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ext4: Improve feature checking

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Evaluate the filesystem incompat and ro_compat bit fields to judge
whether the filesystem can be read or written.
For the read side only a scary warning is shown so far.
I'd love to abort mounting too, but I fear this will break some setups
where the driver works by chance.

Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Richard Weinberger
2024-07-29 23:37:31 +02:00
committed by Tom Rini
parent 37dc8c2e98
commit faf73fb70d
3 changed files with 76 additions and 3 deletions
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53
include/ext4fs.h
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@@ -34,12 +34,63 @@ struct disk_partition;
#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
#define EXT4_EXT_MAGIC 0xf30a
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
#define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
#define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
#define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
#define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
#define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
#define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
#define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
#define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
#define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
#define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
#define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004
#define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040
#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
#define EXT4_INDIRECT_BLOCKS 12
/*
* Incompat features supported by this implementation.
*/
#define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE | \
EXT4_FEATURE_INCOMPAT_RECOVER | \
EXT4_FEATURE_INCOMPAT_EXTENTS | \
EXT4_FEATURE_INCOMPAT_64BIT | \
EXT4_FEATURE_INCOMPAT_FLEX_BG)
/*
* Incompat features supported by this implementation only in a lazy
* way, good enough for reading files.
*
* - Multi mount protection (mmp) is not supported, but for read-only
* we get away with it.
* - Same for metadata_csum_seed and metadata_csum.
* - The implementation has also no clue about fscrypt, but it can read
* unencrypted files. Reading encrypted files will read garbage.
*/
#define EXT4_FEATURE_INCOMPAT_SUPP_LAZY_RO (EXT4_FEATURE_INCOMPAT_MMP | \
EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
EXT4_FEATURE_INCOMPAT_ENCRYPT)
/*
* Read-only compat features we support.
* If unknown ro compat features are detected, writing to the fs is denied.
*/
#define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER | \
EXT4_FEATURE_RO_COMPAT_LARGE_FILE | \
EXT4_FEATURE_RO_COMPAT_HUGE_FILE | \
EXT4_FEATURE_RO_COMPAT_GDT_CSUM | \
EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE)
#define EXT4_BG_INODE_UNINIT 0x0001
#define EXT4_BG_BLOCK_UNINIT 0x0002
#define EXT4_BG_INODE_ZEROED 0x0004