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authorMauro Carvalho Chehab <mchehab+samsung@kernel.org>2019-06-12 19:52:43 +0200
committerJonathan Corbet <corbet@lwn.net>2019-06-14 22:21:04 +0200
commitf0ba43774cea3fc14732bb9243ce7238ae8a3202 (patch)
tree5579b300bfc410ed14bb3112586cef02750d7eb0 /Documentation/device-mapper/delay.txt
parentdocs: cdrom: convert docs to ReST and rename to *.rst (diff)
downloadlinux-f0ba43774cea3fc14732bb9243ce7238ae8a3202.tar.xz
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docs: convert docs to ReST and rename to *.rst
The conversion is actually: - add blank lines and indentation in order to identify paragraphs; - fix tables markups; - add some lists markups; - mark literal blocks; - adjust title markups. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Mark Brown <broonie@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
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-dm-delay
-========
-
-Device-Mapper's "delay" target delays reads and/or writes
-and maps them to different devices.
-
-Parameters:
- <device> <offset> <delay> [<write_device> <write_offset> <write_delay>
- [<flush_device> <flush_offset> <flush_delay>]]
-
-With separate write parameters, the first set is only used for reads.
-Offsets are specified in sectors.
-Delays are specified in milliseconds.
-
-Example scripts
-===============
-[[
-#!/bin/sh
-# Create device delaying rw operation for 500ms
-echo "0 `blockdev --getsz $1` delay $1 0 500" | dmsetup create delayed
-]]
-
-[[
-#!/bin/sh
-# Create device delaying only write operation for 500ms and
-# splitting reads and writes to different devices $1 $2
-echo "0 `blockdev --getsz $1` delay $1 0 0 $2 0 500" | dmsetup create delayed
-]]