linux-kernel - Re: [PATCH 06/14] Pramfs: Include files

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Message-ID: <4A34A3A6.3080604@gmail.com>
Date:	Sun, 14 Jun 2009 09:15:50 +0200
From:	Marco <marco.stornelli@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Sam Ravnborg <sam@...nborg.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Daniel Walker <dwalker@....ucsc.edu>
Subject: Re: [PATCH 06/14] Pramfs: Include files

Arnd Bergmann wrote:
> On Saturday 13 June 2009, Sam Ravnborg wrote:
>>> +     union {
>>> +             struct {
>>> +                     /*
>>> +                      * ptr to row block of 2D block pointer array,
>>> +                      * file block #'s 0 to (blocksize/4)^2 - 1.
>>> +                      */
>>> +                     off_t row_block;
>> It is my understanding that we shall use: __kernel_off_t
>> in exported headers.
> 
> That is a correct understanding in general, however this case is
> different, because it describes an on-disk data structure,
> not a kernel to user space interface. Here, __kernel_off_t is just
> as wrong as off_t, because it will differ between 32 and 64 bit
> architectures, making the fs layout incompatible. I'd suggest
> simply defining this as __u64.
> 
> Moreover, file system layout should be described in terms of
> big-endian or little-endian types (e.g. __be64 or __le64),
> together with the right accessor functions.
> 
> 	Arnd <><
> 

Yep, you're right. I have to change the definition to be compatible
between 32 and 64 bit archs.

Marco

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