vnode_pager.c revision 31853
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1990 University of Utah. 31549Srgrimes * Copyright (c) 1991 The Regents of the University of California. 41549Srgrimes * All rights reserved. 59507Sdg * Copyright (c) 1993, 1994 John S. Dyson 69507Sdg * Copyright (c) 1995, David Greenman 71541Srgrimes * 81541Srgrimes * This code is derived from software contributed to Berkeley by 91541Srgrimes * the Systems Programming Group of the University of Utah Computer 101541Srgrimes * Science Department. 111541Srgrimes * 121541Srgrimes * Redistribution and use in source and binary forms, with or without 131541Srgrimes * modification, are permitted provided that the following conditions 141541Srgrimes * are met: 151541Srgrimes * 1. Redistributions of source code must retain the above copyright 161541Srgrimes * notice, this list of conditions and the following disclaimer. 171541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 181541Srgrimes * notice, this list of conditions and the following disclaimer in the 191541Srgrimes * documentation and/or other materials provided with the distribution. 201541Srgrimes * 3. All advertising materials mentioning features or use of this software 211541Srgrimes * must display the following acknowledgement: 221541Srgrimes * This product includes software developed by the University of 231541Srgrimes * California, Berkeley and its contributors. 241541Srgrimes * 4. Neither the name of the University nor the names of its contributors 251541Srgrimes * may be used to endorse or promote products derived from this software 261541Srgrimes * without specific prior written permission. 271541Srgrimes * 281541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 291541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 301541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 311541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 321541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 331541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 341541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 351541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 361541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 371541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 381541Srgrimes * SUCH DAMAGE. 391541Srgrimes * 401549Srgrimes * from: @(#)vnode_pager.c 7.5 (Berkeley) 4/20/91 4131853Sdyson * $Id: vnode_pager.c,v 1.76 1997/12/02 21:07:20 phk Exp $ 421541Srgrimes */ 431541Srgrimes 441541Srgrimes/* 451541Srgrimes * Page to/from files (vnodes). 461541Srgrimes */ 471541Srgrimes 481549Srgrimes/* 491549Srgrimes * TODO: 509507Sdg * Implement VOP_GETPAGES/PUTPAGES interface for filesystems. Will 517695Sdg * greatly re-simplify the vnode_pager. 521549Srgrimes */ 531549Srgrimes 541541Srgrimes#include <sys/param.h> 551541Srgrimes#include <sys/systm.h> 561541Srgrimes#include <sys/proc.h> 571541Srgrimes#include <sys/vnode.h> 581541Srgrimes#include <sys/mount.h> 599507Sdg#include <sys/buf.h> 6012662Sdg#include <sys/vmmeter.h> 611541Srgrimes 621541Srgrimes#include <vm/vm.h> 6312662Sdg#include <vm/vm_prot.h> 6412662Sdg#include <vm/vm_object.h> 651541Srgrimes#include <vm/vm_page.h> 669507Sdg#include <vm/vm_pager.h> 6731853Sdyson#include <vm/vm_map.h> 681541Srgrimes#include <vm/vnode_pager.h> 6912662Sdg#include <vm/vm_extern.h> 701541Srgrimes 7112820Sphkstatic vm_offset_t vnode_pager_addr __P((struct vnode *vp, vm_ooffset_t address, 7211943Sbde int *run)); 7312820Sphkstatic void vnode_pager_iodone __P((struct buf *bp)); 7412820Sphkstatic int vnode_pager_input_smlfs __P((vm_object_t object, vm_page_t m)); 7512820Sphkstatic int vnode_pager_input_old __P((vm_object_t object, vm_page_t m)); 7612820Sphkstatic void vnode_pager_dealloc __P((vm_object_t)); 7712820Sphkstatic int vnode_pager_getpages __P((vm_object_t, vm_page_t *, int, int)); 7812820Sphkstatic int vnode_pager_putpages __P((vm_object_t, vm_page_t *, int, boolean_t, int *)); 7912820Sphkstatic boolean_t vnode_pager_haspage __P((vm_object_t, vm_pindex_t, int *, int *)); 8011943Sbde 811541Srgrimesstruct pagerops vnodepagerops = { 829507Sdg NULL, 831541Srgrimes vnode_pager_alloc, 841541Srgrimes vnode_pager_dealloc, 859507Sdg vnode_pager_getpages, 869507Sdg vnode_pager_putpages, 879507Sdg vnode_pager_haspage, 889507Sdg NULL 891541Srgrimes}; 901541Srgrimes 9111943Sbdestatic int vnode_pager_leaf_getpages __P((vm_object_t object, vm_page_t *m, 9211943Sbde int count, int reqpage)); 9311943Sbdestatic int vnode_pager_leaf_putpages __P((vm_object_t object, vm_page_t *m, 9411943Sbde int count, boolean_t sync, 9511943Sbde int *rtvals)); 9610556Sdyson 971541Srgrimes/* 981541Srgrimes * Allocate (or lookup) pager for a vnode. 991541Srgrimes * Handle is a vnode pointer. 1001541Srgrimes */ 1019507Sdgvm_object_t 10228751Sbdevnode_pager_alloc(void *handle, vm_size_t size, vm_prot_t prot, 10328751Sbde vm_ooffset_t offset) 1041541Srgrimes{ 1059456Sdg vm_object_t object; 1061541Srgrimes struct vnode *vp; 1071541Srgrimes 1081541Srgrimes /* 1091541Srgrimes * Pageout to vnode, no can do yet. 1101541Srgrimes */ 1111541Srgrimes if (handle == NULL) 1121827Sdg return (NULL); 1131541Srgrimes 1149411Sdg vp = (struct vnode *) handle; 1159411Sdg 1161541Srgrimes /* 1179411Sdg * Prevent race condition when allocating the object. This 1189411Sdg * can happen with NFS vnodes since the nfsnode isn't locked. 1191541Srgrimes */ 1209411Sdg while (vp->v_flag & VOLOCK) { 1219411Sdg vp->v_flag |= VOWANT; 1229411Sdg tsleep(vp, PVM, "vnpobj", 0); 1239411Sdg } 1249411Sdg vp->v_flag |= VOLOCK; 1259411Sdg 1269411Sdg /* 1279411Sdg * If the object is being terminated, wait for it to 1289411Sdg * go away. 1299411Sdg */ 13013490Sdyson while (((object = vp->v_object) != NULL) && 13113490Sdyson (object->flags & OBJ_DEAD)) { 1329356Sdg tsleep(object, PVM, "vadead", 0); 1339507Sdg } 1345455Sdg 1359507Sdg if (object == NULL) { 1361541Srgrimes /* 1371541Srgrimes * And an object of the appropriate size 1381541Srgrimes */ 13912767Sdyson object = vm_object_allocate(OBJT_VNODE, size); 14014693Sdyson if (vp->v_type == VREG) 14114693Sdyson object->flags = OBJ_CANPERSIST; 14214693Sdyson else 14314693Sdyson object->flags = 0; 1441827Sdg 14521987Sdg if (vp->v_usecount == 0) 14621987Sdg panic("vnode_pager_alloc: no vnode reference"); 1471541Srgrimes /* 1489507Sdg * Hold a reference to the vnode and initialize object data. 1491541Srgrimes */ 15017761Sdyson vp->v_usecount++; 15112767Sdyson object->un_pager.vnp.vnp_size = (vm_ooffset_t) size * PAGE_SIZE; 1521549Srgrimes 1539507Sdg object->handle = handle; 1549507Sdg vp->v_object = object; 1551541Srgrimes } else { 1561541Srgrimes /* 1579507Sdg * vm_object_reference() will remove the object from the cache if 1589507Sdg * found and gain a reference to the object. 1591541Srgrimes */ 1609507Sdg vm_object_reference(object); 1611541Srgrimes } 1629411Sdg 1639411Sdg if (vp->v_type == VREG) 1647695Sdg vp->v_flag |= VVMIO; 1659411Sdg 1669411Sdg vp->v_flag &= ~VOLOCK; 1679411Sdg if (vp->v_flag & VOWANT) { 1689411Sdg vp->v_flag &= ~VOWANT; 1699411Sdg wakeup(vp); 1709411Sdg } 1719507Sdg return (object); 1721541Srgrimes} 1731541Srgrimes 17412820Sphkstatic void 1759507Sdgvnode_pager_dealloc(object) 1769507Sdg vm_object_t object; 1771541Srgrimes{ 1789507Sdg register struct vnode *vp = object->handle; 1791541Srgrimes 1809507Sdg if (vp == NULL) 1819507Sdg panic("vnode_pager_dealloc: pager already dealloced"); 1829507Sdg 1839507Sdg if (object->paging_in_progress) { 1845455Sdg int s = splbio(); 1859507Sdg while (object->paging_in_progress) { 1869507Sdg object->flags |= OBJ_PIPWNT; 1879507Sdg tsleep(object, PVM, "vnpdea", 0); 1885455Sdg } 1895455Sdg splx(s); 1901541Srgrimes } 1911541Srgrimes 1929507Sdg object->handle = NULL; 1931827Sdg 1949507Sdg vp->v_object = NULL; 1959507Sdg vp->v_flag &= ~(VTEXT | VVMIO); 1969507Sdg vrele(vp); 1971549Srgrimes} 1981541Srgrimes 19912820Sphkstatic boolean_t 20012767Sdysonvnode_pager_haspage(object, pindex, before, after) 2019507Sdg vm_object_t object; 20212767Sdyson vm_pindex_t pindex; 2039507Sdg int *before; 2049507Sdg int *after; 2051541Srgrimes{ 2069507Sdg struct vnode *vp = object->handle; 2071541Srgrimes daddr_t bn; 20812423Sphk int err; 20910556Sdyson daddr_t reqblock; 21011701Sdyson int poff; 21111701Sdyson int bsize; 21212914Sdyson int pagesperblock, blocksperpage; 2131541Srgrimes 2141541Srgrimes /* 2155455Sdg * If filesystem no longer mounted or offset beyond end of file we do 2165455Sdg * not have the page. 2171541Srgrimes */ 21812767Sdyson if ((vp->v_mount == NULL) || 21912767Sdyson (IDX_TO_OFF(pindex) >= object->un_pager.vnp.vnp_size)) 2204797Sdg return FALSE; 2211541Srgrimes 22211576Sdg bsize = vp->v_mount->mnt_stat.f_iosize; 22310556Sdyson pagesperblock = bsize / PAGE_SIZE; 22412914Sdyson blocksperpage = 0; 22512914Sdyson if (pagesperblock > 0) { 22612914Sdyson reqblock = pindex / pagesperblock; 22712914Sdyson } else { 22812914Sdyson blocksperpage = (PAGE_SIZE / bsize); 22912914Sdyson reqblock = pindex * blocksperpage; 23012914Sdyson } 23110556Sdyson err = VOP_BMAP(vp, reqblock, (struct vnode **) 0, &bn, 23210556Sdyson after, before); 2338876Srgrimes if (err) 2349507Sdg return TRUE; 23510702Sdyson if ( bn == -1) 23610576Sdyson return FALSE; 23712914Sdyson if (pagesperblock > 0) { 23812914Sdyson poff = pindex - (reqblock * pagesperblock); 23912914Sdyson if (before) { 24012914Sdyson *before *= pagesperblock; 24112914Sdyson *before += poff; 24210669Sdyson } 24312914Sdyson if (after) { 24412914Sdyson int numafter; 24512914Sdyson *after *= pagesperblock; 24612914Sdyson numafter = pagesperblock - (poff + 1); 24712914Sdyson if (IDX_TO_OFF(pindex + numafter) > object->un_pager.vnp.vnp_size) { 24812914Sdyson numafter = OFF_TO_IDX((object->un_pager.vnp.vnp_size - IDX_TO_OFF(pindex))); 24912914Sdyson } 25012914Sdyson *after += numafter; 25112914Sdyson } 25212914Sdyson } else { 25312914Sdyson if (before) { 25412914Sdyson *before /= blocksperpage; 25512914Sdyson } 25612914Sdyson 25712914Sdyson if (after) { 25812914Sdyson *after /= blocksperpage; 25912914Sdyson } 26010556Sdyson } 26110576Sdyson return TRUE; 2621541Srgrimes} 2631541Srgrimes 2641541Srgrimes/* 2651541Srgrimes * Lets the VM system know about a change in size for a file. 2669507Sdg * We adjust our own internal size and flush any cached pages in 2671541Srgrimes * the associated object that are affected by the size change. 2681541Srgrimes * 2691541Srgrimes * Note: this routine may be invoked as a result of a pager put 2701541Srgrimes * operation (possibly at object termination time), so we must be careful. 2711541Srgrimes */ 2721541Srgrimesvoid 2731541Srgrimesvnode_pager_setsize(vp, nsize) 2741541Srgrimes struct vnode *vp; 27512767Sdyson vm_ooffset_t nsize; 2761541Srgrimes{ 2779507Sdg vm_object_t object = vp->v_object; 2781541Srgrimes 2799507Sdg if (object == NULL) 2801541Srgrimes return; 2811827Sdg 2821541Srgrimes /* 2831541Srgrimes * Hasn't changed size 2841541Srgrimes */ 2859507Sdg if (nsize == object->un_pager.vnp.vnp_size) 2863374Sdg return; 2871827Sdg 2881541Srgrimes /* 2891827Sdg * File has shrunk. Toss any cached pages beyond the new EOF. 2901541Srgrimes */ 2919507Sdg if (nsize < object->un_pager.vnp.vnp_size) { 29212767Sdyson vm_ooffset_t nsizerounded; 29315583Sphk nsizerounded = IDX_TO_OFF(OFF_TO_IDX(nsize + PAGE_MASK)); 29412767Sdyson if (nsizerounded < object->un_pager.vnp.vnp_size) { 29531853Sdyson vm_pindex_t st, end; 29631853Sdyson st = OFF_TO_IDX(nsize + PAGE_MASK); 29731853Sdyson end = OFF_TO_IDX(object->un_pager.vnp.vnp_size); 29831853Sdyson 29931853Sdyson vm_freeze_copyopts(object, OFF_TO_IDX(nsize), object->size); 30031853Sdyson vm_object_page_remove(object, st, end, FALSE); 3015455Sdg } 3021827Sdg /* 3031827Sdg * this gets rid of garbage at the end of a page that is now 3041827Sdg * only partially backed by the vnode... 3051827Sdg */ 3061827Sdg if (nsize & PAGE_MASK) { 3071827Sdg vm_offset_t kva; 3081827Sdg vm_page_t m; 3091827Sdg 31012767Sdyson m = vm_page_lookup(object, OFF_TO_IDX(nsize)); 3111827Sdg if (m) { 3121827Sdg kva = vm_pager_map_page(m); 3131827Sdg bzero((caddr_t) kva + (nsize & PAGE_MASK), 31412767Sdyson (int) (round_page(nsize) - nsize)); 3151827Sdg vm_pager_unmap_page(kva); 3161827Sdg } 3171827Sdg } 3181541Srgrimes } 31912767Sdyson object->un_pager.vnp.vnp_size = nsize; 32015583Sphk object->size = OFF_TO_IDX(nsize + PAGE_MASK); 3211541Srgrimes} 3221541Srgrimes 3231541Srgrimesvoid 3241541Srgrimesvnode_pager_umount(mp) 3251541Srgrimes register struct mount *mp; 3261541Srgrimes{ 32722521Sdyson struct proc *p = curproc; /* XXX */ 3289507Sdg struct vnode *vp, *nvp; 3291541Srgrimes 3309507Sdgloop: 3319507Sdg for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 3321541Srgrimes /* 3339507Sdg * Vnode can be reclaimed by getnewvnode() while we 3349507Sdg * traverse the list. 3359507Sdg */ 3369507Sdg if (vp->v_mount != mp) 3379507Sdg goto loop; 3389507Sdg 3399507Sdg /* 3401827Sdg * Save the next pointer now since uncaching may terminate the 3419507Sdg * object and render vnode invalid 3421541Srgrimes */ 3439507Sdg nvp = vp->v_mntvnodes.le_next; 3449507Sdg 3459507Sdg if (vp->v_object != NULL) { 34622521Sdyson vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 34722521Sdyson vnode_pager_uncache(vp, p); 34822521Sdyson VOP_UNLOCK(vp, 0, p); 3497162Sdg } 3501541Srgrimes } 3511541Srgrimes} 3521541Srgrimes 3531541Srgrimes/* 3541541Srgrimes * Remove vnode associated object from the object cache. 3557162Sdg * This routine must be called with the vnode locked. 3561541Srgrimes * 3577162Sdg * XXX unlock the vnode. 3587162Sdg * We must do this since uncaching the object may result in its 3597162Sdg * destruction which may initiate paging activity which may necessitate 3607162Sdg * re-locking the vnode. 3611549Srgrimes */ 3629507Sdgvoid 36322521Sdysonvnode_pager_uncache(vp, p) 3649507Sdg struct vnode *vp; 36522521Sdyson struct proc *p; 3661549Srgrimes{ 3679507Sdg vm_object_t object; 3681549Srgrimes 3691549Srgrimes /* 3701549Srgrimes * Not a mapped vnode 3711549Srgrimes */ 3729356Sdg object = vp->v_object; 3735455Sdg if (object == NULL) 3749507Sdg return; 3755455Sdg 3769507Sdg vm_object_reference(object); 37731853Sdyson vm_freeze_copyopts(object, 0, object->size); 37818205Sdyson 37918205Sdyson /* 38018205Sdyson * XXX We really should handle locking on 38118205Sdyson * VBLK devices... 38218205Sdyson */ 38318205Sdyson if (vp->v_type != VBLK) 38422521Sdyson VOP_UNLOCK(vp, 0, p); 3859507Sdg pager_cache(object, FALSE); 38618205Sdyson if (vp->v_type != VBLK) 38722521Sdyson vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p); 3889507Sdg return; 3891549Srgrimes} 3901541Srgrimes 3911541Srgrimes 3921549Srgrimesvoid 3931549Srgrimesvnode_pager_freepage(m) 3941549Srgrimes vm_page_t m; 3951541Srgrimes{ 3961549Srgrimes PAGE_WAKEUP(m); 3971549Srgrimes vm_page_free(m); 3981549Srgrimes} 3991549Srgrimes 4001549Srgrimes/* 4011549Srgrimes * calculate the linear (byte) disk address of specified virtual 4021549Srgrimes * file address 4031549Srgrimes */ 40412820Sphkstatic vm_offset_t 4056151Sdgvnode_pager_addr(vp, address, run) 4061549Srgrimes struct vnode *vp; 40712767Sdyson vm_ooffset_t address; 4086151Sdg int *run; 4091549Srgrimes{ 4105455Sdg int rtaddress; 4115455Sdg int bsize; 41212767Sdyson daddr_t block; 4131549Srgrimes struct vnode *rtvp; 4145455Sdg int err; 41512767Sdyson daddr_t vblock; 41612767Sdyson int voffset; 4171549Srgrimes 4185455Sdg if ((int) address < 0) 4195455Sdg return -1; 4205455Sdg 42111701Sdyson if (vp->v_mount == NULL) 42211701Sdyson return -1; 42311701Sdyson 4241549Srgrimes bsize = vp->v_mount->mnt_stat.f_iosize; 4251549Srgrimes vblock = address / bsize; 4261549Srgrimes voffset = address % bsize; 4271549Srgrimes 42810551Sdyson err = VOP_BMAP(vp, vblock, &rtvp, &block, run, NULL); 4291549Srgrimes 4306151Sdg if (err || (block == -1)) 4311549Srgrimes rtaddress = -1; 4326151Sdg else { 4336626Sdg rtaddress = block + voffset / DEV_BSIZE; 4346151Sdg if( run) { 4356151Sdg *run += 1; 4366151Sdg *run *= bsize/PAGE_SIZE; 4376151Sdg *run -= voffset/PAGE_SIZE; 4386151Sdg } 4396151Sdg } 4401549Srgrimes 4411549Srgrimes return rtaddress; 4421549Srgrimes} 4431549Srgrimes 4441549Srgrimes/* 4451549Srgrimes * interrupt routine for I/O completion 4461549Srgrimes */ 44712820Sphkstatic void 4481549Srgrimesvnode_pager_iodone(bp) 4491549Srgrimes struct buf *bp; 4501549Srgrimes{ 4511549Srgrimes bp->b_flags |= B_DONE; 4529507Sdg wakeup(bp); 4531549Srgrimes} 4541549Srgrimes 4551549Srgrimes/* 4561549Srgrimes * small block file system vnode pager input 4571549Srgrimes */ 45812820Sphkstatic int 4599507Sdgvnode_pager_input_smlfs(object, m) 4609507Sdg vm_object_t object; 4611549Srgrimes vm_page_t m; 4621549Srgrimes{ 4635455Sdg int i; 4645455Sdg int s; 4651549Srgrimes struct vnode *dp, *vp; 4661549Srgrimes struct buf *bp; 4671549Srgrimes vm_offset_t kva; 4685455Sdg int fileaddr; 4691549Srgrimes vm_offset_t bsize; 4705455Sdg int error = 0; 4711549Srgrimes 4729507Sdg vp = object->handle; 47311701Sdyson if (vp->v_mount == NULL) 47411701Sdyson return VM_PAGER_BAD; 47511701Sdyson 4761549Srgrimes bsize = vp->v_mount->mnt_stat.f_iosize; 4771549Srgrimes 4787178Sdg 47910551Sdyson VOP_BMAP(vp, 0, &dp, 0, NULL, NULL); 4801549Srgrimes 4811549Srgrimes kva = vm_pager_map_page(m); 4821549Srgrimes 4831827Sdg for (i = 0; i < PAGE_SIZE / bsize; i++) { 4841827Sdg 48512767Sdyson if ((vm_page_bits(IDX_TO_OFF(m->pindex) + i * bsize, bsize) & m->valid)) 4865455Sdg continue; 4871549Srgrimes 48812767Sdyson fileaddr = vnode_pager_addr(vp, 48912767Sdyson IDX_TO_OFF(m->pindex) + i * bsize, (int *)0); 4901827Sdg if (fileaddr != -1) { 4911549Srgrimes bp = getpbuf(); 4921549Srgrimes 4931827Sdg /* build a minimal buffer header */ 4941549Srgrimes bp->b_flags = B_BUSY | B_READ | B_CALL; 4951549Srgrimes bp->b_iodone = vnode_pager_iodone; 4961549Srgrimes bp->b_proc = curproc; 4971549Srgrimes bp->b_rcred = bp->b_wcred = bp->b_proc->p_ucred; 4981827Sdg if (bp->b_rcred != NOCRED) 4991549Srgrimes crhold(bp->b_rcred); 5001827Sdg if (bp->b_wcred != NOCRED) 5011549Srgrimes crhold(bp->b_wcred); 50231493Sphk bp->b_data = (caddr_t) kva + i * bsize; 5036626Sdg bp->b_blkno = fileaddr; 5045455Sdg pbgetvp(dp, bp); 5051549Srgrimes bp->b_bcount = bsize; 5061549Srgrimes bp->b_bufsize = bsize; 5071827Sdg 5081827Sdg /* do the input */ 5091549Srgrimes VOP_STRATEGY(bp); 5101549Srgrimes 5111827Sdg /* we definitely need to be at splbio here */ 5121549Srgrimes 5131549Srgrimes s = splbio(); 5141549Srgrimes while ((bp->b_flags & B_DONE) == 0) { 5159356Sdg tsleep(bp, PVM, "vnsrd", 0); 5161549Srgrimes } 5171549Srgrimes splx(s); 5181549Srgrimes if ((bp->b_flags & B_ERROR) != 0) 5191549Srgrimes error = EIO; 5201549Srgrimes 5211827Sdg /* 5221827Sdg * free the buffer header back to the swap buffer pool 5231827Sdg */ 5241549Srgrimes relpbuf(bp); 5251827Sdg if (error) 5261549Srgrimes break; 5275455Sdg 52815583Sphk vm_page_set_validclean(m, (i * bsize) & PAGE_MASK, bsize); 5291549Srgrimes } else { 53015583Sphk vm_page_set_validclean(m, (i * bsize) & PAGE_MASK, bsize); 5311549Srgrimes bzero((caddr_t) kva + i * bsize, bsize); 5321549Srgrimes } 5331549Srgrimes } 5341549Srgrimes vm_pager_unmap_page(kva); 53517334Sdyson pmap_clear_modify(VM_PAGE_TO_PHYS(m)); 53610669Sdyson m->flags &= ~PG_ZERO; 5371827Sdg if (error) { 5384207Sdg return VM_PAGER_ERROR; 5391549Srgrimes } 5401549Srgrimes return VM_PAGER_OK; 5411549Srgrimes 5421549Srgrimes} 5431549Srgrimes 5441549Srgrimes 5451549Srgrimes/* 5461549Srgrimes * old style vnode pager output routine 5471549Srgrimes */ 54812820Sphkstatic int 5499507Sdgvnode_pager_input_old(object, m) 5509507Sdg vm_object_t object; 5511549Srgrimes vm_page_t m; 5521549Srgrimes{ 5531541Srgrimes struct uio auio; 5541541Srgrimes struct iovec aiov; 5555455Sdg int error; 5565455Sdg int size; 5571549Srgrimes vm_offset_t kva; 5581549Srgrimes 5591549Srgrimes error = 0; 5601827Sdg 5611549Srgrimes /* 5621549Srgrimes * Return failure if beyond current EOF 5631549Srgrimes */ 56412767Sdyson if (IDX_TO_OFF(m->pindex) >= object->un_pager.vnp.vnp_size) { 5651549Srgrimes return VM_PAGER_BAD; 5661549Srgrimes } else { 5671549Srgrimes size = PAGE_SIZE; 56812767Sdyson if (IDX_TO_OFF(m->pindex) + size > object->un_pager.vnp.vnp_size) 56912767Sdyson size = object->un_pager.vnp.vnp_size - IDX_TO_OFF(m->pindex); 5707178Sdg 5715455Sdg /* 5725455Sdg * Allocate a kernel virtual address and initialize so that 5735455Sdg * we can use VOP_READ/WRITE routines. 5745455Sdg */ 5751549Srgrimes kva = vm_pager_map_page(m); 5767178Sdg 5771827Sdg aiov.iov_base = (caddr_t) kva; 5781549Srgrimes aiov.iov_len = size; 5791549Srgrimes auio.uio_iov = &aiov; 5801549Srgrimes auio.uio_iovcnt = 1; 58112767Sdyson auio.uio_offset = IDX_TO_OFF(m->pindex); 5821549Srgrimes auio.uio_segflg = UIO_SYSSPACE; 5831549Srgrimes auio.uio_rw = UIO_READ; 5841549Srgrimes auio.uio_resid = size; 5851827Sdg auio.uio_procp = (struct proc *) 0; 5861549Srgrimes 5879507Sdg error = VOP_READ(object->handle, &auio, 0, curproc->p_ucred); 5881549Srgrimes if (!error) { 5891549Srgrimes register int count = size - auio.uio_resid; 5901549Srgrimes 5911549Srgrimes if (count == 0) 5921549Srgrimes error = EINVAL; 5931549Srgrimes else if (count != PAGE_SIZE) 5941827Sdg bzero((caddr_t) kva + count, PAGE_SIZE - count); 5951549Srgrimes } 5961549Srgrimes vm_pager_unmap_page(kva); 5971549Srgrimes } 59817334Sdyson pmap_clear_modify(VM_PAGE_TO_PHYS(m)); 5995455Sdg m->dirty = 0; 60010669Sdyson m->flags &= ~PG_ZERO; 6014207Sdg return error ? VM_PAGER_ERROR : VM_PAGER_OK; 6021549Srgrimes} 6031549Srgrimes 6041549Srgrimes/* 6051549Srgrimes * generic vnode pager input routine 6061549Srgrimes */ 60710556Sdyson 60812820Sphkstatic int 6099507Sdgvnode_pager_getpages(object, m, count, reqpage) 6109507Sdg vm_object_t object; 6111549Srgrimes vm_page_t *m; 6129507Sdg int count; 6139507Sdg int reqpage; 6141549Srgrimes{ 61510556Sdyson int rtval; 61610556Sdyson struct vnode *vp; 61718973Sdyson if (object->flags & OBJ_VNODE_GONE) 61818973Sdyson return VM_PAGER_ERROR; 61910556Sdyson vp = object->handle; 62011701Sdyson rtval = VOP_GETPAGES(vp, m, count*PAGE_SIZE, reqpage, 0); 62110556Sdyson if (rtval == EOPNOTSUPP) 62211943Sbde return vnode_pager_leaf_getpages(object, m, count, reqpage); 62310556Sdyson else 62410556Sdyson return rtval; 62510556Sdyson} 62610556Sdyson 62710556Sdysonstatic int 62810556Sdysonvnode_pager_leaf_getpages(object, m, count, reqpage) 62910556Sdyson vm_object_t object; 63010556Sdyson vm_page_t *m; 63110556Sdyson int count; 63210556Sdyson int reqpage; 63310556Sdyson{ 63412767Sdyson vm_offset_t kva; 63512767Sdyson off_t foff; 6369507Sdg int i, size, bsize, first, firstaddr; 6371549Srgrimes struct vnode *dp, *vp; 6386151Sdg int runpg; 6396151Sdg int runend; 6407178Sdg struct buf *bp; 6415455Sdg int s; 6425455Sdg int error = 0; 6431549Srgrimes 6449507Sdg vp = object->handle; 64511701Sdyson if (vp->v_mount == NULL) 64611701Sdyson return VM_PAGER_BAD; 64711701Sdyson 6481549Srgrimes bsize = vp->v_mount->mnt_stat.f_iosize; 6491549Srgrimes 6501549Srgrimes /* get the UNDERLYING device for the file with VOP_BMAP() */ 6511827Sdg 6521549Srgrimes /* 6531827Sdg * originally, we did not check for an error return value -- assuming 6541827Sdg * an fs always has a bmap entry point -- that assumption is wrong!!! 6551549Srgrimes */ 65612767Sdyson foff = IDX_TO_OFF(m[reqpage]->pindex); 6571827Sdg 6581549Srgrimes /* 6591887Sdg * if we can't bmap, use old VOP code 6601549Srgrimes */ 66110551Sdyson if (VOP_BMAP(vp, 0, &dp, 0, NULL, NULL)) { 6621549Srgrimes for (i = 0; i < count; i++) { 6631549Srgrimes if (i != reqpage) { 6641549Srgrimes vnode_pager_freepage(m[i]); 6651549Srgrimes } 6661549Srgrimes } 6673612Sdg cnt.v_vnodein++; 6683612Sdg cnt.v_vnodepgsin++; 6699507Sdg return vnode_pager_input_old(object, m[reqpage]); 6701549Srgrimes 6711827Sdg /* 6721827Sdg * if the blocksize is smaller than a page size, then use 6731827Sdg * special small filesystem code. NFS sometimes has a small 6741827Sdg * blocksize, but it can handle large reads itself. 6751827Sdg */ 6761827Sdg } else if ((PAGE_SIZE / bsize) > 1 && 6775455Sdg (vp->v_mount->mnt_stat.f_type != MOUNT_NFS)) { 6781827Sdg 6791549Srgrimes for (i = 0; i < count; i++) { 6801549Srgrimes if (i != reqpage) { 6811549Srgrimes vnode_pager_freepage(m[i]); 6821549Srgrimes } 6831549Srgrimes } 6843612Sdg cnt.v_vnodein++; 6853612Sdg cnt.v_vnodepgsin++; 6869507Sdg return vnode_pager_input_smlfs(object, m[reqpage]); 6871549Srgrimes } 6881549Srgrimes /* 6895455Sdg * if ANY DEV_BSIZE blocks are valid on a large filesystem block 6905455Sdg * then, the entire page is valid -- 69125930Sdfr * XXX no it isn't 6921549Srgrimes */ 69325930Sdfr 69425930Sdfr if (m[reqpage]->valid != VM_PAGE_BITS_ALL) 69525930Sdfr m[reqpage]->valid = 0; 69625930Sdfr 6975455Sdg if (m[reqpage]->valid) { 6985455Sdg m[reqpage]->valid = VM_PAGE_BITS_ALL; 6995455Sdg for (i = 0; i < count; i++) { 7005455Sdg if (i != reqpage) 7015455Sdg vnode_pager_freepage(m[i]); 7021549Srgrimes } 7035455Sdg return VM_PAGER_OK; 7041549Srgrimes } 7057178Sdg 7065455Sdg /* 7075455Sdg * here on direct device I/O 7085455Sdg */ 7091549Srgrimes 7106151Sdg firstaddr = -1; 7111549Srgrimes /* 7126151Sdg * calculate the run that includes the required page 7131549Srgrimes */ 7146151Sdg for(first = 0, i = 0; i < count; i = runend) { 71512767Sdyson firstaddr = vnode_pager_addr(vp, 71612767Sdyson IDX_TO_OFF(m[i]->pindex), &runpg); 7176151Sdg if (firstaddr == -1) { 7189507Sdg if (i == reqpage && foff < object->un_pager.vnp.vnp_size) { 7199507Sdg panic("vnode_pager_putpages: unexpected missing page: firstaddr: %d, foff: %ld, vnp_size: %d", 7209507Sdg firstaddr, foff, object->un_pager.vnp.vnp_size); 7216151Sdg } 7221549Srgrimes vnode_pager_freepage(m[i]); 7236151Sdg runend = i + 1; 7246151Sdg first = runend; 7256151Sdg continue; 7261549Srgrimes } 7276151Sdg runend = i + runpg; 7289507Sdg if (runend <= reqpage) { 7296151Sdg int j; 7309507Sdg for (j = i; j < runend; j++) { 7316151Sdg vnode_pager_freepage(m[j]); 7326151Sdg } 7331549Srgrimes } else { 7349507Sdg if (runpg < (count - first)) { 7359507Sdg for (i = first + runpg; i < count; i++) 7366151Sdg vnode_pager_freepage(m[i]); 7376151Sdg count = first + runpg; 7386151Sdg } 7396151Sdg break; 7401549Srgrimes } 7416151Sdg first = runend; 7421549Srgrimes } 7431549Srgrimes 7441549Srgrimes /* 7451827Sdg * the first and last page have been calculated now, move input pages 7461827Sdg * to be zero based... 7471549Srgrimes */ 7481549Srgrimes if (first != 0) { 7491549Srgrimes for (i = first; i < count; i++) { 7501549Srgrimes m[i - first] = m[i]; 7511549Srgrimes } 7521549Srgrimes count -= first; 7531549Srgrimes reqpage -= first; 7541549Srgrimes } 7556151Sdg 7561549Srgrimes /* 7571549Srgrimes * calculate the file virtual address for the transfer 7581549Srgrimes */ 75912767Sdyson foff = IDX_TO_OFF(m[0]->pindex); 7601827Sdg 7611549Srgrimes /* 7621549Srgrimes * calculate the size of the transfer 7631549Srgrimes */ 7641549Srgrimes size = count * PAGE_SIZE; 7659507Sdg if ((foff + size) > object->un_pager.vnp.vnp_size) 7669507Sdg size = object->un_pager.vnp.vnp_size - foff; 7671549Srgrimes 7681549Srgrimes /* 7691549Srgrimes * round up physical size for real devices 7701549Srgrimes */ 7711827Sdg if (dp->v_type == VBLK || dp->v_type == VCHR) 7721549Srgrimes size = (size + DEV_BSIZE - 1) & ~(DEV_BSIZE - 1); 7731549Srgrimes 7745841Sdg bp = getpbuf(); 7755455Sdg kva = (vm_offset_t) bp->b_data; 7761887Sdg 7771549Srgrimes /* 7781549Srgrimes * and map the pages to be read into the kva 7791549Srgrimes */ 7801887Sdg pmap_qenter(kva, m, count); 7811549Srgrimes 7821549Srgrimes /* build a minimal buffer header */ 7831549Srgrimes bp->b_flags = B_BUSY | B_READ | B_CALL; 7841549Srgrimes bp->b_iodone = vnode_pager_iodone; 7851549Srgrimes /* B_PHYS is not set, but it is nice to fill this in */ 7861549Srgrimes bp->b_proc = curproc; 7871549Srgrimes bp->b_rcred = bp->b_wcred = bp->b_proc->p_ucred; 7881827Sdg if (bp->b_rcred != NOCRED) 7891549Srgrimes crhold(bp->b_rcred); 7901827Sdg if (bp->b_wcred != NOCRED) 7911549Srgrimes crhold(bp->b_wcred); 7926626Sdg bp->b_blkno = firstaddr; 7935455Sdg pbgetvp(dp, bp); 7941549Srgrimes bp->b_bcount = size; 7951549Srgrimes bp->b_bufsize = size; 7961549Srgrimes 7973612Sdg cnt.v_vnodein++; 7983612Sdg cnt.v_vnodepgsin += count; 7993612Sdg 8001549Srgrimes /* do the input */ 8011549Srgrimes VOP_STRATEGY(bp); 8023612Sdg 8031549Srgrimes s = splbio(); 8041549Srgrimes /* we definitely need to be at splbio here */ 8051549Srgrimes 8061549Srgrimes while ((bp->b_flags & B_DONE) == 0) { 8079356Sdg tsleep(bp, PVM, "vnread", 0); 8081549Srgrimes } 8091549Srgrimes splx(s); 8101549Srgrimes if ((bp->b_flags & B_ERROR) != 0) 8111549Srgrimes error = EIO; 8121549Srgrimes 8131549Srgrimes if (!error) { 8141549Srgrimes if (size != count * PAGE_SIZE) 8151827Sdg bzero((caddr_t) kva + size, PAGE_SIZE * count - size); 8161549Srgrimes } 8175455Sdg pmap_qremove(kva, count); 8181549Srgrimes 8191549Srgrimes /* 8201549Srgrimes * free the buffer header back to the swap buffer pool 8211549Srgrimes */ 8221549Srgrimes relpbuf(bp); 8231549Srgrimes 8241549Srgrimes for (i = 0; i < count; i++) { 82517334Sdyson pmap_clear_modify(VM_PAGE_TO_PHYS(m[i])); 8265455Sdg m[i]->dirty = 0; 8275455Sdg m[i]->valid = VM_PAGE_BITS_ALL; 82810669Sdyson m[i]->flags &= ~PG_ZERO; 8291549Srgrimes if (i != reqpage) { 8301827Sdg 8311549Srgrimes /* 8321827Sdg * whether or not to leave the page activated is up in 8331827Sdg * the air, but we should put the page on a page queue 8341827Sdg * somewhere. (it already is in the object). Result: 8351827Sdg * It appears that emperical results show that 8361827Sdg * deactivating pages is best. 8371549Srgrimes */ 8381827Sdg 8391549Srgrimes /* 8401827Sdg * just in case someone was asking for this page we 8411827Sdg * now tell them that it is ok to use 8421549Srgrimes */ 8431549Srgrimes if (!error) { 8445841Sdg vm_page_deactivate(m[i]); 8451549Srgrimes PAGE_WAKEUP(m[i]); 8461549Srgrimes } else { 8471549Srgrimes vnode_pager_freepage(m[i]); 8481549Srgrimes } 8491549Srgrimes } 8501549Srgrimes } 8511549Srgrimes if (error) { 8529507Sdg printf("vnode_pager_getpages: I/O read error\n"); 8531549Srgrimes } 8544207Sdg return (error ? VM_PAGER_ERROR : VM_PAGER_OK); 8551549Srgrimes} 8561549Srgrimes 85712820Sphkstatic int 85810556Sdysonvnode_pager_putpages(object, m, count, sync, rtvals) 85910556Sdyson vm_object_t object; 86010556Sdyson vm_page_t *m; 86110556Sdyson int count; 86210556Sdyson boolean_t sync; 86310556Sdyson int *rtvals; 86410556Sdyson{ 86510556Sdyson int rtval; 86610556Sdyson struct vnode *vp; 86718973Sdyson 86818973Sdyson if (object->flags & OBJ_VNODE_GONE) 86918973Sdyson return VM_PAGER_ERROR; 87018973Sdyson 87110556Sdyson vp = object->handle; 87211701Sdyson rtval = VOP_PUTPAGES(vp, m, count*PAGE_SIZE, sync, rtvals, 0); 87310556Sdyson if (rtval == EOPNOTSUPP) 87411943Sbde return vnode_pager_leaf_putpages(object, m, count, sync, rtvals); 87510556Sdyson else 87610556Sdyson return rtval; 87710556Sdyson} 87810556Sdyson 8791549Srgrimes/* 8801549Srgrimes * generic vnode pager output routine 8811549Srgrimes */ 88210556Sdysonstatic int 88310556Sdysonvnode_pager_leaf_putpages(object, m, count, sync, rtvals) 8849507Sdg vm_object_t object; 8851549Srgrimes vm_page_t *m; 8865455Sdg int count; 8879507Sdg boolean_t sync; 8885455Sdg int *rtvals; 8891549Srgrimes{ 8907695Sdg int i; 8911549Srgrimes 8927695Sdg struct vnode *vp; 8937695Sdg int maxsize, ncount; 89412767Sdyson vm_ooffset_t poffset; 8957695Sdg struct uio auio; 8967695Sdg struct iovec aiov; 8977695Sdg int error; 8981549Srgrimes 8999507Sdg vp = object->handle;; 9001827Sdg for (i = 0; i < count; i++) 9011549Srgrimes rtvals[i] = VM_PAGER_AGAIN; 9021549Srgrimes 90312767Sdyson if ((int) m[0]->pindex < 0) { 90412767Sdyson printf("vnode_pager_putpages: attempt to write meta-data!!! -- 0x%x(%x)\n", m[0]->pindex, m[0]->dirty); 9057695Sdg rtvals[0] = VM_PAGER_BAD; 9067695Sdg return VM_PAGER_BAD; 9075455Sdg } 9087178Sdg 9097695Sdg maxsize = count * PAGE_SIZE; 9107695Sdg ncount = count; 9111549Srgrimes 91212767Sdyson poffset = IDX_TO_OFF(m[0]->pindex); 91312767Sdyson if (maxsize + poffset > object->un_pager.vnp.vnp_size) { 91412767Sdyson if (object->un_pager.vnp.vnp_size > poffset) 91512767Sdyson maxsize = object->un_pager.vnp.vnp_size - poffset; 9168585Sdg else 9178585Sdg maxsize = 0; 91815583Sphk ncount = btoc(maxsize); 9198585Sdg if (ncount < count) { 9208585Sdg for (i = ncount; i < count; i++) { 9217695Sdg rtvals[i] = VM_PAGER_BAD; 9221549Srgrimes } 92312767Sdyson#ifdef BOGUS 9248585Sdg if (ncount == 0) { 92512767Sdyson printf("vnode_pager_putpages: write past end of file: %d, %lu\n", 92612767Sdyson poffset, 92712767Sdyson (unsigned long) object->un_pager.vnp.vnp_size); 9287695Sdg return rtvals[0]; 9297695Sdg } 93012767Sdyson#endif 9311549Srgrimes } 9321541Srgrimes } 9337695Sdg 9348585Sdg for (i = 0; i < count; i++) { 9358585Sdg m[i]->busy++; 9367695Sdg m[i]->flags &= ~PG_BUSY; 9371549Srgrimes } 9381827Sdg 9397695Sdg aiov.iov_base = (caddr_t) 0; 9407695Sdg aiov.iov_len = maxsize; 9417695Sdg auio.uio_iov = &aiov; 9427695Sdg auio.uio_iovcnt = 1; 94312767Sdyson auio.uio_offset = poffset; 9447695Sdg auio.uio_segflg = UIO_NOCOPY; 9457695Sdg auio.uio_rw = UIO_WRITE; 9467695Sdg auio.uio_resid = maxsize; 9477695Sdg auio.uio_procp = (struct proc *) 0; 94812767Sdyson error = VOP_WRITE(vp, &auio, IO_VMIO|(sync?IO_SYNC:0), curproc->p_ucred); 9493612Sdg cnt.v_vnodeout++; 9507695Sdg cnt.v_vnodepgsout += ncount; 9513612Sdg 9528585Sdg if (error) { 9539507Sdg printf("vnode_pager_putpages: I/O error %d\n", error); 9547695Sdg } 9558585Sdg if (auio.uio_resid) { 95612820Sphk printf("vnode_pager_putpages: residual I/O %d at %ld\n", 95712767Sdyson auio.uio_resid, m[0]->pindex); 9587695Sdg } 9598585Sdg for (i = 0; i < count; i++) { 9608585Sdg m[i]->busy--; 9618585Sdg if (i < ncount) { 9627695Sdg rtvals[i] = VM_PAGER_OK; 9637695Sdg } 9648585Sdg if ((m[i]->busy == 0) && (m[i]->flags & PG_WANTED)) 9659507Sdg wakeup(m[i]); 9667695Sdg } 9677695Sdg return rtvals[0]; 9687695Sdg} 9691549Srgrimes 9707695Sdgstruct vnode * 9719507Sdgvnode_pager_lock(object) 9729507Sdg vm_object_t object; 9739507Sdg{ 97422521Sdyson struct proc *p = curproc; /* XXX */ 97522521Sdyson 9769507Sdg for (; object != NULL; object = object->backing_object) { 9779507Sdg if (object->type != OBJT_VNODE) 9787695Sdg continue; 9791549Srgrimes 98030137Sdyson vn_lock(object->handle, 98130137Sdyson LK_NOPAUSE | LK_SHARED | LK_RETRY | LK_CANRECURSE, p); 9829507Sdg return object->handle; 9831549Srgrimes } 9849507Sdg return NULL; 9857695Sdg} 986