| Re: [PATCH] incorrect error handling inside generic_file_direct_write [message #9417 is a reply to message #9081] |
Tue, 02 January 2007 11:17  |
Christoph Hellwig
Messages: 59
Registered: April 2006
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On Fri, Dec 15, 2006 at 10:53:18AM -0800, Chen, Kenneth W wrote:
> Christoph Hellwig wrote on Friday, December 15, 2006 2:44 AM
> > So we're doing the sync_page_range once in __generic_file_aio_write
> > with i_mutex held.
> >
> >
> > > mutex_lock(&inode->i_mutex);
> > > - ret = __generic_file_aio_write_nolock(iocb, iov, nr_segs,
> > > - &iocb->ki_pos);
> > > + ret = __generic_file_aio_write(iocb, iov, nr_segs, pos);
> > > mutex_unlock(&inode->i_mutex);
> > >
> > > if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
> >
> > And then another time after it's unlocked, this seems wrong.
>
>
> I didn't invent that mess though.
>
> I should've ask the question first: in 2.6.20-rc1, generic_file_aio_write
> will call sync_page_range twice, once from __generic_file_aio_write_nolock
> and once within the function itself. Is it redundant? Can we delete the
> one in the top level function? Like the following?
Really? I'm looking at -rc3 now as -rc1 is rather old and it's definitly
not the case there. I also can't remember ever doing this - when I
started the generic read/write path untangling I had exactly the same
situation that's now in -rc3:
- generic_file_aio_write_nolock calls sync_page_range_nolock
- generic_file_aio_write calls sync_page_range
- __generic_file_aio_write_nolock doesn't call any sync_page_range variant
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