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 10 #ifndef _UFS_SWAB_H 11 #define _UFS_SWAB_H 12 13 /* 14 * Notes: 15 * HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes 16 * in case there are ufs implementations that have strange bytesexes, 17 * you'll need to modify code here as well as in ufs_super.c and ufs_fs.h 18 * to support them. 19 */ 20 21 enum { 22 BYTESEX_LE, 23 BYTESEX_BE 24 }; 25 26 static inline u64 27 fs64_to_cpu(struct super_block *sbp, __fs64 n) 28 { 29 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 30 return le64_to_cpu((__force __le64)n); 31 else 32 return be64_to_cpu((__force __be64)n); 33 } 34 35 static inline __fs64 36 cpu_to_fs64(struct super_block *sbp, u64 n) 37 { 38 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 39 return (__force __fs64)cpu_to_le64(n); 40 else 41 return (__force __fs64)cpu_to_be64(n); 42 } 43 44 static inline u32 45 fs32_to_cpu(struct super_block *sbp, __fs32 n) 46 { 47 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 48 return le32_to_cpu((__force __le32)n); 49 else 50 return be32_to_cpu((__force __be32)n); 51 } 52 53 static inline __fs32 54 cpu_to_fs32(struct super_block *sbp, u32 n) 55 { 56 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 57 return (__force __fs32)cpu_to_le32(n); 58 else 59 return (__force __fs32)cpu_to_be32(n); 60 } 61 62 static inline void 63 fs32_add(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 71 static inline void 72 fs32_sub(struct super_block *sbp, __fs32 *n, int d) 73 { 74 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 75 le32_add_cpu((__le32 *)n, -d); 76 else 77 be32_add_cpu((__be32 *)n, -d); 78 } 79 80 static inline u16 81 fs16_to_cpu(struct super_block *sbp, __fs16 n) 82 { 83 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 84 return le16_to_cpu((__force __le16)n); 85 else 86 return be16_to_cpu((__force __be16)n); 87 } 88 89 static inline __fs16 90 cpu_to_fs16(struct super_block *sbp, u16 n) 91 { 92 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 93 return (__force __fs16)cpu_to_le16(n); 94 else 95 return (__force __fs16)cpu_to_be16(n); 96 } 97 98 static inline void 99 fs16_add(struct super_block *sbp, __fs16 *n, int d) 100 { 101 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 102 le16_add_cpu((__le16 *)n, d); 103 else 104 be16_add_cpu((__be16 *)n, d); 105 } 106 107 static inline void 108 fs16_sub(struct super_block *sbp, __fs16 *n, int d) 109 { 110 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 111 le16_add_cpu((__le16 *)n, -d); 112 else 113 be16_add_cpu((__be16 *)n, -d); 114 } 115 116 #endif /* _UFS_SWAB_H */ 117