On Wed, Aug 11, 1999 at 06:23:24PM +0200, Dag-Erling Smorgrav wrote: > Josef Karthauser <j...@pavilion.net> writes: > > Ahha - of course. Ok, let me re-phrase the question then. By looking > > at the contents of the superblocks on a UFS file system it's possible to > > reconstruct a disklabel for a slice. > > Well, it's possible to reconstruct the label information for *that > particular UFS file system*, since if you know the location of the > superblock (or one of its backup copies), you can determine the offset > and size of the FS. It won't tell you anything about *other* > partitions though.
That's ok, because each slice has its _own_ label. If the bios partition table loses it's mind that's a little more work :). > > Is this trick possible with other kinds of file systems too? > > That's totally dependent on the particular file system. For instance, > a swap partition contains no metadata (that I know of), so all you can > do is deduce it's size and position from the sizes and positions of > surrounding partitions, and of the slice they're in. > What are the implications of adding a metadata structure to the swap structure. (It only needs a block :). [Although thinking out loud, it's complicated because there's no 'newfs' process that touches the partition, on the other hand the size of the partition is known at swap-mounting time, so the meta data could be written at that point.] Joe -- Josef Karthauser FreeBSD: How many times have you booted today? Technical Manager Viagra for your server (http://www.uk.freebsd.org) Pavilion Internet plc. [...@pavilion.net, j...@uk.freebsd.org, j...@tao.org.uk] To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message
