ia64/linux-2.6.18-xen.hg

view fs/isofs/isofs.h @ 524:7f8b544237bf

netfront: Allow netfront in domain 0.

This is useful if your physical network device is in a utility domain.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Tue Apr 15 15:18:58 2008 +0100 (2008-04-15)
parents 831230e53067
children
line source
1 #include <linux/fs.h>
2 #include <linux/buffer_head.h>
3 #include <linux/iso_fs.h>
4 #include <asm/unaligned.h>
6 enum isofs_file_format {
7 isofs_file_normal = 0,
8 isofs_file_sparse = 1,
9 isofs_file_compressed = 2,
10 };
12 /*
13 * iso fs inode data in memory
14 */
15 struct 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 };
27 /*
28 * iso9660 super-block data in memory
29 */
30 struct 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;
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;
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 };
59 static inline struct isofs_sb_info *ISOFS_SB(struct super_block *sb)
60 {
61 return sb->s_fs_info;
62 }
64 static inline struct iso_inode_info *ISOFS_I(struct inode *inode)
65 {
66 return container_of(inode, struct iso_inode_info, vfs_inode);
67 }
69 static inline int isonum_711(char *p)
70 {
71 return *(u8 *)p;
72 }
73 static inline int isonum_712(char *p)
74 {
75 return *(s8 *)p;
76 }
77 static inline unsigned int isonum_721(char *p)
78 {
79 return le16_to_cpu(get_unaligned((__le16 *)p));
80 }
81 static inline unsigned int isonum_722(char *p)
82 {
83 return be16_to_cpu(get_unaligned((__le16 *)p));
84 }
85 static 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 }
90 static inline unsigned int isonum_731(char *p)
91 {
92 return le32_to_cpu(get_unaligned((__le32 *)p));
93 }
94 static inline unsigned int isonum_732(char *p)
95 {
96 return be32_to_cpu(get_unaligned((__le32 *)p));
97 }
98 static 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 }
103 extern int iso_date(char *, int);
105 struct inode; /* To make gcc happy */
107 extern int parse_rock_ridge_inode(struct iso_directory_record *, struct inode *);
108 extern int get_rock_ridge_filename(struct iso_directory_record *, char *, struct inode *);
109 extern int isofs_name_translate(struct iso_directory_record *, char *, struct inode *);
111 int get_joliet_filename(struct iso_directory_record *, unsigned char *, struct inode *);
112 int get_acorn_filename(struct iso_directory_record *, char *, struct inode *);
114 extern struct dentry *isofs_lookup(struct inode *, struct dentry *, struct nameidata *);
115 extern struct buffer_head *isofs_bread(struct inode *, sector_t);
116 extern int isofs_get_blocks(struct inode *, sector_t, struct buffer_head **, unsigned long);
118 extern struct inode *isofs_iget(struct super_block *sb,
119 unsigned long block,
120 unsigned long offset);
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. */
126 static 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 }
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. */
164 static inline void
165 isofs_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 }
177 extern struct inode_operations isofs_dir_inode_operations;
178 extern const struct file_operations isofs_dir_operations;
179 extern const struct address_space_operations isofs_symlink_aops;
180 extern struct export_operations isofs_export_ops;