linux-kernel - Potential fix for fdtable badness.

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Date:	Tue, 10 Oct 2006 19:08:18 -0700
From:	Vadim Lobanov <vlobanov@...akeasy.net>
To:	Dave Kleikamp <shaggy@...tin.ibm.com>,
	Olof Johansson <olof@...om.net>,
	Linas Vepstas <linas@...tin.ibm.com>,
	Bryce Harrington <bryce@...l.org>,
	Andrew Morton <akpm@...l.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Potential fix for fdtable badness.

All,

Sorry about the recent fdtable badness that you all encountered. I'm working
on getting a fix out there.

Dave, Olof, Linas, Bryce,

Could you please test the patch at the bottom of the email to see if it makes
your computers happy again, if you have the time and inclination to do so?

Andrew,

Would you prefer me to resend a fixed patch #4, or a new fix (#5) on top of
what's in your tree?

diff -Npru old/fs/file.c new/fs/file.c
--- old/fs/file.c	2006-10-10 18:58:21.000000000 -0700
+++ new/fs/file.c	2006-10-10 19:01:03.000000000 -0700
@@ -164,9 +164,8 @@ static struct fdtable * alloc_fdtable(un
 	 * the fdarray into page-sized chunks: starting at a quarter of a page,
 	 * and growing in powers of two from there on.
 	 */
-	nr++;
 	nr /= (PAGE_SIZE / 4 / sizeof(struct file *));
-	nr = roundup_pow_of_two(nr);
+	nr = roundup_pow_of_two(nr + 1);
 	nr *= (PAGE_SIZE / 4 / sizeof(struct file *));
 	if (nr > NR_OPEN)
 		nr = NR_OPEN;
-
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