Hi! As reported recently in the ceph-users mailing-list[1], the kernel client behaves differently from the fuse client regarding mounting subdirs where quotas are in effect. I've also created a bug to track this issue[2]. The following patches are a possible way of fixing this issue. The performance impact should be close to zero if the mount is done in the CephFS root inode. When we're mounting subdirs, we may have extra queries to the MDSs, depending on how many extra realms we'll need to loop through. Warning: this is just an RFC, and the patches are only lightly tested! [1] http://lists.ceph.com/pipermail/ceph-users-ceph.com/2019-February/033357.html [2] https://tracker.ceph.com/issues/38482 Luis Henriques (2): ceph: factor out ceph_lookup_inode() ceph: quota: fix quota subdir mounts fs/ceph/caps.c | 2 +- fs/ceph/export.c | 14 +++++++++++++- fs/ceph/quota.c | 30 +++++++++++++++++++++++++++--- fs/ceph/snap.c | 3 +++ fs/ceph/super.h | 3 +++ 5 files changed, 47 insertions(+), 5 deletions(-)
