sys/emulation/linux/i386/linprocfs/linprocfs_vfsops.c

   1 /*
   2  * Copyright (c) 2000 Dag-Erling Coïdan Smørgrav
   3  * Copyright (c) 1999 Pierre Beyssac
   4  * Copyright (c) 1993 Jan-Simon Pendry
   5  * Copyright (c) 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Jan-Simon Pendry.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  * 4. Neither the name of the University nor the names of its contributors
  24  *    may be used to endorse or promote products derived from this software
  25  *    without specific prior written permission.
  26  *
  27  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  28  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  29  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  30  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  31  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  32  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  33  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  34  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  35  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  36  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  37  * SUCH DAMAGE.
  38  *
  39  *      @(#)procfs_vfsops.c     8.7 (Berkeley) 5/10/95
  40  *
  41  * $FreeBSD: src/sys/i386/linux/linprocfs/linprocfs_vfsops.c,v 1.2.2.3 2001/10/15 20:42:01 des Exp $
  42  */
  43
  44 /*
  45  * procfs VFS interface
  46  */
  47
  48 #include <sys/param.h>
  49 #include <sys/systm.h>
  50 #include <sys/kernel.h>
  51 #include <sys/proc.h>
  52 #include <sys/syslog.h>
  53 #include <sys/mount.h>
  54 #include <sys/vnode.h>
  55 #include "linprocfs.h"
  56
  57 extern struct vop_ops linprocfs_vnode_vops;
  58
  59 static int      linprocfs_mount (struct mount *mp, char *path, caddr_t data,
  60                                   struct ucred *cred);
  61 static int      linprocfs_statfs (struct mount *mp, struct statfs *sbp,
  62                                    struct ucred *cred);
  63 static int      linprocfs_unmount (struct mount *mp, int mntflags);
  64
  65 /*
  66  * VFS Operations.
  67  *
  68  * mount system call
  69  */
  70 /* ARGSUSED */
  71 static int
  72 linprocfs_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
  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(linprocfs_exit))) {
  81                 kprintf("linprocfs:  cannot register linprocfs_exit with at_exit\n");
  82                 return(error);
  83         }
  84
  85         mp->mnt_flag |= MNT_LOCAL;
  86         mp->mnt_kern_flag |= MNTK_NOSTKMNT;
  87         mp->mnt_data = 0;
  88         vfs_getnewfsid(mp);
  89
  90         vfs_add_vnodeops(mp, &linprocfs_vnode_vops, &mp->mnt_vn_norm_ops);
  91
  92         size = sizeof("linprocfs") - 1;
  93         bcopy("linprocfs", mp->mnt_stat.f_mntfromname, size);
  94         bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
  95         (void)linprocfs_statfs(mp, &mp->mnt_stat, cred);
  96
  97         return (0);
  98 }
  99
 100 /*
 101  * unmount system call
 102  */
 103 static int
 104 linprocfs_unmount(struct mount *mp, int mntflags)
 105 {
 106         int error;
 107         int flags = 0;
 108
 109         if (mntflags & MNT_FORCE)
 110                 flags |= FORCECLOSE;
 111
 112         error = vflush(mp, 0, flags);
 113         if (error)
 114                 return (error);
 115
 116         if (mp->mnt_vfc->vfc_refcount == 1)
 117                 rm_at_exit(linprocfs_exit);
 118
 119         return (0);
 120 }
 121
 122 int
 123 linprocfs_root(struct mount *mp, struct vnode **vpp)
 124 {
 125
 126         return (linprocfs_allocvp(mp, vpp, 0, Proot));
 127 }
 128
 129 /*
 130  * Get file system statistics.
 131  */
 132 static int
 133 linprocfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 134 {
 135         sbp->f_bsize = PAGE_SIZE;
 136         sbp->f_iosize = PAGE_SIZE;
 137         sbp->f_blocks = 1;      /* avoid divide by zero in some df's */
 138         sbp->f_bfree = 0;
 139         sbp->f_bavail = 0;
 140         sbp->f_files = maxproc;                 /* approx */
 141         sbp->f_ffree = maxproc - nprocs;        /* approx */
 142
 143         if (sbp != &mp->mnt_stat) {
 144                 sbp->f_type = mp->mnt_vfc->vfc_typenum;
 145                 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
 146                 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
 147         }
 148
 149         return (0);
 150 }
 151
 152 static struct vfsops linprocfs_vfsops = {
 153         linprocfs_mount,
 154         vfs_stdstart,
 155         linprocfs_unmount,
 156         linprocfs_root,
 157         vfs_stdquotactl,
 158         linprocfs_statfs,
 159         vfs_stdsync,
 160         vfs_stdvget,
 161         vfs_stdfhtovp,
 162         vfs_stdcheckexp,
 163         vfs_stdvptofh,
 164         vfs_stdinit,
 165 };
 166
 167 VFS_SET(linprocfs_vfsops, linprocfs, VFCF_SYNTHETIC);
 168 MODULE_VERSION(linprocfs, 1);
 169 MODULE_DEPEND(linprocfs, linux, 1, 1, 1);
 170 MODULE_DEPEND(linprocfs, procfs, 1, 1, 1);