linux-ext4 - Re: [PATCH v2 06/14] fsnotify: Add helper to detect overflow

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Date:   Wed, 16 Jun 2021 12:23:24 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     kernel@...labora.com, "Darrick J. Wong" <djwong@...nel.org>,
        Theodore Tso <tytso@....edu>,
        Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.com>,
        David Howells <dhowells@...hat.com>,
        Khazhismel Kumykov <khazhy@...gle.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v2 06/14] fsnotify: Add helper to detect overflow_event

On Wed, Jun 16, 2021 at 2:56 AM Gabriel Krisman Bertazi
<krisman@...labora.com> wrote:
>
> Similarly to fanotify_is_perm_event and friends, provide a helper
> predicate to say whether a mask is of an overflow event.
>
> Suggested-by: Amir Goldstein <amir73il@...il.com>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
> ---

Reviewed-by: Amir Goldstein <amir73il@...il.com>

Thanks!

>  fs/notify/fanotify/fanotify.h    | 3 ++-
>  include/linux/fsnotify_backend.h | 5 +++++
>  2 files changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/fs/notify/fanotify/fanotify.h b/fs/notify/fanotify/fanotify.h
> index aec05e21d5a9..7e00c05a979a 100644
> --- a/fs/notify/fanotify/fanotify.h
> +++ b/fs/notify/fanotify/fanotify.h
> @@ -326,7 +326,8 @@ static inline struct path *fanotify_event_path(struct fanotify_event *event)
>   */
>  static inline bool fanotify_is_hashed_event(u32 mask)
>  {
> -       return !fanotify_is_perm_event(mask) && !(mask & FS_Q_OVERFLOW);
> +       return !(fanotify_is_perm_event(mask) ||
> +                fsnotify_is_overflow_event(mask));
>  }
>
>  static inline unsigned int fanotify_event_hash_bucket(
> diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
> index c4473b467c28..f9e2c6cd0f7d 100644
> --- a/include/linux/fsnotify_backend.h
> +++ b/include/linux/fsnotify_backend.h
> @@ -495,6 +495,11 @@ static inline void fsnotify_queue_overflow(struct fsnotify_group *group)
>         fsnotify_add_event(group, group->overflow_event, NULL, NULL);
>  }
>
> +static inline bool fsnotify_is_overflow_event(u32 mask)
> +{
> +       return mask & FS_Q_OVERFLOW;
> +}
> +
>  static inline bool fsnotify_notify_queue_is_empty(struct fsnotify_group *group)
>  {
>         assert_spin_locked(&group->notification_lock);
> --
> 2.31.0
>