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, 3 insertions, 2 deletions

diff --git a/fs/bio.c b/fs/bio.c
index e7bf6ca64dcf..8abb2dfb2e7c 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -843,7 +843,8 @@ struct bio *bio_copy_user_iov(struct request_queue *q,
         if (!bio)
                 goto out_bmd;
 
-        bio->bi_rw |= (!write_to_vm << BIO_RW);
+        if (!write_to_vm)
+                bio->bi_rw |= REQ_WRITE;
 
         ret = 0;
 
@@ -1024,7 +1025,7 @@ static struct bio *__bio_map_user_iov(struct request_queue *q,
          * set data direction, and check if mapped pages need bouncing
          */
         if (!write_to_vm)
-                bio->bi_rw |= (1 << BIO_RW);
+                bio->bi_rw |= REQ_WRITE;
 
         bio->bi_bdev = bdev;
         bio->bi_flags |= (1 << BIO_USER_MAPPED);