Description of problem:


Because we use the "mkdirs" method for making parents to a subvolume, the perms for the subvolume specified by --mode are used for all parents too. This is wrong because you can get:

pdonnell@vossi04 ~/ceph/build$ bin/ceph fs subvolume create a d --mode=777 --size=$((2**30))
pdonnell@vossi04 ~/mnt/tmp.0cSPBAJM59$ ls -lha volumes/
total 1.5K
drwxrwxrwx. 3 root     root      120 Jul 27 19:17 .
drwxr-xr-x. 4 pdonnell pdonnell 473M Jul 27 19:17 ..
-rwxr-xr-x. 1 root     root        0 Jul 27 19:17 _:d.meta
drwxrwxrwx. 3 root     root      120 Jul 27 19:17 _nogroup

volumes should be 0755 and _nogroup should be 0755.


Please look into the attached upstream tracker for more info

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