On 6/15/23 08:48, Christoph Hellwig wrote:

The support for write intent bitmaps in files on an external files in md
is a hot mess that abuses ->bmap to map file offsets into physical device
objects, and also abuses buffer_heads in a creative way.

Make this code optional so that MD can be built into future kernels
without buffer_head support, and so that we can eventually deprecate it.

Note this does not affect the internal bitmap support, which has none of
the problems.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
  drivers/md/Kconfig     | 10 ++++++++++
  drivers/md/md-bitmap.c | 15 +++++++++++++++
  drivers/md/md.c        |  7 +++++++
  3 files changed, 32 insertions(+)

Reviewed-by: Hannes Reinecke <hare@suse.de>

Cheers,

Hannes