Hello At zfs-discuss I asked if there is any tool to get a list of modified/removed/created files between two snapshots using information(shared blocks, etc.) on ZFS filesystem. The answer was no. I also asked if I could use incremental ZFS send stream to parse information from it, but someone said it is not possible, since there are no files, just DMU objects.
So now I try to code this feature by myself. I have read ZFS Source Tour and there was mention about ZFS traversal. By looking source code, I noticed it is used in ZFS send, so from there I tried to look how it works, but I still have many troubles understanding it. So here is the question: Do you know any good place to look for information about how to use ZFS traversal? Or can you give any basic practices to me? I already found out, that after getting some handles to snapshots I need to give traversing flags and a callback function, but I have no idea how the callback function is then called. I use ZFS on FreeBSD, and I noticed the code is little bit different than the code at ZFS Source Tour, so that makes some problems too. Also, do you know if this is even possible with ZFS traversal? As I mentioned, my main goal is to get list of names (and paths) of all modifications, removings and new files between two snapshots (that are already created) and it needs to be 100% correct. Also, it needs to be done very fast even in case of millions of files and dirs, so I think the only way to do this is by using data of block modifications straight from ZFS. Regards Henrik Heino
