linux-ext4 - [Bug 11688] Oops while writing on a newly ext4 formated 1TB partition on a external USB drive

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Message-Id: <20090120171843.787B410800C@picon.linux-foundation.org>
Date:	Tue, 20 Jan 2009 09:18:43 -0800 (PST)
From:	bugme-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 11688] Oops while writing on a newly ext4 formated 1TB partition on a external USB drive

http://bugzilla.kernel.org/show_bug.cgi?id=11688





------- Comment #9 from jack@...e.cz  2009-01-20 09:18 -------
Ted, I've looked into this and it is a bug in ext4. It should call
grab_cache_page_write_begin() with AOP_FLAG_NOFS since it cannot handle
recursion into the filesystem for freeing memory. The problem is that at the
time grab_cache_page_write_begin() is called, a transaction is already started
- this is what quota code complains about (because it also needs to start a
transaction but current->journal_info is already occupied by ext4).

If we wanted to avoid AOP_FLAG_NOFS we could get the page, start a transaction,
lock and check the page but that's going to be a bit nasty.


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