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         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);