Re: RFC: [PATCH-2.6] Add helper function to lock multiple pagecache pages.

[Andrew Morton]

Anton Altaparmakov <aia21@xxxxxxxxx> wrote:
>
> Below is a patch which adds a function 
>  mm/filemap.c::find_or_create_pages(), locks a range of pages.  Please see 
>  the function description in the patch for details.

This isn't very nice, is it, really?  Kind of a square peg in a round hole.

If you took the approach of defining a custom file_operations.write() then
I'd imagine that the write() side of things would fall out fairly neatly:
no need for s_umount and i_sem needs to be taken anyway.  No trylocking.

And for the vmscan->writepage() side of things I wonder if it would be
possible to overload the mapping's ->nopage handler.  If the target page
lies in a hole, go off and allocate all the necessary pagecache pages, zero
them, mark them dirty?
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