1130b656e5
This will make a number of things easier in the future, as well as (finally!) avoiding the Id-smashing problem which has plagued developers for so long. Boy, I'm glad we're not using sup anymore. This update would have been insane otherwise.
281 lines
6.4 KiB
C
281 lines
6.4 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 8.4 (Berkeley) 1/21/94
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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/time.h>
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#include <sys/kernel.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/syslog.h>
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#include <sys/mount.h>
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#include <sys/signalvar.h>
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#include <sys/vnode.h>
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#include <miscfs/procfs/procfs.h>
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#include <vm/vm.h> /* for PAGE_SIZE */
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static int procfs_fhtovp __P((struct mount *mp, struct fid *fhp,
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struct mbuf *nam, struct vnode **vpp,
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int *exflagsp, struct ucred **credanonp));
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static int procfs_init __P((void));
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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_quotactl __P((struct mount *mp, int cmds, uid_t uid,
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caddr_t arg, struct proc *p));
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static int procfs_start __P((struct mount *mp, int flags, 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_sync __P((struct mount *mp, int waitfor,
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struct ucred *cred, 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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static int procfs_vget __P((struct mount *mp, ino_t ino,
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struct vnode **vpp));
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static int procfs_vptofh __P((struct vnode *vp, struct fid *fhp));
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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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u_int size;
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if (UIO_MX & (UIO_MX-1)) {
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log(LOG_ERR, "procfs: invalid directory entry size\n");
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return (EINVAL);
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}
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if (mp->mnt_flag & MNT_UPDATE)
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return (EOPNOTSUPP);
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mp->mnt_flag |= MNT_LOCAL;
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mp->mnt_data = 0;
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getnewfsid(mp, MOUNT_PROCFS);
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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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/* procfs can never be rootfs so don't check for it */
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if (!doforce)
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return (EINVAL);
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flags |= FORCECLOSE;
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}
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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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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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struct pfsnode *pfs;
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struct vnode *vp;
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int error;
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error = procfs_allocvp(mp, &vp, (pid_t) 0, Proot);
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if (error)
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return (error);
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vp->v_type = VDIR;
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vp->v_flag = VROOT;
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pfs = VTOPFS(vp);
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*vpp = vp;
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return (0);
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}
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/*
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*/
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/* ARGSUSED */
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static int
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procfs_start(mp, flags, p)
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struct mount *mp;
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int flags;
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struct proc *p;
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{
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return (0);
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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_type = MOUNT_PROCFS;
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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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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 int
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procfs_quotactl(mp, cmds, uid, arg, p)
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struct mount *mp;
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int cmds;
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uid_t uid;
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caddr_t arg;
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struct proc *p;
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{
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return (EOPNOTSUPP);
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}
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static int
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procfs_sync(mp, waitfor, cred, p)
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struct mount *mp;
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int waitfor;
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struct ucred *cred;
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struct proc *p;
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{
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return (0);
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}
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static int
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procfs_vget(mp, ino, vpp)
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struct mount *mp;
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ino_t ino;
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struct vnode **vpp;
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{
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return (EOPNOTSUPP);
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}
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static int
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procfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
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struct mount *mp;
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struct fid *fhp;
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struct mbuf *nam;
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struct vnode **vpp;
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int *exflagsp;
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struct ucred **credanonp;
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{
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return (EINVAL);
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}
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static int
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procfs_vptofh(vp, fhp)
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struct vnode *vp;
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struct fid *fhp;
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{
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return EINVAL;
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}
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static int
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procfs_init()
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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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procfs_start,
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procfs_unmount,
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procfs_root,
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procfs_quotactl,
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procfs_statfs,
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procfs_sync,
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procfs_vget,
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procfs_fhtovp,
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procfs_vptofh,
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procfs_init,
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};
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VFS_SET(procfs_vfsops, procfs, MOUNT_PROCFS, VFCF_SYNTHETIC);
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