mbox series

[v5,00/22] fanotify events with name info

Message ID 20200716084230.30611-1-amir73il@gmail.com
Headers show
Series fanotify events with name info | expand

Message

Amir Goldstein July 16, 2020, 8:42 a.m. UTC
Hi Jan,

This patch set implements the FAN_REPORT_NAME and FAN_REPORT_DIR_FID
group flags.

I previously posted v3 of prep patch series [1] and v4 of follow up
series [2].  Since then you pick up several prep patches, so this
posting includes the rest of the prep patches along with the followup
patches with most of your comments addressed.

Regarding the use of flag FS_EVENT_ON_CHILD and the TYPE_CHILD mark
iterator, I did not change that because I was not sure about it and it
is an internal implementation detail that we can change later.
But the discussion about it made me realize that dnotify event handler
wasn't properly adapted, so I added a patch to fix it.

The patches are available on github [3] based on your fsnotify branch.
man-pages [4] LTP tests [5] and a demo [6] are also available.

Thanks,
Amir.

Changes since v4 (and since prep series v3):
- Some prep patches already picked up - the rest are included here
- Parcel variable event info according to your suggestions
- Separate unrelated change from FAN_MOVE_SELF patch
- Add adaptation of dnotify to unified event on parent/child
- Re-structure fsnotify_parent() based on your review comments

[1] https://lore.kernel.org/linux-fsdevel/20200708111156.24659-21-amir73il@gmail.com/
[2] https://lore.kernel.org/linux-fsdevel/20200702125744.10535-1-amir73il@gmail.com/
[3] https://github.com/amir73il/man-pages/commits/fanotify_name_fid-v5
[4] https://github.com/amir73il/linux/commits/fanotify_name_fid
[5] https://github.com/amir73il/ltp/commits/fanotify_name_fid
[6] https://github.com/amir73il/inotify-tools/commits/fanotify_name


*** BLURB HERE ***

Amir Goldstein (22):
  fanotify: generalize the handling of extra event flags
  fanotify: generalize merge logic of events on dir
  fanotify: distinguish between fid encode error and null fid
  fanotify: generalize test for FAN_REPORT_FID
  fanotify: mask out special event flags from ignored mask
  fanotify: prepare for implicit event flags in mark mask
  fanotify: use FAN_EVENT_ON_CHILD as implicit flag on sb/mount/non-dir
    marks
  fsnotify: add object type "child" to object type iterator
  fanotify: use struct fanotify_info to parcel the variable size buffer
  fanotify: no external fh buffer in fanotify_name_event
  dnotify: report both events on parent and child with single callback
  inotify: report both events on parent and child with single callback
  fanotify: report both events on parent and child with single callback
  fsnotify: send event to parent and child with single callback
  fsnotify: send event with parent/name info to sb/mount/non-dir marks
  fsnotify: remove check that source dentry is positive
  fsnotify: send MOVE_SELF event with parent/name info
  fanotify: add basic support for FAN_REPORT_DIR_FID
  fanotify: report events with parent dir fid to sb/mount/non-dir marks
  fanotify: add support for FAN_REPORT_NAME
  fanotify: report parent fid + name + child fid
  fanotify: report parent fid + child fid

 fs/kernfs/file.c                     |  10 +-
 fs/notify/dnotify/dnotify.c          |  42 +++--
 fs/notify/fanotify/fanotify.c        | 273 ++++++++++++++++++++-------
 fs/notify/fanotify/fanotify.h        | 103 ++++++++--
 fs/notify/fanotify/fanotify_user.c   | 192 ++++++++++++++-----
 fs/notify/fsnotify.c                 | 132 +++++++++----
 fs/notify/inotify/inotify_fsnotify.c |  44 ++++-
 include/linux/fanotify.h             |   6 +-
 include/linux/fsnotify.h             |  15 +-
 include/linux/fsnotify_backend.h     |  35 +++-
 include/uapi/linux/fanotify.h        |  15 +-
 11 files changed, 662 insertions(+), 205 deletions(-)

Comments

Jan Kara July 16, 2020, 5:13 p.m. UTC | #1
Hi Amir!

On Thu 16-07-20 11:42:08, Amir Goldstein wrote:
> This patch set implements the FAN_REPORT_NAME and FAN_REPORT_DIR_FID
> group flags.
> 
> I previously posted v3 of prep patch series [1] and v4 of follow up
> series [2].  Since then you pick up several prep patches, so this
> posting includes the rest of the prep patches along with the followup
> patches with most of your comments addressed.
> 
> Regarding the use of flag FS_EVENT_ON_CHILD and the TYPE_CHILD mark
> iterator, I did not change that because I was not sure about it and it
> is an internal implementation detail that we can change later.
> But the discussion about it made me realize that dnotify event handler
> wasn't properly adapted, so I added a patch to fix it.
> 
> The patches are available on github [3] based on your fsnotify branch.
> man-pages [4] LTP tests [5] and a demo [6] are also available.

Phew! So I went through the patches. I didn't find any bug besides couple
of typos I've fixed and then couple of things I've flagged at individual
patches (which I've fixed up locally as well). There's just that
ignore_mask handling issue outstanding. Overall I have to say I'm unhappy
about the complexity of juggling with dir/inode/child, dirfh vs objfh, etc.
I acknowledge that the stuff is at least well commented so I was able to
grok it but still... That being said I don't have a great idea how to
simplify all this so at this point I'm ok with merging things as they are
but once all the functionality is in I want to have a look at how to
simplify all the special cases.

Anyway, for now, thanks for your persistence and work when developing this
series!

								Honza