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 umode_t s_fmode; 54 umode_t s_dmode; 55 kgid_t s_gid; 56 kuid_t s_uid; 57 struct nls_table *s_nls_iocharset; /* Native language support table */ 58 }; 59 60 #define ISOFS_INVALID_MODE ((umode_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 *, int relocated); 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 *, unsigned int flags); 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 struct inode *__isofs_iget(struct super_block *sb, 122 unsigned long block, 123 unsigned long offset, 124 int relocated); 125 126 static inline struct inode *isofs_iget(struct super_block *sb, 127 unsigned long block, 128 unsigned long offset) 129 { 130 return __isofs_iget(sb, block, offset, 0); 131 } 132 133 static inline struct inode *isofs_iget_reloc(struct super_block *sb, 134 unsigned long block, 135 unsigned long offset) 136 { 137 return __isofs_iget(sb, block, offset, 1); 138 } 139 140 /* Because the inode number is no longer relevant to finding the 141 * underlying meta-data for an inode, we are free to choose a more 142 * convenient 32-bit number as the inode number. The inode numbering 143 * scheme was recommended by Sergey Vlasov and Eric Lammerts. */ 144 static inline unsigned long isofs_get_ino(unsigned long block, 145 unsigned long offset, 146 unsigned long bufbits) 147 { 148 return (block << (bufbits - 5)) | (offset >> 5); 149 } 150 151 /* Every directory can have many redundant directory entries scattered 152 * throughout the directory tree. First there is the directory entry 153 * with the name of the directory stored in the parent directory. 154 * Then, there is the "." directory entry stored in the directory 155 * itself. Finally, there are possibly many ".." directory entries 156 * stored in all the subdirectories. 157 * 158 * In order for the NFS get_parent() method to work and for the 159 * general consistency of the dcache, we need to make sure the 160 * "i_iget5_block" and "i_iget5_offset" all point to exactly one of 161 * the many redundant entries for each directory. We normalize the 162 * block and offset by always making them point to the "." directory. 163 * 164 * Notice that we do not use the entry for the directory with the name 165 * that is located in the parent directory. Even though choosing this 166 * first directory is more natural, it is much easier to find the "." 167 * entry in the NFS get_parent() method because it is implicitly 168 * encoded in the "extent + ext_attr_length" fields of _all_ the 169 * redundant entries for the directory. Thus, it can always be 170 * reached regardless of which directory entry you have in hand. 171 * 172 * This works because the "." entry is simply the first directory 173 * record when you start reading the file that holds all the directory 174 * records, and this file starts at "extent + ext_attr_length" blocks. 175 * Because the "." entry is always the first entry listed in the 176 * directories file, the normalized "offset" value is always 0. 177 * 178 * You should pass the directory entry in "de". On return, "block" 179 * and "offset" will hold normalized values. Only directories are 180 * affected making it safe to call even for non-directory file 181 * types. */ 182 static inline void 183 isofs_normalize_block_and_offset(struct iso_directory_record* de, 184 unsigned long *block, 185 unsigned long *offset) 186 { 187 /* Only directories are normalized. */ 188 if (de->flags[0] & 2) { 189 *offset = 0; 190 *block = (unsigned long)isonum_733(de->extent) 191 + (unsigned long)isonum_711(de->ext_attr_length); 192 } 193 } 194 195 extern const struct inode_operations isofs_dir_inode_operations; 196 extern const struct file_operations isofs_dir_operations; 197 extern const struct address_space_operations isofs_symlink_aops; 198 extern const struct export_operations isofs_export_ops; 199