Indentation should be done with spaces, not with TABs, in the block subsystem
There are still a lot of old files in the QEMU block code base that use TABs for indentation instead of using 4 spaces in these files here:
include/hw/block/flash.h include/hw/ide/internal.h include/block/nbd.h hw/ide/cmd646.c hw/ide/core.c hw/ide/microdrive.c block/bochs.c block/qcow.c block/file-posix.c block/file-win32.c block/parallels.c hw/block/nand.c hw/block/onenand.c hw/block/tc58128.c hw/block/fdc.c
The TABs should be replaced by 4 spaces to make sure that we have a consistent coding style everywhere.