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Date:      Mon, 27 Feb 2017 17:54:01 +0000 (UTC)
From:      Mariusz Zaborski <oshogbo@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r314359 - in head: sbin/geom/class/part sys/geom/part
Message-ID:  <201702271754.v1RHs1LI096908@repo.freebsd.org>

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Author: oshogbo
Date: Mon Feb 27 17:54:01 2017
New Revision: 314359
URL: https://svnweb.freebsd.org/changeset/base/314359

Log:
  Add sysctl to control auto resize of the GEOM metadata.
  
  Reviewed by:	AllanJude
  Differential Revision:	https://reviews.freebsd.org/D9603

Modified:
  head/sbin/geom/class/part/gpart.8
  head/sys/geom/part/g_part.c

Modified: head/sbin/geom/class/part/gpart.8
==============================================================================
--- head/sbin/geom/class/part/gpart.8	Mon Feb 27 17:50:38 2017	(r314358)
+++ head/sbin/geom/class/part/gpart.8	Mon Feb 27 17:54:01 2017	(r314359)
@@ -1146,6 +1146,18 @@ variables can be used to control the beh
 GEOM class.
 The default value is shown next to each variable.
 .Bl -tag -width indent
+.It Va kern.geom.part.auto_resize: No 1
+This variable controls automatic resize behavior of
+.Nm
+GEOM class.
+When this variable is enable and new size of provider is detected, the schema
+metadata is resized but all changes are not saved to disk, until
+.Cm gpart commit
+is run to confirm changes.
+This behavior is also reported with diagnostic message:
+.Sy "GEOM_PART: (provider) was automatically resized."
+.Sy "Use `gpart commit (provider)` to save changes or `gpart undo (provider)`"
+.Sy "to revert them."
 .It Va kern.geom.part.check_integrity : No 1
 This variable controls the behaviour of metadata integrity checks.
 When integrity checks are enabled, the

Modified: head/sys/geom/part/g_part.c
==============================================================================
--- head/sys/geom/part/g_part.c	Mon Feb 27 17:50:38 2017	(r314358)
+++ head/sys/geom/part/g_part.c	Mon Feb 27 17:54:01 2017	(r314359)
@@ -135,6 +135,10 @@ static u_int check_integrity = 1;
 SYSCTL_UINT(_kern_geom_part, OID_AUTO, check_integrity,
     CTLFLAG_RWTUN, &check_integrity, 1,
     "Enable integrity checking");
+static u_int auto_resize = 1;
+SYSCTL_UINT(_kern_geom_part, OID_AUTO, auto_resize,
+    CTLFLAG_RW, &auto_resize, 1,
+    "Enable auto resize");
 
 /*
  * The GEOM partitioning class.
@@ -2095,6 +2099,9 @@ g_part_resize(struct g_consumer *cp)
 	G_PART_TRACE((G_T_TOPOLOGY, "%s(%s)", __func__, cp->provider->name));
 	g_topology_assert();
 
+	if (auto_resize == 0)
+		return;
+
 	table = cp->geom->softc;
 	if (table->gpt_opened == 0) {
 		if (g_access(cp, 1, 1, 1) != 0)



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