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/bsd/vm/vnode_pager.h

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    1 /*
    2  * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
    3  *
    4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
    5  * 
    6  * This file contains Original Code and/or Modifications of Original Code
    7  * as defined in and that are subject to the Apple Public Source License
    8  * Version 2.0 (the 'License'). You may not use this file except in
    9  * compliance with the License. The rights granted to you under the License
   10  * may not be used to create, or enable the creation or redistribution of,
   11  * unlawful or unlicensed copies of an Apple operating system, or to
   12  * circumvent, violate, or enable the circumvention or violation of, any
   13  * terms of an Apple operating system software license agreement.
   14  * 
   15  * Please obtain a copy of the License at
   16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
   17  * 
   18  * The Original Code and all software distributed under the License are
   19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
   20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
   21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
   22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
   23  * Please see the License for the specific language governing rights and
   24  * limitations under the License.
   25  * 
   26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
   27  */
   28 /* 
   29  * Mach Operating System
   30  * Copyright (c) 1987 Carnegie-Mellon University
   31  * All rights reserved.  The CMU software License Agreement specifies
   32  * the terms and conditions for use and redistribution.
   33  */
   34 
   35 #ifndef _VNODE_PAGER_
   36 #define _VNODE_PAGER_   1
   37 
   38 #include <mach/kern_return.h>
   39 #include <sys/types.h>
   40 #include <kern/queue.h>
   41 
   42 #ifdef  KERNEL
   43 #include <mach/boolean.h>
   44 #include <mach/memory_object_types.h>
   45 #include <mach/vm_types.h>
   46 #include <vm/vm_protos.h>
   47 #include <vm/vm_pager.h>
   48 
   49 /*
   50  *  Vstructs are the internal (to us) description of a unit of backing store.
   51  *  The are the link between memory objects and the backing store they represent.
   52  *  For the vnode pager, backing store comes in two flavors: normal files and
   53  *  swap files.
   54  *
   55  *  For objects that page to and from normal files (e.g. objects that represent
   56  *  program text segments), we maintain some simple parameters that allow us to
   57  *  access the file's contents directly through the vnode interface.
   58  *
   59  *  Data for objects without associated vnodes is maintained in the swap files.
   60  *  Each object that uses one of these as backing store has a vstruct indicating
   61  *  the swap file of preference (vs_pf) and a mapping between contiguous object
   62  *  offsets and swap file offsets (vs_pmap).  Each entry in this mapping specifies
   63  *  the pager file to use, and the offset of the page in that pager file.  These
   64  *  mapping entries are of type pfMapEntry.
   65  */
   66 
   67 /*
   68  * Pager file structure.  One per swap file.
   69  */
   70 typedef struct pager_file {
   71         queue_chain_t   pf_chain;       /* link to other paging files */
   72         struct  vnode   *pf_vp;         /* vnode of paging file */
   73         u_int           pf_count;       /* Number of vstruct using this file */
   74         u_char          *pf_bmap;       /* Map of used blocks */
   75         long            pf_npgs;        /* Size of file in pages */
   76         long            pf_pfree;       /* Number of unused pages */
   77         long            pf_lowat;       /* Low water page */
   78         long            pf_hipage;      /* Highest page allocated */
   79         long            pf_hint;        /* Lowest page unallocated */
   80         char            *pf_name;       /* Filename of this file */
   81         boolean_t       pf_prefer;
   82         int             pf_index;       /* index into the pager_file array */
   83         void *          pf_lock;        /* Lock for alloc and dealloc */
   84 } *pager_file_t;
   85 
   86 #define PAGER_FILE_NULL (pager_file_t) 0
   87 
   88 #define MAXPAGERFILES 16
   89 
   90 #define MAX_BACKING_STORE 100
   91 
   92 struct bs_map {
   93         struct vnode    *vp;   
   94         void            *bs;
   95 };
   96 extern struct bs_map  bs_port_table[];
   97 
   98 
   99 
  100 /*
  101  * Pager file data structures.
  102  */
  103 #define INDEX_NULL      0
  104 typedef struct {
  105         unsigned int index:8;   /* paging file this block is in */
  106         unsigned int offset:24; /* page number where block resides */
  107 } pf_entry;
  108 
  109 typedef enum {
  110                 IS_INODE,       /* Local disk */
  111                 IS_RNODE        /* NFS */
  112         } vpager_fstype;
  113 
  114 /*
  115  *  Basic vnode pager structure.  One per object, backing-store pair.
  116  */
  117 typedef struct vstruct {
  118         boolean_t       is_device;      /* Must be first - see vm_pager.h */
  119         pager_file_t    vs_pf;          /* Pager file this uses */
  120         pf_entry        **vs_pmap;      /* Map of pages into paging file */
  121         unsigned int
  122         /* boolean_t */ vs_swapfile:1;  /* vnode is a swapfile */
  123         short           vs_count;       /* use count */
  124         int             vs_size;        /* size of this chunk in pages*/
  125         struct vnode    *vs_vp;         /* vnode to page to */
  126 } *vnode_pager_t;
  127 
  128 #define VNODE_PAGER_NULL        ((vnode_pager_t) 0)
  129 
  130 #endif  /* KERNEL */
  131 
  132 #endif  /* _VNODE_PAGER_ */

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