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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /fs/ufs/swab.h
Initial import
Diffstat (limited to 'fs/ufs/swab.h')
-rw-r--r--fs/ufs/swab.h115
1 files changed, 115 insertions, 0 deletions
diff --git a/fs/ufs/swab.h b/fs/ufs/swab.h
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+++ b/fs/ufs/swab.h
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+/*
+ * linux/fs/ufs/swab.h
+ *
+ * Copyright (C) 1997, 1998 Francois-Rene Rideau <fare@tunes.org>
+ * Copyright (C) 1998 Jakub Jelinek <jj@ultra.linux.cz>
+ * Copyright (C) 2001 Christoph Hellwig <hch@infradead.org>
+ */
+
+#ifndef _UFS_SWAB_H
+#define _UFS_SWAB_H
+
+/*
+ * Notes:
+ * HERE WE ASSUME EITHER BIG OR LITTLE ENDIAN UFSes
+ * in case there are ufs implementations that have strange bytesexes,
+ * you'll need to modify code here as well as in ufs_super.c and ufs_fs.h
+ * to support them.
+ */
+
+enum {
+ BYTESEX_LE,
+ BYTESEX_BE
+};
+
+static inline u64
+fs64_to_cpu(struct super_block *sbp, __fs64 n)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ return le64_to_cpu((__force __le64)n);
+ else
+ return be64_to_cpu((__force __be64)n);
+}
+
+static inline __fs64
+cpu_to_fs64(struct super_block *sbp, u64 n)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ return (__force __fs64)cpu_to_le64(n);
+ else
+ return (__force __fs64)cpu_to_be64(n);
+}
+
+static inline u32
+fs32_to_cpu(struct super_block *sbp, __fs32 n)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ return le32_to_cpu((__force __le32)n);
+ else
+ return be32_to_cpu((__force __be32)n);
+}
+
+static inline __fs32
+cpu_to_fs32(struct super_block *sbp, u32 n)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ return (__force __fs32)cpu_to_le32(n);
+ else
+ return (__force __fs32)cpu_to_be32(n);
+}
+
+static inline void
+fs32_add(struct super_block *sbp, __fs32 *n, int d)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ le32_add_cpu((__le32 *)n, d);
+ else
+ be32_add_cpu((__be32 *)n, d);
+}
+
+static inline void
+fs32_sub(struct super_block *sbp, __fs32 *n, int d)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ le32_add_cpu((__le32 *)n, -d);
+ else
+ be32_add_cpu((__be32 *)n, -d);
+}
+
+static inline u16
+fs16_to_cpu(struct super_block *sbp, __fs16 n)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ return le16_to_cpu((__force __le16)n);
+ else
+ return be16_to_cpu((__force __be16)n);
+}
+
+static inline __fs16
+cpu_to_fs16(struct super_block *sbp, u16 n)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ return (__force __fs16)cpu_to_le16(n);
+ else
+ return (__force __fs16)cpu_to_be16(n);
+}
+
+static inline void
+fs16_add(struct super_block *sbp, __fs16 *n, int d)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ le16_add_cpu((__le16 *)n, d);
+ else
+ be16_add_cpu((__be16 *)n, d);
+}
+
+static inline void
+fs16_sub(struct super_block *sbp, __fs16 *n, int d)
+{
+ if (UFS_SB(sbp)->s_bytesex == BYTESEX_LE)
+ le16_add_cpu((__le16 *)n, -d);
+ else
+ be16_add_cpu((__be16 *)n, -d);
+}
+
+#endif /* _UFS_SWAB_H */