On 12/06/10 11:16, Jeremy Henty wrote:
>
> I have an external USB disk that I mount with a custom udev rule.
> This has worked perfectly for ages, through many kernel versions. But
> since I upgraded my LFS 6.5 system to 2.6.34 the disk does not appear
> in /etc/mtab, and therefore not in the output of mount either (which
> is annoying since it breaks my backup script). The disk definitely is
> mounted; I can see its contents in the mount point and it appears in
> /proc/mounts. What on earth has changed in this kernel version?
>
> Here's the udev rule:
>
> # cat /etc/udev/rules.d/01-local-external-disk.rules
> KERNEL=="sd?1", SUBSYSTEMS=="usb", ATTRS{product}=="Seagate External Drive",
> ATTRS{serial}==" SW063611533", RUN+="/sbin/udev_local_external_disk"
>
>
> And here's the mount script that rule runs:
>
> # cat /sbin/udev_local_external_disk
> #!/bin/sh
>
> mount -t ext3 -o nodev,noexec,nosuid,ro "$DEVNAME" /media/disk/number/0
>
>
> The weird thing is that if I unmount the device and run the script
> manually:
>
> # DEVNAME=/dev/sdd1 /sbin/udev_local_external_disk
>
>
> ...then the device does appear in /etc/mtab and the mount output. Now
> SysV must be running the script at boot time, otherwise the device
> would not mount at all. Why does the script behave differently at
> boot time rather than afterwards?
>
> Any ideas? I'm stumped.
>
My guess is that when udev is first run the kernel has mounted the root
filesystem read only. When you run the script by hand the root
filesystem is read/write so mount can update /etc/fstab. have a look at
the /etc/rc.d/init.d/mountfs bootscript. Try adding a line like
mount -f /media/disk/number/0
Does the udev rule work properly if you plug the external disk in after
you've booted?
Andy
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