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authorOmar Sandoval <osandov@fb.com>2017-04-14 00:59:59 -0700
committerJens Axboe <axboe@fb.com>2017-04-14 14:06:54 -0600
commit229a92873f3afc20b0d91aaaec08cbc11689dd8b (patch)
tree399e4d8109e92ec0ea8069dd2d331328a2c2c284
parentc05e66733788118377c21a913c1bc7b64bccc167 (diff)
downloadlinux-229a92873f3afc20b0d91aaaec08cbc11689dd8b.tar.bz2
blk-mq: add shallow depth option for blk_mq_get_tag()
Wire up the sbitmap_get_shallow() operation to the tag code so that a caller can limit the number of tags available to it. Signed-off-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Jens Axboe <axboe@fb.com>
-rw-r--r--block/blk-mq-tag.c5
-rw-r--r--block/blk-mq.h1
2 files changed, 5 insertions, 1 deletions
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 9d97bfc4d465..d0be72ccb091 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -96,7 +96,10 @@ static int __blk_mq_get_tag(struct blk_mq_alloc_data *data,
if (!(data->flags & BLK_MQ_REQ_INTERNAL) &&
!hctx_may_queue(data->hctx, bt))
return -1;
- return __sbitmap_queue_get(bt);
+ if (data->shallow_depth)
+ return __sbitmap_queue_get_shallow(bt, data->shallow_depth);
+ else
+ return __sbitmap_queue_get(bt);
}
unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data)
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 7e6f2e467696..524f44742816 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -141,6 +141,7 @@ struct blk_mq_alloc_data {
/* input parameter */
struct request_queue *q;
unsigned int flags;
+ unsigned int shallow_depth;
/* input & output parameter */
struct blk_mq_ctx *ctx;