Re: [PATCH v4 00/15] fanotify: add support for more event types

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On Mon 07-01-19 09:46:37, Amir Goldstein wrote:
> On Fri, Jan 4, 2019 at 1:00 PM Jan Kara <jack@xxxxxxx> wrote:
> > On Sun 02-12-18 13:38:11, Amir Goldstein wrote:
> > > This is the 4th revision of patch series to add support for filesystem
> > > change monitoring to fanotify.
> > > It incorporates the changes you requested in review of v3 FAN_REPORT_FID
> > > patches.
> > > The complete work is available on fanotify_dirent branch [1] on my tree.
> > >
> > > The combined functionality of FAN_MARK_FILESYSTEM, FAN_REPORT_FID and
> > > dirent modification events is demonstrated with a prototype of global
> > > filesystem monitor based on inotify-tools [2].
> > >
> > > In your review of v3 patched you only got as far as patch v3 9/13.
> > > Because this patch marks the end of the FAN_REPORT_FID sub series,
> > > I found it best to re-post the entire series with the changes you
> > > requested thus far. For convenience of review, I pushed branches
> > > fanotify_fid-v3 [3] and fanotify_fid-v4 [4] with the work you
> > > reviewed so far and its re-worked version.
> > >
> > > One thing that we discussed and I did NOT do is move struct file_handle
> > > to uapi headers. This got complicated due to existing definitions in
> > > glibc header files and I realized we could do without it.
> > >
> > > I have added the vfs_get_fsid() helper as you requested, but since it
> > > wasn't required by the patch set, I added it as two new cleanup patches
> > > at the end of the FAN_REPORT_FID series, so you will be able to stage
> > > the feature with or without the VFS change.
> >
> > So overall the series looks very good. I've had only some smaller comments
> > / disagreements. So once we settle those please resend the series and I'll
> > pick it up to my tree.
> >
> 
> Jan,
> 
> I addressed all your comments, rebased on v5.0-rc1 and pushed to:
> https://github.com/amir73il/linux/commits/fanotify_dirent
> 
> When I get an ACK from you on the FAN_ONDIR issue, I will post the v5 series.
> The gist is that FAN_ONDIR an input flag is required to produce mkdir/rmdir
> events (as you suggested) and FAN_ONDIR is reported as output flag
> for FAN_REPORT_FID group for all events that occur on directories
> and never reported to non FAN_REPORT_FID group.

Agreed. But thinking about it a bit more and looking at your patch on
Github I think your solution doesn't quite work in presence of event
merging since an event with FAN_ONDIR can get merged with event without
FAN_ONDIR, can't it? That seems to be generally a problem with
should_merge() for direntry events that it doesn't take ISDIR flag into
account...

								Honza
-- 
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR



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