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: releng/8.0/sys/vm/vm_object.h 195840 2009-07-24 13:50:29Z jhb $
   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         vm_memattr_t memattr;           /* default memory attribute for pages */
   96         objtype_t type;                 /* type of pager */
   97         u_short flags;                  /* see below */
   98         u_short pg_color;               /* (c) color of first page in obj */
   99         u_short paging_in_progress;     /* Paging (in or out) so don't collapse or destroy */
  100         int resident_page_count;        /* number of resident pages */
  101         struct vm_object *backing_object; /* object that I'm a shadow of */
  102         vm_ooffset_t backing_object_offset;/* Offset in backing object */
  103         TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
  104         LIST_HEAD(, vm_reserv) rvq;     /* list of reservations */
  105         vm_page_t cache;                /* root of the cache page splay tree */
  106         void *handle;
  107         union {
  108                 /*
  109                  * VNode pager
  110                  *
  111                  *      vnp_size - current size of file
  112                  */
  113                 struct {
  114                         off_t vnp_size;
  115                 } vnp;
  116 
  117                 /*
  118                  * Device pager
  119                  *
  120                  *      devp_pglist - list of allocated pages
  121                  */
  122                 struct {
  123                         TAILQ_HEAD(, vm_page) devp_pglist;
  124                 } devp;
  125 
  126                 /*
  127                  * SG pager
  128                  *
  129                  *      sgp_pglist - list of allocated pages
  130                  */
  131                 struct {
  132                         TAILQ_HEAD(, vm_page) sgp_pglist;
  133                 } sgp;
  134 
  135                 /*
  136                  * Swap pager
  137                  *
  138                  *      swp_bcount - number of swap 'swblock' metablocks, each
  139                  *                   contains up to 16 swapblk assignments.
  140                  *                   see vm/swap_pager.h
  141                  */
  142                 struct {
  143                         int swp_bcount;
  144                 } swp;
  145         } un_pager;
  146         struct uidinfo *uip;
  147         vm_ooffset_t charge;
  148 };
  149 
  150 /*
  151  * Flags
  152  */
  153 #define OBJ_ACTIVE      0x0004          /* active objects */
  154 #define OBJ_DEAD        0x0008          /* dead objects (during rundown) */
  155 #define OBJ_NOSPLIT     0x0010          /* dont split this object */
  156 #define OBJ_PIPWNT      0x0040          /* paging in progress wanted */
  157 #define OBJ_MIGHTBEDIRTY 0x0100         /* object might be dirty */
  158 #define OBJ_CLEANING    0x0200
  159 #define OBJ_COLORED     0x1000          /* pg_color is defined */
  160 #define OBJ_ONEMAPPING  0x2000          /* One USE (a single, non-forked) mapping flag */
  161 #define OBJ_DISCONNECTWNT 0x4000        /* disconnect from vnode wanted */
  162 
  163 #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
  164 #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
  165 
  166 #ifdef  _KERNEL
  167 
  168 #define OBJPC_SYNC      0x1                     /* sync I/O */
  169 #define OBJPC_INVAL     0x2                     /* invalidate */
  170 #define OBJPC_NOSYNC    0x4                     /* skip if PG_NOSYNC */
  171 
  172 TAILQ_HEAD(object_q, vm_object);
  173 
  174 extern struct object_q vm_object_list;  /* list of allocated objects */
  175 extern struct mtx vm_object_list_mtx;   /* lock for object list and count */
  176 
  177 extern struct vm_object kernel_object_store;
  178 extern struct vm_object kmem_object_store;
  179 
  180 #define kernel_object   (&kernel_object_store)
  181 #define kmem_object     (&kmem_object_store)
  182 
  183 #define VM_OBJECT_LOCK(object)          mtx_lock(&(object)->mtx)
  184 #define VM_OBJECT_LOCK_ASSERT(object, type) \
  185                                         mtx_assert(&(object)->mtx, (type))
  186 #define VM_OBJECT_LOCK_INIT(object, type) \
  187                                         mtx_init(&(object)->mtx, "vm object", \
  188                                             (type), MTX_DEF | MTX_DUPOK)
  189 #define VM_OBJECT_LOCKED(object)        mtx_owned(&(object)->mtx)
  190 #define VM_OBJECT_MTX(object)           (&(object)->mtx)
  191 #define VM_OBJECT_TRYLOCK(object)       mtx_trylock(&(object)->mtx)
  192 #define VM_OBJECT_UNLOCK(object)        mtx_unlock(&(object)->mtx)
  193 
  194 /*
  195  *      The object must be locked or thread private.
  196  */
  197 static __inline void
  198 vm_object_set_flag(vm_object_t object, u_short bits)
  199 {
  200 
  201         object->flags |= bits;
  202 }
  203 
  204 void vm_object_clear_flag(vm_object_t object, u_short bits);
  205 void vm_object_pip_add(vm_object_t object, short i);
  206 void vm_object_pip_subtract(vm_object_t object, short i);
  207 void vm_object_pip_wakeup(vm_object_t object);
  208 void vm_object_pip_wakeupn(vm_object_t object, short i);
  209 void vm_object_pip_wait(vm_object_t object, char *waitid);
  210 
  211 vm_object_t vm_object_allocate (objtype_t, vm_pindex_t);
  212 void _vm_object_allocate (objtype_t, vm_pindex_t, vm_object_t);
  213 boolean_t vm_object_coalesce(vm_object_t, vm_ooffset_t, vm_size_t, vm_size_t,
  214    boolean_t);
  215 void vm_object_collapse (vm_object_t);
  216 void vm_object_deallocate (vm_object_t);
  217 void vm_object_destroy (vm_object_t);
  218 void vm_object_terminate (vm_object_t);
  219 void vm_object_set_writeable_dirty (vm_object_t);
  220 void vm_object_init (void);
  221 void vm_object_page_clean (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
  222 void vm_object_page_remove (vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t);
  223 boolean_t vm_object_populate(vm_object_t, vm_pindex_t, vm_pindex_t);
  224 void vm_object_reference (vm_object_t);
  225 void vm_object_reference_locked(vm_object_t);
  226 int  vm_object_set_memattr(vm_object_t object, vm_memattr_t memattr);
  227 void vm_object_shadow (vm_object_t *, vm_ooffset_t *, vm_size_t);
  228 void vm_object_split(vm_map_entry_t);
  229 void vm_object_sync(vm_object_t, vm_ooffset_t, vm_size_t, boolean_t,
  230     boolean_t);
  231 void vm_object_madvise (vm_object_t, vm_pindex_t, int, int);
  232 #endif                          /* _KERNEL */
  233 
  234 #endif                          /* _VM_OBJECT_ */

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