linux-ext4 - Re: [PATCH v8 23/32] fanotify: Wrap object

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Date:   Tue, 19 Oct 2021 15:58:36 +0200
From:   Jan Kara <jack@...e.cz>
To:     Gabriel Krisman Bertazi <krisman@...labora.com>
Cc:     jack@...e.com, amir73il@...il.com, djwong@...nel.org,
        tytso@....edu, david@...morbit.com, dhowells@...hat.com,
        khazhy@...gle.com, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-api@...r.kernel.org,
        kernel@...labora.com, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH v8 23/32] fanotify: Wrap object_fh inline space in a
 creator macro

On Mon 18-10-21 21:00:06, Gabriel Krisman Bertazi wrote:
> fanotify_error_event would duplicate this sequence of declarations that
> already exist elsewhere with a slight different size.  Create a helper
> macro to avoid code duplication.
> 
> Suggested-by: Jan Kara <jack@...e.cz>
> Signed-off-by: Gabriel Krisman Bertazi <krisman@...labora.com>
> 
> ---
> Among the suggestions, I think this is simpler because it avoids
> deep nesting the variable-sized attribute, which would have been hidden
> inside fee->ffe->object_fh.buf.

One nit from me as well :)

> +#define FANOTIFY_INLINE_FH(size)					\
> +struct {								\
> +	struct fanotify_fh object_fh;					\
> +	/* Space for object_fh.buf[] - access with fanotify_fh_buf() */	\
> +	unsigned char _inline_fh_buf[(size)];				\
> +}
> +

Can the macro perhaps take the name of the fanotify_fh member it creates?
Like:

#define FANOTIFY_INLINE_FH(name, size)

Harcoding _inline_fh_buf is fine since it isn't ever used directly but
hardcoding object_fh looks ugly to me. With that improved feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR