blk-wbt: don't throttle discard or write zeroes

Both of these are metadata only commands that are not issued by the
writeback code and not directly relevant to the writeback bandwith.

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

diff --git a/block/blk-wbt.c b/block/blk-wbt.c
index d500e43da5d9ccdf2476107ac6fd69da3e2636c7..6e82769f4042c2f57af7976b1b7b4342eea1306d 100644 (file)
--- a/block/blk-wbt.c
+++ b/block/blk-wbt.c
@@ -575,10 +575,9 @@ static inline bool wbt_should_throttle(struct rq_wb *rwb, struct bio *bio)
        const int op = bio_op(bio);
 
        /*
-        * If not a WRITE (or a discard or write zeroes), do nothing
+        * If not a WRITE, do nothing
         */
-       if (!(op == REQ_OP_WRITE || op == REQ_OP_DISCARD ||
-                               op == REQ_OP_WRITE_ZEROES))
+       if (op != REQ_OP_WRITE)
                return false;
 
        /*