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authorMinwoo Im <minwoo.im.dev@gmail.com>2017-11-07 09:25:37 -0700
committerJens Axboe <axboe@kernel.dk>2017-11-07 09:25:37 -0700
commitbf9fc98b736b8a3837040d5ce3a7caf04fa0859c (patch)
tree5ae41ac9c55b76ce9419af2183c56b11ec117b96 /Documentation/block
parente8815241173ebba4ccad490d4907b354b795fa5c (diff)
null_blk: add an usage for shared tags in documentation
Add usage explanation for a shared_tags, introduced by commit: 82f402fefa50 ("null_blk: add support for shared tags") Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com> Reworded slightly. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/block')
-rw-r--r--Documentation/block/null_blk.txt5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt
index fcf7f8487d8e..733927a7b501 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. Only makes sense with
+ nr_devices > 1, otherwise there's no tag set to share.