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
7enum 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 */
16struct 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 */
31struct 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
62static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
63{
64	return sb->s_fs_info;
65}
66
67static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
68{
69	return container_of(inode, struct iso_inode_info, vfs_inode);
70}
71
72static inline int isonum_711(char *p)
73{
74	return *(u8 *)p;
75}
76static inline int isonum_712(char *p)
77{
78	return *(s8 *)p;
79}
80static inline unsigned int isonum_721(char *p)
81{
82	return get_unaligned_le16(p);
83}
84static inline unsigned int isonum_722(char *p)
85{
86	return get_unaligned_be16(p);
87}
88static inline unsigned int isonum_723(char *p)
89{
90	/* Ignore bigendian datum due to broken mastering programs */
91	return get_unaligned_le16(p);
92}
93static inline unsigned int isonum_731(char *p)
94{
95	return get_unaligned_le32(p);
96}
97static inline unsigned int isonum_732(char *p)
98{
99	return get_unaligned_be32(p);
100}
101static inline unsigned int isonum_733(char *p)
102{
103	/* Ignore bigendian datum due to broken mastering programs */
104	return get_unaligned_le32(p);
105}
106extern int iso_date(char *, int);
107
108struct inode;		/* To make gcc happy */
109
110extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *);
111extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
112extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);
113
114int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
115int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);
116
117extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *);
118extern struct buffer_head *isofs_bread(struct inode *, sector_t);
119extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);
120
121extern 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. */
129static inline unsigned long isofs_get_ino(unsigned long block,
130					  unsigned long offset,
131					  unsigned long bufbits)
132{
133	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. */
167static inline void
168isofs_normalize_block_and_offset(struct iso_directory_record* de,
169				 unsigned long *block,
170				 unsigned long *offset)
171{
172	/* Only directories are normalized. */
173	if (de->flags[0] & 2) {
174		*offset = 0;
175		*block = (unsigned long)isonum_733(de->extent)
176			+ (unsigned long)isonum_711(de->ext_attr_length);
177	}
178}
179
180extern const struct inode_operations isofs_dir_inode_operations;
181extern const struct file_operations isofs_dir_operations;
182extern const struct address_space_operations isofs_symlink_aops;
183extern const struct export_operations isofs_export_ops;
184