block: check virt boundary in bio_will_gap()

In the following patch, the way for figuring out
the last bvec will be changed with a bit cost introduced,
so return immediately if the queue doesn't have virt
boundary limit. Actually most of devices have not
this limit.

Reviewed-by: Sagi Grimberg <sagig@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 4571ef1a12a968ea62a78b87371c83a07e89d8e9..cd06a41581b321094928569da4814cef74b3f0ae 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1372,6 +1372,13 @@ static inline void put_dev_sector(Sector p)
        page_cache_release(p.v);
 }
 
+static inline bool __bvec_gap_to_prev(struct request_queue *q,
+                               struct bio_vec *bprv, unsigned int offset)
+{
+       return offset ||
+               ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
+}
+
 /*
  * Check if adding a bio_vec after bprv with offset would create a gap in
  * the SG list. Most drivers don't care about this, but some do.
@@ -1381,18 +1388,17 @@ static inline bool bvec_gap_to_prev(struct request_queue *q,
 {
        if (!queue_virt_boundary(q))
                return false;
-       return offset ||
-               ((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
+       return __bvec_gap_to_prev(q, bprv, offset);
 }
 
 static inline bool bio_will_gap(struct request_queue *q, struct bio *prev,
                         struct bio *next)
 {
-       if (!bio_has_data(prev))
+       if (!bio_has_data(prev) || !queue_virt_boundary(q))
                return false;
 
-       return bvec_gap_to_prev(q, &prev->bi_io_vec[prev->bi_vcnt - 1],
-                               next->bi_io_vec[0].bv_offset);
+       return __bvec_gap_to_prev(q, &prev->bi_io_vec[prev->bi_vcnt - 1],
+                                 next->bi_io_vec[0].bv_offset);
 }
 
 static inline bool req_gap_back_merge(struct request *req, struct bio *bio)