Re: 2.4.0-test10-pre3:Oops in mm/filemap.c:filemap_write_pa

[Linus Torvalds]

On Mon, 23 Oct 2000, Linus Torvalds wrote:
> 
> I'm starting to suspect that we leave this path as-is, and just fix the
> mapping case (and PageUptodate() can work there). That should also avoid
> the nasties.

..and even that looks like I'd have to do the quick-and-dirty case with
the race still there on SMP. Adding the page Uptodate logic to the VM
layer proper is too painful at this point - every single nopage function
would have to be updated to mark its page up-to-date, as they don't
generally do that currently.

Also, the fact that Petr didn't see anything trigger in nopage() makes me
nervous again. Even if the problem happened during read-ahead, it should
have gotten into the address space only through nopage. Maybe there is
some vma that isn't added to the right inode VM list - so that we end up
missing part of the vmtruncate() stuff?

Al, any ideas?

                Linus

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