336 lines
9.1 KiB
C
336 lines
9.1 KiB
C
/* $NetBSD: mfs_vnops.c,v 1.30 2002/07/19 16:26:01 hannken Exp $ */
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/*
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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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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: mfs_vnops.c,v 1.30 2002/07/19 16:26:01 hannken Exp $");
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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/map.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <miscfs/genfs/genfs.h>
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#include <miscfs/specfs/specdev.h>
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#include <machine/vmparam.h>
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#include <ufs/mfs/mfsnode.h>
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#include <ufs/mfs/mfs_extern.h>
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/*
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* mfs vnode operations.
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*/
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int (**mfs_vnodeop_p) __P((void *));
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const struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
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{ &vop_default_desc, vn_default_error },
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{ &vop_lookup_desc, mfs_lookup }, /* lookup */
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{ &vop_create_desc, mfs_create }, /* create */
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{ &vop_mknod_desc, mfs_mknod }, /* mknod */
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{ &vop_open_desc, mfs_open }, /* open */
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{ &vop_close_desc, mfs_close }, /* close */
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{ &vop_access_desc, mfs_access }, /* access */
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{ &vop_getattr_desc, mfs_getattr }, /* getattr */
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{ &vop_setattr_desc, mfs_setattr }, /* setattr */
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{ &vop_read_desc, mfs_read }, /* read */
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{ &vop_write_desc, mfs_write }, /* write */
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{ &vop_ioctl_desc, mfs_ioctl }, /* ioctl */
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{ &vop_poll_desc, mfs_poll }, /* poll */
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{ &vop_revoke_desc, mfs_revoke }, /* revoke */
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{ &vop_mmap_desc, mfs_mmap }, /* mmap */
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{ &vop_fsync_desc, spec_fsync }, /* fsync */
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{ &vop_seek_desc, mfs_seek }, /* seek */
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{ &vop_remove_desc, mfs_remove }, /* remove */
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{ &vop_link_desc, mfs_link }, /* link */
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{ &vop_rename_desc, mfs_rename }, /* rename */
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{ &vop_mkdir_desc, mfs_mkdir }, /* mkdir */
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{ &vop_rmdir_desc, mfs_rmdir }, /* rmdir */
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{ &vop_symlink_desc, mfs_symlink }, /* symlink */
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{ &vop_readdir_desc, mfs_readdir }, /* readdir */
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{ &vop_readlink_desc, mfs_readlink }, /* readlink */
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{ &vop_abortop_desc, mfs_abortop }, /* abortop */
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{ &vop_inactive_desc, mfs_inactive }, /* inactive */
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{ &vop_reclaim_desc, mfs_reclaim }, /* reclaim */
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{ &vop_lock_desc, mfs_lock }, /* lock */
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{ &vop_unlock_desc, mfs_unlock }, /* unlock */
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{ &vop_bmap_desc, mfs_bmap }, /* bmap */
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{ &vop_strategy_desc, mfs_strategy }, /* strategy */
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{ &vop_print_desc, mfs_print }, /* print */
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{ &vop_islocked_desc, mfs_islocked }, /* islocked */
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{ &vop_pathconf_desc, mfs_pathconf }, /* pathconf */
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{ &vop_advlock_desc, mfs_advlock }, /* advlock */
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{ &vop_blkatoff_desc, mfs_blkatoff }, /* blkatoff */
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{ &vop_valloc_desc, mfs_valloc }, /* valloc */
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{ &vop_vfree_desc, mfs_vfree }, /* vfree */
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{ &vop_truncate_desc, mfs_truncate }, /* truncate */
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{ &vop_update_desc, mfs_update }, /* update */
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{ &vop_bwrite_desc, mfs_bwrite }, /* bwrite */
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{ &vop_putpages_desc, mfs_putpages }, /* putpages */
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{ NULL, NULL }
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};
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const struct vnodeopv_desc mfs_vnodeop_opv_desc =
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{ &mfs_vnodeop_p, mfs_vnodeop_entries };
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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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int
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mfs_open(v)
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void *v;
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{
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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 = v;
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if (ap->a_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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* Pass I/O requests to the memory filesystem process.
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*/
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int
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mfs_strategy(v)
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void *v;
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{
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struct vop_strategy_args /* {
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struct buf *a_bp;
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} */ *ap = v;
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struct buf *bp = ap->a_bp;
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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_proc == NULL) {
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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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memcpy(bp->b_data, base, bp->b_bcount);
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else
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memcpy(base, bp->b_data, bp->b_bcount);
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bp->b_resid = 0;
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biodone(bp);
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} else if (mfsp->mfs_proc == p) {
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mfs_doio(bp, mfsp->mfs_baseoff);
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} else if (doing_shutdown) {
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/*
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* bitbucket I/O during shutdown.
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* Note that reads should *not* happen here, but..
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*/
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if (bp->b_flags & B_READ)
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printf("warning: mfs read during shutdown\n");
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bp->b_resid = 0;
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biodone(bp);
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} else {
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BUFQ_PUT(&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 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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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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else
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bp->b_resid = 0;
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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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int
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mfs_bmap(v)
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void *v;
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{
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struct vop_bmap_args /* {
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struct vnode *a_vp;
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daddr_t a_bn;
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struct vnode **a_vpp;
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daddr_t *a_bnp;
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int *a_runp;
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} */ *ap = v;
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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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int
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mfs_close(v)
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void *v;
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{
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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 = v;
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struct vnode *vp = ap->a_vp;
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struct mfsnode *mfsp = VTOMFS(vp);
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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_GET(&mfsp->mfs_buflist)) != NULL) {
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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)) != 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_PEEK(&mfsp->mfs_buflist) != 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_shutdown = 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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int
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mfs_inactive(v)
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void *v;
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{
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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 = v;
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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_PEEK(&mfsp->mfs_buflist) != NULL)
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panic("mfs_inactive: not inactive (mfs_buflist %p)",
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BUFQ_PEEK(&mfsp->mfs_buflist));
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VOP_UNLOCK(vp, 0);
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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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int
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mfs_reclaim(v)
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void *v;
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{
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struct vop_reclaim_args /* {
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struct vnode *a_vp;
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} */ *ap = v;
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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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int
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mfs_print(v)
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void *v;
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{
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struct vop_print_args /* {
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struct vnode *a_vp;
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} */ *ap = v;
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struct mfsnode *mfsp = VTOMFS(ap->a_vp);
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printf("tag VT_MFS, pid %d, base %p, size %ld\n",
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(mfsp->mfs_proc != NULL) ? mfsp->mfs_proc->p_pid : 0,
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mfsp->mfs_baseoff, mfsp->mfs_size);
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return (0);
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}
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