add usage explanation for a shared_tags of
commit 82f402fefa50f1675bf918bcd009981bd6b30ac8
("null_blk: add support for shared tags") to this documentation.
Signed-off-by: Minwoo Im <minwoo.im.dev@xxxxxxxxx>
---
Documentation/block/null_blk.txt | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt
index b7161c8..e1d1aa9 100644
--- a/Documentation/block/null_blk.txt
+++ b/Documentation/block/null_blk.txt
@@ -77,3 +77,8 @@ use_lightnvm=[0/1]: Default: 0
no_sched=[0/1]: Default: 0
0: nullb* use default blk-mq io scheduler.
1: nullb* doesn't use io scheduler.
+
+shared_tags=[0/1]: Default: 0
+ 0: Tag set is not shared.
+ 1: Tag set shared between devices for blk-mq.
+ Requires nr_devices to be bigger than 1.
--
2.7.4
