block: unify flags for struct bio and struct request

Remove the current bio flags and reuse the request flags for the bio, too.
This allows to more easily trace the type of I/O from the filesystem
down to the block driver.  There were two flags in the bio that were
missing in the requests:  BIO_RW_UNPLUG and BIO_RW_AHEAD.  Also I've
renamed two request flags that had a superflous RW in them.

Note that the flags are in bio.h despite having the REQ_ name - as
blkdev.h includes bio.h that is the only way to go for now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index a5c08b082edb..0a8cd3484791 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1114,7 +1114,7 @@ static int atapi_drain_needed(struct request *rq)
         if (likely(rq->cmd_type != REQ_TYPE_BLOCK_PC))
                 return 0;
 
-        if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_RW))
+        if (!blk_rq_bytes(rq) || (rq->cmd_flags & REQ_WRITE))
                 return 0;
 
         return atapi_cmd_type(rq->cmd[0]) == ATAPI_MISC;