linux-kernel - Re: [PATCH 42/56] microblaze

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Date:	Mon, 5 May 2008 00:31:38 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	monstr@...nam.cz
Cc:	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	stephen.neuendorffer@...inx.com, John.Linn@...inx.com,
	john.williams@...alogix.com, matthew@....cx, will.newton@...il.com,
	drepper@...hat.com, microblaze-uclinux@...e.uq.edu.au,
	grant.likely@...retlab.ca, Michal Simek <monstr@...str.eu>
Subject: Re: [PATCH 42/56] microblaze_v2: stats headers

On Sunday 04 May 2008, monstr@...nam.cz wrote:
> +struct stat {
> +	unsigned int	st_dev;
> +	unsigned long	st_ino;
> +	unsigned int	st_mode;
> +	unsigned int	st_nlink;
> +	unsigned int	st_uid;
> +	unsigned int	st_gid;
> +	unsigned int	st_rdev;
> +	long		st_size;
> +	unsigned long	st_blksize;
> +	unsigned long	st_blocks;
> +	unsigned long	st_atime;
> +	unsigned long	__unused1;
> +	unsigned long	st_mtime;
> +	unsigned long	__unused2;
> +	unsigned long	st_ctime;
> +	unsigned long	__unused3;
> +	unsigned long	__unused4;
> +	unsigned long	__unused5;
> +};
> +
> +struct stat64 {
> +	unsigned long long	st_dev;
> +	unsigned long	__unused1;
> +
> +	unsigned long long	st_ino;
> +
> +	unsigned int	st_mode;
> +	unsigned int	st_nlink;
> +
> +	unsigned int	st_uid;
> +	unsigned int	st_gid;
> +
> +	unsigned long long	st_rdev;
> +	unsigned long	__unused3;
> +
> +	long long	st_size;
> +	unsigned long	st_blksize;
> +
> +	unsigned long	st_blocks; /* No. of 512-byte blocks allocated */
> +	unsigned long	__unused4; /* future possible st_blocks high bits */
> +
> +	unsigned long	st_atime;
> +	unsigned long	st_atime_nsec;
> +
> +	unsigned long	st_mtime;
> +	unsigned long	st_mtime_nsec;
> +
> +	unsigned long	st_ctime;
> +	unsigned long	st_ctime_nsec;
> +
> +	unsigned long	__unused8;
> +};

There should only be a 'struct stat', not stat64, and it would be nice
to have that in asm-generic/stat.h.

I think it should be defined as

struct stat {
	unsigned long long	st_dev;

	unsigned long long	st_ino;

	unsigned int		st_mode;
	unsigned int		st_nlink;

	unsigned int		st_uid;
	unsigned int		st_gid;

	unsigned long long	st_rdev;

	long long		st_size;

	unsigned int		st_blksize;
	unsigned int		__unused1;

	unsigned long long	st_blocks; /* No. of 512-byte blocks allocated */

	unsigned int		st_atime;
	unsigned int		st_atime_nsec;

	unsigned int		st_mtime;
	unsigned int		st_mtime_nsec;

	unsigned int		st_ctime;
	unsigned int		st_ctime_nsec;

	unsigned int		__unused2;
	unsigned int		__unused3;
};

This way, you don't have any unnecessary padding, and the structure
is compatible in 32 and 64 bit architectures.

	Arnd <><
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