> Now we know when we can block so we can run f_ops->write ourselfs that's also
> more efficient in terms of both performance and also memory pressure during
> swap of course.

Yep

> As said reiserfs AFIK didn't need any change, so only VFS is using
> fs_down/fs_up from the point of view of reiserfs.

Ok. Im not keen on adding fs_down but it does look like the right bandage
(and a nice speed up) for 2.2. 

I hate that kind of bug

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