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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /Documentation/admin-guide/device-mapper/linear.rst | |
parent | Initial commit. (diff) | |
download | linux-upstream/5.10.209.tar.xz linux-upstream/5.10.209.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | Documentation/admin-guide/device-mapper/linear.rst | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/Documentation/admin-guide/device-mapper/linear.rst b/Documentation/admin-guide/device-mapper/linear.rst new file mode 100644 index 000000000..9d17fc6e6 --- /dev/null +++ b/Documentation/admin-guide/device-mapper/linear.rst @@ -0,0 +1,63 @@ +========= +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`; |