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>
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@ -71,13 +71,16 @@ use_per_node_hctx=[0/1]: Default: 0
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1: The multi-queue block layer is instantiated with a hardware dispatch
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queue for each CPU node in the system.
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use_lightnvm=[0/1]: Default: 0
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Register device with LightNVM. Requires blk-mq and CONFIG_NVM to be enabled.
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no_sched=[0/1]: Default: 0
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0: nullb* use default blk-mq io scheduler.
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1: nullb* doesn't use io scheduler.
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blocking=[0/1]: Default: 0
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0: Register as a non-blocking blk-mq driver device.
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1: Register as a blocking blk-mq driver device, null_blk will set
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the BLK_MQ_F_BLOCKING flag, indicating that it sometimes/always
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needs to block in its ->queue_rq() function.
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shared_tags=[0/1]: Default: 0
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0: Tag set is not shared.
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1: Tag set shared between devices for blk-mq. Only makes sense with
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