Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) ========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) dm-delay
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) ========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) Device-Mapper's "delay" target delays reads and/or writes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) and maps them to different devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) Parameters::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)     <device> <offset> <delay> [<write_device> <write_offset> <write_delay>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 			       [<flush_device> <flush_offset> <flush_delay>]]
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) With separate write parameters, the first set is only used for reads.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) Offsets are specified in sectors.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) Delays are specified in milliseconds.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) Example scripts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) ===============
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) ::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	#!/bin/sh
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 	# Create device delaying rw operation for 500ms
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	echo "0 `blockdev --getsz $1` delay $1 0 500" | dmsetup create delayed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) ::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 	#!/bin/sh
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	# Create device delaying only write operation for 500ms and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	# splitting reads and writes to different devices $1 $2
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	echo "0 `blockdev --getsz $1` delay $1 0 0 $2 0 500" | dmsetup create delayed