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, 6 insertions, 6 deletions

diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index bee52abb8a4d..0ec2c594868e 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -24,8 +24,8 @@ struct dentry;
  */
 enum bdi_state {
         BDI_pdflush,            /* A pdflush thread is working this device */
-        BDI_write_congested,    /* The write queue is getting full */
-        BDI_read_congested,     /* The read queue is getting full */
+        BDI_async_congested,    /* The async (write) queue is getting full */
+        BDI_sync_congested,     /* The sync queue is getting full */
         BDI_unused,             /* Available bits start here */
 };
 
@@ -215,18 +215,18 @@ static inline int bdi_congested(struct backing_dev_info *bdi, int bdi_bits)
 
 static inline int bdi_read_congested(struct backing_dev_info *bdi)
 {
-        return bdi_congested(bdi, 1 << BDI_read_congested);
+        return bdi_congested(bdi, 1 << BDI_sync_congested);
 }
 
 static inline int bdi_write_congested(struct backing_dev_info *bdi)
 {
-        return bdi_congested(bdi, 1 << BDI_write_congested);
+        return bdi_congested(bdi, 1 << BDI_async_congested);
 }
 
 static inline int bdi_rw_congested(struct backing_dev_info *bdi)
 {
-        return bdi_congested(bdi, (1 << BDI_read_congested)|
-                                  (1 << BDI_write_congested));
+        return bdi_congested(bdi, (1 << BDI_sync_congested) |
+                                  (1 << BDI_async_congested));
 }
 
 void clear_bdi_congested(struct backing_dev_info *bdi, int rw);