[RFC PATCH v2 0/3] ceph: add support for snapshot names encryption

["Luís Henriques" <lhenriques@suse.de>]

Hi!

A couple of changes since v1:

- Dropped the dentry->d_flags change in ceph_mkdir().  Thanks to Xiubo
  suggestion, patch 0001 now skips calling ceph_fscrypt_prepare_context()
  if we're handling a snapshot.

- Added error handling to ceph_get_snapdir() in patch 0001 (Jeff had
  already pointed that out but I forgot to include that change in previous
  revision).

- Rebased patch 0002 to the latest wip-fscrypt branch.

- Added some documentation regarding snapshots naming restrictions.

As before, in order to test this code the following PRs are required:

  mds: add protection from clients without fscrypt support #45073
  mds: use the whole string as the snapshot long name #45192
  mds: support alternate names for snapshots #45224
  mds: limit the snapshot names to 240 characters #45312

Luís Henriques (3):
  ceph: add support for encrypted snapshot names
  ceph: add support for handling encrypted snapshot names
  ceph: update documentation regarding snapshot naming limitations

 Documentation/filesystems/ceph.rst |  10 ++
 fs/ceph/crypto.c                   | 158 +++++++++++++++++++++++++----
 fs/ceph/crypto.h                   |  11 +-
 fs/ceph/inode.c                    |  31 +++++-
 4 files changed, 182 insertions(+), 28 deletions(-)