On 5/20/24 03:20, Nitesh Shetty wrote:
Upon arrival of source bio we merge these two bio's and send
corresponding request down to device driver.
bios with different operation types must not be merged.
+static enum bio_merge_status bio_attempt_copy_offload_merge(struct request *req,
+ struct bio *bio)
+{
+ if (req->__data_len != bio->bi_iter.bi_size)
+ return BIO_MERGE_FAILED;
+
+ req->biotail->bi_next = bio;
+ req->biotail = bio;
+ req->nr_phys_segments++;
+ req->__data_len += bio->bi_iter.bi_size;
+
+ return BIO_MERGE_OK;
+}
This function appends a bio to a request. Hence, the name of this function is
wrong.
@@ -1085,6 +1124,8 @@ static enum bio_merge_status blk_attempt_bio_merge(struct request_queue *q,
break;
case ELEVATOR_DISCARD_MERGE:
return bio_attempt_discard_merge(q, rq, bio);
+ case ELEVATOR_COPY_OFFLOAD_MERGE:
+ return bio_attempt_copy_offload_merge(rq, bio);
default:
return BIO_MERGE_NONE;
}
Is any code added in this patch series that causes an I/O scheduler to return
ELEVATOR_COPY_OFFLOAD_MERGE?
+static inline bool blk_copy_offload_mergable(struct request *req,
+ struct bio *bio)
+{
+ return (req_op(req) == REQ_OP_COPY_DST &&
+ bio_op(bio) == REQ_OP_COPY_SRC);
+}
bios with different operation types must not be merged. Please rename this function.
+static inline bool op_is_copy(blk_opf_t op)
+{
+ return ((op & REQ_OP_MASK) == REQ_OP_COPY_SRC ||
+ (op & REQ_OP_MASK) == REQ_OP_COPY_DST);
+}
The above function is not used in this patch. Please introduce new functions in the
patch in which these are used for the first time.
Thanks,
Bart.
