From: Theodore Ts'o <tytso@mit.edu>
Date: Mon, 21 Apr 2014 18:37:52 +0000 (-0400)
Subject: ext4: fix locking for O_APPEND writes
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~45^2~29^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f5ccfe1ddbaf9d923a3ebdadcb1e5e32d83e9c28;p=pandora-kernel.git

ext4: fix locking for O_APPEND writes

Al Viro pointed out that locking for O_APPEND writes was problematic,
since the location of the write isn't known until after we take the
i_mutex, which impacts the ext4_unaligned_aio() and s_bitmap_maxbytes
check.

For O_APPEND always assume that the write is unaligned so call
ext4_unwritten_wait().  And to solve the second problem, take the
i_mutex earlier before we start the s_bitmap_maxbytes check.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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