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_object.h

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    1 /*
    2  * Copyright (c) 1991, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * The Mach Operating System project at Carnegie-Mellon University.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by the University of
   19  *      California, Berkeley and its contributors.
   20  * 4. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      from: @(#)vm_object.h   8.3 (Berkeley) 1/12/94
   37  *
   38  *
   39  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   40  * All rights reserved.
   41  *
   42  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
   43  *
   44  * Permission to use, copy, modify and distribute this software and
   45  * its documentation is hereby granted, provided that both the copyright
   46  * notice and this permission notice appear in all copies of the
   47  * software, derivative works or modified versions, and any portions
   48  * thereof, and that both notices appear in supporting documentation.
   49  *
   50  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   51  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   52  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   53  *
   54  * Carnegie Mellon requests users of this software to return to
   55  *
   56  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   57  *  School of Computer Science
   58  *  Carnegie Mellon University
   59  *  Pittsburgh PA 15213-3890
   60  *
   61  * any improvements or extensions that they make and grant Carnegie the
   62  * rights to redistribute these changes.
   63  *
   64  * $FreeBSD: releng/5.0/sys/vm/vm_object.h 106871 2002-11-13 19:50:06Z alc $
   65  */
   66 
   67 /*
   68  *      Virtual memory object module definitions.
   69  */
   70 
   71 #ifndef _VM_OBJECT_
   72 #define _VM_OBJECT_
   73 
   74 #include <sys/queue.h>
   75 
   76 enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_PHYS,
   77                 OBJT_DEAD };
   78 typedef u_char objtype_t;
   79 
   80 /*
   81  *      Types defined:
   82  *
   83  *      vm_object_t             Virtual memory object.
   84  *
   85  * List of locks
   86  *      (c)     const until freed
   87  *
   88  */
   89 
   90 struct vm_object {
   91         TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
   92         TAILQ_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
   93         TAILQ_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
   94         TAILQ_HEAD(, vm_page) memq;     /* list of resident pages */
   95         vm_page_t root;                 /* root of the resident page splay tree */
   96         int generation;                 /* generation ID */
   97         vm_pindex_t size;               /* Object size */
   98         int ref_count;                  /* How many refs?? */
   99         int shadow_count;               /* how many objects that this is a shadow for */
  100         int hash_rand;                  /* (c) hash table randomizer */
  101         objtype_t type;                 /* type of pager */
  102         u_short flags;                  /* see below */
  103         u_short pg_color;               /* (c) color of first page in obj */
  104         u_short paging_in_progress;     /* Paging (in or out) so don't collapse or destroy */
  105         int resident_page_count;        /* number of resident pages */
  106         struct vm_object *backing_object; /* object that I'm a shadow of */
  107         vm_ooffset_t backing_object_offset;/* Offset in backing object */
  108         TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
  109         void *handle;
  110         union {
  111                 /*
  112                  * VNode pager
  113                  *
  114                  *      vnp_size - current size of file
  115                  */
  116                 struct {
  117                         off_t vnp_size;
  118                 } vnp;
  119 
  120                 /*
  121                  * Device pager
  122                  *
  123                  *      devp_pglist - list of allocated pages
  124                  */
  125                 struct {
  126                         TAILQ_HEAD(, vm_page) devp_pglist;
  127                 } devp;
  128 
  129                 /*
  130                  * Swap pager
  131                  *
  132                  *      swp_bcount - number of swap 'swblock' metablocks, each
  133                  *                   contains up to 16 swapblk assignments.
  134                  *                   see vm/swap_pager.h
  135                  */
  136                 struct {
  137                         int swp_bcount;
  138                 } swp;
  139         } un_pager;
  140 };
  141 
  142 /*
  143  * Flags
  144  */
  145 #define OBJ_ACTIVE      0x0004          /* active objects */
  146 #define OBJ_DEAD        0x0008          /* dead objects (during rundown) */
  147 #define OBJ_NOSPLIT     0x0010          /* dont split this object */
  148 #define OBJ_PIPWNT      0x0040          /* paging in progress wanted */
  149 #define OBJ_WRITEABLE   0x0080          /* object has been made writable */
  150 #define OBJ_MIGHTBEDIRTY 0x0100         /* object might be dirty */
  151 #define OBJ_CLEANING    0x0200
  152 #define OBJ_OPT         0x1000          /* I/O optimization */
  153 #define OBJ_ONEMAPPING  0x2000          /* One USE (a single, non-forked) mapping flag */
  154 
  155 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
  156 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
  157 
  158 #ifdef  _KERNEL
  159 
  160 #define OBJPC_SYNC      0x1                     /* sync I/O */
  161 #define OBJPC_INVAL     0x2                     /* invalidate */
  162 #define OBJPC_NOSYNC    0x4                     /* skip if PG_NOSYNC */
  163 
  164 TAILQ_HEAD(object_q, vm_object);
  165 
  166 extern struct object_q vm_object_list;  /* list of allocated objects */
  167 extern struct mtx vm_object_list_mtx;   /* lock for object list and count */
  168 
  169 extern vm_object_t kernel_object;       /* the single kernel object */
  170 extern vm_object_t kmem_object;
  171 
  172 #endif                          /* _KERNEL */
  173 
  174 #ifdef _KERNEL
  175 #define vm_object_lock(object)          mtx_lock(&Giant)
  176 #define vm_object_unlock(object)        mtx_unlock(&Giant)
  177 
  178 void vm_freeze_copyopts(vm_object_t, vm_pindex_t, vm_pindex_t);
  179 
  180 void vm_object_set_flag(vm_object_t object, u_short bits);
  181 void vm_object_clear_flag(vm_object_t object, u_short bits);
  182 void vm_object_pip_add(vm_object_t object, short i);
  183 void vm_object_pip_subtract(vm_object_t object, short i);
  184 void vm_object_pip_wakeup(vm_object_t object);
  185 void vm_object_pip_wakeupn(vm_object_t object, short i);
  186 void vm_object_pip_sleep(vm_object_t object, char *waitid);
  187 void vm_object_pip_wait(vm_object_t object, char *waitid);
  188 
  189 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
  190 vm_object_t vm_object_allocate_wait (objtype_t, vm_pindex_t, int);
  191 void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t);
  192 boolean_t vm_object_coalesce (vm_object_t, vm_pindex_t, vm_size_t, vm_size_t);
  193 void vm_object_collapse (vm_object_t);
  194 void vm_object_deallocate (vm_object_t);
  195 void vm_object_terminate (vm_object_t);
  196 void vm_object_vndeallocate (vm_object_t);
  197 void vm_object_set_writeable_dirty (vm_object_t);
  198 void vm_object_init (void);
  199 void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
  200 void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
  201 void vm_object_pmap_copy_1 (vm_object_t, vm_pindex_t, vm_pindex_t);
  202 void vm_object_reference (vm_object_t);
  203 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
  204 void vm_object_split(vm_map_entry_t);
  205 void vm_object_madvise (vm_object_t, vm_pindex_t, int, int);
  206 void vm_object_init2 (void);
  207 #endif                          /* _KERNEL */
  208 
  209 #endif                          /* _VM_OBJECT_ */

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