On Thu, Dec 09, 2021 at 10:36:13AM -0500, Jeff Layton wrote: > Ceph is going to add fscrypt support, but we still want encrypted > filenames to be composed of printable characters, so we can maintain > compatibility with clients that don't support fscrypt. > > We could just adopt fscrypt's current nokey name format, but that is > subject to change in the future, and it also contains dirhash fields > that we don't need for cephfs. Because of this, we're going to concoct > our own scheme for encoding encrypted filenames. It's very similar to > fscrypt's current scheme, but doesn't bother with the dirhash fields. > > The ceph encoding scheme will use base64 encoding as well, and we also > want it to avoid characters that are illegal in filenames. Export the > fscrypt base64 encoding/decoding routines so we can use them in ceph's > fscrypt implementation. > > Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx> > --- > fs/crypto/fname.c | 8 ++++---- > include/linux/fscrypt.h | 5 +++++ > 2 files changed, 9 insertions(+), 4 deletions(-) Acked-by: Eric Biggers <ebiggers@xxxxxxxxxx> - Eric
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