[PATCH 0/2] Split brain detection

[Kent Overstreet <kent.overstreet@linux.dev>]

Two patch series for split brain detection: that is, detect when
different members of a filesystem have been used, independently, in
degraded mode and diverged - when that happens we can no longer use
those members in combination.

First patch adds superblock facilities: we add a superblock sequence
number field to bch_member, and a write time field to the superblock to
detect cases when sb->seq is equal but they actually have diverged.

Second patch does the actual split brain detection and kicking out of
devices when necessary.

Kent Overstreet (2):
  bcachefs: bch_member->seq
  bcachefs: Split brain detection

 fs/bcachefs/bcachefs_format.h |  4 ++-
 fs/bcachefs/errcode.h         |  1 +
 fs/bcachefs/sb-members.c      |  5 ++++
 fs/bcachefs/super-io.c        | 10 +++++++
 fs/bcachefs/super.c           | 56 ++++++++++++++++++++++++++++-------
 5 files changed, 64 insertions(+), 12 deletions(-)

-- 
2.42.0