[PATCH] libceph: deprecate [no]cephx_require_signatures options

[Ilya Dryomov <idryomov@gmail.com>]

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 */
-- 
2.19.2