275 lines
6.4 KiB
C
275 lines
6.4 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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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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* from: @(#)mfs_vnops.c 7.22 (Berkeley) 4/16/91
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* $Id: mfs_vnops.c,v 1.3 1993/08/24 14:54:14 mycroft Exp $
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*/
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#include "param.h"
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#include "systm.h"
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#include "time.h"
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#include "kernel.h"
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#include "proc.h"
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#include "buf.h"
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#include "vnode.h"
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#include "mfsnode.h"
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#include "mfsiom.h"
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#include "machine/vmparam.h"
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/*
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* mfs vnode operations.
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*/
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struct vnodeops mfs_vnodeops = {
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mfs_lookup, /* lookup */
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mfs_create, /* create */
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mfs_mknod, /* mknod */
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mfs_open, /* open */
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mfs_close, /* close */
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mfs_access, /* access */
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mfs_getattr, /* getattr */
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mfs_setattr, /* setattr */
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mfs_read, /* read */
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mfs_write, /* write */
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mfs_ioctl, /* ioctl */
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mfs_select, /* select */
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mfs_mmap, /* mmap */
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mfs_fsync, /* fsync */
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mfs_seek, /* seek */
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mfs_remove, /* remove */
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mfs_link, /* link */
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mfs_rename, /* rename */
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mfs_mkdir, /* mkdir */
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mfs_rmdir, /* rmdir */
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mfs_symlink, /* symlink */
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mfs_readdir, /* readdir */
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mfs_readlink, /* readlink */
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mfs_abortop, /* abortop */
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mfs_inactive, /* inactive */
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mfs_reclaim, /* reclaim */
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mfs_lock, /* lock */
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mfs_unlock, /* unlock */
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mfs_bmap, /* bmap */
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mfs_strategy, /* strategy */
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mfs_print, /* print */
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mfs_islocked, /* islocked */
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mfs_advlock, /* advlock */
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};
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/*
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* Vnode Operations.
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*
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* Open called to allow memory filesystem to initialize and
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* validate before actual IO. Record our process identifier
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* so we can tell when we are doing I/O to ourself.
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*/
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/* ARGSUSED */
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mfs_open(vp, mode, cred, p)
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register struct vnode *vp;
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int mode;
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struct ucred *cred;
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struct proc *p;
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{
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if (vp->v_type != VBLK) {
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panic("mfs_ioctl not VBLK");
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/* NOTREACHED */
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}
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return (0);
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}
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/*
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* Ioctl operation.
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*/
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/* ARGSUSED */
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mfs_ioctl(vp, com, data, fflag, cred, p)
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struct vnode *vp;
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int com;
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caddr_t data;
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int fflag;
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struct ucred *cred;
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struct proc *p;
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{
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return (-1);
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}
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/*
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* Pass I/O requests to the memory filesystem process.
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*/
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mfs_strategy(bp)
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register struct buf *bp;
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{
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register struct mfsnode *mfsp;
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struct vnode *vp;
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struct proc *p = curproc; /* XXX */
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if (vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
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panic("mfs_strategy: bad dev");
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mfsp = VTOMFS(vp);
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if (mfsp->mfs_pid == p->p_pid) {
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mfs_doio(bp, mfsp->mfs_baseoff);
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} else {
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bp->av_forw = mfsp->mfs_buflist;
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mfsp->mfs_buflist = bp;
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wakeup((caddr_t)vp);
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}
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return (0);
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}
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/*
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* Memory file system I/O.
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*
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* Trivial since buffer has already been mapping into KVA space.
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*/
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mfs_doio(bp, base)
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register struct buf *bp;
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caddr_t base;
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{
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base += (bp->b_blkno << DEV_BSHIFT);
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if (bp->b_flags & B_READ)
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bp->b_error = copyin(base, bp->b_un.b_addr, bp->b_bcount);
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else
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bp->b_error = copyout(bp->b_un.b_addr, base, bp->b_bcount);
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if (bp->b_error)
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bp->b_flags |= B_ERROR;
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biodone(bp);
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}
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/*
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* This is a noop, simply returning what one has been given.
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*/
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mfs_bmap(vp, bn, vpp, bnp)
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struct vnode *vp;
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daddr_t bn;
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struct vnode **vpp;
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daddr_t *bnp;
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{
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if (vpp != NULL)
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*vpp = vp;
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if (bnp != NULL)
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*bnp = bn;
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return (0);
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}
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/*
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* Memory filesystem close routine
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*/
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/* ARGSUSED */
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mfs_close(vp, flag, cred, p)
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register struct vnode *vp;
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int flag;
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struct ucred *cred;
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struct proc *p;
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{
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register struct mfsnode *mfsp = VTOMFS(vp);
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register struct buf *bp;
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/*
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* Finish any pending I/O requests.
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*/
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while (bp = mfsp->mfs_buflist) {
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mfsp->mfs_buflist = bp->av_forw;
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mfs_doio(bp, mfsp->mfs_baseoff);
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wakeup((caddr_t)bp);
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}
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/*
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* On last close of a memory filesystem
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* we must invalidate any in core blocks, so that
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* we can, free up its vnode.
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*/
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vflushbuf(vp, 0);
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if (vinvalbuf(vp, 1))
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return (0);
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/*
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* There should be no way to have any more uses of this
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* vnode, so if we find any other uses, it is a panic.
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*/
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if (vp->v_usecount > 1)
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printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
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if (vp->v_usecount > 1 || mfsp->mfs_buflist)
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panic("mfs_close");
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/*
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* Send a request to the filesystem server to exit.
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*/
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mfsp->mfs_buflist = (struct buf *)(-1);
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wakeup((caddr_t)vp);
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return (0);
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}
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/*
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* Memory filesystem inactive routine
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*/
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/* ARGSUSED */
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mfs_inactive(vp, p)
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struct vnode *vp;
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struct proc *p;
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{
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if (VTOMFS(vp)->mfs_buflist != (struct buf *)(-1))
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panic("mfs_inactive: not inactive");
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return (0);
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}
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/*
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* Print out the contents of an mfsnode.
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*/
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void
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mfs_print(vp)
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struct vnode *vp;
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{
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register struct mfsnode *mfsp = VTOMFS(vp);
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printf("tag VT_MFS, pid %d, base %d, size %d\n", mfsp->mfs_pid,
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mfsp->mfs_baseoff, mfsp->mfs_size);
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}
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/*
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* Block device bad operation
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*/
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mfs_badop()
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{
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panic("mfs_badop called\n");
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/* NOTREACHED */
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}
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/*
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* Memory based filesystem initialization.
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*/
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mfs_init()
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{
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}
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