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Linux/fs/isofs/isofs.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #include <linux/fs.h>
  3 #include <linux/buffer_head.h>
  4 #include <linux/exportfs.h>
  5 #include <linux/iso_fs.h>
  6 #include <asm/unaligned.h>
  7 
  8 enum isofs_file_format {
  9         isofs_file_normal = 0,
 10         isofs_file_sparse = 1,
 11         isofs_file_compressed = 2,
 12 };
 13         
 14 /*
 15  * iso fs inode data in memory
 16  */
 17 struct iso_inode_info {
 18         unsigned long i_iget5_block;
 19         unsigned long i_iget5_offset;
 20         unsigned int i_first_extent;
 21         unsigned char i_file_format;
 22         unsigned char i_format_parm[3];
 23         unsigned long i_next_section_block;
 24         unsigned long i_next_section_offset;
 25         off_t i_section_size;
 26         struct inode vfs_inode;
 27 };
 28 
 29 /*
 30  * iso9660 super-block data in memory
 31  */
 32 struct isofs_sb_info {
 33         unsigned long s_ninodes;
 34         unsigned long s_nzones;
 35         unsigned long s_firstdatazone;
 36         unsigned long s_log_zone_size;
 37         unsigned long s_max_size;
 38         
 39         int           s_rock_offset; /* offset of SUSP fields within SU area */
 40         s32           s_sbsector;
 41         unsigned char s_joliet_level;
 42         unsigned char s_mapping;
 43         unsigned char s_check;
 44         unsigned char s_session;
 45         unsigned int  s_high_sierra:1;
 46         unsigned int  s_rock:2;
 47         unsigned int  s_utf8:1;
 48         unsigned int  s_cruft:1; /* Broken disks with high byte of length
 49                                   * containing junk */
 50         unsigned int  s_nocompress:1;
 51         unsigned int  s_hide:1;
 52         unsigned int  s_showassoc:1;
 53         unsigned int  s_overriderockperm:1;
 54         unsigned int  s_uid_set:1;
 55         unsigned int  s_gid_set:1;
 56 
 57         umode_t s_fmode;
 58         umode_t s_dmode;
 59         kgid_t s_gid;
 60         kuid_t s_uid;
 61         struct nls_table *s_nls_iocharset; /* Native language support table */
 62 };
 63 
 64 #define ISOFS_INVALID_MODE ((umode_t) -1)
 65 
 66 static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
 67 {
 68         return sb->s_fs_info;
 69 }
 70 
 71 static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
 72 {
 73         return container_of(inode, struct iso_inode_info, vfs_inode);
 74 }
 75 
 76 static inline int isonum_711(u8 *p)
 77 {
 78         return *p;
 79 }
 80 static inline int isonum_712(s8 *p)
 81 {
 82         return *p;
 83 }
 84 static inline unsigned int isonum_721(u8 *p)
 85 {
 86         return get_unaligned_le16(p);
 87 }
 88 static inline unsigned int isonum_722(u8 *p)
 89 {
 90         return get_unaligned_be16(p);
 91 }
 92 static inline unsigned int isonum_723(u8 *p)
 93 {
 94         /* Ignore bigendian datum due to broken mastering programs */
 95         return get_unaligned_le16(p);
 96 }
 97 static inline unsigned int isonum_731(u8 *p)
 98 {
 99         return get_unaligned_le32(p);
100 }
101 static inline unsigned int isonum_732(u8 *p)
102 {
103         return get_unaligned_be32(p);
104 }
105 static inline unsigned int isonum_733(u8 *p)
106 {
107         /* Ignore bigendian datum due to broken mastering programs */
108         return get_unaligned_le32(p);
109 }
110 extern int iso_date(u8 *, int);
111 
112 struct inode;           /* To make gcc happy */
113 
114 extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *, int relocated);
115 extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
116 extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);
117 
118 int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
119 int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);
120 
121 extern struct dentry *isofs_lookup(struct inode *, struct dentry *, unsigned int flags);
122 extern struct buffer_head *isofs_bread(struct inode *, sector_t);
123 extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);
124 
125 struct inode *__isofs_iget(struct super_block *sb,
126                            unsigned long block,
127                            unsigned long offset,
128                            int relocated);
129 
130 static inline struct inode *isofs_iget(struct super_block *sb,
131                                        unsigned long block,
132                                        unsigned long offset)
133 {
134         return __isofs_iget(sb, block, offset, 0);
135 }
136 
137 static inline struct inode *isofs_iget_reloc(struct super_block *sb,
138                                              unsigned long block,
139                                              unsigned long offset)
140 {
141         return __isofs_iget(sb, block, offset, 1);
142 }
143 
144 /* Because the inode number is no longer relevant to finding the
145  * underlying meta-data for an inode, we are free to choose a more
146  * convenient 32-bit number as the inode number.  The inode numbering
147  * scheme was recommended by Sergey Vlasov and Eric Lammerts. */
148 static inline unsigned long isofs_get_ino(unsigned long block,
149                                           unsigned long offset,
150                                           unsigned long bufbits)
151 {
152         return (block << (bufbits - 5)) | (offset >> 5);
153 }
154 
155 /* Every directory can have many redundant directory entries scattered
156  * throughout the directory tree.  First there is the directory entry
157  * with the name of the directory stored in the parent directory.
158  * Then, there is the "." directory entry stored in the directory
159  * itself.  Finally, there are possibly many ".." directory entries
160  * stored in all the subdirectories.
161  *
162  * In order for the NFS get_parent() method to work and for the
163  * general consistency of the dcache, we need to make sure the
164  * "i_iget5_block" and "i_iget5_offset" all point to exactly one of
165  * the many redundant entries for each directory.  We normalize the
166  * block and offset by always making them point to the "."  directory.
167  *
168  * Notice that we do not use the entry for the directory with the name
169  * that is located in the parent directory.  Even though choosing this
170  * first directory is more natural, it is much easier to find the "."
171  * entry in the NFS get_parent() method because it is implicitly
172  * encoded in the "extent + ext_attr_length" fields of _all_ the
173  * redundant entries for the directory.  Thus, it can always be
174  * reached regardless of which directory entry you have in hand.
175  *
176  * This works because the "." entry is simply the first directory
177  * record when you start reading the file that holds all the directory
178  * records, and this file starts at "extent + ext_attr_length" blocks.
179  * Because the "." entry is always the first entry listed in the
180  * directories file, the normalized "offset" value is always 0.
181  *
182  * You should pass the directory entry in "de".  On return, "block"
183  * and "offset" will hold normalized values.  Only directories are
184  * affected making it safe to call even for non-directory file
185  * types. */
186 static inline void
187 isofs_normalize_block_and_offset(struct iso_directory_record* de,
188                                  unsigned long *block,
189                                  unsigned long *offset)
190 {
191         /* Only directories are normalized. */
192         if (de->flags[0] & 2) {
193                 *offset = 0;
194                 *block = (unsigned long)isonum_733(de->extent)
195                         + (unsigned long)isonum_711(de->ext_attr_length);
196         }
197 }
198 
199 extern const struct inode_operations isofs_dir_inode_operations;
200 extern const struct file_operations isofs_dir_operations;
201 extern const struct address_space_operations isofs_symlink_aops;
202 extern const struct export_operations isofs_export_ops;
203 

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