Re: extra PG_* bits for page->flags

[Andrew Morton]

David Howells <[e-mail]> wrote:
>
> 
> Hi Linus,
> 
> I'm writing a cache filesystem for primarily for caching AFS pages, but that
> also can be used for caching other network FS pages (such as NFSv4, which Jeff
> Garzik and Trond Myklebust are interested in, I think).

Is a new fs needed?  Is it not possible to use an existing filesystem of the
user's choice for local caching?

> ...
> 
>  (*) PG_journal
>  (*) PG_journalmark

Well.  If you new fs goes in then yes, we can spare those bits (just).  If
possible, consider making them "opaque address_space-private", so this prime
real estate can be shared with other filesystems (eg, PG_checked).