block: change the request allocation/congestion logic to be sync/async based

This makes sure that we never wait on async IO for sync requests, instead
of doing the split on writes vs reads.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 5 deletions

diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index be68c956a660..493b468a5035 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -284,12 +284,12 @@ static wait_queue_head_t congestion_wqh[2] = {
         };
 
 
-void clear_bdi_congested(struct backing_dev_info *bdi, int rw)
+void clear_bdi_congested(struct backing_dev_info *bdi, int sync)
 {
         enum bdi_state bit;
-        wait_queue_head_t *wqh = &congestion_wqh[rw];
+        wait_queue_head_t *wqh = &congestion_wqh[sync];
 
-        bit = (rw == WRITE) ? BDI_write_congested : BDI_read_congested;
+        bit = sync ? BDI_sync_congested : BDI_async_congested;
         clear_bit(bit, &bdi->state);
         smp_mb__after_clear_bit();
         if (waitqueue_active(wqh))
@@ -297,11 +297,11 @@ void clear_bdi_congested(struct backing_dev_info *bdi, int rw)
 }
 EXPORT_SYMBOL(clear_bdi_congested);
 
-void set_bdi_congested(struct backing_dev_info *bdi, int rw)
+void set_bdi_congested(struct backing_dev_info *bdi, int sync)
 {
         enum bdi_state bit;
 
-        bit = (rw == WRITE) ? BDI_write_congested : BDI_read_congested;
+        bit = sync ? BDI_sync_congested : BDI_async_congested;
         set_bit(bit, &bdi->state);
 }
 EXPORT_SYMBOL(set_bdi_congested);