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