Here are my patches for adding the dm-log-writes target to the kernel and the supporting xfstests to go along with it. The dm patch has a pretty detailed documentation file to describe the methodology behind the target and how to use it. The xfstest that is generic has been tested on btrfs, xfs and ext4 and currently fails on all of them in different ways with my kernel (which is just 3.19 so don't be too alarmed). The btrfs specific one passes currently, more evil tests will come later. Basically the idea behind this target and these tests are to give our file systems a more thorough power fail scenario testing. The target logs writes in order that things would have made it safely to disk and then the tests replay that log in various ways and check the result. You can find the supporting userspace program here https://github.com/josefbacik/log-writes I apologize for it being ugly, I was trying to get it working as quickly as possible. There is an example script in there that you can use to do an exhaustive step by step through a log to make sure your file system is always consistent. Thanks, Josef -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
