linux-kernel - [PATCH 2/5] tmpfs: mpol=bind:0 don't cause mount error.

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Date:	Tue, 16 Mar 2010 14:50:18 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	kosaki.motohiro@...fujitsu.com, kiran@...lex86.org,
	cl@...ux-foundation.org, hugh.dickins@...cali.co.uk,
	lee.schermerhorn@...com, mel@....ul.ie, stable@...nel.org,
	linux-mm <linux-mm@...ck.org>, akpm@...ux-foundation.org
Subject: [PATCH 2/5] tmpfs: mpol=bind:0 don't cause mount error.

Currently, following mount operation cause mount error.

% mount -t tmpfs -ompol=bind:0 none /tmp

Because commit 71fe804b6d5 (mempolicy: use struct mempolicy pointer in
shmem_sb_info) corrupted MPOL_BIND parse code.

This patch restore the needed one.

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Ravikiran Thirumalai <kiran@...lex86.org>
Cc: Christoph Lameter <cl@...ux-foundation.org>
Cc: Mel Gorman <mel@....ul.ie>
Cc: Lee Schermerhorn <lee.schermerhorn@...com>
Cc: Hugh Dickins <hugh.dickins@...cali.co.uk>
Cc: <stable@...nel.org>
---
 mm/mempolicy.c |   10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 25a0c0f..3f77062 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -2220,9 +2220,13 @@ int mpol_parse_str(char *str, struct mempolicy **mpol, int no_context)
 		if (!nodelist)
 			err = 0;
 		goto out;
-	/*
-	 * case MPOL_BIND:    mpol_new() enforces non-empty nodemask.
-	 */
+	case MPOL_BIND:
+		/* 
+		 * Insist on a nodelist
+		 */
+		if (!nodelist)
+			goto out;
+		err = 0;
 	}
 
 	mode_flags = 0;
-- 
1.6.5.2



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