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From c1a6e218334ac561a695fa4cefd69208ba93107e Mon Sep 17 00:00:00 2001
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From: Zdenek Kabelac <zkabelac@redhat.com>
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Date: Sat, 14 Sep 2019 01:08:14 +0200
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Subject: [PATCH 6/6] thin: activate layer pool aas read-only LV
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When lvm2 is activating layered pool LV (to basically keep pool opened,
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the other function used to be 'locking' be in sync with DM table)
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use this LV in read-only mode - this prevents 'write' access into
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data volume content of thin-pool.
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Note: since EMPTY/unused thin-pool is created as 'public LV' for generic
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use by any user who i.e. wish to maintain thin-pool and thins himself.
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At this moment, thin-pool appears as writable LV. As soon as the 1st.
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thinLV is created, layer volume will appear is 'read-only' LV from this moment.
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(cherry picked from commit 2e51535b18f3a05428f087f3916ebce5c08d58d1)
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Conflicts:
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WHATS_NEW
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---
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WHATS_NEW | 1 +
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lib/activate/dev_manager.c | 5 +++++
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2 files changed, 6 insertions(+)
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diff --git a/WHATS_NEW b/WHATS_NEW
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index d1f4530..00b84f9 100644
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--- a/WHATS_NEW
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+++ b/WHATS_NEW
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@@ -2,6 +2,7 @@ Version 2.02.187 -
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===================================
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Prevent creating VGs with PVs with different logical block sizes.
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Pvmove runs in exlusively activating mode for exclusively active LVs.
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+ Activate thin-pool layered volume as 'read-only' device.
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Enhance validation for thin and cache pool conversion and swapping.
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Version 2.02.186 - 27th August 2019
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diff --git a/lib/activate/dev_manager.c b/lib/activate/dev_manager.c
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index dc64159..56608e3 100644
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--- a/lib/activate/dev_manager.c
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+++ b/lib/activate/dev_manager.c
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@@ -84,6 +84,11 @@ int read_only_lv(const struct logical_volume *lv, const struct lv_activate_opts
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if (lv_is_raid_image(lv) || lv_is_raid_metadata(lv))
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return 0; /* Keep RAID SubLvs writable */
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+ if (!layer) {
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+ if (lv_is_thin_pool(lv))
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+ return 1;
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+ }
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+
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return (laopts->read_only || !(lv->status & LVM_WRITE));
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}
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--
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1.8.3.1
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