGE_SIZE;
143 sbp->f_iosize = PAGE_SIZE;
144 sbp->f_blocks = 1; /* avoid divide by zero in some df's */
145 sbp->f_bfree = 0;
146 sbp->f_bavail = 0;
147 sbp->f_files = maxproc; /* approx */
148 sbp->f_ffree = maxproc - nprocs; /* approx */
149
150 if (sbp != &mp->mnt_stat) {
151 sbp->f_type = mp->mnt_vfc->vfc_typenum;
152 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
153 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
154 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
155 }
156
157 return (0);
158}
159
160static struct vfsops procfs_vfsops = {
161 procfs_mount,
162 vfs_stdstart,
163 procfs_unmount,
164 procfs_root,
165 vfs_stdquotactl,
166 procfs_statfs,
167 vfs_stdsync,
168 vfs_stdvget,
169 vfs_stdfhtovp,
170 vfs_stdcheckexp,
171 vfs_stdvptofh,
172 vfs_stdinit,
173 vfs_stduninit,
174 vfs_stdextattrctl,
175};
176
177VFS_SET(procfs_vfsops, procfs, VFCF_SYNTHETIC);
178MODULE_VERSION(procfs, 1);