linux-kernel - [PATCH 2/10] tmpfs: enable NOSEC optimization

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Date:	Sat, 12 May 2012 05:02:29 -0700 (PDT)
From:	Hugh Dickins <hughd@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Al Viro <viro@...iv.linux.org.uk>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/10] tmpfs: enable NOSEC optimization

Let tmpfs into the NOSEC optimization (avoiding file_remove_suid()
overhead on most common writes): set MS_NOSEC on its superblocks.

Signed-off-by: Hugh Dickins <hughd@...gle.com>
---
 mm/shmem.c |    1 +
 1 file changed, 1 insertion(+)

--- 3045N.orig/mm/shmem.c	2012-05-05 10:45:17.888060878 -0700
+++ 3045N/mm/shmem.c	2012-05-05 10:46:05.732062006 -0700
@@ -2361,6 +2361,7 @@ int shmem_fill_super(struct super_block
 		}
 	}
 	sb->s_export_op = &shmem_export_ops;
+	sb->s_flags |= MS_NOSEC;
 #else
 	sb->s_flags |= MS_NOUSER;
 #endif
--
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