blk-mq: Some tag allocation code refactoring
The tag allocation code to alloc the sbitmap pairs is common for regular
bitmaps tags and shared sbitmap, so refactor into a common function.
Also remove superfluous "flags" argument from blk_mq_init_shared_sbitmap().
Signed-off-by: John Garry <john.garry@huawei.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/1620907258-30910-2-git-send-email-john.garry@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 1671dae..f597d40 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -471,39 +471,54 @@ static int bt_alloc(struct sbitmap_queue *bt, unsigned int depth,
node);
}
+int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
+ struct sbitmap_queue *breserved_tags,
+ unsigned int queue_depth, unsigned int reserved,
+ int node, int alloc_policy)
+{
+ unsigned int depth = queue_depth - reserved;
+ bool round_robin = alloc_policy == BLK_TAG_ALLOC_RR;
+
+ if (bt_alloc(bitmap_tags, depth, round_robin, node))
+ return -ENOMEM;
+ if (bt_alloc(breserved_tags, reserved, round_robin, node))
+ goto free_bitmap_tags;
+
+ return 0;
+
+free_bitmap_tags:
+ sbitmap_queue_free(bitmap_tags);
+ return -ENOMEM;
+}
+
static int blk_mq_init_bitmap_tags(struct blk_mq_tags *tags,
int node, int alloc_policy)
{
- unsigned int depth = tags->nr_tags - tags->nr_reserved_tags;
- bool round_robin = alloc_policy == BLK_TAG_ALLOC_RR;
+ int ret;
- if (bt_alloc(&tags->__bitmap_tags, depth, round_robin, node))
- return -ENOMEM;
- if (bt_alloc(&tags->__breserved_tags, tags->nr_reserved_tags,
- round_robin, node))
- goto free_bitmap_tags;
+ ret = blk_mq_init_bitmaps(&tags->__bitmap_tags,
+ &tags->__breserved_tags,
+ tags->nr_tags, tags->nr_reserved_tags,
+ node, alloc_policy);
+ if (ret)
+ return ret;
tags->bitmap_tags = &tags->__bitmap_tags;
tags->breserved_tags = &tags->__breserved_tags;
return 0;
-free_bitmap_tags:
- sbitmap_queue_free(&tags->__bitmap_tags);
- return -ENOMEM;
}
-int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set, unsigned int flags)
+int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set)
{
- unsigned int depth = set->queue_depth - set->reserved_tags;
int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(set->flags);
- bool round_robin = alloc_policy == BLK_TAG_ALLOC_RR;
- int i, node = set->numa_node;
+ int i, ret;
- if (bt_alloc(&set->__bitmap_tags, depth, round_robin, node))
- return -ENOMEM;
- if (bt_alloc(&set->__breserved_tags, set->reserved_tags,
- round_robin, node))
- goto free_bitmap_tags;
+ ret = blk_mq_init_bitmaps(&set->__bitmap_tags, &set->__breserved_tags,
+ set->queue_depth, set->reserved_tags,
+ set->numa_node, alloc_policy);
+ if (ret)
+ return ret;
for (i = 0; i < set->nr_hw_queues; i++) {
struct blk_mq_tags *tags = set->tags[i];
@@ -513,9 +528,6 @@ int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set, unsigned int flags)
}
return 0;
-free_bitmap_tags:
- sbitmap_queue_free(&set->__bitmap_tags);
- return -ENOMEM;
}
void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set)
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
index f887988..8ed55af 100644
--- a/block/blk-mq-tag.h
+++ b/block/blk-mq-tag.h
@@ -32,11 +32,14 @@ extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
unsigned int reserved_tags,
int node, unsigned int flags);
extern void blk_mq_free_tags(struct blk_mq_tags *tags, unsigned int flags);
+extern int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
+ struct sbitmap_queue *breserved_tags,
+ unsigned int queue_depth,
+ unsigned int reserved,
+ int node, int alloc_policy);
-extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set,
- unsigned int flags);
+extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set);
extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);
-
extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
unsigned int tag);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index fbb1653..001e196 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -3564,7 +3564,7 @@ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set)
if (blk_mq_is_sbitmap_shared(set->flags)) {
atomic_set(&set->active_queues_shared_sbitmap, 0);
- if (blk_mq_init_shared_sbitmap(set, set->flags)) {
+ if (blk_mq_init_shared_sbitmap(set)) {
ret = -ENOMEM;
goto out_free_mq_rq_maps;
}