diff --git a/0003-Add-support-for-filesystem-online-resize.patch b/0003-Add-support-for-filesystem-online-resize.patch
new file mode 100644
index 0000000..977deae
--- /dev/null
+++ b/0003-Add-support-for-filesystem-online-resize.patch
@@ -0,0 +1,183 @@
+From 3ee2a9da6251179c47ff6c2dc5c969e79f31e9e0 Mon Sep 17 00:00:00 2001
+From: Vojtech Trefny <vtrefny@redhat.com>
+Date: Tue, 4 Apr 2023 13:31:40 +0200
+Subject: [PATCH] Add support for filesystem online resize
+
+---
+ blivet/devices/lvm.py       | 10 ++++++----
+ blivet/devices/partition.py | 11 ++++++-----
+ blivet/flags.py             |  3 +++
+ blivet/formats/fs.py        | 32 ++++++++++++++++++++++++++++----
+ blivet/formats/fslib.py     |  7 +++++++
+ 5 files changed, 50 insertions(+), 13 deletions(-)
+
+diff --git a/blivet/devices/lvm.py b/blivet/devices/lvm.py
+index 434c359f..04e03e82 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
+@@ -2719,10 +2720,11 @@ 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()
+         blockdev.lvm.lvresize(self.vg.name, self._name, self.size)
+diff --git a/blivet/devices/partition.py b/blivet/devices/partition.py
+index e8bd2b7b..5bf3c713 100644
+--- a/blivet/devices/partition.py
++++ b/blivet/devices/partition.py
+@@ -794,11 +794,12 @@ 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 f0034070..716f0df4 100644
+--- a/blivet/flags.py
++++ b/blivet/flags.py
+@@ -95,6 +95,9 @@ class Flags(object):
+         # https://uapi-group.org/specifications/specs/discoverable_partitions_specification/
+         self.gpt_discoverable_partitions = 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 8df881b8..acc1f9cb 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")
+@@ -1502,6 +1523,9 @@ 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
+
diff --git a/python-blivet.spec b/python-blivet.spec
index 6c85a7e..6e38a87 100644
--- a/python-blivet.spec
+++ b/python-blivet.spec
@@ -23,7 +23,7 @@ Version: 3.7.1
 
 #%%global prerelease .b2
 # prerelease, if defined, should be something like .a1, .b1, .b2.dev1, or .c2
-Release: 2%{?prerelease}%{?dist}
+Release: 3%{?prerelease}%{?dist}
 Epoch: 1
 License: LGPL-2.1-or-later
 %global realname blivet
@@ -36,6 +36,7 @@ Patch0: 0001-remove-btrfs-plugin.patch
 %endif
 
 Patch1: 0002-Add-support-for-specifying-stripe-size-for-RAID-LVs.patch
+Patch2: 0003-Add-support-for-filesystem-online-resize.patch
 
 # Versions of required components (done so we make sure the buildrequires
 # match the requires versions of things).
@@ -198,6 +199,9 @@ configuration.
 %endif
 
 %changelog
+* Tue May 23 2023 Vojtech Trefny <vtrefny@redhat.com> - 3.7.1-3
+- Add support for filesystem online resize
+
 * Thu May 04 2023 Vojtech Trefny <vtrefny@redhat.com> - 3.7.1-2
 - Add support for specifying stripe size for RAID LVs