ceph-fuse and subtree cephfs mount question

[Goncalo Borges <goncalo.borges@xxxxxxxxxxxxx>]

Dear CephFS experts

Before it was possible to mount a subtree of a filesystem using ceph-fuse and -r option.

In invernalis, I am not understanding how that is working, and I am only able to mount the full tree. 'ceph-fuse --help' does not seem to show that option although 'man ceph-fuse' says it should work.

Basically, this works:

# /usr/local/ceph920/bin/ceph-fuse -m MON_IP:6789 /coepp/cephfs
ceph-fuse[7826]: starting ceph client
2015-12-15 01:00:03.231332 7f70c2ffc720 -1 init, newargv = 0x7f70c655a840 newargc=11
ceph-fuse[7826]: starting fuse

# ll  /coepp/cephfs
total 2
drwxr-xr-x 1 root root 0 Dec 15 00:45 adl
drwxr-xr-x 1 root root 0 Dec 15 00:45 mel
drwxr-xr-x 1 root root 0 Dec 15 00:47 share
drwxr-xr-x 1 root root 0 Dec 15 00:44 syd

But this doesn't

# ceph-fuse -m MON_IP:6789 -r /coepp/cephfs/syd /coepp/cephfs
ceph-fuse[8906]: starting ceph client
2015-12-15 01:02:12.897012 7ff838e4d720 -1 init, newargv = 0x7ff83d00a870 newargc=11
ceph-fuse[8906]: ceph mount failed with (2) No such file or directory
ceph-fuse[8904]: mount failed: (2) No such file or directory

Is it just me not fully understanding how to properly do it?

TIA
Goncalo

-- 
Goncalo Borges
Research Computing
ARC Centre of Excellence for Particle Physics at the Terascale
School of Physics A28 | University of Sydney, NSW  2006
T: +61 2 93511937

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