Hi Jan, Amir - Thank you for quick respond! Yes with mount --bind /opt /opt and then adding ignore mask it works as expected. Regards, Nilesh -----Original Message----- From: Amir Goldstein <amir73il@xxxxxxxxx> Sent: Monday, March 23, 2020 6:34 PM To: Jan Kara <jack@xxxxxxx> Cc: Nilesh Awate <Nilesh.Awate@xxxxxxxxxxxxx>; linux-fsdevel <linux-fsdevel@xxxxxxxxxxxxxxx> Subject: [EXTERNAL] Re: Fanotify Ignore mask On Mon, Mar 23, 2020 at 1:57 PM Jan Kara <jack@xxxxxxx> wrote: > > > Hello Nilesh! > > On Sun 22-03-20 17:50:50, Nilesh Awate wrote: > > I'm new to Fanotify. I'm approaching you because I see that you have done great work in Fanotify subsystem. > > > > I've a trivial query. How can we ignore events from a directory, If we have mark "/" as mount. > > > > fd = fanotify_init(FAN_CLOEXEC | FAN_CLASS_CONTENT | FAN_NONBLOCK, > > O_RDONLY | O_LARGEFILE); > > > > ret = fanotify_mark(fd, FAN_MARK_ADD | FAN_MARK_MOUNT, FAN_OPEN_PERM | FAN_CLOSE_WRITE, > > AT_FDCWD, "/") ; > > > > Now I don't want events from "/opt" directory is it possible to ignore all events from /opt directory. > > > > I see examples from > > https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgi > > thub.com%2Flinux-test-project%2Fltp%2Fblob%2Fmaster%2Ftestcases%2Fke > > rnel%2Fsyscalls%2Ffanotify%2Ffanotify01.c&data=02%7C01%7CNilesh. > > Awate%40microsoft.com%7C6393ffac541a4e2ce0db08d7cf2aba87%7C72f988bf8 > > 6f141af91ab2d7cd011db47%7C1%7C0%7C637205655195489406&sdata=z8TmM > > 5yVBC5hd%2FegNkxu%2FVaTqJ9kTEoflyXdEmFo0nc%3D&reserved=0 > > But they all taking about a file. Could you pls help me here. > > There's no way how you could 'ignore' events in the whole directory, > let alone even the whole subtree under a directory which you seem to imply. > Ignore mask really only work for avoiding generating events from > individual files. Any more sophisticated filtering needs to happen in > userspace after getting the events from the kernel. There is no way so set an 'ignore' mask, but it is possible to use the fact that the mark is a 'mount' mark. By mounting a bind mount over /opt (mount -o bind /opt /opt) operations within the /opt subtree (if performed from this mount ns and with path lookup done after mounting the bind mount), will not generate events to the mount mark on /. Thanks, Amir.
