ocfs2: Block signals for mkdir/link/symlink/O_CREAT.
Once file or link creation gets going, it can't be interrupted by a
signal. They're not idempotent.
This blocks signals in ocfs2_mknod(), ocfs2_link(), and ocfs2_symlink()
once we start actually changing things. ocfs2_mknod() covers mknod(),
creat(), mkdir(), and open(O_CREAT).
Signed-off-by: NJoel Becker <joel.becker@oracle.com>
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