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>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index cb20d0b..1893af6 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -353,7 +353,7 @@
/* an empty barrier - all done */
bio_endio(bio, 0);
else {
- bio->bi_rw &= ~(1<<BIO_RW_BARRIER);
+ bio->bi_rw &= ~REQ_HARDBARRIER;
if (mddev->pers->make_request(mddev, bio))
generic_make_request(bio);
mddev->barrier = POST_REQUEST_BARRIER;
@@ -675,11 +675,11 @@
* if zero is reached.
* If an error occurred, call md_error
*
- * As we might need to resubmit the request if BIO_RW_BARRIER
+ * As we might need to resubmit the request if REQ_HARDBARRIER
* causes ENOTSUPP, we allocate a spare bio...
*/
struct bio *bio = bio_alloc(GFP_NOIO, 1);
- int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG);
+ int rw = REQ_WRITE | REQ_SYNC | REQ_UNPLUG;
bio->bi_bdev = rdev->bdev;
bio->bi_sector = sector;
@@ -691,7 +691,7 @@
atomic_inc(&mddev->pending_writes);
if (!test_bit(BarriersNotsupp, &rdev->flags)) {
struct bio *rbio;
- rw |= (1<<BIO_RW_BARRIER);
+ rw |= REQ_HARDBARRIER;
rbio = bio_clone(bio, GFP_NOIO);
rbio->bi_private = bio;
rbio->bi_end_io = super_written_barrier;
@@ -736,7 +736,7 @@
struct completion event;
int ret;
- rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG);
+ rw |= REQ_SYNC | REQ_UNPLUG;
bio->bi_bdev = bdev;
bio->bi_sector = sector;