The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/vm/vnode_pager.c

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    1 /*-
    2  * Copyright (c) 1990 University of Utah.
    3  * Copyright (c) 1991 The Regents of the University of California.
    4  * All rights reserved.
    5  * Copyright (c) 1993, 1994 John S. Dyson
    6  * Copyright (c) 1995, David Greenman
    7  *
    8  * This code is derived from software contributed to Berkeley by
    9  * the Systems Programming Group of the University of Utah Computer
   10  * Science Department.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. All advertising materials mentioning features or use of this software
   21  *    must display the following acknowledgement:
   22  *      This product includes software developed by the University of
   23  *      California, Berkeley and its contributors.
   24  * 4. Neither the name of the University nor the names of its contributors
   25  *    may be used to endorse or promote products derived from this software
   26  *    without specific prior written permission.
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   38  * SUCH DAMAGE.
   39  *
   40  *      from: @(#)vnode_pager.c 7.5 (Berkeley) 4/20/91
   41  */
   42 
   43 /*
   44  * Page to/from files (vnodes).
   45  */
   46 
   47 /*
   48  * TODO:
   49  *      Implement VOP_GETPAGES/PUTPAGES interface for filesystems. Will
   50  *      greatly re-simplify the vnode_pager.
   51  */
   52 
   53 #include <sys/cdefs.h>
   54 __FBSDID("$FreeBSD: releng/9.0/sys/vm/vnode_pager.c 225418 2011-09-06 10:30:11Z kib $");
   55 
   56 #include <sys/param.h>
   57 #include <sys/systm.h>
   58 #include <sys/proc.h>
   59 #include <sys/vnode.h>
   60 #include <sys/mount.h>
   61 #include <sys/bio.h>
   62 #include <sys/buf.h>
   63 #include <sys/vmmeter.h>
   64 #include <sys/limits.h>
   65 #include <sys/conf.h>
   66 #include <sys/sf_buf.h>
   67 
   68 #include <machine/atomic.h>
   69 
   70 #include <vm/vm.h>
   71 #include <vm/vm_object.h>
   72 #include <vm/vm_page.h>
   73 #include <vm/vm_pager.h>
   74 #include <vm/vm_map.h>
   75 #include <vm/vnode_pager.h>
   76 #include <vm/vm_extern.h>
   77 
   78 static int vnode_pager_addr(struct vnode *vp, vm_ooffset_t address,
   79     daddr_t *rtaddress, int *run);
   80 static int vnode_pager_input_smlfs(vm_object_t object, vm_page_t m);
   81 static int vnode_pager_input_old(vm_object_t object, vm_page_t m);
   82 static void vnode_pager_dealloc(vm_object_t);
   83 static int vnode_pager_getpages(vm_object_t, vm_page_t *, int, int);
   84 static void vnode_pager_putpages(vm_object_t, vm_page_t *, int, boolean_t, int *);
   85 static boolean_t vnode_pager_haspage(vm_object_t, vm_pindex_t, int *, int *);
   86 static vm_object_t vnode_pager_alloc(void *, vm_ooffset_t, vm_prot_t,
   87     vm_ooffset_t, struct ucred *cred);
   88 
   89 struct pagerops vnodepagerops = {
   90         .pgo_alloc =    vnode_pager_alloc,
   91         .pgo_dealloc =  vnode_pager_dealloc,
   92         .pgo_getpages = vnode_pager_getpages,
   93         .pgo_putpages = vnode_pager_putpages,
   94         .pgo_haspage =  vnode_pager_haspage,
   95 };
   96 
   97 int vnode_pbuf_freecnt;
   98 
   99 /* Create the VM system backing object for this vnode */
  100 int
  101 vnode_create_vobject(struct vnode *vp, off_t isize, struct thread *td)
  102 {
  103         vm_object_t object;
  104         vm_ooffset_t size = isize;
  105         struct vattr va;
  106 
  107         if (!vn_isdisk(vp, NULL) && vn_canvmio(vp) == FALSE)
  108                 return (0);
  109 
  110         while ((object = vp->v_object) != NULL) {
  111                 VM_OBJECT_LOCK(object);
  112                 if (!(object->flags & OBJ_DEAD)) {
  113                         VM_OBJECT_UNLOCK(object);
  114                         return (0);
  115                 }
  116                 VOP_UNLOCK(vp, 0);
  117                 vm_object_set_flag(object, OBJ_DISCONNECTWNT);
  118                 msleep(object, VM_OBJECT_MTX(object), PDROP | PVM, "vodead", 0);
  119                 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
  120         }
  121 
  122         if (size == 0) {
  123                 if (vn_isdisk(vp, NULL)) {
  124                         size = IDX_TO_OFF(INT_MAX);
  125                 } else {
  126                         if (VOP_GETATTR(vp, &va, td->td_ucred))
  127                                 return (0);
  128                         size = va.va_size;
  129                 }
  130         }
  131 
  132         object = vnode_pager_alloc(vp, size, 0, 0, td->td_ucred);
  133         /*
  134          * Dereference the reference we just created.  This assumes
  135          * that the object is associated with the vp.
  136          */
  137         VM_OBJECT_LOCK(object);
  138         object->ref_count--;
  139         VM_OBJECT_UNLOCK(object);
  140         vrele(vp);
  141 
  142         KASSERT(vp->v_object != NULL, ("vnode_create_vobject: NULL object"));
  143 
  144         return (0);
  145 }
  146 
  147 void
  148 vnode_destroy_vobject(struct vnode *vp)
  149 {
  150         struct vm_object *obj;
  151 
  152         obj = vp->v_object;
  153         if (obj == NULL)
  154                 return;
  155         ASSERT_VOP_ELOCKED(vp, "vnode_destroy_vobject");
  156         VM_OBJECT_LOCK(obj);
  157         if (obj->ref_count == 0) {
  158                 /*
  159                  * vclean() may be called twice. The first time
  160                  * removes the primary reference to the object,
  161                  * the second time goes one further and is a
  162                  * special-case to terminate the object.
  163                  *
  164                  * don't double-terminate the object
  165                  */
  166                 if ((obj->flags & OBJ_DEAD) == 0)
  167                         vm_object_terminate(obj);
  168                 else
  169                         VM_OBJECT_UNLOCK(obj);
  170         } else {
  171                 /*
  172                  * Woe to the process that tries to page now :-).
  173                  */
  174                 vm_pager_deallocate(obj);
  175                 VM_OBJECT_UNLOCK(obj);
  176         }
  177         vp->v_object = NULL;
  178 }
  179 
  180 
  181 /*
  182  * Allocate (or lookup) pager for a vnode.
  183  * Handle is a vnode pointer.
  184  *
  185  * MPSAFE
  186  */
  187 vm_object_t
  188 vnode_pager_alloc(void *handle, vm_ooffset_t size, vm_prot_t prot,
  189     vm_ooffset_t offset, struct ucred *cred)
  190 {
  191         vm_object_t object;
  192         struct vnode *vp;
  193 
  194         /*
  195          * Pageout to vnode, no can do yet.
  196          */
  197         if (handle == NULL)
  198                 return (NULL);
  199 
  200         vp = (struct vnode *) handle;
  201 
  202         /*
  203          * If the object is being terminated, wait for it to
  204          * go away.
  205          */
  206 retry:
  207         while ((object = vp->v_object) != NULL) {
  208                 VM_OBJECT_LOCK(object);
  209                 if ((object->flags & OBJ_DEAD) == 0)
  210                         break;
  211                 vm_object_set_flag(object, OBJ_DISCONNECTWNT);
  212                 msleep(object, VM_OBJECT_MTX(object), PDROP | PVM, "vadead", 0);
  213         }
  214 
  215         if (vp->v_usecount == 0)
  216                 panic("vnode_pager_alloc: no vnode reference");
  217 
  218         if (object == NULL) {
  219                 /*
  220                  * Add an object of the appropriate size
  221                  */
  222                 object = vm_object_allocate(OBJT_VNODE, OFF_TO_IDX(round_page(size)));
  223 
  224                 object->un_pager.vnp.vnp_size = size;
  225 
  226                 object->handle = handle;
  227                 VI_LOCK(vp);
  228                 if (vp->v_object != NULL) {
  229                         /*
  230                          * Object has been created while we were sleeping
  231                          */
  232                         VI_UNLOCK(vp);
  233                         vm_object_destroy(object);
  234                         goto retry;
  235                 }
  236                 vp->v_object = object;
  237                 VI_UNLOCK(vp);
  238         } else {
  239                 object->ref_count++;
  240                 VM_OBJECT_UNLOCK(object);
  241         }
  242         vref(vp);
  243         return (object);
  244 }
  245 
  246 /*
  247  *      The object must be locked.
  248  */
  249 static void
  250 vnode_pager_dealloc(object)
  251         vm_object_t object;
  252 {
  253         struct vnode *vp;
  254         int refs;
  255 
  256         vp = object->handle;
  257         if (vp == NULL)
  258                 panic("vnode_pager_dealloc: pager already dealloced");
  259 
  260         VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
  261         vm_object_pip_wait(object, "vnpdea");
  262         refs = object->ref_count;
  263 
  264         object->handle = NULL;
  265         object->type = OBJT_DEAD;
  266         if (object->flags & OBJ_DISCONNECTWNT) {
  267                 vm_object_clear_flag(object, OBJ_DISCONNECTWNT);
  268                 wakeup(object);
  269         }
  270         ASSERT_VOP_ELOCKED(vp, "vnode_pager_dealloc");
  271         vp->v_object = NULL;
  272         vp->v_vflag &= ~VV_TEXT;
  273         while (refs-- > 0)
  274                 vunref(vp);
  275 }
  276 
  277 static boolean_t
  278 vnode_pager_haspage(object, pindex, before, after)
  279         vm_object_t object;
  280         vm_pindex_t pindex;
  281         int *before;
  282         int *after;
  283 {
  284         struct vnode *vp = object->handle;
  285         daddr_t bn;
  286         int err;
  287         daddr_t reqblock;
  288         int poff;
  289         int bsize;
  290         int pagesperblock, blocksperpage;
  291         int vfslocked;
  292 
  293         VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
  294         /*
  295          * If no vp or vp is doomed or marked transparent to VM, we do not
  296          * have the page.
  297          */
  298         if (vp == NULL || vp->v_iflag & VI_DOOMED)
  299                 return FALSE;
  300         /*
  301          * If the offset is beyond end of file we do
  302          * not have the page.
  303          */
  304         if (IDX_TO_OFF(pindex) >= object->un_pager.vnp.vnp_size)
  305                 return FALSE;
  306 
  307         bsize = vp->v_mount->mnt_stat.f_iosize;
  308         pagesperblock = bsize / PAGE_SIZE;
  309         blocksperpage = 0;
  310         if (pagesperblock > 0) {
  311                 reqblock = pindex / pagesperblock;
  312         } else {
  313                 blocksperpage = (PAGE_SIZE / bsize);
  314                 reqblock = pindex * blocksperpage;
  315         }
  316         VM_OBJECT_UNLOCK(object);
  317         vfslocked = VFS_LOCK_GIANT(vp->v_mount);
  318         err = VOP_BMAP(vp, reqblock, NULL, &bn, after, before);
  319         VFS_UNLOCK_GIANT(vfslocked);
  320         VM_OBJECT_LOCK(object);
  321         if (err)
  322                 return TRUE;
  323         if (bn == -1)
  324                 return FALSE;
  325         if (pagesperblock > 0) {
  326                 poff = pindex - (reqblock * pagesperblock);
  327                 if (before) {
  328                         *before *= pagesperblock;
  329                         *before += poff;
  330                 }
  331                 if (after) {
  332                         int numafter;
  333                         *after *= pagesperblock;
  334                         numafter = pagesperblock - (poff + 1);
  335                         if (IDX_TO_OFF(pindex + numafter) >
  336                             object->un_pager.vnp.vnp_size) {
  337                                 numafter =
  338                                     OFF_TO_IDX(object->un_pager.vnp.vnp_size) -
  339                                     pindex;
  340                         }
  341                         *after += numafter;
  342                 }
  343         } else {
  344                 if (before) {
  345                         *before /= blocksperpage;
  346                 }
  347 
  348                 if (after) {
  349                         *after /= blocksperpage;
  350                 }
  351         }
  352         return TRUE;
  353 }
  354 
  355 /*
  356  * Lets the VM system know about a change in size for a file.
  357  * We adjust our own internal size and flush any cached pages in
  358  * the associated object that are affected by the size change.
  359  *
  360  * Note: this routine may be invoked as a result of a pager put
  361  * operation (possibly at object termination time), so we must be careful.
  362  */
  363 void
  364 vnode_pager_setsize(vp, nsize)
  365         struct vnode *vp;
  366         vm_ooffset_t nsize;
  367 {
  368         vm_object_t object;
  369         vm_page_t m;
  370         vm_pindex_t nobjsize;
  371 
  372         if ((object = vp->v_object) == NULL)
  373                 return;
  374 /*      ASSERT_VOP_ELOCKED(vp, "vnode_pager_setsize and not locked vnode"); */
  375         VM_OBJECT_LOCK(object);
  376         if (nsize == object->un_pager.vnp.vnp_size) {
  377                 /*
  378                  * Hasn't changed size
  379                  */
  380                 VM_OBJECT_UNLOCK(object);
  381                 return;
  382         }
  383         nobjsize = OFF_TO_IDX(nsize + PAGE_MASK);
  384         if (nsize < object->un_pager.vnp.vnp_size) {
  385                 /*
  386                  * File has shrunk. Toss any cached pages beyond the new EOF.
  387                  */
  388                 if (nobjsize < object->size)
  389                         vm_object_page_remove(object, nobjsize, object->size,
  390                             0);
  391                 /*
  392                  * this gets rid of garbage at the end of a page that is now
  393                  * only partially backed by the vnode.
  394                  *
  395                  * XXX for some reason (I don't know yet), if we take a
  396                  * completely invalid page and mark it partially valid
  397                  * it can screw up NFS reads, so we don't allow the case.
  398                  */
  399                 if ((nsize & PAGE_MASK) &&
  400                     (m = vm_page_lookup(object, OFF_TO_IDX(nsize))) != NULL &&
  401                     m->valid != 0) {
  402                         int base = (int)nsize & PAGE_MASK;
  403                         int size = PAGE_SIZE - base;
  404 
  405                         /*
  406                          * Clear out partial-page garbage in case
  407                          * the page has been mapped.
  408                          */
  409                         pmap_zero_page_area(m, base, size);
  410 
  411                         /*
  412                          * Update the valid bits to reflect the blocks that
  413                          * have been zeroed.  Some of these valid bits may
  414                          * have already been set.
  415                          */
  416                         vm_page_set_valid(m, base, size);
  417 
  418                         /*
  419                          * Round "base" to the next block boundary so that the
  420                          * dirty bit for a partially zeroed block is not
  421                          * cleared.
  422                          */
  423                         base = roundup2(base, DEV_BSIZE);
  424 
  425                         /*
  426                          * Clear out partial-page dirty bits.
  427                          *
  428                          * note that we do not clear out the valid
  429                          * bits.  This would prevent bogus_page
  430                          * replacement from working properly.
  431                          */
  432                         vm_page_clear_dirty(m, base, PAGE_SIZE - base);
  433                 } else if ((nsize & PAGE_MASK) &&
  434                     __predict_false(object->cache != NULL)) {
  435                         vm_page_cache_free(object, OFF_TO_IDX(nsize),
  436                             nobjsize);
  437                 }
  438         }
  439         object->un_pager.vnp.vnp_size = nsize;
  440         object->size = nobjsize;
  441         VM_OBJECT_UNLOCK(object);
  442 }
  443 
  444 /*
  445  * calculate the linear (byte) disk address of specified virtual
  446  * file address
  447  */
  448 static int
  449 vnode_pager_addr(struct vnode *vp, vm_ooffset_t address, daddr_t *rtaddress,
  450     int *run)
  451 {
  452         int bsize;
  453         int err;
  454         daddr_t vblock;
  455         daddr_t voffset;
  456 
  457         if (address < 0)
  458                 return -1;
  459 
  460         if (vp->v_iflag & VI_DOOMED)
  461                 return -1;
  462 
  463         bsize = vp->v_mount->mnt_stat.f_iosize;
  464         vblock = address / bsize;
  465         voffset = address % bsize;
  466 
  467         err = VOP_BMAP(vp, vblock, NULL, rtaddress, run, NULL);
  468         if (err == 0) {
  469                 if (*rtaddress != -1)
  470                         *rtaddress += voffset / DEV_BSIZE;
  471                 if (run) {
  472                         *run += 1;
  473                         *run *= bsize/PAGE_SIZE;
  474                         *run -= voffset/PAGE_SIZE;
  475                 }
  476         }
  477 
  478         return (err);
  479 }
  480 
  481 /*
  482  * small block filesystem vnode pager input
  483  */
  484 static int
  485 vnode_pager_input_smlfs(object, m)
  486         vm_object_t object;
  487         vm_page_t m;
  488 {
  489         int bits, i;
  490         struct vnode *vp;
  491         struct bufobj *bo;
  492         struct buf *bp;
  493         struct sf_buf *sf;
  494         daddr_t fileaddr;
  495         vm_offset_t bsize;
  496         int error = 0;
  497 
  498         vp = object->handle;
  499         if (vp->v_iflag & VI_DOOMED)
  500                 return VM_PAGER_BAD;
  501 
  502         bsize = vp->v_mount->mnt_stat.f_iosize;
  503 
  504         VOP_BMAP(vp, 0, &bo, 0, NULL, NULL);
  505 
  506         sf = sf_buf_alloc(m, 0);
  507 
  508         for (i = 0; i < PAGE_SIZE / bsize; i++) {
  509                 vm_ooffset_t address;
  510 
  511                 bits = vm_page_bits(i * bsize, bsize);
  512                 if (m->valid & bits)
  513                         continue;
  514 
  515                 address = IDX_TO_OFF(m->pindex) + i * bsize;
  516                 if (address >= object->un_pager.vnp.vnp_size) {
  517                         fileaddr = -1;
  518                 } else {
  519                         error = vnode_pager_addr(vp, address, &fileaddr, NULL);
  520                         if (error)
  521                                 break;
  522                 }
  523                 if (fileaddr != -1) {
  524                         bp = getpbuf(&vnode_pbuf_freecnt);
  525 
  526                         /* build a minimal buffer header */
  527                         bp->b_iocmd = BIO_READ;
  528                         bp->b_iodone = bdone;
  529                         KASSERT(bp->b_rcred == NOCRED, ("leaking read ucred"));
  530                         KASSERT(bp->b_wcred == NOCRED, ("leaking write ucred"));
  531                         bp->b_rcred = crhold(curthread->td_ucred);
  532                         bp->b_wcred = crhold(curthread->td_ucred);
  533                         bp->b_data = (caddr_t)sf_buf_kva(sf) + i * bsize;
  534                         bp->b_blkno = fileaddr;
  535                         pbgetbo(bo, bp);
  536                         bp->b_bcount = bsize;
  537                         bp->b_bufsize = bsize;
  538                         bp->b_runningbufspace = bp->b_bufsize;
  539                         atomic_add_long(&runningbufspace, bp->b_runningbufspace);
  540 
  541                         /* do the input */
  542                         bp->b_iooffset = dbtob(bp->b_blkno);
  543                         bstrategy(bp);
  544 
  545                         bwait(bp, PVM, "vnsrd");
  546 
  547                         if ((bp->b_ioflags & BIO_ERROR) != 0)
  548                                 error = EIO;
  549 
  550                         /*
  551                          * free the buffer header back to the swap buffer pool
  552                          */
  553                         pbrelbo(bp);
  554                         relpbuf(bp, &vnode_pbuf_freecnt);
  555                         if (error)
  556                                 break;
  557                 } else
  558                         bzero((caddr_t)sf_buf_kva(sf) + i * bsize, bsize);
  559                 KASSERT((m->dirty & bits) == 0,
  560                     ("vnode_pager_input_smlfs: page %p is dirty", m));
  561                 VM_OBJECT_LOCK(object);
  562                 m->valid |= bits;
  563                 VM_OBJECT_UNLOCK(object);
  564         }
  565         sf_buf_free(sf);
  566         if (error) {
  567                 return VM_PAGER_ERROR;
  568         }
  569         return VM_PAGER_OK;
  570 }
  571 
  572 /*
  573  * old style vnode pager input routine
  574  */
  575 static int
  576 vnode_pager_input_old(object, m)
  577         vm_object_t object;
  578         vm_page_t m;
  579 {
  580         struct uio auio;
  581         struct iovec aiov;
  582         int error;
  583         int size;
  584         struct sf_buf *sf;
  585         struct vnode *vp;
  586 
  587         VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
  588         error = 0;
  589 
  590         /*
  591          * Return failure if beyond current EOF
  592          */
  593         if (IDX_TO_OFF(m->pindex) >= object->un_pager.vnp.vnp_size) {
  594                 return VM_PAGER_BAD;
  595         } else {
  596                 size = PAGE_SIZE;
  597                 if (IDX_TO_OFF(m->pindex) + size > object->un_pager.vnp.vnp_size)
  598                         size = object->un_pager.vnp.vnp_size - IDX_TO_OFF(m->pindex);
  599                 vp = object->handle;
  600                 VM_OBJECT_UNLOCK(object);
  601 
  602                 /*
  603                  * Allocate a kernel virtual address and initialize so that
  604                  * we can use VOP_READ/WRITE routines.
  605                  */
  606                 sf = sf_buf_alloc(m, 0);
  607 
  608                 aiov.iov_base = (caddr_t)sf_buf_kva(sf);
  609                 aiov.iov_len = size;
  610                 auio.uio_iov = &aiov;
  611                 auio.uio_iovcnt = 1;
  612                 auio.uio_offset = IDX_TO_OFF(m->pindex);
  613                 auio.uio_segflg = UIO_SYSSPACE;
  614                 auio.uio_rw = UIO_READ;
  615                 auio.uio_resid = size;
  616                 auio.uio_td = curthread;
  617 
  618                 error = VOP_READ(vp, &auio, 0, curthread->td_ucred);
  619                 if (!error) {
  620                         int count = size - auio.uio_resid;
  621 
  622                         if (count == 0)
  623                                 error = EINVAL;
  624                         else if (count != PAGE_SIZE)
  625                                 bzero((caddr_t)sf_buf_kva(sf) + count,
  626                                     PAGE_SIZE - count);
  627                 }
  628                 sf_buf_free(sf);
  629 
  630                 VM_OBJECT_LOCK(object);
  631         }
  632         KASSERT(m->dirty == 0, ("vnode_pager_input_old: page %p is dirty", m));
  633         if (!error)
  634                 m->valid = VM_PAGE_BITS_ALL;
  635         return error ? VM_PAGER_ERROR : VM_PAGER_OK;
  636 }
  637 
  638 /*
  639  * generic vnode pager input routine
  640  */
  641 
  642 /*
  643  * Local media VFS's that do not implement their own VOP_GETPAGES
  644  * should have their VOP_GETPAGES call to vnode_pager_generic_getpages()
  645  * to implement the previous behaviour.
  646  *
  647  * All other FS's should use the bypass to get to the local media
  648  * backing vp's VOP_GETPAGES.
  649  */
  650 static int
  651 vnode_pager_getpages(object, m, count, reqpage)
  652         vm_object_t object;
  653         vm_page_t *m;
  654         int count;
  655         int reqpage;
  656 {
  657         int rtval;
  658         struct vnode *vp;
  659         int bytes = count * PAGE_SIZE;
  660         int vfslocked;
  661 
  662         vp = object->handle;
  663         VM_OBJECT_UNLOCK(object);
  664         vfslocked = VFS_LOCK_GIANT(vp->v_mount);
  665         rtval = VOP_GETPAGES(vp, m, bytes, reqpage, 0);
  666         KASSERT(rtval != EOPNOTSUPP,
  667             ("vnode_pager: FS getpages not implemented\n"));
  668         VFS_UNLOCK_GIANT(vfslocked);
  669         VM_OBJECT_LOCK(object);
  670         return rtval;
  671 }
  672 
  673 /*
  674  * This is now called from local media FS's to operate against their
  675  * own vnodes if they fail to implement VOP_GETPAGES.
  676  */
  677 int
  678 vnode_pager_generic_getpages(vp, m, bytecount, reqpage)
  679         struct vnode *vp;
  680         vm_page_t *m;
  681         int bytecount;
  682         int reqpage;
  683 {
  684         vm_object_t object;
  685         vm_offset_t kva;
  686         off_t foff, tfoff, nextoff;
  687         int i, j, size, bsize, first;
  688         daddr_t firstaddr, reqblock;
  689         struct bufobj *bo;
  690         int runpg;
  691         int runend;
  692         struct buf *bp;
  693         int count;
  694         int error;
  695 
  696         object = vp->v_object;
  697         count = bytecount / PAGE_SIZE;
  698 
  699         KASSERT(vp->v_type != VCHR && vp->v_type != VBLK,
  700             ("vnode_pager_generic_getpages does not support devices"));
  701         if (vp->v_iflag & VI_DOOMED)
  702                 return VM_PAGER_BAD;
  703 
  704         bsize = vp->v_mount->mnt_stat.f_iosize;
  705 
  706         /* get the UNDERLYING device for the file with VOP_BMAP() */
  707 
  708         /*
  709          * originally, we did not check for an error return value -- assuming
  710          * an fs always has a bmap entry point -- that assumption is wrong!!!
  711          */
  712         foff = IDX_TO_OFF(m[reqpage]->pindex);
  713 
  714         /*
  715          * if we can't bmap, use old VOP code
  716          */
  717         error = VOP_BMAP(vp, foff / bsize, &bo, &reqblock, NULL, NULL);
  718         if (error == EOPNOTSUPP) {
  719                 VM_OBJECT_LOCK(object);
  720                 
  721                 for (i = 0; i < count; i++)
  722                         if (i != reqpage) {
  723                                 vm_page_lock(m[i]);
  724                                 vm_page_free(m[i]);
  725                                 vm_page_unlock(m[i]);
  726                         }
  727                 PCPU_INC(cnt.v_vnodein);
  728                 PCPU_INC(cnt.v_vnodepgsin);
  729                 error = vnode_pager_input_old(object, m[reqpage]);
  730                 VM_OBJECT_UNLOCK(object);
  731                 return (error);
  732         } else if (error != 0) {
  733                 VM_OBJECT_LOCK(object);
  734                 for (i = 0; i < count; i++)
  735                         if (i != reqpage) {
  736                                 vm_page_lock(m[i]);
  737                                 vm_page_free(m[i]);
  738                                 vm_page_unlock(m[i]);
  739                         }
  740                 VM_OBJECT_UNLOCK(object);
  741                 return (VM_PAGER_ERROR);
  742 
  743                 /*
  744                  * if the blocksize is smaller than a page size, then use
  745                  * special small filesystem code.  NFS sometimes has a small
  746                  * blocksize, but it can handle large reads itself.
  747                  */
  748         } else if ((PAGE_SIZE / bsize) > 1 &&
  749             (vp->v_mount->mnt_stat.f_type != nfs_mount_type)) {
  750                 VM_OBJECT_LOCK(object);
  751                 for (i = 0; i < count; i++)
  752                         if (i != reqpage) {
  753                                 vm_page_lock(m[i]);
  754                                 vm_page_free(m[i]);
  755                                 vm_page_unlock(m[i]);
  756                         }
  757                 VM_OBJECT_UNLOCK(object);
  758                 PCPU_INC(cnt.v_vnodein);
  759                 PCPU_INC(cnt.v_vnodepgsin);
  760                 return vnode_pager_input_smlfs(object, m[reqpage]);
  761         }
  762 
  763         /*
  764          * If we have a completely valid page available to us, we can
  765          * clean up and return.  Otherwise we have to re-read the
  766          * media.
  767          */
  768         VM_OBJECT_LOCK(object);
  769         if (m[reqpage]->valid == VM_PAGE_BITS_ALL) {
  770                 for (i = 0; i < count; i++)
  771                         if (i != reqpage) {
  772                                 vm_page_lock(m[i]);
  773                                 vm_page_free(m[i]);
  774                                 vm_page_unlock(m[i]);
  775                         }
  776                 VM_OBJECT_UNLOCK(object);
  777                 return VM_PAGER_OK;
  778         } else if (reqblock == -1) {
  779                 pmap_zero_page(m[reqpage]);
  780                 KASSERT(m[reqpage]->dirty == 0,
  781                     ("vnode_pager_generic_getpages: page %p is dirty", m));
  782                 m[reqpage]->valid = VM_PAGE_BITS_ALL;
  783                 for (i = 0; i < count; i++)
  784                         if (i != reqpage) {
  785                                 vm_page_lock(m[i]);
  786                                 vm_page_free(m[i]);
  787                                 vm_page_unlock(m[i]);
  788                         }
  789                 VM_OBJECT_UNLOCK(object);
  790                 return (VM_PAGER_OK);
  791         }
  792         m[reqpage]->valid = 0;
  793         VM_OBJECT_UNLOCK(object);
  794 
  795         /*
  796          * here on direct device I/O
  797          */
  798         firstaddr = -1;
  799 
  800         /*
  801          * calculate the run that includes the required page
  802          */
  803         for (first = 0, i = 0; i < count; i = runend) {
  804                 if (vnode_pager_addr(vp, IDX_TO_OFF(m[i]->pindex), &firstaddr,
  805                     &runpg) != 0) {
  806                         VM_OBJECT_LOCK(object);
  807                         for (; i < count; i++)
  808                                 if (i != reqpage) {
  809                                         vm_page_lock(m[i]);
  810                                         vm_page_free(m[i]);
  811                                         vm_page_unlock(m[i]);
  812                                 }
  813                         VM_OBJECT_UNLOCK(object);
  814                         return (VM_PAGER_ERROR);
  815                 }
  816                 if (firstaddr == -1) {
  817                         VM_OBJECT_LOCK(object);
  818                         if (i == reqpage && foff < object->un_pager.vnp.vnp_size) {
  819                                 panic("vnode_pager_getpages: unexpected missing page: firstaddr: %jd, foff: 0x%jx%08jx, vnp_size: 0x%jx%08jx",
  820                                     (intmax_t)firstaddr, (uintmax_t)(foff >> 32),
  821                                     (uintmax_t)foff,
  822                                     (uintmax_t)
  823                                     (object->un_pager.vnp.vnp_size >> 32),
  824                                     (uintmax_t)object->un_pager.vnp.vnp_size);
  825                         }
  826                         vm_page_lock(m[i]);
  827                         vm_page_free(m[i]);
  828                         vm_page_unlock(m[i]);
  829                         VM_OBJECT_UNLOCK(object);
  830                         runend = i + 1;
  831                         first = runend;
  832                         continue;
  833                 }
  834                 runend = i + runpg;
  835                 if (runend <= reqpage) {
  836                         VM_OBJECT_LOCK(object);
  837                         for (j = i; j < runend; j++) {
  838                                 vm_page_lock(m[j]);
  839                                 vm_page_free(m[j]);
  840                                 vm_page_unlock(m[j]);
  841                         }
  842                         VM_OBJECT_UNLOCK(object);
  843                 } else {
  844                         if (runpg < (count - first)) {
  845                                 VM_OBJECT_LOCK(object);
  846                                 for (i = first + runpg; i < count; i++) {
  847                                         vm_page_lock(m[i]);
  848                                         vm_page_free(m[i]);
  849                                         vm_page_unlock(m[i]);
  850                                 }
  851                                 VM_OBJECT_UNLOCK(object);
  852                                 count = first + runpg;
  853                         }
  854                         break;
  855                 }
  856                 first = runend;
  857         }
  858 
  859         /*
  860          * the first and last page have been calculated now, move input pages
  861          * to be zero based...
  862          */
  863         if (first != 0) {
  864                 m += first;
  865                 count -= first;
  866                 reqpage -= first;
  867         }
  868 
  869         /*
  870          * calculate the file virtual address for the transfer
  871          */
  872         foff = IDX_TO_OFF(m[0]->pindex);
  873 
  874         /*
  875          * calculate the size of the transfer
  876          */
  877         size = count * PAGE_SIZE;
  878         KASSERT(count > 0, ("zero count"));
  879         if ((foff + size) > object->un_pager.vnp.vnp_size)
  880                 size = object->un_pager.vnp.vnp_size - foff;
  881         KASSERT(size > 0, ("zero size"));
  882 
  883         /*
  884          * round up physical size for real devices.
  885          */
  886         if (1) {
  887                 int secmask = bo->bo_bsize - 1;
  888                 KASSERT(secmask < PAGE_SIZE && secmask > 0,
  889                     ("vnode_pager_generic_getpages: sector size %d too large",
  890                     secmask + 1));
  891                 size = (size + secmask) & ~secmask;
  892         }
  893 
  894         bp = getpbuf(&vnode_pbuf_freecnt);
  895         kva = (vm_offset_t) bp->b_data;
  896 
  897         /*
  898          * and map the pages to be read into the kva
  899          */
  900         pmap_qenter(kva, m, count);
  901 
  902         /* build a minimal buffer header */
  903         bp->b_iocmd = BIO_READ;
  904         bp->b_iodone = bdone;
  905         KASSERT(bp->b_rcred == NOCRED, ("leaking read ucred"));
  906         KASSERT(bp->b_wcred == NOCRED, ("leaking write ucred"));
  907         bp->b_rcred = crhold(curthread->td_ucred);
  908         bp->b_wcred = crhold(curthread->td_ucred);
  909         bp->b_blkno = firstaddr;
  910         pbgetbo(bo, bp);
  911         bp->b_bcount = size;
  912         bp->b_bufsize = size;
  913         bp->b_runningbufspace = bp->b_bufsize;
  914         atomic_add_long(&runningbufspace, bp->b_runningbufspace);
  915 
  916         PCPU_INC(cnt.v_vnodein);
  917         PCPU_ADD(cnt.v_vnodepgsin, count);
  918 
  919         /* do the input */
  920         bp->b_iooffset = dbtob(bp->b_blkno);
  921         bstrategy(bp);
  922 
  923         bwait(bp, PVM, "vnread");
  924 
  925         if ((bp->b_ioflags & BIO_ERROR) != 0)
  926                 error = EIO;
  927 
  928         if (!error) {
  929                 if (size != count * PAGE_SIZE)
  930                         bzero((caddr_t) kva + size, PAGE_SIZE * count - size);
  931         }
  932         pmap_qremove(kva, count);
  933 
  934         /*
  935          * free the buffer header back to the swap buffer pool
  936          */
  937         pbrelbo(bp);
  938         relpbuf(bp, &vnode_pbuf_freecnt);
  939 
  940         VM_OBJECT_LOCK(object);
  941         for (i = 0, tfoff = foff; i < count; i++, tfoff = nextoff) {
  942                 vm_page_t mt;
  943 
  944                 nextoff = tfoff + PAGE_SIZE;
  945                 mt = m[i];
  946 
  947                 if (nextoff <= object->un_pager.vnp.vnp_size) {
  948                         /*
  949                          * Read filled up entire page.
  950                          */
  951                         mt->valid = VM_PAGE_BITS_ALL;
  952                         KASSERT(mt->dirty == 0,
  953                             ("vnode_pager_generic_getpages: page %p is dirty",
  954                             mt));
  955                         KASSERT(!pmap_page_is_mapped(mt),
  956                             ("vnode_pager_generic_getpages: page %p is mapped",
  957                             mt));
  958                 } else {
  959                         /*
  960                          * Read did not fill up entire page.
  961                          *
  962                          * Currently we do not set the entire page valid,
  963                          * we just try to clear the piece that we couldn't
  964                          * read.
  965                          */
  966                         vm_page_set_valid(mt, 0,
  967                             object->un_pager.vnp.vnp_size - tfoff);
  968                         KASSERT((mt->dirty & vm_page_bits(0,
  969                             object->un_pager.vnp.vnp_size - tfoff)) == 0,
  970                             ("vnode_pager_generic_getpages: page %p is dirty",
  971                             mt));
  972                 }
  973                 
  974                 if (i != reqpage) {
  975 
  976                         /*
  977                          * whether or not to leave the page activated is up in
  978                          * the air, but we should put the page on a page queue
  979                          * somewhere. (it already is in the object). Result:
  980                          * It appears that empirical results show that
  981                          * deactivating pages is best.
  982                          */
  983 
  984                         /*
  985                          * just in case someone was asking for this page we
  986                          * now tell them that it is ok to use
  987                          */
  988                         if (!error) {
  989                                 if (mt->oflags & VPO_WANTED) {
  990                                         vm_page_lock(mt);
  991                                         vm_page_activate(mt);
  992                                         vm_page_unlock(mt);
  993                                 } else {
  994                                         vm_page_lock(mt);
  995                                         vm_page_deactivate(mt);
  996                                         vm_page_unlock(mt);
  997                                 }
  998                                 vm_page_wakeup(mt);
  999                         } else {
 1000                                 vm_page_lock(mt);
 1001                                 vm_page_free(mt);
 1002                                 vm_page_unlock(mt);
 1003                         }
 1004                 }
 1005         }
 1006         VM_OBJECT_UNLOCK(object);
 1007         if (error) {
 1008                 printf("vnode_pager_getpages: I/O read error\n");
 1009         }
 1010         return (error ? VM_PAGER_ERROR : VM_PAGER_OK);
 1011 }
 1012 
 1013 /*
 1014  * EOPNOTSUPP is no longer legal.  For local media VFS's that do not
 1015  * implement their own VOP_PUTPAGES, their VOP_PUTPAGES should call to
 1016  * vnode_pager_generic_putpages() to implement the previous behaviour.
 1017  *
 1018  * All other FS's should use the bypass to get to the local media
 1019  * backing vp's VOP_PUTPAGES.
 1020  */
 1021 static void
 1022 vnode_pager_putpages(object, m, count, sync, rtvals)
 1023         vm_object_t object;
 1024         vm_page_t *m;
 1025         int count;
 1026         boolean_t sync;
 1027         int *rtvals;
 1028 {
 1029         int rtval;
 1030         struct vnode *vp;
 1031         int bytes = count * PAGE_SIZE;
 1032 
 1033         /*
 1034          * Force synchronous operation if we are extremely low on memory
 1035          * to prevent a low-memory deadlock.  VOP operations often need to
 1036          * allocate more memory to initiate the I/O ( i.e. do a BMAP 
 1037          * operation ).  The swapper handles the case by limiting the amount
 1038          * of asynchronous I/O, but that sort of solution doesn't scale well
 1039          * for the vnode pager without a lot of work.
 1040          *
 1041          * Also, the backing vnode's iodone routine may not wake the pageout
 1042          * daemon up.  This should be probably be addressed XXX.
 1043          */
 1044 
 1045         if ((cnt.v_free_count + cnt.v_cache_count) < cnt.v_pageout_free_min)
 1046                 sync |= OBJPC_SYNC;
 1047 
 1048         /*
 1049          * Call device-specific putpages function
 1050          */
 1051         vp = object->handle;
 1052         VM_OBJECT_UNLOCK(object);
 1053         rtval = VOP_PUTPAGES(vp, m, bytes, sync, rtvals, 0);
 1054         KASSERT(rtval != EOPNOTSUPP, 
 1055             ("vnode_pager: stale FS putpages\n"));
 1056         VM_OBJECT_LOCK(object);
 1057 }
 1058 
 1059 
 1060 /*
 1061  * This is now called from local media FS's to operate against their
 1062  * own vnodes if they fail to implement VOP_PUTPAGES.
 1063  *
 1064  * This is typically called indirectly via the pageout daemon and
 1065  * clustering has already typically occured, so in general we ask the
 1066  * underlying filesystem to write the data out asynchronously rather
 1067  * then delayed.
 1068  */
 1069 int
 1070 vnode_pager_generic_putpages(struct vnode *vp, vm_page_t *ma, int bytecount,
 1071     int flags, int *rtvals)
 1072 {
 1073         int i;
 1074         vm_object_t object;
 1075         vm_page_t m;
 1076         int count;
 1077 
 1078         int maxsize, ncount;
 1079         vm_ooffset_t poffset;
 1080         struct uio auio;
 1081         struct iovec aiov;
 1082         int error;
 1083         int ioflags;
 1084         int ppscheck = 0;
 1085         static struct timeval lastfail;
 1086         static int curfail;
 1087 
 1088         object = vp->v_object;
 1089         count = bytecount / PAGE_SIZE;
 1090 
 1091         for (i = 0; i < count; i++)
 1092                 rtvals[i] = VM_PAGER_ERROR;
 1093 
 1094         if ((int64_t)ma[0]->pindex < 0) {
 1095                 printf("vnode_pager_putpages: attempt to write meta-data!!! -- 0x%lx(%lx)\n",
 1096                     (long)ma[0]->pindex, (u_long)ma[0]->dirty);
 1097                 rtvals[0] = VM_PAGER_BAD;
 1098                 return VM_PAGER_BAD;
 1099         }
 1100 
 1101         maxsize = count * PAGE_SIZE;
 1102         ncount = count;
 1103 
 1104         poffset = IDX_TO_OFF(ma[0]->pindex);
 1105 
 1106         /*
 1107          * If the page-aligned write is larger then the actual file we
 1108          * have to invalidate pages occuring beyond the file EOF.  However,
 1109          * there is an edge case where a file may not be page-aligned where
 1110          * the last page is partially invalid.  In this case the filesystem
 1111          * may not properly clear the dirty bits for the entire page (which
 1112          * could be VM_PAGE_BITS_ALL due to the page having been mmap()d).
 1113          * With the page locked we are free to fix-up the dirty bits here.
 1114          *
 1115          * We do not under any circumstances truncate the valid bits, as
 1116          * this will screw up bogus page replacement.
 1117          */
 1118         VM_OBJECT_LOCK(object);
 1119         if (maxsize + poffset > object->un_pager.vnp.vnp_size) {
 1120                 if (object->un_pager.vnp.vnp_size > poffset) {
 1121                         int pgoff;
 1122 
 1123                         maxsize = object->un_pager.vnp.vnp_size - poffset;
 1124                         ncount = btoc(maxsize);
 1125                         if ((pgoff = (int)maxsize & PAGE_MASK) != 0) {
 1126                                 /*
 1127                                  * If the object is locked and the following
 1128                                  * conditions hold, then the page's dirty
 1129                                  * field cannot be concurrently changed by a
 1130                                  * pmap operation.
 1131                                  */
 1132                                 m = ma[ncount - 1];
 1133                                 KASSERT(m->busy > 0,
 1134                 ("vnode_pager_generic_putpages: page %p is not busy", m));
 1135                                 KASSERT((m->aflags & PGA_WRITEABLE) == 0,
 1136                 ("vnode_pager_generic_putpages: page %p is not read-only", m));
 1137                                 vm_page_clear_dirty(m, pgoff, PAGE_SIZE -
 1138                                     pgoff);
 1139                         }
 1140                 } else {
 1141                         maxsize = 0;
 1142                         ncount = 0;
 1143                 }
 1144                 if (ncount < count) {
 1145                         for (i = ncount; i < count; i++) {
 1146                                 rtvals[i] = VM_PAGER_BAD;
 1147                         }
 1148                 }
 1149         }
 1150         VM_OBJECT_UNLOCK(object);
 1151 
 1152         /*
 1153          * pageouts are already clustered, use IO_ASYNC t o force a bawrite()
 1154          * rather then a bdwrite() to prevent paging I/O from saturating 
 1155          * the buffer cache.  Dummy-up the sequential heuristic to cause
 1156          * large ranges to cluster.  If neither IO_SYNC or IO_ASYNC is set,
 1157          * the system decides how to cluster.
 1158          */
 1159         ioflags = IO_VMIO;
 1160         if (flags & (VM_PAGER_PUT_SYNC | VM_PAGER_PUT_INVAL))
 1161                 ioflags |= IO_SYNC;
 1162         else if ((flags & VM_PAGER_CLUSTER_OK) == 0)
 1163                 ioflags |= IO_ASYNC;
 1164         ioflags |= (flags & VM_PAGER_PUT_INVAL) ? IO_INVAL: 0;
 1165         ioflags |= IO_SEQMAX << IO_SEQSHIFT;
 1166 
 1167         aiov.iov_base = (caddr_t) 0;
 1168         aiov.iov_len = maxsize;
 1169         auio.uio_iov = &aiov;
 1170         auio.uio_iovcnt = 1;
 1171         auio.uio_offset = poffset;
 1172         auio.uio_segflg = UIO_NOCOPY;
 1173         auio.uio_rw = UIO_WRITE;
 1174         auio.uio_resid = maxsize;
 1175         auio.uio_td = (struct thread *) 0;
 1176         error = VOP_WRITE(vp, &auio, ioflags, curthread->td_ucred);
 1177         PCPU_INC(cnt.v_vnodeout);
 1178         PCPU_ADD(cnt.v_vnodepgsout, ncount);
 1179 
 1180         if (error) {
 1181                 if ((ppscheck = ppsratecheck(&lastfail, &curfail, 1)))
 1182                         printf("vnode_pager_putpages: I/O error %d\n", error);
 1183         }
 1184         if (auio.uio_resid) {
 1185                 if (ppscheck || ppsratecheck(&lastfail, &curfail, 1))
 1186                         printf("vnode_pager_putpages: residual I/O %zd at %lu\n",
 1187                             auio.uio_resid, (u_long)ma[0]->pindex);
 1188         }
 1189         for (i = 0; i < ncount; i++) {
 1190                 rtvals[i] = VM_PAGER_OK;
 1191         }
 1192         return rtvals[0];
 1193 }
 1194 
 1195 void
 1196 vnode_pager_undirty_pages(vm_page_t *ma, int *rtvals, int written)
 1197 {
 1198         vm_object_t obj;
 1199         int i, pos;
 1200 
 1201         if (written == 0)
 1202                 return;
 1203         obj = ma[0]->object;
 1204         VM_OBJECT_LOCK(obj);
 1205         for (i = 0, pos = 0; pos < written; i++, pos += PAGE_SIZE) {
 1206                 if (pos < trunc_page(written)) {
 1207                         rtvals[i] = VM_PAGER_OK;
 1208                         vm_page_undirty(ma[i]);
 1209                 } else {
 1210                         /* Partially written page. */
 1211                         rtvals[i] = VM_PAGER_AGAIN;
 1212                         vm_page_clear_dirty(ma[i], 0, written & PAGE_MASK);
 1213                 }
 1214         }
 1215         VM_OBJECT_UNLOCK(obj);
 1216 }

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