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 struct mutex s_mutex; /* replaces BKL, please remove if possible */ 59 }; 60 61 #define ISOFS_INVALID_MODE ((mode_t) -1) 62 63 static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb) 64 { 65 return sb->s_fs_info; 66 } 67 68 static inline struct iso_inode_info *ISOFS_I(struct inode *inode) 69 { 70 return container_of(inode, struct iso_inode_info, vfs_inode); 71 } 72 73 static inline int isonum_711(char *p) 74 { 75 return *(u8 *)p; 76 } 77 static inline int isonum_712(char *p) 78 { 79 return *(s8 *)p; 80 } 81 static inline unsigned int isonum_721(char *p) 82 { 83 return get_unaligned_le16(p); 84 } 85 static inline unsigned int isonum_722(char *p) 86 { 87 return get_unaligned_be16(p); 88 } 89 static inline unsigned int isonum_723(char *p) 90 { 91 /* Ignore bigendian datum due to broken mastering programs */ 92 return get_unaligned_le16(p); 93 } 94 static inline unsigned int isonum_731(char *p) 95 { 96 return get_unaligned_le32(p); 97 } 98 static inline unsigned int isonum_732(char *p) 99 { 100 return get_unaligned_be32(p); 101 } 102 static inline unsigned int isonum_733(char *p) 103 { 104 /* Ignore bigendian datum due to broken mastering programs */ 105 return get_unaligned_le32(p); 106 } 107 extern int iso_date(char *, int); 108 109 struct inode; /* To make gcc happy */ 110 111 extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *); 112 extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *); 113 extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *); 114 115 int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *); 116 int get_acorn_filename(struct iso_directory_record *, char *, struct inode *); 117 118 extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *); 119 extern struct buffer_head *isofs_bread(struct inode *, sector_t); 120 extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long); 121 122 extern struct inode *isofs_iget(struct super_block *sb, 123 unsigned long block, 124 unsigned long offset); 125 126 /* Because the inode number is no longer relevant to finding the 127 * underlying meta-data for an inode, we are free to choose a more 128 * convenient 32-bit number as the inode number. The inode numbering 129 * scheme was recommended by Sergey Vlasov and Eric Lammerts. */ 130 static inline unsigned long isofs_get_ino(unsigned long block, 131 unsigned long offset, 132 unsigned long bufbits) 133 { 134 return (block << (bufbits - 5)) | (offset >> 5); 135 } 136 137 /* Every directory can have many redundant directory entries scattered 138 * throughout the directory tree. First there is the directory entry 139 * with the name of the directory stored in the parent directory. 140 * Then, there is the "." directory entry stored in the directory 141 * itself. Finally, there are possibly many ".." directory entries 142 * stored in all the subdirectories. 143 * 144 * In order for the NFS get_parent() method to work and for the 145 * general consistency of the dcache, we need to make sure the 146 * "i_iget5_block" and "i_iget5_offset" all point to exactly one of 147 * the many redundant entries for each directory. We normalize the 148 * block and offset by always making them point to the "." directory. 149 * 150 * Notice that we do not use the entry for the directory with the name 151 * that is located in the parent directory. Even though choosing this 152 * first directory is more natural, it is much easier to find the "." 153 * entry in the NFS get_parent() method because it is implicitly 154 * encoded in the "extent + ext_attr_length" fields of _all_ the 155 * redundant entries for the directory. Thus, it can always be 156 * reached regardless of which directory entry you have in hand. 157 * 158 * This works because the "." entry is simply the first directory 159 * record when you start reading the file that holds all the directory 160 * records, and this file starts at "extent + ext_attr_length" blocks. 161 * Because the "." entry is always the first entry listed in the 162 * directories file, the normalized "offset" value is always 0. 163 * 164 * You should pass the directory entry in "de". On return, "block" 165 * and "offset" will hold normalized values. Only directories are 166 * affected making it safe to call even for non-directory file 167 * types. */ 168 static inline void 169 isofs_normalize_block_and_offset(struct iso_directory_record* de, 170 unsigned long *block, 171 unsigned long *offset) 172 { 173 /* Only directories are normalized. */ 174 if (de->flags[0] & 2) { 175 *offset = 0; 176 *block = (unsigned long)isonum_733(de->extent) 177 + (unsigned long)isonum_711(de->ext_attr_length); 178 } 179 } 180 181 extern const struct inode_operations isofs_dir_inode_operations; 182 extern const struct file_operations isofs_dir_operations; 183 extern const struct address_space_operations isofs_symlink_aops; 184 extern const struct export_operations isofs_export_ops; 185