On Tue, 18 Sep 2007, Andrew Morton wrote:
> How hard would it be to handle the allocation failure in a more friendly
> manner? Say, if the allocation failed then point mapping->dirty_nodes at
> some global all-ones nodemask, and then special-case that nodemask in the
> freeing code?
Ack. However, the situation dirty_nodes == NULL && inode dirty then means
that unknown nodes are dirty. If we are later are successful with the
alloc and we know that the pages are dirty in the mapping then the initial
dirty_nodes must be all ones. If this is the first page to be dirtied then
we can start with a dirty_nodes mask of all zeros like now.
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