linux-kernel - Re: [PATCH v4 0/4] ceph: add support for snapshot names encryption

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Date:   Mon, 18 Apr 2022 10:08:26 +0800
From:   Xiubo Li <xiubli@...hat.com>
To:     Luís Henriques <lhenriques@...e.de>,
        Jeff Layton <jlayton@...nel.org>,
        Ilya Dryomov <idryomov@...il.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 0/4] ceph: add support for snapshot names encryption


On 4/14/22 9:51 PM, Luís Henriques wrote:
> Hi!
>
> Time for another iteration on the encrypted snapshots names, which is
> mostly a rebase to the wip-fscrypt branch.  To test this, I've used ceph
> with the following PRs:
>
>    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
>
> Changes since v3:
>
> - Fixed WARN_ON() in ceph_encode_encrypted_dname()
>
> - Updated documentation and copyright notice for the base64
>    encoding/decoding implementaiton which was taken from the fscrypt base.
>
> Changes since v2:
>
> - Use ceph_find_inode() instead of ceph_get_inode() for finding a snapshot
>    parent in function parse_longname().  I've also added a fallback to
>    ceph_get_inode() in case we fail to find the inode.  This may happen if,
>    for example, the mount root doesn't include that inode.  The iput() was
>    also complemented by a discard_new_inode() if the inode is in the I_NEW
>    state. (patch 0002)
>
> - Move the check for '_' snapshots further up in the ceph_fname_to_usr()
>    and ceph_encode_encrypted_dname().  This fixes the case pointed out by
>    Xiubo in v2. (patch 0002)
>
> - Use NAME_MAX for tmp arrays (patch 0002)
>
> - Added an extra patch for replacing the base64url encoding by a different
>    encoding standard, the one used for IMAP mailboxes (which uses '+' and
>    ',' instead of '-' and '_').  This should fix the issue with snapshot
>    names starting with '_'. (patch 0003)
>
> 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.
>
>
> Luís Henriques (4):
>    ceph: add support for encrypted snapshot names
>    ceph: add support for handling encrypted snapshot names
>    ceph: update documentation regarding snapshot naming limitations
>    ceph: replace base64url by the encoding used for mailbox names
>
>   Documentation/filesystems/ceph.rst |  10 ++
>   fs/ceph/crypto.c                   | 252 +++++++++++++++++++++++++----
>   fs/ceph/crypto.h                   |  14 +-
>   fs/ceph/dir.c                      |   2 +-
>   fs/ceph/inode.c                    |  33 +++-
>   5 files changed, 273 insertions(+), 38 deletions(-)
>
This patch series LGTM.  Thanks Luis !

Reviewed-by: Xiubo Li <xiubli@...hat.com>