Paul Gideon Dann (2011-12-02 13:51):
> On Friday 02 Dec 2011 12:09:59 Timothy Redaelli wrote:
> > You can try to edit the udev mount options:
> >
> > # echo 'ACTION=="add", ENV{mount_options}="sync"' >
> > /etc/udev.d/rules.d/99-mount-options.rules
> >
> > Then you must reload udev rules:
> >
> > # udevadm control --reload-rules
>
> This seems like the right thing to do, but I'd appreciate a little explanation
> of the theory behind this fix. I haven't played around much with udev rules so
> far. However, this looks like it might mount *all* disks with the sync
> option. Could you explain how it's supposed to work?
>
> I would have thought that, as was mentioned earlier, udev wouldn't be
> responsible for mount options. Wouldn't that be handled by udisks somehow?
>
> I've tried a "mount -o remount,sync ...", and that fixes the issue, so it's
> just a question of figuring out why USB drives aren't getting the sync option
> automatically. It used to work OK until about 3/4 months ago. Maybe a new
> udev broke this behaviour on my machine?
>
> Paul
There can't be any corruption after a successful unmount.
1. Run sudo umount /path/to/mounted/dir; echo returncode=$?
2. If you see 'returncode=0' on the last line, continue with 3.
3. Remove your USB drive.
4. Attach your USB drive.
5. If you see data corruption, it's one of:
* faulty/misbehaving USB dongle (test with another USB device);
* bad filesystem on your USB device (test with a freshly created one);
* a bug in Linux kernel (report upstream).
The 'flush' and 'sync' mount options are not needed under normal
circumstances (as in don't use if you don't know what you are doing).
--
-- Rogutės Sparnuotos
