endian.h
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:3k
- /*
- * linux/fs/befs/endian.h
- *
- * Copyright (C) 2001 Will Dyson <will_dyson@pobox.com>
- *
- * Partially based on similar funtions in the sysv driver.
- */
- #ifndef LINUX_BEFS_ENDIAN
- #define LINUX_BEFS_ENDIAN
- #include <linux/byteorder/generic.h>
- #include "befs_fs.h"
- static inline u64
- fs64_to_cpu(const struct super_block *sb, u64 n)
- {
- if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
- return le64_to_cpu(n);
- else
- return be64_to_cpu(n);
- }
- static inline u64
- cpu_to_fs64(const struct super_block *sb, u64 n)
- {
- if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
- return cpu_to_le64(n);
- else
- return cpu_to_be64(n);
- }
- static inline u32
- fs32_to_cpu(const struct super_block *sb, u32 n)
- {
- if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
- return le32_to_cpu(n);
- else
- return be32_to_cpu(n);
- }
- static inline u32
- cpu_to_fs32(const struct super_block *sb, u32 n)
- {
- if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
- return cpu_to_le32(n);
- else
- return cpu_to_be32(n);
- }
- static inline u16
- fs16_to_cpu(const struct super_block *sb, u16 n)
- {
- if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
- return le16_to_cpu(n);
- else
- return be16_to_cpu(n);
- }
- static inline u16
- cpu_to_fs16(const struct super_block *sb, u16 n)
- {
- if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)
- return cpu_to_le16(n);
- else
- return cpu_to_be16(n);
- }
- /* Composite types below here */
- static inline befs_block_run
- fsrun_to_cpu(const struct super_block *sb, befs_block_run n)
- {
- befs_block_run run;
- if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {
- run.allocation_group = le32_to_cpu(n.allocation_group);
- run.start = le16_to_cpu(n.start);
- run.len = le16_to_cpu(n.len);
- } else {
- run.allocation_group = be32_to_cpu(n.allocation_group);
- run.start = be16_to_cpu(n.start);
- run.len = be16_to_cpu(n.len);
- }
- return run;
- }
- static inline befs_block_run
- cpu_to_fsrun(const struct super_block *sb, befs_block_run n)
- {
- befs_block_run run;
- if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {
- run.allocation_group = cpu_to_le32(n.allocation_group);
- run.start = cpu_to_le16(n.start);
- run.len = cpu_to_le16(n.len);
- } else {
- run.allocation_group = cpu_to_be32(n.allocation_group);
- run.start = cpu_to_be16(n.start);
- run.len = cpu_to_be16(n.len);
- }
- return run;
- }
- static inline befs_data_stream
- fsds_to_cpu(const struct super_block *sb, befs_data_stream n)
- {
- befs_data_stream data;
- int i;
- for (i = 0; i < BEFS_NUM_DIRECT_BLOCKS; ++i)
- data.direct[i] = fsrun_to_cpu(sb, n.direct[i]);
- data.max_direct_range = fs64_to_cpu(sb, n.max_direct_range);
- data.indirect = fsrun_to_cpu(sb, n.indirect);
- data.max_indirect_range = fs64_to_cpu(sb, n.max_indirect_range);
- data.double_indirect = fsrun_to_cpu(sb, n.double_indirect);
- data.max_double_indirect_range = fs64_to_cpu(sb,
- n.
- max_double_indirect_range);
- data.size = fs64_to_cpu(sb, n.size);
- return data;
- }
- #endif //LINUX_BEFS_ENDIAN