7645d04974
- don't hold the parent directory vnode locked while traversing mount points. the fs that's mounted might be an NFS served by a userland process like the automounter, which might need to traverse the parent directory in order to complete the lookup. - in the ENAMETOOLONG case fixed in rev. 1.75, set ni_dvp to dp since we've logically moved on to using "dp" as the parent. the caller will then handle vput()ing it as normal. this fixes PR 35279.