From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 29 Nov 2012 20:27:00 +0000 (-0800)
Subject: direct-io: don't read inode->i_blkbits multiple times
X-Git-Tag: v3.7-rc8~5^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab73857e354ab9e317613cba7db714e2c12c6547;p=pandora-kernel.git

direct-io: don't read inode->i_blkbits multiple times

Since directio can work on a raw block device, and the block size of the
device can change under it, we need to do the same thing that
fs/buffer.c now does: read the block size a single time, using
ACCESS_ONCE().

Reading it multiple times can get different results, which will then
confuse the code because it actually encodes the i_blksize in
relationship to the underlying logical blocksize.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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