linux-kernel - Re: [PATCH 3/17] afs: convert afs_dir_get_page to read_kmap

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Message-ID: <29898.1176404243@redhat.com>
Date:	Thu, 12 Apr 2007 19:57:23 +0100
From:	David Howells <dhowells@...hat.com>
To:	"Nate Diller" <nate.diller@...il.com>
Cc:	"Andrew Morton" <akpm@...l.org>,
	"Alexander Viro" <viro@...iv.linux.org.uk>,
	"Christoph Hellwig" <hch@...radead.org>,
	"Roman Zippel" <zippel@...ux-m68k.org>,
	"Mikulas Patocka" <mikulas@...ax.karlin.mff.cuni.cz>,
	"David Woodhouse" <dwmw2@...radead.org>,
	"Dave Kleikamp" <shaggy@...tin.ibm.com>,
	"Anton Altaparmakov" <aia21@...tab.net>,
	"Evgeniy Dushistov" <dushistov@...l.ru>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	reiserfs-dev@...esys.com
Subject: Re: [PATCH 3/17] afs: convert afs_dir_get_page to read_kmap_page 

Nate Diller <nate.diller@...il.com> wrote:

> Hmmm you're right.  Is your security work going into the next -mm?

I don't know.  Andrew hasn't said anything.  Andrew?  Are you waiting for it
to go through DaveM's networking tree?

> If so, I'll just re-base this cleanup patch on that ... at the very least I
> want to get rid of afs_dir_put_page().

That's reasonable.

> Also, did you consider passing the key pointer directly and modifying the
> readpage actor to simply cast the pointer back, like
> read_mapping_page(mapping, page, (struct file *)key)?  It seems like a waste
> to allocate a whole file struct on the stack just for the ->private field.

There's one small problem with that...  And that's filemap_nopage() (it passes
vma->vm_file to readpage() unconditionally).  Unless, of course, your patches
fix that too...

David
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