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 */ 191