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/* $OpenBSD: procfs_vfsops.c,v 1.31 2014/07/08 17:19:25 deraadt Exp $ */
/* $NetBSD: procfs_vfsops.c,v 1.25 1996/02/09 22:40:53 christos Exp $ */
/*
* Copyright (c) 1993 Jan-Simon Pendry
* 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 8.5 (Berkeley) 6/15/94
*/
/*
* procfs VFS interface
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/buf.h>
#include <sys/syslog.h>
#include <sys/mount.h>
#include <sys/signalvar.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <miscfs/procfs/procfs.h>
int procfs_mount(struct mount *, const char *, void *,
struct nameidata *, struct proc *);
int procfs_start(struct mount *, int, struct proc *);
int procfs_unmount(struct mount *, int, struct proc *);
int procfs_statfs(struct mount *, struct statfs *, struct proc *);
/*
* VFS Operations.
*
* mount system call
*/
/* ARGSUSED */
int
procfs_mount(struct mount *mp, const char *path, void *data, struct nameidata *ndp,
struct proc *p)
{
struct procfsmount *pmnt;
struct procfs_args args;
int error;
if (UIO_MX & (UIO_MX-1)) {
log(LOG_ERR, "procfs: invalid directory entry size");
return (EINVAL);
}
if (mp->mnt_flag & MNT_UPDATE)
return (EOPNOTSUPP);
if (data != NULL) {
error = copyin(data, &args, sizeof(args));
if (error != 0)
return (error);
if (args.version != PROCFS_ARGSVERSION)
return (EINVAL);
} else
args.flags = 0;
mp->mnt_flag |= MNT_LOCAL;
pmnt = (struct procfsmount *) malloc(sizeof(struct procfsmount),
M_MISCFSMNT, M_WAITOK);
mp->mnt_data = pmnt;
vfs_getnewfsid(mp);
bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
strlcpy(mp->mnt_stat.f_mntonname, path, MNAMELEN);
bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
bcopy("procfs", mp->mnt_stat.f_mntfromname, sizeof("procfs"));
bzero(mp->mnt_stat.f_mntfromspec, MNAMELEN);
bcopy("procfs", mp->mnt_stat.f_mntfromspec, sizeof("procfs"));
bcopy(&args, &mp->mnt_stat.mount_info.procfs_args, sizeof(args));
#ifdef notyet
pmnt->pmnt_exechook = exechook_establish(procfs_revoke_vnodes, mp);
#endif
pmnt->pmnt_flags = args.flags;
return (0);
}
/*
* unmount system call
*/
int
procfs_unmount(struct mount *mp, int mntflags, struct proc *p)
{
int error;
extern int doforce;
int flags = 0;
if (mntflags & MNT_FORCE) {
/* procfs can never be rootfs so don't check for it */
if (!doforce)
return (EINVAL);
flags |= FORCECLOSE;
}
if ((error = vflush(mp, 0, flags)) != 0)
return (error);
free(VFSTOPROC(mp), M_MISCFSMNT);
mp->mnt_data = 0;
return (0);
}
int
procfs_root(struct mount *mp, struct vnode **vpp)
{
int error;
error = procfs_allocvp(mp, vpp, 0, Proot);
if (error)
return (error);
vn_lock(*vpp, LK_EXCLUSIVE | LK_RETRY, curproc);
return (0);
}
/* ARGSUSED */
int
procfs_start(struct mount *mp, int flags, struct proc *p)
{
return (0);
}
/*
* Get file system statistics.
*/
int
procfs_statfs(struct mount *mp, struct statfs *sbp, struct proc *p)
{
sbp->f_bsize = PAGE_SIZE;
sbp->f_iosize = PAGE_SIZE;
sbp->f_blocks = uvmexp.npages - uvmexp.free + uvmexp.swpginuse;
sbp->f_bfree = uvmexp.npages - uvmexp.free - uvmexp.active;
sbp->f_bavail = 0;
sbp->f_files = maxprocess; /* approx */
sbp->f_ffree = maxprocess - nprocesses; /* approx */
if (sbp != &mp->mnt_stat) {
bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromspec, sbp->f_mntfromspec, MNAMELEN);
bcopy(&mp->mnt_stat.mount_info.procfs_args,
&sbp->mount_info.procfs_args, sizeof(struct procfs_args));
}
strncpy(sbp->f_fstypename, mp->mnt_vfc->vfc_name, MFSNAMELEN);
return (0);
}
#define procfs_sync ((int (*)(struct mount *, int, struct ucred *, \
struct proc *))nullop)
#define procfs_fhtovp ((int (*)(struct mount *, struct fid *, \
struct vnode **))eopnotsupp)
#define procfs_quotactl ((int (*)(struct mount *, int, uid_t, caddr_t, \
struct proc *))eopnotsupp)
#define procfs_sysctl ((int (*)(int *, u_int, void *, size_t *, void *, \
size_t, struct proc *))eopnotsupp)
#define procfs_vget ((int (*)(struct mount *, ino_t, struct vnode **)) \
eopnotsupp)
#define procfs_vptofh ((int (*)(struct vnode *, struct fid *))eopnotsupp)
#define procfs_checkexp ((int (*)(struct mount *, struct mbuf *, \
int *, struct ucred **))eopnotsupp)
const struct vfsops procfs_vfsops = {
procfs_mount,
procfs_start,
procfs_unmount,
procfs_root,
procfs_quotactl,
procfs_statfs,
procfs_sync,
procfs_vget,
procfs_fhtovp,
procfs_vptofh,
procfs_init,
procfs_sysctl,
procfs_checkexp
};
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