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null_blk: add blocking description and remove lightnvm 

- The description of 'blocking' is missing in null_blk.txt

- The 'lightnvm' parameter has been removed in null_blk.c

This updates both in null_blk.txt.

Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Liu Bo 2018-05-25 22:40:04 +08:00 committed by Jens Axboe
parent 5657a819a8
commit 6723d8dc9d
1 changed files with 6 additions and 3 deletions
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9
Documentation/block/null_blk.txt
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@ -71,13 +71,16 @@ use_per_node_hctx=[0/1]: Default: 0
1: The multi-queue block layer is instantiated with a hardware dispatch
queue for each CPU node in the system.
use_lightnvm=[0/1]: Default: 0
Register device with LightNVM. Requires blk-mq and CONFIG_NVM to be enabled.
no_sched=[0/1]: Default: 0
0: nullb* use default blk-mq io scheduler.
1: nullb* doesn't use io scheduler.
blocking=[0/1]: Default: 0
0: Register as a non-blocking blk-mq driver device.
1: Register as a blocking blk-mq driver device, null_blk will set
the BLK_MQ_F_BLOCKING flag, indicating that it sometimes/always
needs to block in its ->queue_rq() function.
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