blk-mq: abstract tag allocation out into sbitmap library
This is a generally useful data structure, so make it available to
anyone else who might want to use it. It's also a nice cleanup
separating the allocation logic from the rest of the tag handling logic.
The code is behind a new Kconfig option, CONFIG_SBITMAP, which is only
selected by CONFIG_BLOCK for now.
This should be a complete noop functionality-wise.
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 60ef14c..2575779 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -2,6 +2,7 @@
#define BLK_MQ_H
#include <linux/blkdev.h>
+#include <linux/sbitmap.h>
struct blk_mq_tags;
struct blk_flush_queue;
@@ -12,12 +13,6 @@
int (*notify)(void *data, unsigned long action, unsigned int cpu);
};
-struct blk_mq_ctxmap {
- unsigned int size;
- unsigned int bits_per_word;
- struct blk_align_bitmap *map;
-};
-
struct blk_mq_hw_ctx {
struct {
spinlock_t lock;
@@ -37,7 +32,7 @@
void *driver_data;
- struct blk_mq_ctxmap ctx_map;
+ struct sbitmap ctx_map;
struct blk_mq_ctx **ctxs;
unsigned int nr_ctx;