blk-mq: factor out a helper to iterate all tags for a request_queue

And replace the blk_mq_tag_busy_iter with it - the driver use has been
replaced with a new helper a while ago, and internal to the block we
only need the new version.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 9115c6d59948addbc445a26ad0f9ccaf4237b137..ed96474d75cb62fb261526736727c67ea2238d46 100644 (file)
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -471,17 +471,30 @@ void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
 }
 EXPORT_SYMBOL(blk_mq_all_tag_busy_iter);
 
-void blk_mq_tag_busy_iter(struct blk_mq_hw_ctx *hctx, busy_iter_fn *fn,
+void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
                void *priv)
 {
-       struct blk_mq_tags *tags = hctx->tags;
+       struct blk_mq_hw_ctx *hctx;
+       int i;
+
+
+       queue_for_each_hw_ctx(q, hctx, i) {
+               struct blk_mq_tags *tags = hctx->tags;
+
+               /*
+                * If not software queues are currently mapped to this
+                * hardware queue, there's nothing to check
+                */
+               if (!blk_mq_hw_queue_mapped(hctx))
+                       continue;
+
+               if (tags->nr_reserved_tags)
+                       bt_for_each(hctx, &tags->breserved_tags, 0, fn, priv, true);
+               bt_for_each(hctx, &tags->bitmap_tags, tags->nr_reserved_tags, fn, priv,
+                     false);
+       }
 
-       if (tags->nr_reserved_tags)
-               bt_for_each(hctx, &tags->breserved_tags, 0, fn, priv, true);
-       bt_for_each(hctx, &tags->bitmap_tags, tags->nr_reserved_tags, fn, priv,
-                       false);
 }
-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 9eb2cf4f01cb874706d64af87a01e94e0121f7e4..d468a79f2c4a2c11a00387816bcc03b64aea09d1 100644 (file)
--- a/block/blk-mq-tag.h
+++ b/block/blk-mq-tag.h
@@ -58,6 +58,8 @@ 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);
 extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
+void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
+               void *priv);
 
 enum {
        BLK_MQ_TAG_CACHE_MIN    = 1,

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 2306330530e8db9ae97d45c1ef7ac18cf7e4ec83..7785ae96267a197926c700f74bcd6524892a8c01 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -641,24 +641,16 @@ static void blk_mq_rq_timer(unsigned long priv)
                .next           = 0,
                .next_set       = 0,
        };
-       struct blk_mq_hw_ctx *hctx;
        int i;
 
-       queue_for_each_hw_ctx(q, hctx, i) {
-               /*
-                * If not software queues are currently mapped to this
-                * hardware queue, there's nothing to check
-                */
-               if (!blk_mq_hw_queue_mapped(hctx))
-                       continue;
-
-               blk_mq_tag_busy_iter(hctx, blk_mq_check_expired, &data);
-       }
+       blk_mq_queue_tag_busy_iter(q, blk_mq_check_expired, &data);
 
        if (data.next_set) {
                data.next = blk_rq_timeout(round_jiffies_up(data.next));
                mod_timer(&q->timeout, data.next);
        } else {
+               struct blk_mq_hw_ctx *hctx;
+
                queue_for_each_hw_ctx(q, hctx, i) {
                        /* the hctx may be unmapped, so check it here */
                        if (blk_mq_hw_queue_mapped(hctx))

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index c1b5c867ff071efad1d2167913689c78017955b6..5e7d43ab61c000d894164e093132f607344e9cc0 100644 (file)
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -223,8 +223,6 @@ 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_run_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_hw_ctx *hctx, busy_iter_fn *fn,
-               void *priv);
 void blk_mq_all_tag_busy_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
                void *priv);
 void blk_mq_freeze_queue(struct request_queue *q);