linux-kernel - Re: [PATCH] Separate FMODE_PREAD/FMODE

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Message-ID: <ed628a920902041813n4857aab4hc0e592a652de31b0@mail.gmail.com>
Date:	Wed, 4 Feb 2009 18:13:37 -0800
From:	Paul Turner <pjt@...gle.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, adobriyan@...il.com,
	ebiederm@...ssion.com
Subject: Re: [PATCH] Separate FMODE_PREAD/FMODE_PWRITE into separate flags

(fix typo on Eric's email address)

On Wed, Feb 4, 2009 at 6:06 PM, Paul Turner <pjt@...gle.com> wrote:
> Separate FMODE_PREAD and FMODE_PWRITE into separate flags to reflect the
> reality that the read and write paths may have independent restrictions.
>
> A git grep verifies that these flags are always cleared together so this new
> behavior will only apply to interfaces that change to clear flags individually.
>
> Signed-off-by: Paul Turner <pjt@...gle.com>
> ---
>  include/linux/fs.h |   13 +++++++------
>  1 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/include/linux/fs.h b/include/linux/fs.h
> index 6022f44..d6a51d9 100644
> --- a/include/linux/fs.h
> +++ b/include/linux/fs.h
> @@ -60,18 +60,19 @@ struct inodes_stat_t {
>  #define FMODE_WRITE            ((__force fmode_t)2)
>  /* file is seekable */
>  #define FMODE_LSEEK            ((__force fmode_t)4)
> -/* file can be accessed using pread/pwrite */
> +/* file can be accessed using pread */
>  #define FMODE_PREAD            ((__force fmode_t)8)
> -#define FMODE_PWRITE           FMODE_PREAD     /* These go hand in hand */
> +/* file can be accessed using pwrite */
> +#define FMODE_PWRITE           ((__force fmode_t)16)
>  /* File is opened for execution with sys_execve / sys_uselib */
> -#define FMODE_EXEC             ((__force fmode_t)16)
> +#define FMODE_EXEC             ((__force fmode_t)32)
>  /* File is opened with O_NDELAY (only set for block devices) */
> -#define FMODE_NDELAY           ((__force fmode_t)32)
> +#define FMODE_NDELAY           ((__force fmode_t)64)
>  /* File is opened with O_EXCL (only set for block devices) */
> -#define FMODE_EXCL             ((__force fmode_t)64)
> +#define FMODE_EXCL             ((__force fmode_t)128)
>  /* File is opened using open(.., 3, ..) and is writeable only for ioctls
>    (specialy hack for floppy.c) */
> -#define FMODE_WRITE_IOCTL      ((__force fmode_t)128)
> +#define FMODE_WRITE_IOCTL      ((__force fmode_t)256)
>
>  /*
>  * Don't update ctime and mtime.
> --
> 1.5.4.5
>
> --
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