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

     /*
      * Copyright (c) 1991, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * This code is derived from software contributed to Berkeley by
      * The Mach Operating System project at Carnegie-Mellon University.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by the University of
     *      California, Berkeley and its contributors.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      from: @(#)vm_object.h   8.3 (Berkeley) 1/12/94
     *
     *
     * Copyright (c) 1987, 1990 Carnegie-Mellon University.
     * All rights reserved.
     *
     * Authors: Avadis Tevanian, Jr., Michael Wayne Young
     *
     * Permission to use, copy, modify and distribute this software and
     * its documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     *
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     *
     * Carnegie Mellon requests users of this software to return to
     *
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     *
     * any improvements or extensions that they make and grant Carnegie the
     * rights to redistribute these changes.
     *
     * $FreeBSD$
     */
    
    /*
     *      Virtual memory object module definitions.
     */
    
    #ifndef _VM_OBJECT_
    #define _VM_OBJECT_
    
    #include <sys/queue.h>
    #include <machine/atomic.h>
    
    enum obj_type { OBJT_DEFAULT, OBJT_SWAP, OBJT_VNODE, OBJT_DEVICE, OBJT_DEAD };
    typedef enum obj_type objtype_t;
    
    /*
     *      Types defined:
     *
     *      vm_object_t             Virtual memory object.
     */
    
    struct vm_object {
            TAILQ_ENTRY(vm_object) object_list; /* list of all objects */
            TAILQ_HEAD(, vm_object) shadow_head; /* objects that this is a shadow for */
            TAILQ_ENTRY(vm_object) shadow_list; /* chain of shadow objects */
            TAILQ_HEAD(, vm_page) memq;     /* list of resident pages */
            int generation;                 /* generation ID */
            objtype_t type;                 /* type of pager */
            vm_size_t size;                 /* Object size */
            int ref_count;                  /* How many refs?? */
            int shadow_count;               /* how many objects that this is a shadow for */
            int     id;                                     /* ID for no purpose, other than info */
            u_short flags;                  /* see below */
            u_short pg_color;               /* color of first page in obj */
            u_short paging_in_progress;     /* Paging (in or out) so don't collapse or destroy */
           u_short behavior;               /* see below */
           int resident_page_count;        /* number of resident pages */
           vm_ooffset_t paging_offset;     /* Offset into paging space */
           struct vm_object *backing_object; /* object that I'm a shadow of */
           vm_ooffset_t backing_object_offset;/* Offset in backing object */
           vm_offset_t last_read;          /* last read in object -- detect seq behavior */
           vm_page_t page_hint;            /* hint for last looked-up or allocated page */
           TAILQ_ENTRY(vm_object) pager_object_list; /* list of all objects of this pager type */
           void *handle;
           union {
                   struct {
                           off_t vnp_size; /* Current size of file */
                   } vnp;
                   struct {
                           TAILQ_HEAD(, vm_page) devp_pglist; /* list of pages allocated */
                   } devp;
                   struct {
                           int swp_nblocks;
                           int swp_allocsize;
                           struct swblock *swp_blocks;
                           short swp_poip;
                   } swp;
           } un_pager;
   };
   
   /*
    * Flags
    */
   #define OBJ_ACTIVE      0x0004          /* active objects */
   #define OBJ_DEAD        0x0008          /* dead objects (during rundown) */
   #define OBJ_NOSPLIT     0x0010          /* dont split this object */
   #define OBJ_PIPWNT      0x0040          /* paging in progress wanted */
   #define OBJ_WRITEABLE   0x0080          /* object has been made writable */
   #define OBJ_MIGHTBEDIRTY        0x0100  /* object might be dirty */
   #define OBJ_CLEANING    0x0200
   #define OBJ_OPT         0x1000          /* I/O optimization */
   #define OBJ_ONEMAPPING  0x2000          /* One USE (a single, non-forked) mapping flag */
   
   #define OBJ_NORMAL      0x0             /* default behavior */
   #define OBJ_SEQUENTIAL  0x1             /* expect sequential accesses */
   #define OBJ_RANDOM      0x2             /* expect random accesses */
   
   #define IDX_TO_OFF(idx) (((vm_ooffset_t)(idx)) << PAGE_SHIFT)
   #define OFF_TO_IDX(off) ((vm_pindex_t)(((vm_ooffset_t)(off)) >> PAGE_SHIFT))
   
   #ifdef  KERNEL
   
   #define OBJPC_SYNC      0x1                     /* sync I/O */
   #define OBJPC_INVAL     0x2                     /* invalidate */
   
   TAILQ_HEAD(object_q, vm_object);
   
   extern struct object_q vm_object_list;  /* list of allocated objects */
   
    /* lock for object list and count */
   
   extern vm_object_t kernel_object;       /* the single kernel object */
   extern vm_object_t kmem_object;
   
   #endif                          /* KERNEL */
   
   #ifdef KERNEL
   
   static __inline void
   vm_object_set_flag(vm_object_t object, u_int bits)
   {
           atomic_set_short(&object->flags, bits);
   }
   
   static __inline void
   vm_object_clear_flag(vm_object_t object, u_int bits)
   {
           atomic_clear_short(&object->flags, bits);
   }
   
   static __inline void
   vm_object_pip_add(vm_object_t object, int i)
   {
           atomic_add_short(&object->paging_in_progress, i);
   }
   
   static __inline void
   vm_object_pip_subtract(vm_object_t object, int i)
   {
           atomic_subtract_short(&object->paging_in_progress, i);
   }
   
   static __inline void
   vm_object_pip_wakeup(vm_object_t object)
   {
           atomic_subtract_short(&object->paging_in_progress, 1);
           if ((object->flags & OBJ_PIPWNT) && object->paging_in_progress == 0) {
                   vm_object_clear_flag(object, OBJ_PIPWNT);
                   wakeup(object);
           }
   }
   
   static __inline void
   vm_object_pip_sleep(vm_object_t object, char *waitid)
   {
           int s;
   
           if (object->paging_in_progress) {
                   s = splvm();
                   if (object->paging_in_progress) {
                           vm_object_set_flag(object, OBJ_PIPWNT);
                           tsleep(object, PVM, waitid, 0);
                   }
                   splx(s);
           }
   }
   
   static __inline void
   vm_object_pip_wait(vm_object_t object, char *waitid)
   {
           while (object->paging_in_progress)
                   vm_object_pip_sleep(object, waitid);
   }
   
   vm_object_t vm_object_allocate __P((objtype_t, vm_size_t));
   void _vm_object_allocate __P((objtype_t, vm_size_t, vm_object_t));
   boolean_t vm_object_coalesce __P((vm_object_t, vm_pindex_t, vm_size_t, vm_size_t));
   void vm_object_collapse __P((vm_object_t));
   void vm_object_copy __P((vm_object_t, vm_pindex_t, vm_object_t *, vm_pindex_t *, boolean_t *));
   void vm_object_deallocate __P((vm_object_t));
   void vm_object_terminate __P((vm_object_t));
   void vm_object_vndeallocate __P((vm_object_t));
   void vm_object_init __P((void));
   void vm_object_page_clean __P((vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t));
   void vm_object_page_remove __P((vm_object_t, vm_pindex_t, vm_pindex_t, boolean_t));
   void vm_object_pmap_copy __P((vm_object_t, vm_pindex_t, vm_pindex_t));
   void vm_object_pmap_copy_1 __P((vm_object_t, vm_pindex_t, vm_pindex_t));
   void vm_object_pmap_remove __P((vm_object_t, vm_pindex_t, vm_pindex_t));
   void vm_object_reference __P((vm_object_t));
   void vm_object_shadow __P((vm_object_t *, vm_ooffset_t *, vm_size_t));
   void vm_object_madvise __P((vm_object_t, vm_pindex_t, int, int));
   void vm_object_init2 __P((void));
   #endif                          /* KERNEL */
   
   #endif                          /* _VM_OBJECT_ */

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