On Tue, Jul 21, 2009 at 12:51:20PM +0200, Michael Prokop wrote:
> This issue might be related to
> A XFS partition is set to read-only mode (using 'blockdev --setro')
> and mounted. As soon as I *un*mount the filesystem there seem to
> happen write requests.
> I've a Tableau Forensic Bridge? which avoids the write requests and
> attached it to a Linux live-system running kernel 2.6.28 inside
> VMware and Virtualbox. I can easily reproduce the problem.
Block 0 is the superblock, so it appears like there is a superblock
write somewhere not guarded by an read-only check. Can you still
reproduce this with a current kernel? We now do have a testcase in
xfsqa (test 200) that checks exactly that scenario, but it doesn't
show issues on recent kernels.