diff options
| author |   Jan Kara <jack@suse.cz> | 2017-02-02 15:56:51 +0100 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2017-02-02 08:20:50 -0700 |
| commit | d03f6cdc1fc422accb734c7c07a661a0018d8631 (patch) | |
| tree | fe3500795df51b8ad11a0f76dddfa27d60fecf13 /include/linux/backing-dev.h | |
| parent | block: Use pointer to backing_dev_info from request_queue (diff) | |
| download | linux-dev-d03f6cdc1fc422accb734c7c07a661a0018d8631.tar.xz linux-dev-d03f6cdc1fc422accb734c7c07a661a0018d8631.zip | |
block: Dynamically allocate and refcount backing_dev_info
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>
Diffstat (limited to 'include/linux/backing-dev.h')
| -rw-r--r-- | include/linux/backing-dev.h | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 43b93a947e61..efb6ca992d05 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -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); |