Backport fix for handling newer ext fs versions

mkfs in F41 enables metadata_csum feature, make grub tolerate it.

QubesOS/qubes-issues#9402

0179-fs-ext2-Ignore-checksum-seed-incompat-feature.patch

@@ -0,0 +1,54 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Javier Martinez Canillas <[email protected]>
+Date: Fri, 11 Jun 2021 00:01:29 +0200
+Subject: [PATCH] fs/ext2: Ignore checksum seed incompat feature
+
+This incompat feature is used to denote that the filesystem stored its
+metadata checksum seed in the superblock. This is used to allow tune2fs
+to change the UUID on a mounted metadata_csum filesystem without having
+to rewrite all the disk metadata.
+
+But GRUB doesn't use the metadata checksum in anyway, so can just ignore
+this feature if is enabled. This is consistent with GRUB filesystem code
+in general which just does a best effort to access the filesystem's data.
+
+It may be removed from the ignored list in the future if supports to do
+metadata checksumming verification is added to the read-only FS driver.
+
+Suggested-by: Eric Sandeen <[email protected]>
+Suggested-by: Lukas Czerner <[email protected]>
+Signed-off-by: Javier Martinez Canillas <[email protected]>
+---
+ grub-core/fs/ext2.c | 10 +++++++++-
+ 1 file changed, 9 insertions(+), 1 deletion(-)
+
+diff --git a/grub-core/fs/ext2.c b/grub-core/fs/ext2.c
+index e7dd78e663..731d346f88 100644
+--- a/grub-core/fs/ext2.c
++++ b/grub-core/fs/ext2.c
+@@ -103,6 +103,7 @@ GRUB_MOD_LICENSE ("GPLv3+");
+ #define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
+ #define EXT4_FEATURE_INCOMPAT_MMP		0x0100
+ #define EXT4_FEATURE_INCOMPAT_FLEX_BG		0x0200
++#define EXT4_FEATURE_INCOMPAT_CSUM_SEED		0x2000
+ #define EXT4_FEATURE_INCOMPAT_ENCRYPT          0x10000
+
+ /* The set of back-incompatible features this driver DOES support. Add (OR)
+@@ -123,9 +124,16 @@ GRUB_MOD_LICENSE ("GPLv3+");
+  * mmp:            Not really back-incompatible - was added as such to
+  *                 avoid multiple read-write mounts. Safe to ignore for this
+  *                 RO driver.
++ * checksum seed:  Not really back-incompatible - was added to allow tools
++ *                 such as tune2fs to change the UUID on a mounted metadata
++ *                 checksummed filesystem. Safe to ignore for now since the
++ *                 driver doesn't support checksum verification. But it must
++ *                 be removed from this list if that support is added later.
++ *
+  */
+ #define EXT2_DRIVER_IGNORED_INCOMPAT ( EXT3_FEATURE_INCOMPAT_RECOVER \
+-				     | EXT4_FEATURE_INCOMPAT_MMP)
++				     | EXT4_FEATURE_INCOMPAT_MMP \
++				     | EXT4_FEATURE_INCOMPAT_CSUM_SEED)
+
+
+ #define EXT3_JOURNAL_MAGIC_NUMBER	0xc03b3998U

grub2.spec.in

@@ -779,6 +779,7 @@ Patch0144: 0144-grub-install-disable-support-for-EFI-platforms.patch
 Patch0147: 0147-Introduce-function-grub_debug_is_enabled-void-return.patch
 Patch0148: 0148-Don-t-clear-screen-when-debugging-is-enabled.patch
 Patch0154: 0154-Add-at_keyboard_fallback_set-var-to-force-the-set-ma.patch
+Patch0179: 0179-fs-ext2-Ignore-checksum-seed-incompat-feature.patch
 Patch0181: 0181-Suppress-gettext-error-message.patch
 Patch0183: 0183-templates-Check-for-EFI-at-runtime-instead-of-config.patch
 Patch0184: 0184-efi-Print-an-error-if-boot-to-firmware-setup-is-not-.patch