| It enable the metadata_csum_seed feature by default in e2fsprogs 1.47.0 and |
| causes grub doesn't work. Backport patch to make grub support this feature. |
| |
| Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=7fd5fef] |
| |
| Signed-off-by: Kai Kang <kai.kang@windriver.com> |
| |
| 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> |
| --- |
| 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 |
| |