linux-kernel - Re: [PATCH 1/2] fs: move struct linux

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Date:   Mon, 20 Sep 2021 12:06:33 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Gaelan Steele <gbs@...ishe.com>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        linux-man@...r.kernel.org,
        Michael Kerrisk <mtk.manpages@...il.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org
Subject: Re: [PATCH 1/2] fs: move struct linux_dirent into headers

On Mon, Sep 20, 2021 at 10:56:48AM +0100, Gaelan Steele wrote:
> Move the definition of linux_dirent to include/linux/dirent.h,
> where the newer linux_dirent64 already lives. This is done in
> preparation for moving both of these struct definitions into uapi/
> so userspace code doesn't need to duplicate them.
> 
> Signed-off-by: Gaelan Steele <gbs@...ishe.com>
> ---
>  fs/readdir.c           | 8 +-------
>  include/linux/dirent.h | 7 +++++++
>  2 files changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/fs/readdir.c b/fs/readdir.c
> index 09e8ed7d4161..51890aeafc53 100644
> --- a/fs/readdir.c
> +++ b/fs/readdir.c
> @@ -202,14 +202,8 @@ SYSCALL_DEFINE3(old_readdir, unsigned int, fd,
>  
>  /*
>   * New, all-improved, singing, dancing, iBCS2-compliant getdents()
> - * interface. 
> + * interface.
>   */
> -struct linux_dirent {
> -	unsigned long	d_ino;
> -	unsigned long	d_off;
> -	unsigned short	d_reclen;
> -	char		d_name[1];
> -};
>  
>  struct getdents_callback {
>  	struct dir_context ctx;
> diff --git a/include/linux/dirent.h b/include/linux/dirent.h
> index 99002220cd45..48e119dd3694 100644
> --- a/include/linux/dirent.h
> +++ b/include/linux/dirent.h
> @@ -2,6 +2,13 @@
>  #ifndef _LINUX_DIRENT_H
>  #define _LINUX_DIRENT_H
>  
> +struct linux_dirent {
> +	unsigned long	d_ino;
> +	unsigned long	d_off;
> +	unsigned short	d_reclen;
> +	char		d_name[1];

These are not valid user/kernel api types.  If you want them in
userspace, please use the correct ones (__u64, __u16, __u8, etc.)

thanks,

greg k-h