dm: add log writes target

2015-04-15T16:10:24Z

Introduce a new target that is meant for file system developers to test file system integrity at particular points in the life of a file system. We capture all write requests and associated data and log them to a separate device for later replay. There is a userspace utility to do this replay. The idea behind this is to give file system developers a tool to verify that the file system is always consistent. Signed-off-by: Josef Bacik Reviewed-by: Zach Brown Signed-off-by: Mike Snitzer

kernel/Documentation/device-mapper/log-writes.txt, branch linux-4.3.y

dm: add log writes target