> Adding support for filesystem mount options is trivial. Support for 
> "discard" was added recently for XFS. I guess support for "prjquota" 
> could be added too.

Exactly why I'm reporting for prjquota today

> Does using "prjquota" require extra mkfs.xfs parameters ?

Not that I'm aware of (happy to be corrected though), as far as I know mount 
option is all is needed, see below for e.g:

# mkdir -p /data/vol
# dd if=/dev/zero of=/data/vol/xfsprjquota bs=1 count=0 seek=1G
# mkfs.xfs /data/vol/xfsprjquota >/dev/null 2>&1
# mount -o defaults,prjquota -t xfs /data/vol/xfsprjquota /mnt
# xfs_quota -c 'print' /mnt
Filesystem          Pathname
/mnt                /dev/loop1 (pquota)


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