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authorJeff Layton <jlayton@kernel.org>2021-01-11 12:35:48 -0500
committerIlya Dryomov <idryomov@gmail.com>2023-08-24 11:24:34 +0200
commit4ac4c23eaa389859f746a6ef31e1c71d880312f4 (patch)
tree55df2631c8a337942744251fb071c13bd6984360 /fs/super.c
parent24865e75c1a4e70ac9e8328dae8b5e03712a6e8c (diff)
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>
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