linux-kernel - Re: [PATCH 4/11] eCryptfs: Replace encrypt, decrypt, and inode size write

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Message-ID: <20070920214447.GB8496@halcrow.austin.ibm.com>
Date:	Thu, 20 Sep 2007 16:44:47 -0500
From:	Michael Halcrow <mhalcrow@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	ecryptfs-devel@...ts.sourceforge.net
Subject: Re: [PATCH 4/11] eCryptfs: Replace encrypt, decrypt, and inode size write

On Wed, Sep 19, 2007 at 10:46:26PM -0700, Andrew Morton wrote:
(from ecryptfs_encrypt_page()):
> > +	enc_extent_virt = kmalloc(PAGE_CACHE_SIZE, GFP_USER);
> 
> I'd have thought that alloc_page() would be nicer.  After all, we _are_
> treating it as a page, and not as a random piece of memry.
>
> > +	if (!enc_extent_virt) {
> > +		rc = -ENOMEM;
> > +		ecryptfs_printk(KERN_ERR, "Error allocating memory for "
> > +				"encrypted extent\n");
> > +		goto out;
> > +	}
> > +	enc_extent_page = virt_to_page(enc_extent_virt);
> 
> And then we don't need this.

If neither kmap() nor kmap_atomic() can be safely used to get a
virtual address to pass to vfs_write(), then I do not know what my
other options are here.
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