linux-kernel - [PATCH 0/5] kernfs: Remove reference counting for kernfs_open

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Date:   Thu, 28 Apr 2022 15:54:26 +1000
From:   Imran Khan <imran.f.khan@...cle.com>
To:     tj@...nel.org, viro@...iv.linux.org.uk, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 0/5] kernfs: Remove reference counting for kernfs_open_node.

This patchset contains subset of patches (after addressing review comments)
discussed at [1]. Since [1] is replacing multiple global locks and since
each of these locks can be removed independently, it was decided that we
should make these changes in parts i.e first get one set of optimizations
integrated and then work on top of those further.

The patches in this change set introduce following changes:

PATCH-1: Remove reference counting for kernfs_open_node.

PATCH-2: Make kernfs_open_node->attr.open RCU protected.

PATCH-3: Change kernfs_notify_list to llist.

PATCH-4: Introduce interface to access kernfs_open_file_mutex.

PATCH-5: Replace global kernfs_open_file_mutex with hashed mutexes.

-------------------------------------------------------------------------

Imran Khan (5):
  kernfs: Remove reference counting for kernfs_open_node.
  kernfs: make ->attr.open RCU protected.
  kernfs: Change kernfs_notify_list to llist.
  kernfs: Introduce interface to access global kernfs_open_file_mutex.
  kernfs: Replace global kernfs_open_file_mutex with hashed mutexes.

 fs/kernfs/file.c            | 247 ++++++++++++++++++++----------------
 fs/kernfs/kernfs-internal.h |   4 +
 fs/kernfs/mount.c           |  19 +++
 include/linux/kernfs.h      |  61 ++++++++-
 4 files changed, 223 insertions(+), 108 deletions(-)

base-commit: 088fb7eff3496e0f61fdf68bda89b81a4d0a4434

[1] https://lore.kernel.org/lkml/YmLfxHcekrr89IFl@slm.duckdns.org/
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