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Diffstat (limited to 'Documentation/device-mapper/linear.txt')
-rw-r--r-- | Documentation/device-mapper/linear.txt | 61 |
1 files changed, 0 insertions, 61 deletions
diff --git a/Documentation/device-mapper/linear.txt b/Documentation/device-mapper/linear.txt deleted file mode 100644 index 7cb98d89d3f8..000000000000 --- a/Documentation/device-mapper/linear.txt +++ /dev/null @@ -1,61 +0,0 @@ -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`; -]] |