The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/vm/vm_pager.h

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    1 /*-
    2  * Copyright (c) 1990 University of Utah.
    3  * Copyright (c) 1991, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * the Systems Programming Group of the University of Utah Computer
    8  * Science Department.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)vm_pager.h  8.4 (Berkeley) 1/12/94
   35  * $FreeBSD: releng/8.2/sys/vm/vm_pager.h 215517 2010-11-19 10:14:07Z kib $
   36  */
   37 
   38 /*
   39  * Pager routine interface definition.
   40  */
   41 
   42 #ifndef _VM_PAGER_
   43 #define _VM_PAGER_
   44 
   45 #include <sys/queue.h>
   46 
   47 TAILQ_HEAD(pagerlst, vm_object);
   48 
   49 typedef void pgo_init_t(void);
   50 typedef vm_object_t pgo_alloc_t(void *, vm_ooffset_t, vm_prot_t, vm_ooffset_t,
   51     struct ucred *);
   52 typedef void pgo_dealloc_t(vm_object_t);
   53 typedef int pgo_getpages_t(vm_object_t, vm_page_t *, int, int);
   54 typedef void pgo_putpages_t(vm_object_t, vm_page_t *, int, int, int *);
   55 typedef boolean_t pgo_haspage_t(vm_object_t, vm_pindex_t, int *, int *);
   56 typedef void pgo_pageunswapped_t(vm_page_t);
   57 
   58 struct pagerops {
   59         pgo_init_t      *pgo_init;              /* Initialize pager. */
   60         pgo_alloc_t     *pgo_alloc;             /* Allocate pager. */
   61         pgo_dealloc_t   *pgo_dealloc;           /* Disassociate. */
   62         pgo_getpages_t  *pgo_getpages;          /* Get (read) page. */
   63         pgo_putpages_t  *pgo_putpages;          /* Put (write) page. */
   64         pgo_haspage_t   *pgo_haspage;           /* Does pager have page? */
   65         pgo_pageunswapped_t *pgo_pageunswapped;
   66 };
   67 
   68 extern struct pagerops defaultpagerops;
   69 extern struct pagerops swappagerops;
   70 extern struct pagerops vnodepagerops;
   71 extern struct pagerops devicepagerops;
   72 extern struct pagerops physpagerops;
   73 extern struct pagerops sgpagerops;
   74 
   75 /*
   76  * get/put return values
   77  * OK    operation was successful
   78  * BAD   specified data was out of the accepted range
   79  * FAIL  specified data was in range, but doesn't exist
   80  * PEND  operations was initiated but not completed
   81  * ERROR error while accessing data that is in range and exists
   82  * AGAIN temporary resource shortage prevented operation from happening
   83  */
   84 #define VM_PAGER_OK     0
   85 #define VM_PAGER_BAD    1
   86 #define VM_PAGER_FAIL   2
   87 #define VM_PAGER_PEND   3
   88 #define VM_PAGER_ERROR  4
   89 #define VM_PAGER_AGAIN  5
   90 
   91 #define VM_PAGER_PUT_SYNC               0x0001
   92 #define VM_PAGER_PUT_INVAL              0x0002
   93 #define VM_PAGER_CLUSTER_OK             0x0008
   94 
   95 #ifdef _KERNEL
   96 #ifdef MALLOC_DECLARE
   97 MALLOC_DECLARE(M_VMPGDATA);
   98 #endif
   99 
  100 extern vm_map_t pager_map;
  101 extern struct pagerops *pagertab[];
  102 extern struct mtx pbuf_mtx;
  103 
  104 vm_object_t vm_pager_allocate(objtype_t, void *, vm_ooffset_t, vm_prot_t,
  105     vm_ooffset_t, struct ucred *);
  106 void vm_pager_bufferinit(void);
  107 void vm_pager_deallocate(vm_object_t);
  108 static __inline int vm_pager_get_pages(vm_object_t, vm_page_t *, int, int);
  109 static __inline boolean_t vm_pager_has_page(vm_object_t, vm_pindex_t, int *, int *);
  110 void vm_pager_init(void);
  111 vm_object_t vm_pager_object_lookup(struct pagerlst *, void *);
  112 
  113 /*
  114  *      vm_page_get_pages:
  115  *
  116  *      Retrieve pages from the VM system in order to map them into an object
  117  *      ( or into VM space somewhere ).  If the pagein was successful, we
  118  *      must fully validate it.
  119  */
  120 static __inline int
  121 vm_pager_get_pages(
  122         vm_object_t object,
  123         vm_page_t *m,
  124         int count,
  125         int reqpage
  126 ) {
  127         int r;
  128 
  129         VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
  130         r = (*pagertab[object->type]->pgo_getpages)(object, m, count, reqpage);
  131         if (r == VM_PAGER_OK && m[reqpage]->valid != VM_PAGE_BITS_ALL) {
  132                 vm_page_zero_invalid(m[reqpage], TRUE);
  133         }
  134         return (r);
  135 }
  136 
  137 static __inline void
  138 vm_pager_put_pages(
  139         vm_object_t object,
  140         vm_page_t *m,
  141         int count,
  142         int flags,
  143         int *rtvals
  144 ) {
  145 
  146         VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
  147         (*pagertab[object->type]->pgo_putpages)
  148             (object, m, count, flags, rtvals);
  149 }
  150 
  151 /*
  152  *      vm_pager_haspage
  153  *
  154  *      Check to see if an object's pager has the requested page.  The
  155  *      object's pager will also set before and after to give the caller
  156  *      some idea of the number of pages before and after the requested
  157  *      page can be I/O'd efficiently.
  158  *
  159  *      The object must be locked.
  160  */
  161 static __inline boolean_t
  162 vm_pager_has_page(
  163         vm_object_t object,
  164         vm_pindex_t offset, 
  165         int *before,
  166         int *after
  167 ) {
  168         boolean_t ret;
  169 
  170         VM_OBJECT_LOCK_ASSERT(object, MA_OWNED);
  171         ret = (*pagertab[object->type]->pgo_haspage)
  172             (object, offset, before, after);
  173         return (ret);
  174 } 
  175 
  176 /* 
  177  *      vm_pager_page_unswapped
  178  * 
  179  *      Destroy swap associated with the page.
  180  * 
  181  *      The object containing the page must be locked.
  182  *      This function may not block.
  183  *
  184  *      XXX: A much better name would be "vm_pager_page_dirtied()"
  185  *      XXX: It is not obvious if this could be profitably used by any
  186  *      XXX: pagers besides the swap_pager or if it should even be a
  187  *      XXX: generic pager_op in the first place.
  188  */
  189 static __inline void
  190 vm_pager_page_unswapped(vm_page_t m)
  191 {
  192 
  193         VM_OBJECT_LOCK_ASSERT(m->object, MA_OWNED);
  194         if (pagertab[m->object->type]->pgo_pageunswapped)
  195                 (*pagertab[m->object->type]->pgo_pageunswapped)(m);
  196 }
  197 
  198 #endif                          /* _KERNEL */
  199 #endif                          /* _VM_PAGER_ */

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