Btrfs: Endianess bug fix for v0.13 with kernels

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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>

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This commit is contained in:

Miguel 2008-04-11 15:45:51 -04:00 • committed by Chris Mason

parent 587f77043a

commit a5eb62e345

3 changed files with 24 additions and 9 deletions

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17

fs/btrfs/crc32c.h

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4

fs/btrfs/disk-io.c

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12

fs/btrfs/extent-tree.c

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