linux-kernel - Re: [PATCH v2 3/3] splice: fsnotify_access(in), fsnotify

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Date:   Tue, 27 Jun 2023 09:20:09 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Ahelenia Ziemiańska 
        <nabijaczleweli@...ijaczleweli.xyz>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jan Kara <jack@...e.cz>,
        Chung-Chiang Cheng <cccheng@...ology.com>
Subject: Re: [PATCH v2 3/3] splice: fsnotify_access(in), fsnotify_modify(out)
 on success in tee

On Tue, Jun 27, 2023 at 2:09 AM Ahelenia Ziemiańska
<nabijaczleweli@...ijaczleweli.xyz> wrote:
>
> Same logic applies here: this can fill up the pipe, and pollers that rely
> on getting IN_MODIFY notifications never wake up.
>
> Fixes: 983652c69199 ("splice: report related fsnotify events")
> Link: https://lore.kernel.org/linux-fsdevel/jbyihkyk5dtaohdwjyivambb2gffyjs3dodpofafnkkunxq7bu@jngkdxx65pux/t/#u
> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@...ijaczleweli.xyz>

Makes sense.

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

> ---
>  fs/splice.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/fs/splice.c b/fs/splice.c
> index a18274209dc1..3234aaa6e957 100644
> --- a/fs/splice.c
> +++ b/fs/splice.c
> @@ -1819,6 +1819,11 @@ long do_tee(struct file *in, struct file *out, size_t len, unsigned int flags)
>                 }
>         }
>
> +       if (ret > 0) {
> +               fsnotify_access(in);
> +               fsnotify_modify(out);
> +       }
> +
>         return ret;
>  }
>
> --
> 2.39.2