linux-ext4 - booked-page-flag.patch

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Message-Id: <20070215004504.023a90f0.akpm@linux-foundation.org>
Date:	Thu, 15 Feb 2007 00:45:04 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Theodore Ts'o" <tytso@....edu>, Alex Tomas <alex@...sterfs.com>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: booked-page-flag.patch

Sorry, we're seriously, seriously, seriously short on flags in the page
struct and this patch is going to need one heck of a good case for it to be
acceptable.

Even then, we should put a lot of effort into finding some way of avoiding
adding that page flag.  One option might be to add a new radix-tree tag,
and defining it as "for filesytem usage".  Or use PG_checked (which should
be renamed to to PG_fs_misc) (if that doesn't conflict with ext4's existing
use of PG_checked).  Or use !PageMappedToDisk()?

These patches seem to have a number of issues - we should get them properly
commented and properly changelogged then get them on the wire for decent
review before investing too much in them, please.
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