Module Name:    src
Committed By:   hannken
Date:           Mon Jul 17 09:22:36 UTC 2017

Modified Files:
        src/sys/fs/union: union.h union_subr.c

Log Message:
Make union_newlower() ans union_newupper() local to union_subr.c,
expand and remove union_updatevp() and take care to transfer the
vnode lock from the union vnode to its new upper vnode without
breaking the fstrans state.

Add assertions that un_lowervp and un_uppervp never change from
non-NULL to non-NULL.

To generate a diff of this commit:
cvs rdiff -u -r1.28 -r1.29 src/sys/fs/union/union.h
cvs rdiff -u -r1.75 -r1.76 src/sys/fs/union/union_subr.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

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