Add ACCESS_HIDDEN_LV state flag.

An LV that has the ACCESS_HIDDEN_LV state flag set conveys to the user
that it is an internal LV but that it may be managed directly.  As such
it should be displayed without requiring special flags (e.g. lvs -a).
Otherwise this important LV's usage information will not be easily seen
or managed by the end user.

The -shared cow LV has the ACCESS_HIDDEN_LV state flag set.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
 lib/format_text/flags.c          |    1 +
 lib/metadata/metadata-exported.h |    4 ++++
 lib/metadata/snapshot_manip.c    |   12 ++++++++++++
 tools/lvresize.c                 |    2 +-
 tools/toollib.c                  |    7 ++++---
 5 files changed, 22 insertions(+), 4 deletions(-)

Index: LVM2.2.02.85/lib/format_text/flags.c
===================================================================
--- LVM2.2.02.85.orig/lib/format_text/flags.c	2011-05-23 16:08:02.000000000 +0200
+++ LVM2.2.02.85/lib/format_text/flags.c	2011-05-23 16:08:08.000000000 +0200
@@ -53,6 +53,7 @@ static const struct flag _lv_flags[] = {
 	{LVM_WRITE, "WRITE", STATUS_FLAG},
 	{FIXED_MINOR, "FIXED_MINOR", STATUS_FLAG},
 	{VISIBLE_LV, "VISIBLE", STATUS_FLAG},
+	{ACCESS_HIDDEN_LV, "ACCESS_HIDDEN", STATUS_FLAG},
 	{PVMOVE, "PVMOVE", STATUS_FLAG},
 	{LOCKED, "LOCKED", STATUS_FLAG},
 	{LV_NOTSYNCED, "NOTSYNCED", STATUS_FLAG},
Index: LVM2.2.02.85/lib/metadata/metadata-exported.h
===================================================================
--- LVM2.2.02.85.orig/lib/metadata/metadata-exported.h	2011-05-23 16:08:02.000000000 +0200
+++ LVM2.2.02.85/lib/metadata/metadata-exported.h	2011-05-23 16:08:08.000000000 +0200
@@ -76,6 +76,7 @@
 
 #define MERGING			0x10000000U	/* LV SEG */
 #define SNAPSHOT_SHARED		0x20000000U	/* LV SEG */
+#define ACCESS_HIDDEN_LV	0x40000000U	/* LV */
 
 #define REPLICATOR		0x20000000U	/* LV -internal use only for replicator */
 #define REPLICATOR_LOG		0x40000000U	/* LV -internal use only for replicator-dev */
@@ -628,6 +629,9 @@ int lv_is_multisnap_origin(const struct 
 int lv_is_multisnap_cow(const struct logical_volume *lv);
 int lv_is_shared_cow(const struct logical_volume *lv);
 
+/* Test if given LV is accessible yet hidden */
+int lv_is_accessible_hidden(const struct logical_volume *lv);
+
 /* Test if given LV is visible from user's perspective */
 int lv_is_visible(const struct logical_volume *lv);
 
Index: LVM2.2.02.85/lib/metadata/snapshot_manip.c
===================================================================
--- LVM2.2.02.85.orig/lib/metadata/snapshot_manip.c	2011-05-23 16:08:02.000000000 +0200
+++ LVM2.2.02.85/lib/metadata/snapshot_manip.c	2011-05-23 16:08:08.000000000 +0200
@@ -31,6 +31,17 @@ int lv_is_cow(const struct logical_volum
 	return (!lv_is_origin(lv) && lv->snapshot) ? 1 : 0;
 }
 
+int lv_is_accessible_hidden(const struct logical_volume *lv)
+{
+	if (lv->status & SNAPSHOT)
+		return 0;
+
+	if (lv_is_cow(lv))
+		return (find_cow(lv)->lv->status & ACCESS_HIDDEN_LV) ? 1 : 0;
+
+	return (lv->status & ACCESS_HIDDEN_LV) ? 1 : 0;
+}
+
 int lv_is_visible(const struct logical_volume *lv)
 {
 	if (lv->status & SNAPSHOT)
@@ -144,6 +155,7 @@ static void init_shared_snapshot(struct 
 				 struct logical_volume *origin)
 {
 	cow_seg->lv->status &= ~VISIBLE_LV;
+	cow_seg->lv->status |= ACCESS_HIDDEN_LV;
 	origin->snapshot = cow_seg;
 	origin->status |= SNAPSHOT_SHARED;
 }
Index: LVM2.2.02.85/tools/lvresize.c
===================================================================
--- LVM2.2.02.85.orig/tools/lvresize.c	2011-05-23 16:07:58.000000000 +0200
+++ LVM2.2.02.85/tools/lvresize.c	2011-05-23 16:08:08.000000000 +0200
@@ -365,7 +365,7 @@ static int _lvresize(struct cmd_context 
 		_adjust_policy_params(cmd, lv, lp);
 	}
 
-	if (!lv_is_visible(lv)) {
+	if (!lv_is_visible(lv) && !lv_is_accessible_hidden(lv)) {
 		log_error("Can't resize internal logical volume %s", lv->name);
 		return ECMD_FAILED;
 	}
Index: LVM2.2.02.85/tools/toollib.c
===================================================================
--- LVM2.2.02.85.orig/tools/toollib.c	2011-05-20 14:57:40.000000000 +0200
+++ LVM2.2.02.85/tools/toollib.c	2011-05-23 16:08:09.000000000 +0200
@@ -127,10 +127,11 @@ int process_each_lv_in_vg(struct cmd_con
 			continue;
 
 		/*
-		 * Only let hidden LVs through it --all was used or the LVs 
-		 * were specifically named on the command line.
+		 * Only let inaccessible hidden LVs through if --all was used or
+		 * the LVs were specifically named on the command line.
 		 */
-		if (!lvargs_supplied && !lv_is_visible(lvl->lv) && !arg_count(cmd, all_ARG))
+		if (!lvargs_supplied && !arg_count(cmd, all_ARG) &&
+		    !lv_is_visible(lvl->lv) && !lv_is_accessible_hidden(lvl->lv))
 			continue;
 
 		/* Should we process this LV? */