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H A D | scsi_debug.c | 7109f370 Sat Jan 08 19:28:50 CST 2022 Douglas Gilbert <dgilbert@interlog.com> scsi: scsi_debug: Add no_rwlock parameter
By default, this driver places a read lock around all user data fetches and a write lock around all user data modifying operations (e.g. WRITE commands). These locks have "per store" granularity. Other drivers that have a similar function (e.g. null_blk) do not take this data integrity step and run significantly faster in some tests.
In the common case of a (simulated) device to device copy (e.g. what dd and its variants do) there should be no need for locks around data accesses. So add the driver and sysfs parameter no_rwlock which is boolean and when set does what its name suggests. The default is false for backward comaptibility.
Link: https://lore.kernel.org/r/20220109012853.301953-7-dgilbert@interlog.com Signed-off-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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