qubes-installer-qubes-os/blivet/0004-Backport-lvm-thin-pool-metadata-size-functions-from-.patch

From 7a4cfbeb1f971d4968248a6002a365835f11c72e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marek=20Marczykowski-G=C3=B3recki?=
 <marmarek@invisiblethingslab.com>
Date: Wed, 23 Oct 2019 00:21:02 +0200
Subject: [PATCH] Backport lvm thin pool metadata size functions from BlockDev
 2.0
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Organization: Invisible Things Lab
Cc: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>

Those are included only in BlockDev >= 2.0 API (libblockdev>=2.1), but
we don't have luxury of such new version. Since it's just one short
function and two constants, "copy" (translating from C) them directly
into blivet/devices/lvm.py.

Signed-off-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
---
 blivet/devices/lvm.py | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/blivet/devices/lvm.py b/blivet/devices/lvm.py
index 39c6f342..94894272 100644
--- a/blivet/devices/lvm.py
+++ b/blivet/devices/lvm.py
@@ -56,6 +56,22 @@ from .dm import DMDevice
 from .md import MDRaidArrayDevice
 from .cache import Cache, CacheStats, CacheRequest
 
+# loose backport from BlockDev 2.0 interface
+LVM_DEFAULT_CHUNK_SIZE = 65536
+LVM_MIN_THPOOL_MD_SIZE = 2 * 2**20  # 2 MiB
+
+def get_thpool_meta_size(pool_size, block_size, max_thins):
+
+    command = ["thin_metadata_size",
+               "-ub", "-n",
+               "-b", str(int(block_size)),
+               "-s", str(int(pool_size)),
+               "-m", str(int(max_thins))]
+    (rc, out) = util.run_program_and_capture_output(command)
+    if rc:
+        raise Exception("thin_metadata_size failed with %d" % rc)
+    return max(int(out), LVM_MIN_THPOOL_MD_SIZE)
+
 
 class LVPVSpec(object):
     """ Class for specifying how much space on a PV should be allocated for some LV """
-- 
2.20.1