K 10
svn:author
V 3
mjg
K 8
svn:date
V 27
2020-01-24T07:44:25.235382Z
K 7
svn:log
V 581
vfs: stop unlocking the vnode upfront in vput

Doing so runs into races with filesystems which make half-constructed vnodes
visible to other users, while depending on the chain vput -> vinactive ->
vrecycle to be executed without dropping the vnode lock.

Impediments for making this work got cleared up (notably vop_unlock_post now
does not do anything and lockmgr stops touching the lock after the final
write). Stacked filesystems keep vhold/vdrop across unlock, which arguably can
now be eliminated.

Reviewed by:	jeff
Differential Revision:	https://reviews.freebsd.org/D23344

END