linux/fs/ntfs/ntfs.h
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   1/*
   2 * ntfs.h - Defines for NTFS Linux kernel driver. Part of the Linux-NTFS
   3 *          project.
   4 *
   5 * Copyright (c) 2001-2005 Anton Altaparmakov
   6 * Copyright (C) 2002 Richard Russon
   7 *
   8 * This program/include file is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License as published
  10 * by the Free Software Foundation; either version 2 of the License, or
  11 * (at your option) any later version.
  12 *
  13 * This program/include file is distributed in the hope that it will be
  14 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  15 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 * GNU General Public License for more details.
  17 *
  18 * You should have received a copy of the GNU General Public License
  19 * along with this program (in the main directory of the Linux-NTFS
  20 * distribution in the file COPYING); if not, write to the Free Software
  21 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22 */
  23
  24#ifndef _LINUX_NTFS_H
  25#define _LINUX_NTFS_H
  26
  27#include <linux/stddef.h>
  28#include <linux/kernel.h>
  29#include <linux/module.h>
  30#include <linux/compiler.h>
  31#include <linux/fs.h>
  32#include <linux/nls.h>
  33#include <linux/smp.h>
  34#include <linux/pagemap.h>
  35
  36#include "types.h"
  37#include "volume.h"
  38#include "layout.h"
  39
  40typedef enum {
  41        NTFS_BLOCK_SIZE         = 512,
  42        NTFS_BLOCK_SIZE_BITS    = 9,
  43        NTFS_SB_MAGIC           = 0x5346544e,   /* 'NTFS' */
  44        NTFS_MAX_NAME_LEN       = 255,
  45        NTFS_MAX_ATTR_NAME_LEN  = 255,
  46        NTFS_MAX_CLUSTER_SIZE   = 64 * 1024,    /* 64kiB */
  47        NTFS_MAX_PAGES_PER_CLUSTER = NTFS_MAX_CLUSTER_SIZE / PAGE_CACHE_SIZE,
  48} NTFS_CONSTANTS;
  49
  50/* Global variables. */
  51
  52/* Slab caches (from super.c). */
  53extern struct kmem_cache *ntfs_name_cache;
  54extern struct kmem_cache *ntfs_inode_cache;
  55extern struct kmem_cache *ntfs_big_inode_cache;
  56extern struct kmem_cache *ntfs_attr_ctx_cache;
  57extern struct kmem_cache *ntfs_index_ctx_cache;
  58
  59/* The various operations structs defined throughout the driver files. */
  60extern const struct address_space_operations ntfs_aops;
  61extern const struct address_space_operations ntfs_mst_aops;
  62
  63extern const struct  file_operations ntfs_file_ops;
  64extern const struct inode_operations ntfs_file_inode_ops;
  65
  66extern const struct  file_operations ntfs_dir_ops;
  67extern const struct inode_operations ntfs_dir_inode_ops;
  68
  69extern const struct  file_operations ntfs_empty_file_ops;
  70extern const struct inode_operations ntfs_empty_inode_ops;
  71
  72extern const struct export_operations ntfs_export_ops;
  73
  74/**
  75 * NTFS_SB - return the ntfs volume given a vfs super block
  76 * @sb:         VFS super block
  77 *
  78 * NTFS_SB() returns the ntfs volume associated with the VFS super block @sb.
  79 */
  80static inline ntfs_volume *NTFS_SB(struct super_block *sb)
  81{
  82        return sb->s_fs_info;
  83}
  84
  85/* Declarations of functions and global variables. */
  86
  87/* From fs/ntfs/compress.c */
  88extern int ntfs_read_compressed_block(struct page *page);
  89extern int allocate_compression_buffers(void);
  90extern void free_compression_buffers(void);
  91
  92/* From fs/ntfs/super.c */
  93#define default_upcase_len 0x10000
  94extern struct mutex ntfs_lock;
  95
  96typedef struct {
  97        int val;
  98        char *str;
  99} option_t;
 100extern const option_t on_errors_arr[];
 101
 102/* From fs/ntfs/mst.c */
 103extern int post_read_mst_fixup(NTFS_RECORD *b, const u32 size);
 104extern int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size);
 105extern void post_write_mst_fixup(NTFS_RECORD *b);
 106
 107/* From fs/ntfs/unistr.c */
 108extern bool ntfs_are_names_equal(const ntfschar *s1, size_t s1_len,
 109                const ntfschar *s2, size_t s2_len,
 110                const IGNORE_CASE_BOOL ic,
 111                const ntfschar *upcase, const u32 upcase_size);
 112extern int ntfs_collate_names(const ntfschar *name1, const u32 name1_len,
 113                const ntfschar *name2, const u32 name2_len,
 114                const int err_val, const IGNORE_CASE_BOOL ic,
 115                const ntfschar *upcase, const u32 upcase_len);
 116extern int ntfs_ucsncmp(const ntfschar *s1, const ntfschar *s2, size_t n);
 117extern int ntfs_ucsncasecmp(const ntfschar *s1, const ntfschar *s2, size_t n,
 118                const ntfschar *upcase, const u32 upcase_size);
 119extern void ntfs_upcase_name(ntfschar *name, u32 name_len,
 120                const ntfschar *upcase, const u32 upcase_len);
 121extern void ntfs_file_upcase_value(FILE_NAME_ATTR *file_name_attr,
 122                const ntfschar *upcase, const u32 upcase_len);
 123extern int ntfs_file_compare_values(FILE_NAME_ATTR *file_name_attr1,
 124                FILE_NAME_ATTR *file_name_attr2,
 125                const int err_val, const IGNORE_CASE_BOOL ic,
 126                const ntfschar *upcase, const u32 upcase_len);
 127extern int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
 128                const int ins_len, ntfschar **outs);
 129extern int ntfs_ucstonls(const ntfs_volume *vol, const ntfschar *ins,
 130                const int ins_len, unsigned char **outs, int outs_len);
 131
 132/* From fs/ntfs/upcase.c */
 133extern ntfschar *generate_default_upcase(void);
 134
 135static inline int ntfs_ffs(int x)
 136{
 137        int r = 1;
 138
 139        if (!x)
 140                return 0;
 141        if (!(x & 0xffff)) {
 142                x >>= 16;
 143                r += 16;
 144        }
 145        if (!(x & 0xff)) {
 146                x >>= 8;
 147                r += 8;
 148        }
 149        if (!(x & 0xf)) {
 150                x >>= 4;
 151                r += 4;
 152        }
 153        if (!(x & 3)) {
 154                x >>= 2;
 155                r += 2;
 156        }
 157        if (!(x & 1)) {
 158                x >>= 1;
 159                r += 1;
 160        }
 161        return r;
 162}
 163
 164#endif /* _LINUX_NTFS_H */
 165
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