bcache: do not subtract sectors_to_gc for bypassed IO

commit 69daf03adef5f7bc13e0ac86b4b8007df1767aab upstream.

Since bypassed IOs use no bucket, so do not subtract sectors_to_gc to
trigger gc thread.

Signed-off-by: tang.junhui <tang.junhui@zte.com.cn>
Acked-by: Coly Li <colyli@suse.de>
Reviewed-by: Eric Wheeler <bcache@linux.ewheeler.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index 2410df1..6c4c7ca 100644 (file)
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -196,12 +196,12 @@ static void bch_data_insert_start(struct closure *cl)
        struct data_insert_op *op = container_of(cl, struct data_insert_op, cl);
        struct bio *bio = op->bio, *n;
 
-       if (atomic_sub_return(bio_sectors(bio), &op->c->sectors_to_gc) < 0)
-               wake_up_gc(op->c);
-
        if (op->bypass)
                return bch_data_invalidate(cl);
 
+       if (atomic_sub_return(bio_sectors(bio), &op->c->sectors_to_gc) < 0)
+               wake_up_gc(op->c);
+
        /*
         * Journal writes are marked REQ_FLUSH; if the original write was a
         * flush, it'll wait on the journal write.