On Thu, Jul 30, 2009 at 10:53 AM, James Walmsley<[email protected]> wrote: > Actually thats just being developed into FullFAT already in > preparation for the 1.0.0 release. I believe I already mentioned it, > but here's a link the the linux kernel mailing list that explains how > the patch works and why its legally valid. > > http://lkml.org/lkml/2009/6/26/314 -- A legal discussion about the patch. > http://lkml.org/lkml/2009/6/26/313 -- Technical details of what the patch > does. > > FAT stores a checksum in LFNs of the shortname, this can be used to > verify the integrity of LFN entries in a directory. Of course using > the linux patch, the short name can be used for other puposes. However > its not really journaling because you still have to scan all the > directories. This takes a long time.
Right. The set of patches I am thinking of is actually older than Tridge's recent patent avoidance work. But I think the concept was the same. If there is a performance hit then it would not worth it. > Sarocet also makes a good point about the problem with a ReactOS > journaling file. The journal should store some kind of hash or > checksum value of the state of the FAT table (which is probably too > big). Or atleast the directories affected by the journal changes. If > this hash differs before journal transactions are committed to the FS > then the journal should clear that transaction and not commit it. > > Really journaling should only be enabled for a ReactOS system > partition, using journaling on removable media wouldn't bring any > great benefit, because of the effect that Sarocet described. > > Still I think the journaling is something we won't add until the > driver is working and stable. I agree. It would be nice to have but that is way down the road but for now, it would just be nice to have a bullet proof fat32 implementation although I suspect a lot of our problems are deeper than the driver itself. If I recall there has been quite a bit of work in the past to get our vfat driver to function on Windows. Thanks -- Steven Edwards "There is one thing stronger than all the armies in the world, and that is an idea whose time has come." - Victor Hugo _______________________________________________ Ros-dev mailing list [email protected] http://www.reactos.org/mailman/listinfo/ros-dev
