[PATCH 0/2] More fsnotify hook optimizations

[Amir Goldstein <amir73il@gmail.com>]

Jan,

Even since we did the FMODE_NONOTIFY optimization, it really bothered me
that we do not optimize out FAN_ACCESS_PERM, which I consider to be
unused baggage of the legacy API.

I finally figured out a way to get rid of this unneeded overhead of
all the read APIs.

Along the way, also added a trivial optimization for non-applicable
FAN_ACCESS_PERM on readdir and prepared the code towards adding
pre-dir-content events.

This passes the LTP tests, but please take a good look to see if I
missed anything.

Thanks,
Amir.

Amir Goldstein (2):
  fsnotify: merge file_set_fsnotify_mode_from_watchers() with open perm
    hook
  fsnotify: optimize FMODE_NONOTIFY_PERM for the common cases

 fs/file_table.c                  |  2 +-
 fs/notify/fsnotify.c             | 97 +++++++++++++++++++++-----------
 fs/open.c                        |  6 +-
 include/linux/fs.h               |  6 +-
 include/linux/fsnotify.h         | 35 ++----------
 include/linux/fsnotify_backend.h |  6 +-
 6 files changed, 80 insertions(+), 72 deletions(-)

-- 
2.43.0