Re: + maps2-export-page-index-in-kpagemap.patch added to -mm tree

[Fengguang Wu <wfg@mail.ustc.edu.cn>]

On Mon, Sep 24, 2007 at 05:02:02PM -0500, Matt Mackall wrote:
> I think Fengguang is just thinking forward to the next logical step
> here which is "expose what's in the page cache". Which means being

I have been doing it for a long time - that's the filecache patch I
sent you. However it's not quite ready for a public review.

> able to go from page back to device:inode:offset or (better, but
> trickier) path:offset.

It's doing the other way around - a top-down way.

First, you get a table of all cached inodes with the following fields:
  device-number  inode-number  file-path  cached-page-count  status

Then, one can query any file he's interested in, and list all its
cached pages in the following format:
  index  length  page-flags  reference-count
(Sorry, it's the same format I have proposed in the pmaps interface.)

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