[Bug 275200] NFS mounts cannot access ZFS snapshots in /<dataset>/.zfs

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275200

            Bug ID: 275200
           Summary: NFS mounts cannot access ZFS snapshots in
                    /<dataset>/.zfs
           Product: Base System
           Version: 14.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: rmacklem@FreeBSD.org

Created attachment 246422
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=246422&action=edit
Set mnt_exjail for an automounted ZFS snapshot

Commit 88175af added a check for exported to
correct jail, using a new mount field called
mnt_exjail.  This field is filled in when a
file system is exported.

Unfortunately, this filed is not filled in
when /<dataset>/.zfs/snapshot/<snapshit-name>
is automounted.  As a result, access to this
automounted snapshot is not allowed via NFS.

The attached patch, which sets mnt_exjail for
this case, seems to fix the problem.
This patch is now on phabricator as D42672.

I will leave this PR open until an errata
for FreeBSD 14.0 is done to fix the problem.

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