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Annotation of XNU/bsd/kern/mapfs.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* 
        !            23:  * Mach Operating System
        !            24:  * Copyright (c) 1987 Carnegie-Mellon University
        !            25:  * All rights reserved.  The CMU software License Agreement specifies
        !            26:  * the terms and conditions for use and redistribution.
        !            27:  */
        !            28: /*
        !            29:  * HISTORY
        !            30:  *  3-Aug-90  Doug Mitchell at NeXT
        !            31:  *     Added prototypes for exported functions.
        !            32:  *
        !            33:  * 18-Feb-90  Gregg Kellogg (gk) at NeXT
        !            34:  *     Merged in with Mach 2.5 stuff.
        !            35:  *
        !            36:  *  9-Mar-88  John Seamons (jks) at NeXT
        !            37:  *     Allocate vm_info structures from a zone.
        !            38:  *
        !            39:  * 11-Jun-87  William Bolosky (bolosky) at Carnegie-Mellon University
        !            40:  *     Changed pager_id to pager.
        !            41:  *
        !            42:  * 30-Apr-87  Avadis Tevanian (avie) at Carnegie-Mellon University
        !            43:  *     Created.
        !            44:  */
        !            45: /*
        !            46:  *     File:   mapfs.h
        !            47:  *     Author: Avadis Tevanian, Jr.
        !            48:  *     Copyright (C) 1987, Avadis Tevanian, Jr.
        !            49:  *
        !            50:  *     Header file for mapped file system support.
        !            51:  *
        !            52:  */ 
        !            53: 
        !            54: #ifndef        _KERN_MAPFS_H_
        !            55: #define        _KERN_MAPFS_H_
        !            56: 
        !            57: #include <vm/vnode_pager.h>
        !            58: #include <kern/queue.h>
        !            59: #include <sys/types.h>
        !            60: #include <sys/vnode.h>
        !            61: 
        !            62: #include <sys/lock.h>
        !            63: /*
        !            64:  *     Associated with each mapped file is information about its
        !            65:  *     corresponding VM window.  This information is kept in the following
        !            66:  *     vm_info structure.
        !            67:  */
        !            68: struct vm_info {
        !            69:        vnode_pager_t   pager;          /*  pager */
        !            70:        short           map_count;      /* number of times mapped */
        !            71:        short           use_count;      /* number of times in use */
        !            72:        vm_offset_t     va;             /* mapped virtual address */
        !            73:        vm_size_t       size;           /* mapped size */
        !            74:        vm_offset_t     offset;         /* offset into file at va */
        !            75:        vm_size_t       vnode_size;     /* vnode size (not reflected in ip) */
        !            76:        void *          lock;           /* lock for changing window */
        !            77:        void *          object;         /* object [for KERNEL flushing] */
        !            78:        queue_chain_t   lru_links;      /* lru queue links */
        !            79:        struct ucred    *cred;          /* vnode credentials */
        !            80:        int             error;          /* holds error codes */
        !            81:        u_int   queued:1,       /* on lru queue? */
        !            82:                        dirty:1,        /* range needs flushing? */
        !            83:                        close_flush:1,  /* flush on close */
        !            84:                        invalidate:1,   /* is mapping invalid? */
        !            85:                        busy:1,                 /* are we busy conducting an uiomove */
        !            86:                        delayed_fsync:1,/* need to do a push after the uiomove completes */
        !            87:                        filesize:1,             /* want size as reflected in ip */
        !            88:                        mapped:1,               /* mapped into KERNEL VM? */
        !            89:                        dying:1;                /* vm_info being freed */
        !            90:        vm_size_t       dirtysize;      /* unwritten data so far */
        !            91:        vm_offset_t     dirtyoffset;    /* unwritten data so far */
        !            92: };
        !            93: 
        !            94: #define VM_INFO_NULL   ((struct vm_info *) 0)
        !            95: 
        !            96: extern struct zone     *vm_info_zone;
        !            97: 
        !            98: /*
        !            99:  * exported primitives for loadable file systems.
        !           100:  */
        !           101: int vm_info_init __P((struct vnode *));
        !           102: void vm_info_free  __P((struct vnode *));
        !           103: 
        !           104: #define ISMAPPABLEFILE(vp)     \
        !           105:        (((vp)->v_type == VREG) && ((vp)->v_vm_info))
        !           106: 
        !           107: #define ISMAPPEDFILE(vp)       \
        !           108:        (((vp)->v_type == VREG) &&      \
        !           109:        ((vp)->v_vm_info) && ((vp)->v_vm_info->mapped))
        !           110: 
        !           111: #define NOTMAPPEDFILE(vp)      \
        !           112:        (((vp)->v_type == VREG) &&      \
        !           113:        (((vp)->v_vm_info) && !((vp)->v_vm_info->mapped)))
        !           114: 
        !           115: #define ISMAPFILEFLUSH(vp)     \
        !           116:        (((vp)->v_type == VREG) &&      \
        !           117:        ((vp)->v_vm_info) && ((vp)->v_vm_info->mapped) && \
        !           118:        ((vp)->v_vm_info->dirty))
        !           119: 
        !           120: 
        !           121: 
        !           122: #endif /* _KERN_MAPFS_H_ */
        !           123: 

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