SCSI: fix queue cleanup race before queue initialization is done

[mirror_ubuntu-bionic-kernel.git] / block / blk.h

diff --git a/block/blk.h b/block/blk.h
index 442098aa9463a37dad0dfccb1718eea65be6cdb3..e8d598e4a948de5d4e5d9ff298166b2fb6cacbc0 100644 (file)
--- a/block/blk.h
+++ b/block/blk.h
@@ -245,6 +245,16 @@ static inline void req_set_nomerge(struct request_queue *q, struct request *req)
                q->last_merge = NULL;
 }
 
+/*
+ * The max size one bio can handle is UINT_MAX becasue bvec_iter.bi_size
+ * is defined as 'unsigned int', meantime it has to aligned to with logical
+ * block size which is the minimum accepted unit by hardware.
+ */
+static inline unsigned int bio_allowed_max_sectors(struct request_queue *q)
+{
+       return round_down(UINT_MAX, queue_logical_block_size(q)) >> 9;
+}
+
 /*
  * Internal io_context interface
  */