On Sun, Oct 12, 2008 at 10:10:54PM -0400, Ngo, Andrew wrote:
> Hi,
>
> This is my first attempt to report a stale mount problem. If this is
> not the relevant mail list, please let me know. I suspect that my
> problem is xfs related, thus I select this mailing list.
>
> I have a system that recently upgraded it's kernel to 2.6.25.14. The
> system's previous kernel was 2.6.18.-8.el5. With the previous kernel, I
> have no problem with executing the following commands when the system is
> in operation. Note that the /mnt/mountpoint is mounted on a XFS file
> system.
>
> mount -o rw,remount /mnt/mountpoint
> mount -o ro,remount /mnt/mountpoint
>
> With kernel 2.6.25.14, however, the mount command may be hang when
> changing from rw to ro. When this happen, system is very sluggish.
That's because the remount,ro is actually flushing all the dirty
data to disk in 2.6.25. There is also a check to catch when the
remount,ro fails to clean everything that is dirty - that's probably
what is triggering. Do you have an oops in the dmesg log when
mount hangs?
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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