From: Dmitry Monakhov <dmonakhov@openvz.org>
Date: Mon, 28 Jul 2014 02:32:27 +0000 (-0400)
Subject: ext4: fix incorrect locking in move_extent_per_page
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~162^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6e2631463f3a2ce430a295c68aead3ff228ca3cf;p=pandora-kernel.git

ext4: fix incorrect locking in move_extent_per_page

If we have to copy data we must drop i_data_sem because of
get_blocks() will be called inside mext_page_mkuptodate(), but later we must
reacquire it again because we are about to change extent's tree

Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
---

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