@@ -823,8 +823,10 @@ static void blk_complete_request(struct request *req)
* can find how many bytes remain in the request
* later.
*/
- req->bio = NULL;
- req->__data_len = 0;
+ if (!req->end_io) {
+ req->bio = NULL;
+ req->__data_len = 0;
+ };
}
/**
@@ -1055,6 +1057,13 @@ void blk_mq_end_request_batch(struct io_comp_batch *iob)
rq_qos_done(rq->q, rq);
+ /*
+ * If end_io handler returns NONE, then it still has
+ * ownership of the request.
+ */
+ if (rq->end_io && rq->end_io(rq, 0) == RQ_END_IO_NONE)
+ continue;
+
WRITE_ONCE(rq->state, MQ_RQ_IDLE);
if (!req_ref_put_and_test(rq))
continue;
@@ -853,8 +853,9 @@ static inline bool blk_mq_add_to_batch(struct request *req,
struct io_comp_batch *iob, int ioerror,
void (*complete)(struct io_comp_batch *))
{
- if (!iob || (req->rq_flags & RQF_ELV) || req->end_io || ioerror)
+ if (!iob || (req->rq_flags & RQF_ELV) || ioerror)
return false;
+
if (!iob->complete)
iob->complete = complete;
else if (iob->complete != complete)
With end_io handlers now being able to potentially pass ownership of the request upon completion, we can allow requests with end_io handlers in the batch completion handling. Co-developed-by: Stefan Roesch <shr@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> --- block/blk-mq.c | 13 +++++++++++-- include/linux/blk-mq.h | 3 ++- 2 files changed, 13 insertions(+), 3 deletions(-)