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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      from: @(#)vm_object.h   8.3 (Berkeley) 1/12/94
   33  *
   34  *
   35  * Copyright (c) 1987, 1990 Carnegie-Mellon University.
   36  * All rights reserved.
   37  *
   38  * Authors: Avadis Tevanian, Jr., Michael Wayne Young
   39  *
   40  * Permission to use, copy, modify and distribute this software and
   41  * its documentation is hereby granted, provided that both the copyright
   42  * notice and this permission notice appear in all copies of the
   43  * software, derivative works or modified versions, and any portions
   44  * thereof, and that both notices appear in supporting documentation.
   45  *
   46  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
   47  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
   48  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
   49  *
   50  * Carnegie Mellon requests users of this software to return to
   51  *
   52  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
   53  *  School of Computer Science
   54  *  Carnegie Mellon University
   55  *  Pittsburgh PA 15213-3890
   56  *
   57  * any improvements or extensions that they make and grant Carnegie the
   58  * rights to redistribute these changes.
   59  *
   60  * $FreeBSD: src/sys/vm/vm_object.h,v 1.111 2005/05/03 11:11:26 jeff Exp $
   61  */
   62 
   63 /*
   64  *      Virtual memory object module definitions.
   65  */
   66 
   67 #ifndef _VM_OBJECT_
   68 #define _VM_OBJECT_
   69 
   70 #include <sys/queue.h>
   71 #include <sys/_lock.h>
   72 #include <sys/_mutex.h>
   73 
   74 /*
   75  *      Types defined:
   76  *
   77  *      vm_object_t             Virtual memory object.
   78  *
   79  * List of locks
   80  *      (c)     const until freed
   81  *
   82  */
   83 
   84 struct vm_object {
   85         struct mtx mtx;
   86         TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
   87         LIST_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
   88         LIST_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
   89         TAILQ_HEAD(, vm_page) memq;     /* list of resident pages */
   90         vm_page_t root;                 /* root of the resident page splay tree */
   91         vm_pindex_t size;               /* Object size */
   92         int generation;                 /* generation ID */
   93         int ref_count;                  /* How many refs?? */
   94         int shadow_count;               /* how many objects that this is a shadow for */
   95         objtype_t type;                 /* type of pager */
   96         u_short flags;                  /* see below */
   97         u_short pg_color;               /* (c) color of first page in obj */
   98         u_short paging_in_progress;     /* Paging (in or out) so don't collapse or destroy */
   99         int resident_page_count;        /* number of resident pages */
  100         struct vm_object *backing_object; /* object that I'm a shadow of */
  101         vm_ooffset_t backing_object_offset;/* Offset in backing object */
  102         TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
  103         void *handle;
  104         union {
  105                 /*
  106                  * VNode pager
  107                  *
  108                  *      vnp_size - current size of file
  109                  */
  110                 struct {
  111                         off_t vnp_size;
  112                 } vnp;
  113 
  114                 /*
  115                  * Device pager
  116                  *
  117                  *      devp_pglist - list of allocated pages
  118                  */
  119                 struct {
  120                         TAILQ_HEAD(, vm_page) devp_pglist;
  121                 } devp;
  122 
  123                 /*
  124                  * Swap pager
  125                  *
  126                  *      swp_bcount - number of swap 'swblock' metablocks, each
  127                  *                   contains up to 16 swapblk assignments.
  128                  *                   see vm/swap_pager.h
  129                  */
  130                 struct {
  131                         int swp_bcount;
  132                 } swp;
  133         } un_pager;
  134 };
  135 
  136 /*
  137  * Flags
  138  */
  139 #define OBJ_ACTIVE      0x0004          /* active objects */
  140 #define OBJ_DEAD        0x0008          /* dead objects (during rundown) */
  141 #define OBJ_NOSPLIT     0x0010          /* dont split this object */
  142 #define OBJ_PIPWNT      0x0040          /* paging in progress wanted */
  143 #define OBJ_WRITEABLE   0x0080          /* object has been made writable */
  144 #define OBJ_MIGHTBEDIRTY 0x0100         /* object might be dirty */
  145 #define OBJ_CLEANING    0x0200
  146 #define OBJ_ONEMAPPING  0x2000          /* One USE (a single, non-forked) mapping flag */
  147 #define OBJ_DISCONNECTWNT 0x4000        /* disconnect from vnode wanted */
  148 #define OBJ_NEEDGIANT   0x8000          /* object requires Giant */
  149 
  150 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
  151 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
  152 
  153 #ifdef  _KERNEL
  154 
  155 #define OBJPC_SYNC      0x1                     /* sync I/O */
  156 #define OBJPC_INVAL     0x2                     /* invalidate */
  157 #define OBJPC_NOSYNC    0x4                     /* skip if PG_NOSYNC */
  158 
  159 TAILQ_HEAD(object_q, vm_object);
  160 
  161 extern struct object_q vm_object_list;  /* list of allocated objects */
  162 extern struct mtx vm_object_list_mtx;   /* lock for object list and count */
  163 
  164 extern struct vm_object kernel_object_store;
  165 extern struct vm_object kmem_object_store;
  166 
  167 #define kernel_object   (&kernel_object_store)
  168 #define kmem_object     (&kmem_object_store)
  169 
  170 #define VM_OBJECT_LOCK(object)          mtx_lock(&(object)->mtx)
  171 #define VM_OBJECT_LOCK_ASSERT(object, type) \
  172                                         mtx_assert(&(object)->mtx, (type))
  173 #define VM_OBJECT_LOCK_INIT(object, type) \
  174                                         mtx_init(&(object)->mtx, "vm object", \
  175                                             (type), MTX_DEF | MTX_DUPOK)
  176 #define VM_OBJECT_LOCKED(object)        mtx_owned(&(object)->mtx)
  177 #define VM_OBJECT_MTX(object)           (&(object)->mtx)
  178 #define VM_OBJECT_TRYLOCK(object)       mtx_trylock(&(object)->mtx)
  179 #define VM_OBJECT_UNLOCK(object)        mtx_unlock(&(object)->mtx)
  180 
  181 /*
  182  *      The object must be locked or thread private.
  183  */
  184 static __inline void
  185 vm_object_set_flag(vm_object_t object, u_short bits)
  186 {
  187 
  188         object->flags |= bits;
  189 }
  190 
  191 void vm_object_clear_flag(vm_object_t object, u_short bits);
  192 void vm_object_pip_add(vm_object_t object, short i);
  193 void vm_object_pip_subtract(vm_object_t object, short i);
  194 void vm_object_pip_wakeup(vm_object_t object);
  195 void vm_object_pip_wakeupn(vm_object_t object, short i);
  196 void vm_object_pip_wait(vm_object_t object, char *waitid);
  197 
  198 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
  199 void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t);
  200 boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t);
  201 void vm_object_collapse (vm_object_t);
  202 void vm_object_deallocate (vm_object_t);
  203 void vm_object_terminate (vm_object_t);
  204 void vm_object_vndeallocate (vm_object_t);
  205 void vm_object_set_writeable_dirty (vm_object_t);
  206 void vm_object_init (void);
  207 void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
  208 void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
  209 void vm_object_reference (vm_object_t);
  210 void vm_object_reference_locked(vm_object_t);
  211 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
  212 void vm_object_split(vm_map_entry_t);
  213 void vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t,
  214     boolean_t);
  215 void vm_object_madvise (vm_object_t, vm_pindex_t, int, int);
  216 #endif                          /* _KERNEL */
  217 
  218 #endif                          /* _VM_OBJECT_ */

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