From 1c357a1e86a4227a6b6059f2de118ae47659cebc Mon Sep 17 00:00:00 2001 From: Mike Snitzer Date: Sat, 6 Feb 2016 17:01:17 -0500 Subject: [PATCH] dm: allocate blk_mq_tag_set rather than embed in mapped_device The blk_mq_tag_set is only needed for dm-mq support. There is point wasting space in 'struct mapped_device' for non-dm-mq devices. Signed-off-by: Mike Snitzer Signed-off-by: Dan Carpenter # check kzalloc return --- drivers/md/dm.c | 45 +++++++++++++++++++++++++++------------------ 1 file changed, 27 insertions(+), 18 deletions(-) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index d17be1efb4d8..e9035959f904 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -223,7 +223,7 @@ struct mapped_device { ktime_t last_rq_start_time; /* for blk-mq request-based DM support */ - struct blk_mq_tag_set tag_set; + struct blk_mq_tag_set *tag_set; bool use_blk_mq; }; @@ -2388,8 +2388,10 @@ static void free_dev(struct mapped_device *md) unlock_fs(md); cleanup_mapped_device(md); - if (md->use_blk_mq) - blk_mq_free_tag_set(&md->tag_set); + if (md->tag_set) { + blk_mq_free_tag_set(md->tag_set); + kfree(md->tag_set); + } free_table_devices(&md->table_devices); dm_stats_cleanup(&md->stats); @@ -2710,24 +2712,28 @@ static int dm_init_request_based_blk_mq_queue(struct mapped_device *md) struct request_queue *q; int err; - memset(&md->tag_set, 0, sizeof(md->tag_set)); - md->tag_set.ops = &dm_mq_ops; - md->tag_set.queue_depth = dm_get_blk_mq_queue_depth(); - md->tag_set.numa_node = NUMA_NO_NODE; - md->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; - md->tag_set.nr_hw_queues = dm_get_blk_mq_nr_hw_queues(); + md->tag_set = kzalloc(sizeof(struct blk_mq_tag_set), GFP_KERNEL); + if (!md->tag_set) + return -ENOMEM; + + md->tag_set->ops = &dm_mq_ops; + md->tag_set->queue_depth = dm_get_blk_mq_queue_depth(); + md->tag_set->numa_node = NUMA_NO_NODE; + md->tag_set->flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE; + md->tag_set->nr_hw_queues = dm_get_blk_mq_nr_hw_queues(); + md->tag_set->driver_data = md; + + md->tag_set->cmd_size = sizeof(struct dm_rq_target_io); if (md_type == DM_TYPE_REQUEST_BASED) { - /* make the memory for non-blk-mq clone part of the pdu */ - md->tag_set.cmd_size = sizeof(struct dm_rq_target_io) + sizeof(struct request); - } else - md->tag_set.cmd_size = sizeof(struct dm_rq_target_io); - md->tag_set.driver_data = md; + /* put the memory for non-blk-mq clone at the end of the pdu */ + md->tag_set->cmd_size += sizeof(struct request); + } - err = blk_mq_alloc_tag_set(&md->tag_set); + err = blk_mq_alloc_tag_set(md->tag_set); if (err) - return err; + goto out_kfree_tag_set; - q = blk_mq_init_allocated_queue(&md->tag_set, md->queue); + q = blk_mq_init_allocated_queue(md->tag_set, md->queue); if (IS_ERR(q)) { err = PTR_ERR(q); goto out_tag_set; @@ -2744,7 +2750,10 @@ static int dm_init_request_based_blk_mq_queue(struct mapped_device *md) return 0; out_tag_set: - blk_mq_free_tag_set(&md->tag_set); + blk_mq_free_tag_set(md->tag_set); +out_kfree_tag_set: + kfree(md->tag_set); + return err; } -- 2.20.1