bsd/hfs/rangelist.h

   1 /*
   2  * Copyright (c) 2001 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 #ifndef _HFS_RANGELIST_H_
  24 #define _HFS_RANGELIST_H_
  25
  26 #include <sys/appleapiopts.h>
  27
  28 #ifdef KERNEL
  29 #ifdef __APPLE_API_PRIVATE
  30 #include <sys/types.h>
  31 #include <sys/queue.h>
  32
  33 enum rl_overlaptype {
  34     RL_NOOVERLAP = 0,           /* 0 */
  35     RL_MATCHINGOVERLAP,         /* 1 */
  36     RL_OVERLAPCONTAINSRANGE,    /* 2 */
  37     RL_OVERLAPISCONTAINED,      /* 3 */
  38     RL_OVERLAPSTARTSBEFORE,     /* 4 */
  39     RL_OVERLAPENDSAFTER         /* 5 */
  40 };
  41
  42 #define RL_INFINITY ((off_t)-1)
  43
  44 CIRCLEQ_HEAD(rl_head, rl_entry);
  45
  46 struct rl_entry {
  47     CIRCLEQ_ENTRY(rl_entry) rl_link;
  48     off_t rl_start;
  49     off_t rl_end;
  50 };
  51
  52 __BEGIN_DECLS
  53 void rl_init(struct rl_head *rangelist);
  54 void rl_add(off_t start, off_t end, struct rl_head *rangelist);
  55 void rl_remove(off_t start, off_t end, struct rl_head *rangelist);
  56 enum rl_overlaptype rl_scan(struct rl_head *rangelist,
  57                                                         off_t start,
  58                                                         off_t end,
  59                                                         struct rl_entry **overlap);
  60 __END_DECLS
  61
  62 #endif /* __APPLE_API_PRIVATE */
  63 #endif /* KERNEL */
  64 #endif /* ! _HFS_RANGELIST_H_ */