Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) =========
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) dm-stripe
^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 "striped" target is used to create a striped (i.e. RAID-0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) device across one or more underlying devices. Data is written in "chunks",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) with consecutive chunks rotating among the underlying devices. This can
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) potentially provide improved I/O throughput by utilizing several physical
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) devices in parallel.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) Parameters: <num devs> <chunk size> [<dev path> <offset>]+
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)     <num devs>:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 	Number of underlying devices.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)     <chunk size>:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 	Size of each chunk of data. Must be at least as
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)         large as the system's PAGE_SIZE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)     <dev path>:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	Full pathname to the underlying block-device, or a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	"major:minor" device-number.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)     <offset>:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	Starting sector within the device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) One or more underlying devices can be specified. The striped device size must
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) be a multiple of the chunk size multiplied by the number of underlying devices.
^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) Example scripts
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) ===============
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) ::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)   #!/usr/bin/perl -w
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)   # Create a striped device across any number of underlying devices. The device
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)   # will be called "stripe_dev" and have a chunk-size of 128k.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)   my $chunk_size = 128 * 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)   my $dev_name = "stripe_dev";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)   my $num_devs = @ARGV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)   my @devs = @ARGV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)   my ($min_dev_size, $stripe_dev_size, $i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)   if (!$num_devs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)           die("Specify at least one device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)   }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)   $min_dev_size = `blockdev --getsz $devs[0]`;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47)   for ($i = 1; $i < $num_devs; $i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)           my $this_size = `blockdev --getsz $devs[$i]`;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)           $min_dev_size = ($min_dev_size < $this_size) ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50)                           $min_dev_size : $this_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)   }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53)   $stripe_dev_size = $min_dev_size * $num_devs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54)   $stripe_dev_size -= $stripe_dev_size % ($chunk_size * $num_devs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)   $table = "0 $stripe_dev_size striped $num_devs $chunk_size";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)   for ($i = 0; $i < $num_devs; $i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58)           $table .= " $devs[$i] 0";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59)   }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61)   `echo $table | dmsetup create $dev_name`;