swab.h 2.5 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. /*
  3. * linux/fs/ufs/swab.h
  4. *
  5. * Copyright (C) 1997, 1998 Francois-Rene Rideau <fare@tunes.org>
  6. * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz>
  7. * Copyright (C) 2001 Christoph Hellwig <hch@infradead.org>
  8. */
  9. #ifndef _UFS_SWAB_H
  10. #define _UFS_SWAB_H
  11. /*
  12. * Notes:
  13. * HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes
  14. * in case there are ufs implementations that have strange bytesexes,
  15. * you'll need to modify code here as well as in ufs_super.c and ufs_fs.h
  16. * to support them.
  17. */
  18. enum {
  19. BYTESEX_LE,
  20. BYTESEX_BE
  21. };
  22. static inline u64
  23. fs64_to_cpu(struct super_block *sbp, __fs64 n)
  24. {
  25. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  26. return le64_to_cpu((__force __le64)n);
  27. else
  28. return be64_to_cpu((__force __be64)n);
  29. }
  30. static inline __fs64
  31. cpu_to_fs64(struct super_block *sbp, u64 n)
  32. {
  33. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  34. return (__force __fs64)cpu_to_le64(n);
  35. else
  36. return (__force __fs64)cpu_to_be64(n);
  37. }
  38. static inline u32
  39. fs32_to_cpu(struct super_block *sbp, __fs32 n)
  40. {
  41. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  42. return le32_to_cpu((__force __le32)n);
  43. else
  44. return be32_to_cpu((__force __be32)n);
  45. }
  46. static inline __fs32
  47. cpu_to_fs32(struct super_block *sbp, u32 n)
  48. {
  49. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  50. return (__force __fs32)cpu_to_le32(n);
  51. else
  52. return (__force __fs32)cpu_to_be32(n);
  53. }
  54. static inline void
  55. fs32_add(struct super_block *sbp, __fs32 *n, int d)
  56. {
  57. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  58. le32_add_cpu((__le32 *)n, d);
  59. else
  60. be32_add_cpu((__be32 *)n, d);
  61. }
  62. static inline void
  63. fs32_sub(struct super_block *sbp, __fs32 *n, int d)
  64. {
  65. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  66. le32_add_cpu((__le32 *)n, -d);
  67. else
  68. be32_add_cpu((__be32 *)n, -d);
  69. }
  70. static inline u16
  71. fs16_to_cpu(struct super_block *sbp, __fs16 n)
  72. {
  73. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  74. return le16_to_cpu((__force __le16)n);
  75. else
  76. return be16_to_cpu((__force __be16)n);
  77. }
  78. static inline __fs16
  79. cpu_to_fs16(struct super_block *sbp, u16 n)
  80. {
  81. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  82. return (__force __fs16)cpu_to_le16(n);
  83. else
  84. return (__force __fs16)cpu_to_be16(n);
  85. }
  86. static inline void
  87. fs16_add(struct super_block *sbp, __fs16 *n, int d)
  88. {
  89. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  90. le16_add_cpu((__le16 *)n, d);
  91. else
  92. be16_add_cpu((__be16 *)n, d);
  93. }
  94. static inline void
  95. fs16_sub(struct super_block *sbp, __fs16 *n, int d)
  96. {
  97. if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
  98. le16_add_cpu((__le16 *)n, -d);
  99. else
  100. be16_add_cpu((__be16 *)n, -d);
  101. }
  102. #endif /* _UFS_SWAB_H */