mjg 7555f0f24e vfs: fully hold vnodes in vnlru_free_locked
Currently the code only bumps holdcnt and clears the VI_FREE flag, not
performing actual vhold. Since the vnode is still visible elsewhere, a
potential new user can find it and incorrectly assume it is properly held.

Use vholdl instead to correctly hold the vnode. Another place recycling
(vlrureclaim) does this already.

Reviewed by:	kib
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D21522
2019-09-04 19:23:18 +00:00
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