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Linux/fs/isofs/isofs.h

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  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         umode_t s_fmode;
 54         umode_t s_dmode;
 55         kgid_t s_gid;
 56         kuid_t s_uid;
 57         struct nls_table *s_nls_iocharset; /* Native language support table */
 58 };
 59 
 60 #define ISOFS_INVALID_MODE ((umode_t) -1)
 61 
 62 static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
 63 {
 64         return sb->s_fs_info;
 65 }
 66 
 67 static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
 68 {
 69         return container_of(inode, struct iso_inode_info, vfs_inode);
 70 }
 71 
 72 static inline int isonum_711(char *p)
 73 {
 74         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         /* Ignore bigendian datum due to broken mastering programs */
 91         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         /* Ignore bigendian datum due to broken mastering programs */
104         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 *, int relocated);
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 *, unsigned int flags);
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 struct inode *__isofs_iget(struct super_block *sb,
122                            unsigned long block,
123                            unsigned long offset,
124                            int relocated);
125 
126 static inline struct inode *isofs_iget(struct super_block *sb,
127                                        unsigned long block,
128                                        unsigned long offset)
129 {
130         return __isofs_iget(sb, block, offset, 0);
131 }
132 
133 static inline struct inode *isofs_iget_reloc(struct super_block *sb,
134                                              unsigned long block,
135                                              unsigned long offset)
136 {
137         return __isofs_iget(sb, block, offset, 1);
138 }
139 
140 /* Because the inode number is no longer relevant to finding the
141  * underlying meta-data for an inode, we are free to choose a more
142  * convenient 32-bit number as the inode number.  The inode numbering
143  * scheme was recommended by Sergey Vlasov and Eric Lammerts. */
144 static inline unsigned long isofs_get_ino(unsigned long block,
145                                           unsigned long offset,
146                                           unsigned long bufbits)
147 {
148         return (block << (bufbits - 5)) | (offset >> 5);
149 }
150 
151 /* Every directory can have many redundant directory entries scattered
152  * throughout the directory tree.  First there is the directory entry
153  * with the name of the directory stored in the parent directory.
154  * Then, there is the "." directory entry stored in the directory
155  * itself.  Finally, there are possibly many ".." directory entries
156  * stored in all the subdirectories.
157  *
158  * In order for the NFS get_parent() method to work and for the
159  * general consistency of the dcache, we need to make sure the
160  * "i_iget5_block" and "i_iget5_offset" all point to exactly one of
161  * the many redundant entries for each directory.  We normalize the
162  * block and offset by always making them point to the "."  directory.
163  *
164  * Notice that we do not use the entry for the directory with the name
165  * that is located in the parent directory.  Even though choosing this
166  * first directory is more natural, it is much easier to find the "."
167  * entry in the NFS get_parent() method because it is implicitly
168  * encoded in the "extent + ext_attr_length" fields of _all_ the
169  * redundant entries for the directory.  Thus, it can always be
170  * reached regardless of which directory entry you have in hand.
171  *
172  * This works because the "." entry is simply the first directory
173  * record when you start reading the file that holds all the directory
174  * records, and this file starts at "extent + ext_attr_length" blocks.
175  * Because the "." entry is always the first entry listed in the
176  * directories file, the normalized "offset" value is always 0.
177  *
178  * You should pass the directory entry in "de".  On return, "block"
179  * and "offset" will hold normalized values.  Only directories are
180  * affected making it safe to call even for non-directory file
181  * types. */
182 static inline void
183 isofs_normalize_block_and_offset(struct iso_directory_record* de,
184                                  unsigned long *block,
185                                  unsigned long *offset)
186 {
187         /* Only directories are normalized. */
188         if (de->flags[0] & 2) {
189                 *offset = 0;
190                 *block = (unsigned long)isonum_733(de->extent)
191                         + (unsigned long)isonum_711(de->ext_attr_length);
192         }
193 }
194 
195 extern const struct inode_operations isofs_dir_inode_operations;
196 extern const struct file_operations isofs_dir_operations;
197 extern const struct address_space_operations isofs_symlink_aops;
198 extern const struct export_operations isofs_export_ops;
199 

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