root/fs/ntfs/ntfs.h

INCLUDED FROM

DEFINITIONS

1. NTFS_SB
2. ntfs_ffs

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * ntfs.h - Defines for NTFS Linux kernel driver.
   4  *
   5  * Copyright (c) 2001-2014 Anton Altaparmakov and Tuxera Inc.
   6  * Copyright (C) 2002 Richard Russon
   7  */
   8 
   9 #ifndef _LINUX_NTFS_H
  10 #define _LINUX_NTFS_H
  11 
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/compiler.h>
  16 #include <linux/fs.h>
  17 #include <linux/nls.h>
  18 #include <linux/smp.h>
  19 #include <linux/pagemap.h>
  20 
  21 #include "types.h"
  22 #include "volume.h"
  23 #include "layout.h"
  24 
  25 typedef enum {
  26         NTFS_BLOCK_SIZE         = 512,
  27         NTFS_BLOCK_SIZE_BITS    = 9,
  28         NTFS_SB_MAGIC           = 0x5346544e,   /* 'NTFS' */
  29         NTFS_MAX_NAME_LEN       = 255,
  30         NTFS_MAX_ATTR_NAME_LEN  = 255,
  31         NTFS_MAX_CLUSTER_SIZE   = 64 * 1024,    /* 64kiB */
  32         NTFS_MAX_PAGES_PER_CLUSTER = NTFS_MAX_CLUSTER_SIZE / PAGE_SIZE,
  33 } NTFS_CONSTANTS;
  34 
  35 /* Global variables. */
  36 
  37 /* Slab caches (from super.c). */
  38 extern struct kmem_cache *ntfs_name_cache;
  39 extern struct kmem_cache *ntfs_inode_cache;
  40 extern struct kmem_cache *ntfs_big_inode_cache;
  41 extern struct kmem_cache *ntfs_attr_ctx_cache;
  42 extern struct kmem_cache *ntfs_index_ctx_cache;
  43 
  44 /* The various operations structs defined throughout the driver files. */
  45 extern const struct address_space_operations ntfs_normal_aops;
  46 extern const struct address_space_operations ntfs_compressed_aops;
  47 extern const struct address_space_operations ntfs_mst_aops;
  48 
  49 extern const struct  file_operations ntfs_file_ops;
  50 extern const struct inode_operations ntfs_file_inode_ops;
  51 
  52 extern const struct  file_operations ntfs_dir_ops;
  53 extern const struct inode_operations ntfs_dir_inode_ops;
  54 
  55 extern const struct  file_operations ntfs_empty_file_ops;
  56 extern const struct inode_operations ntfs_empty_inode_ops;
  57 
  58 extern const struct export_operations ntfs_export_ops;
  59 
  60 /**
  61  * NTFS_SB - return the ntfs volume given a vfs super block
  62  * @sb:         VFS super block
  63  *
  64  * NTFS_SB() returns the ntfs volume associated with the VFS super block @sb.
  65  */
  66 static inline ntfs_volume *NTFS_SB(struct super_block *sb)
  67 {
  68         return sb->s_fs_info;
  69 }
  70 
  71 /* Declarations of functions and global variables. */
  72 
  73 /* From fs/ntfs/compress.c */
  74 extern int ntfs_read_compressed_block(struct page *page);
  75 extern int allocate_compression_buffers(void);
  76 extern void free_compression_buffers(void);
  77 
  78 /* From fs/ntfs/super.c */
  79 #define default_upcase_len 0x10000
  80 extern struct mutex ntfs_lock;
  81 
  82 typedef struct {
  83         int val;
  84         char *str;
  85 } option_t;
  86 extern const option_t on_errors_arr[];
  87 
  88 /* From fs/ntfs/mst.c */
  89 extern int post_read_mst_fixup(NTFS_RECORD *b, const u32 size);
  90 extern int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size);
  91 extern void post_write_mst_fixup(NTFS_RECORD *b);
  92 
  93 /* From fs/ntfs/unistr.c */
  94 extern bool ntfs_are_names_equal(const ntfschar *s1, size_t s1_len,
  95                 const ntfschar *s2, size_t s2_len,
  96                 const IGNORE_CASE_BOOL ic,
  97                 const ntfschar *upcase, const u32 upcase_size);
  98 extern int ntfs_collate_names(const ntfschar *name1, const u32 name1_len,
  99                 const ntfschar *name2, const u32 name2_len,
 100                 const int err_val, const IGNORE_CASE_BOOL ic,
 101                 const ntfschar *upcase, const u32 upcase_len);
 102 extern int ntfs_ucsncmp(const ntfschar *s1, const ntfschar *s2, size_t n);
 103 extern int ntfs_ucsncasecmp(const ntfschar *s1, const ntfschar *s2, size_t n,
 104                 const ntfschar *upcase, const u32 upcase_size);
 105 extern void ntfs_upcase_name(ntfschar *name, u32 name_len,
 106                 const ntfschar *upcase, const u32 upcase_len);
 107 extern void ntfs_file_upcase_value(FILE_NAME_ATTR *file_name_attr,
 108                 const ntfschar *upcase, const u32 upcase_len);
 109 extern int ntfs_file_compare_values(FILE_NAME_ATTR *file_name_attr1,
 110                 FILE_NAME_ATTR *file_name_attr2,
 111                 const int err_val, const IGNORE_CASE_BOOL ic,
 112                 const ntfschar *upcase, const u32 upcase_len);
 113 extern int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
 114                 const int ins_len, ntfschar **outs);
 115 extern int ntfs_ucstonls(const ntfs_volume *vol, const ntfschar *ins,
 116                 const int ins_len, unsigned char **outs, int outs_len);
 117 
 118 /* From fs/ntfs/upcase.c */
 119 extern ntfschar *generate_default_upcase(void);
 120 
 121 static inline int ntfs_ffs(int x)
 122 {
 123         int r = 1;
 124 
 125         if (!x)
 126                 return 0;
 127         if (!(x & 0xffff)) {
 128                 x >>= 16;
 129                 r += 16;
 130         }
 131         if (!(x & 0xff)) {
 132                 x >>= 8;
 133                 r += 8;
 134         }
 135         if (!(x & 0xf)) {
 136                 x >>= 4;
 137                 r += 4;
 138         }
 139         if (!(x & 3)) {
 140                 x >>= 2;
 141                 r += 2;
 142         }
 143         if (!(x & 1)) {
 144                 x >>= 1;
 145                 r += 1;
 146         }
 147         return r;
 148 }
 149 
 150 #endif /* _LINUX_NTFS_H */