From eb16230427fc1081f8515e6ad69ccf99ca521e5d Mon Sep 17 00:00:00 2001
From: Vojtech Trefny <vtrefny@redhat.com>
Date: Tue, 4 Apr 2023 13:31:40 +0200
Subject: [PATCH 1/2] Add support for filesystem online resize
Resolves: rhbz#2168680
---
blivet/devices/lvm.py | 13 ++++++++-----
blivet/devices/partition.py | 11 ++++++-----
blivet/flags.py | 3 +++
blivet/formats/fs.py | 32 ++++++++++++++++++++++++++++----
blivet/formats/fslib.py | 7 +++++++
5 files changed, 52 insertions(+), 14 deletions(-)
diff --git a/blivet/devices/lvm.py b/blivet/devices/lvm.py
index c3132457..ca45c4b5 100644
--- a/blivet/devices/lvm.py
+++ b/blivet/devices/lvm.py
@@ -42,6 +42,7 @@ from .. import errors
from .. import util
from ..storage_log import log_method_call
from .. import udev
+from ..flags import flags
from ..size import Size, KiB, MiB, ROUND_UP, ROUND_DOWN
from ..static_data.lvm_info import lvs_info
from ..tasks import availability
@@ -2729,12 +2730,14 @@ class LVMLogicalVolumeDevice(LVMLogicalVolumeBase, LVMInternalLogicalVolumeMixin
# Setup VG parents (in case they are dmraid partitions for example)
self.vg.setup_parents(orig=True)
- if self.original_format.exists:
- self.original_format.teardown()
- if self.format.exists:
- self.format.teardown()
+ if not flags.allow_online_fs_resize:
+ if self.original_format.exists:
+ self.original_format.teardown()
+ if self.format.exists:
+ self.format.teardown()
+
+ udev.settle()
- udev.settle()
blockdev.lvm.lvresize(self.vg.name, self._name, self.size)
@type_specific
diff --git a/blivet/devices/partition.py b/blivet/devices/partition.py
index 0e9250ce..6ae4b8d3 100644
--- a/blivet/devices/partition.py
+++ b/blivet/devices/partition.py
@@ -745,11 +745,12 @@ class PartitionDevice(StorageDevice):
if not self.exists:
raise errors.DeviceError("device has not been created")
- # don't teardown when resizing luks
- if self.format.type == "luks" and self.children:
- self.children[0].format.teardown()
- else:
- self.teardown()
+ if not flags.allow_online_fs_resize:
+ # don't teardown when resizing luks
+ if self.format.type == "luks" and self.children:
+ self.children[0].format.teardown()
+ else:
+ self.teardown()
if not self.sysfs_path:
return
diff --git a/blivet/flags.py b/blivet/flags.py
index 6364164d..ecfa7ad7 100644
--- a/blivet/flags.py
+++ b/blivet/flags.py
@@ -91,6 +91,9 @@ class Flags(object):
self.debug_threads = False
+ # Allow online filesystem resizes
+ self.allow_online_fs_resize = False
+
def get_boot_cmdline(self):
with open("/proc/cmdline") as f:
buf = f.read().strip()
diff --git a/blivet/formats/fs.py b/blivet/formats/fs.py
index 33922f3a..3f553eb0 100644
--- a/blivet/formats/fs.py
+++ b/blivet/formats/fs.py
@@ -56,7 +56,7 @@ from ..i18n import N_
from .. import udev
from ..mounts import mounts_cache
-from .fslib import kernel_filesystems
+from .fslib import kernel_filesystems, FSResize
import logging
log = logging.getLogger("blivet")
@@ -88,6 +88,9 @@ class FS(DeviceFormat):
# value is already unpredictable and can change in the future...
_metadata_size_factor = 1.0
+ # support for resize: grow/shrink, online/offline
+ _resize_support = 0
+
config_actions_map = {"label": "write_label"}
def __init__(self, **kwargs):
@@ -436,12 +439,27 @@ class FS(DeviceFormat):
self.write_uuid()
def _pre_resize(self):
- # file systems need a check before being resized
- self.do_check()
+ if self.status:
+ if flags.allow_online_fs_resize:
+ if self.target_size > self.size and not self._resize_support & FSResize.ONLINE_GROW:
+ raise FSError("This filesystem doesn't support online growing")
+ if self.target_size < self.size and not self._resize_support & FSResize.ONLINE_SHRINK:
+ raise FSError("This filesystem doesn't support online shrinking")
+ else:
+ raise FSError("Resizing of mounted filesystems is disabled")
+
+ if self.status:
+ # fsck tools in general don't allow checks on mounted filesystems
+ log.debug("Filesystem on %s is mounted, not checking", self.device)
+ else:
+ # file systems need a check before being resized
+ self.do_check()
+
super(FS, self)._pre_resize()
def _post_resize(self):
- self.do_check()
+ if not self.status:
+ self.do_check()
super(FS, self)._post_resize()
def do_check(self):
@@ -838,6 +856,7 @@ class Ext2FS(FS):
_formattable = True
_supported = True
_resizable = True
+ _resize_support = FSResize.ONLINE_GROW | FSResize.OFFLINE_GROW | FSResize.OFFLINE_SHRINK
_linux_native = True
_max_size = Size("8 TiB")
_dump = True
@@ -1097,6 +1116,7 @@ class XFS(FS):
_linux_native = True
_supported = True
_resizable = True
+ _resize_support = FSResize.ONLINE_GROW | FSResize.OFFLINE_GROW
_packages = ["xfsprogs"]
_fsck_class = fsck.XFSCK
_info_class = fsinfo.XFSInfo
@@ -1247,6 +1267,7 @@ class NTFS(FS):
_labelfs = fslabeling.NTFSLabeling()
_uuidfs = fsuuid.NTFSUUID()
_resizable = True
+ _resize_support = FSResize.OFFLINE_GROW | FSResize.OFFLINE_SHRINK
_formattable = True
_supported = True
_min_size = Size("1 MiB")
@@ -1490,6 +1511,9 @@ class TmpFS(NoDevFS):
# same, nothing actually needs to be set
pass
+ def _pre_resize(self):
+ self.do_check()
+
def do_resize(self):
# Override superclass method to record whether mount options
# should include an explicit size specification.
diff --git a/blivet/formats/fslib.py b/blivet/formats/fslib.py
index ea93b1fd..8722e942 100644
--- a/blivet/formats/fslib.py
+++ b/blivet/formats/fslib.py
@@ -36,3 +36,10 @@ def update_kernel_filesystems():
update_kernel_filesystems()
+
+
+class FSResize():
+ OFFLINE_SHRINK = 1 << 1
+ OFFLINE_GROW = 1 << 2
+ ONLINE_SHRINK = 1 << 3
+ ONLINE_GROW = 1 << 4
--
2.40.1
From 3fce5d0bfd7b09a976ff49feed15077477c6a425 Mon Sep 17 00:00:00 2001
From: Vojtech Trefny <vtrefny@redhat.com>
Date: Thu, 6 Apr 2023 14:02:11 +0200
Subject: [PATCH 2/2] Add a test case for filesystem online resize
Related: rhbz#2168680
---
tests/storage_tests/formats_test/fs_test.py | 43 ++++++++++++++++++++-
1 file changed, 42 insertions(+), 1 deletion(-)
diff --git a/tests/storage_tests/formats_test/fs_test.py b/tests/storage_tests/formats_test/fs_test.py
index 97f4cbbe..1d42dc21 100644
--- a/tests/storage_tests/formats_test/fs_test.py
+++ b/tests/storage_tests/formats_test/fs_test.py
@@ -6,9 +6,10 @@ import parted
import blivet.formats.fs as fs
from blivet.size import Size, ROUND_DOWN
-from blivet.errors import DeviceFormatError
+from blivet.errors import DeviceFormatError, FSError
from blivet.formats import get_format
from blivet.devices import PartitionDevice, DiskDevice
+from blivet.flags import flags
from .loopbackedtestcase import LoopBackedTestCase
@@ -26,6 +27,46 @@ class Ext3FSTestCase(Ext2FSTestCase):
class Ext4FSTestCase(Ext3FSTestCase):
_fs_class = fs.Ext4FS
+ def test_online_resize(self):
+ an_fs = self._fs_class()
+ if not an_fs.formattable:
+ self.skipTest("can not create filesystem %s" % an_fs.name)
+ an_fs.device = self.loop_devices[0]
+ self.assertIsNone(an_fs.create())
+ an_fs.update_size_info()
+
+ if not self.can_resize(an_fs):
+ self.skipTest("filesystem is not resizable")
+
+ # shrink offline first (ext doesn't support online shrinking)
+ TARGET_SIZE = Size("64 MiB")
+ an_fs.target_size = TARGET_SIZE
+ self.assertEqual(an_fs.target_size, TARGET_SIZE)
+ self.assertNotEqual(an_fs._size, TARGET_SIZE)
+ self.assertIsNone(an_fs.do_resize())
+
+ with tempfile.TemporaryDirectory() as mountpoint:
+ an_fs.mount(mountpoint=mountpoint)
+
+ # grow back when mounted
+ TARGET_SIZE = Size("100 MiB")
+ an_fs.target_size = TARGET_SIZE
+ self.assertEqual(an_fs.target_size, TARGET_SIZE)
+ self.assertNotEqual(an_fs._size, TARGET_SIZE)
+
+ # should fail, online resize disabled by default
+ with self.assertRaisesRegex(FSError, "Resizing of mounted filesystems is disabled"):
+ an_fs.do_resize()
+
+ # enable online resize
+ flags.allow_online_fs_resize = True
+ an_fs.do_resize()
+ flags.allow_online_fs_resize = False
+ self._test_sizes(an_fs)
+ self.assertEqual(an_fs.system_mountpoint, mountpoint)
+
+ an_fs.unmount()
+
class FATFSTestCase(fstesting.FSAsRoot):
_fs_class = fs.FATFS
--
2.40.1