md: beginnings of bad block management.

This the first step in allowing md to track bad-blocks per-device so
that we can fail individual blocks rather than the whole device.

This patch just adds a data structure for recording bad blocks, with
routines to add, remove, search the list.

Signed-off-by: NeilBrown <[email protected]>
Reviewed-by: Namhyung Kim <[email protected]>

0 files changed, 0 insertions, 0 deletions