Re: [RFC] page lock ordering and OCFS2

[Zach Brown]

Anton Altaparmakov wrote:

> What I would ask is why does the above dlm thread need to hold the 
> data_lock duing truncate_inode_pages?

I hope the mail I just sent made that a little more clear.

> and repeat truncate_inode_pages, etc.  Eventually it will succeed.  And no 
> need for nasty VFS patch you are proposing...

Yeah, this also came to me this morning in the shower :)  There are some
hard cases because these are actually read-write locks, but it might be
doable.  We're discussing it.

> no pages left, unless there is an overeager read process at work on that 
> mapping at the same time.

I fear that it'll be pretty easy to get bad capture effects, but maybe
that's ok.  We'll see.

- z
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