fs/isofs/isofs.h

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