vnode_pager.c revision 12423
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 4112423Sphk * $Id: vnode_pager.c,v 1.52 1995/10/30 17:56:30 bde 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> 565455Sdg#include <sys/kernel.h> 571541Srgrimes#include <sys/proc.h> 581541Srgrimes#include <sys/malloc.h> 591541Srgrimes#include <sys/vnode.h> 601541Srgrimes#include <sys/uio.h> 611541Srgrimes#include <sys/mount.h> 629507Sdg#include <sys/buf.h> 631541Srgrimes 641541Srgrimes#include <vm/vm.h> 651541Srgrimes#include <vm/vm_page.h> 669507Sdg#include <vm/vm_pager.h> 671541Srgrimes#include <vm/vnode_pager.h> 681541Srgrimes 6911943Sbdeextern vm_offset_t vnode_pager_addr __P((struct vnode *vp, vm_offset_t address, 7011943Sbde int *run)); 7111943Sbdeextern void vnode_pager_iodone __P((struct buf *bp)); 7211943Sbdeextern int vnode_pager_input_smlfs __P((vm_object_t object, vm_page_t m)); 7311943Sbdeextern int vnode_pager_input_old __P((vm_object_t object, vm_page_t m)); 7411943Sbde 751541Srgrimesstruct pagerops vnodepagerops = { 769507Sdg NULL, 771541Srgrimes vnode_pager_alloc, 781541Srgrimes vnode_pager_dealloc, 799507Sdg vnode_pager_getpages, 809507Sdg vnode_pager_putpages, 819507Sdg vnode_pager_haspage, 829507Sdg NULL 831541Srgrimes}; 841541Srgrimes 8511943Sbdestatic int vnode_pager_leaf_getpages __P((vm_object_t object, vm_page_t *m, 8611943Sbde int count, int reqpage)); 8711943Sbdestatic int vnode_pager_leaf_putpages __P((vm_object_t object, vm_page_t *m, 8811943Sbde int count, boolean_t sync, 8911943Sbde int *rtvals)); 9010556Sdyson 911541Srgrimes/* 921541Srgrimes * Allocate (or lookup) pager for a vnode. 931541Srgrimes * Handle is a vnode pointer. 941541Srgrimes */ 959507Sdgvm_object_t 961549Srgrimesvnode_pager_alloc(handle, size, prot, offset) 978416Sdg void *handle; 981541Srgrimes vm_size_t size; 991541Srgrimes vm_prot_t prot; 1001549Srgrimes vm_offset_t offset; 1011541Srgrimes{ 1029456Sdg vm_object_t object; 1031541Srgrimes struct vnode *vp; 1041541Srgrimes 1051541Srgrimes /* 1061541Srgrimes * Pageout to vnode, no can do yet. 1071541Srgrimes */ 1081541Srgrimes if (handle == NULL) 1091827Sdg return (NULL); 1101541Srgrimes 1119411Sdg vp = (struct vnode *) handle; 1129411Sdg 1131541Srgrimes /* 1149411Sdg * Prevent race condition when allocating the object. This 1159411Sdg * can happen with NFS vnodes since the nfsnode isn't locked. 1161541Srgrimes */ 1179411Sdg while (vp->v_flag & VOLOCK) { 1189411Sdg vp->v_flag |= VOWANT; 1199411Sdg tsleep(vp, PVM, "vnpobj", 0); 1209411Sdg } 1219411Sdg vp->v_flag |= VOLOCK; 1229411Sdg 1239411Sdg /* 1249411Sdg * If the object is being terminated, wait for it to 1259411Sdg * go away. 1269411Sdg */ 1279507Sdg while (((object = vp->v_object) != NULL) && (object->flags & OBJ_DEAD)) { 1289356Sdg tsleep(object, PVM, "vadead", 0); 1299507Sdg } 1305455Sdg 1319507Sdg if (object == NULL) { 1321541Srgrimes /* 1331541Srgrimes * And an object of the appropriate size 1341541Srgrimes */ 1359507Sdg object = vm_object_allocate(OBJT_VNODE, round_page(size)); 1369456Sdg object->flags = OBJ_CANPERSIST; 1371827Sdg 1381541Srgrimes /* 1399507Sdg * Hold a reference to the vnode and initialize object data. 1401541Srgrimes */ 1411541Srgrimes VREF(vp); 1429507Sdg object->un_pager.vnp.vnp_size = size; 1431549Srgrimes 1449507Sdg object->handle = handle; 1459507Sdg vp->v_object = object; 1461541Srgrimes } else { 1471541Srgrimes /* 1489507Sdg * vm_object_reference() will remove the object from the cache if 1499507Sdg * found and gain a reference to the object. 1501541Srgrimes */ 1519507Sdg vm_object_reference(object); 1521541Srgrimes } 1539411Sdg 1549411Sdg if (vp->v_type == VREG) 1557695Sdg vp->v_flag |= VVMIO; 1569411Sdg 1579411Sdg vp->v_flag &= ~VOLOCK; 1589411Sdg if (vp->v_flag & VOWANT) { 1599411Sdg vp->v_flag &= ~VOWANT; 1609411Sdg wakeup(vp); 1619411Sdg } 1629507Sdg return (object); 1631541Srgrimes} 1641541Srgrimes 1651549Srgrimesvoid 1669507Sdgvnode_pager_dealloc(object) 1679507Sdg vm_object_t object; 1681541Srgrimes{ 1699507Sdg register struct vnode *vp = object->handle; 1701541Srgrimes 1719507Sdg if (vp == NULL) 1729507Sdg panic("vnode_pager_dealloc: pager already dealloced"); 1739507Sdg 1749507Sdg if (object->paging_in_progress) { 1755455Sdg int s = splbio(); 1769507Sdg while (object->paging_in_progress) { 1779507Sdg object->flags |= OBJ_PIPWNT; 1789507Sdg tsleep(object, PVM, "vnpdea", 0); 1795455Sdg } 1805455Sdg splx(s); 1811541Srgrimes } 1821541Srgrimes 1839507Sdg object->handle = NULL; 1841827Sdg 1859507Sdg vp->v_object = NULL; 1869507Sdg vp->v_flag &= ~(VTEXT | VVMIO); 1879507Sdg vp->v_flag |= VAGE; 1889507Sdg vrele(vp); 1891549Srgrimes} 1901541Srgrimes 1911549Srgrimesboolean_t 1929507Sdgvnode_pager_haspage(object, offset, before, after) 1939507Sdg vm_object_t object; 1941541Srgrimes vm_offset_t offset; 1959507Sdg int *before; 1969507Sdg int *after; 1971541Srgrimes{ 1989507Sdg struct vnode *vp = object->handle; 1991541Srgrimes daddr_t bn; 20012423Sphk int err; 20110556Sdyson daddr_t reqblock; 20211701Sdyson int poff; 20311701Sdyson int bsize; 20411701Sdyson int pagesperblock; 2051541Srgrimes 2061541Srgrimes /* 2075455Sdg * If filesystem no longer mounted or offset beyond end of file we do 2085455Sdg * not have the page. 2091541Srgrimes */ 2109507Sdg if ((vp->v_mount == NULL) || (offset >= object->un_pager.vnp.vnp_size)) 2114797Sdg return FALSE; 2121541Srgrimes 21311576Sdg bsize = vp->v_mount->mnt_stat.f_iosize; 21410556Sdyson pagesperblock = bsize / PAGE_SIZE; 21510556Sdyson reqblock = offset / bsize; 21610556Sdyson err = VOP_BMAP(vp, reqblock, (struct vnode **) 0, &bn, 21710556Sdyson after, before); 2188876Srgrimes if (err) 2199507Sdg return TRUE; 22010702Sdyson if ( bn == -1) 22110576Sdyson return FALSE; 22210556Sdyson poff = (offset - (reqblock * bsize)) / PAGE_SIZE; 22310556Sdyson if (before) { 22410556Sdyson *before *= pagesperblock; 22510556Sdyson *before += poff; 22610556Sdyson } 22710556Sdyson if (after) { 22810669Sdyson int numafter; 22910556Sdyson *after *= pagesperblock; 23010669Sdyson numafter = pagesperblock - (poff + 1); 23110669Sdyson if (offset + numafter * PAGE_SIZE > object->un_pager.vnp.vnp_size) { 23210669Sdyson numafter = (object->un_pager.vnp.vnp_size - offset)/PAGE_SIZE; 23310669Sdyson } 23410669Sdyson *after += numafter; 23510556Sdyson } 23610576Sdyson return TRUE; 2371541Srgrimes} 2381541Srgrimes 2391541Srgrimes/* 2401541Srgrimes * Lets the VM system know about a change in size for a file. 2419507Sdg * We adjust our own internal size and flush any cached pages in 2421541Srgrimes * the associated object that are affected by the size change. 2431541Srgrimes * 2441541Srgrimes * Note: this routine may be invoked as a result of a pager put 2451541Srgrimes * operation (possibly at object termination time), so we must be careful. 2461541Srgrimes */ 2471541Srgrimesvoid 2481541Srgrimesvnode_pager_setsize(vp, nsize) 2491541Srgrimes struct vnode *vp; 2505455Sdg u_long nsize; 2511541Srgrimes{ 2529507Sdg vm_object_t object = vp->v_object; 2531541Srgrimes 2549507Sdg if (object == NULL) 2551541Srgrimes return; 2561827Sdg 2571541Srgrimes /* 2581541Srgrimes * Hasn't changed size 2591541Srgrimes */ 2609507Sdg if (nsize == object->un_pager.vnp.vnp_size) 2613374Sdg return; 2621827Sdg 2631541Srgrimes /* 2641827Sdg * File has shrunk. Toss any cached pages beyond the new EOF. 2651541Srgrimes */ 2669507Sdg if (nsize < object->un_pager.vnp.vnp_size) { 2679507Sdg if (round_page((vm_offset_t) nsize) < object->un_pager.vnp.vnp_size) { 2685455Sdg vm_object_page_remove(object, 2699507Sdg round_page((vm_offset_t) nsize), object->un_pager.vnp.vnp_size, FALSE); 2705455Sdg } 2711827Sdg /* 2721827Sdg * this gets rid of garbage at the end of a page that is now 2731827Sdg * only partially backed by the vnode... 2741827Sdg */ 2751827Sdg if (nsize & PAGE_MASK) { 2761827Sdg vm_offset_t kva; 2771827Sdg vm_page_t m; 2781827Sdg 2791827Sdg m = vm_page_lookup(object, trunc_page((vm_offset_t) nsize)); 2801827Sdg if (m) { 2811827Sdg kva = vm_pager_map_page(m); 2821827Sdg bzero((caddr_t) kva + (nsize & PAGE_MASK), 2835455Sdg round_page(nsize) - nsize); 2841827Sdg vm_pager_unmap_page(kva); 2851827Sdg } 2861827Sdg } 2871541Srgrimes } 2889507Sdg object->un_pager.vnp.vnp_size = (vm_offset_t) nsize; 2891827Sdg object->size = round_page(nsize); 2901541Srgrimes} 2911541Srgrimes 2921541Srgrimesvoid 2931541Srgrimesvnode_pager_umount(mp) 2941541Srgrimes register struct mount *mp; 2951541Srgrimes{ 2969507Sdg struct vnode *vp, *nvp; 2971541Srgrimes 2989507Sdgloop: 2999507Sdg for (vp = mp->mnt_vnodelist.lh_first; vp != NULL; vp = nvp) { 3001541Srgrimes /* 3019507Sdg * Vnode can be reclaimed by getnewvnode() while we 3029507Sdg * traverse the list. 3039507Sdg */ 3049507Sdg if (vp->v_mount != mp) 3059507Sdg goto loop; 3069507Sdg 3079507Sdg /* 3081827Sdg * Save the next pointer now since uncaching may terminate the 3099507Sdg * object and render vnode invalid 3101541Srgrimes */ 3119507Sdg nvp = vp->v_mntvnodes.le_next; 3129507Sdg 3139507Sdg if (vp->v_object != NULL) { 3147162Sdg VOP_LOCK(vp); 3159507Sdg vnode_pager_uncache(vp); 3167162Sdg VOP_UNLOCK(vp); 3177162Sdg } 3181541Srgrimes } 3191541Srgrimes} 3201541Srgrimes 3211541Srgrimes/* 3221541Srgrimes * Remove vnode associated object from the object cache. 3237162Sdg * This routine must be called with the vnode locked. 3241541Srgrimes * 3257162Sdg * XXX unlock the vnode. 3267162Sdg * We must do this since uncaching the object may result in its 3277162Sdg * destruction which may initiate paging activity which may necessitate 3287162Sdg * re-locking the vnode. 3291549Srgrimes */ 3309507Sdgvoid 3311549Srgrimesvnode_pager_uncache(vp) 3329507Sdg struct vnode *vp; 3331549Srgrimes{ 3349507Sdg vm_object_t object; 3351549Srgrimes 3361549Srgrimes /* 3371549Srgrimes * Not a mapped vnode 3381549Srgrimes */ 3399356Sdg object = vp->v_object; 3405455Sdg if (object == NULL) 3419507Sdg return; 3425455Sdg 3439507Sdg vm_object_reference(object); 3449507Sdg VOP_UNLOCK(vp); 3459507Sdg pager_cache(object, FALSE); 3469507Sdg VOP_LOCK(vp); 3479507Sdg return; 3481549Srgrimes} 3491541Srgrimes 3501541Srgrimes 3511549Srgrimesvoid 3521549Srgrimesvnode_pager_freepage(m) 3531549Srgrimes vm_page_t m; 3541541Srgrimes{ 3551549Srgrimes PAGE_WAKEUP(m); 3561549Srgrimes vm_page_free(m); 3571549Srgrimes} 3581549Srgrimes 3591549Srgrimes/* 3601549Srgrimes * calculate the linear (byte) disk address of specified virtual 3611549Srgrimes * file address 3621549Srgrimes */ 3631549Srgrimesvm_offset_t 3646151Sdgvnode_pager_addr(vp, address, run) 3651549Srgrimes struct vnode *vp; 3661549Srgrimes vm_offset_t address; 3676151Sdg int *run; 3681549Srgrimes{ 3695455Sdg int rtaddress; 3705455Sdg int bsize; 3711549Srgrimes vm_offset_t block; 3721549Srgrimes struct vnode *rtvp; 3735455Sdg int err; 3745455Sdg int vblock, voffset; 3751549Srgrimes 3765455Sdg if ((int) address < 0) 3775455Sdg return -1; 3785455Sdg 37911701Sdyson if (vp->v_mount == NULL) 38011701Sdyson return -1; 38111701Sdyson 3821549Srgrimes bsize = vp->v_mount->mnt_stat.f_iosize; 3831549Srgrimes vblock = address / bsize; 3841549Srgrimes voffset = address % bsize; 3851549Srgrimes 38610551Sdyson err = VOP_BMAP(vp, vblock, &rtvp, &block, run, NULL); 3871549Srgrimes 3886151Sdg if (err || (block == -1)) 3891549Srgrimes rtaddress = -1; 3906151Sdg else { 3916626Sdg rtaddress = block + voffset / DEV_BSIZE; 3926151Sdg if( run) { 3936151Sdg *run += 1; 3946151Sdg *run *= bsize/PAGE_SIZE; 3956151Sdg *run -= voffset/PAGE_SIZE; 3966151Sdg } 3976151Sdg } 3981549Srgrimes 3991549Srgrimes return rtaddress; 4001549Srgrimes} 4011549Srgrimes 4021549Srgrimes/* 4031549Srgrimes * interrupt routine for I/O completion 4041549Srgrimes */ 4051549Srgrimesvoid 4061549Srgrimesvnode_pager_iodone(bp) 4071549Srgrimes struct buf *bp; 4081549Srgrimes{ 4091549Srgrimes bp->b_flags |= B_DONE; 4109507Sdg wakeup(bp); 4111549Srgrimes} 4121549Srgrimes 4131549Srgrimes/* 4141549Srgrimes * small block file system vnode pager input 4151549Srgrimes */ 4161549Srgrimesint 4179507Sdgvnode_pager_input_smlfs(object, m) 4189507Sdg vm_object_t object; 4191549Srgrimes vm_page_t m; 4201549Srgrimes{ 4215455Sdg int i; 4225455Sdg int s; 4231549Srgrimes struct vnode *dp, *vp; 4241549Srgrimes struct buf *bp; 4251549Srgrimes vm_offset_t kva; 4265455Sdg int fileaddr; 4271549Srgrimes vm_offset_t bsize; 4285455Sdg int error = 0; 4291549Srgrimes 4309507Sdg vp = object->handle; 43111701Sdyson if (vp->v_mount == NULL) 43211701Sdyson return VM_PAGER_BAD; 43311701Sdyson 4341549Srgrimes bsize = vp->v_mount->mnt_stat.f_iosize; 4351549Srgrimes 4367178Sdg 43710551Sdyson VOP_BMAP(vp, 0, &dp, 0, NULL, NULL); 4381549Srgrimes 4391549Srgrimes kva = vm_pager_map_page(m); 4401549Srgrimes 4411827Sdg for (i = 0; i < PAGE_SIZE / bsize; i++) { 4421827Sdg 4435455Sdg if ((vm_page_bits(m->offset + i * bsize, bsize) & m->valid)) 4445455Sdg continue; 4451549Srgrimes 4466151Sdg fileaddr = vnode_pager_addr(vp, m->offset + i * bsize, (int *)0); 4471827Sdg if (fileaddr != -1) { 4481549Srgrimes bp = getpbuf(); 4491549Srgrimes 4501827Sdg /* build a minimal buffer header */ 4511549Srgrimes bp->b_flags = B_BUSY | B_READ | B_CALL; 4521549Srgrimes bp->b_iodone = vnode_pager_iodone; 4531549Srgrimes bp->b_proc = curproc; 4541549Srgrimes bp->b_rcred = bp->b_wcred = bp->b_proc->p_ucred; 4551827Sdg if (bp->b_rcred != NOCRED) 4561549Srgrimes crhold(bp->b_rcred); 4571827Sdg if (bp->b_wcred != NOCRED) 4581549Srgrimes crhold(bp->b_wcred); 4591549Srgrimes bp->b_un.b_addr = (caddr_t) kva + i * bsize; 4606626Sdg bp->b_blkno = fileaddr; 4615455Sdg pbgetvp(dp, bp); 4621549Srgrimes bp->b_bcount = bsize; 4631549Srgrimes bp->b_bufsize = bsize; 4641827Sdg 4651827Sdg /* do the input */ 4661549Srgrimes VOP_STRATEGY(bp); 4671549Srgrimes 4681827Sdg /* we definitely need to be at splbio here */ 4691549Srgrimes 4701549Srgrimes s = splbio(); 4711549Srgrimes while ((bp->b_flags & B_DONE) == 0) { 4729356Sdg tsleep(bp, PVM, "vnsrd", 0); 4731549Srgrimes } 4741549Srgrimes splx(s); 4751549Srgrimes if ((bp->b_flags & B_ERROR) != 0) 4761549Srgrimes error = EIO; 4771549Srgrimes 4781827Sdg /* 4791827Sdg * free the buffer header back to the swap buffer pool 4801827Sdg */ 4811549Srgrimes relpbuf(bp); 4821827Sdg if (error) 4831549Srgrimes break; 4845455Sdg 48510556Sdyson vm_page_set_validclean(m, (i * bsize) & (PAGE_SIZE-1), bsize); 4861549Srgrimes } else { 48710669Sdyson vm_page_set_validclean(m, (i * bsize) & (PAGE_SIZE-1), bsize); 4881549Srgrimes bzero((caddr_t) kva + i * bsize, bsize); 4891549Srgrimes } 4901549Srgrimes } 4911549Srgrimes vm_pager_unmap_page(kva); 4925455Sdg pmap_clear_modify(VM_PAGE_TO_PHYS(m)); 49310669Sdyson m->flags &= ~PG_ZERO; 4941827Sdg if (error) { 4954207Sdg return VM_PAGER_ERROR; 4961549Srgrimes } 4971549Srgrimes return VM_PAGER_OK; 4981549Srgrimes 4991549Srgrimes} 5001549Srgrimes 5011549Srgrimes 5021549Srgrimes/* 5031549Srgrimes * old style vnode pager output routine 5041549Srgrimes */ 5051549Srgrimesint 5069507Sdgvnode_pager_input_old(object, m) 5079507Sdg vm_object_t object; 5081549Srgrimes vm_page_t m; 5091549Srgrimes{ 5101541Srgrimes struct uio auio; 5111541Srgrimes struct iovec aiov; 5125455Sdg int error; 5135455Sdg int size; 5141549Srgrimes vm_offset_t kva; 5151549Srgrimes 5161549Srgrimes error = 0; 5171827Sdg 5181549Srgrimes /* 5191549Srgrimes * Return failure if beyond current EOF 5201549Srgrimes */ 5219507Sdg if (m->offset >= object->un_pager.vnp.vnp_size) { 5221549Srgrimes return VM_PAGER_BAD; 5231549Srgrimes } else { 5241549Srgrimes size = PAGE_SIZE; 5259507Sdg if (m->offset + size > object->un_pager.vnp.vnp_size) 5269507Sdg size = object->un_pager.vnp.vnp_size - m->offset; 5277178Sdg 5285455Sdg /* 5295455Sdg * Allocate a kernel virtual address and initialize so that 5305455Sdg * we can use VOP_READ/WRITE routines. 5315455Sdg */ 5321549Srgrimes kva = vm_pager_map_page(m); 5337178Sdg 5341827Sdg aiov.iov_base = (caddr_t) kva; 5351549Srgrimes aiov.iov_len = size; 5361549Srgrimes auio.uio_iov = &aiov; 5371549Srgrimes auio.uio_iovcnt = 1; 5385455Sdg auio.uio_offset = m->offset; 5391549Srgrimes auio.uio_segflg = UIO_SYSSPACE; 5401549Srgrimes auio.uio_rw = UIO_READ; 5411549Srgrimes auio.uio_resid = size; 5421827Sdg auio.uio_procp = (struct proc *) 0; 5431549Srgrimes 5449507Sdg error = VOP_READ(object->handle, &auio, 0, curproc->p_ucred); 5451549Srgrimes if (!error) { 5461549Srgrimes register int count = size - auio.uio_resid; 5471549Srgrimes 5481549Srgrimes if (count == 0) 5491549Srgrimes error = EINVAL; 5501549Srgrimes else if (count != PAGE_SIZE) 5511827Sdg bzero((caddr_t) kva + count, PAGE_SIZE - count); 5521549Srgrimes } 5531549Srgrimes vm_pager_unmap_page(kva); 5541549Srgrimes } 5551549Srgrimes pmap_clear_modify(VM_PAGE_TO_PHYS(m)); 5565455Sdg m->dirty = 0; 55710669Sdyson m->flags &= ~PG_ZERO; 5584207Sdg return error ? VM_PAGER_ERROR : VM_PAGER_OK; 5591549Srgrimes} 5601549Srgrimes 5611549Srgrimes/* 5621549Srgrimes * generic vnode pager input routine 5631549Srgrimes */ 56410556Sdyson 5651549Srgrimesint 5669507Sdgvnode_pager_getpages(object, m, count, reqpage) 5679507Sdg vm_object_t object; 5681549Srgrimes vm_page_t *m; 5699507Sdg int count; 5709507Sdg int reqpage; 5711549Srgrimes{ 57210556Sdyson int rtval; 57310556Sdyson struct vnode *vp; 57410556Sdyson vp = object->handle; 57511701Sdyson rtval = VOP_GETPAGES(vp, m, count*PAGE_SIZE, reqpage, 0); 57610556Sdyson if (rtval == EOPNOTSUPP) 57711943Sbde return vnode_pager_leaf_getpages(object, m, count, reqpage); 57810556Sdyson else 57910556Sdyson return rtval; 58010556Sdyson} 58110556Sdyson 58210556Sdysonstatic int 58310556Sdysonvnode_pager_leaf_getpages(object, m, count, reqpage) 58410556Sdyson vm_object_t object; 58510556Sdyson vm_page_t *m; 58610556Sdyson int count; 58710556Sdyson int reqpage; 58810556Sdyson{ 5891541Srgrimes vm_offset_t kva, foff; 5909507Sdg int i, size, bsize, first, firstaddr; 5911549Srgrimes struct vnode *dp, *vp; 5926151Sdg int runpg; 5936151Sdg int runend; 5947178Sdg struct buf *bp; 5955455Sdg int s; 5965455Sdg int error = 0; 5971549Srgrimes 5989507Sdg vp = object->handle; 59911701Sdyson if (vp->v_mount == NULL) 60011701Sdyson return VM_PAGER_BAD; 60111701Sdyson 6021549Srgrimes bsize = vp->v_mount->mnt_stat.f_iosize; 6031549Srgrimes 6041549Srgrimes /* get the UNDERLYING device for the file with VOP_BMAP() */ 6051827Sdg 6061549Srgrimes /* 6071827Sdg * originally, we did not check for an error return value -- assuming 6081827Sdg * an fs always has a bmap entry point -- that assumption is wrong!!! 6091549Srgrimes */ 6105455Sdg foff = m[reqpage]->offset; 6111827Sdg 6121549Srgrimes /* 6131887Sdg * if we can't bmap, use old VOP code 6141549Srgrimes */ 61510551Sdyson if (VOP_BMAP(vp, 0, &dp, 0, NULL, NULL)) { 6161549Srgrimes for (i = 0; i < count; i++) { 6171549Srgrimes if (i != reqpage) { 6181549Srgrimes vnode_pager_freepage(m[i]); 6191549Srgrimes } 6201549Srgrimes } 6213612Sdg cnt.v_vnodein++; 6223612Sdg cnt.v_vnodepgsin++; 6239507Sdg return vnode_pager_input_old(object, m[reqpage]); 6241549Srgrimes 6251827Sdg /* 6261827Sdg * if the blocksize is smaller than a page size, then use 6271827Sdg * special small filesystem code. NFS sometimes has a small 6281827Sdg * blocksize, but it can handle large reads itself. 6291827Sdg */ 6301827Sdg } else if ((PAGE_SIZE / bsize) > 1 && 6315455Sdg (vp->v_mount->mnt_stat.f_type != MOUNT_NFS)) { 6321827Sdg 6331549Srgrimes for (i = 0; i < count; i++) { 6341549Srgrimes if (i != reqpage) { 6351549Srgrimes vnode_pager_freepage(m[i]); 6361549Srgrimes } 6371549Srgrimes } 6383612Sdg cnt.v_vnodein++; 6393612Sdg cnt.v_vnodepgsin++; 6409507Sdg return vnode_pager_input_smlfs(object, m[reqpage]); 6411549Srgrimes } 6421549Srgrimes /* 6435455Sdg * if ANY DEV_BSIZE blocks are valid on a large filesystem block 6445455Sdg * then, the entire page is valid -- 6451549Srgrimes */ 6465455Sdg if (m[reqpage]->valid) { 6475455Sdg m[reqpage]->valid = VM_PAGE_BITS_ALL; 6485455Sdg for (i = 0; i < count; i++) { 6495455Sdg if (i != reqpage) 6505455Sdg vnode_pager_freepage(m[i]); 6511549Srgrimes } 6525455Sdg return VM_PAGER_OK; 6531549Srgrimes } 6547178Sdg 6555455Sdg /* 6565455Sdg * here on direct device I/O 6575455Sdg */ 6581549Srgrimes 6596151Sdg firstaddr = -1; 6601549Srgrimes /* 6616151Sdg * calculate the run that includes the required page 6621549Srgrimes */ 6636151Sdg for(first = 0, i = 0; i < count; i = runend) { 6646151Sdg firstaddr = vnode_pager_addr(vp, m[i]->offset, &runpg); 6656151Sdg if (firstaddr == -1) { 6669507Sdg if (i == reqpage && foff < object->un_pager.vnp.vnp_size) { 6679507Sdg panic("vnode_pager_putpages: unexpected missing page: firstaddr: %d, foff: %ld, vnp_size: %d", 6689507Sdg firstaddr, foff, object->un_pager.vnp.vnp_size); 6696151Sdg } 6701549Srgrimes vnode_pager_freepage(m[i]); 6716151Sdg runend = i + 1; 6726151Sdg first = runend; 6736151Sdg continue; 6741549Srgrimes } 6756151Sdg runend = i + runpg; 6769507Sdg if (runend <= reqpage) { 6776151Sdg int j; 6789507Sdg for (j = i; j < runend; j++) { 6796151Sdg vnode_pager_freepage(m[j]); 6806151Sdg } 6811549Srgrimes } else { 6829507Sdg if (runpg < (count - first)) { 6839507Sdg for (i = first + runpg; i < count; i++) 6846151Sdg vnode_pager_freepage(m[i]); 6856151Sdg count = first + runpg; 6866151Sdg } 6876151Sdg break; 6881549Srgrimes } 6896151Sdg first = runend; 6901549Srgrimes } 6911549Srgrimes 6921549Srgrimes /* 6931827Sdg * the first and last page have been calculated now, move input pages 6941827Sdg * to be zero based... 6951549Srgrimes */ 6961549Srgrimes if (first != 0) { 6971549Srgrimes for (i = first; i < count; i++) { 6981549Srgrimes m[i - first] = m[i]; 6991549Srgrimes } 7001549Srgrimes count -= first; 7011549Srgrimes reqpage -= first; 7021549Srgrimes } 7036151Sdg 7041549Srgrimes /* 7051549Srgrimes * calculate the file virtual address for the transfer 7061549Srgrimes */ 7075455Sdg foff = m[0]->offset; 7081827Sdg 7091549Srgrimes /* 7101549Srgrimes * calculate the size of the transfer 7111549Srgrimes */ 7121549Srgrimes size = count * PAGE_SIZE; 7139507Sdg if ((foff + size) > object->un_pager.vnp.vnp_size) 7149507Sdg size = object->un_pager.vnp.vnp_size - foff; 7151549Srgrimes 7161549Srgrimes /* 7171549Srgrimes * round up physical size for real devices 7181549Srgrimes */ 7191827Sdg if (dp->v_type == VBLK || dp->v_type == VCHR) 7201549Srgrimes size = (size + DEV_BSIZE - 1) & ~(DEV_BSIZE - 1); 7211549Srgrimes 7225841Sdg bp = getpbuf(); 7235455Sdg kva = (vm_offset_t) bp->b_data; 7241887Sdg 7251549Srgrimes /* 7261549Srgrimes * and map the pages to be read into the kva 7271549Srgrimes */ 7281887Sdg pmap_qenter(kva, m, count); 7291549Srgrimes 7301549Srgrimes /* build a minimal buffer header */ 7311549Srgrimes bp->b_flags = B_BUSY | B_READ | B_CALL; 7321549Srgrimes bp->b_iodone = vnode_pager_iodone; 7331549Srgrimes /* B_PHYS is not set, but it is nice to fill this in */ 7341549Srgrimes bp->b_proc = curproc; 7351549Srgrimes bp->b_rcred = bp->b_wcred = bp->b_proc->p_ucred; 7361827Sdg if (bp->b_rcred != NOCRED) 7371549Srgrimes crhold(bp->b_rcred); 7381827Sdg if (bp->b_wcred != NOCRED) 7391549Srgrimes crhold(bp->b_wcred); 7406626Sdg bp->b_blkno = firstaddr; 7415455Sdg pbgetvp(dp, bp); 7421549Srgrimes bp->b_bcount = size; 7431549Srgrimes bp->b_bufsize = size; 7441549Srgrimes 7453612Sdg cnt.v_vnodein++; 7463612Sdg cnt.v_vnodepgsin += count; 7473612Sdg 7481549Srgrimes /* do the input */ 7491549Srgrimes VOP_STRATEGY(bp); 7503612Sdg 7511549Srgrimes s = splbio(); 7521549Srgrimes /* we definitely need to be at splbio here */ 7531549Srgrimes 7541549Srgrimes while ((bp->b_flags & B_DONE) == 0) { 7559356Sdg tsleep(bp, PVM, "vnread", 0); 7561549Srgrimes } 7571549Srgrimes splx(s); 7581549Srgrimes if ((bp->b_flags & B_ERROR) != 0) 7591549Srgrimes error = EIO; 7601549Srgrimes 7611549Srgrimes if (!error) { 7621549Srgrimes if (size != count * PAGE_SIZE) 7631827Sdg bzero((caddr_t) kva + size, PAGE_SIZE * count - size); 7641549Srgrimes } 7655455Sdg pmap_qremove(kva, count); 7661549Srgrimes 7671549Srgrimes /* 7681549Srgrimes * free the buffer header back to the swap buffer pool 7691549Srgrimes */ 7701549Srgrimes relpbuf(bp); 7711549Srgrimes 7721549Srgrimes for (i = 0; i < count; i++) { 7732386Sdg pmap_clear_modify(VM_PAGE_TO_PHYS(m[i])); 7745455Sdg m[i]->dirty = 0; 7755455Sdg m[i]->valid = VM_PAGE_BITS_ALL; 77610669Sdyson m[i]->flags &= ~PG_ZERO; 7771549Srgrimes if (i != reqpage) { 7781827Sdg 7791549Srgrimes /* 7801827Sdg * whether or not to leave the page activated is up in 7811827Sdg * the air, but we should put the page on a page queue 7821827Sdg * somewhere. (it already is in the object). Result: 7831827Sdg * It appears that emperical results show that 7841827Sdg * deactivating pages is best. 7851549Srgrimes */ 7861827Sdg 7871549Srgrimes /* 7881827Sdg * just in case someone was asking for this page we 7891827Sdg * now tell them that it is ok to use 7901549Srgrimes */ 7911549Srgrimes if (!error) { 7925841Sdg vm_page_deactivate(m[i]); 7931549Srgrimes PAGE_WAKEUP(m[i]); 7941549Srgrimes } else { 7951549Srgrimes vnode_pager_freepage(m[i]); 7961549Srgrimes } 7971549Srgrimes } 7981549Srgrimes } 7991549Srgrimes if (error) { 8009507Sdg printf("vnode_pager_getpages: I/O read error\n"); 8011549Srgrimes } 8024207Sdg return (error ? VM_PAGER_ERROR : VM_PAGER_OK); 8031549Srgrimes} 8041549Srgrimes 80510556Sdysonint 80610556Sdysonvnode_pager_putpages(object, m, count, sync, rtvals) 80710556Sdyson vm_object_t object; 80810556Sdyson vm_page_t *m; 80910556Sdyson int count; 81010556Sdyson boolean_t sync; 81110556Sdyson int *rtvals; 81210556Sdyson{ 81310556Sdyson int rtval; 81410556Sdyson struct vnode *vp; 81510556Sdyson vp = object->handle; 81611701Sdyson rtval = VOP_PUTPAGES(vp, m, count*PAGE_SIZE, sync, rtvals, 0); 81710556Sdyson if (rtval == EOPNOTSUPP) 81811943Sbde return vnode_pager_leaf_putpages(object, m, count, sync, rtvals); 81910556Sdyson else 82010556Sdyson return rtval; 82110556Sdyson} 82210556Sdyson 8231549Srgrimes/* 8241549Srgrimes * generic vnode pager output routine 8251549Srgrimes */ 82610556Sdysonstatic int 82710556Sdysonvnode_pager_leaf_putpages(object, m, count, sync, rtvals) 8289507Sdg vm_object_t object; 8291549Srgrimes vm_page_t *m; 8305455Sdg int count; 8319507Sdg boolean_t sync; 8325455Sdg int *rtvals; 8331549Srgrimes{ 8347695Sdg int i; 8351549Srgrimes 8367695Sdg struct vnode *vp; 8377695Sdg int maxsize, ncount; 8387695Sdg struct uio auio; 8397695Sdg struct iovec aiov; 8407695Sdg int error; 8411549Srgrimes 8429507Sdg vp = object->handle;; 8431827Sdg for (i = 0; i < count; i++) 8441549Srgrimes rtvals[i] = VM_PAGER_AGAIN; 8451549Srgrimes 8465455Sdg if ((int) m[0]->offset < 0) { 8479507Sdg printf("vnode_pager_putpages: attempt to write meta-data!!! -- 0x%x(%x)\n", m[0]->offset, m[0]->dirty); 8487695Sdg rtvals[0] = VM_PAGER_BAD; 8497695Sdg return VM_PAGER_BAD; 8505455Sdg } 8517178Sdg 8527695Sdg maxsize = count * PAGE_SIZE; 8537695Sdg ncount = count; 8541549Srgrimes 8559507Sdg if (maxsize + m[0]->offset > object->un_pager.vnp.vnp_size) { 8569507Sdg if (object->un_pager.vnp.vnp_size > m[0]->offset) 8579507Sdg maxsize = object->un_pager.vnp.vnp_size - m[0]->offset; 8588585Sdg else 8598585Sdg maxsize = 0; 8607695Sdg ncount = (maxsize + PAGE_SIZE - 1) / PAGE_SIZE; 8618585Sdg if (ncount < count) { 8628585Sdg for (i = ncount; i < count; i++) { 8637695Sdg rtvals[i] = VM_PAGER_BAD; 8641549Srgrimes } 8658585Sdg if (ncount == 0) { 86612423Sphk printf("vnode_pager_putpages: write past end of file: %ld, %ld\n", 86712423Sphk m[0]->offset, 86812423Sphk object->un_pager.vnp.vnp_size); 8697695Sdg return rtvals[0]; 8707695Sdg } 8711549Srgrimes } 8721541Srgrimes } 8737695Sdg 8748585Sdg for (i = 0; i < count; i++) { 8758585Sdg m[i]->busy++; 8767695Sdg m[i]->flags &= ~PG_BUSY; 8771549Srgrimes } 8781827Sdg 8797695Sdg aiov.iov_base = (caddr_t) 0; 8807695Sdg aiov.iov_len = maxsize; 8817695Sdg auio.uio_iov = &aiov; 8827695Sdg auio.uio_iovcnt = 1; 8837695Sdg auio.uio_offset = m[0]->offset; 8847695Sdg auio.uio_segflg = UIO_NOCOPY; 8857695Sdg auio.uio_rw = UIO_WRITE; 8867695Sdg auio.uio_resid = maxsize; 8877695Sdg auio.uio_procp = (struct proc *) 0; 8887695Sdg error = VOP_WRITE(vp, &auio, IO_VMIO, curproc->p_ucred); 8893612Sdg cnt.v_vnodeout++; 8907695Sdg cnt.v_vnodepgsout += ncount; 8913612Sdg 8928585Sdg if (error) { 8939507Sdg printf("vnode_pager_putpages: I/O error %d\n", error); 8947695Sdg } 8958585Sdg if (auio.uio_resid) { 89612423Sphk printf("vnode_pager_putpages: residual I/O %d at %ld\n", 89712423Sphk auio.uio_resid, m[0]->offset); 8987695Sdg } 8998585Sdg for (i = 0; i < count; i++) { 9008585Sdg m[i]->busy--; 9018585Sdg if (i < ncount) { 9027695Sdg rtvals[i] = VM_PAGER_OK; 9037695Sdg } 9048585Sdg if ((m[i]->busy == 0) && (m[i]->flags & PG_WANTED)) 9059507Sdg wakeup(m[i]); 9067695Sdg } 9077695Sdg return rtvals[0]; 9087695Sdg} 9091549Srgrimes 9107695Sdgstruct vnode * 9119507Sdgvnode_pager_lock(object) 9129507Sdg vm_object_t object; 9139507Sdg{ 9149507Sdg for (; object != NULL; object = object->backing_object) { 9159507Sdg if (object->type != OBJT_VNODE) 9167695Sdg continue; 9171549Srgrimes 9189507Sdg VOP_LOCK(object->handle); 9199507Sdg return object->handle; 9201549Srgrimes } 9219507Sdg return NULL; 9227695Sdg} 923