how to implement prepare_write, commit_write for ubifs

[Ivan]

Thankyou very much for the information!


Sent from my iPhone

On 2009年6月17日, at 16:29, Artem Bityutskiy <dedekind at infradead.org>  
wrote:

> On Wed, 2009-06-17 at 15:53 +0800, Ivan Chan wrote:
>> Hi all,
>>
>> I am porting UBIFS/UBI to 2.6.4 kernel, however, 2.6.4 kernel  
>> requires
>> prepare_write, commit_write in address_space_operations (defined in
>> include/linux/fs.h),
>> but it is no longer exists in 2.6.2x kernel.
>>
>> How can I rewrite these function for 2.6.4 kernel?
>>
>> In 2.6.2x, there is similar function write_begin, and write_end, but
>> the API requires
>> struct address_space *mapping,  struct page **pagep, void **fsdata,
>>
>> Is that possible and how to provide this argument in 2.6.4 kernel?
>
> ATM we support UBIFS back-ports from v2.6.24 to v2.6.30.
>
> The change of the address space operation happened between 2.6.23 and
> 2.6.24.
>
> In the paste, we also supported UBIFS back-ports for kerneld
> 2.6.21-2.6.23. But then we dropped them because it became increasingly
> difficult to back-port stuff there.
>
> So what would suggest you do is:
>
> a). Start with the old and unsupported 2.6.23 UBIFS back-port which  
> you
> may find here: git://git.infradead.org/users/dedekind/ubifs- 
> v2.6.23.git
>
> b). Back-port this UBIFS 2.6.23 stuff to your ancient 2.6.4, it should
> be easier to do comparing to back-porting the newest stuff.
>
> c). Back port the rest of the UBIFS changes/fixes from the latest
> kernels, e.g., from the UBIFS 2.6.30 back-port.
>
> The back-ports URLS may be found here:
> http://www.linux-mtd.infradead.org/doc/ubifs.html#L_source
>
> Or just see here:
> http://git.infradead.org/
>
> -- 
> Best regards,
> Artem Bityutskiy (Битюцкий Артём)
>