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thin: activate layer pool aas read-only LV

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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.
This commit is contained in:
Zdenek Kabelac 2019-09-14 01:08:14 +02:00
parent 693215716b
commit 66f69e766e
2 changed files with 6 additions and 0 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.03.06 -
================================
Activate thin-pool layered volume as 'read-only' device.
Ignore crypto devices with UUID signature CRYPT-SUBDEV.
Enhance validation for thin and cache pool conversion and swapping.
Improve internal removal of cached devices.

5
lib/activate/dev_manager.c
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@ -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));
}