This is effectively a resend, but re-based atop Anna's current tree. I can add the samples back in an another patchset. Right now, it is possible to mount NFS with an non-matching super block user ns, and NFS sunrpc user ns. This (for the user) results in an awkward set of interactions if using anything other than auth_null, where the UIDs being sent to the server are different than the local UIDs being checked. This can cause "breakage", where if you try to communicate with the NFS server with any other set of mappings, it breaks. This is after the initial v5.10 merge window, so hopefully this patchset can be reconsidered, and maybe we can make forward progress? I think that it takes a relatively conservative approach in enabling user namespaces, and it prevents the case where someone is using auth_gss (for now), as the mappings are non-trivial. Changes since v3: * Rebase atop Anna's tree Changes since v2: * Removed samples * Split out NFSv2/v3 patchset from NFSv4 patchset * Added restrictions around use Changes since v1: * Added samples Sargun Dhillon (2): NFS: NFSv2/NFSv3: Use cred from fs_context during mount NFSv4: Refactor NFS to use user namespaces fs/nfs/client.c | 10 ++++++++-- fs/nfs/nfs4client.c | 27 ++++++++++++++++++++++++++- fs/nfs/nfs4idmap.c | 2 +- fs/nfs/nfs4idmap.h | 3 ++- 4 files changed, 37 insertions(+), 5 deletions(-) base-commit: 8c39076c276be0b31982e44654e2c2357473258a -- 2.25.1
