From: Theodore Ts'o <tytso@mit.edu>
Date: Tue, 23 Apr 2013 12:59:35 +0000 (-0400)
Subject: ext4: fix type-widening bug in inode table readahead code
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~83^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0d606e2c9fccdd4e67febf1e2da500e1bfe9e045;p=pandora-kernel.git

ext4: fix type-widening bug in inode table readahead code

Due to a missing cast, the high 32-bits of a 64-bit block number used
when calculating the readahead block for inode tables can get lost.
This means we can end up fetching the wrong blocks for readahead for
file systems > 16TB.

Linus found this when experimenting with an enhacement to the sparse
static code checker which checks for missing widening casts before
binary "not" operators.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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