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authorJan Kara <jack@suse.cz>2017-02-02 17:56:51 +0300
committerJens Axboe <axboe@fb.com>2017-02-02 18:20:50 +0300
commitd03f6cdc1fc422accb734c7c07a661a0018d8631 (patch)
treefe3500795df51b8ad11a0f76dddfa27d60fecf13 /include/linux/backing-dev.h
parentdc3b17cc8bf21307c7e076e7c778d5db756f7871 (diff)
downloadlinux-d03f6cdc1fc422accb734c7c07a661a0018d8631.tar.xz
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.h10
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);