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block: unify flags for struct bio and struct request

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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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Christoph Hellwig 2010-08-07 18:20:39 +02:00 • committed by Jens Axboe
commit 7b6d91daee
47 changed files with 242 additions and 289 deletions
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5
fs/bio.c
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@ -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);