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block: Dynamically allocate and refcount backing_dev_info

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Instead of storing backing_dev_info inside struct request_queue,
allocate it dynamically, reference count it, and free it when the last
reference is dropped. Currently only request_queue holds the reference
but in the following patch we add other users referencing
backing_dev_info.

Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Jan Kara 2017-02-02 15:56:51 +01:00 • committed by Jens Axboe
parent dc3b17cc8b
commit d03f6cdc1f
6 changed files with 50 additions and 11 deletions
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10
include/linux/backing-dev.h
View file

@ -18,7 +18,14 @@
#include <linux/slab.h>
int __must_check bdi_init(struct backing_dev_info *bdi);
void bdi_exit(struct backing_dev_info *bdi);
static inline struct backing_dev_info *bdi_get(struct backing_dev_info *bdi)
{
kref_get(&bdi->refcnt);
return bdi;
}
void bdi_put(struct backing_dev_info *bdi);
__printf(3, 4)
int bdi_register(struct backing_dev_info *bdi, struct device *parent,
@ -29,6 +36,7 @@ void bdi_unregister(struct backing_dev_info *bdi);
int __must_check bdi_setup_and_register(struct backing_dev_info *, char *);
void bdi_destroy(struct backing_dev_info *bdi);
struct backing_dev_info *bdi_alloc_node(gfp_t gfp_mask, int node_id);
void wb_start_writeback(struct bdi_writeback *wb, long nr_pages,
bool range_cyclic, enum wb_reason reason);