c24fda81c9
VFS_CHECKEXP. Add fh(open|stat|stafs) syscalls to allow userland to query filesystems based on (network) filehandle. Obtained from: NetBSD
179 lines
4.7 KiB
C
179 lines
4.7 KiB
C
/*
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* Copyright (c) 1993 Jan-Simon Pendry
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* Copyright (c) 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)procfs_vfsops.c 8.7 (Berkeley) 5/10/95
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*
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* $FreeBSD$
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*/
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/*
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* procfs VFS interface
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/syslog.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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#include <miscfs/procfs/procfs.h>
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static int procfs_mount __P((struct mount *mp, char *path, caddr_t data,
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struct nameidata *ndp, struct proc *p));
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static int procfs_statfs __P((struct mount *mp, struct statfs *sbp,
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struct proc *p));
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static int procfs_unmount __P((struct mount *mp, int mntflags,
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struct proc *p));
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/*
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* VFS Operations.
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*
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* mount system call
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*/
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/* ARGSUSED */
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static int
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procfs_mount(mp, path, data, ndp, p)
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struct mount *mp;
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char *path;
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caddr_t data;
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struct nameidata *ndp;
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struct proc *p;
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{
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size_t size;
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int error;
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if (mp->mnt_flag & MNT_UPDATE)
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return (EOPNOTSUPP);
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if (mp->mnt_vfc->vfc_refcount == 1 && (error = at_exit(procfs_exit))) {
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printf("procfs: cannot register procfs_exit with at_exit\n");
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return(error);
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}
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = 0;
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vfs_getnewfsid(mp);
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(void) copyinstr(path, (caddr_t)mp->mnt_stat.f_mntonname, MNAMELEN, &size);
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bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
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size = sizeof("procfs") - 1;
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bcopy("procfs", mp->mnt_stat.f_mntfromname, size);
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bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
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(void)procfs_statfs(mp, &mp->mnt_stat, p);
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return (0);
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}
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/*
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* unmount system call
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*/
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static int
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procfs_unmount(mp, mntflags, p)
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struct mount *mp;
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int mntflags;
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struct proc *p;
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{
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int error;
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int flags = 0;
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if (mntflags & MNT_FORCE)
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flags |= FORCECLOSE;
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error = vflush(mp, 0, flags);
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if (error)
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return (error);
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if (mp->mnt_vfc->vfc_refcount == 1)
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rm_at_exit(procfs_exit);
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return (0);
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}
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int
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procfs_root(mp, vpp)
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struct mount *mp;
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struct vnode **vpp;
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{
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return (procfs_allocvp(mp, vpp, 0, Proot));
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}
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/*
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* Get file system statistics.
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*/
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static int
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procfs_statfs(mp, sbp, p)
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struct mount *mp;
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struct statfs *sbp;
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struct proc *p;
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{
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sbp->f_bsize = PAGE_SIZE;
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sbp->f_iosize = PAGE_SIZE;
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sbp->f_blocks = 1; /* avoid divide by zero in some df's */
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sbp->f_bfree = 0;
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sbp->f_bavail = 0;
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sbp->f_files = maxproc; /* approx */
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sbp->f_ffree = maxproc - nprocs; /* approx */
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if (sbp != &mp->mnt_stat) {
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sbp->f_type = mp->mnt_vfc->vfc_typenum;
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bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
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bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
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bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
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}
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return (0);
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}
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static struct vfsops procfs_vfsops = {
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procfs_mount,
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vfs_stdstart,
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procfs_unmount,
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procfs_root,
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vfs_stdquotactl,
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procfs_statfs,
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vfs_stdsync,
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vfs_stdvget,
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vfs_stdfhtovp,
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vfs_stdcheckexp,
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vfs_stdvptofh,
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vfs_stdinit,
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};
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VFS_SET(procfs_vfsops, procfs, VFCF_SYNTHETIC);
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