| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | |
| 59 | static inline struct qnx6_sb_info *QNX6_SB(struct super_block *sb) |
| 60 | { |
| 61 | return sb->s_fs_info; |
| 62 | } |
| 63 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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 | |
| 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); |