libceph: deprecate [no]cephx_require_signatures options

These options were introduced in 3.19 with support for message signing
and are rather useless, as explained in commit a51983e4dd2d ("libceph:
add nocephx_sign_messages option").  Deprecate them.

In case there is someone out there with a cluster that lacks support
for MSG_AUTH feature (very unlikely but has to be considered since we
haven't formally raised the bar from argonaut to bobtail yet), make
nocephx_sign_messages also waive MSG_AUTH requirement.  This is probably
how it should have been done in the first place -- if we aren't going
to sign, requiring the signing feature makes no sense.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
---
 include/linux/ceph/libceph.h |  7 +++----
 net/ceph/ceph_common.c       | 11 +++++------
 2 files changed, 8 insertions(+), 10 deletions(-)

On Mon, 2021-01-25 at 18:35 +0100, Ilya Dryomov wrote:
> These options were introduced in 3.19 with support for message signing
> and are rather useless, as explained in commit a51983e4dd2d ("libceph:
> add nocephx_sign_messages option").  Deprecate them.
> 
> In case there is someone out there with a cluster that lacks support
> for MSG_AUTH feature (very unlikely but has to be considered since we
> haven't formally raised the bar from argonaut to bobtail yet), make
> nocephx_sign_messages also waive MSG_AUTH requirement.  This is probably
> how it should have been done in the first place -- if we aren't going
> to sign, requiring the signing feature makes no sense.
> 
> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
> ---
>  include/linux/ceph/libceph.h |  7 +++----
>  net/ceph/ceph_common.c       | 11 +++++------
>  2 files changed, 8 insertions(+), 10 deletions(-)
> 
> diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
> index eb9008bb3992..409d8c29bc4f 100644
> --- a/include/linux/ceph/libceph.h
> +++ b/include/linux/ceph/libceph.h
> @@ -32,10 +32,9 @@
>  #define CEPH_OPT_NOSHARE          (1<<1) /* don't share client with other sbs */
>  #define CEPH_OPT_MYIP             (1<<2) /* specified my ip */
>  #define CEPH_OPT_NOCRC            (1<<3) /* no data crc on writes (msgr1) */
> -#define CEPH_OPT_NOMSGAUTH	  (1<<4) /* don't require msg signing feat */
> -#define CEPH_OPT_TCP_NODELAY	  (1<<5) /* TCP_NODELAY on TCP sockets */
> -#define CEPH_OPT_NOMSGSIGN	  (1<<6) /* don't sign msgs (msgr1) */
> -#define CEPH_OPT_ABORT_ON_FULL	  (1<<7) /* abort w/ ENOSPC when full */
> +#define CEPH_OPT_TCP_NODELAY      (1<<4) /* TCP_NODELAY on TCP sockets */
> +#define CEPH_OPT_NOMSGSIGN        (1<<5) /* don't sign msgs (msgr1) */
> +#define CEPH_OPT_ABORT_ON_FULL    (1<<6) /* abort w/ ENOSPC when full */
>  
> 
>  #define CEPH_OPT_DEFAULT   (CEPH_OPT_TCP_NODELAY)
>  
> 
> diff --git a/net/ceph/ceph_common.c b/net/ceph/ceph_common.c
> index 271287c5ec12..bec181181d41 100644
> --- a/net/ceph/ceph_common.c
> +++ b/net/ceph/ceph_common.c
> @@ -307,7 +307,8 @@ static const struct constant_table ceph_param_ms_mode[] = {
>  
> 
>  static const struct fs_parameter_spec ceph_parameters[] = {
>  	fsparam_flag	("abort_on_full",		Opt_abort_on_full),
> -	fsparam_flag_no ("cephx_require_signatures",	Opt_cephx_require_signatures),
> +	__fsparam	(NULL, "cephx_require_signatures", Opt_cephx_require_signatures,
> +			 fs_param_neg_with_no|fs_param_deprecated, NULL),
>  	fsparam_flag_no ("cephx_sign_messages",		Opt_cephx_sign_messages),
>  	fsparam_flag_no ("crc",				Opt_crc),
>  	fsparam_string	("crush_location",		Opt_crush_location),
> @@ -596,9 +597,9 @@ int ceph_parse_param(struct fs_parameter *param, struct ceph_options *opt,
>  		break;
>  	case Opt_cephx_require_signatures:
>  		if (!result.negated)
> -			opt->flags &= ~CEPH_OPT_NOMSGAUTH;
> +			warn_plog(&log, "Ignoring cephx_require_signatures");
>  		else
> -			opt->flags |= CEPH_OPT_NOMSGAUTH;
> +			warn_plog(&log, "Ignoring nocephx_require_signatures, use nocephx_sign_messages");
>  		break;
>  	case Opt_cephx_sign_messages:
>  		if (!result.negated)
> @@ -686,8 +687,6 @@ int ceph_print_client_options(struct seq_file *m, struct ceph_client *client,
>  		seq_puts(m, "noshare,");
>  	if (opt->flags & CEPH_OPT_NOCRC)
>  		seq_puts(m, "nocrc,");
> -	if (opt->flags & CEPH_OPT_NOMSGAUTH)
> -		seq_puts(m, "nocephx_require_signatures,");
>  	if (opt->flags & CEPH_OPT_NOMSGSIGN)
>  		seq_puts(m, "nocephx_sign_messages,");
>  	if ((opt->flags & CEPH_OPT_TCP_NODELAY) == 0)
> @@ -756,7 +755,7 @@ struct ceph_client *ceph_create_client(struct ceph_options *opt, void *private)
>  	client->supported_features = CEPH_FEATURES_SUPPORTED_DEFAULT;
>  	client->required_features = CEPH_FEATURES_REQUIRED_DEFAULT;
>  
> 
> -	if (!ceph_test_opt(client, NOMSGAUTH))
> +	if (!ceph_test_opt(client, NOMSGSIGN))
>  		client->required_features |= CEPH_FEATURE_MSG_AUTH;
>  
> 
>  	/* msgr */


Reviewed-by: Jeff Layton <jlayton@kernel.org>