1 /* 2 * linux/fs/ufs/swab.h 3 * 4 * Copyright (C) 1997, 1998 Francois-Rene Rideau <fare@tunes.org> 5 * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz> 6 * Copyright (C) 2001 Christoph Hellwig <hch@infradead.org> 7 */ 8 9 #ifndef _UFS_SWAB_H 10 #define _UFS_SWAB_H 11 12 /* 13 * Notes: 14 * HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes 15 * in case there are ufs implementations that have strange bytesexes, 16 * you'll need to modify code here as well as in ufs_super.c and ufs_fs.h 17 * to support them. 18 */ 19 20 enum { 21 BYTESEX_LE, 22 BYTESEX_BE 23 }; 24 25 static inline u64 fs64_to_cpu(struct super_block * sbp,__fs64 n)26 fs64_to_cpu(struct super_block *sbp, __fs64 n) 27 { 28 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 29 return le64_to_cpu((__force __le64)n); 30 else 31 return be64_to_cpu((__force __be64)n); 32 } 33 34 static inline __fs64 cpu_to_fs64(struct super_block * sbp,u64 n)35 cpu_to_fs64(struct super_block *sbp, u64 n) 36 { 37 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 38 return (__force __fs64)cpu_to_le64(n); 39 else 40 return (__force __fs64)cpu_to_be64(n); 41 } 42 43 static inline u32 fs32_to_cpu(struct super_block * sbp,__fs32 n)44 fs32_to_cpu(struct super_block *sbp, __fs32 n) 45 { 46 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 47 return le32_to_cpu((__force __le32)n); 48 else 49 return be32_to_cpu((__force __be32)n); 50 } 51 52 static inline __fs32 cpu_to_fs32(struct super_block * sbp,u32 n)53 cpu_to_fs32(struct super_block *sbp, u32 n) 54 { 55 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 56 return (__force __fs32)cpu_to_le32(n); 57 else 58 return (__force __fs32)cpu_to_be32(n); 59 } 60 61 static inline void fs32_add(struct super_block * sbp,__fs32 * n,int d)62 fs32_add(struct super_block *sbp, __fs32 *n, int d) 63 { 64 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 65 le32_add_cpu((__le32 *)n, d); 66 else 67 be32_add_cpu((__be32 *)n, d); 68 } 69 70 static inline void fs32_sub(struct super_block * sbp,__fs32 * n,int d)71 fs32_sub(struct super_block *sbp, __fs32 *n, int d) 72 { 73 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 74 le32_add_cpu((__le32 *)n, -d); 75 else 76 be32_add_cpu((__be32 *)n, -d); 77 } 78 79 static inline u16 fs16_to_cpu(struct super_block * sbp,__fs16 n)80 fs16_to_cpu(struct super_block *sbp, __fs16 n) 81 { 82 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 83 return le16_to_cpu((__force __le16)n); 84 else 85 return be16_to_cpu((__force __be16)n); 86 } 87 88 static inline __fs16 cpu_to_fs16(struct super_block * sbp,u16 n)89 cpu_to_fs16(struct super_block *sbp, u16 n) 90 { 91 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 92 return (__force __fs16)cpu_to_le16(n); 93 else 94 return (__force __fs16)cpu_to_be16(n); 95 } 96 97 static inline void fs16_add(struct super_block * sbp,__fs16 * n,int d)98 fs16_add(struct super_block *sbp, __fs16 *n, int d) 99 { 100 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 101 le16_add_cpu((__le16 *)n, d); 102 else 103 be16_add_cpu((__be16 *)n, d); 104 } 105 106 static inline void fs16_sub(struct super_block * sbp,__fs16 * n,int d)107 fs16_sub(struct super_block *sbp, __fs16 *n, int d) 108 { 109 if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE) 110 le16_add_cpu((__le16 *)n, -d); 111 else 112 be16_add_cpu((__be16 *)n, -d); 113 } 114 115 #endif /* _UFS_SWAB_H */ 116