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vfs: add vholdnz (for already held vnodes)

Description

vfs: add vholdnz (for already held vnodes)

Reviewed by: kib (previous version)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D21358

Details

Provenance
mjgAuthored on
Reviewer
kib
Differential Revision
D21358: nullfs: reduce areas protected by vnode interlock
Parents
rS351470: MFC r350880:
Branches
Unknown
Tags
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