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