43 lines
2.4 KiB
C
43 lines
2.4 KiB
C
--- grub-core/fs/ext2.c
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+++ grub-core/fs/ext2.c
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@@ -100,7 +100,10 @@ GRUB_MOD_LICENSE ("GPLv3+");
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#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
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#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* Extents used */
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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_LARGEDIR 0x4000 /* >2GB or 3 level htree */
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/* The set of back-incompatible features this driver DOES support. Add (OR)
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* flags here as the related features are implemented into the driver. */
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@@ -114,8 +117,26 @@ GRUB_MOD_LICENSE ("GPLv3+");
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* journal because they will ignore the journal, but the next
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* ext3 driver to mount the volume will find the journal and
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* replay it, potentially corrupting the metadata written by
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- * the ext2 drivers. Safe to ignore for this RO driver. */
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-#define EXT2_DRIVER_IGNORED_INCOMPAT ( EXT3_FEATURE_INCOMPAT_RECOVER )
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+ * the ext2 drivers. Safe to ignore for this RO driver.
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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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+ * 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_LARGEDIR)
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#define EXT3_JOURNAL_MAGIC_NUMBER 0xc03b3998U
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