On Thu, 6 Jun 2002, Oleg Drokin wrote: > On Thu, Jun 06, 2002 at 01:30:46AM -0400, S. Alexander Jacobson wrote: > > I just joined this list. Two question: > > 1. Can reiserfs detect that I have two copies of > > the same file on disk and store tham as one file > > Hm, you mean, each time you create a file, reiserfs should scan all > other files and see if there is exactly a file like you just wrote? > Hm, even something more complicated as you are writing to a file in > 4k chunks. > Definitely no.
I could imagine a cheaper implementation in which the fs computes an MD5 hash of each file as it is being written. If the hash matches the pre-existing hash of some other file, then consolidate. > > (doing a lazy copy) if someone writes to one of > > them? > > > 2. Is there a fast way to get access to the file > > change list? It would be nice to be able to do > > fast backup of changed files without having to > > traverse entire directory trees. > > No. I would presume that journalling gives access to this sort of recent information. It is really a question of whether applications may access the journal and whether the journal format is opaque. -Alex- ___________________________________________________________________ S. Alexander Jacobson i2x Media 1-212-787-1914 voice 1-603-288-1280 fax
