bsd/hfs/rangelist.h

   1 /*
   2  * Copyright (c) 2001 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 #ifndef _HFS_RANGELIST_H_
  23 #define _HFS_RANGELIST_H_
  24
  25 #include <sys/appleapiopts.h>
  26
  27 #ifdef KERNEL
  28 #ifdef __APPLE_API_PRIVATE
  29 #include <sys/types.h>
  30 #include <sys/queue.h>
  31
  32 enum rl_overlaptype {
  33     RL_NOOVERLAP = 0,           /* 0 */
  34     RL_MATCHINGOVERLAP,         /* 1 */
  35     RL_OVERLAPCONTAINSRANGE,    /* 2 */
  36     RL_OVERLAPISCONTAINED,      /* 3 */
  37     RL_OVERLAPSTARTSBEFORE,     /* 4 */
  38     RL_OVERLAPENDSAFTER         /* 5 */
  39 };
  40
  41 #define RL_INFINITY ((off_t)-1)
  42
  43 CIRCLEQ_HEAD(rl_head, rl_entry);
  44
  45 struct rl_entry {
  46     CIRCLEQ_ENTRY(rl_entry) rl_link;
  47     off_t rl_start;
  48     off_t rl_end;
  49 };
  50
  51 __BEGIN_DECLS
  52 void rl_init(struct rl_head *rangelist);
  53 void rl_add(off_t start, off_t end, struct rl_head *rangelist);
  54 void rl_remove(off_t start, off_t end, struct rl_head *rangelist);
  55 enum rl_overlaptype rl_scan(struct rl_head *rangelist,
  56                                                         off_t start,
  57                                                         off_t end,
  58                                                         struct rl_entry **overlap);
  59 __END_DECLS
  60
  61 #endif /* __APPLE_API_PRIVATE */
  62 #endif /* KERNEL */
  63 #endif /* ! _HFS_RANGELIST_H_ */