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gmultipath: make physpath distinct from the underlying providers'

zfsd uses a device's physical path attribute to automatically replace a
missing ZFS disk when a blank disk is inserted into the same

gmultipath: make physpath distinct from the underlying providers'

zfsd uses a device's physical path attribute to automatically replace a
missing ZFS disk when a blank disk is inserted into the same physical
slot. Currently gmultipath passes through its underlying providers'
physical path attribute. That may cause zfsd to replace a missing
gmultipath provider with a newly arrived, single-path disk. That would
be bad.

This commit fixes that problem by simply appending "/mp" to the
underlying providers' physical path, in a manner similar to what geli
already does.

Sponsored by: Axcient
MFC after: 3 weeks
Differential Revision: https://reviews.freebsd.org/D29941

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Fix the sys.geom.class.multipath.misc.fail_on_error test on stable/12

This test uses a gnop feature (delay probability) that isn't available on
stable/12. But it's unnecessary; the test works fine

Fix the sys.geom.class.multipath.misc.fail_on_error test on stable/12

This test uses a gnop feature (delay probability) that isn't available on
stable/12. But it's unnecessary; the test works fine without it. Removing
it simplifies the test and, once MFCed, will allow it to pass on stable/12.

PR: 244158
Reported by: lwhsu
MFC after: 2 weeks

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gmultipath: add ATF tests

Add ATF tests for most gmultipath operations. Add some dtrace probes too,
primarily for configuration changes that happen in response to provider
errors.

PR: 178473
MFC a

gmultipath: add ATF tests

Add ATF tests for most gmultipath operations. Add some dtrace probes too,
primarily for configuration changes that happen in response to provider
errors.

PR: 178473
MFC after: 2 weeks
Sponsored by: Axcient
Differential Revision: https://reviews.freebsd.org/D22235

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