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MFC r278625: Make XCOPY and WUT commands respect physical block size/offset.

Description

MFC r278625: Make XCOPY and WUT commands respect physical block size/offset.

This change by 2-3 times improves performance of misaligned XCOPY and WUT
commands by avoiding unneeded read-modify-write cycles inside ZFS.

Details

Provenance
mavAuthored on
Parents
rS279003: MFC r278161: Bring some more order into iSCSI portal group tags support.
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