NetBSD-5.0.2/sys/miscfs/procfs/procfs_vfsops.c
/* $NetBSD: procfs_vfsops.c,v 1.81 2008/06/28 01:34:06 rumble Exp $ */
/*
* Copyright (c) 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
*/
/*
* Copyright (c) 1993 Jan-Simon Pendry
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
*/
/*
* procfs VFS interface
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: procfs_vfsops.c,v 1.81 2008/06/28 01:34:06 rumble Exp $");
#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif
#include <sys/param.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/syslog.h>
#include <sys/mount.h>
#include <sys/dirent.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/kauth.h>
#include <sys/module.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/procfs/procfs.h>
#include <uvm/uvm_extern.h> /* for PAGE_SIZE */
MODULE(MODULE_CLASS_VFS, procfs, NULL);
VFS_PROTOS(procfs);
static struct sysctllog *procfs_sysctl_log;
/*
* VFS Operations.
*
* mount system call
*/
/* ARGSUSED */
int
procfs_mount(
struct mount *mp,
const char *path,
void *data,
size_t *data_len)
{
struct lwp *l = curlwp;
struct procfsmount *pmnt;
struct procfs_args *args = data;
int error;
if (UIO_MX & (UIO_MX-1)) {
log(LOG_ERR, "procfs: invalid directory entry size");
return (EINVAL);
}
if (mp->mnt_flag & MNT_GETARGS) {
if (*data_len < sizeof *args)
return EINVAL;
pmnt = VFSTOPROC(mp);
if (pmnt == NULL)
return EIO;
args->version = PROCFS_ARGSVERSION;
args->flags = pmnt->pmnt_flags;
*data_len = sizeof *args;
return 0;
}
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
if (*data_len >= sizeof *args && args->version != PROCFS_ARGSVERSION)
return EINVAL;
pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount),
M_UFSMNT, M_WAITOK); /* XXX need new malloc type */
mp->mnt_stat.f_namemax = MAXNAMLEN;
mp->mnt_flag |= MNT_LOCAL;
mp->mnt_data = pmnt;
vfs_getnewfsid(mp);
error = set_statvfs_info(path, UIO_USERSPACE, "procfs", UIO_SYSSPACE,
mp->mnt_op->vfs_name, mp, l);
pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp);
if (*data_len >= sizeof *args)
pmnt->pmnt_flags = args->flags;
else
pmnt->pmnt_flags = 0;
mp->mnt_iflag |= IMNT_MPSAFE;
return error;
}
/*
* unmount system call
*/
int
procfs_unmount(struct mount *mp, int mntflags)
{
int error;
int flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
if ((error = vflush(mp, 0, flags)) != 0)
return (error);
exechook_disestablish(VFSTOPROC(mp)->pmnt_exechook);
free(mp->mnt_data, M_UFSMNT);
mp->mnt_data = NULL;
return (0);
}
int
procfs_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
return (procfs_allocvp(mp, vpp, 0, PFSroot, -1, NULL));
}
/* ARGSUSED */
int
procfs_start(struct mount *mp, int flags)
{
return (0);
}
/*
* Get file system statistics.
*/
int
procfs_statvfs(struct mount *mp, struct statvfs *sbp)
{
sbp->f_bsize = PAGE_SIZE;
sbp->f_frsize = PAGE_SIZE;
sbp->f_iosize = PAGE_SIZE;
sbp->f_blocks = 1; /* avoid divide by zero in some df's */
sbp->f_bfree = 0;
sbp->f_bavail = 0;
sbp->f_bresvd = 0;
sbp->f_files = maxproc; /* approx */
sbp->f_ffree = maxproc - nprocs; /* approx */
sbp->f_favail = maxproc - nprocs; /* approx */
sbp->f_fresvd = 0;
copy_statvfs_info(sbp, mp);
return (0);
}
/*ARGSUSED*/
int
procfs_sync(
struct mount *mp,
int waitfor,
kauth_cred_t uc)
{
return (0);
}
/*ARGSUSED*/
int
procfs_vget(struct mount *mp, ino_t ino,
struct vnode **vpp)
{
return (EOPNOTSUPP);
}
void
procfs_init()
{
procfs_hashinit();
}
void
procfs_reinit()
{
procfs_hashreinit();
}
void
procfs_done()
{
procfs_hashdone();
}
extern const struct vnodeopv_desc procfs_vnodeop_opv_desc;
const struct vnodeopv_desc * const procfs_vnodeopv_descs[] = {
&procfs_vnodeop_opv_desc,
NULL,
};
struct vfsops procfs_vfsops = {
MOUNT_PROCFS,
sizeof (struct procfs_args),
procfs_mount,
procfs_start,
procfs_unmount,
procfs_root,
(void *)eopnotsupp, /* vfs_quotactl */
procfs_statvfs,
procfs_sync,
procfs_vget,
(void *)eopnotsupp, /* vfs_fhtovp */
(void *)eopnotsupp, /* vfs_vptofh */
procfs_init,
procfs_reinit,
procfs_done,
NULL, /* vfs_mountroot */
(int (*)(struct mount *, struct vnode *, struct timespec *)) eopnotsupp,
vfs_stdextattrctl,
(void *)eopnotsupp, /* vfs_suspendctl */
genfs_renamelock_enter,
genfs_renamelock_exit,
(void *)eopnotsupp,
procfs_vnodeopv_descs,
0,
{ NULL, NULL },
};
static int
procfs_modcmd(modcmd_t cmd, void *arg)
{
int error;
switch (cmd) {
case MODULE_CMD_INIT:
error = vfs_attach(&procfs_vfsops);
if (error != 0)
break;
sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "vfs", NULL,
NULL, 0, NULL, 0,
CTL_VFS, CTL_EOL);
sysctl_createv(&procfs_sysctl_log, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "procfs",
SYSCTL_DESCR("Process file system"),
NULL, 0, NULL, 0,
CTL_VFS, 12, CTL_EOL);
/*
* XXX the "12" above could be dynamic, thereby eliminating
* one more instance of the "number to vfs" mapping problem,
* but "12" is the order as taken from sys/mount.h
*/
break;
case MODULE_CMD_FINI:
error = vfs_detach(&procfs_vfsops);
if (error != 0)
break;
sysctl_teardown(&procfs_sysctl_log);
break;
default:
error = ENOTTY;
break;
}
return (error);
}