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authorLiu Bo <bo.liu@linux.alibaba.com>2018-05-25 22:40:04 +0800
committerJens Axboe <axboe@kernel.dk>2018-05-25 08:51:58 -0600
commit6723d8dc9d3b07dcd9d8ac501be15bfe1319b650 (patch)
tree8651953cfb1778c254934cceefd98a0bce244316 /Documentation/block/null_blk.txt
parent5657a819a8d94426c76be04dcedfad0f64cfff00 (diff)
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>
Diffstat (limited to 'Documentation/block/null_blk.txt')
-rw-r--r--Documentation/block/null_blk.txt9
1 files changed, 6 insertions, 3 deletions
diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt
index 733927a7b501..07f147381f32 100644
--- a/Documentation/block/null_blk.txt
+++ b/Documentation/block/null_blk.txt
@@ -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