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94f2f715 AV |
1 | #include <linux/fs.h> |
2 | #include <linux/buffer_head.h> | |
3 | #include <linux/iso_fs.h> | |
4 | #include <asm/unaligned.h> | |
5 | ||
6 | enum isofs_file_format { | |
7 | isofs_file_normal = 0, | |
8 | isofs_file_sparse = 1, | |
9 | isofs_file_compressed = 2, | |
10 | }; | |
11 | ||
12 | /* | |
13 | * iso fs inode data in memory | |
14 | */ | |
15 | struct iso_inode_info { | |
16 | unsigned long i_iget5_block; | |
17 | unsigned long i_iget5_offset; | |
18 | unsigned int i_first_extent; | |
19 | unsigned char i_file_format; | |
20 | unsigned char i_format_parm[3]; | |
21 | unsigned long i_next_section_block; | |
22 | unsigned long i_next_section_offset; | |
23 | off_t i_section_size; | |
24 | struct inode vfs_inode; | |
25 | }; | |
26 | ||
27 | /* | |
28 | * iso9660 super-block data in memory | |
29 | */ | |
30 | struct isofs_sb_info { | |
31 | unsigned long s_ninodes; | |
32 | unsigned long s_nzones; | |
33 | unsigned long s_firstdatazone; | |
34 | unsigned long s_log_zone_size; | |
35 | unsigned long s_max_size; | |
36 | ||
37 | unsigned char s_high_sierra; /* A simple flag */ | |
38 | unsigned char s_mapping; | |
39 | int s_rock_offset; /* offset of SUSP fields within SU area */ | |
40 | unsigned char s_rock; | |
41 | unsigned char s_joliet_level; | |
42 | unsigned char s_utf8; | |
43 | unsigned char s_cruft; /* Broken disks with high | |
44 | byte of length containing | |
45 | junk */ | |
46 | unsigned char s_unhide; | |
47 | unsigned char s_nosuid; | |
48 | unsigned char s_nodev; | |
49 | unsigned char s_nocompress; | |
50 | ||
51 | mode_t s_mode; | |
52 | gid_t s_gid; | |
53 | uid_t s_uid; | |
54 | struct nls_table *s_nls_iocharset; /* Native language support table */ | |
55 | }; | |
56 | ||
57 | static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb) | |
58 | { | |
59 | return sb->s_fs_info; | |
60 | } | |
61 | ||
62 | static inline struct iso_inode_info *ISOFS_I(struct inode *inode) | |
63 | { | |
64 | return container_of(inode, struct iso_inode_info, vfs_inode); | |
65 | } | |
66 | ||
67 | static inline int isonum_711(char *p) | |
68 | { | |
69 | return *(u8 *)p; | |
70 | } | |
71 | static inline int isonum_712(char *p) | |
72 | { | |
73 | return *(s8 *)p; | |
74 | } | |
75 | static inline unsigned int isonum_721(char *p) | |
76 | { | |
77 | return le16_to_cpu(get_unaligned((__le16 *)p)); | |
78 | } | |
79 | static inline unsigned int isonum_722(char *p) | |
80 | { | |
81 | return be16_to_cpu(get_unaligned((__le16 *)p)); | |
82 | } | |
83 | static inline unsigned int isonum_723(char *p) | |
84 | { | |
85 | /* Ignore bigendian datum due to broken mastering programs */ | |
86 | return le16_to_cpu(get_unaligned((__le16 *)p)); | |
87 | } | |
88 | static inline unsigned int isonum_731(char *p) | |
89 | { | |
90 | return le32_to_cpu(get_unaligned((__le32 *)p)); | |
91 | } | |
92 | static inline unsigned int isonum_732(char *p) | |
93 | { | |
94 | return be32_to_cpu(get_unaligned((__le32 *)p)); | |
95 | } | |
96 | static inline unsigned int isonum_733(char *p) | |
97 | { | |
98 | /* Ignore bigendian datum due to broken mastering programs */ | |
99 | return le32_to_cpu(get_unaligned((__le32 *)p)); | |
100 | } | |
101 | extern int iso_date(char *, int); | |
102 | ||
103 | struct inode; /* To make gcc happy */ | |
104 | ||
105 | extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *); | |
106 | extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *); | |
107 | extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *); | |
108 | ||
109 | int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *); | |
110 | int get_acorn_filename(struct iso_directory_record *, char *, struct inode *); | |
111 | ||
112 | extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
113 | extern struct buffer_head *isofs_bread(struct inode *, sector_t); | |
114 | extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long); | |
115 | ||
116 | extern struct inode *isofs_iget(struct super_block *sb, | |
117 | unsigned long block, | |
118 | unsigned long offset); | |
119 | ||
120 | /* Because the inode number is no longer relevant to finding the | |
121 | * underlying meta-data for an inode, we are free to choose a more | |
122 | * convenient 32-bit number as the inode number. The inode numbering | |
123 | * scheme was recommended by Sergey Vlasov and Eric Lammerts. */ | |
124 | static inline unsigned long isofs_get_ino(unsigned long block, | |
125 | unsigned long offset, | |
126 | unsigned long bufbits) | |
127 | { | |
128 | return (block << (bufbits - 5)) | (offset >> 5); | |
129 | } | |
130 | ||
131 | /* Every directory can have many redundant directory entries scattered | |
132 | * throughout the directory tree. First there is the directory entry | |
133 | * with the name of the directory stored in the parent directory. | |
134 | * Then, there is the "." directory entry stored in the directory | |
135 | * itself. Finally, there are possibly many ".." directory entries | |
136 | * stored in all the subdirectories. | |
137 | * | |
138 | * In order for the NFS get_parent() method to work and for the | |
139 | * general consistency of the dcache, we need to make sure the | |
140 | * "i_iget5_block" and "i_iget5_offset" all point to exactly one of | |
141 | * the many redundant entries for each directory. We normalize the | |
142 | * block and offset by always making them point to the "." directory. | |
143 | * | |
144 | * Notice that we do not use the entry for the directory with the name | |
145 | * that is located in the parent directory. Even though choosing this | |
146 | * first directory is more natural, it is much easier to find the "." | |
147 | * entry in the NFS get_parent() method because it is implicitly | |
148 | * encoded in the "extent + ext_attr_length" fields of _all_ the | |
149 | * redundant entries for the directory. Thus, it can always be | |
150 | * reached regardless of which directory entry you have in hand. | |
151 | * | |
152 | * This works because the "." entry is simply the first directory | |
153 | * record when you start reading the file that holds all the directory | |
154 | * records, and this file starts at "extent + ext_attr_length" blocks. | |
155 | * Because the "." entry is always the first entry listed in the | |
156 | * directories file, the normalized "offset" value is always 0. | |
157 | * | |
158 | * You should pass the directory entry in "de". On return, "block" | |
159 | * and "offset" will hold normalized values. Only directories are | |
160 | * affected making it safe to call even for non-directory file | |
161 | * types. */ | |
162 | static inline void | |
163 | isofs_normalize_block_and_offset(struct iso_directory_record* de, | |
164 | unsigned long *block, | |
165 | unsigned long *offset) | |
166 | { | |
167 | /* Only directories are normalized. */ | |
168 | if (de->flags[0] & 2) { | |
169 | *offset = 0; | |
170 | *block = (unsigned long)isonum_733(de->extent) | |
171 | + (unsigned long)isonum_711(de->ext_attr_length); | |
172 | } | |
173 | } | |
174 | ||
175 | extern struct inode_operations isofs_dir_inode_operations; | |
176 | extern struct file_operations isofs_dir_operations; | |
177 | extern struct address_space_operations isofs_symlink_aops; | |
178 | extern struct export_operations isofs_export_ops; | |
179 | ||
180 | /* The following macros are used to check for memory leaks. */ | |
181 | #ifdef LEAK_CHECK | |
182 | #define free_s leak_check_free_s | |
183 | #define malloc leak_check_malloc | |
184 | #define sb_bread leak_check_bread | |
185 | #define brelse leak_check_brelse | |
186 | extern void * leak_check_malloc(unsigned int size); | |
187 | extern void leak_check_free_s(void * obj, int size); | |
188 | extern struct buffer_head * leak_check_bread(struct super_block *sb, int block); | |
189 | extern void leak_check_brelse(struct buffer_head * bh); | |
190 | #endif /* LEAK_CHECK */ |