linux-kernel - Re: msync(2) bug(?), returns AOP_WRITEPAGE

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Message-Id: <200710251644.l9PGilSK021536@agora.fsl.cs.sunysb.edu>
Date:	Thu, 25 Oct 2007 12:44:47 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Erez Zadok <ezk@...sunysb.edu>, Ryan Finnie <ryan@...nie.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	cjwatson@...ntu.com, linux-mm@...ck.org, neilb@...e.de
Subject: Re: msync(2) bug(?), returns AOP_WRITEPAGE_ACTIVATE to userland 

That's a nice historical review, Huge, of how got into these mess we're in
now -- it all starts with good intentions. :-)

On a related note, I would just love to get rid of calling the lower
->writepage in unionfs b/c I can't even tell if I have a lower page to use
all the time.  I'd prefer to call vfs_write() if I can, but I'll need a
struct file, or at least a dentry.

What ecryptfs does is store a struct file inside it's inode, so it can use
it later in ->writepage to call vfs_write on the lower f/s.  And Unionfs may
have to go in that direction too, but this trick is not terribly clean --
storing a file inside an inode.

I realize that the calling path to ->writepage doesn't have a file/dentry
any more, but if we're considering larger changes to the writepage related
code, can we perhaps consider passing a file or dentry to >writepage (same
as commit_write, perhaps).

Thanks,
Erez.
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