326 lines
8.4 KiB
C
326 lines
8.4 KiB
C
/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. 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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* @(#)mfs_vnops.c 8.11 (Berkeley) 5/22/95
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* $Id: mfs_vnops.c,v 1.37 1998/07/11 07:46:05 bde Exp $
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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/buf.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <miscfs/specfs/specdev.h>
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#include <ufs/mfs/mfsnode.h>
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#include <ufs/mfs/mfs_extern.h>
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static int mfs_badop __P((struct vop_generic_args *));
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static int mfs_bmap __P((struct vop_bmap_args *));
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static int mfs_close __P((struct vop_close_args *));
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static int mfs_fsync __P((struct vop_fsync_args *));
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static int mfs_inactive __P((struct vop_inactive_args *)); /* XXX */
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static int mfs_open __P((struct vop_open_args *));
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static int mfs_reclaim __P((struct vop_reclaim_args *)); /* XXX */
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static int mfs_print __P((struct vop_print_args *)); /* XXX */
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static int mfs_strategy __P((struct vop_strategy_args *)); /* XXX */
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static int mfs_getpages __P((struct vop_getpages_args *)); /* XXX */
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/*
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* mfs vnode operations.
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*/
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vop_t **mfs_vnodeop_p;
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static struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
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{ &vop_default_desc, (vop_t *) mfs_badop },
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{ &vop_bmap_desc, (vop_t *) mfs_bmap },
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{ &vop_bwrite_desc, (vop_t *) vop_defaultop },
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{ &vop_close_desc, (vop_t *) mfs_close },
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{ &vop_freeblks_desc, (vop_t *) vop_defaultop },
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{ &vop_fsync_desc, (vop_t *) mfs_fsync },
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{ &vop_getpages_desc, (vop_t *) mfs_getpages },
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{ &vop_inactive_desc, (vop_t *) mfs_inactive },
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{ &vop_ioctl_desc, (vop_t *) vop_enotty },
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{ &vop_islocked_desc, (vop_t *) vop_defaultop },
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{ &vop_lock_desc, (vop_t *) vop_defaultop },
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{ &vop_open_desc, (vop_t *) mfs_open },
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{ &vop_print_desc, (vop_t *) mfs_print },
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{ &vop_reclaim_desc, (vop_t *) mfs_reclaim },
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{ &vop_strategy_desc, (vop_t *) mfs_strategy },
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{ &vop_unlock_desc, (vop_t *) vop_defaultop },
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{ NULL, NULL }
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};
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static struct vnodeopv_desc mfs_vnodeop_opv_desc =
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{ &mfs_vnodeop_p, mfs_vnodeop_entries };
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VNODEOP_SET(mfs_vnodeop_opv_desc);
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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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static int
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mfs_open(ap)
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struct vop_open_args /* {
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struct vnode *a_vp;
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int a_mode;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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if (ap->a_vp->v_type != VBLK) {
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panic("mfs_open 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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static int
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mfs_fsync(ap)
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struct vop_fsync_args *ap;
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{
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return (VOCALL(spec_vnodeop_p, VOFFSET(vop_fsync), ap));
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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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static int
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mfs_strategy(ap)
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struct vop_strategy_args /* {
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struct vnode *a_vp;
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struct buf *a_bp;
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} */ *ap;
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{
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register struct buf *bp = ap->a_bp;
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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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/* check for mini-root access */
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if (mfsp->mfs_pid == 0) {
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caddr_t base;
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base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
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if (bp->b_flags & B_READ)
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bcopy(base, bp->b_data, bp->b_bcount);
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else
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bcopy(bp->b_data, base, bp->b_bcount);
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biodone(bp);
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} else 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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bufq_insert_tail(&mfsp->buf_queue, 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 on the HP since buffer has already been mapping into KVA space.
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*/
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void
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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_data, bp->b_bcount);
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else
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bp->b_error = copyout(bp->b_data, 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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static int
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mfs_bmap(ap)
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struct vop_bmap_args /* {
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struct vnode *a_vp;
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ufs_daddr_t a_bn;
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struct vnode **a_vpp;
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ufs_daddr_t *a_bnp;
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int *a_runp;
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} */ *ap;
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{
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if (ap->a_vpp != NULL)
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*ap->a_vpp = ap->a_vp;
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if (ap->a_bnp != NULL)
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*ap->a_bnp = ap->a_bn;
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if (ap->a_runp != NULL)
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*ap->a_runp = 0;
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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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static int
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mfs_close(ap)
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struct vop_close_args /* {
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struct vnode *a_vp;
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int a_fflag;
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struct ucred *a_cred;
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struct proc *a_p;
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} */ *ap;
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{
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register struct vnode *vp = ap->a_vp;
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register struct mfsnode *mfsp = VTOMFS(vp);
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register struct buf *bp;
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int error;
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/*
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* Finish any pending I/O requests.
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*/
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while (bp = bufq_first(&mfsp->buf_queue)) {
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bufq_remove(&mfsp->buf_queue, bp);
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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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if (error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0))
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return (error);
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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 || (bufq_first(&mfsp->buf_queue) != NULL))
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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_active = 0;
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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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static int
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mfs_inactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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struct proc *a_p;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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struct mfsnode *mfsp = VTOMFS(vp);
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if (bufq_first(&mfsp->buf_queue) != NULL)
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panic("mfs_inactive: not inactive (next buffer %p)",
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bufq_first(&mfsp->buf_queue));
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VOP_UNLOCK(vp, 0, ap->a_p);
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return (0);
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}
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/*
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* Reclaim a memory filesystem devvp so that it can be reused.
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*/
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static int
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mfs_reclaim(ap)
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struct vop_reclaim_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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register struct vnode *vp = ap->a_vp;
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FREE(vp->v_data, M_MFSNODE);
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vp->v_data = NULL;
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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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static int
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mfs_print(ap)
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struct vop_print_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
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printf("tag VT_MFS, pid %ld, base %p, size %ld\n",
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(long)mfsp->mfs_pid, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
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return (0);
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}
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/*
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* Block device bad operation
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*/
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static int
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mfs_badop(struct vop_generic_args *ap)
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{
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int i;
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printf("mfs_badop[%s]\n", ap->a_desc->vdesc_name);
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i = vop_defaultop(ap);
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printf("mfs_badop[%s] = %d\n", ap->a_desc->vdesc_name,i);
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return (i);
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}
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static int
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mfs_getpages(ap)
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struct vop_getpages_args *ap;
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{
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return (VOCALL(spec_vnodeop_p, VOFFSET(vop_getpages), ap));
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}
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