Re: BLKRRPART ioctl

Theodore Y. Ts'o (tytso@mit.edu)
Tue, 3 Aug 1999 18:55:46 -0400


Date: Tue, 03 Aug 1999 12:00:52 +0100
From: David Woodhouse <David.Woodhouse@mvhi.com>

tytso@mit.edu said:
> Or if you moved the start or end points of the partition!

If you move the start, OK. Moving the end is allowed as long as you
make sure you resize the filesystem before actually clobbering it.

If the filesystem is mounted, then you don't want to allow either the
start or the end of the filesystem to move. If you are playing with the
kernel patches do live-mounted resizes of ext2, then one could imagine a
patch where the partition remounting code asks the filesystem code for
permission about whether it is safe to allow the partition reloadto
proceed. But since those patches are still in development, a simple "if
the filesystem is in use, then it shouldn't change (or at least not let
it shrink!)" hueristic is probably the safest.

- Ted

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