fs/ntfs/types.h

   1 /*
   2  * types.h - Defines for NTFS Linux kernel driver specific types.
   3  *           Part of the Linux-NTFS project.
   4  *
   5  * Copyright (c) 2001-2004 Anton Altaparmakov
   6  *
   7  * This program/include file is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as published
   9  * by the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program/include file is distributed in the hope that it will be
  13  * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  14  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program (in the main directory of the Linux-NTFS
  19  * distribution in the file COPYING); if not, write to the Free Software
  20  * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #ifndef _LINUX_NTFS_TYPES_H
  24 #define _LINUX_NTFS_TYPES_H
  25
  26 #include <linux/types.h>
  27
  28 typedef __le16 le16;
  29 typedef __le32 le32;
  30 typedef __le64 le64;
  31 typedef __u16 __bitwise sle16;
  32 typedef __u32 __bitwise sle32;
  33 typedef __u64 __bitwise sle64;
  34
  35 /* 2-byte Unicode character type. */
  36 typedef le16 ntfschar;
  37 #define UCHAR_T_SIZE_BITS 1
  38
  39 /*
  40  * Clusters are signed 64-bit values on NTFS volumes. We define two types, LCN
  41  * and VCN, to allow for type checking and better code readability.
  42  */
  43 typedef s64 VCN;
  44 typedef sle64 leVCN;
  45 typedef s64 LCN;
  46 typedef sle64 leLCN;
  47
  48 /*
  49  * The NTFS journal $LogFile uses log sequence numbers which are signed 64-bit
  50  * values.  We define our own type LSN, to allow for type checking and better
  51  * code readability.
  52  */
  53 typedef s64 LSN;
  54 typedef sle64 leLSN;
  55
  56 /**
  57  * runlist_element - in memory vcn to lcn mapping array element
  58  * @vcn:        starting vcn of the current array element
  59  * @lcn:        starting lcn of the current array element
  60  * @length:     length in clusters of the current array element
  61  *
  62  * The last vcn (in fact the last vcn + 1) is reached when length == 0.
  63  *
  64  * When lcn == -1 this means that the count vcns starting at vcn are not
  65  * physically allocated (i.e. this is a hole / data is sparse).
  66  */
  67 typedef struct {        /* In memory vcn to lcn mapping structure element. */
  68         VCN vcn;        /* vcn = Starting virtual cluster number. */
  69         LCN lcn;        /* lcn = Starting logical cluster number. */
  70         s64 length;     /* Run length in clusters. */
  71 } runlist_element;
  72
  73 /**
  74  * runlist - in memory vcn to lcn mapping array including a read/write lock
  75  * @rl:         pointer to an array of runlist elements
  76  * @lock:       read/write spinlock for serializing access to @rl
  77  *
  78  */
  79 typedef struct {
  80         runlist_element *rl;
  81         struct rw_semaphore lock;
  82 } runlist;
  83
  84 typedef enum {
  85         FALSE = 0,
  86         TRUE = 1
  87 } BOOL;
  88
  89 typedef enum {
  90         CASE_SENSITIVE = 0,
  91         IGNORE_CASE = 1,
  92 } IGNORE_CASE_BOOL;
  93
  94 #endif /* _LINUX_NTFS_TYPES_H */