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 Date Mon, 2 Aug 1999 21:44:18 +1000 From Nathan Hand <> Subject Re: Your backup is unsafe!
On Mon, Aug 02, 1999 at 11:31:38AM +0100, Robert de Bath wrote:> On Mon, 2 Aug 1999, Nathan Hand wrote:> > > The problem isn't straightforward. Simply stated, VFAT has two names for> > a file, both are valid, both must be preserved, only one is visible, but> > both are usable at all times. This does not map onto any UNIX filesystem> > so some magic is needed.>> Under _Windows_ both are valid. Do you really think this brain dammage> should be kept in Linux? There is no reason for the short name to be> visable _except_ when there are interactions with DOS, this comes down> to dosemu, samba and backups.In retrospect I have to agree. It's clearly better to only show the longfilenames and have special "VFAT aware" programs to handle backups. Thiscan be done via ioctl, a /proc interface, etc. It's a robust solution.> > How about a magic file in each VFAT directory which contains mappings of> > long to short filenames. You only see the long names using standard UNIX> > file I/O. Then backups work, because you backup the magic file too, so a> > restore will put the correct short/long mappings back.>> Yes, I thought of this but the coding would be horrific. I think this would> work out to be just the same as using a directory by directory sfn_backup,> and IMO it's better to do it in userspace and keep those horrors from the> kernel.Yes, I agree. The existing Linux VFAT filesystem is clean, UNIX-like, ithides the major braindamages, and it fails in very few cases. Far betterto solve specific problems (like VFAT backups) with specialised tools.-- Nathan Hand - Chirp Web Design - http://www.chirp.com.au/ - $e^{i\pi}+1 = 0$Phone: +61 2 6230 1871   Fax: +61 2 6230 1515   E-mail: nathanh@chirp.com.au-To unsubscribe from this list: send the line "unsubscribe linux-kernel" inthe body of a message to majordomo@vger.rutgers.eduPlease read the FAQ at http://www.tux.org/lkml/

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