[PATCH v2 0/7] vfs: Use dlock list for SB's s_inodes list

[Waiman Long]

v1->v2:
 - Add a set of simple per-subnode APIs that is between percpu and
   per-node in granularity.
 - Make dlock list to use the per-subnode APIs so as to reduce the
   total number of separate linked list that needs to be managed
   and iterated.
 - There is no change in patches 1-5.

This is a follow up of the following patchset:

  [PATCH v7 0/4] vfs: Use per-cpu list for SB's s_inodes list
  https://lkml.org/lkml/2016/4/12/1009

The main change is the renaming of percpu list to dlock list, as
suggested by Christoph Lameter. It also adds a new patch from Boqun
Feng to add the __percpu modifier for parameters.

Patch 1 introduces the dlock list.

Patch 2 adds the __percpu modifier to the appropriate parameters.

Patch 3 cleans up the fsnotify_unmount_inodes() function by making
the code simpler and more standard.

Patch 4 replaces the use of list_for_each_entry_safe() in
evict_inodes() and invalidate_inodes() by list_for_each_entry().

Patch 5 modifies the superblock and inode structures to use the dlock
list. The corresponding functions that reference those structures
are modified.

Patch 6 adds a new set of per-subnode APIs that allow distributed
resources with a granularity that is in between a per-cpu and per-node
systems.

Patch 7 modifies the dlock list to use the new per-subnode APIs so
that it will have less linked lists to manage and iterate compared
with the per-cpu version.

Boqun Feng (1):
  lib/dlock-list: Add __percpu modifier for parameters

Jan Kara (2):
  fsnotify: Simplify inode iteration on umount
  vfs: Remove unnecessary list_for_each_entry_safe() variants

Waiman Long (4):
  lib/dlock-list: Distributed and lock-protected lists
  vfs: Use dlock list for superblock's inode list
  lib/persubnode: Introducing a simple per-subnode APIs
  lib/dlock-list: Use the per-subnode APIs for managing lists

 fs/block_dev.c             |   13 ++-
 fs/drop_caches.c           |   10 +-
 fs/fs-writeback.c          |   13 ++-
 fs/inode.c                 |   40 +++-----
 fs/notify/inode_mark.c     |   53 +++--------
 fs/quota/dquot.c           |   16 ++--
 fs/super.c                 |    7 +-
 include/linux/dlock-list.h |  234 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/fs.h         |    8 +-
 include/linux/persubnode.h |   80 +++++++++++++++
 init/main.c                |    2 +
 lib/Makefile               |    4 +-
 lib/dlock-list.c           |  102 +++++++++++++++++++
 lib/persubnode.c           |  119 ++++++++++++++++++++++
 14 files changed, 605 insertions(+), 96 deletions(-)
 create mode 100644 include/linux/dlock-list.h
 create mode 100644 include/linux/persubnode.h
 create mode 100644 lib/dlock-list.c
 create mode 100644 lib/persubnode.c