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zfs: fix EIO accessing dataset after resuming interrupted receive
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Authored by asomers on Aug 11 2020, 8:36 PM.

Details

Summary

zfs: fix EIO accessing dataset after resuming interrupted receive

ZFS unmounts a dataset while receiving into it and remounts it afterwards.
But if ZFS is resuming an incomplete receive, it screws up and ends up with
a dataset that is mounted, but returns EIO for every access. This commit
fixes that condition.

While the vulnerable code also exists in OpenZFS, the problem is not
reproducible there. Apparently OpenZFS doesn't unmount the destination
dataset during receive, like FreeBSD does.

PR: 248606

Test Plan

ZFS test suite, plus instructions attached to PR

Diff Detail

Repository
rS FreeBSD src repository
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Unit
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Build Status
Buildable 32927
Build 30325: arc lint + arc unit