Date: Wed, 27 Feb 2019 09:12:13 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Cy Schubert <Cy.Schubert@cschubert.com> Cc: Baptiste Daroussin <bapt@freebsd.org>, src-committers <src-committers@freebsd.org>, svn-src-head@FreeBSD.ORG, Jack Halford <jack@gandi.net> Subject: Re: svn commit: r344569 - in head/cddl/contrib/opensolaris: cmd/zfs lib/libzfs/common Message-ID: <0563e72c-c9e3-a476-ce43-d4a67c454508@FreeBSD.org> In-Reply-To: <201902262058.x1QKwvJn018213@slippy.cwsent.com> References: <201902262058.x1QKwvJn018213@slippy.cwsent.com>
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On 26/02/2019 22:58, Cy Schubert wrote: > I was talking about nested datasets, i.e. tank/freebsd/git/current and > tank/freebsd/git/ports are four levels deep. We usually don't call them "nested". In fact, I don't think that we call them anything special because having N levels deep datasets (N > 1) is just a common thing. We may call them subordinate or child datasets when mentioning a relation to a parent dataset. > In my case the ports > dataset was mounted while the current dataset was not, though zfs > believed it was. unmounting the current dataset and remounting it, zfs > umount .../current; zfs mount .../current worked around the issue. Are you sure that it was not mounted? Have you checked that by looking at mount output? I suspect that it was mounted, just not where you expected and its mount path was covered by another filesystem. E.g., lets consider this hypothetical case. I have two same level datasets tank/freebsd/src and tank/freebsd/sys where tank/freebsd/src is mounted at /usr/src and tank/freebsd/sys is mounted at /usr/src/sys (a child directory of /usr/src). If tank/freebsd/src is mounted first, then everything is okay, tank/freebsd/sys would be mounted on top of sys directory in tank/freebsd/src. If, however, tank/freebsd/sys is mounted first (assuming that path /usr/src/sys exists in a root filesystem), then mounting tank/freebsd/src would simply hide tank/freebsd/sys "below" it as /usr/src/sys would be sys directory in tank/freebsd/src. I guess that this is a kind of problem that could be introduced with parallel mounting. And I guess that this is a kind of problem that you might actually have. But it's just a guess. -- Andriy Gapon
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