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qnx6.h
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1 /*
2  * QNX6 file system, Linux implementation.
3  *
4  * Version : 1.0.0
5  *
6  * History :
7  *
8  * 01-02-2012 by Kai Bankett ([email protected]) : first release.
9  * 16-02-2012 page map extension by Al Viro
10  *
11  */
12 
13 #include <linux/fs.h>
14 #include <linux/pagemap.h>
15 
16 typedef __u16 __bitwise __fs16;
17 typedef __u32 __bitwise __fs32;
18 typedef __u64 __bitwise __fs64;
19 
20 #include <linux/qnx6_fs.h>
21 
22 #ifdef CONFIG_QNX6FS_DEBUG
23 #define QNX6DEBUG(X) printk X
24 #else
25 #define QNX6DEBUG(X) (void) 0
26 #endif
27 
28 struct qnx6_sb_info {
29  struct buffer_head *sb_buf; /* superblock buffer */
30  struct qnx6_super_block *sb; /* our superblock */
31  int s_blks_off; /* blkoffset fs-startpoint */
32  int s_ptrbits; /* indirect pointer bitfield */
33  unsigned long s_mount_opt; /* all mount options */
34  int s_bytesex; /* holds endianess info */
35  struct inode * inodes;
36  struct inode * longfile;
37 };
38 
39 struct qnx6_inode_info {
40  __fs32 di_block_ptr[QNX6_NO_DIRECT_POINTERS];
41  __u8 di_filelevels;
42  __u32 i_dir_start_lookup;
43  struct inode vfs_inode;
44 };
45 
46 extern struct inode *qnx6_iget(struct super_block *sb, unsigned ino);
47 extern struct dentry *qnx6_lookup(struct inode *dir, struct dentry *dentry,
48  unsigned int flags);
49 
50 #ifdef CONFIG_QNX6FS_DEBUG
51 extern void qnx6_superblock_debug(struct qnx6_super_block *,
52  struct super_block *);
53 #endif
54 
55 extern const struct inode_operations qnx6_dir_inode_operations;
56 extern const struct file_operations qnx6_dir_operations;
57 
58 static inline struct qnx6_sb_info *QNX6_SB(struct super_block *sb)
59 {
60  return sb->s_fs_info;
61 }
62 
63 static inline struct qnx6_inode_info *QNX6_I(struct inode *inode)
64 {
65  return container_of(inode, struct qnx6_inode_info, vfs_inode);
66 }
67 
68 #define clear_opt(o, opt) (o &= ~(QNX6_MOUNT_##opt))
69 #define set_opt(o, opt) (o |= (QNX6_MOUNT_##opt))
70 #define test_opt(sb, opt) (QNX6_SB(sb)->s_mount_opt & \
71  QNX6_MOUNT_##opt)
72 enum {
73  BYTESEX_LE,
74  BYTESEX_BE,
75 };
76 
77 static inline __u64 fs64_to_cpu(struct qnx6_sb_info *sbi, __fs64 n)
78 {
79  if (sbi->s_bytesex == BYTESEX_LE)
80  return le64_to_cpu((__force __le64)n);
81  else
82  return be64_to_cpu((__force __be64)n);
83 }
84 
85 static inline __fs64 cpu_to_fs64(struct qnx6_sb_info *sbi, __u64 n)
86 {
87  if (sbi->s_bytesex == BYTESEX_LE)
88  return (__force __fs64)cpu_to_le64(n);
89  else
90  return (__force __fs64)cpu_to_be64(n);
91 }
92 
93 static inline __u32 fs32_to_cpu(struct qnx6_sb_info *sbi, __fs32 n)
94 {
95  if (sbi->s_bytesex == BYTESEX_LE)
96  return le32_to_cpu((__force __le32)n);
97  else
98  return be32_to_cpu((__force __be32)n);
99 }
100 
101 static inline __fs32 cpu_to_fs32(struct qnx6_sb_info *sbi, __u32 n)
102 {
103  if (sbi->s_bytesex == BYTESEX_LE)
104  return (__force __fs32)cpu_to_le32(n);
105  else
106  return (__force __fs32)cpu_to_be32(n);
107 }
108 
109 static inline __u16 fs16_to_cpu(struct qnx6_sb_info *sbi, __fs16 n)
110 {
111  if (sbi->s_bytesex == BYTESEX_LE)
112  return le16_to_cpu((__force __le16)n);
113  else
114  return be16_to_cpu((__force __be16)n);
115 }
116 
117 static inline __fs16 cpu_to_fs16(struct qnx6_sb_info *sbi, __u16 n)
118 {
119  if (sbi->s_bytesex == BYTESEX_LE)
120  return (__force __fs16)cpu_to_le16(n);
121  else
122  return (__force __fs16)cpu_to_be16(n);
123 }
124 
125 extern struct qnx6_super_block *qnx6_mmi_fill_super(struct super_block *s,
126  int silent);
127 
128 static inline void qnx6_put_page(struct page *page)
129 {
130  kunmap(page);
131  page_cache_release(page);
132 }
133 
134 extern unsigned qnx6_find_entry(int len, struct inode *dir, const char *name,
135  struct page **res_page);
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