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, 3 deletions

diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 1bff92ad4744..e975d7180a88 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -1429,7 +1429,7 @@ static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio,
         ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0);
         BUG_ON(ret);
 
-        if (!(rw & (1 << BIO_RW))) {
+        if (!(rw & REQ_WRITE)) {
                 if (bio_flags & EXTENT_BIO_COMPRESSED) {
                         return btrfs_submit_compressed_read(inode, bio,
                                                     mirror_num, bio_flags);
@@ -1841,7 +1841,7 @@ static int btrfs_io_failed_hook(struct bio *failed_bio,
         bio->bi_size = 0;
 
         bio_add_page(bio, page, failrec->len, start - page_offset(page));
-        if (failed_bio->bi_rw & (1 << BIO_RW))
+        if (failed_bio->bi_rw & REQ_WRITE)
                 rw = WRITE;
         else
                 rw = READ;
@@ -5642,7 +5642,7 @@ static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode,
         struct bio_vec *bvec = bio->bi_io_vec;
         u64 start;
         int skip_sum;
-        int write = rw & (1 << BIO_RW);
+        int write = rw & REQ_WRITE;
         int ret = 0;
 
         skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM;