From: Sam Bradshaw <sbradshaw@micron.com>
Date: Fri, 23 May 2014 19:30:16 +0000 (-0600)
Subject: blk-mq: export blk_mq_tag_busy_iter
X-Git-Tag: next-20140530~59^2~18^2
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=edf866b3805c5651bf7d035b72dc0190cb6ff4a7;p=karo-tx-linux.git

blk-mq: export blk_mq_tag_busy_iter

Export the blk-mq in-flight tag iterator for driver consumption.
This is particularly useful in exception paths or SRSI where
in-flight IOs need to be cancelled and/or reissued. The NVMe driver
conversion will use this.

Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>
---

diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index f6dea968b710..05e2baf4fa0d 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -400,6 +400,7 @@ void blk_mq_tag_busy_iter(struct blk_mq_tags *tags,
 	fn(data, tag_map);
 	kfree(tag_map);
 }
+EXPORT_SYMBOL(blk_mq_tag_busy_iter);
 
 static unsigned int bt_unused_tags(struct blk_mq_bitmap_tags *bt)
 {
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
index e7ff5ceeeb97..2e5e6872d089 100644
--- a/block/blk-mq-tag.h
+++ b/block/blk-mq-tag.h
@@ -51,7 +51,6 @@ extern void blk_mq_free_tags(struct blk_mq_tags *tags);
 extern unsigned int blk_mq_get_tag(struct blk_mq_hw_ctx *hctx, unsigned int *last_tag, gfp_t gfp, bool reserved);
 extern void blk_mq_wait_for_tags(struct blk_mq_hw_ctx *hctx, bool reserved);
 extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag);
-extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
 extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
 extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
 extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 4d2800567aad..f76bb18350af 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -181,6 +181,7 @@ void blk_mq_stop_hw_queues(struct request_queue *q);
 void blk_mq_start_hw_queues(struct request_queue *q);
 void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
 void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
+void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
 
 /*
  * Driver command data is immediately after the request. So subtract request