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From: Andrew Morton on 27 Jul 2010 19:20
On Mon, 26 Jul 2010 16:25:42 +0800
wzt.wzt(a)gmail.com wrote:

> mapping->a_ops->direct_IO() is not checked, if it's a NULL pointer,
> that will casue an oops. pagecache_write_begin/end is exported to
> other functions, so they need to check null pointer before use them.
>

The patch checks a lot more things than ->directIO!

It would be best to not add this overhead if possible. Did you
actually observe an oops? If so, please fully describe it.

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