bsd/sys/ubc.h

   1 /*
   2  * Copyright (c) 1999, 2000-2002 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  *      File:   ubc.h
  24  *      Author: Umesh Vaishampayan [umeshv@apple.com]
  25  *              05-Aug-1999     umeshv  Created.
  26  *
  27  *      Header file for Unified Buffer Cache.
  28  *
  29  */
  30
  31 #ifndef _SYS_UBC_H_
  32 #define _SYS_UBC_H_
  33
  34 #include <sys/appleapiopts.h>
  35 #include <sys/types.h>
  36 #include <sys/ucred.h>
  37 #include <sys/vnode.h>
  38
  39 #include <sys/cdefs.h>
  40
  41 #include <mach/memory_object_types.h>
  42
  43 #define UBC_INFO_NULL   ((struct ubc_info *) 0)
  44 #define UBC_NOINFO              ((struct ubc_info *)0xDEADD1ED)
  45
  46 #ifdef __APPLE_API_PRIVATE
  47 extern struct zone      *ubc_info_zone;
  48
  49 /*
  50  *      The following data structure keeps the information to associate
  51  *      a vnode to the correspondig VM objects.
  52  */
  53
  54 struct ubc_info {
  55         memory_object_t                 ui_pager;       /* pager */
  56         memory_object_control_t ui_control;     /* VM control for the pager */
  57         long                                    ui_flags;       /* flags */
  58         struct vnode                    *ui_vnode;      /* The vnode for this ubc_info */
  59         struct ucred                    *ui_ucred;      /* holds credentials for NFS paging */
  60         int                                             ui_refcount;/* ref count on the ubc_info */
  61         off_t                                   ui_size;        /* file size for the vnode */
  62         long                                    ui_mapped;      /* is it currently mapped */
  63         void                                    *ui_owner;      /* for recursive ubc_busy */
  64 };
  65
  66 /* Defines for ui_flags */
  67 #define UI_NONE                 0x00000000              /* none */
  68 #define UI_HASPAGER             0x00000001              /* has a pager associated */
  69 #define UI_INITED               0x00000002              /* newly initialized vnode */
  70 #define UI_HASOBJREF    0x00000004              /* hold a reference on object */
  71 #define UI_WASMAPPED    0x00000008              /* vnode was mapped */
  72 #define UI_DONTCACHE    0x00000010              /* do not cache object */
  73 #define UI_BUSY                 0x00000020              /* for VM synchronization */
  74 #define UI_WANTED               0x00000040              /* for VM synchronization */
  75
  76 #endif /* __APPLE_API_PRIVATE */
  77
  78 #ifdef __APPLE_API_EVOLVING
  79 /*
  80  * exported primitives for loadable file systems.
  81  */
  82
  83 __BEGIN_DECLS
  84 int     ubc_info_init __P((struct vnode *));
  85 void    ubc_info_deallocate  __P((struct ubc_info *));
  86 int     ubc_setsize __P((struct vnode *, off_t));
  87 off_t   ubc_getsize __P((struct vnode *));
  88 int     ubc_uncache __P((struct vnode *));
  89 int     ubc_umount __P((struct mount *));
  90 void    ubc_unmountall __P(());
  91 int     ubc_setcred __P((struct vnode *, struct proc *));
  92 struct ucred *ubc_getcred __P((struct vnode *));
  93 memory_object_t ubc_getpager __P((struct vnode *));
  94 memory_object_control_t ubc_getobject __P((struct vnode *, int));
  95 int ubc_setpager __P((struct vnode *, memory_object_t));
  96 int ubc_setflags __P((struct vnode *, int));
  97 int ubc_clearflags __P((struct vnode *, int));
  98 int ubc_issetflags __P((struct vnode *, int));
  99 off_t ubc_blktooff __P((struct vnode *, daddr_t));
 100 daddr_t ubc_offtoblk __P((struct vnode *, off_t));
 101 int ubc_clean __P((struct vnode *, int));
 102 int     ubc_pushdirty __P((struct vnode *));
 103 int     ubc_pushdirty_range __P((struct vnode *, off_t, off_t));
 104 int ubc_hold __P((struct vnode *));
 105 void ubc_rele __P((struct vnode *));
 106 void ubc_map __P((struct vnode *));
 107 int     ubc_destroy_named __P((struct vnode *));
 108 int     ubc_release_named __P((struct vnode *));
 109 int     ubc_invalidate __P((struct vnode *, off_t, size_t));
 110 int     ubc_isinuse __P((struct vnode *, int));
 111
 112 int     ubc_page_op __P((struct vnode *, off_t, int, vm_offset_t *, int *));
 113
 114 /* cluster IO routines */
 115 int     cluster_read __P((struct vnode *, struct uio *, off_t, int, int));
 116 int     advisory_read __P((struct vnode *, off_t, off_t, int, int));
 117 int     cluster_write __P((struct vnode *, struct uio*, off_t, off_t,
 118                 off_t, off_t,  int, int));
 119 int     cluster_push __P((struct vnode *));
 120 int     cluster_pageout __P((struct vnode *, upl_t, vm_offset_t, off_t, int,
 121                 off_t, int, int));
 122 int     cluster_pagein __P((struct vnode *, upl_t, vm_offset_t, off_t, int,
 123                 off_t, int, int));
 124 int     cluster_bp __P((struct buf *));
 125
 126 /* UPL routines */
 127 int     ubc_create_upl __P((struct vnode *, off_t, long, upl_t *,
 128                 upl_page_info_t **, int));
 129 int ubc_upl_map __P((upl_t, vm_offset_t *));
 130 int ubc_upl_unmap __P((upl_t));
 131 int ubc_upl_commit __P((upl_t));
 132 int ubc_upl_commit_range __P((upl_t, vm_offset_t, vm_size_t, int));
 133 int ubc_upl_abort __P((upl_t, int));
 134 int ubc_upl_abort_range __P((upl_t, vm_offset_t, vm_size_t, int));
 135 upl_page_info_t *ubc_upl_pageinfo __P((upl_t));
 136 __END_DECLS
 137
 138 #define UBCINFOMISSING(vp) \
 139         ((vp) && ((vp)->v_type == VREG) && ((vp)->v_ubcinfo == UBC_INFO_NULL))
 140
 141 #define UBCINFORECLAIMED(vp) \
 142         ((vp) && ((vp)->v_type == VREG) && ((vp)->v_ubcinfo == UBC_NOINFO))
 143
 144 #define UBCINFOEXISTS(vp) \
 145         ((vp) && ((vp)->v_type == VREG) && \
 146                 ((vp)->v_ubcinfo) && ((vp)->v_ubcinfo != UBC_NOINFO))
 147
 148 #define UBCISVALID(vp) \
 149         ((vp) && ((vp)->v_type == VREG) && !((vp)->v_flag & VSYSTEM))
 150
 151 #define UBCINVALID(vp) \
 152         (((vp) == NULL) || ((vp) && ((vp)->v_type != VREG))     \
 153                 || ((vp) && ((vp)->v_flag & VSYSTEM)))
 154
 155 #define UBCINFOCHECK(fun, vp)  \
 156         if ((vp) && ((vp)->v_type == VREG) &&   \
 157                         (((vp)->v_ubcinfo == UBC_INFO_NULL)     \
 158                         || ((vp)->v_ubcinfo == UBC_NOINFO))) \
 159                 panic("%s: lost ubc_info", (fun));
 160
 161 /* Flags for ubc_getobject() */
 162 #define UBC_FLAGS_NONE          0x0000
 163 #define UBC_HOLDOBJECT          0x0001
 164
 165 #endif /* __APPLE_API_EVOLVING */
 166
 167 #endif  /* _SYS_UBC_H_ */
 168