include/linux/iso_fs.h

   1
   2 #ifndef _ISOFS_FS_H
   3 #define _ISOFS_FS_H
   4
   5 #include <linux/types.h>
   6 /*
   7  * The isofs filesystem constants/structures
   8  */
   9
  10 /* This part borrowed from the bsd386 isofs */
  11 #define ISODCL(from, to) (to - from + 1)
  12
  13 struct iso_volume_descriptor {
  14         char type[ISODCL(1,1)]; /* 711 */
  15         char id[ISODCL(2,6)];
  16         char version[ISODCL(7,7)];
  17         char data[ISODCL(8,2048)];
  18 };
  19
  20 /* volume descriptor types */
  21 #define ISO_VD_PRIMARY 1
  22 #define ISO_VD_SUPPLEMENTARY 2
  23 #define ISO_VD_END 255
  24
  25 #define ISO_STANDARD_ID "CD001"
  26
  27 struct iso_primary_descriptor {
  28         char type                       [ISODCL (  1,   1)]; /* 711 */
  29         char id                         [ISODCL (  2,   6)];
  30         char version                    [ISODCL (  7,   7)]; /* 711 */
  31         char unused1                    [ISODCL (  8,   8)];
  32         char system_id                  [ISODCL (  9,  40)]; /* achars */
  33         char volume_id                  [ISODCL ( 41,  72)]; /* dchars */
  34         char unused2                    [ISODCL ( 73,  80)];
  35         char volume_space_size          [ISODCL ( 81,  88)]; /* 733 */
  36         char unused3                    [ISODCL ( 89, 120)];
  37         char volume_set_size            [ISODCL (121, 124)]; /* 723 */
  38         char volume_sequence_number     [ISODCL (125, 128)]; /* 723 */
  39         char logical_block_size         [ISODCL (129, 132)]; /* 723 */
  40         char path_table_size            [ISODCL (133, 140)]; /* 733 */
  41         char type_l_path_table          [ISODCL (141, 144)]; /* 731 */
  42         char opt_type_l_path_table      [ISODCL (145, 148)]; /* 731 */
  43         char type_m_path_table          [ISODCL (149, 152)]; /* 732 */
  44         char opt_type_m_path_table      [ISODCL (153, 156)]; /* 732 */
  45         char root_directory_record      [ISODCL (157, 190)]; /* 9.1 */
  46         char volume_set_id              [ISODCL (191, 318)]; /* dchars */
  47         char publisher_id               [ISODCL (319, 446)]; /* achars */
  48         char preparer_id                [ISODCL (447, 574)]; /* achars */
  49         char application_id             [ISODCL (575, 702)]; /* achars */
  50         char copyright_file_id          [ISODCL (703, 739)]; /* 7.5 dchars */
  51         char abstract_file_id           [ISODCL (740, 776)]; /* 7.5 dchars */
  52         char bibliographic_file_id      [ISODCL (777, 813)]; /* 7.5 dchars */
  53         char creation_date              [ISODCL (814, 830)]; /* 8.4.26.1 */
  54         char modification_date          [ISODCL (831, 847)]; /* 8.4.26.1 */
  55         char expiration_date            [ISODCL (848, 864)]; /* 8.4.26.1 */
  56         char effective_date             [ISODCL (865, 881)]; /* 8.4.26.1 */
  57         char file_structure_version     [ISODCL (882, 882)]; /* 711 */
  58         char unused4                    [ISODCL (883, 883)];
  59         char application_data           [ISODCL (884, 1395)];
  60         char unused5                    [ISODCL (1396, 2048)];
  61 };
  62
  63 /* Almost the same as the primary descriptor but two fields are specified */
  64 struct iso_supplementary_descriptor {
  65         char type                       [ISODCL (  1,   1)]; /* 711 */
  66         char id                         [ISODCL (  2,   6)];
  67         char version                    [ISODCL (  7,   7)]; /* 711 */
  68         char flags                      [ISODCL (  8,   8)]; /* 853 */
  69         char system_id                  [ISODCL (  9,  40)]; /* achars */
  70         char volume_id                  [ISODCL ( 41,  72)]; /* dchars */
  71         char unused2                    [ISODCL ( 73,  80)];
  72         char volume_space_size          [ISODCL ( 81,  88)]; /* 733 */
  73         char escape                     [ISODCL ( 89, 120)]; /* 856 */
  74         char volume_set_size            [ISODCL (121, 124)]; /* 723 */
  75         char volume_sequence_number     [ISODCL (125, 128)]; /* 723 */
  76         char logical_block_size         [ISODCL (129, 132)]; /* 723 */
  77         char path_table_size            [ISODCL (133, 140)]; /* 733 */
  78         char type_l_path_table          [ISODCL (141, 144)]; /* 731 */
  79         char opt_type_l_path_table      [ISODCL (145, 148)]; /* 731 */
  80         char type_m_path_table          [ISODCL (149, 152)]; /* 732 */
  81         char opt_type_m_path_table      [ISODCL (153, 156)]; /* 732 */
  82         char root_directory_record      [ISODCL (157, 190)]; /* 9.1 */
  83         char volume_set_id              [ISODCL (191, 318)]; /* dchars */
  84         char publisher_id               [ISODCL (319, 446)]; /* achars */
  85         char preparer_id                [ISODCL (447, 574)]; /* achars */
  86         char application_id             [ISODCL (575, 702)]; /* achars */
  87         char copyright_file_id          [ISODCL (703, 739)]; /* 7.5 dchars */
  88         char abstract_file_id           [ISODCL (740, 776)]; /* 7.5 dchars */
  89         char bibliographic_file_id      [ISODCL (777, 813)]; /* 7.5 dchars */
  90         char creation_date              [ISODCL (814, 830)]; /* 8.4.26.1 */
  91         char modification_date          [ISODCL (831, 847)]; /* 8.4.26.1 */
  92         char expiration_date            [ISODCL (848, 864)]; /* 8.4.26.1 */
  93         char effective_date             [ISODCL (865, 881)]; /* 8.4.26.1 */
  94         char file_structure_version     [ISODCL (882, 882)]; /* 711 */
  95         char unused4                    [ISODCL (883, 883)];
  96         char application_data           [ISODCL (884, 1395)];
  97         char unused5                    [ISODCL (1396, 2048)];
  98 };
  99
 100
 101 #define HS_STANDARD_ID "CDROM"
 102
 103 struct  hs_volume_descriptor {
 104         char foo                        [ISODCL (  1,   8)]; /* 733 */
 105         char type                       [ISODCL (  9,   9)]; /* 711 */
 106         char id                         [ISODCL ( 10,  14)];
 107         char version                    [ISODCL ( 15,  15)]; /* 711 */
 108         char data[ISODCL(16,2048)];
 109 };
 110
 111
 112 struct hs_primary_descriptor {
 113         char foo                        [ISODCL (  1,   8)]; /* 733 */
 114         char type                       [ISODCL (  9,   9)]; /* 711 */
 115         char id                         [ISODCL ( 10,  14)];
 116         char version                    [ISODCL ( 15,  15)]; /* 711 */
 117         char unused1                    [ISODCL ( 16,  16)]; /* 711 */
 118         char system_id                  [ISODCL ( 17,  48)]; /* achars */
 119         char volume_id                  [ISODCL ( 49,  80)]; /* dchars */
 120         char unused2                    [ISODCL ( 81,  88)]; /* 733 */
 121         char volume_space_size          [ISODCL ( 89,  96)]; /* 733 */
 122         char unused3                    [ISODCL ( 97, 128)]; /* 733 */
 123         char volume_set_size            [ISODCL (129, 132)]; /* 723 */
 124         char volume_sequence_number     [ISODCL (133, 136)]; /* 723 */
 125         char logical_block_size         [ISODCL (137, 140)]; /* 723 */
 126         char path_table_size            [ISODCL (141, 148)]; /* 733 */
 127         char type_l_path_table          [ISODCL (149, 152)]; /* 731 */
 128         char unused4                    [ISODCL (153, 180)]; /* 733 */
 129         char root_directory_record      [ISODCL (181, 214)]; /* 9.1 */
 130 };
 131
 132 /* We use this to help us look up the parent inode numbers. */
 133
 134 struct iso_path_table{
 135         unsigned char  name_len[2];     /* 721 */
 136         char extent[4];         /* 731 */
 137         char  parent[2];        /* 721 */
 138         char name[0];
 139 } __attribute__((packed));
 140
 141 /* high sierra is identical to iso, except that the date is only 6 bytes, and
 142    there is an extra reserved byte after the flags */
 143
 144 struct iso_directory_record {
 145         char length                     [ISODCL (1, 1)]; /* 711 */
 146         char ext_attr_length            [ISODCL (2, 2)]; /* 711 */
 147         char extent                     [ISODCL (3, 10)]; /* 733 */
 148         char size                       [ISODCL (11, 18)]; /* 733 */
 149         char date                       [ISODCL (19, 25)]; /* 7 by 711 */
 150         char flags                      [ISODCL (26, 26)];
 151         char file_unit_size             [ISODCL (27, 27)]; /* 711 */
 152         char interleave                 [ISODCL (28, 28)]; /* 711 */
 153         char volume_sequence_number     [ISODCL (29, 32)]; /* 723 */
 154         unsigned char name_len          [ISODCL (33, 33)]; /* 711 */
 155         char name                       [0];
 156 } __attribute__((packed));
 157
 158 #define ISOFS_BLOCK_BITS 11
 159 #define ISOFS_BLOCK_SIZE 2048
 160
 161 #define ISOFS_BUFFER_SIZE(INODE) ((INODE)->i_sb->s_blocksize)
 162 #define ISOFS_BUFFER_BITS(INODE) ((INODE)->i_sb->s_blocksize_bits)
 163
 164 #define ISOFS_SUPER_MAGIC 0x9660
 165
 166 #ifdef __KERNEL__
 167 /* Number conversion inlines, named after the section in ISO 9660
 168    they correspond to. */
 169
 170 #include <asm/byteorder.h>
 171 #include <asm/unaligned.h>
 172 #include <linux/iso_fs_i.h>
 173 #include <linux/iso_fs_sb.h>
 174
 175 static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
 176 {
 177         return sb->s_fs_info;
 178 }
 179
 180 static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
 181 {
 182         return container_of(inode, struct iso_inode_info, vfs_inode);
 183 }
 184
 185 static inline int isonum_711(char *p)
 186 {
 187         return *(u8 *)p;
 188 }
 189 static inline int isonum_712(char *p)
 190 {
 191         return *(s8 *)p;
 192 }
 193 static inline unsigned int isonum_721(char *p)
 194 {
 195         return le16_to_cpu(get_unaligned((__le16 *)p));
 196 }
 197 static inline unsigned int isonum_722(char *p)
 198 {
 199         return be16_to_cpu(get_unaligned((__le16 *)p));
 200 }
 201 static inline unsigned int isonum_723(char *p)
 202 {
 203         /* Ignore bigendian datum due to broken mastering programs */
 204         return le16_to_cpu(get_unaligned((__le16 *)p));
 205 }
 206 static inline unsigned int isonum_731(char *p)
 207 {
 208         return le32_to_cpu(get_unaligned((__le32 *)p));
 209 }
 210 static inline unsigned int isonum_732(char *p)
 211 {
 212         return be32_to_cpu(get_unaligned((__le32 *)p));
 213 }
 214 static inline unsigned int isonum_733(char *p)
 215 {
 216         /* Ignore bigendian datum due to broken mastering programs */
 217         return le32_to_cpu(get_unaligned((__le32 *)p));
 218 }
 219 extern int iso_date(char *, int);
 220
 221 struct inode;           /* To make gcc happy */
 222
 223 extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *);
 224 extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
 225 extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);
 226
 227 int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
 228 int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);
 229
 230 extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *);
 231 extern struct buffer_head *isofs_bread(struct inode *, sector_t);
 232 extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);
 233
 234 extern struct inode *isofs_iget(struct super_block *sb,
 235                                 unsigned long block,
 236                                 unsigned long offset);
 237
 238 /* Because the inode number is no longer relevant to finding the
 239  * underlying meta-data for an inode, we are free to choose a more
 240  * convenient 32-bit number as the inode number.  The inode numbering
 241  * scheme was recommended by Sergey Vlasov and Eric Lammerts. */
 242 static inline unsigned long isofs_get_ino(unsigned long block,
 243                                           unsigned long offset,
 244                                           unsigned long bufbits)
 245 {
 246         return (block << (bufbits - 5)) | (offset >> 5);
 247 }
 248
 249 /* Every directory can have many redundant directory entries scattered
 250  * throughout the directory tree.  First there is the directory entry
 251  * with the name of the directory stored in the parent directory.
 252  * Then, there is the "." directory entry stored in the directory
 253  * itself.  Finally, there are possibly many ".." directory entries
 254  * stored in all the subdirectories.
 255  *
 256  * In order for the NFS get_parent() method to work and for the
 257  * general consistency of the dcache, we need to make sure the
 258  * "i_iget5_block" and "i_iget5_offset" all point to exactly one of
 259  * the many redundant entries for each directory.  We normalize the
 260  * block and offset by always making them point to the "."  directory.
 261  *
 262  * Notice that we do not use the entry for the directory with the name
 263  * that is located in the parent directory.  Even though choosing this
 264  * first directory is more natural, it is much easier to find the "."
 265  * entry in the NFS get_parent() method because it is implicitly
 266  * encoded in the "extent + ext_attr_length" fields of _all_ the
 267  * redundant entries for the directory.  Thus, it can always be
 268  * reached regardless of which directory entry you have in hand.
 269  *
 270  * This works because the "." entry is simply the first directory
 271  * record when you start reading the file that holds all the directory
 272  * records, and this file starts at "extent + ext_attr_length" blocks.
 273  * Because the "." entry is always the first entry listed in the
 274  * directories file, the normalized "offset" value is always 0.
 275  *
 276  * You should pass the directory entry in "de".  On return, "block"
 277  * and "offset" will hold normalized values.  Only directories are
 278  * affected making it safe to call even for non-directory file
 279  * types. */
 280 static inline void
 281 isofs_normalize_block_and_offset(struct iso_directory_record* de,
 282                                  unsigned long *block,
 283                                  unsigned long *offset)
 284 {
 285         /* Only directories are normalized. */
 286         if (de->flags[0] & 2) {
 287                 *offset = 0;
 288                 *block = (unsigned long)isonum_733(de->extent)
 289                         + (unsigned long)isonum_711(de->ext_attr_length);
 290         }
 291 }
 292
 293 extern struct inode_operations isofs_dir_inode_operations;
 294 extern struct file_operations isofs_dir_operations;
 295 extern struct address_space_operations isofs_symlink_aops;
 296 extern struct export_operations isofs_export_ops;
 297
 298 /* The following macros are used to check for memory leaks. */
 299 #ifdef LEAK_CHECK
 300 #define free_s leak_check_free_s
 301 #define malloc leak_check_malloc
 302 #define sb_bread leak_check_bread
 303 #define brelse leak_check_brelse
 304 extern void * leak_check_malloc(unsigned int size);
 305 extern void leak_check_free_s(void * obj, int size);
 306 extern struct buffer_head * leak_check_bread(struct super_block *sb, int block);
 307 extern void leak_check_brelse(struct buffer_head * bh);
 308 #endif /* LEAK_CHECK */
 309
 310 #endif /* __KERNEL__ */
 311
 312 #endif