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tmpfs: enable NOSEC optimization

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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>
This commit is contained in:
Hugh Dickins 2012-05-29 15:06:38 -07:00 committed by Linus Torvalds
parent bde05d1ccd
commit 2f6e38f3cd
1 changed files with 1 additions and 0 deletions
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mm/shmem.c
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@ -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