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- 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
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