Re: [PATCH] Fix race in do_get_write_access()

[Jan Kara]

  Hello,

> On Mon, 2005-07-11 at 17:10, Jan Kara wrote:
> 
> >   attached patch should fix the following race:
> ...
> >   and we have sent wrong data to disk... We now clean the dirty buffer
> > flag under buffer lock in all cases and hence we know that whenever a buffer
> > is starting to be journaled we either finish the pending write-out
> > before attaching a buffer to a transaction or we won't write the buffer
> > until the transaction is going to be committed... Please apply.
> 
> Looks good to me.
> 
> Btw, how did you find this?  Were you able to reproduce this in
> practice?
  I was not able to reproduce the problem in practice (not that I'd try
very much). When I was fixing the checkpointing code I noted that
ll_rw_block() need not actually send data to disk because of buffer
being locked. So I started inspecting how do we actually use buffer
lock and found this problem...

								Honza
-- 
Jan Kara <jack@xxxxxxx>
SuSE CR Labs
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