linux-kernel - Re: [PATCH 8/11] eCryptfs: Convert mmap functions to use persistent file

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Message-ID: <20070920220352.GC8496@halcrow.austin.ibm.com>
Date:	Thu, 20 Sep 2007 17:03:52 -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 8/11] eCryptfs: Convert mmap functions to use persistent file

On Wed, Sep 19, 2007 at 10:50:57PM -0700, Andrew Morton wrote:
> On Mon, 17 Sep 2007 16:50:16 -0500 Michael Halcrow <mhalcrow@...ibm.com> wrote:
> > +ecryptfs_copy_up_encrypted_with_header(struct page *page,
> > +				       struct ecryptfs_crypt_stat *crypt_stat)
> > +{
...
> > +			flush_dcache_page(page);
> > +			if (rc) {
> > +				ClearPageUptodate(page);
> > +				printk(KERN_ERR "%s: Error reading xattr "
> > +				       "region; rc = [%d]\n", __FUNCTION__, rc);
> > +				goto out;
> > +			}
> > +			SetPageUptodate(page);
> 
> I don't know what sort of page `page' refers to here, but normally we only
> manipulate the page uptodate status under lock_page().

This is the page that eCryptfs gets via
ecryptfs_aops->ecryptfs_readpage(), so this should be okay. The
comment should make the fact that the page is locked explicit.

Signed-off-by: Michael Halcrow <mhalcrow@...ibm.com>

---
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 04103ff..c6a8a33 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -111,7 +111,7 @@ static void set_header_info(char *page_virt,
  * ecryptfs_copy_up_encrypted_with_header
  * @page: Sort of a ``virtual'' representation of the encrypted lower
  *        file. The actual lower file does not have the metadata in
- *        the header.
+ *        the header. This is locked.
  * @crypt_stat: The eCryptfs inode's cryptographic context
  *
  * The ``view'' is the version of the file that userspace winds up
-
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