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| author | Jeff Layton <jlayton@kernel.org> | 2021-01-11 12:35:48 -0500 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2023-08-24 11:24:34 +0200 |
| commit | 4ac4c23eaa389859f746a6ef31e1c71d880312f4 (patch) | |
| tree | 55df2631c8a337942744251fb071c13bd6984360 /fs/ceph/mds_client.h | |
| parent | 24865e75c1a4e70ac9e8328dae8b5e03712a6e8c (diff) | |
| download | linux-4ac4c23eaa389859f746a6ef31e1c71d880312f4.tar.gz linux-4ac4c23eaa389859f746a6ef31e1c71d880312f4.tar.bz2 linux-4ac4c23eaa389859f746a6ef31e1c71d880312f4.zip | |
ceph: decode alternate_name in lease info
Ceph is a bit different from local filesystems, in that we don't want
to store filenames as raw binary data, since we may also be dealing
with clients that don't support fscrypt.
We could just base64-encode the encrypted filenames, but that could
leave us with filenames longer than NAME_MAX. It turns out that the
MDS doesn't care much about filename length, but the clients do.
To manage this, we've added a new "alternate name" field that can be
optionally added to any dentry that we'll use to store the binary
crypttext of the filename if its base64-encoded value will be longer
than NAME_MAX. When a dentry has one of these names attached, the MDS
will send it along in the lease info, which we can then store for
later usage.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/mds_client.h')
| -rw-r--r-- | fs/ceph/mds_client.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 3cf874925519..a4a6f7893b9e 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -44,6 +44,7 @@ enum ceph_feature_type { CEPHFS_FEATURE_MULTI_RECONNECT, \ CEPHFS_FEATURE_DELEG_INO, \ CEPHFS_FEATURE_METRIC_COLLECT, \ + CEPHFS_FEATURE_ALTERNATE_NAME, \ CEPHFS_FEATURE_NOTIFY_SESSION_STATE, \ CEPHFS_FEATURE_OP_GETVXATTR, \ } @@ -96,7 +97,9 @@ struct ceph_mds_reply_info_in { struct ceph_mds_reply_dir_entry { char *name; + u8 *altname; u32 name_len; + u32 altname_len; struct ceph_mds_reply_lease *lease; struct ceph_mds_reply_info_in inode; loff_t offset; @@ -120,7 +123,9 @@ struct ceph_mds_reply_info_parsed { struct ceph_mds_reply_info_in diri, targeti; struct ceph_mds_reply_dirfrag *dirfrag; char *dname; + u8 *altname; u32 dname_len; + u32 altname_len; struct ceph_mds_reply_lease *dlease; struct ceph_mds_reply_xattr xattr_info; |