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Fix move handling of zvol devices out of txg sync thread
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Authored by anthoine.bourgeois_blade-group.com on Mar 12 2018, 7:22 PM.

Details

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avg
pjd
smh
Group Reviewers
ZFS
Summary

This revision fix the D7179 revision.

The patch is rebase on current and a queue applies all changes
in order between concurrent zfs rename and promote.

The queue protected by a mutex uses a condvar to wait for other
dataset changes to finish and keep order between calls.

PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203864

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rS FreeBSD src repository - subversion
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