lkml.org 
[lkml]   [2009]   [Dec]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: reiser4: newbie help needed?
Johannes Buchner wrote:
> On Wed, 02 Dec 2009 10:21:18 +0100
> Edward Shishkin <edward.shishkin@gmail.com> wrote:
>
>
>> Johannes Buchner wrote:
>>

Hello.

>>> I took a look at the TODO lists, are there any simple tasks to
>>> do for newbies?
>>>
>> If you mean the "todo for inclusion", then no.
>>
>> Reiser4 has only one technical issue. It can
>> be resolved only by very experienced people.
>>
>
> Thanks for replying. I did not have to the inclusion of
> reiser4 in mind specifically.
>
>
>>> I also believe that on 'sync', reiser4 currently does absolutely
>>> nothing.
>>>
>> this is not good: a file system should respond on sync (1).
>>
>>
>>> The comment in reiser4_sync_inodes says reiser4 does its own
>>> flush elsewhere. Should this be different?
>>>
>>>
>> you might want to ask such question _before_ sending patches to akpm.
>>
>
> I was under the believe that I did not change the behaviour. I see my
> mistake now, I was looking at the wrong if-branch.
>

Nop. You've lost the whole point of using of ->sync_inodes(), which is
responsible for reiser4 background (and non-background) writeback,
and now it is not involved by any path.

Here is a good explanation why we need this additional super operation:
http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.21-rc3/2.6.21-rc3-mm1/broken-out/reiser4-sb_sync_inodes.patch

> I tried now to come up with a correct version for some hours, but I keep
> having NULL problems. Maybe a writeback_control object has to be
> created, possibly even in fs/fs-writeback.c:sync_inodes_sb, as
> write_inode_now does below. I tried that too, but it gave me a
> recursion.

It may happens because of missed checks that a process is of pdflush-style.
Perhaps, we need to rename the current_is_pdflush() and get it back.

Thanks,
Edward.

> I'm not sure what the rationale was for introducing a call
> with NULL here. Sorry I can't correct this.
>
> Looking forward to your review.
>
> Best wishes,
> Johannes
>
>



\
 
 \ /
  Last update: 2009-12-04 20:39    [W:0.056 / U:3.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site