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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>
(cherry picked from commit 9c25f1b51e)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Jens Maus
committed by
Peter Korsgaard
Peter Korsgaard
parent
7704baa480
commit
52369b5b7a
@@ -0,0 +1,61 @@
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From 7fd5feff97c4b1f446f8fcf6d37aca0c64e7c763 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 21:36:16 +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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changing the UUID on a mounted metdata_csum filesystem without having
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to rewrite all the disk metadata. However, the GRUB doesn't use the
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metadata checksum at all. So, it can just ignore this feature if it
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is enabled. This is consistent with the GRUB filesystem code in general
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which just does a best effort to access the filesystem's data.
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The checksum seed incompat feature has to be removed from the ignore
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list if the support for metadata checksum verification is added to the
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GRUB ext2 driver later.
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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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Reviewed-by: Lukas Czerner <lczerner@redhat.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Upstream: 7fd5feff97c4b1f446f8fcf6d37aca0c64e7c763
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Signed-off-by: Jens Maus <mail@jens-maus.de>
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---
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grub-core/fs/ext2.c | 10 ++++++++--
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1 file changed, 8 insertions(+), 2 deletions(-)
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diff --git a/grub-core/fs/ext2.c b/grub-core/fs/ext2.c
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index e7dd78e66..4953a1591 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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@@ -123,10 +124,15 @@ 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. However, it
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+ * has to be removed from this list if the support is added later.
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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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-
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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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--
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2.34.1
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@@ -0,0 +1,60 @@
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From 2e9fa73a040462b81bfbfe56c0bc7ad2d30b446b Mon Sep 17 00:00:00 2001
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From: Theodore Ts'o <tytso@mit.edu>
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Date: Tue, 30 Aug 2022 22:41:59 -0400
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Subject: [PATCH] fs/ext2: Ignore the large_dir incompat feature
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Recently, ext4 added the large_dir feature, which adds support for
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a 3 level htree directory support.
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The GRUB supports existing file systems with htree directories by
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ignoring their existence, and since the index nodes for the hash tree
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look like deleted directory entries (by design), the GRUB can simply do
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a brute force O(n) linear search of directories. The same is true for
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3 level deep htrees indicated by large_dir feature flag.
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Hence, it is safe for the GRUB to ignore the large_dir incompat feature.
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Fixes: https://savannah.gnu.org/bugs/?61606
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Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Upstream: 2e9fa73a040462b81bfbfe56c0bc7ad2d30b446b
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Signed-off-by: Jens Maus <mail@jens-maus.de>
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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 0989e26e1..e1cc5e62a 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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@@ -104,6 +104,7 @@ GRUB_MOD_LICENSE ("GPLv3+");
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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_LARGEDIR 0x4000 /* >2GB or 3 level htree */
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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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@@ -129,10 +130,17 @@ GRUB_MOD_LICENSE ("GPLv3+");
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* checksummed filesystem. Safe to ignore for now since the
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* driver doesn't support checksum verification. However, it
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* has to be removed from this list if the support is added later.
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+ * large_dir: Not back-incompatible given that the GRUB ext2 driver does
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+ * not implement EXT2_FEATURE_COMPAT_DIR_INDEX. If the GRUB
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+ * eventually supports the htree feature (aka dir_index)
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+ * it should support 3 level htrees and then move
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+ * EXT4_FEATURE_INCOMPAT_LARGEDIR to
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+ * EXT2_DRIVER_SUPPORTED_INCOMPAT.
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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_CSUM_SEED)
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+ | EXT4_FEATURE_INCOMPAT_CSUM_SEED \
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+ | EXT4_FEATURE_INCOMPAT_LARGEDIR)
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#define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U
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--
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2.34.1
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