linux-kernel - Re: [PATCH 29/30] microblaze_mmu

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Message-ID: <49F58A87.5020405@monstr.eu>
Date:	Mon, 27 Apr 2009 12:35:51 +0200
From:	Michal Simek <monstr@...str.eu>
To:	Christoph Hellwig <hch@...radead.org>
CC:	linux-kernel@...r.kernel.org, john.williams@...alogix.com,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 29/30] microblaze_mmu_v1: stat.h MMU update

Christoph Hellwig wrote:
> On Mon, Apr 27, 2009 at 10:32:18AM +0200, monstr@...str.eu wrote:
>> +# ifdef __uClinux__
>>  struct stat64 {
>>  	unsigned long long	st_dev;
>>  	unsigned long	__unused1;
>> @@ -69,5 +69,29 @@ struct stat64 {
>>  
>>  	unsigned long	__unused8;
>>  };
>> +# else /* __uClinux__ */
>> +/* FIXME */
>> +struct stat64 {
>> +	unsigned long long	st_dev; /* Device.*/
>> +	unsigned long long	st_ino; /* File serial number.*/
>> +	unsigned int		st_mode; /* File mode.*/
>> +	unsigned int		st_nlink; /* Link count. */
>> +	unsigned int		st_uid; /* User ID of the file's owner. */
>> +	unsigned int		st_gid; /* Group ID of the file's group. */
>> +	unsigned long long	st_rdev; /* Device number, if device. */
>> +	unsigned short		__pad2;
>> +	long long		st_size; /* Size of file, in bytes. */
>> +	int			st_blksize; /* Optimal block size for I/O. */
>> +	long long		st_blocks; /* No. 512-byte blocks allocated */
>> +	int			st_atime; /* Time of last access.  */
>> +	unsigned int		st_atime_nsec;
>> +	int			st_mtime; /* Time of last modification. */
>> +	unsigned int		st_mtime_nsec;
>> +	int			st_ctime; /* Time of last status change. */
>> +	unsigned int		st_ctime_nsec;
>> +	unsigned int		__unused4;
>> +	unsigned int		__unused5;
>> +};
>> +# endif /* __uClinux__ */
> 
> Userspace ABIs must not change because of MMU vs not.
> 

:-)

I expect that someone will beat me for last two patches.

Short answer: You are right I know about.

Long answer: in stat64 structure I wanted to find out more information
about stat64 structure. I mean there are some variables and they have different
types and I would like to know about more info.
For example
If make sense long long	type for st_blocks. IMHO unsigned will be better.
And I would like to create new stat64 structure where is not a fault for both noMMU/MMU version.
In noMMU implementation is st_blocks unsigned long. Is it OK? or unsigned long long is better?

Thanks,
Michal

-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
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