2 * Copyright (c) 1993 Jan-Simon Pendry
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
35 * $FreeBSD: src/sys/miscfs/procfs/procfs_vfsops.c,v 1.32.2.1 2001/10/15 20:42:01 des Exp $
39 * procfs VFS interface
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
46 #include <sys/mount.h>
47 #include <sys/vnode.h>
48 #include <vfs/procfs/procfs.h>
50 extern struct vop_ops procfs_vnode_vops
;
52 static int procfs_mount (struct mount
*mp
, char *path
, caddr_t data
,
54 static int procfs_statfs (struct mount
*mp
, struct statfs
*sbp
,
56 static int procfs_unmount (struct mount
*mp
, int mntflags
);
65 procfs_mount(struct mount
*mp
, char *path
, caddr_t data
, struct ucred
*cred
)
70 if (mp
->mnt_flag
& MNT_UPDATE
)
73 if (mp
->mnt_vfc
->vfc_refcount
== 1 && (error
= at_exit(procfs_exit
))) {
74 kprintf("procfs: cannot register procfs_exit with at_exit\n");
78 mp
->mnt_flag
|= MNT_LOCAL
;
79 mp
->mnt_kern_flag
|= MNTK_NOSTKMNT
;
83 size
= sizeof("procfs") - 1;
84 bcopy("procfs", mp
->mnt_stat
.f_mntfromname
, size
);
85 bzero(mp
->mnt_stat
.f_mntfromname
+ size
, MNAMELEN
- size
);
86 procfs_statfs(mp
, &mp
->mnt_stat
, cred
);
87 vfs_add_vnodeops(mp
, &procfs_vnode_vops
, &mp
->mnt_vn_norm_ops
);
96 procfs_unmount(struct mount
*mp
, int mntflags
)
101 if (mntflags
& MNT_FORCE
)
104 error
= vflush(mp
, 0, flags
);
108 if (mp
->mnt_vfc
->vfc_refcount
== 1)
109 rm_at_exit(procfs_exit
);
115 * Sets *vpp to the root procfs vnode, referenced and exclusively locked.
118 procfs_root(struct mount
*mp
, struct vnode
**vpp
)
120 return (procfs_allocvp(mp
, vpp
, 0, Proot
));
124 * Get file system statistics.
127 procfs_statfs(struct mount
*mp
, struct statfs
*sbp
, struct ucred
*cred
)
129 sbp
->f_bsize
= PAGE_SIZE
;
130 sbp
->f_iosize
= PAGE_SIZE
;
131 sbp
->f_blocks
= 1; /* avoid divide by zero in some df's */
134 sbp
->f_files
= maxproc
; /* approx */
135 sbp
->f_ffree
= maxproc
- nprocs
; /* approx */
137 if (sbp
!= &mp
->mnt_stat
) {
138 sbp
->f_type
= mp
->mnt_vfc
->vfc_typenum
;
139 bcopy(&mp
->mnt_stat
.f_fsid
, &sbp
->f_fsid
, sizeof(sbp
->f_fsid
));
140 bcopy(mp
->mnt_stat
.f_mntfromname
, sbp
->f_mntfromname
, MNAMELEN
);
146 static struct vfsops procfs_vfsops
= {
147 .vfs_mount
= procfs_mount
,
148 .vfs_unmount
= procfs_unmount
,
149 .vfs_root
= procfs_root
,
150 .vfs_statfs
= procfs_statfs
,
153 VFS_SET(procfs_vfsops
, procfs
, VFCF_SYNTHETIC
| VFCF_MPSAFE
);
154 MODULE_VERSION(procfs
, 1);