Hi! And here's yet another revision. The main difference from v4 is the addition of a patch to prevent the creation of snapshots in directories that are encrypted but that are not unlocked (i.e. no key available). As before, the following ceph 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 Changes since v4: - Explicitly added the encoding base for kstrtou64() as we do know that the inode numbers are in decimal. - New patch to prevent the creation of snapshots in encrypted directories that do not have the key loaded. 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 (5): 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 ceph: prevent snapshots to be created in encrypted locked directories Documentation/filesystems/ceph.rst | 10 ++ fs/ceph/crypto.c | 252 +++++++++++++++++++++++++---- fs/ceph/crypto.h | 14 +- fs/ceph/dir.c | 7 +- fs/ceph/inode.c | 33 +++- 5 files changed, 278 insertions(+), 38 deletions(-)
