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94f2f715 AV |
1 | #include <linux/fs.h> |
2 | #include <linux/buffer_head.h> | |
a5694255 | 3 | #include <linux/exportfs.h> |
94f2f715 AV |
4 | #include <linux/iso_fs.h> |
5 | #include <asm/unaligned.h> | |
6 | ||
7 | enum isofs_file_format { | |
8 | isofs_file_normal = 0, | |
9 | isofs_file_sparse = 1, | |
10 | isofs_file_compressed = 2, | |
11 | }; | |
12 | ||
13 | /* | |
14 | * iso fs inode data in memory | |
15 | */ | |
16 | struct iso_inode_info { | |
17 | unsigned long i_iget5_block; | |
18 | unsigned long i_iget5_offset; | |
19 | unsigned int i_first_extent; | |
20 | unsigned char i_file_format; | |
21 | unsigned char i_format_parm[3]; | |
22 | unsigned long i_next_section_block; | |
23 | unsigned long i_next_section_offset; | |
24 | off_t i_section_size; | |
25 | struct inode vfs_inode; | |
26 | }; | |
27 | ||
28 | /* | |
29 | * iso9660 super-block data in memory | |
30 | */ | |
31 | struct isofs_sb_info { | |
32 | unsigned long s_ninodes; | |
33 | unsigned long s_nzones; | |
34 | unsigned long s_firstdatazone; | |
35 | unsigned long s_log_zone_size; | |
36 | unsigned long s_max_size; | |
37 | ||
38 | unsigned char s_high_sierra; /* A simple flag */ | |
39 | unsigned char s_mapping; | |
40 | int s_rock_offset; /* offset of SUSP fields within SU area */ | |
41 | unsigned char s_rock; | |
42 | unsigned char s_joliet_level; | |
43 | unsigned char s_utf8; | |
44 | unsigned char s_cruft; /* Broken disks with high | |
45 | byte of length containing | |
46 | junk */ | |
47 | unsigned char s_unhide; | |
48 | unsigned char s_nosuid; | |
49 | unsigned char s_nodev; | |
50 | unsigned char s_nocompress; | |
9769f4eb JW |
51 | unsigned char s_hide; |
52 | unsigned char s_showassoc; | |
94f2f715 | 53 | |
9b7880e7 JK |
54 | mode_t s_fmode; |
55 | mode_t s_dmode; | |
94f2f715 AV |
56 | gid_t s_gid; |
57 | uid_t s_uid; | |
58 | struct nls_table *s_nls_iocharset; /* Native language support table */ | |
59 | }; | |
60 | ||
61 | static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb) | |
62 | { | |
63 | return sb->s_fs_info; | |
64 | } | |
65 | ||
66 | static inline struct iso_inode_info *ISOFS_I(struct inode *inode) | |
67 | { | |
68 | return container_of(inode, struct iso_inode_info, vfs_inode); | |
69 | } | |
70 | ||
71 | static inline int isonum_711(char *p) | |
72 | { | |
73 | return *(u8 *)p; | |
74 | } | |
75 | static inline int isonum_712(char *p) | |
76 | { | |
77 | return *(s8 *)p; | |
78 | } | |
79 | static inline unsigned int isonum_721(char *p) | |
80 | { | |
58d485d4 | 81 | return get_unaligned_le16(p); |
94f2f715 AV |
82 | } |
83 | static inline unsigned int isonum_722(char *p) | |
84 | { | |
58d485d4 | 85 | return get_unaligned_be16(p); |
94f2f715 AV |
86 | } |
87 | static inline unsigned int isonum_723(char *p) | |
88 | { | |
89 | /* Ignore bigendian datum due to broken mastering programs */ | |
58d485d4 | 90 | return get_unaligned_le16(p); |
94f2f715 AV |
91 | } |
92 | static inline unsigned int isonum_731(char *p) | |
93 | { | |
58d485d4 | 94 | return get_unaligned_le32(p); |
94f2f715 AV |
95 | } |
96 | static inline unsigned int isonum_732(char *p) | |
97 | { | |
58d485d4 | 98 | return get_unaligned_be32(p); |
94f2f715 AV |
99 | } |
100 | static inline unsigned int isonum_733(char *p) | |
101 | { | |
102 | /* Ignore bigendian datum due to broken mastering programs */ | |
58d485d4 | 103 | return get_unaligned_le32(p); |
94f2f715 AV |
104 | } |
105 | extern int iso_date(char *, int); | |
106 | ||
107 | struct inode; /* To make gcc happy */ | |
108 | ||
109 | extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *); | |
110 | extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *); | |
111 | extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *); | |
112 | ||
113 | int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *); | |
114 | int get_acorn_filename(struct iso_directory_record *, char *, struct inode *); | |
115 | ||
116 | extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *); | |
117 | extern struct buffer_head *isofs_bread(struct inode *, sector_t); | |
118 | extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long); | |
119 | ||
120 | extern struct inode *isofs_iget(struct super_block *sb, | |
121 | unsigned long block, | |
122 | unsigned long offset); | |
123 | ||
124 | /* Because the inode number is no longer relevant to finding the | |
125 | * underlying meta-data for an inode, we are free to choose a more | |
126 | * convenient 32-bit number as the inode number. The inode numbering | |
127 | * scheme was recommended by Sergey Vlasov and Eric Lammerts. */ | |
128 | static inline unsigned long isofs_get_ino(unsigned long block, | |
129 | unsigned long offset, | |
130 | unsigned long bufbits) | |
131 | { | |
132 | return (block << (bufbits - 5)) | (offset >> 5); | |
133 | } | |
134 | ||
135 | /* Every directory can have many redundant directory entries scattered | |
136 | * throughout the directory tree. First there is the directory entry | |
137 | * with the name of the directory stored in the parent directory. | |
138 | * Then, there is the "." directory entry stored in the directory | |
139 | * itself. Finally, there are possibly many ".." directory entries | |
140 | * stored in all the subdirectories. | |
141 | * | |
142 | * In order for the NFS get_parent() method to work and for the | |
143 | * general consistency of the dcache, we need to make sure the | |
144 | * "i_iget5_block" and "i_iget5_offset" all point to exactly one of | |
145 | * the many redundant entries for each directory. We normalize the | |
146 | * block and offset by always making them point to the "." directory. | |
147 | * | |
148 | * Notice that we do not use the entry for the directory with the name | |
149 | * that is located in the parent directory. Even though choosing this | |
150 | * first directory is more natural, it is much easier to find the "." | |
151 | * entry in the NFS get_parent() method because it is implicitly | |
152 | * encoded in the "extent + ext_attr_length" fields of _all_ the | |
153 | * redundant entries for the directory. Thus, it can always be | |
154 | * reached regardless of which directory entry you have in hand. | |
155 | * | |
156 | * This works because the "." entry is simply the first directory | |
157 | * record when you start reading the file that holds all the directory | |
158 | * records, and this file starts at "extent + ext_attr_length" blocks. | |
159 | * Because the "." entry is always the first entry listed in the | |
160 | * directories file, the normalized "offset" value is always 0. | |
161 | * | |
162 | * You should pass the directory entry in "de". On return, "block" | |
163 | * and "offset" will hold normalized values. Only directories are | |
164 | * affected making it safe to call even for non-directory file | |
165 | * types. */ | |
166 | static inline void | |
167 | isofs_normalize_block_and_offset(struct iso_directory_record* de, | |
168 | unsigned long *block, | |
169 | unsigned long *offset) | |
170 | { | |
171 | /* Only directories are normalized. */ | |
172 | if (de->flags[0] & 2) { | |
173 | *offset = 0; | |
174 | *block = (unsigned long)isonum_733(de->extent) | |
175 | + (unsigned long)isonum_711(de->ext_attr_length); | |
176 | } | |
177 | } | |
178 | ||
92e1d5be | 179 | extern const struct inode_operations isofs_dir_inode_operations; |
4b6f5d20 | 180 | extern const struct file_operations isofs_dir_operations; |
f5e54d6e | 181 | extern const struct address_space_operations isofs_symlink_aops; |
39655164 | 182 | extern const struct export_operations isofs_export_ops; |