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Subject[PATCH 3/6] blk-mq: register device instead of disk
Date
Enable devices without a gendisk instance to register itself with blk-mq
and expose the associated multi-queue sysfs entries.

Signed-off-by: Matias Bjørling <m@bjorling.me>
---
block/blk-mq-sysfs.c | 13 +++++--------
block/blk-sysfs.c | 4 ++--
drivers/md/dm.c | 2 +-
include/linux/blk-mq.h | 4 ++--
4 files changed, 10 insertions(+), 13 deletions(-)

diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index 4ea4dd8..f67b5c1 100644
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -380,9 +380,8 @@ static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
return ret;
}

-void blk_mq_unregister_disk(struct gendisk *disk)
+void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
{
- struct request_queue *q = disk->queue;
struct blk_mq_hw_ctx *hctx;
struct blk_mq_ctx *ctx;
int i, j;
@@ -402,7 +401,7 @@ void blk_mq_unregister_disk(struct gendisk *disk)
kobject_del(&q->mq_kobj);
kobject_put(&q->mq_kobj);

- kobject_put(&disk_to_dev(disk)->kobj);
+ kobject_put(&dev->kobj);

q->mq_sysfs_init_done = false;
blk_mq_enable_hotplug();
@@ -426,10 +425,8 @@ static void blk_mq_sysfs_init(struct request_queue *q)
}
}

-int blk_mq_register_disk(struct gendisk *disk)
+int blk_mq_register_dev(struct device *dev, struct request_queue *q)
{
- struct device *dev = disk_to_dev(disk);
- struct request_queue *q = disk->queue;
struct blk_mq_hw_ctx *hctx;
int ret, i;

@@ -450,7 +447,7 @@ int blk_mq_register_disk(struct gendisk *disk)
}

if (ret)
- blk_mq_unregister_disk(disk);
+ blk_mq_unregister_dev(dev, q);
else
q->mq_sysfs_init_done = true;
out:
@@ -458,7 +455,7 @@ out:

return ret;
}
-EXPORT_SYMBOL_GPL(blk_mq_register_disk);
+EXPORT_SYMBOL_GPL(blk_mq_register_dev);

void blk_mq_sysfs_unregister(struct request_queue *q)
{
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 9920596..5223c5f 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -693,7 +693,7 @@ int blk_register_queue(struct gendisk *disk)
kobject_uevent(&q->kobj, KOBJ_ADD);

if (q->mq_ops)
- blk_mq_register_disk(disk);
+ blk_mq_register_dev(disk_to_dev(disk), q);

if (!q->request_fn)
return 0;
@@ -718,7 +718,7 @@ void blk_unregister_queue(struct gendisk *disk)
return;

if (q->mq_ops)
- blk_mq_unregister_disk(disk);
+ blk_mq_unregister_dev(disk_to_dev(disk), q);

if (q->request_fn)
elv_unregister_queue(q);
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index aba7ed9..9de3a9c 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2798,7 +2798,7 @@ static int dm_mq_init_request_queue(struct mapped_device *md,
dm_init_md_queue(md);

/* backfill 'mq' sysfs registration normally done in blk_register_queue */
- blk_mq_register_disk(md->disk);
+ blk_mq_register_dev(disk_to_dev(md->disk), q);

return 0;

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 2498fdf..ab6fb32 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -176,8 +176,8 @@ enum {
struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
struct request_queue *q);
-int blk_mq_register_disk(struct gendisk *);
-void blk_mq_unregister_disk(struct gendisk *);
+int blk_mq_register_dev(struct device *, struct request_queue *);
+void blk_mq_unregister_dev(struct device *, struct request_queue *);

int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
--
2.1.4
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