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authorHugh Dickins <hughd@google.com>2012-05-29 15:06:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-29 16:22:22 -0700
commit2f6e38f3cd17a7858112f538c1700c747170db1f (patch)
tree894181551acd46caea34ff2b3fba13ffd049fcbd /mm/shmem.c
parentbde05d1ccd512696b09db9dd2e5f33ad19152605 (diff)
downloadop-kernel-dev-2f6e38f3cd17a7858112f538c1700c747170db1f.zip
op-kernel-dev-2f6e38f3cd17a7858112f538c1700c747170db1f.tar.gz
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@google.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Andi Kleen <andi@firstfloor.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index db72d8e..fe5ae69 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2373,6 +2373,7 @@ int shmem_fill_super(struct super_block *sb, void *data, int silent)
}
}
sb->s_export_op = &shmem_export_ops;
+ sb->s_flags |= MS_NOSEC;
#else
sb->s_flags |= MS_NOUSER;
#endif
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