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 unsigned char s_high_sierra; /* A simple flag */ 39 unsigned char s_mapping; 40 int s_rock_offset; /* offset of SUSP fields within SU area */ 41 unsigned char s_rock; 42 unsigned char s_joliet_level; 43 unsigned char s_utf8; 44 unsigned char s_cruft; /* Broken disks with high 45 byte of length containing 46 junk */ 47 unsigned char s_unhide; 48 unsigned char s_nosuid; 49 unsigned char s_nodev; 50 unsigned char s_nocompress; 51 unsigned char s_hide; 52 unsigned char s_showassoc; 53 54 mode_t s_mode; 55 gid_t s_gid; 56 uid_t s_uid; 57 struct nls_table *s_nls_iocharset; /* Native language support table */ 58 }; 59 60 static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb) 61 { 62 return sb->s_fs_info; 63 } 64 65 static inline struct iso_inode_info *ISOFS_I(struct inode *inode) 66 { 67 return container_of(inode, struct iso_inode_info, vfs_inode); 68 } 69 70 static inline int isonum_711(char *p) 71 { 72 return *(u8 *)p; 73 } 74 static inline int isonum_712(char *p) 75 { 76 return *(s8 *)p; 77 } 78 static inline unsigned int isonum_721(char *p) 79 { 80 return le16_to_cpu(get_unaligned((__le16 *)p)); 81 } 82 static inline unsigned int isonum_722(char *p) 83 { 84 return be16_to_cpu(get_unaligned((__le16 *)p)); 85 } 86 static inline unsigned int isonum_723(char *p) 87 { 88 /* Ignore bigendian datum due to broken mastering programs */ 89 return le16_to_cpu(get_unaligned((__le16 *)p)); 90 } 91 static inline unsigned int isonum_731(char *p) 92 { 93 return le32_to_cpu(get_unaligned((__le32 *)p)); 94 } 95 static inline unsigned int isonum_732(char *p) 96 { 97 return be32_to_cpu(get_unaligned((__le32 *)p)); 98 } 99 static inline unsigned int isonum_733(char *p) 100 { 101 /* Ignore bigendian datum due to broken mastering programs */ 102 return le32_to_cpu(get_unaligned((__le32 *)p)); 103 } 104 extern int iso_date(char *, int); 105 106 struct inode; /* To make gcc happy */ 107 108 extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *); 109 extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *); 110 extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *); 111 112 int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *); 113 int get_acorn_filename(struct iso_directory_record *, char *, struct inode *); 114 115 extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *); 116 extern struct buffer_head *isofs_bread(struct inode *, sector_t); 117 extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long); 118 119 extern struct inode *isofs_iget(struct super_block *sb, 120 unsigned long block, 121 unsigned long offset); 122 123 /* Because the inode number is no longer relevant to finding the 124 * underlying meta-data for an inode, we are free to choose a more 125 * convenient 32-bit number as the inode number. The inode numbering 126 * scheme was recommended by Sergey Vlasov and Eric Lammerts. */ 127 static inline unsigned long isofs_get_ino(unsigned long block, 128 unsigned long offset, 129 unsigned long bufbits) 130 { 131 return (block << (bufbits - 5)) | (offset >> 5); 132 } 133 134 /* Every directory can have many redundant directory entries scattered 135 * throughout the directory tree. First there is the directory entry 136 * with the name of the directory stored in the parent directory. 137 * Then, there is the "." directory entry stored in the directory 138 * itself. Finally, there are possibly many ".." directory entries 139 * stored in all the subdirectories. 140 * 141 * In order for the NFS get_parent() method to work and for the 142 * general consistency of the dcache, we need to make sure the 143 * "i_iget5_block" and "i_iget5_offset" all point to exactly one of 144 * the many redundant entries for each directory. We normalize the 145 * block and offset by always making them point to the "." directory. 146 * 147 * Notice that we do not use the entry for the directory with the name 148 * that is located in the parent directory. Even though choosing this 149 * first directory is more natural, it is much easier to find the "." 150 * entry in the NFS get_parent() method because it is implicitly 151 * encoded in the "extent + ext_attr_length" fields of _all_ the 152 * redundant entries for the directory. Thus, it can always be 153 * reached regardless of which directory entry you have in hand. 154 * 155 * This works because the "." entry is simply the first directory 156 * record when you start reading the file that holds all the directory 157 * records, and this file starts at "extent + ext_attr_length" blocks. 158 * Because the "." entry is always the first entry listed in the 159 * directories file, the normalized "offset" value is always 0. 160 * 161 * You should pass the directory entry in "de". On return, "block" 162 * and "offset" will hold normalized values. Only directories are 163 * affected making it safe to call even for non-directory file 164 * types. */ 165 static inline void 166 isofs_normalize_block_and_offset(struct iso_directory_record* de, 167 unsigned long *block, 168 unsigned long *offset) 169 { 170 /* Only directories are normalized. */ 171 if (de->flags[0] & 2) { 172 *offset = 0; 173 *block = (unsigned long)isonum_733(de->extent) 174 + (unsigned long)isonum_711(de->ext_attr_length); 175 } 176 } 177 178 extern const struct inode_operations isofs_dir_inode_operations; 179 extern const struct file_operations isofs_dir_operations; 180 extern const struct address_space_operations isofs_symlink_aops; 181 extern struct export_operations isofs_export_ops; 182