From: Tyler Hicks <tyhicks@canonical.com>
Date: Thu, 13 Sep 2012 01:02:46 +0000 (-0700)
Subject: eCryptfs: Write out all dirty pages just before releasing the lower file
X-Git-Tag: v3.2.32~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f45faef3bca26259cb419692f70788e5b77f563;p=pandora-kernel.git

eCryptfs: Write out all dirty pages just before releasing the lower file

commit 7149f2558d5b5b988726662fe58b1c388337805b upstream.

Fixes a regression caused by:

821f749 eCryptfs: Revert to a writethrough cache model

That patch reverted some code (specifically, 32001d6f) that was
necessary to properly handle open() -> mmap() -> close() -> dirty pages
-> munmap(), because the lower file could be closed before the dirty
pages are written out.

Rather than reapplying 32001d6f, this approach is a better way of
ensuring that the lower file is still open in order to handle writing
out the dirty pages. It is called from ecryptfs_release(), while we have
a lock on the lower file pointer, just before the lower file gets the
final fput() and we overwrite the pointer.

https://launchpad.net/bugs/1047261

Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Reported-by: Artemy Tregubenko <me@arty.name>
Tested-by: Artemy Tregubenko <me@arty.name>
Tested-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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