linux-kernel - Re: [RFC][PATCH] make reiserfs stop using 'struct file' for internal xattr operations

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Message-Id: <20070927145125.1346901f.akpm@linux-foundation.org>
Date:	Thu, 27 Sep 2007 14:51:25 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Dave Hansen <haveblue@...ibm.com>
Cc:	hch@...radead.org, laurent.riffard@...e.fr,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	reiserfs-devel@...r.kernel.org
Subject: Re: [RFC][PATCH] make reiserfs stop using 'struct file' for
 internal xattr operations

On Thu, 27 Sep 2007 14:27:14 -0700
Dave Hansen <haveblue@...ibm.com> wrote:

> On Thu, 2007-09-27 at 22:04 +0100, Christoph Hellwig wrote:
> > On Thu, Sep 27, 2007 at 01:53:39PM -0700, Dave Hansen wrote:
> > > -int reiserfs_commit_write(struct file *f, struct page *page,
> > > -			  unsigned from, unsigned to);
> > > -int reiserfs_prepare_write(struct file *f, struct page *page,
> > > -			   unsigned from, unsigned to);
> > > +int reiserfs_commit_write(struct page *page, unsigned from, unsigned to);
> > > +int reiserfs_prepare_write(struct page *page, unsigned from, unsigned to);
> > 
> > I doubt this will work.  These are also used for the ->prepare_write
> > and ->commit_write aops, and the method signature definitively wants
> > a file there, even if it's zero..
> 
> Oddly enough, I don't see those functions being used in aops:
> 
> const struct address_space_operations reiserfs_address_space_operations = {
>         .writepage = reiserfs_writepage,
>         .readpage = reiserfs_readpage,
>         .readpages = reiserfs_readpages,
>         .releasepage = reiserfs_releasepage,
>         .invalidatepage = reiserfs_invalidatepage,
>         .sync_page = block_sync_page,
>         .write_begin = reiserfs_write_begin,
>         .write_end = reiserfs_write_end,
>         .bmap = reiserfs_aop_bmap,
>         .direct_IO = reiserfs_direct_IO,
>         .set_page_dirty = reiserfs_set_page_dirty,
> };
> 
> Plus, reiserfs seems to compile with that patch I just sent.  Sure as
> heck surprised me.
> 

That'll be because reiserfs-convert-to-new-aops.patch witched reiserfs over
to ->write_begin() and ->write_end().

So your stuff becomes dependent on Nick's stuff, and Nick's stuff is still
failing on NFS, I think.


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