GNU Linux-libre 4.9.308-gnu1
[releases.git] / fs / qnx6 / qnx6.h
1 /*
2  * QNX6 file system, Linux implementation.
3  *
4  * Version : 1.0.0
5  *
6  * History :
7  *
8  * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
9  * 16-02-2012 page map extension by Al Viro
10  *
11  */
12
13 #ifdef pr_fmt
14 #undef pr_fmt
15 #endif
16
17 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
18
19 #include <linux/fs.h>
20 #include <linux/pagemap.h>
21
22 typedef __u16 __bitwise __fs16;
23 typedef __u32 __bitwise __fs32;
24 typedef __u64 __bitwise __fs64;
25
26 #include <linux/qnx6_fs.h>
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         put_page(page);
132 }
133
134 extern unsigned qnx6_find_entry(int len, struct inode *dir, const char *name,
135                                 struct page **res_page);