kernel/Documentation/device-mapper/delay.txt, branch linux-5.1.y

dm delay: add flush as a third class of IO

2018-07-27T19:24:19Z

Add a new class for dm-delay that delays flush requests. Previously, flushes were delayed as writes, but it caused problems if the user needed to create a device with one or a few slow sectors for the purpose of testing - all flushes would be forwarded to this device and delayed, and that skews the test results. Fix this by allowing to select 0 delay for flushes. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer

Documentation/device-mapper: s/getsize/getsz/

2016-12-14T09:54:27Z

According to `man blockdev': --getsize Print device size (32-bit!) in sectors. Deprecated in favor of the --getsz option. ... --getsz Get size in 512-byte sectors. Hence, occurrences of `--getsize' should be replaced with `--getsz', which this commit has achieved as follows: $ cd "$repo" $ git grep -l -e --getsz Documentation/device-mapper/delay.txt Documentation/device-mapper/dm-crypt.txt Documentation/device-mapper/linear.txt Documentation/device-mapper/log-writes.txt Documentation/device-mapper/striped.txt Documentation/device-mapper/switch.txt $ cd Documentation/device-mapper $ sed -i s/getsize/getsz/g * Signed-off-by: Michael Witten Signed-off-by: Jiri Kosina

dm delay: document that offsets are specified in sectors

2015-10-31T23:06:05Z

Only delay params are mentioned in delay.txt. Mention offsets just like documents for linear and flakey do. Signed-off-by: Tomohiro Kusumi Signed-off-by: Mike Snitzer

dm: delay target

2007-05-09T19:30:47Z

New device-mapper target that can delay I/O (for testing). Reads can be separated from writes, redirected to different underlying devices and delayed by differing amounts of time. Signed-off-by: Heinz Mauelshagen Signed-off-by: Milan Broz Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds