2 * ntfs.h - Defines for NTFS Linux kernel driver. Part of the Linux-NTFS
5 * Copyright (c) 2001-2004 Anton Altaparmakov.
6 * Copyright (C) 2002 Richard Russon.
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.
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.
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
27 #include <linux/kernel.h>
28 #include <linux/module.h>
29 #include <linux/compiler.h>
31 #include <linux/buffer_head.h>
32 #include <linux/nls.h>
33 #include <linux/pagemap.h>
34 #include <linux/smp.h>
35 #include <asm/atomic.h>
48 NTFS_BLOCK_SIZE = 512,
49 NTFS_BLOCK_SIZE_BITS = 9,
50 NTFS_SB_MAGIC = 0x5346544e, /* 'NTFS' */
51 NTFS_MAX_NAME_LEN = 255,
54 /* Global variables. */
56 /* Slab caches (from super.c). */
57 extern kmem_cache_t *ntfs_name_cache;
58 extern kmem_cache_t *ntfs_inode_cache;
59 extern kmem_cache_t *ntfs_big_inode_cache;
60 extern kmem_cache_t *ntfs_attr_ctx_cache;
62 /* The various operations structs defined throughout the driver files. */
63 extern struct super_operations ntfs_sops;
64 extern struct super_operations ntfs_mount_sops;
66 extern struct address_space_operations ntfs_aops;
67 extern struct address_space_operations ntfs_mft_aops;
69 extern struct file_operations ntfs_file_ops;
70 extern struct inode_operations ntfs_file_inode_ops;
72 extern struct file_operations ntfs_dir_ops;
73 extern struct inode_operations ntfs_dir_inode_ops;
75 extern struct file_operations ntfs_empty_file_ops;
76 extern struct inode_operations ntfs_empty_inode_ops;
78 /* Generic macros to convert pointers to values and vice versa. */
80 #define p2n(p) ((ptrdiff_t)((ptrdiff_t*)(p)))
83 #define n2p(p) ((ptrdiff_t*)((ptrdiff_t)(p)))
87 * NTFS_SB - return the ntfs volume given a vfs super block
88 * @sb: VFS super block
90 * NTFS_SB() returns the ntfs volume associated with the VFS super block @sb.
92 static inline ntfs_volume *NTFS_SB(struct super_block *sb)
98 * ntfs_unmap_page - release a page that was mapped using ntfs_map_page()
99 * @page: the page to release
101 * Unpin, unmap and release a page that was obtained from ntfs_map_page().
103 static inline void ntfs_unmap_page(struct page *page)
106 page_cache_release(page);
110 * ntfs_map_page - map a page into accessible memory, reading it if necessary
111 * @mapping: address space for which to obtain the page
112 * @index: index into the page cache for @mapping of the page to map
114 * Read a page from the page cache of the address space @mapping at position
115 * @index, where @index is in units of PAGE_CACHE_SIZE, and not in bytes.
117 * If the page is not in memory it is loaded from disk first using the readpage
118 * method defined in the address space operations of @mapping and the page is
119 * added to the page cache of @mapping in the process.
121 * If the page is in high memory it is mapped into memory directly addressible
124 * Finally the page count is incremented, thus pinning the page into place.
126 * The above means that page_address(page) can be used on all pages obtained
127 * with ntfs_map_page() to get the kernel virtual address of the page.
129 * When finished with the page, the caller has to call ntfs_unmap_page() to
130 * unpin, unmap and release the page.
132 * Note this does not grant exclusive access. If such is desired, the caller
133 * must provide it independently of the ntfs_{un}map_page() calls by using
134 * a {rw_}semaphore or other means of serialization. A spin lock cannot be
135 * used as ntfs_map_page() can block.
137 * The unlocked and uptodate page is returned on success or an encoded error
138 * on failure. Caller has to test for error using the IS_ERR() macro on the
139 * return value. If that evaluates to TRUE, the negative error code can be
140 * obtained using PTR_ERR() on the return value of ntfs_map_page().
142 static inline struct page *ntfs_map_page(struct address_space *mapping,
145 struct page *page = read_cache_page(mapping, index,
146 (filler_t*)mapping->a_ops->readpage, NULL);
149 wait_on_page_locked(page);
151 if (PageUptodate(page) && !PageError(page))
153 ntfs_unmap_page(page);
154 return ERR_PTR(-EIO);
159 /* Declarations of functions and global variables. */
161 /* From fs/ntfs/compress.c */
162 extern int ntfs_read_compressed_block(struct page *page);
164 /* From fs/ntfs/super.c */
165 #define default_upcase_len 0x10000
166 extern wchar_t *default_upcase;
167 extern unsigned long ntfs_nr_upcase_users;
168 extern unsigned long ntfs_nr_mounts;
169 extern struct semaphore ntfs_lock;
175 extern const option_t on_errors_arr[];
177 /* From fs/ntfs/compress.c */
178 extern int allocate_compression_buffers(void);
179 extern void free_compression_buffers(void);
181 /* From fs/ntfs/mst.c */
182 extern int post_read_mst_fixup(NTFS_RECORD *b, const u32 size);
183 extern int pre_write_mst_fixup(NTFS_RECORD *b, const u32 size);
184 extern void post_write_mst_fixup(NTFS_RECORD *b);
186 /* From fs/ntfs/unistr.c */
187 extern BOOL ntfs_are_names_equal(const uchar_t *s1, size_t s1_len,
188 const uchar_t *s2, size_t s2_len,
189 const IGNORE_CASE_BOOL ic,
190 const uchar_t *upcase, const u32 upcase_size);
191 extern int ntfs_collate_names(const uchar_t *name1, const u32 name1_len,
192 const uchar_t *name2, const u32 name2_len,
193 const int err_val, const IGNORE_CASE_BOOL ic,
194 const uchar_t *upcase, const u32 upcase_len);
195 extern int ntfs_ucsncmp(const uchar_t *s1, const uchar_t *s2, size_t n);
196 extern int ntfs_ucsncasecmp(const uchar_t *s1, const uchar_t *s2, size_t n,
197 const uchar_t *upcase, const u32 upcase_size);
198 extern void ntfs_upcase_name(uchar_t *name, u32 name_len,
199 const uchar_t *upcase, const u32 upcase_len);
200 extern void ntfs_file_upcase_value(FILE_NAME_ATTR *file_name_attr,
201 const uchar_t *upcase, const u32 upcase_len);
202 extern int ntfs_file_compare_values(FILE_NAME_ATTR *file_name_attr1,
203 FILE_NAME_ATTR *file_name_attr2,
204 const int err_val, const IGNORE_CASE_BOOL ic,
205 const uchar_t *upcase, const u32 upcase_len);
206 extern int ntfs_nlstoucs(const ntfs_volume *vol, const char *ins,
207 const int ins_len, uchar_t **outs);
208 extern int ntfs_ucstonls(const ntfs_volume *vol, const uchar_t *ins,
209 const int ins_len, unsigned char **outs, int outs_len);
211 /* From fs/ntfs/upcase.c */
212 extern uchar_t *generate_default_upcase(void);
214 #endif /* _LINUX_NTFS_H */