Re: Delayed alloc for ordered-mode

[Badari Pulavarty <pbadari@us.ibm.com>]

I think adding support to JBD to deal with "bio"s  would be
a valuable generic extention. Anyway its dealing with "bh"s
now.

Thanks,
Badari

Suparna Bhattacharya wrote:

> What would be really nice is if we could do this in a way that
> enables reuse of generic paths even for ordered mode. One thought
> that comes to mind is journal commit waiting for writeback to 
> complete on the data pages which need to be flushed to disk before 
> meta-data can be committed, much like we do for O_SYNC. 
> 
> I realise that JBD is intended to work at a level of abstraction
> where it has no awareness of filesystems - hence the correspondence
> with buffer heads all through. So would the above be a complete
> no-no ?
> 
> Regards
> Suparna
> 
> On Fri, Mar 04, 2005 at 06:02:35PM +0300, Alex Tomas wrote:
> 
>>On 03 Mar 2005 17:12:14 -0800
>>Badari Pulavarty <pbadari@us.ibm.com> wrote:
>>
>>
>>>One more thing, we need to keep in mind is - we need to make sure
>>>that "ordered" mode also improved - since all our testcode 
>>>focuses on "writeback" mode and the default mode is "ordered" :(
>>>
>>
>>I've just cooked the patch to implement ordered mode for delayed
>>allocation path. please take it:
>>
>>ftp://ftp.clusterfs.com/pub/people/alex/2.6.11/ext3-delalloc-ordered-2.6.11-0.1.patch
>>
>>Stephen, Andrew could you review it, please?
>>
>>thanks, Alex