fs/affs/file.c: add support to O_DIRECT
Based on ext2_direct_IO Tested with O_DIRECT file open and sysbench/mariadb with 1% written queries improvement (update_non_index test) on a volume created with mkaffs. Signed-off-by: Fabian Frederick <fabf@skynet.be> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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