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The d_instantiate hook for Smack can hang on the root inode of a filesystem if the file system code has not really done all the set-up. Fuse is known to encounter this problem. This change detects an attempt to instantiate a root inode and addresses it early in the processing, before any attempt is made to do something that might hang. Signed-off-by: Casey Schaufler <casey@schaufler-ca.com> Tested-by: Luiz Fernando N. Capitulino <lcapitulino@mandriva.com.br> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>