bsd/hfs/rangelist.h

   1 /*
   2  * Copyright (c) 2001 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 #ifndef _HFS_RANGELIST_H_
  31 #define _HFS_RANGELIST_H_
  32
  33 #include <sys/appleapiopts.h>
  34
  35 #ifdef KERNEL
  36 #ifdef __APPLE_API_PRIVATE
  37 #include <sys/types.h>
  38 #include <sys/queue.h>
  39
  40 enum rl_overlaptype {
  41     RL_NOOVERLAP = 0,           /* 0 */
  42     RL_MATCHINGOVERLAP,         /* 1 */
  43     RL_OVERLAPCONTAINSRANGE,    /* 2 */
  44     RL_OVERLAPISCONTAINED,      /* 3 */
  45     RL_OVERLAPSTARTSBEFORE,     /* 4 */
  46     RL_OVERLAPENDSAFTER         /* 5 */
  47 };
  48
  49 #define RL_INFINITY ((off_t)-1)
  50
  51 CIRCLEQ_HEAD(rl_head, rl_entry);
  52
  53 struct rl_entry {
  54     CIRCLEQ_ENTRY(rl_entry) rl_link;
  55     off_t rl_start;
  56     off_t rl_end;
  57 };
  58
  59 __BEGIN_DECLS
  60 void rl_init(struct rl_head *rangelist);
  61 void rl_add(off_t start, off_t end, struct rl_head *rangelist);
  62 void rl_remove(off_t start, off_t end, struct rl_head *rangelist);
  63 enum rl_overlaptype rl_scan(struct rl_head *rangelist,
  64                                                         off_t start,
  65                                                         off_t end,
  66                                                         struct rl_entry **overlap);
  67 __END_DECLS
  68
  69 #endif /* __APPLE_API_PRIVATE */
  70 #endif /* KERNEL */
  71 #endif /* ! _HFS_RANGELIST_H_ */