From: Jan Kara <jack@suse.cz>
Date: Thu, 21 Apr 2011 21:47:16 +0000 (+0200)
Subject: ext3: Fix lock inversion in ext3_symlink()
X-Git-Tag: v3.0-rc1~307^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ae54870a1dc978a88377ae8af0780648f2ccd4dc;p=pandora-kernel.git

ext3: Fix lock inversion in ext3_symlink()

ext3_symlink() cannot call __page_symlink() with transaction open.
__page_symlink() calls ext3_write_begin() which gets page lock which ranks
above transaction start (thus lock ordering is violated) and and also
ext3_write_begin() waits for a transaction commit when we run out of space
which never happens if we hold transaction open.

Fix the problem by stopping a transaction before calling __page_symlink()
(we have to be careful and put inode to orphan list so that it gets deleted
in case of crash) and starting another one after __page_symlink() returns
for addition of symlink into a directory.

Signed-off-by: Jan Kara <jack@suse.cz>
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