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block: untangle request_queue refcounting from sysfs

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The kobject embedded into the request_queue is used for the queue
directory in sysfs, but that is a child of the gendisks directory and is
intimately tied to it.  Move this kobject to the gendisk and use a
refcount_t in the request_queue for the actual request_queue refcounting
that is completely unrelated to the device model.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20221114042637.1009333-5-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig
2022-11-14 05:26:36 +01:00
committed by Jens Axboe
parent 40602997be
commit 2bd85221a6
8 changed files with 71 additions and 87 deletions
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6
include/linux/blkdev.h
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@@ -155,6 +155,7 @@ struct gendisk {
unsigned open_partitions; /* number of open partitions */
struct backing_dev_info *bdi;
struct kobject queue_kobj; /* the queue/ directory */
struct kobject *slave_dir;
#ifdef CONFIG_BLOCK_HOLDER_DEPRECATED
struct list_head slave_bdevs;
@@ -430,10 +431,7 @@ struct request_queue {
struct gendisk *disk;
/*
* queue kobject
*/
struct kobject kobj;
refcount_t refs;
/*
* mq queue kobject