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doc/kernel/linear.txt
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Alasdair G Kergon
docs: Refresh kernel target docs
12 июл 2017, 20:59
12 июл 2017, 20:59
c2de4b9
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dm-linear ========= Device-Mapper's "linear" target maps a linear range of the Device-Mapper device onto a linear range of another device. This is the basic building block of logical volume managers. Parameters: <dev path> <offset> <dev path>: Full pathname to the underlying block-device, or a "major:minor" device-number. <offset>: Starting sector within the device. Example scripts =============== [[ #!/bin/sh # Create an identity mapping for a device echo "0 `blockdev --getsz $1` linear $1 0" | dmsetup create identity ]] [[ #!/bin/sh # Join 2 devices together size1=`blockdev --getsz $1` size2=`blockdev --getsz $2` echo "0 $size1 linear $1 0 $size1 $size2 linear $2 0" | dmsetup create joined ]] [[ #!/usr/bin/perl -w # Split a device into 4M chunks and then join them together in reverse order. my $name = "reverse"; my $extent_size = 4 * 1024 * 2; my $dev = $ARGV[0]; my $table = ""; my $count = 0; if (!defined($dev)) { die("Please specify a device.\n"); } my $dev_size = `blockdev --getsz $dev`; my $extents = int($dev_size / $extent_size) - (($dev_size % $extent_size) ? 1 : 0); while ($extents > 0) { my $this_start = $count * $extent_size; $extents--; $count++; my $this_offset = $extents * $extent_size; $table .= "$this_start $extent_size linear $dev $this_offset\n"; } `echo \"$table\" | dmsetup create $name`; ]]