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Date:      Sat, 27 Oct 2018 03:37:15 +0000 (UTC)
From:      Xin LI <delphij@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r339804 - head/sys/geom/eli
Message-ID:  <201810270337.w9R3bF1M099252@repo.freebsd.org>
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Author: delphij
Date: Sat Oct 27 03:37:14 2018
New Revision: 339804
URL: https://svnweb.freebsd.org/changeset/base/339804

Log:
  Restore backward compatibility for "attach" verb.
  
  In r332361 and r333439, two new parameters were added to geli attach
  verb using gctl_get_paraml, which requires the value to be present.
  This would prevent old geli(8) binary from attaching geli(4) device
  as they have no knowledge about the new parameters.
  
  Restore backward compatibility by treating the absense of these two
  values as seeing the default value supplied by userland.
  
  PR:		232595
  Reviewed by:	oshogbo
  MFC after:	3 days
  Differential Revision:	https://reviews.freebsd.org/D17680

Modified:
  head/sys/geom/eli/g_eli_ctl.c

Modified: head/sys/geom/eli/g_eli_ctl.c
==============================================================================
--- head/sys/geom/eli/g_eli_ctl.c	Sat Oct 27 03:16:32 2018	(r339803)
+++ head/sys/geom/eli/g_eli_ctl.c	Sat Oct 27 03:37:14 2018	(r339804)
@@ -59,8 +59,8 @@ g_eli_ctl_attach(struct gctl_req *req, struct g_class 
 	struct g_provider *pp;
 	const char *name;
 	u_char *key, mkey[G_ELI_DATAIVKEYLEN];
-	int *nargs, *detach, *readonly, *dryrun;
-	int keysize, error, nkey;
+	int *nargs, *detach, *readonly, *dryrunp;
+	int keysize, error, nkey, dryrun, dummy;
 	intmax_t *valp;
 
 	g_topology_assert();
@@ -81,12 +81,14 @@ g_eli_ctl_attach(struct gctl_req *req, struct g_class 
 		return;
 	}
 
-	valp = gctl_get_paraml(req, "keyno", sizeof(*valp));
-	if (valp == NULL) {
-		gctl_error(req, "No '%s' argument.", "keyno");
-		return;
+	/* "keyno" is optional for backward compatibility */
+	nkey = -1;
+	valp = gctl_get_param(req, "keyno", &dummy);
+	if (valp != NULL) {
+		valp = gctl_get_paraml(req, "keyno", sizeof(*valp));
+		if (valp != NULL)
+			nkey = *valp;
 	}
-	nkey = *valp;
 	if (nkey < -1 || nkey >= G_ELI_MAXMKEYS) {
 		gctl_error(req, "Invalid '%s' argument.", "keyno");
 		return;
@@ -98,10 +100,13 @@ g_eli_ctl_attach(struct gctl_req *req, struct g_class 
 		return;
 	}
 
-	dryrun = gctl_get_paraml(req, "dryrun", sizeof(*dryrun));
-	if (dryrun == NULL) {
-		gctl_error(req, "No '%s' argument.", "dryrun");
-		return;
+	/* "dryrun" is optional for backward compatibility */
+	dryrun = 0;
+	dryrunp = gctl_get_param(req, "dryrun", &dummy);
+	if (dryrunp != NULL) {
+		dryrunp = gctl_get_paraml(req, "dryrun", sizeof(*dryrunp));
+		if (dryrunp != NULL)
+			dryrun = *dryrunp;
 	}
 
 	if (*detach && *readonly) {
@@ -161,7 +166,7 @@ g_eli_ctl_attach(struct gctl_req *req, struct g_class 
 		md.md_flags |= G_ELI_FLAG_WO_DETACH;
 	if (*readonly)
 		md.md_flags |= G_ELI_FLAG_RO;
-	if (!*dryrun)
+	if (!dryrun)
 		g_eli_create(req, mp, pp, &md, mkey, nkey);
 	explicit_bzero(mkey, sizeof(mkey));
 	explicit_bzero(&md, sizeof(md));

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