[PATCH 0/8 v3] scope GFP_NOFS api

[Michal Hocko]

Hi,
I have posted the previous version here [1]. Since then I've added some
reviewed bys and fixed some minor issues. I've dropped patch 2 [2] based
on Dave's request [3]. I agree that this can be done later and doing
all at once. I still think that __GFP_NOLOCKDEP should be added by this
series to make the further development easier.

There didn't seem to be any real objections and so I think we should go
and merge this and build further on top. I would like to get rid of all
explicit GFP_NOFS usage in ext4 code. I have something half baked already
and will send it later on. I also hope we can get further with the xfs
as well.

I haven't heard anything from btrfs or other filesystems guys which is a
bit unfortunate but I do not want to wait for them to much longer, they
can join the effort later on.

The patchset is based on next-20170106

Diffstat says
 fs/ext4/acl.c             |  6 +++---
 fs/ext4/extents.c         |  8 ++++----
 fs/ext4/resize.c          |  4 ++--
 fs/ext4/xattr.c           |  4 ++--
 fs/jbd2/journal.c         |  7 +++++++
 fs/jbd2/transaction.c     | 11 +++++++++++
 fs/xfs/kmem.c             | 10 +++++-----
 fs/xfs/kmem.h             |  2 +-
 fs/xfs/libxfs/xfs_btree.c |  2 +-
 fs/xfs/xfs_aops.c         |  6 +++---
 fs/xfs/xfs_buf.c          |  8 ++++----
 fs/xfs/xfs_trans.c        | 12 ++++++------
 include/linux/gfp.h       | 18 +++++++++++++++++-
 include/linux/jbd2.h      |  2 ++
 include/linux/sched.h     | 32 ++++++++++++++++++++++++++------
 kernel/locking/lockdep.c  |  6 +++++-
 lib/radix-tree.c          |  2 ++
 mm/page_alloc.c           |  8 +++++---
 mm/vmscan.c               |  6 +++---
 19 files changed, 109 insertions(+), 45 deletions(-)

Shortlog:
Michal Hocko (8):
      lockdep: allow to disable reclaim lockup detection
      xfs: abstract PF_FSTRANS to PF_MEMALLOC_NOFS
      mm: introduce memalloc_nofs_{save,restore} API
      xfs: use memalloc_nofs_{save,restore} instead of memalloc_noio*
      jbd2: mark the transaction context with the scope GFP_NOFS context
      jbd2: make the whole kjournald2 kthread NOFS safe
      Revert "ext4: avoid deadlocks in the writeback path by using sb_getblk_gfp"
      Revert "ext4: fix wrong gfp type under transaction"

[1] http://lkml.kernel.org/r/20161215140715.12732-1-mhocko@kernel.org
[2] http://lkml.kernel.org/r/20161215140715.12732-3-mhocko@kernel.org
[3] http://lkml.kernel.org/r/20161219212413.GN4326@dastard