File bug-1158628_10-thin-activate-layer-pool-aas-read-only-LV.patch of Package lvm2.17787

From 66f69e766e576692ea32328c1921acbacb69ed14 Mon Sep 17 00:00:00 2001
From: Zdenek Kabelac <zkabelac@redhat.com>
Date: Sat, 14 Sep 2019 01:08:14 +0200
Subject: [PATCH] thin: activate layer pool aas read-only LV

When lvm2 is activating layered pool LV (to basically keep pool opened,
the other function used to be 'locking' be in sync with DM table)
use this LV in read-only mode - this prevents 'write' access into
data volume content of thin-pool.

Note: since EMPTY/unused thin-pool is created as 'public LV' for generic
use by any user who i.e. wish to maintain thin-pool and thins himself.
At this moment, thin-pool appears as writable LV.  As soon as the 1st.
thinLV is created, layer volume will appear is 'read-only' LV from this moment.
---
 lib/activate/dev_manager.c | 5 +++++
 1 files changed, 5 insertions(+)

diff --git a/lib/activate/dev_manager.c b/lib/activate/dev_manager.c
index c780deaa02..32fdcb94f7 100644
--- a/lib/activate/dev_manager.c
+++ b/lib/activate/dev_manager.c
@@ -85,6 +85,11 @@ int read_only_lv(const struct logical_volume *lv, const struct lv_activate_opts
 	if (lv_is_raid_image(lv) || lv_is_raid_metadata(lv))
 		return 0; /* Keep RAID SubLvs writable */
 
+	if (!layer) {
+		if (lv_is_thin_pool(lv))
+			return 1;
+	}
+
 	return (laopts->read_only || !(lv->status & LVM_WRITE));
 }
 
-- 
2.24.0