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null_blk: add an usage for shared tags in documentation

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Add usage explanation for a shared_tags, introduced by commit:

82f402fefa ("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>
This commit is contained in:
Minwoo Im 2017-11-07 09:25:37 -07:00 committed by Jens Axboe
parent e881524117
commit bf9fc98b73
1 changed files with 5 additions and 0 deletions
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Documentation/block/null_blk.txt
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@ -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.