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a5eb62e345
Fix for a endianess BUG when using btrfs v0.13 with kernels older than 2.6.23 Problem: Has of v0.13, btrfs-progs is using crc32c.c equivalent to the one found on linux-2.6.23/lib/libcrc32c.c Since crc32c_le() changed in linux-2.6.23, when running btrfs v0.13 with older kernels we have a missmatch between the versions of crc32c_le() from btrfs-progs and libcrc32c in the kernel. This missmatch causes a bug when using btrfs on big endian machines. Solution: btrfs_crc32c() macro that when compiling for kernels older than 2.6.23, does endianess conversion to parameters and return value of crc32c(). This endianess conversion nullifies the differences in implementation of crc32c_le(). If kernel 2.6.23 or better, it calls crc32c(). Signed-off-by: Miguel Sousa Filipe <miguel.filipe@gmail.com> --- Signed-off-by: Chris Mason <chris.mason@oracle.com>
17 lines
534 B
C
17 lines
534 B
C
#include <asm/byteorder.h>
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#include <linux/crc32c.h>
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#include <linux/version.h>
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/**
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* implementation of crc32c_le() changed in linux-2.6.23,
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* has of v0.13 btrfs-progs is using the latest version.
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* We must workaround older implementations of crc32c_le()
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* found on older kernel versions.
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*/
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#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
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#define btrfs_crc32c(seed, data, length) \
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__cpu_to_le32( crc32c( __le32_to_cpu(seed), data, length) )
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#else
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#define btrfs_crc32c(seed, data, length) \
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crc32c(seed, data, length)
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#endif
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