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remove process and jail directory machinations from dounmount

Description

remove process and jail directory machinations from dounmount

The manipulations done by mountcheckdirs() are not that useful during
the unmount, they can bring about unexpected security consequences.

Thic change effectively reverts the change in r73241.

The change also allows to simplify the handling of rootvnode global
variable.

Discussed with: mckusick, mjg, kib
Reviewed by: trasz
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D12366

Details

Provenance
avgAuthored on
Reviewer
trasz
Differential Revision
D12366: remove process and jail directory machinations from dounmount
Parents
rS324590: i2c(8): clean up and clarify read operation
Branches
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Tags
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