tree 3aef2007f7a60a820066cd3c1203d66bb3eee810
parent 65d8eb5a8f5480756105173de147ef5d60163e2f
author Al Viro <viro@zeniv.linux.org.uk> 1519441894 -0500
committer Al Viro <viro@zeniv.linux.org.uk> 1522350462 -0400

split the slow part of lock_parent() off

Turn the "trylock failed" part into uninlined __lock_parent().

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>