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SubjectRe: invalidate_inode_pages in 2.5.32/3
From
>>>>> " " == Andrew Morton <akpm@zip.com.au> writes:

> Oh. I thought this was a "purely theoretical" discussion
> because it only pertains to directory data. You seem to be
> saying that NFS is doing this for S_ISREG pagecache also?

Yes. Chuck's particular example pertains to directory data, but if
we're to expand the discussion to what *should* we be doing, then we
need to consider the S_ISREG case too.

> Again: what do you _want_ to do? Having potentially incorrect
> pagecache mapped into process memory space is probably not the
> answer to that ;)

> Should we be forcibly unmapping the pages from pagetables?
> That would result in them being faulted in again, and re-read.

If we could do that for unlocked pages, and at the same time flush out
any pending writes, then that would be ideal. As long as the
page_count() thing is there, we *do* unfortunately have a potential
for cache corruption.

>> (btw: there's currently a bug w.r.t. that'. If I understand you
>> correctly, the releasepage() thing is unrelated to
>> page->buffers, but the call in shrink_cache() is masked by an
>> 'if (page->buffers))

> That would be in a 2.4 kernel? In 2.4, page->buffers can only
> contain buffers. If it contains anything else the kernel will
> die.

2.5.33

> If your mapping has old, dirty pages then the VM will call your
-> vm_writeback to write some of them back. Or it will repeatedly
> call ->writepage if you don't define ->vm_writeback. That's
> the place to clean the pages.

OK. I'll think about that. I'm off to France on a fortnight's vacation
now. Should leave me with a bit of free time, so once I finish the VFS
credential code, I'll try to find some time to catch up on your recent
changes...

Cheers,
Trond
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