[dm-devel] fix delayed holder tracking

[Christoph Hellwig]

Hi all,

this series tries to fix the delayed holder tracking that is only used by
dm by moving it into dm, where we can track the lifetimes much better.

Diffstat:
 block/genhd.c          |    8 +--
 block/holder.c         |   40 ++++------------
 drivers/md/dm.c        |  122 ++++++++++++++++++++++++++-----------------------
 include/linux/blkdev.h |    5 --
 4 files changed, 80 insertions(+), 95 deletions(-)