Re: Crash and stack trace for jbd2 under ext4

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在 2008-07-21一的 13:50 +0530,Aneesh Kumar K.V写道:
> On Mon, Jul 21, 2008 at 02:28:39PM +1000, Shehjar Tikoo wrote:
> > Hi all
> >
> > Please see the contents of the file
> > for details of two similar crashes observed
> > on two different commits. Both crashes were
> > observed while using ext4 on the server while
> > accessing the export through NFSv3. The link
> > has more details.
> >
> > http://www.gelato.unsw.edu.au/~shehjart/docs/jbd_ext4_crash.txt
> >
> 
> I guess we cannot use
> #define EXT4_MAX_WRITEBACK_CREDITS    DIO_CREDITS
> 
> We do multiple block allocation in ext4_da_writepages and we can 
> get these blocks from different block groups. So we may need to update
> bitmap of multiple groups.
> 
> -aneesh

Yeah, the journal credit reservation for writepages() need a little
attention.  I will send a RFC patch shortly.

Mingming

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