linux-ext4 - Re: [PATCH RFC 08/15] fsnotify: Introduce helpers to send error

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Date:   Tue, 27 Apr 2021 09:49:31 +0300
From:   Amir Goldstein <amir73il@...il.com>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     Theodore Tso <tytso@....edu>,
        "Darrick J. Wong" <djwong@...nel.org>,
        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>, kernel@...labora.com
Subject: Re: [PATCH RFC 08/15] fsnotify: Introduce helpers to send error_events

On Mon, Apr 26, 2021 at 9:42 PM Gabriel Krisman Bertazi
<krisman@...labora.com> wrote:
>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
> ---
>  include/linux/fsnotify.h | 15 +++++++++++++++
>  1 file changed, 15 insertions(+)
>
> diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
> index f8acddcf54fb..b3ac1a9d0d4d 100644
> --- a/include/linux/fsnotify.h
> +++ b/include/linux/fsnotify.h
> @@ -317,4 +317,19 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
>                 fsnotify_dentry(dentry, mask);
>  }
>
> +static inline void fsnotify_error_event(int error, struct inode *dir,
> +                                       const char *function, int line,
> +                                       void *fs_data, int fs_data_size)
> +{
> +       struct fs_error_report report = {
> +               .error = error,
> +               .line = line,
> +               .function = function,
> +               .fs_data_size = fs_data_size,
> +               .fs_data = fs_data,
> +       };
> +
> +       fsnotify(FS_ERROR, &report, FSNOTIFY_EVENT_ERROR, dir, NULL, NULL, 0);

The way you use this helper from ext4_fsnotify_error() it would make more sense
to name the inode argument 'inode' and call:

       fsnotify(FS_ERROR, &report, FSNOTIFY_EVENT_ERROR, NULL, NULL, inode, 0);

Also, if we stick with returning ENOMEM instead of overflow event (I
don't think we should),
then this helper should return the error as well.

Thanks,
Amir.