mount.ntfs-3g canonicalizes devmapper device names, preventing unmounting

Bug #755190 reported by Phillip Susi
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
ntfs-3g (Ubuntu)
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Bug Description

Binary package hint: ntfs-3g

mount -t ntfs /dev/mapper/foo /mnt results in mount/mtab showing /dev/dm-N being mounted in /mnt instead of /dev/mapper/foo. This means that later, when you try to umount /dev/mapper/foo, it fails saying that is not mounted because mount can not find /dev/mapper/foo in mtab. Mounting other filesystems on devmapper devices do not canonicalize the name like this, and so neither should ntfs-3g

This bug was discovered as a contributory cause of bug #725408.

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