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