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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/fs/befs/endian.h
15109 views
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/*

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 * linux/fs/befs/endian.h

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 *

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 * Copyright (C) 2001 Will Dyson <[email protected]>

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 *

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 * Partially based on similar funtions in the sysv driver.

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 */

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#ifndef LINUX_BEFS_ENDIAN

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#define LINUX_BEFS_ENDIAN

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#include <asm/byteorder.h>

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static inline u64

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fs64_to_cpu(const struct super_block *sb, fs64 n)

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{

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	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)

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		return le64_to_cpu((__force __le64)n);

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	else

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		return be64_to_cpu((__force __be64)n);

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}

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static inline fs64

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cpu_to_fs64(const struct super_block *sb, u64 n)

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{

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	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)

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		return (__force fs64)cpu_to_le64(n);

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	else

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		return (__force fs64)cpu_to_be64(n);

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}

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static inline u32

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fs32_to_cpu(const struct super_block *sb, fs32 n)

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{

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	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)

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		return le32_to_cpu((__force __le32)n);

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	else

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		return be32_to_cpu((__force __be32)n);

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}

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static inline fs32

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cpu_to_fs32(const struct super_block *sb, u32 n)

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{

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	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)

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		return (__force fs32)cpu_to_le32(n);

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	else

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		return (__force fs32)cpu_to_be32(n);

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}

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static inline u16

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fs16_to_cpu(const struct super_block *sb, fs16 n)

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{

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	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)

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		return le16_to_cpu((__force __le16)n);

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	else

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		return be16_to_cpu((__force __be16)n);

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}

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static inline fs16

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cpu_to_fs16(const struct super_block *sb, u16 n)

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{

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	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE)

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		return (__force fs16)cpu_to_le16(n);

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	else

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		return (__force fs16)cpu_to_be16(n);

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}

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/* Composite types below here */

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static inline befs_block_run

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fsrun_to_cpu(const struct super_block *sb, befs_disk_block_run n)

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{

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	befs_block_run run;

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	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {

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		run.allocation_group = le32_to_cpu((__force __le32)n.allocation_group);

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		run.start = le16_to_cpu((__force __le16)n.start);

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		run.len = le16_to_cpu((__force __le16)n.len);

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	} else {

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		run.allocation_group = be32_to_cpu((__force __be32)n.allocation_group);

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		run.start = be16_to_cpu((__force __be16)n.start);

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		run.len = be16_to_cpu((__force __be16)n.len);

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	}

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	return run;

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}

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static inline befs_disk_block_run

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cpu_to_fsrun(const struct super_block *sb, befs_block_run n)

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{

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	befs_disk_block_run run;

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	if (BEFS_SB(sb)->byte_order == BEFS_BYTESEX_LE) {

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		run.allocation_group = cpu_to_le32(n.allocation_group);

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		run.start = cpu_to_le16(n.start);

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		run.len = cpu_to_le16(n.len);

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	} else {

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		run.allocation_group = cpu_to_be32(n.allocation_group);

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		run.start = cpu_to_be16(n.start);

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		run.len = cpu_to_be16(n.len);

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	}

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	return run;

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}

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static inline befs_data_stream

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fsds_to_cpu(const struct super_block *sb, const befs_disk_data_stream *n)

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{

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	befs_data_stream data;

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	int i;

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	for (i = 0; i < BEFS_NUM_DIRECT_BLOCKS; ++i)

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		data.direct[i] = fsrun_to_cpu(sb, n->direct[i]);

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	data.max_direct_range = fs64_to_cpu(sb, n->max_direct_range);

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	data.indirect = fsrun_to_cpu(sb, n->indirect);

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	data.max_indirect_range = fs64_to_cpu(sb, n->max_indirect_range);

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	data.double_indirect = fsrun_to_cpu(sb, n->double_indirect);

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	data.max_double_indirect_range = fs64_to_cpu(sb,

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						     n->

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						     max_double_indirect_range);

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	data.size = fs64_to_cpu(sb, n->size);

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	return data;

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}

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#endif				//LINUX_BEFS_ENDIAN

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