kumquat-buildroot/boot/grub2/0019-fs-ext2-Ignore-checksum-seed-incompat-feature.patch
Jens Maus 9c25f1b51e boot/grub2: fix incompat e2fsprogs feature use
With bump of package/e2fsprogs to 1.47.0 [1] a freshly generated
ext4 fs has unfortunately different default features enabled
(e.g. metadata_csum_seed). This and some other newer fs features
(e.g. large_dir) are however not supported by our grub2.
Thus, newly generated ext-based rootfs won't be recognized by grub2
and are therefore not bootable/usable from grub2 anymore. This is
an issue already known to other Linux derivates [2],[3],[4].

This commit introduces two additional upstream patches to
package/grub2 which adds EXT4_FEATURE_INCOMPAT_CSUM_SEED and
EXT4_FEATURE_INCOMPAT_LARGEDIR to the EXT2_DRIVER_IGNORED_INCOMPAT
list of ignored incompatible ext features, allowing grub2 to
use ext filesystems with these newer default feature sets.

[1] https://git.buildroot.net/buildroot/commit/?id=6a21733f839478d902f3eab287a82b456e55f708
[2] https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1844012
[3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1031325
[4] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1030939

Signed-off-by: Jens Maus <mail@jens-maus.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2023-09-30 11:59:31 +02:00

62 lines
2.7 KiB
Diff

From 7fd5feff97c4b1f446f8fcf6d37aca0c64e7c763 Mon Sep 17 00:00:00 2001
From: Javier Martinez Canillas <javierm@redhat.com>
Date: Fri, 11 Jun 2021 21:36:16 +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
changing the UUID on a mounted metdata_csum filesystem without having
to rewrite all the disk metadata. However, the GRUB doesn't use the
metadata checksum at all. So, it can just ignore this feature if it
is enabled. This is consistent with the GRUB filesystem code in general
which just does a best effort to access the filesystem's data.
The checksum seed incompat feature has to be removed from the ignore
list if the support for metadata checksum verification is added to the
GRUB ext2 driver later.
Suggested-by: Eric Sandeen <esandeen@redhat.com>
Suggested-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Upstream: 7fd5feff97c4b1f446f8fcf6d37aca0c64e7c763
Signed-off-by: Jens Maus <mail@jens-maus.de>
---
grub-core/fs/ext2.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/grub-core/fs/ext2.c b/grub-core/fs/ext2.c
index e7dd78e66..4953a1591 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)
@@ -123,10 +124,15 @@ 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. However, it
+ * has to be removed from this list if the 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
--
2.34.1