Description

• relates to c8d: Use reference counting while mounting a snapshot #45698
• relates to c8d: mark stargz as requiring reference-counted mounts #45781
• relates to c8d: mark stargz as requiring reference-counted mounts #45781 (comment)
• slightly related to c8d: docker info "storage driver" section should provide more details #46757

Commit 21c0a54 (#45698) introduced a hard-coded list of snapshotters (refCountedFileSystems) that we know need reference-counting. With containerd, the list of available snapshotters is not known (additional snapshotters may be installed on the system), so maintaining a hard-coded list is problematic to maintain.

We should consider to either;

• unconditionally use reference-counting (as suggested in c8d: mark stargz as requiring reference-counted mounts #45781 (comment))
• get this information from the snapshotter (also related: c8d: docker info "storage driver" section should provide more details #46757)
• ☝️ this may depend on containerd 2.0 though, so perhaps we need to go for the alternative in the meantime