From: Chao Yu <chao2.yu@samsung.com>
Date: Wed, 28 May 2014 00:56:09 +0000 (+0800)
Subject: f2fs: avoid overflow when large directory feathure is enabled
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~73^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bfec07d0f8ed78b10df3ca3bc23e27de1166ea45;p=pandora-kernel.git

f2fs: avoid overflow when large directory feathure is enabled

When large directory feathure is enable, We have one case which could cause
overflow in dir_buckets() as following:
special case: level + dir_level >= 32 and level < MAX_DIR_HASH_DEPTH / 2.

Here we define MAX_DIR_BUCKETS to limit the return value when the condition
could trigger potential overflow.

Changes from V1
 o modify description of calculation in f2fs.txt suggested by Changman Lee.

Suggested-by: Changman Lee <cm224.lee@samsung.com>
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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