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909 lines
21 KiB
C
909 lines
21 KiB
C
/*
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* Copyright (c) 1990 University of Utah.
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 1993, 1994 John S. Dyson
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* Copyright (c) 1995, David Greenman
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*
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* This code is derived from software contributed to Berkeley by
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* the Systems Programming Group of the University of Utah Computer
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* Science Department.
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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: @(#)vnode_pager.c 7.5 (Berkeley) 4/20/91
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* $Id: vnode_pager.c,v 1.81 1998/01/31 11:56:53 dyson Exp $
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*/
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/*
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* Page to/from files (vnodes).
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*/
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/*
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* TODO:
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* Implement VOP_GETPAGES/PUTPAGES interface for filesystems. Will
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* greatly re-simplify the vnode_pager.
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*/
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#include "opt_diagnostic.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/proc.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/buf.h>
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#include <sys/vmmeter.h>
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#include <vm/vm.h>
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#include <vm/vm_prot.h>
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#include <vm/vm_object.h>
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#include <vm/vm_page.h>
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#include <vm/vm_pager.h>
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#include <vm/vm_map.h>
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#include <vm/vnode_pager.h>
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#include <vm/vm_extern.h>
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static vm_offset_t vnode_pager_addr __P((struct vnode *vp, vm_ooffset_t address,
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int *run));
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static void vnode_pager_iodone __P((struct buf *bp));
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static int vnode_pager_input_smlfs __P((vm_object_t object, vm_page_t m));
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static int vnode_pager_input_old __P((vm_object_t object, vm_page_t m));
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static void vnode_pager_dealloc __P((vm_object_t));
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static int vnode_pager_getpages __P((vm_object_t, vm_page_t *, int, int));
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static int vnode_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *));
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static boolean_t vnode_pager_haspage __P((vm_object_t, vm_pindex_t, int *, int *));
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struct pagerops vnodepagerops = {
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NULL,
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vnode_pager_alloc,
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vnode_pager_dealloc,
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vnode_pager_getpages,
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vnode_pager_putpages,
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vnode_pager_haspage,
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NULL
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};
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static int vnode_pager_leaf_getpages __P((vm_object_t object, vm_page_t *m,
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int count, int reqpage));
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static int vnode_pager_leaf_putpages __P((vm_object_t object, vm_page_t *m,
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int count, boolean_t sync,
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int *rtvals));
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/*
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* Allocate (or lookup) pager for a vnode.
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* Handle is a vnode pointer.
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*/
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vm_object_t
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vnode_pager_alloc(void *handle, vm_size_t size, vm_prot_t prot,
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vm_ooffset_t offset)
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{
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vm_object_t object;
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struct vnode *vp;
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/*
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* Pageout to vnode, no can do yet.
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*/
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if (handle == NULL)
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return (NULL);
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vp = (struct vnode *) handle;
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/*
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* Prevent race condition when allocating the object. This
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* can happen with NFS vnodes since the nfsnode isn't locked.
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*/
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while (vp->v_flag & VOLOCK) {
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vp->v_flag |= VOWANT;
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tsleep(vp, PVM, "vnpobj", 0);
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}
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vp->v_flag |= VOLOCK;
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/*
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* If the object is being terminated, wait for it to
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* go away.
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*/
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while (((object = vp->v_object) != NULL) &&
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(object->flags & OBJ_DEAD)) {
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tsleep(object, PVM, "vadead", 0);
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}
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if (vp->v_usecount == 0)
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panic("vnode_pager_alloc: no vnode reference");
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if (object == NULL) {
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/*
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* And an object of the appropriate size
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*/
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object = vm_object_allocate(OBJT_VNODE, size);
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object->flags = 0;
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object->un_pager.vnp.vnp_size = (vm_ooffset_t) size * PAGE_SIZE;
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object->handle = handle;
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vp->v_object = object;
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vp->v_usecount++;
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} else {
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object->ref_count++;
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vp->v_usecount++;
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}
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vp->v_flag &= ~VOLOCK;
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if (vp->v_flag & VOWANT) {
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vp->v_flag &= ~VOWANT;
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wakeup(vp);
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}
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return (object);
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}
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static void
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vnode_pager_dealloc(object)
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vm_object_t object;
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{
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register struct vnode *vp = object->handle;
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if (vp == NULL)
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panic("vnode_pager_dealloc: pager already dealloced");
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if (object->paging_in_progress) {
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int s = splbio();
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while (object->paging_in_progress) {
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object->flags |= OBJ_PIPWNT;
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tsleep(object, PVM, "vnpdea", 0);
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}
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splx(s);
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}
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object->handle = NULL;
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object->type = OBJT_DEFAULT;
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vp->v_object = NULL;
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vp->v_flag &= ~(VTEXT|VOBJBUF);
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}
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static boolean_t
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vnode_pager_haspage(object, pindex, before, after)
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vm_object_t object;
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vm_pindex_t pindex;
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int *before;
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int *after;
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{
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struct vnode *vp = object->handle;
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daddr_t bn;
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int err;
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daddr_t reqblock;
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int poff;
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int bsize;
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int pagesperblock, blocksperpage;
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if ((vp == NULL) || (vp->v_flag & VDOOMED))
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return FALSE;
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/*
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* If filesystem no longer mounted or offset beyond end of file we do
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* not have the page.
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*/
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if ((vp->v_mount == NULL) ||
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(IDX_TO_OFF(pindex) >= object->un_pager.vnp.vnp_size))
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return FALSE;
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bsize = vp->v_mount->mnt_stat.f_iosize;
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pagesperblock = bsize / PAGE_SIZE;
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blocksperpage = 0;
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if (pagesperblock > 0) {
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reqblock = pindex / pagesperblock;
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} else {
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blocksperpage = (PAGE_SIZE / bsize);
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reqblock = pindex * blocksperpage;
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}
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err = VOP_BMAP(vp, reqblock, (struct vnode **) 0, &bn,
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after, before);
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if (err)
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return TRUE;
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if ( bn == -1)
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return FALSE;
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if (pagesperblock > 0) {
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poff = pindex - (reqblock * pagesperblock);
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if (before) {
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*before *= pagesperblock;
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*before += poff;
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}
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if (after) {
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int numafter;
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*after *= pagesperblock;
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numafter = pagesperblock - (poff + 1);
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if (IDX_TO_OFF(pindex + numafter) > object->un_pager.vnp.vnp_size) {
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numafter = OFF_TO_IDX((object->un_pager.vnp.vnp_size - IDX_TO_OFF(pindex)));
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}
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*after += numafter;
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}
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} else {
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if (before) {
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*before /= blocksperpage;
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}
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if (after) {
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*after /= blocksperpage;
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}
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}
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return TRUE;
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}
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/*
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* Lets the VM system know about a change in size for a file.
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* We adjust our own internal size and flush any cached pages in
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* the associated object that are affected by the size change.
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*
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* Note: this routine may be invoked as a result of a pager put
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* operation (possibly at object termination time), so we must be careful.
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*/
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void
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vnode_pager_setsize(vp, nsize)
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struct vnode *vp;
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vm_ooffset_t nsize;
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{
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vm_object_t object = vp->v_object;
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if (object == NULL)
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return;
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/*
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* Hasn't changed size
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*/
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if (nsize == object->un_pager.vnp.vnp_size)
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return;
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/*
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* File has shrunk. Toss any cached pages beyond the new EOF.
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*/
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if (nsize < object->un_pager.vnp.vnp_size) {
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vm_ooffset_t nsizerounded;
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nsizerounded = IDX_TO_OFF(OFF_TO_IDX(nsize + PAGE_MASK));
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if (nsizerounded < object->un_pager.vnp.vnp_size) {
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vm_pindex_t st, end;
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st = OFF_TO_IDX(nsize + PAGE_MASK);
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end = OFF_TO_IDX(object->un_pager.vnp.vnp_size);
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vm_freeze_copyopts(object, OFF_TO_IDX(nsize), object->size);
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vm_object_page_remove(object, st, end, FALSE);
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}
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/*
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* this gets rid of garbage at the end of a page that is now
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* only partially backed by the vnode...
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*/
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if (nsize & PAGE_MASK) {
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vm_offset_t kva;
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vm_page_t m;
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m = vm_page_lookup(object, OFF_TO_IDX(nsize));
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if (m) {
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kva = vm_pager_map_page(m);
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bzero((caddr_t) kva + (nsize & PAGE_MASK),
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(int) (round_page(nsize) - nsize));
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vm_pager_unmap_page(kva);
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}
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}
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}
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object->un_pager.vnp.vnp_size = nsize;
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object->size = OFF_TO_IDX(nsize + PAGE_MASK);
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}
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void
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vnode_pager_freepage(m)
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vm_page_t m;
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{
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vm_page_free(m);
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}
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/*
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* calculate the linear (byte) disk address of specified virtual
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* file address
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*/
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static vm_offset_t
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vnode_pager_addr(vp, address, run)
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struct vnode *vp;
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vm_ooffset_t address;
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int *run;
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{
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int rtaddress;
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int bsize;
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daddr_t block;
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struct vnode *rtvp;
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int err;
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daddr_t vblock;
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int voffset;
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if ((int) address < 0)
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return -1;
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if (vp->v_mount == NULL)
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return -1;
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bsize = vp->v_mount->mnt_stat.f_iosize;
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vblock = address / bsize;
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voffset = address % bsize;
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err = VOP_BMAP(vp, vblock, &rtvp, &block, run, NULL);
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if (err || (block == -1))
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rtaddress = -1;
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else {
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rtaddress = block + voffset / DEV_BSIZE;
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if( run) {
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*run += 1;
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*run *= bsize/PAGE_SIZE;
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*run -= voffset/PAGE_SIZE;
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}
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}
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return rtaddress;
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}
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/*
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* interrupt routine for I/O completion
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*/
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static void
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vnode_pager_iodone(bp)
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struct buf *bp;
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{
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bp->b_flags |= B_DONE;
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wakeup(bp);
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}
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/*
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* small block file system vnode pager input
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*/
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static int
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vnode_pager_input_smlfs(object, m)
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vm_object_t object;
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vm_page_t m;
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{
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int i;
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int s;
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struct vnode *dp, *vp;
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struct buf *bp;
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vm_offset_t kva;
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int fileaddr;
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vm_offset_t bsize;
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int error = 0;
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vp = object->handle;
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if (vp->v_mount == NULL)
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return VM_PAGER_BAD;
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bsize = vp->v_mount->mnt_stat.f_iosize;
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VOP_BMAP(vp, 0, &dp, 0, NULL, NULL);
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kva = vm_pager_map_page(m);
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for (i = 0; i < PAGE_SIZE / bsize; i++) {
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if ((vm_page_bits(IDX_TO_OFF(m->pindex) + i * bsize, bsize) & m->valid))
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continue;
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fileaddr = vnode_pager_addr(vp,
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IDX_TO_OFF(m->pindex) + i * bsize, (int *)0);
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if (fileaddr != -1) {
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bp = getpbuf();
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/* build a minimal buffer header */
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bp->b_flags = B_BUSY | B_READ | B_CALL;
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bp->b_iodone = vnode_pager_iodone;
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bp->b_proc = curproc;
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bp->b_rcred = bp->b_wcred = bp->b_proc->p_ucred;
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if (bp->b_rcred != NOCRED)
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crhold(bp->b_rcred);
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if (bp->b_wcred != NOCRED)
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crhold(bp->b_wcred);
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bp->b_data = (caddr_t) kva + i * bsize;
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bp->b_blkno = fileaddr;
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pbgetvp(dp, bp);
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bp->b_bcount = bsize;
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bp->b_bufsize = bsize;
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/* do the input */
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VOP_STRATEGY(bp);
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/* we definitely need to be at splbio here */
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s = splbio();
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while ((bp->b_flags & B_DONE) == 0) {
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tsleep(bp, PVM, "vnsrd", 0);
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}
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splx(s);
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if ((bp->b_flags & B_ERROR) != 0)
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error = EIO;
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/*
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* free the buffer header back to the swap buffer pool
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*/
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relpbuf(bp);
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if (error)
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break;
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vm_page_set_validclean(m, (i * bsize) & PAGE_MASK, bsize);
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} else {
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vm_page_set_validclean(m, (i * bsize) & PAGE_MASK, bsize);
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bzero((caddr_t) kva + i * bsize, bsize);
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}
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}
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vm_pager_unmap_page(kva);
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pmap_clear_modify(VM_PAGE_TO_PHYS(m));
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m->flags &= ~PG_ZERO;
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if (error) {
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return VM_PAGER_ERROR;
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}
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return VM_PAGER_OK;
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}
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/*
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* old style vnode pager output routine
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*/
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static int
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vnode_pager_input_old(object, m)
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vm_object_t object;
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vm_page_t m;
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{
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struct uio auio;
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struct iovec aiov;
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int error;
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int size;
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vm_offset_t kva;
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error = 0;
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/*
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* Return failure if beyond current EOF
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*/
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if (IDX_TO_OFF(m->pindex) >= object->un_pager.vnp.vnp_size) {
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return VM_PAGER_BAD;
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} else {
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size = PAGE_SIZE;
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if (IDX_TO_OFF(m->pindex) + size > object->un_pager.vnp.vnp_size)
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size = object->un_pager.vnp.vnp_size - IDX_TO_OFF(m->pindex);
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/*
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* Allocate a kernel virtual address and initialize so that
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* we can use VOP_READ/WRITE routines.
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*/
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kva = vm_pager_map_page(m);
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aiov.iov_base = (caddr_t) kva;
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aiov.iov_len = size;
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auio.uio_iov = &aiov;
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auio.uio_iovcnt = 1;
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auio.uio_offset = IDX_TO_OFF(m->pindex);
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auio.uio_segflg = UIO_SYSSPACE;
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auio.uio_rw = UIO_READ;
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auio.uio_resid = size;
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auio.uio_procp = (struct proc *) 0;
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error = VOP_READ(object->handle, &auio, 0, curproc->p_ucred);
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if (!error) {
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register int count = size - auio.uio_resid;
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if (count == 0)
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error = EINVAL;
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else if (count != PAGE_SIZE)
|
|
bzero((caddr_t) kva + count, PAGE_SIZE - count);
|
|
}
|
|
vm_pager_unmap_page(kva);
|
|
}
|
|
pmap_clear_modify(VM_PAGE_TO_PHYS(m));
|
|
m->dirty = 0;
|
|
m->flags &= ~PG_ZERO;
|
|
return error ? VM_PAGER_ERROR : VM_PAGER_OK;
|
|
}
|
|
|
|
/*
|
|
* generic vnode pager input routine
|
|
*/
|
|
|
|
static int
|
|
vnode_pager_getpages(object, m, count, reqpage)
|
|
vm_object_t object;
|
|
vm_page_t *m;
|
|
int count;
|
|
int reqpage;
|
|
{
|
|
int rtval;
|
|
struct vnode *vp;
|
|
|
|
vp = object->handle;
|
|
rtval = VOP_GETPAGES(vp, m, count*PAGE_SIZE, reqpage, 0);
|
|
if (rtval == EOPNOTSUPP)
|
|
return vnode_pager_leaf_getpages(object, m, count, reqpage);
|
|
else
|
|
return rtval;
|
|
}
|
|
|
|
static int
|
|
vnode_pager_leaf_getpages(object, m, count, reqpage)
|
|
vm_object_t object;
|
|
vm_page_t *m;
|
|
int count;
|
|
int reqpage;
|
|
{
|
|
vm_offset_t kva;
|
|
off_t foff;
|
|
int i, size, bsize, first, firstaddr;
|
|
struct vnode *dp, *vp;
|
|
int runpg;
|
|
int runend;
|
|
struct buf *bp;
|
|
int s;
|
|
int error = 0;
|
|
|
|
vp = object->handle;
|
|
if (vp->v_mount == NULL)
|
|
return VM_PAGER_BAD;
|
|
|
|
bsize = vp->v_mount->mnt_stat.f_iosize;
|
|
|
|
/* get the UNDERLYING device for the file with VOP_BMAP() */
|
|
|
|
/*
|
|
* originally, we did not check for an error return value -- assuming
|
|
* an fs always has a bmap entry point -- that assumption is wrong!!!
|
|
*/
|
|
foff = IDX_TO_OFF(m[reqpage]->pindex);
|
|
|
|
/*
|
|
* if we can't bmap, use old VOP code
|
|
*/
|
|
if (VOP_BMAP(vp, 0, &dp, 0, NULL, NULL)) {
|
|
for (i = 0; i < count; i++) {
|
|
if (i != reqpage) {
|
|
vnode_pager_freepage(m[i]);
|
|
}
|
|
}
|
|
cnt.v_vnodein++;
|
|
cnt.v_vnodepgsin++;
|
|
return vnode_pager_input_old(object, m[reqpage]);
|
|
|
|
/*
|
|
* if the blocksize is smaller than a page size, then use
|
|
* special small filesystem code. NFS sometimes has a small
|
|
* blocksize, but it can handle large reads itself.
|
|
*/
|
|
} else if ((PAGE_SIZE / bsize) > 1 &&
|
|
(vp->v_mount->mnt_stat.f_type != MOUNT_NFS)) {
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (i != reqpage) {
|
|
vnode_pager_freepage(m[i]);
|
|
}
|
|
}
|
|
cnt.v_vnodein++;
|
|
cnt.v_vnodepgsin++;
|
|
return vnode_pager_input_smlfs(object, m[reqpage]);
|
|
}
|
|
/*
|
|
* if ANY DEV_BSIZE blocks are valid on a large filesystem block
|
|
* then, the entire page is valid --
|
|
* XXX no it isn't
|
|
*/
|
|
|
|
if (m[reqpage]->valid != VM_PAGE_BITS_ALL)
|
|
m[reqpage]->valid = 0;
|
|
|
|
if (m[reqpage]->valid) {
|
|
m[reqpage]->valid = VM_PAGE_BITS_ALL;
|
|
for (i = 0; i < count; i++) {
|
|
if (i != reqpage)
|
|
vnode_pager_freepage(m[i]);
|
|
}
|
|
return VM_PAGER_OK;
|
|
}
|
|
|
|
/*
|
|
* here on direct device I/O
|
|
*/
|
|
|
|
firstaddr = -1;
|
|
/*
|
|
* calculate the run that includes the required page
|
|
*/
|
|
for(first = 0, i = 0; i < count; i = runend) {
|
|
firstaddr = vnode_pager_addr(vp,
|
|
IDX_TO_OFF(m[i]->pindex), &runpg);
|
|
if (firstaddr == -1) {
|
|
if (i == reqpage && foff < object->un_pager.vnp.vnp_size) {
|
|
panic("vnode_pager_getpages: unexpected missing page: firstaddr: %d, foff: %ld, vnp_size: %d",
|
|
firstaddr, foff, object->un_pager.vnp.vnp_size);
|
|
}
|
|
vnode_pager_freepage(m[i]);
|
|
runend = i + 1;
|
|
first = runend;
|
|
continue;
|
|
}
|
|
runend = i + runpg;
|
|
if (runend <= reqpage) {
|
|
int j;
|
|
for (j = i; j < runend; j++) {
|
|
vnode_pager_freepage(m[j]);
|
|
}
|
|
} else {
|
|
if (runpg < (count - first)) {
|
|
for (i = first + runpg; i < count; i++)
|
|
vnode_pager_freepage(m[i]);
|
|
count = first + runpg;
|
|
}
|
|
break;
|
|
}
|
|
first = runend;
|
|
}
|
|
|
|
/*
|
|
* the first and last page have been calculated now, move input pages
|
|
* to be zero based...
|
|
*/
|
|
if (first != 0) {
|
|
for (i = first; i < count; i++) {
|
|
m[i - first] = m[i];
|
|
}
|
|
count -= first;
|
|
reqpage -= first;
|
|
}
|
|
|
|
/*
|
|
* calculate the file virtual address for the transfer
|
|
*/
|
|
foff = IDX_TO_OFF(m[0]->pindex);
|
|
|
|
/*
|
|
* calculate the size of the transfer
|
|
*/
|
|
size = count * PAGE_SIZE;
|
|
if ((foff + size) > object->un_pager.vnp.vnp_size)
|
|
size = object->un_pager.vnp.vnp_size - foff;
|
|
|
|
/*
|
|
* round up physical size for real devices
|
|
*/
|
|
if (dp->v_type == VBLK || dp->v_type == VCHR)
|
|
size = (size + DEV_BSIZE - 1) & ~(DEV_BSIZE - 1);
|
|
|
|
bp = getpbuf();
|
|
kva = (vm_offset_t) bp->b_data;
|
|
|
|
/*
|
|
* and map the pages to be read into the kva
|
|
*/
|
|
pmap_qenter(kva, m, count);
|
|
|
|
/* build a minimal buffer header */
|
|
bp->b_flags = B_BUSY | B_READ | B_CALL;
|
|
bp->b_iodone = vnode_pager_iodone;
|
|
/* B_PHYS is not set, but it is nice to fill this in */
|
|
bp->b_proc = curproc;
|
|
bp->b_rcred = bp->b_wcred = bp->b_proc->p_ucred;
|
|
if (bp->b_rcred != NOCRED)
|
|
crhold(bp->b_rcred);
|
|
if (bp->b_wcred != NOCRED)
|
|
crhold(bp->b_wcred);
|
|
bp->b_blkno = firstaddr;
|
|
pbgetvp(dp, bp);
|
|
bp->b_bcount = size;
|
|
bp->b_bufsize = size;
|
|
|
|
cnt.v_vnodein++;
|
|
cnt.v_vnodepgsin += count;
|
|
|
|
/* do the input */
|
|
VOP_STRATEGY(bp);
|
|
|
|
s = splbio();
|
|
/* we definitely need to be at splbio here */
|
|
|
|
while ((bp->b_flags & B_DONE) == 0) {
|
|
tsleep(bp, PVM, "vnread", 0);
|
|
}
|
|
splx(s);
|
|
if ((bp->b_flags & B_ERROR) != 0)
|
|
error = EIO;
|
|
|
|
if (!error) {
|
|
if (size != count * PAGE_SIZE)
|
|
bzero((caddr_t) kva + size, PAGE_SIZE * count - size);
|
|
}
|
|
pmap_qremove(kva, count);
|
|
|
|
/*
|
|
* free the buffer header back to the swap buffer pool
|
|
*/
|
|
relpbuf(bp);
|
|
|
|
for (i = 0; i < count; i++) {
|
|
pmap_clear_modify(VM_PAGE_TO_PHYS(m[i]));
|
|
m[i]->dirty = 0;
|
|
m[i]->valid = VM_PAGE_BITS_ALL;
|
|
m[i]->flags &= ~PG_ZERO;
|
|
if (i != reqpage) {
|
|
|
|
/*
|
|
* whether or not to leave the page activated is up in
|
|
* the air, but we should put the page on a page queue
|
|
* somewhere. (it already is in the object). Result:
|
|
* It appears that emperical results show that
|
|
* deactivating pages is best.
|
|
*/
|
|
|
|
/*
|
|
* just in case someone was asking for this page we
|
|
* now tell them that it is ok to use
|
|
*/
|
|
if (!error) {
|
|
vm_page_deactivate(m[i]);
|
|
PAGE_WAKEUP(m[i]);
|
|
} else {
|
|
vnode_pager_freepage(m[i]);
|
|
}
|
|
}
|
|
}
|
|
if (error) {
|
|
printf("vnode_pager_getpages: I/O read error\n");
|
|
}
|
|
return (error ? VM_PAGER_ERROR : VM_PAGER_OK);
|
|
}
|
|
|
|
static int
|
|
vnode_pager_putpages(object, m, count, sync, rtvals)
|
|
vm_object_t object;
|
|
vm_page_t *m;
|
|
int count;
|
|
boolean_t sync;
|
|
int *rtvals;
|
|
{
|
|
int rtval;
|
|
struct vnode *vp;
|
|
|
|
vp = object->handle;
|
|
rtval = VOP_PUTPAGES(vp, m, count*PAGE_SIZE, sync, rtvals, 0);
|
|
if (rtval == EOPNOTSUPP)
|
|
return vnode_pager_leaf_putpages(object, m, count, sync, rtvals);
|
|
else
|
|
return rtval;
|
|
}
|
|
|
|
/*
|
|
* generic vnode pager output routine
|
|
*/
|
|
static int
|
|
vnode_pager_leaf_putpages(object, m, count, sync, rtvals)
|
|
vm_object_t object;
|
|
vm_page_t *m;
|
|
int count;
|
|
boolean_t sync;
|
|
int *rtvals;
|
|
{
|
|
int i;
|
|
|
|
struct vnode *vp;
|
|
int maxsize, ncount;
|
|
vm_ooffset_t poffset;
|
|
struct uio auio;
|
|
struct iovec aiov;
|
|
int error;
|
|
|
|
vp = object->handle;;
|
|
for (i = 0; i < count; i++)
|
|
rtvals[i] = VM_PAGER_AGAIN;
|
|
|
|
if ((int) m[0]->pindex < 0) {
|
|
printf("vnode_pager_putpages: attempt to write meta-data!!! -- 0x%x(%x)\n", m[0]->pindex, m[0]->dirty);
|
|
rtvals[0] = VM_PAGER_BAD;
|
|
return VM_PAGER_BAD;
|
|
}
|
|
|
|
maxsize = count * PAGE_SIZE;
|
|
ncount = count;
|
|
|
|
poffset = IDX_TO_OFF(m[0]->pindex);
|
|
if (maxsize + poffset > object->un_pager.vnp.vnp_size) {
|
|
if (object->un_pager.vnp.vnp_size > poffset)
|
|
maxsize = object->un_pager.vnp.vnp_size - poffset;
|
|
else
|
|
maxsize = 0;
|
|
ncount = btoc(maxsize);
|
|
if (ncount < count) {
|
|
for (i = ncount; i < count; i++) {
|
|
rtvals[i] = VM_PAGER_BAD;
|
|
}
|
|
#ifdef BOGUS
|
|
if (ncount == 0) {
|
|
printf("vnode_pager_putpages: write past end of file: %d, %lu\n",
|
|
poffset,
|
|
(unsigned long) object->un_pager.vnp.vnp_size);
|
|
return rtvals[0];
|
|
}
|
|
#endif
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < count; i++) {
|
|
m[i]->busy++;
|
|
m[i]->flags &= ~PG_BUSY;
|
|
}
|
|
|
|
aiov.iov_base = (caddr_t) 0;
|
|
aiov.iov_len = maxsize;
|
|
auio.uio_iov = &aiov;
|
|
auio.uio_iovcnt = 1;
|
|
auio.uio_offset = poffset;
|
|
auio.uio_segflg = UIO_NOCOPY;
|
|
auio.uio_rw = UIO_WRITE;
|
|
auio.uio_resid = maxsize;
|
|
auio.uio_procp = (struct proc *) 0;
|
|
error = VOP_WRITE(vp, &auio, IO_VMIO|(sync?IO_SYNC:0), curproc->p_ucred);
|
|
cnt.v_vnodeout++;
|
|
cnt.v_vnodepgsout += ncount;
|
|
|
|
if (error) {
|
|
printf("vnode_pager_putpages: I/O error %d\n", error);
|
|
}
|
|
if (auio.uio_resid) {
|
|
printf("vnode_pager_putpages: residual I/O %d at %ld\n",
|
|
auio.uio_resid, m[0]->pindex);
|
|
}
|
|
for (i = 0; i < count; i++) {
|
|
m[i]->busy--;
|
|
if (i < ncount) {
|
|
rtvals[i] = VM_PAGER_OK;
|
|
}
|
|
if ((m[i]->busy == 0) && (m[i]->flags & PG_WANTED))
|
|
wakeup(m[i]);
|
|
}
|
|
return rtvals[0];
|
|
}
|
|
|
|
struct vnode *
|
|
vnode_pager_lock(object)
|
|
vm_object_t object;
|
|
{
|
|
struct proc *p = curproc; /* XXX */
|
|
|
|
for (; object != NULL; object = object->backing_object) {
|
|
if (object->type != OBJT_VNODE)
|
|
continue;
|
|
if (object->flags & OBJ_DEAD)
|
|
return NULL;
|
|
|
|
while (vget(object->handle,
|
|
LK_NOPAUSE | LK_SHARED | LK_RETRY | LK_CANRECURSE, p)) {
|
|
printf("vnode_pager_lock: retrying\n");
|
|
}
|
|
return object->handle;
|
|
}
|
|
return NULL;
|
|
}
|