linux-kernel - Re: [PATCH 2/3] fanotify: dont recalculate a marks mask if only the ignored mask changed

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Message-ID: <20141201091149.GC16185@quack.suse.cz>
Date:	Mon, 1 Dec 2014 10:11:49 +0100
From:	Jan Kara <jack@...e.cz>
To:	Lino Sanfilippo <LinoSanfilippo@....de>
Cc:	eparis@...hat.com, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, jack@...e.cz
Subject: Re: [PATCH 2/3] fanotify: dont recalculate a marks mask if only the
 ignored mask changed

On Sun 30-11-14 00:37:37, Lino Sanfilippo wrote:
> If removing bits from a marks ignored mask, the concerning inodes/vfsmounts
> mask is not affected. So dont recalculate it.
> 
> Signed-off-by: Lino Sanfilippo <LinoSanfilippo@....de>
  Looks good. You can add:
Reviewed-by: Jan Kara <jack@...e.cz>

								Honza
> ---
>  fs/notify/fanotify/fanotify_user.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/fs/notify/fanotify/fanotify_user.c b/fs/notify/fanotify/fanotify_user.c
> index 03a0dd1..3afd8bb 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -487,7 +487,7 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
>  					    unsigned int flags,
>  					    int *destroy)
>  {
> -	__u32 oldmask;
> +	__u32 oldmask = 0;
>  	__u32 new_mask;
>  	__u32 new_ignored;
>  
> @@ -496,8 +496,8 @@ static __u32 fanotify_mark_remove_from_mask(struct fsnotify_mark *fsn_mark,
>  		oldmask = fsn_mark->mask;
>  		fsnotify_set_mark_mask_locked(fsn_mark, (oldmask & ~mask));
>  	} else {
> -		oldmask = fsn_mark->ignored_mask;
> -		fsnotify_set_mark_ignored_mask_locked(fsn_mark, (oldmask & ~mask));
> +		__u32 tmask = fsn_mark->ignored_mask & ~mask;
> +		fsnotify_set_mark_ignored_mask_locked(fsn_mark, tmask);
>  	}
>  	new_mask = fsn_mark->mask;
>  	new_ignored = fsn_mark->ignored_mask;
> -- 
> 1.9.1
> 
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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