430 lines
11 KiB
C
430 lines
11 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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* $FreeBSD$
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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/bio.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 <sys/sysproto.h>
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#include <sys/mman.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_freeblks __P((struct vop_freeblks_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 *) mfs_freeblks },
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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_copyonwrite_desc, (vop_t *) vop_eopnotsupp },
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{ &vop_unlock_desc, (vop_t *) vop_defaultop },
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{ &vop_getwritemount_desc, (vop_t *) vop_stdgetwritemount },
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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 != VCHR)
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panic("mfs_open not VCHR");
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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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* mfs_freeblks() - hook to allow us to free physical memory.
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*
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* We implement the BIO_DELETE strategy. We can't just madvise()
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* here because we have to do it in the correct order vs other bio
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* requests, so we queue it.
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*
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* Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
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* throw-away on brelse()? XXX
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*/
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static int
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mfs_freeblks(ap)
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struct vop_freeblks_args /* {
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struct vnode *a_vp;
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daddr_t a_addr;
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daddr_t a_length;
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} */ *ap;
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{
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struct buf *bp;
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struct vnode *vp;
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if (!vfinddev(ap->a_vp->v_rdev, VCHR, &vp) || vp->v_usecount == 0)
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panic("mfs_freeblks: bad dev");
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bp = geteblk(ap->a_length);
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bp->b_flags |= B_ASYNC;
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bp->b_iocmd = BIO_DELETE;
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bp->b_dev = ap->a_vp->v_rdev;
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bp->b_blkno = ap->a_addr;
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bp->b_offset = dbtob(ap->a_addr);
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bp->b_bcount = ap->a_length;
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BUF_KERNPROC(bp);
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VOP_STRATEGY(vp, bp);
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return(0);
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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 bio *a_bp;
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} */ *ap;
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{
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register struct buf *bp = (struct buf *)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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int s;
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if (!vfinddev(bp->b_dev, VCHR, &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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/*
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* splbio required for queueing/dequeueing, in case of forwarded
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* BPs from bio interrupts (?). It may not be necessary.
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*/
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s = splbio();
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if (mfsp->mfs_pid == 0) {
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/*
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* mini-root. Note: BIO_DELETE not supported at the moment,
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* I'm not sure what kind of dataspace b_data is in.
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*/
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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_iocmd == BIO_DELETE)
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;
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if (bp->b_iocmd == BIO_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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bufdone(bp);
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} else if (mfsp->mfs_pid == p->p_pid) {
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/*
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* VOP to self
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*/
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splx(s);
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mfs_doio(bp, mfsp);
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s = splbio();
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} else {
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/*
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* VOP from some other process, queue to MFS process and
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* wake it up.
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*/
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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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splx(s);
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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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* Read and Write are handled with a simple copyin and copyout.
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*
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* We also partially support VOP_FREEBLKS() via BIO_DELETE. We can't implement
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* completely -- for example, on fragments or inode metadata, but we can
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* implement it for page-aligned requests.
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*/
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void
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mfs_doio(bp, mfsp)
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register struct buf *bp;
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struct mfsnode *mfsp;
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{
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caddr_t base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
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if (bp->b_iocmd == BIO_DELETE) {
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/*
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* Implement BIO_DELETE, which allows the filesystem to tell
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* a block device when blocks are no longer needed (like when
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* a file is deleted). We use the hook to MADV_FREE the VM.
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* This makes an MFS filesystem work as well or better then
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* a sun-style swap-mounted filesystem.
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*/
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int bytes = bp->b_bcount;
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if ((vm_offset_t)base & PAGE_MASK) {
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int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
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bytes -= n;
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base += n;
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}
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if (bytes > 0) {
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struct madvise_args uap;
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bytes &= ~PAGE_MASK;
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if (bytes != 0) {
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bzero(&uap, sizeof(uap));
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uap.addr = base;
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uap.len = bytes;
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uap.behav = MADV_FREE;
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madvise(curproc, &uap);
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}
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}
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bp->b_error = 0;
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} else if (bp->b_iocmd == BIO_READ) {
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/*
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* Read data from our 'memory' disk
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*/
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bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
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} else {
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/*
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* Write data to our 'memory' disk
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*/
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bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
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}
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if (bp->b_error)
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bp->b_ioflags |= BIO_ERROR;
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bufdone(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)) != NULL) {
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bufq_remove(&mfsp->buf_queue, bp);
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mfs_doio(bp, mfsp);
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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)) != 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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