From: Richard Weinberger <richard@nod.at>
Date: Wed, 2 Nov 2011 12:17:27 +0000 (+0100)
Subject: um: fix ubd cow size
X-Git-Tag: v3.2-rc1~87^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8535639810e578960233ad39def3ac2157b0c3ec;p=pandora-kernel.git

um: fix ubd cow size

ubd_file_size() cannot use ubd_dev->cow.file because at this time
ubd_dev->cow.file is not initialized.
Therefore, ubd_file_size() will always report a wrong disk size when
COW files are used.
Reading from /dev/ubd* would crash the kernel.

We have to read the correct disk size from the COW file's backing
file.

Signed-off-by: Richard Weinberger <richard@nod.at>
CC: stable@kernel.org
---

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