LCOV - code coverage report
Current view: top level - lkbce/fs/isofs - isofs.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 19 19 100.0 %
Date: 2017-01-25 Functions: 7 7 100.0 %

          Line data    Source code
       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             : };
      59             : 
      60             : #define ISOFS_INVALID_MODE ((mode_t) -1)
      61             : 
      62             : static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
      63             : {
      64         412 :         return sb->s_fs_info;
      65             : }
      66             : 
      67             : static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
      68             : {
      69         222 :         return container_of(inode, struct iso_inode_info, vfs_inode);
      70             : }
      71             : 
      72             : static inline int isonum_711(char *p)
      73             : {
      74          24 :         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          26 :         /* Ignore bigendian datum due to broken mastering programs */
      91          78 :         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         260 :         /* Ignore bigendian datum due to broken mastering programs */
     104         780 :         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 *);
     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 *, struct nameidata *);
     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             : extern struct inode *isofs_iget(struct super_block *sb,
     122             :                                 unsigned long block,
     123             :                                 unsigned long offset);
     124             : 
     125             : /* Because the inode number is no longer relevant to finding the
     126             :  * underlying meta-data for an inode, we are free to choose a more
     127             :  * convenient 32-bit number as the inode number.  The inode numbering
     128             :  * scheme was recommended by Sergey Vlasov and Eric Lammerts. */
     129             : static inline unsigned long isofs_get_ino(unsigned long block,
     130             :                                           unsigned long offset,
     131             :                                           unsigned long bufbits)
     132             : {
     133          17 :         return (block << (bufbits - 5)) | (offset >> 5);
     134             : }
     135             : 
     136             : /* Every directory can have many redundant directory entries scattered
     137             :  * throughout the directory tree.  First there is the directory entry
     138             :  * with the name of the directory stored in the parent directory.
     139             :  * Then, there is the "." directory entry stored in the directory
     140             :  * itself.  Finally, there are possibly many ".." directory entries
     141             :  * stored in all the subdirectories.
     142             :  *
     143             :  * In order for the NFS get_parent() method to work and for the
     144             :  * general consistency of the dcache, we need to make sure the
     145             :  * "i_iget5_block" and "i_iget5_offset" all point to exactly one of
     146             :  * the many redundant entries for each directory.  We normalize the
     147             :  * block and offset by always making them point to the "."  directory.
     148             :  *
     149             :  * Notice that we do not use the entry for the directory with the name
     150             :  * that is located in the parent directory.  Even though choosing this
     151             :  * first directory is more natural, it is much easier to find the "."
     152             :  * entry in the NFS get_parent() method because it is implicitly
     153             :  * encoded in the "extent + ext_attr_length" fields of _all_ the
     154             :  * redundant entries for the directory.  Thus, it can always be
     155             :  * reached regardless of which directory entry you have in hand.
     156             :  *
     157             :  * This works because the "." entry is simply the first directory
     158             :  * record when you start reading the file that holds all the directory
     159             :  * records, and this file starts at "extent + ext_attr_length" blocks.
     160             :  * Because the "." entry is always the first entry listed in the
     161             :  * directories file, the normalized "offset" value is always 0.
     162             :  *
     163             :  * You should pass the directory entry in "de".  On return, "block"
     164             :  * and "offset" will hold normalized values.  Only directories are
     165             :  * affected making it safe to call even for non-directory file
     166             :  * types. */
     167             : static inline void
     168             : isofs_normalize_block_and_offset(struct iso_directory_record* de,
     169             :                                  unsigned long *block,
     170             :                                  unsigned long *offset)
     171          14 : {
     172          14 :         /* Only directories are normalized. */
     173          28 :         if (de->flags[0] & 2) {
     174          14 :                 *offset = 0;
     175          70 :                 *block = (unsigned long)isonum_733(de->extent)
     176             :                         + (unsigned long)isonum_711(de->ext_attr_length);
     177             :         }
     178          28 : }
     179             : 
     180           1 : extern const struct inode_operations isofs_dir_inode_operations;
     181           1 : extern const struct file_operations isofs_dir_operations;
     182           1 : extern const struct address_space_operations isofs_symlink_aops;
     183           1 : extern const struct export_operations isofs_export_ops;

Generated by: LCOV version 1.10