Function write_primary_superblock() has two ways to flush superblock, byte-by-byte as default. It may use io_channel_write_byte() many times. If some errors occur during these funcs, the superblock may become inconsistent and produce checksum error. Try write_primary_superblock() with whole-block way again when it failed on byte-by-byte way. --- lib/ext2fs/closefs.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/lib/ext2fs/closefs.c b/lib/ext2fs/closefs.c index 69cbdd8c..1fc27fb5 100644 --- a/lib/ext2fs/closefs.c +++ b/lib/ext2fs/closefs.c @@ -223,10 +223,8 @@ static errcode_t write_primary_superblock(ext2_filsys fs, retval = io_channel_write_byte(fs->io, SUPERBLOCK_OFFSET + (2 * write_idx), size, new_super + write_idx); - if (retval == EXT2_ET_UNIMPLEMENTED) - goto fallback; if (retval) - return retval; + goto fallback; } memcpy(fs->orig_super, super, SUPERBLOCK_SIZE); return 0; -- 2.23.0
