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 unsigned char s_hide; 51 unsigned char s_showassoc; 52 53 mode_t s_mode; 54 gid_t s_gid; 55 uid_t s_uid; 56 struct nls_table *s_nls_iocharset; /* Native language support table */ 57 }; 58 59 static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb) 60 { 61 return sb->s_fs_info; 62 } 63 64 static inline struct iso_inode_info *ISOFS_I(struct inode *inode) 65 { 66 return container_of(inode, struct iso_inode_info, vfs_inode); 67 } 68 69 static inline int isonum_711(char *p) 70 { 71 return *(u8 *)p; 72 } 73 static inline int isonum_712(char *p) 74 { 75 return *(s8 *)p; 76 } 77 static inline unsigned int isonum_721(char *p) 78 { 79 return le16_to_cpu(get_unaligned((__le16 *)p)); 80 } 81 static inline unsigned int isonum_722(char *p) 82 { 83 return be16_to_cpu(get_unaligned((__le16 *)p)); 84 } 85 static inline unsigned int isonum_723(char *p) 86 { 87 /* Ignore bigendian datum due to broken mastering programs */ 88 return le16_to_cpu(get_unaligned((__le16 *)p)); 89 } 90 static inline unsigned int isonum_731(char *p) 91 { 92 return le32_to_cpu(get_unaligned((__le32 *)p)); 93 } 94 static inline unsigned int isonum_732(char *p) 95 { 96 return be32_to_cpu(get_unaligned((__le32 *)p)); 97 } 98 static inline unsigned int isonum_733(char *p) 99 { 100 /* Ignore bigendian datum due to broken mastering programs */ 101 return le32_to_cpu(get_unaligned((__le32 *)p)); 102 } 103 extern int iso_date(char *, int); 104 105 struct inode; /* To make gcc happy */ 106 107 extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *); 108 extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *); 109 extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *); 110 111 int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *); 112 int get_acorn_filename(struct iso_directory_record *, char *, struct inode *); 113 114 extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *); 115 extern struct buffer_head *isofs_bread(struct inode *, sector_t); 116 extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long); 117 118 extern struct inode *isofs_iget(struct super_block *sb, 119 unsigned long block, 120 unsigned long offset); 121 122 /* Because the inode number is no longer relevant to finding the 123 * underlying meta-data for an inode, we are free to choose a more 124 * convenient 32-bit number as the inode number. The inode numbering 125 * scheme was recommended by Sergey Vlasov and Eric Lammerts. */ 126 static inline unsigned long isofs_get_ino(unsigned long block, 127 unsigned long offset, 128 unsigned long bufbits) 129 { 130 return (block << (bufbits - 5)) | (offset >> 5); 131 } 132 133 /* Every directory can have many redundant directory entries scattered 134 * throughout the directory tree. First there is the directory entry 135 * with the name of the directory stored in the parent directory. 136 * Then, there is the "." directory entry stored in the directory 137 * itself. Finally, there are possibly many ".." directory entries 138 * stored in all the subdirectories. 139 * 140 * In order for the NFS get_parent() method to work and for the 141 * general consistency of the dcache, we need to make sure the 142 * "i_iget5_block" and "i_iget5_offset" all point to exactly one of 143 * the many redundant entries for each directory. We normalize the 144 * block and offset by always making them point to the "." directory. 145 * 146 * Notice that we do not use the entry for the directory with the name 147 * that is located in the parent directory. Even though choosing this 148 * first directory is more natural, it is much easier to find the "." 149 * entry in the NFS get_parent() method because it is implicitly 150 * encoded in the "extent + ext_attr_length" fields of _all_ the 151 * redundant entries for the directory. Thus, it can always be 152 * reached regardless of which directory entry you have in hand. 153 * 154 * This works because the "." entry is simply the first directory 155 * record when you start reading the file that holds all the directory 156 * records, and this file starts at "extent + ext_attr_length" blocks. 157 * Because the "." entry is always the first entry listed in the 158 * directories file, the normalized "offset" value is always 0. 159 * 160 * You should pass the directory entry in "de". On return, "block" 161 * and "offset" will hold normalized values. Only directories are 162 * affected making it safe to call even for non-directory file 163 * types. */ 164 static inline void 165 isofs_normalize_block_and_offset(struct iso_directory_record* de, 166 unsigned long *block, 167 unsigned long *offset) 168 { 169 /* Only directories are normalized. */ 170 if (de->flags[0] & 2) { 171 *offset = 0; 172 *block = (unsigned long)isonum_733(de->extent) 173 + (unsigned long)isonum_711(de->ext_attr_length); 174 } 175 } 176 177 extern const struct inode_operations isofs_dir_inode_operations; 178 extern const struct file_operations isofs_dir_operations; 179 extern const struct address_space_operations isofs_symlink_aops; 180 extern struct export_operations isofs_export_ops; 181