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Linux/fs/ntfs/ntfs.h

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  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 */
151 

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