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130 lines
5.2 KiB
130 lines
5.2 KiB
From 0777b9d519421f3c46f6dcd51e39ecdc2956e2e0 Mon Sep 17 00:00:00 2001
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From: Jan Pokorny <japokorn@redhat.com>
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Date: Thu, 25 Apr 2024 14:06:13 +0200
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Subject: [PATCH] Added support for PV grow
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Storage role requires support for a case when PV has to be resized to
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fill all available space when its device's size changes (usually on VM).
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A new flag 'grow_to_fill' was added, which marks the device for size
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expansion (all available space it taken).
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Proper size is determined by LVM, avoiding inaccurate size
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calculations in blivet.
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---
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blivet/formats/__init__.py | 4 +++-
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blivet/formats/lvmpv.py | 23 ++++++++++++++++++-
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blivet/tasks/pvtask.py | 7 +++++-
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.../storage_tests/formats_test/lvmpv_test.py | 10 ++++++++
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4 files changed, 41 insertions(+), 3 deletions(-)
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diff --git a/blivet/formats/__init__.py b/blivet/formats/__init__.py
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index b1ad740e..eb8b6ab3 100644
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--- a/blivet/formats/__init__.py
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+++ b/blivet/formats/__init__.py
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@@ -424,7 +424,9 @@ class DeviceFormat(ObjectID):
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if not self.resizable:
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raise FormatResizeError("format not resizable", self.device)
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- if self.target_size == self.current_size:
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+ # skip if sizes are equal unless grow to fill on lvmpv is requested
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+ if (self.target_size == self.current_size and
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+ (self.type != "lvmpv" or not self.grow_to_fill)): # pylint: disable=no-member
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return
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if not self._resize.available:
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diff --git a/blivet/formats/lvmpv.py b/blivet/formats/lvmpv.py
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index 65acedbe..51fa4a3c 100644
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--- a/blivet/formats/lvmpv.py
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+++ b/blivet/formats/lvmpv.py
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@@ -33,7 +33,7 @@ from ..devicelibs import lvm
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from ..tasks import availability, pvtask
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from ..i18n import N_
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from ..size import Size
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-from ..errors import PhysicalVolumeError
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+from ..errors import DeviceFormatError, PhysicalVolumeError
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from . import DeviceFormat, register_device_format
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from .. import udev
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from ..static_data.lvm_info import pvs_info, vgs_info
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@@ -98,6 +98,9 @@ class LVMPhysicalVolume(DeviceFormat):
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self.inconsistent_vg = False
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+ # when set to True, blivet will try to resize the PV to fill all available space
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+ self._grow_to_fill = False
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+
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def __repr__(self):
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s = DeviceFormat.__repr__(self)
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s += (" vg_name = %(vg_name)s vg_uuid = %(vg_uuid)s"
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@@ -106,6 +109,24 @@ class LVMPhysicalVolume(DeviceFormat):
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"pe_start": self.pe_start, "data_alignment": self.data_alignment})
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return s
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+ @property
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+ def grow_to_fill(self):
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+ """
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+ Can be set to True to mark format for resize so it matches size of its device.
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+ (Main usecase is disk size increase on VM)
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+ Uses blockdev/lvm for exact new size calculation.
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+ ActionResizeFormat has to be executed to apply the change.
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+ Format has to be resizable (i.e. run format.update_size_info() first) to allow this.
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+ """
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+ return self._grow_to_fill
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+
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+ @grow_to_fill.setter
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+ def grow_to_fill(self, fill: bool):
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+ if fill is True:
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+ if not self.resizable:
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+ raise DeviceFormatError("format is not resizable")
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+ self._grow_to_fill = fill
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+
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@property
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def dict(self):
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d = super(LVMPhysicalVolume, self).dict
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diff --git a/blivet/tasks/pvtask.py b/blivet/tasks/pvtask.py
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index 04c8a4d1..b5bd72e0 100644
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--- a/blivet/tasks/pvtask.py
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+++ b/blivet/tasks/pvtask.py
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@@ -82,6 +82,11 @@ class PVResize(task.BasicApplication, dfresize.DFResizeTask):
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def do_task(self): # pylint: disable=arguments-differ
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""" Resizes the LVMPV format. """
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try:
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- blockdev.lvm.pvresize(self.pv.device, self.pv.target_size.convert_to(self.unit))
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+ if self.pv.grow_to_fill:
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+ # resize PV to fill all available space on device by omitting
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+ # the size parameter
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+ blockdev.lvm.pvresize(self.pv.device, 0)
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+ else:
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+ blockdev.lvm.pvresize(self.pv.device, self.pv.target_size.convert_to(self.unit))
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except blockdev.LVMError as e:
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raise PhysicalVolumeError(e)
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diff --git a/tests/storage_tests/formats_test/lvmpv_test.py b/tests/storage_tests/formats_test/lvmpv_test.py
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index cdc33ec4..d2811f3e 100644
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--- a/tests/storage_tests/formats_test/lvmpv_test.py
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+++ b/tests/storage_tests/formats_test/lvmpv_test.py
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@@ -37,6 +37,9 @@ class LVMPVTestCase(loopbackedtestcase.LoopBackedTestCase):
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self.fmt.update_size_info()
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self.assertTrue(self.fmt.resizable)
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+ # save the pv maximum size
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+ maxpvsize = self.fmt.current_size
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+
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# resize the format
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new_size = Size("50 MiB")
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self.fmt.target_size = new_size
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@@ -46,5 +49,12 @@ class LVMPVTestCase(loopbackedtestcase.LoopBackedTestCase):
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self.fmt.update_size_info()
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self.assertEqual(self.fmt.current_size, new_size)
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+ # Test growing PV to fill all available space on the device
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+ self.fmt.grow_to_fill = True
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+ self.fmt.do_resize()
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+
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+ self.fmt.update_size_info()
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+ self.assertEqual(self.fmt.current_size, maxpvsize)
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+
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def _pvremove(self):
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self.fmt._destroy()
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--
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2.45.0
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