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I just installed encfs from source on a synology disk-station (DSM 4.1) and it seems to work fine. But when I try to unmount my encfs directory via fusermount -u I get the error message:

fusermount -u myencfstestdir
/bin/umount: unrecognized option `--no-canonicalize'
BusyBox v1.16.1 (2012-09-26 03:30:23 CST) multi-call binary.


Unmount file systems

-n Don't erase /etc/mtab entries
-r Try to remount devices as read-only if mount is busy
-l Lazy umount (detach filesystem)
-f Force umount (i.e., unreachable NFS server)
-d Free loop device if it has been used

However the directory seems to be unmounted. I can mount it with encfs afterwards without problems.

Should I care about this error message? If not, how can I suppress it, or even better, how can I fix it?

share|improve this question
Have you tried using umount from util-linux directly? – vh4x0r Mar 23 '13 at 10:31
Seems to work, however the encfs manual says that one should use fusermount -u. So I am not sure if something may go wrong when using umount (I want to use it for backup purposes, so everything should work for 100%)... – student Mar 23 '13 at 10:45

You are using BusyBox' umount, presumably that one doesn't understand encfs specific flags (and its mount might also do things wrong). Does the encfs package include mount/unmount programs? Better use those. Perhaps you need to build a BusyBox with encfs support?

share|improve this answer
I don't know if encfs does include mount/umount programs, but I guess it doesn't. How can I build BusyBox with encfs support? – student Mar 17 '13 at 10:03

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