[PATCH 5/6] pd: replace ->special use with private data in the request

[Christoph Hellwig]

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 drivers/block/paride/pd.c | 30 +++++++++++++++++++++++++-----
 1 file changed, 25 insertions(+), 5 deletions(-)

diff --git a/drivers/block/paride/pd.c b/drivers/block/paride/pd.c
index ae4971e5d9a8..0ff9b12d0e35 100644
--- a/drivers/block/paride/pd.c
+++ b/drivers/block/paride/pd.c
@@ -242,6 +242,11 @@ struct pd_unit {
 
 static struct pd_unit pd[PD_UNITS];
 
+struct pd_req {
+       /* for REQ_OP_DRV_IN: */
+       enum action (*func)(struct pd_unit *disk);
+};
+
 static char pd_scratch[512];   /* scratch block buffer */
 
 static char *pd_errs[17] = { "ERR", "INDEX", "ECC", "DRQ", "SEEK", "WRERR",
@@ -502,8 +507,9 @@ static enum action do_pd_io_start(void)
 
 static enum action pd_special(void)
 {
-       enum action (*func)(struct pd_unit *) = pd_req->special;
-       return func(pd_current);
+       struct pd_req *req = blk_mq_rq_to_pdu(pd_req);
+
+       return req->func(pd_current);
 }
 
 static int pd_next_buf(void)
@@ -767,12 +773,14 @@ static int pd_special_command(struct pd_unit *disk,
                      enum action (*func)(struct pd_unit *disk))
 {
        struct request *rq;
+       struct pd_req *req;
 
        rq = blk_get_request(disk->gd->queue, REQ_OP_DRV_IN, 0);
        if (IS_ERR(rq))
                return PTR_ERR(rq);
+       req = blk_mq_rq_to_pdu(rq);
 
-       rq->special = func;
+       req->func = func;
        blk_execute_rq(disk->gd->queue, disk->gd, rq, 0);
        blk_put_request(rq);
        return 0;
@@ -892,9 +900,21 @@ static void pd_probe_drive(struct pd_unit *disk)
        disk->gd = p;
        p->private_data = disk;
 
-       p->queue = blk_mq_init_sq_queue(&disk->tag_set, &pd_mq_ops, 2,
-                               BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING);
+       memset(&disk->tag_set, 0, sizeof(disk->tag_set));
+       disk->tag_set.ops = &pd_mq_ops;
+       disk->tag_set.cmd_size = sizeof(struct pd_req);
+       disk->tag_set.nr_hw_queues = 1;
+       disk->tag_set.nr_maps = 1;
+       disk->tag_set.queue_depth = 2;
+       disk->tag_set.numa_node = NUMA_NO_NODE;
+       disk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_BLOCKING;
+
+       if (blk_mq_alloc_tag_set(&disk->tag_set))
+               return;
+
+       p->queue = blk_mq_init_queue(&disk->tag_set);
        if (IS_ERR(p->queue)) {
+               blk_mq_free_tag_set(&disk->tag_set);
                p->queue = NULL;
                return;
        }
-- 
2.19.1