loop: remove cmd->rq member

We can always get at the request from the payload, no need to store
a pointer to it.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index c9d0449..8b2fde2 100644 (file)
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -452,9 +452,9 @@ static void lo_complete_rq(struct request *rq)
 {
        struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);
 
-       if (unlikely(req_op(cmd->rq) == REQ_OP_READ && cmd->use_aio &&
-                    cmd->ret >= 0 && cmd->ret < blk_rq_bytes(cmd->rq))) {
-               struct bio *bio = cmd->rq->bio;
+       if (unlikely(req_op(rq) == REQ_OP_READ && cmd->use_aio &&
+                    cmd->ret >= 0 && cmd->ret < blk_rq_bytes(rq))) {
+               struct bio *bio = rq->bio;
 
                bio_advance(bio, cmd->ret);
                zero_fill_bio(bio);
@@ -465,11 +465,13 @@ static void lo_complete_rq(struct request *rq)
 
 static void lo_rw_aio_do_completion(struct loop_cmd *cmd)
 {
+       struct request *rq = blk_mq_rq_from_pdu(cmd);
+
        if (!atomic_dec_and_test(&cmd->ref))
                return;
        kfree(cmd->bvec);
        cmd->bvec = NULL;
-       blk_mq_complete_request(cmd->rq);
+       blk_mq_complete_request(rq);
 }
 
 static void lo_rw_aio_complete(struct kiocb *iocb, long ret, long ret2)
@@ -487,7 +489,7 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
 {
        struct iov_iter iter;
        struct bio_vec *bvec;
-       struct request *rq = cmd->rq;
+       struct request *rq = blk_mq_rq_from_pdu(cmd);
        struct bio *bio = rq->bio;
        struct file *file = lo->lo_backing_file;
        unsigned int offset;
@@ -1702,15 +1704,16 @@ EXPORT_SYMBOL(loop_unregister_transfer);
 static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
                const struct blk_mq_queue_data *bd)
 {
-       struct loop_cmd *cmd = blk_mq_rq_to_pdu(bd->rq);
-       struct loop_device *lo = cmd->rq->q->queuedata;
+       struct request *rq = bd->rq;
+       struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);
+       struct loop_device *lo = rq->q->queuedata;
 
-       blk_mq_start_request(bd->rq);
+       blk_mq_start_request(rq);
 
        if (lo->lo_state != Lo_bound)
                return BLK_STS_IOERR;
 
-       switch (req_op(cmd->rq)) {
+       switch (req_op(rq)) {
        case REQ_OP_FLUSH:
        case REQ_OP_DISCARD:
        case REQ_OP_WRITE_ZEROES:
@@ -1723,8 +1726,8 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
 
        /* always use the first bio's css */
 #ifdef CONFIG_BLK_CGROUP
-       if (cmd->use_aio && cmd->rq->bio && cmd->rq->bio->bi_css) {
-               cmd->css = cmd->rq->bio->bi_css;
+       if (cmd->use_aio && rq->bio && rq->bio->bi_css) {
+               cmd->css = rq->bio->bi_css;
                css_get(cmd->css);
        } else
 #endif
@@ -1736,8 +1739,9 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx,
 
 static void loop_handle_cmd(struct loop_cmd *cmd)
 {
-       const bool write = op_is_write(req_op(cmd->rq));
-       struct loop_device *lo = cmd->rq->q->queuedata;
+       struct request *rq = blk_mq_rq_from_pdu(cmd);
+       const bool write = op_is_write(req_op(rq));
+       struct loop_device *lo = rq->q->queuedata;
        int ret = 0;
 
        if (write && (lo->lo_flags & LO_FLAGS_READ_ONLY)) {
@@ -1745,12 +1749,12 @@ static void loop_handle_cmd(struct loop_cmd *cmd)
                goto failed;
        }
 
-       ret = do_req_filebacked(lo, cmd->rq);
+       ret = do_req_filebacked(lo, rq);
  failed:
        /* complete non-aio request */
        if (!cmd->use_aio || ret) {
                cmd->ret = ret ? -EIO : 0;
-               blk_mq_complete_request(cmd->rq);
+               blk_mq_complete_request(rq);
        }
 }
 
@@ -1767,9 +1771,7 @@ static int loop_init_request(struct blk_mq_tag_set *set, struct request *rq,
 {
        struct loop_cmd *cmd = blk_mq_rq_to_pdu(rq);
 
-       cmd->rq = rq;
        kthread_init_work(&cmd->work, loop_queue_work);
-
        return 0;
 }
 

diff --git a/drivers/block/loop.h b/drivers/block/loop.h
index 0f45416..b78de98 100644 (file)
--- a/drivers/block/loop.h
+++ b/drivers/block/loop.h
@@ -66,7 +66,6 @@ struct loop_device {
 
 struct loop_cmd {
        struct kthread_work work;
-       struct request *rq;
        bool use_aio; /* use AIO interface to handle I/O */
        atomic_t ref; /* only for aio */
        long ret;