Ceph » CephFS

If there is cluster upgrade, the older sr_t structs' flags would not have the SNAPSHOT_VISIBILITY flag bit set which means the existing subvolumes would report 0 instead of 1 for the vxattr ceph.dir.subvolume.snaps.visible which although doesn't lead to any actual denial of access to subvolume snapshots since the client config to respect snapshot visibility is set to false as default but might come as a surprise to any cluster operator to automatically get EPERMS when they toggle the client config to true. This isn't that big of a pain since one can definitely run ceph fs subvolume snapshot_visibility set command on the existing subvolume(s) post upgrade but a proper solution would be to change the in-memory flags while decoding the sr_t members.