Re: Kernel bugzilla 198569: fanotify_mark() and FAN_Q_OVERFLOW

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Hi Michael!

On Thu 23-04-20 12:36:26, Michael Kerrisk (man-pages) wrote:
> Would you be able to take a look at
> https://bugzilla.kernel.org/show_bug.cgi?id=198569
> 
> It relates to some text you added to the fanotify_mark(2) manual page:
> 
>        FAN_Q_OVERFLOW
>               Create an event when an overflow of the event queue occurs.
>               The size of the event queue is limited to 16384 entries  if
>               FAN_UNLIMITED_QUEUE is not set in fanotify_init(2).
> 
> This was in the following commit
> 
> [[
> commit 5d730f864a6603b090cd1078668cede05d02b8c4
> Author: Heinrich Schuchardt <xypron.glpk@xxxxxx>
> Date:   Tue Nov 8 23:13:38 2016 +0100
> 
>     fanotify_mark.2: Mention FAN_Q_OVERFLOW
> 
>     To receive overflow events it is necessary to set this bit
>     in fanotify_mark().
> ]]
> 
> As far as I can see, FAN_Q_OVERFLOW (test program, reading the kernel
> source) is only an output flag. But on the other hand, I know you are
> generally careful, so I wonder if something changed (though, at a
> quick glance, I could not see evidence that it has).

Yeah, the manpage is wrong AFAICT. FAN_Q_OVERFLOW is not accepted in the
input mask. It is only output event flag.

								Honza

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



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