On Tue, Dec 19, 2006 at 03:09:03PM -0500, Jeffrey Hutzelman wrote: > > > On Tuesday, December 19, 2006 01:54:56 PM +0000 Darren J Moffat > <[EMAIL PROTECTED]> wrote: > > >While I think having this in the VOP/FOP layer is interesting it isn't > >the problem I was trying to solve and to be completely honest I'm really > >not interested in solving this outside of ZFS - why make it easy for > >people to stay on UFS ;-) > > Because as great as ZFS is, someday someone is going to run into a problem > that it doesn't solve. Having the right abstraction to begin with will > make that day easier when it comes.
I understand what Darren was proposing now. He's talking about wiping blocks as they are freed. I initially thought he meant something like a guarantee on file deletion that the file's data is gone -- but snapshots and clones are in conflict with that, but not with wiping blocks as they are freed. Now, if we had a bleach(1) operation, then we'd need a bleach(2) and a VOP_BLEACH and fop_bleach. But that's not what Darren is proposing. > >I didn't have anything per file, but exactly what you said. The policy > >was when files are removed, when data sets are removed, when pools are > >removed. > > Well, that's great for situations where things actually get removed. It's > not so great for things that get rewritten rather than removed, and it > seems nearly useless for vdevs. I think there's some benefit to making the > functionality directly available to user-mode, but more importantly, > there's a definite advantage to a system in which the user knows that a > file was bleached when they removed it, and not decades later when someone > gets around to removing a stray snapshot. That difference can have serious > legal and/or intelligence implications. Yes, I think that a bleach operation that forcefully removes a file's contents even in all snapshots and clones, could be useful. But I'm not sure that we can get it. Nico -- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
