Re: Data Deduplication with the help of an online filesystem check

Thomas Glanzmann
2009-04-28T05:22:15Z

Hello Chris,

> There is a btrfs ioctl to clone individual files, and this could be used
> to implement an online dedup. But, since it is happening from userland,
> you can't lock out all of the other users of a given file.

> So, the dedup application would be responsible for making sure a given
> file was not being changed while the dedup scan was running.

I see, does that mean that I can not do ,,dedup'' for files that are
currently opened by a userland program?

Thomas