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Permit vm_pager_has_page() to run with a shared lock. Introduce

Description

Permit vm_pager_has_page() to run with a shared lock. Introduce
VM_OBJECT_DROP/VM_OBJECT_PICKUP to handle functions that are called with
uncertain lock state.

Reviewed by: kib, markj
Tested by: pho
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D21310

Details

Committed
jeffMon, Aug 19, 10:25 PM
Reviewer
kib
Differential Revision
D21310: Allow calls to vm_pager_haspages with the object read locked
Parents
rS351234: MFC 348874: Remove an overly-aggressive assertion.
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