Gitiles
Code Review Sign In
review.shift-gmbh.com / SHIFTPHONES / kernel / common / 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 / . / include / linux / iso_fs.h
blob: 099039d4b10da9ec8dab7fad3a82ae1881ed9713 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame^]1
2#ifndef _ISOFS_FS_H
3#define _ISOFS_FS_H
4
5#include <linux/types.h>
6/*
7 * The isofs filesystem constants/structures
8 */
9
10/* This part borrowed from the bsd386 isofs */
11#define ISODCL(from, to) (to - from + 1)
12
13struct iso_volume_descriptor {
14 char type[ISODCL(1,1)]; /* 711 */
15 char id[ISODCL(2,6)];
16 char version[ISODCL(7,7)];
17 char data[ISODCL(8,2048)];
18};
19
20/* volume descriptor types */
21#define ISO_VD_PRIMARY 1
22#define ISO_VD_SUPPLEMENTARY 2
23#define ISO_VD_END 255
24
25#define ISO_STANDARD_ID "CD001"
26
27struct iso_primary_descriptor {
28 char type [ISODCL ( 1, 1)]; /* 711 */
29 char id [ISODCL ( 2, 6)];
30 char version [ISODCL ( 7, 7)]; /* 711 */
31 char unused1 [ISODCL ( 8, 8)];
32 char system_id [ISODCL ( 9, 40)]; /* achars */
33 char volume_id [ISODCL ( 41, 72)]; /* dchars */
34 char unused2 [ISODCL ( 73, 80)];
35 char volume_space_size [ISODCL ( 81, 88)]; /* 733 */
36 char unused3 [ISODCL ( 89, 120)];
37 char volume_set_size [ISODCL (121, 124)]; /* 723 */
38 char volume_sequence_number [ISODCL (125, 128)]; /* 723 */
39 char logical_block_size [ISODCL (129, 132)]; /* 723 */
40 char path_table_size [ISODCL (133, 140)]; /* 733 */
41 char type_l_path_table [ISODCL (141, 144)]; /* 731 */
42 char opt_type_l_path_table [ISODCL (145, 148)]; /* 731 */
43 char type_m_path_table [ISODCL (149, 152)]; /* 732 */
44 char opt_type_m_path_table [ISODCL (153, 156)]; /* 732 */
45 char root_directory_record [ISODCL (157, 190)]; /* 9.1 */
46 char volume_set_id [ISODCL (191, 318)]; /* dchars */
47 char publisher_id [ISODCL (319, 446)]; /* achars */
48 char preparer_id [ISODCL (447, 574)]; /* achars */
49 char application_id [ISODCL (575, 702)]; /* achars */
50 char copyright_file_id [ISODCL (703, 739)]; /* 7.5 dchars */
51 char abstract_file_id [ISODCL (740, 776)]; /* 7.5 dchars */
52 char bibliographic_file_id [ISODCL (777, 813)]; /* 7.5 dchars */
53 char creation_date [ISODCL (814, 830)]; /* 8.4.26.1 */
54 char modification_date [ISODCL (831, 847)]; /* 8.4.26.1 */
55 char expiration_date [ISODCL (848, 864)]; /* 8.4.26.1 */
56 char effective_date [ISODCL (865, 881)]; /* 8.4.26.1 */
57 char file_structure_version [ISODCL (882, 882)]; /* 711 */
58 char unused4 [ISODCL (883, 883)];
59 char application_data [ISODCL (884, 1395)];
60 char unused5 [ISODCL (1396, 2048)];
61};
62
63/* Almost the same as the primary descriptor but two fields are specified */
64struct iso_supplementary_descriptor {
65 char type [ISODCL ( 1, 1)]; /* 711 */
66 char id [ISODCL ( 2, 6)];
67 char version [ISODCL ( 7, 7)]; /* 711 */
68 char flags [ISODCL ( 8, 8)]; /* 853 */
69 char system_id [ISODCL ( 9, 40)]; /* achars */
70 char volume_id [ISODCL ( 41, 72)]; /* dchars */
71 char unused2 [ISODCL ( 73, 80)];
72 char volume_space_size [ISODCL ( 81, 88)]; /* 733 */
73 char escape [ISODCL ( 89, 120)]; /* 856 */
74 char volume_set_size [ISODCL (121, 124)]; /* 723 */
75 char volume_sequence_number [ISODCL (125, 128)]; /* 723 */
76 char logical_block_size [ISODCL (129, 132)]; /* 723 */
77 char path_table_size [ISODCL (133, 140)]; /* 733 */
78 char type_l_path_table [ISODCL (141, 144)]; /* 731 */
79 char opt_type_l_path_table [ISODCL (145, 148)]; /* 731 */
80 char type_m_path_table [ISODCL (149, 152)]; /* 732 */
81 char opt_type_m_path_table [ISODCL (153, 156)]; /* 732 */
82 char root_directory_record [ISODCL (157, 190)]; /* 9.1 */
83 char volume_set_id [ISODCL (191, 318)]; /* dchars */
84 char publisher_id [ISODCL (319, 446)]; /* achars */
85 char preparer_id [ISODCL (447, 574)]; /* achars */
86 char application_id [ISODCL (575, 702)]; /* achars */
87 char copyright_file_id [ISODCL (703, 739)]; /* 7.5 dchars */
88 char abstract_file_id [ISODCL (740, 776)]; /* 7.5 dchars */
89 char bibliographic_file_id [ISODCL (777, 813)]; /* 7.5 dchars */
90 char creation_date [ISODCL (814, 830)]; /* 8.4.26.1 */
91 char modification_date [ISODCL (831, 847)]; /* 8.4.26.1 */
92 char expiration_date [ISODCL (848, 864)]; /* 8.4.26.1 */
93 char effective_date [ISODCL (865, 881)]; /* 8.4.26.1 */
94 char file_structure_version [ISODCL (882, 882)]; /* 711 */
95 char unused4 [ISODCL (883, 883)];
96 char application_data [ISODCL (884, 1395)];
97 char unused5 [ISODCL (1396, 2048)];
98};
99
100
101#define HS_STANDARD_ID "CDROM"
102
103struct hs_volume_descriptor {
104 char foo [ISODCL ( 1, 8)]; /* 733 */
105 char type [ISODCL ( 9, 9)]; /* 711 */
106 char id [ISODCL ( 10, 14)];
107 char version [ISODCL ( 15, 15)]; /* 711 */
108 char data[ISODCL(16,2048)];
109};
110
111
112struct hs_primary_descriptor {
113 char foo [ISODCL ( 1, 8)]; /* 733 */
114 char type [ISODCL ( 9, 9)]; /* 711 */
115 char id [ISODCL ( 10, 14)];
116 char version [ISODCL ( 15, 15)]; /* 711 */
117 char unused1 [ISODCL ( 16, 16)]; /* 711 */
118 char system_id [ISODCL ( 17, 48)]; /* achars */
119 char volume_id [ISODCL ( 49, 80)]; /* dchars */
120 char unused2 [ISODCL ( 81, 88)]; /* 733 */
121 char volume_space_size [ISODCL ( 89, 96)]; /* 733 */
122 char unused3 [ISODCL ( 97, 128)]; /* 733 */
123 char volume_set_size [ISODCL (129, 132)]; /* 723 */
124 char volume_sequence_number [ISODCL (133, 136)]; /* 723 */
125 char logical_block_size [ISODCL (137, 140)]; /* 723 */
126 char path_table_size [ISODCL (141, 148)]; /* 733 */
127 char type_l_path_table [ISODCL (149, 152)]; /* 731 */
128 char unused4 [ISODCL (153, 180)]; /* 733 */
129 char root_directory_record [ISODCL (181, 214)]; /* 9.1 */
130};
131
132/* We use this to help us look up the parent inode numbers. */
133
134struct iso_path_table{
135 unsigned char name_len[2]; /* 721 */
136 char extent[4]; /* 731 */
137 char parent[2]; /* 721 */
138 char name[0];
139} __attribute__((packed));
140
141/* high sierra is identical to iso, except that the date is only 6 bytes, and
142 there is an extra reserved byte after the flags */
143
144struct iso_directory_record {
145 char length [ISODCL (1, 1)]; /* 711 */
146 char ext_attr_length [ISODCL (2, 2)]; /* 711 */
147 char extent [ISODCL (3, 10)]; /* 733 */
148 char size [ISODCL (11, 18)]; /* 733 */
149 char date [ISODCL (19, 25)]; /* 7 by 711 */
150 char flags [ISODCL (26, 26)];
151 char file_unit_size [ISODCL (27, 27)]; /* 711 */
152 char interleave [ISODCL (28, 28)]; /* 711 */
153 char volume_sequence_number [ISODCL (29, 32)]; /* 723 */
154 unsigned char name_len [ISODCL (33, 33)]; /* 711 */
155 char name [0];
156} __attribute__((packed));
157
158#define ISOFS_BLOCK_BITS 11
159#define ISOFS_BLOCK_SIZE 2048
160
161#define ISOFS_BUFFER_SIZE(INODE) ((INODE)->i_sb->s_blocksize)
162#define ISOFS_BUFFER_BITS(INODE) ((INODE)->i_sb->s_blocksize_bits)
163
164#define ISOFS_SUPER_MAGIC 0x9660
165
166#ifdef __KERNEL__
167/* Number conversion inlines, named after the section in ISO 9660
168 they correspond to. */
169
170#include <asm/byteorder.h>
171#include <asm/unaligned.h>
172#include <linux/iso_fs_i.h>
173#include <linux/iso_fs_sb.h>
174
175static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
176{
177 return sb->s_fs_info;
178}
179
180static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
181{
182 return container_of(inode, struct iso_inode_info, vfs_inode);
183}
184
185static inline int isonum_711(char *p)
186{
187 return *(u8 *)p;
188}
189static inline int isonum_712(char *p)
190{
191 return *(s8 *)p;
192}
193static inline unsigned int isonum_721(char *p)
194{
195 return le16_to_cpu(get_unaligned((__le16 *)p));
196}
197static inline unsigned int isonum_722(char *p)
198{
199 return be16_to_cpu(get_unaligned((__le16 *)p));
200}
201static inline unsigned int isonum_723(char *p)
202{
203 /* Ignore bigendian datum due to broken mastering programs */
204 return le16_to_cpu(get_unaligned((__le16 *)p));
205}
206static inline unsigned int isonum_731(char *p)
207{
208 return le32_to_cpu(get_unaligned((__le32 *)p));
209}
210static inline unsigned int isonum_732(char *p)
211{
212 return be32_to_cpu(get_unaligned((__le32 *)p));
213}
214static inline unsigned int isonum_733(char *p)
215{
216 /* Ignore bigendian datum due to broken mastering programs */
217 return le32_to_cpu(get_unaligned((__le32 *)p));
218}
219extern int iso_date(char *, int);
220
221struct inode; /* To make gcc happy */
222
223extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *);
224extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
225extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);
226
227int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
228int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);
229
230extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *);
231extern struct buffer_head *isofs_bread(struct inode *, sector_t);
232extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);
233
234extern struct inode *isofs_iget(struct super_block *sb,
235 unsigned long block,
236 unsigned long offset);
237
238/* Because the inode number is no longer relevant to finding the
239 * underlying meta-data for an inode, we are free to choose a more
240 * convenient 32-bit number as the inode number. The inode numbering
241 * scheme was recommended by Sergey Vlasov and Eric Lammerts. */
242static inline unsigned long isofs_get_ino(unsigned long block,
243 unsigned long offset,
244 unsigned long bufbits)
245{
246 return (block << (bufbits - 5)) | (offset >> 5);
247}
248
249/* Every directory can have many redundant directory entries scattered
250 * throughout the directory tree. First there is the directory entry
251 * with the name of the directory stored in the parent directory.
252 * Then, there is the "." directory entry stored in the directory
253 * itself. Finally, there are possibly many ".." directory entries
254 * stored in all the subdirectories.
255 *
256 * In order for the NFS get_parent() method to work and for the
257 * general consistency of the dcache, we need to make sure the
258 * "i_iget5_block" and "i_iget5_offset" all point to exactly one of
259 * the many redundant entries for each directory. We normalize the
260 * block and offset by always making them point to the "." directory.
261 *
262 * Notice that we do not use the entry for the directory with the name
263 * that is located in the parent directory. Even though choosing this
264 * first directory is more natural, it is much easier to find the "."
265 * entry in the NFS get_parent() method because it is implicitly
266 * encoded in the "extent + ext_attr_length" fields of _all_ the
267 * redundant entries for the directory. Thus, it can always be
268 * reached regardless of which directory entry you have in hand.
269 *
270 * This works because the "." entry is simply the first directory
271 * record when you start reading the file that holds all the directory
272 * records, and this file starts at "extent + ext_attr_length" blocks.
273 * Because the "." entry is always the first entry listed in the
274 * directories file, the normalized "offset" value is always 0.
275 *
276 * You should pass the directory entry in "de". On return, "block"
277 * and "offset" will hold normalized values. Only directories are
278 * affected making it safe to call even for non-directory file
279 * types. */
280static inline void
281isofs_normalize_block_and_offset(struct iso_directory_record* de,
282 unsigned long *block,
283 unsigned long *offset)
284{
285 /* Only directories are normalized. */
286 if (de->flags[0] & 2) {
287 *offset = 0;
288 *block = (unsigned long)isonum_733(de->extent)
289 + (unsigned long)isonum_711(de->ext_attr_length);
290 }
291}
292
293extern struct inode_operations isofs_dir_inode_operations;
294extern struct file_operations isofs_dir_operations;
295extern struct address_space_operations isofs_symlink_aops;
296extern struct export_operations isofs_export_ops;
297
298/* The following macros are used to check for memory leaks. */
299#ifdef LEAK_CHECK
300#define free_s leak_check_free_s
301#define malloc leak_check_malloc
302#define sb_bread leak_check_bread
303#define brelse leak_check_brelse
304extern void * leak_check_malloc(unsigned int size);
305extern void leak_check_free_s(void * obj, int size);
306extern struct buffer_head * leak_check_bread(struct super_block *sb, int block);
307extern void leak_check_brelse(struct buffer_head * bh);
308#endif /* LEAK_CHECK */
309
310#endif /* __KERNEL__ */
311
312#endif