linux-kernel - Re: [PATCH 3/3] AFS: Implement basic file write support

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Message-Id: <20070509034135.853ae84c.akpm@linux-foundation.org>
Date:	Wed, 9 May 2007 03:41:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Howells <dhowells@...hat.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 3/3] AFS: Implement basic file write support

On Wed, 09 May 2007 11:25:47 +0100 David Howells <dhowells@...hat.com> wrote:

> > > +	set_page_dirty(page);
> > > +
> > > +	if (PageDirty(page))
> > > +		_debug("dirtied");
> > > +
> > > +	return 0;
> > > +}
> > 
> > One would normally run mark_inode_dirty() after any i_size_write()?
> 
> Not in this case, I assume, because set_page_dirty() ultimately calls
> __mark_inode_dirty(), but I could be wrong.

set_page_dirty() will set I_DIRTY_PAGES only.  ie: the inode has dirty
pagecache data.

To tell the VFS that the inode itself is dirty one needs to run
mark_inode_dirty().  Or maybe mark_inode_dirty_sync() but I can never for
the life of me remember what that thing does.

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