Re: [8/8] Fix fsnotify short comings (single fd with recursive notifications).

[DENIEL Philippe <philippe.deniel@cea.fr>]

On 04/08/13 12:45, Boaz Harrosh wrote:
> From: DENIEL Philippe <philippe.deniel@cea.fr>
>
> DENIEL Has reported that watching directories through the new fsnotify API,
> might miss some events like deletes and that a directory watch is not recursive, which
> means that we need to open two fd(s) for each directory in the cache. (Which halves our
> fd cache size).
>
> Again from the top of my head, and I know nothing of this subject.
>
> DENIEL please add any information here, so we can talk about it at LSF.
>
What I have seen was this:
     - if dnotify() is used, it gets every events. If used on a 
directory, it will get every creation and deletion. But it is not 
recursive, so we need to use dnotify on every inode we manage.
     - if fanotify is used, it is recursive and by using it on the root 
of a filesystem, then you have events from the whole underlying tree. 
The trouble is that deletion seem not to be caught.

I do have tests written in C for that.

     regards

         Philippe