bcache: update bio->bi_opf bypass/writeback REQ_ flag hints
Flag for bypass if the IO is for read-ahead or background, unless the read-ahead request is for metadata (eg, from gfs2). Bypass if: bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND) && !(bio->bi_opf & REQ_META)) Writeback if: op_is_sync(bio->bi_opf) || bio->bi_opf & (REQ_META|REQ_PRIO) Signed-off-by: NEric Wheeler <bcache@linux.ewheeler.net> Reviewed-by: NColy Li <colyli@suse.de> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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