linux-kernel - Re: [PATCH 1/2] open: new O

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Message-Id: <57fe666f-f451-462f-8f16-8c0ba83f1eac@app.fastmail.com>
Date: Sun, 25 Jan 2026 15:40:03 +0100
From: "Arnd Bergmann" <arnd@...db.de>
To: "Dorjoy Chowdhury" <dorjoychy111@...il.com>, linux-fsdevel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, "Alexander Viro" <viro@...iv.linux.org.uk>,
 "Christian Brauner" <brauner@...nel.org>, "Jan Kara" <jack@...e.cz>,
 "Jeff Layton" <jlayton@...nel.org>, "Chuck Lever" <chuck.lever@...cle.com>,
 "Alexander Aring" <alex.aring@...il.com>
Subject: Re: [PATCH 1/2] open: new O_REGULAR flag support

On Sun, Jan 25, 2026, at 15:14, Dorjoy Chowdhury wrote:

> diff --git a/include/uapi/asm-generic/errno-base.h 
> b/include/uapi/asm-generic/errno-base.h
> index 9653140bff92..ea9a96d30737 100644
> --- a/include/uapi/asm-generic/errno-base.h
> +++ b/include/uapi/asm-generic/errno-base.h
> @@ -36,5 +36,6 @@
>  #define	EPIPE		32	/* Broken pipe */
>  #define	EDOM		33	/* Math argument out of domain of func */
>  #define	ERANGE		34	/* Math result not representable */
> +#define	ENOTREGULAR	35      /* Not a regular file */

This clashes with EDEADLK on most architectures, or with
EAGAIN on alpha and ENOMSG on mips/parisc. You probably
need to pick the next free value in uapi/asm-generic/errno.h
and arch/*/include/uapi/asm/errno.h and keep this sorted
after EHWPOISON if you can't find an existing error code.

> diff --git a/include/uapi/asm-generic/fcntl.h b/include/uapi/asm-generic/fcntl.h
> index 613475285643..11e5eadab868 100644
> --- a/include/uapi/asm-generic/fcntl.h
> +++ b/include/uapi/asm-generic/fcntl.h
> @@ -88,6 +88,10 @@
>  #define __O_TMPFILE	020000000
>  #endif
> 
> +#ifndef O_REGULAR
> +#define O_REGULAR       040000000
> +#endif

This in turn clashes with O_PATH on alpha, __O_TMPFILE on
parisc, and __O_SYNC on sparc. We can probably fill the holes
in asm/fcntl.h to define this.

      Arnd