From: Theodore Ts'o <tytso@mit.edu>
Date: Mon, 1 Jul 2013 12:12:41 +0000 (-0400)
Subject: jbd2: invalidate handle if jbd2_journal_restart() fails
X-Git-Tag: omap-for-v3.11/fixes-for-merge-window~83^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=41a5b913197c3a25fddef1735dc9b3d1fdc57428;p=pandora-kernel.git

jbd2: invalidate handle if jbd2_journal_restart() fails

If jbd2_journal_restart() fails the handle will have been disconnected
from the current transaction.  In this situation, the handle must not
be used for for any jbd2 function other than jbd2_journal_stop().
Enforce this with by treating a handle which has a NULL transaction
pointer as an aborted handle, and issue a kernel warning if
jbd2_journal_extent(), jbd2_journal_get_write_access(),
jbd2_journal_dirty_metadata(), etc. is called with an invalid handle.

This commit also fixes a bug where jbd2_journal_stop() would trip over
a kernel jbd2 assertion check when trying to free an invalid handle.

Also move the responsibility of setting current->journal_info to
start_this_handle(), simplifying the three users of this function.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: Younger Liu <younger.liu@huawei.com>
Cc: Jan Kara <jack@suse.cz>
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