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-rw-r--r--fs/isofs/isofs.h190
1 files changed, 190 insertions, 0 deletions
diff --git a/fs/isofs/isofs.h b/fs/isofs/isofs.h
new file mode 100644
index 000000000000..9ce7b51fb614
--- /dev/null
+++ b/fs/isofs/isofs.h
@@ -0,0 +1,190 @@
1#include <linux/fs.h>
2#include <linux/buffer_head.h>
3#include <linux/iso_fs.h>
4#include <asm/unaligned.h>
5
6enum 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 */
15struct 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 */
30struct 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
57static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
58{
59 return sb->s_fs_info;
60}
61
62static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
63{
64 return container_of(inode, struct iso_inode_info, vfs_inode);
65}
66
67static inline int isonum_711(char *p)
68{
69 return *(u8 *)p;
70}
71static inline int isonum_712(char *p)
72{
73 return *(s8 *)p;
74}
75static inline unsigned int isonum_721(char *p)
76{
77 return le16_to_cpu(get_unaligned((__le16 *)p));
78}
79static inline unsigned int isonum_722(char *p)
80{
81 return be16_to_cpu(get_unaligned((__le16 *)p));
82}
83static 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}
88static inline unsigned int isonum_731(char *p)
89{
90 return le32_to_cpu(get_unaligned((__le32 *)p));
91}
92static inline unsigned int isonum_732(char *p)
93{
94 return be32_to_cpu(get_unaligned((__le32 *)p));
95}
96static 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}
101extern int iso_date(char *, int);
102
103struct inode; /* To make gcc happy */
104
105extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *);
106extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
107extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);
108
109int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
110int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);
111
112extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *);
113extern struct buffer_head *isofs_bread(struct inode *, sector_t);
114extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);
115
116extern 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. */
124static 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. */
162static inline void
163isofs_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
175extern struct inode_operations isofs_dir_inode_operations;
176extern struct file_operations isofs_dir_operations;
177extern struct address_space_operations isofs_symlink_aops;
178extern 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
186extern void * leak_check_malloc(unsigned int size);
187extern void leak_check_free_s(void * obj, int size);
188extern struct buffer_head * leak_check_bread(struct super_block *sb, int block);
189extern void leak_check_brelse(struct buffer_head * bh);
190#endif /* LEAK_CHECK */
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