1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * QNX6 file system, Linux implementation.
4  *
5  * Version : 1.0.0
6  *
7  * History :
8  *
9  * 01-02-2012 by Kai Bankett (chaosman@ontika.net) : first release.
10  * 16-02-2012 page map extension by Al Viro
11  *
12  */
13 
14 #ifdef pr_fmt
15 #undef pr_fmt
16 #endif
17 
18 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
19 
20 #include <linux/fs.h>
21 #include <linux/pagemap.h>
22 
23 typedef __u16 __bitwise __fs16;
24 typedef __u32 __bitwise __fs32;
25 typedef __u64 __bitwise __fs64;
26 
27 #include <linux/qnx6_fs.h>
28 
29 struct qnx6_sb_info {
30 	struct buffer_head	*sb_buf;	/* superblock buffer */
31 	struct qnx6_super_block	*sb;		/* our superblock */
32 	int			s_blks_off;	/* blkoffset fs-startpoint */
33 	int			s_ptrbits;	/* indirect pointer bitfield */
34 	unsigned long		s_mount_opt;	/* all mount options */
35 	int			s_bytesex;	/* holds endianess info */
36 	struct inode *		inodes;
37 	struct inode *		longfile;
38 };
39 
40 struct qnx6_inode_info {
41 	__fs32			di_block_ptr[QNX6_NO_DIRECT_POINTERS];
42 	__u8			di_filelevels;
43 	__u32			i_dir_start_lookup;
44 	struct inode		vfs_inode;
45 };
46 
47 extern struct inode *qnx6_iget(struct super_block *sb, unsigned ino);
48 extern struct dentry *qnx6_lookup(struct inode *dir, struct dentry *dentry,
49 					unsigned int flags);
50 
51 #ifdef CONFIG_QNX6FS_DEBUG
52 extern void qnx6_superblock_debug(struct qnx6_super_block *,
53 						struct super_block *);
54 #endif
55 
56 extern const struct inode_operations qnx6_dir_inode_operations;
57 extern const struct file_operations qnx6_dir_operations;
58 
QNX6_SB(struct super_block * sb)59 static inline struct qnx6_sb_info *QNX6_SB(struct super_block *sb)
60 {
61 	return sb->s_fs_info;
62 }
63 
QNX6_I(struct inode * inode)64 static inline struct qnx6_inode_info *QNX6_I(struct inode *inode)
65 {
66 	return container_of(inode, struct qnx6_inode_info, vfs_inode);
67 }
68 
69 #define clear_opt(o, opt)		(o &= ~(QNX6_MOUNT_##opt))
70 #define set_opt(o, opt)			(o |= (QNX6_MOUNT_##opt))
71 #define test_opt(sb, opt)		(QNX6_SB(sb)->s_mount_opt & \
72 					 QNX6_MOUNT_##opt)
73 enum {
74 	BYTESEX_LE,
75 	BYTESEX_BE,
76 };
77 
fs64_to_cpu(struct qnx6_sb_info * sbi,__fs64 n)78 static inline __u64 fs64_to_cpu(struct qnx6_sb_info *sbi, __fs64 n)
79 {
80 	if (sbi->s_bytesex == BYTESEX_LE)
81 		return le64_to_cpu((__force __le64)n);
82 	else
83 		return be64_to_cpu((__force __be64)n);
84 }
85 
cpu_to_fs64(struct qnx6_sb_info * sbi,__u64 n)86 static inline __fs64 cpu_to_fs64(struct qnx6_sb_info *sbi, __u64 n)
87 {
88 	if (sbi->s_bytesex == BYTESEX_LE)
89 		return (__force __fs64)cpu_to_le64(n);
90 	else
91 		return (__force __fs64)cpu_to_be64(n);
92 }
93 
fs32_to_cpu(struct qnx6_sb_info * sbi,__fs32 n)94 static inline __u32 fs32_to_cpu(struct qnx6_sb_info *sbi, __fs32 n)
95 {
96 	if (sbi->s_bytesex == BYTESEX_LE)
97 		return le32_to_cpu((__force __le32)n);
98 	else
99 		return be32_to_cpu((__force __be32)n);
100 }
101 
cpu_to_fs32(struct qnx6_sb_info * sbi,__u32 n)102 static inline __fs32 cpu_to_fs32(struct qnx6_sb_info *sbi, __u32 n)
103 {
104 	if (sbi->s_bytesex == BYTESEX_LE)
105 		return (__force __fs32)cpu_to_le32(n);
106 	else
107 		return (__force __fs32)cpu_to_be32(n);
108 }
109 
fs16_to_cpu(struct qnx6_sb_info * sbi,__fs16 n)110 static inline __u16 fs16_to_cpu(struct qnx6_sb_info *sbi, __fs16 n)
111 {
112 	if (sbi->s_bytesex == BYTESEX_LE)
113 		return le16_to_cpu((__force __le16)n);
114 	else
115 		return be16_to_cpu((__force __be16)n);
116 }
117 
cpu_to_fs16(struct qnx6_sb_info * sbi,__u16 n)118 static inline __fs16 cpu_to_fs16(struct qnx6_sb_info *sbi, __u16 n)
119 {
120 	if (sbi->s_bytesex == BYTESEX_LE)
121 		return (__force __fs16)cpu_to_le16(n);
122 	else
123 		return (__force __fs16)cpu_to_be16(n);
124 }
125 
126 extern struct qnx6_super_block *qnx6_mmi_fill_super(struct super_block *s,
127 						    int silent);
128 
qnx6_put_page(struct page * page)129 static inline void qnx6_put_page(struct page *page)
130 {
131 	kunmap(page);
132 	put_page(page);
133 }
134 
135 extern unsigned qnx6_find_entry(int len, struct inode *dir, const char *name,
136 				struct page **res_page);
137