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libceph: isolate kmap() call in write_partial_msg_pages()
In write_partial_msg_pages(), every case now does an identical call to kmap(page). Instead, just call it once inside the CRC-computing block where it's needed. Move the definition of kaddr inside that block, and make it a (char *) to ensure portable pointer arithmetic. We still don't kunmap() it until after the sendpage() call, in case that also ends up needing to use the mapping. Signed-off-by: Alex Elder <[email protected]> Reviewed-by: Sage Weil <[email protected]>
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