On Tue, 10 Jan 2006, Andrew Morton wrote:
> So let's see. Suppose the kernel is about to dink with a page's buffer
> ring. It does:
>
> get_page(page);
> lock_page(page);
> dink_with(page_buffers(page));
>
> how do these patches ensure that the page doesn't get migrated under my
> feet?
The page is locked when buffer_migrate_page is called. Thus
lock_page
will block.
If the refcount was increased before the migration code does the lock
on the tree_lock then the migration will be aborted.
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