From: Jeff Layton <jlayton@xxxxxxxxxx> commit 0fa8263367db9287aa0632f96c1a5f93cc478150 upstream. Eduard reported a problem mounting cephfs on s390 arch. The feature mask sent by the MDS is little-endian, so we need to convert it before storing and testing against it. Cc: stable@xxxxxxxxxxxxxxx Reported-and-Tested-by: Eduard Shishkin <edward6@xxxxxxxxxxxxx> Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx> Reviewed-by: "Yan, Zheng" <zyan@xxxxxxxxxx> Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/ceph/mds_client.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -3116,8 +3116,7 @@ static void handle_session(struct ceph_m void *end = p + msg->front.iov_len; struct ceph_mds_session_head *h; u32 op; - u64 seq; - unsigned long features = 0; + u64 seq, features = 0; int wake = 0; bool blacklisted = false; @@ -3136,9 +3135,8 @@ static void handle_session(struct ceph_m goto bad; /* version >= 3, feature bits */ ceph_decode_32_safe(&p, end, len, bad); - ceph_decode_need(&p, end, len, bad); - memcpy(&features, p, min_t(size_t, len, sizeof(features))); - p += len; + ceph_decode_64_safe(&p, end, features, bad); + p += len - sizeof(features); } mutex_lock(&mdsc->mutex);
