Volatile fanotify marks

Jan,

Following RFC discussion [1], following are the volatile mark patches.

Tested both manually and with this LTP test [2].
I was struggling with this test for a while because drop caches
did not get rid of the un-pinned inode when test was run with
ext2 or ext4 on my test VM. With xfs, the test works fine for me,
but it may not work for everyone.

Perhaps you have a suggestion for a better way to test inode eviction.

Thanks,
Amir.

[1] https://lore.kernel.org/linux-fsdevel/CAOQ4uxiRDpuS=2uA6+...
[2] https://github.com/amir73il/ltp/commits/fan_volatile

Amir Goldstein (5):
  fsnotify: move inotify control flags to mark flags
  fsnotify: pass flags argument to fsnotify_add_mark()
  fsnotify: allow adding an inode mark without pinning inode
  fanotify: add support for exclusive create of mark
  fanotify: add support for "volatile" inode marks

 fs/notify/fanotify/fanotify_user.c   | 32 +++++++++--
 fs/notify/fsnotify.c                 |  4 +-
 fs/notify/inotify/inotify_fsnotify.c |  2 +-
 fs/notify/inotify/inotify_user.c     | 40 +++++++++-----
 fs/notify/mark.c                     | 83 +++++++++++++++++++++++-----
 include/linux/fanotify.h             |  9 ++-
 include/linux/fsnotify_backend.h     | 32 ++++++-----
 include/uapi/linux/fanotify.h        |  2 +
 kernel/audit_fsnotify.c              |  3 +-
 9 files changed, 151 insertions(+), 56 deletions(-)

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2.25.1