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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Javier Martinez Canillas <javierm@redhat.com>
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Date: Fri, 11 Jun 2021 00:01:29 +0200
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Subject: [PATCH] fs/ext2: Ignore checksum seed incompat feature
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This incompat feature is used to denote that the filesystem stored its
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metadata checksum seed in the superblock. This is used to allow tune2fs
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to change the UUID on a mounted metadata_csum filesystem without having
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to rewrite all the disk metadata.
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But GRUB doesn't use the metadata checksum in anyway, so can just ignore
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this feature if is enabled. This is consistent with GRUB filesystem code
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in general which just does a best effort to access the filesystem's data.
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It may be removed from the ignored list in the future if supports to do
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metadata checksumming verification is added to the read-only FS driver.
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Suggested-by: Eric Sandeen <esandeen@redhat.com>
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Suggested-by: Lukas Czerner <lczerner@redhat.com>
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Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
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---
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grub-core/fs/ext2.c | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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diff --git a/grub-core/fs/ext2.c b/grub-core/fs/ext2.c
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index e7dd78e6635..731d346f886 100644
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--- a/grub-core/fs/ext2.c
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+++ b/grub-core/fs/ext2.c
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@@ -103,6 +103,7 @@ GRUB_MOD_LICENSE ("GPLv3+");
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#define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
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#define EXT4_FEATURE_INCOMPAT_MMP 0x0100
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#define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
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+#define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
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#define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
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/* The set of back-incompatible features this driver DOES support. Add (OR)
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@@ -123,9 +124,16 @@ GRUB_MOD_LICENSE ("GPLv3+");
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* mmp: Not really back-incompatible - was added as such to
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* avoid multiple read-write mounts. Safe to ignore for this
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* RO driver.
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+ * checksum seed: Not really back-incompatible - was added to allow tools
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+ * such as tune2fs to change the UUID on a mounted metadata
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+ * checksummed filesystem. Safe to ignore for now since the
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+ * driver doesn't support checksum verification. But it must
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+ * be removed from this list if that support is added later.
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+ *
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*/
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#define EXT2_DRIVER_IGNORED_INCOMPAT ( EXT3_FEATURE_INCOMPAT_RECOVER \
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- | EXT4_FEATURE_INCOMPAT_MMP)
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+ | EXT4_FEATURE_INCOMPAT_MMP \
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+ | EXT4_FEATURE_INCOMPAT_CSUM_SEED)
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#define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U
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