fs/qnx6/qnx6.h

   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);