K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2019-12-08T21:13:07.551544Z
K 7
svn:log
V 710
vfs: clean up vputx a little

1. replace hand-rolled macros for operation type with enum
2. unlock the vnode in vput itself, there is no need to branch on it. existence
of VPUTX_VPUT remains significant in that the inactive variant adds LK_NOWAIT
to locking request.
3. remove the useless v_usecount assertion. few lines above the checks if
v_usecount > 0 and leaves. should the value be negative, refcount would fail.
4. the CTR return vnode %p to the freelist is incorrect as vdrop may find the
vnode with holdcnt > 1. if the like should exist, it should be moved there
5. no need to error = 0 for everyone

Reviewed by:	kib, jeff (previous version)
Differential Revision:	https://reviews.freebsd.org/D22718

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