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1 | #include <linux/fs.h> |
2 | #include <linux/buffer_head.h> |
3 | #include <linux/exportfs.h> |
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 | int s_rock_offset; /* offset of SUSP fields within SU area */ |
39 | unsigned char s_joliet_level; |
40 | unsigned char s_mapping; |
41 | unsigned int s_high_sierra:1; |
42 | unsigned int s_rock:2; |
43 | unsigned int s_utf8:1; |
44 | unsigned int s_cruft:1; /* Broken disks with high byte of length |
45 | * containing junk */ |
46 | unsigned int s_nocompress:1; |
47 | unsigned int s_hide:1; |
48 | unsigned int s_showassoc:1; |
49 | unsigned int s_overriderockperm:1; |
50 | unsigned int s_uid_set:1; |
51 | unsigned int s_gid_set:1; |
52 | |
53 | mode_t s_fmode; |
54 | mode_t s_dmode; |
55 | gid_t s_gid; |
56 | uid_t s_uid; |
57 | struct nls_table *s_nls_iocharset; /* Native language support table */ |
58 | struct mutex s_mutex; /* replaces BKL, please remove if possible */ |
59 | }; |
60 | |
61 | #define ISOFS_INVALID_MODE ((mode_t) -1) |
62 | |
63 | static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb) |
64 | { |
65 | return sb->s_fs_info; |
66 | } |
67 | |
68 | static inline struct iso_inode_info *ISOFS_I(struct inode *inode) |
69 | { |
70 | return container_of(inode, struct iso_inode_info, vfs_inode); |
71 | } |
72 | |
73 | static inline int isonum_711(char *p) |
74 | { |
75 | return *(u8 *)p; |
76 | } |
77 | static inline int isonum_712(char *p) |
78 | { |
79 | return *(s8 *)p; |
80 | } |
81 | static inline unsigned int isonum_721(char *p) |
82 | { |
83 | return get_unaligned_le16(p); |
84 | } |
85 | static inline unsigned int isonum_722(char *p) |
86 | { |
87 | return get_unaligned_be16(p); |
88 | } |
89 | static inline unsigned int isonum_723(char *p) |
90 | { |
91 | /* Ignore bigendian datum due to broken mastering programs */ |
92 | return get_unaligned_le16(p); |
93 | } |
94 | static inline unsigned int isonum_731(char *p) |
95 | { |
96 | return get_unaligned_le32(p); |
97 | } |
98 | static inline unsigned int isonum_732(char *p) |
99 | { |
100 | return get_unaligned_be32(p); |
101 | } |
102 | static inline unsigned int isonum_733(char *p) |
103 | { |
104 | /* Ignore bigendian datum due to broken mastering programs */ |
105 | return get_unaligned_le32(p); |
106 | } |
107 | extern int iso_date(char *, int); |
108 | |
109 | struct inode; /* To make gcc happy */ |
110 | |
111 | extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *); |
112 | extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *); |
113 | extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *); |
114 | |
115 | int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *); |
116 | int get_acorn_filename(struct iso_directory_record *, char *, struct inode *); |
117 | |
118 | extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *); |
119 | extern struct buffer_head *isofs_bread(struct inode *, sector_t); |
120 | extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long); |
121 | |
122 | extern struct inode *isofs_iget(struct super_block *sb, |
123 | unsigned long block, |
124 | unsigned long offset); |
125 | |
126 | /* Because the inode number is no longer relevant to finding the |
127 | * underlying meta-data for an inode, we are free to choose a more |
128 | * convenient 32-bit number as the inode number. The inode numbering |
129 | * scheme was recommended by Sergey Vlasov and Eric Lammerts. */ |
130 | static inline unsigned long isofs_get_ino(unsigned long block, |
131 | unsigned long offset, |
132 | unsigned long bufbits) |
133 | { |
134 | return (block << (bufbits - 5)) | (offset >> 5); |
135 | } |
136 | |
137 | /* Every directory can have many redundant directory entries scattered |
138 | * throughout the directory tree. First there is the directory entry |
139 | * with the name of the directory stored in the parent directory. |
140 | * Then, there is the "." directory entry stored in the directory |
141 | * itself. Finally, there are possibly many ".." directory entries |
142 | * stored in all the subdirectories. |
143 | * |
144 | * In order for the NFS get_parent() method to work and for the |
145 | * general consistency of the dcache, we need to make sure the |
146 | * "i_iget5_block" and "i_iget5_offset" all point to exactly one of |
147 | * the many redundant entries for each directory. We normalize the |
148 | * block and offset by always making them point to the "." directory. |
149 | * |
150 | * Notice that we do not use the entry for the directory with the name |
151 | * that is located in the parent directory. Even though choosing this |
152 | * first directory is more natural, it is much easier to find the "." |
153 | * entry in the NFS get_parent() method because it is implicitly |
154 | * encoded in the "extent + ext_attr_length" fields of _all_ the |
155 | * redundant entries for the directory. Thus, it can always be |
156 | * reached regardless of which directory entry you have in hand. |
157 | * |
158 | * This works because the "." entry is simply the first directory |
159 | * record when you start reading the file that holds all the directory |
160 | * records, and this file starts at "extent + ext_attr_length" blocks. |
161 | * Because the "." entry is always the first entry listed in the |
162 | * directories file, the normalized "offset" value is always 0. |
163 | * |
164 | * You should pass the directory entry in "de". On return, "block" |
165 | * and "offset" will hold normalized values. Only directories are |
166 | * affected making it safe to call even for non-directory file |
167 | * types. */ |
168 | static inline void |
169 | isofs_normalize_block_and_offset(struct iso_directory_record* de, |
170 | unsigned long *block, |
171 | unsigned long *offset) |
172 | { |
173 | /* Only directories are normalized. */ |
174 | if (de->flags[0] & 2) { |
175 | *offset = 0; |
176 | *block = (unsigned long)isonum_733(de->extent) |
177 | + (unsigned long)isonum_711(de->ext_attr_length); |
178 | } |
179 | } |
180 | |
181 | extern const struct inode_operations isofs_dir_inode_operations; |
182 | extern const struct file_operations isofs_dir_operations; |
183 | extern const struct address_space_operations isofs_symlink_aops; |
184 | extern const struct export_operations isofs_export_ops; |
185 |
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