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Date:   Fri, 15 Oct 2021 08:40:53 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     Jan Kara <jack@...e.com>, "Darrick J. Wong" <djwong@...nel.org>,
        Theodore Tso <tytso@....edu>,
        David Howells <dhowells@...hat.com>,
        Khazhismel Kumykov <khazhy@...gle.com>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Ext4 <linux-ext4@...r.kernel.org>,
        Linux API <linux-api@...r.kernel.org>,
        Matthew Bobrowski <repnop@...gle.com>, kernel@...labora.com
Subject: Re: [PATCH v7 11/28] fsnotify: Pass group argument to free_event

On Fri, Oct 15, 2021 at 12:38 AM Gabriel Krisman Bertazi
<krisman@...labora.com> wrote:
>
> For group-wide mempool backed events, like FS_ERROR, the free_event
> callback will need to reference the group's mempool to free the memory.
> Wire that argument into the current callers.
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
Reviewed-by: Amir Goldstein <amir73il@...il.com>

> ---
>  fs/notify/fanotify/fanotify.c        | 3 ++-
>  fs/notify/group.c                    | 2 +-
>  fs/notify/inotify/inotify_fsnotify.c | 3 ++-
>  fs/notify/notification.c             | 2 +-
>  include/linux/fsnotify_backend.h     | 2 +-
>  5 files changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c
> index f82e20228999..c620b4f6fe12 100644
> --- a/fs/notify/fanotify/fanotify.c
> +++ b/fs/notify/fanotify/fanotify.c
> @@ -835,7 +835,8 @@ static void fanotify_free_name_event(struct fanotify_event *event)
>         kfree(FANOTIFY_NE(event));
>  }
>
> -static void fanotify_free_event(struct fsnotify_event *fsn_event)
> +static void fanotify_free_event(struct fsnotify_group *group,
> +                               struct fsnotify_event *fsn_event)
>  {
>         struct fanotify_event *event;
>
> diff --git a/fs/notify/group.c b/fs/notify/group.c
> index fb89c351295d..6a297efc4788 100644
> --- a/fs/notify/group.c
> +++ b/fs/notify/group.c
> @@ -88,7 +88,7 @@ void fsnotify_destroy_group(struct fsnotify_group *group)
>          * that deliberately ignores overflow events.
>          */
>         if (group->overflow_event)
> -               group->ops->free_event(group->overflow_event);
> +               group->ops->free_event(group, group->overflow_event);
>
>         fsnotify_put_group(group);
>  }
> diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
> index a96582cbfad1..d92d7b0adc9a 100644
> --- a/fs/notify/inotify/inotify_fsnotify.c
> +++ b/fs/notify/inotify/inotify_fsnotify.c
> @@ -177,7 +177,8 @@ static void inotify_free_group_priv(struct fsnotify_group *group)
>                 dec_inotify_instances(group->inotify_data.ucounts);
>  }
>
> -static void inotify_free_event(struct fsnotify_event *fsn_event)
> +static void inotify_free_event(struct fsnotify_group *group,
> +                              struct fsnotify_event *fsn_event)
>  {
>         kfree(INOTIFY_E(fsn_event));
>  }
> diff --git a/fs/notify/notification.c b/fs/notify/notification.c
> index 44bb10f50715..9022ae650cf8 100644
> --- a/fs/notify/notification.c
> +++ b/fs/notify/notification.c
> @@ -64,7 +64,7 @@ void fsnotify_destroy_event(struct fsnotify_group *group,
>                 WARN_ON(!list_empty(&event->list));
>                 spin_unlock(&group->notification_lock);
>         }
> -       group->ops->free_event(event);
> +       group->ops->free_event(group, event);
>  }
>
>  /*
> diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
> index 035438fe4a43..1e69e9fe45c9 100644
> --- a/include/linux/fsnotify_backend.h
> +++ b/include/linux/fsnotify_backend.h
> @@ -155,7 +155,7 @@ struct fsnotify_ops {
>                             const struct qstr *file_name, u32 cookie);
>         void (*free_group_priv)(struct fsnotify_group *group);
>         void (*freeing_mark)(struct fsnotify_mark *mark, struct fsnotify_group *group);
> -       void (*free_event)(struct fsnotify_event *event);
> +       void (*free_event)(struct fsnotify_group *group, struct fsnotify_event *event);
>         /* called on final put+free to free memory */
>         void (*free_mark)(struct fsnotify_mark *mark);
>  };
> --
> 2.33.0
>

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