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