U-Boot doesn't support metadata_csum feature. Writing to filesystem with metadata_csum feature makes the filesystem corrupted and unbootable by Linux:
[ 2.527495] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 0 failed (52188!=0) [ 2.537421] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 1 failed (5262!=0) ... [ 2.653308] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 14 failed (42611!=0) [ 2.662179] EXT4-fs (mmcblk0p2): ext4_check_descriptors: Checksum for group 15 failed (21527!=0) [ 2.687920] JBD2: journal checksum error [ 2.691982] EXT4-fs (mmcblk0p2): error loading journal [ 2.698292] VFS: Cannot open root device "mmcblk0p2" or unknown-block(179,2): error -74
Don't write to filesystem with meatadata_csum feature to not corrupt the filesystem.
Signed-off-by: Sébastien Szymanski sebastien.szymanski@armadeus.com --- fs/ext4/ext4_write.c | 6 ++++++ include/ext4fs.h | 1 + 2 files changed, 7 insertions(+)
diff --git a/fs/ext4/ext4_write.c b/fs/ext4/ext4_write.c index a7f543f7df..4eb77c327e 100644 --- a/fs/ext4/ext4_write.c +++ b/fs/ext4/ext4_write.c @@ -864,6 +864,12 @@ int ext4fs_write(const char *fname, unsigned char *buffer, printf("error in File System init\n"); return -1; } + + if (le32_to_cpu(fs->sb->feature_ro_compat) & EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) { + printf("Unsupported feature metadata_csum found, not writing.\n"); + return -1; + } + inodes_per_block = fs->blksz / fs->inodesz; parent_inodeno = ext4fs_get_parent_inode_num(fname, filename, F_FILE); if (parent_inodeno == -1) diff --git a/include/ext4fs.h b/include/ext4fs.h index bb55639107..2421011341 100644 --- a/include/ext4fs.h +++ b/include/ext4fs.h @@ -32,6 +32,7 @@ #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_METADATA_CSUM 0x0400 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 #define EXT4_INDIRECT_BLOCKS 12