block: remove BLKDEV_IFL_WAIT

All the blkdev_issue_* helpers can only sanely be used for synchronous
caller.  To issue cache flushes or barriers asynchronously the caller needs
to set up a bio by itself with a completion callback to move the asynchronous
state machine ahead.  So drop the BLKDEV_IFL_WAIT flag that is always
specified when calling blkdev_issue_* and also remove the now unused flags
argument to blkdev_issue_flush and blkdev_issue_zeroout.  For
blkdev_issue_discard we need to keep it for the secure discard flag, which
gains a more descriptive name and loses the bitops vs flag confusion.

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

1 files changed, 2 insertions, 3 deletions

diff --git a/fs/gfs2/rgrp.c b/fs/gfs2/rgrp.c
index 379316472918..38b3ea1abacc 100644
--- a/fs/gfs2/rgrp.c
+++ b/fs/gfs2/rgrp.c
@@ -854,7 +854,7 @@ static void gfs2_rgrp_send_discards(struct gfs2_sbd *sdp, u64 offset,
                                 if ((start + nr_sects) != blk) {
                                         rv = blkdev_issue_discard(bdev, start,
                                                             nr_sects, GFP_NOFS,
-                                                            BLKDEV_IFL_WAIT);
+                                                            0);
                                         if (rv)
                                                 goto fail;
                                         nr_sects = 0;
@@ -868,8 +868,7 @@ start_new_extent:
                 }
         }
         if (nr_sects) {
-                rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS,
-                                         BLKDEV_IFL_WAIT);
+                rv = blkdev_issue_discard(bdev, start, nr_sects, GFP_NOFS, 0);
                 if (rv)
                         goto fail;
         }