Date: Wed, 13 Oct 2021 16:37:17 -0700 From: David Christensen <dpchrist@holgerdanske.com> To: questions@freebsd.org Subject: Re: cannot receive mountpoint property on data/backup/home/foo/bar: permission denied Message-ID: <f6b94418-b416-19b9-668b-a4ee2371d319@holgerdanske.com> In-Reply-To: <YWcGXYC6vyFFLKq3@ceres.zyxst.net> References: <YWcGXYC6vyFFLKq3@ceres.zyxst.net>
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On 10/13/21 9:16 AM, tech-lists wrote: > Hi > > I've tried searching for an authorative answer on this, but answers seem > to vary between Oracle-ZFS, FreeBSD-ZFS and OpenZFS, and nothing really > recent (context is recent stable/13) > > Using zfs send -R data/home/foo/bar@20211013 | pv | ssh > remote.system zfs recv -dvu data/backup What is 'pv'? Testing on a FreeBSD 12.2-RELEASE VirtualBox VM: 2021-10-13 15:35:55 toor@vf1 ~ # freebsd-version ; uname -a 12.2-RELEASE-p9 FreeBSD vf1.tracy.holgerdanske.com 12.2-RELEASE-p7 FreeBSD 12.2-RELEASE-p7 GENERIC amd64 2021-10-13 15:59:20 toor@vf1 ~ # zpool list | egrep 'NAME|vf1zpool' NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT vf1zpool1 960M 2.36M 958M - - 15% 0% 1.00x ONLINE - vf1zpool2 960M 1.25M 959M - - 6% 0% 1.00x ONLINE - 2021-10-13 15:58:54 toor@vf1 ~ # zfs create vf1zpool1/home 2021-10-13 15:59:13 toor@vf1 ~ # zfs create vf1zpool1/home/foo 2021-10-13 15:59:17 toor@vf1 ~ # zfs create vf1zpool1/home/foo/bar 2021-10-13 16:00:15 toor@vf1 ~ # echo "hello, world!" > /vf1zpool1/home/foo/bar/hello.txt 2021-10-13 16:01:36 toor@vf1 ~ # zfs snapshot -r vf1zpool1@20211012 2021-10-13 16:05:13 toor@vf1 ~ # echo "goodbye, cruel, world!" > /vf1zpool1/home/foo/bar/goodbye.txt 2021-10-13 16:06:31 toor@vf1 ~ # zfs snapshot -r vf1zpool1@20211013 2021-10-13 16:16:38 toor@vf1 ~ # zfs send -R vf1zpool1/home/foo/bar@20211013 | zfs recv -dvu vf1zpool2/backupcannot receive: specified fs (vf1zpool2/backup) does not exist Create the destination filesystem: 2021-10-13 16:17:54 toor@vf1 ~ # zfs create vf1zpool2/backup Try again: 2021-10-13 16:18:31 toor@vf1 ~ # zfs send -R vf1zpool1/home/foo/bar@20211013 | zfs recv -dvu vf1zpool2/backup receiving full stream of vf1zpool1/home/foo/bar@20211012 into vf1zpool2/backup/home/foo/bar@20211012 received 48.5KB stream in 1 seconds (48.5KB/sec) receiving incremental stream of vf1zpool1/home/foo/bar@20211013 into vf1zpool2/backup/home/foo/bar@20211013 received 10.2KB stream in 1 seconds (10.2KB/sec) 2021-10-13 16:18:45 toor@vf1 ~ # zfs list -r -t all vf1zpool2 NAME USED AVAIL REFER MOUNTPOINT vf1zpool2 1.52M 830M 88K /vf1zpool2 vf1zpool2/backup 456K 830M 96K /vf1zpool2/backup vf1zpool2/backup/home 360K 830M 96K /vf1zpool2/backup/home vf1zpool2/backup/home/foo 264K 830M 96K /vf1zpool2/backup/home/foo vf1zpool2/backup/home/foo/bar 168K 830M 112K /vf1zpool2/backup/home/foo/bar vf1zpool2/backup/home/foo/bar@20211012 56K - 100K - vf1zpool2/backup/home/foo/bar@20211013 0 - 112K - 2021-10-13 16:19:03 toor@vf1 ~ # mount | grep vf1zpool | sort vf1zpool1 on /vf1zpool1 (zfs, local, nfsv4acls) vf1zpool1/home on /vf1zpool1/home (zfs, local, nfsv4acls) vf1zpool1/home/foo on /vf1zpool1/home/foo (zfs, local, nfsv4acls) vf1zpool1/home/foo/bar on /vf1zpool1/home/foo/bar (zfs, local, nfsv4acls) vf1zpool2 on /vf1zpool2 (zfs, local, nfsv4acls) vf1zpool2/backup on /vf1zpool2/backup (zfs, local, nfsv4acls) vf1zpool2/backup/home on /vf1zpool2/backup/home (zfs, local, nfsv4acls) vf1zpool2/backup/home/foo on /vf1zpool2/backup/home/foo (zfs, local, nfsv4acls) The replication worked. Note that the replica leaf directory 'bar' is not mounted, but its parents are; per the zfs receive -u option. If I try to replicate again: 2021-10-13 16:19:29 toor@vf1 ~ # zfs send -R vf1zpool1/home/foo/bar@20211013 | zfs recv -dvu vf1zpool2/backup cannot receive new filesystem stream: destination 'vf1zpool2/backup/home/foo/bar' exists must specify -F to overwrite it warning: cannot send 'vf1zpool1/home/foo/bar@20211012': signal received warning: cannot send 'vf1zpool1/home/foo/bar@20211013': Broken pipe That failed, as it should; but not with the error message you are seeing (below). > I can see it completes the > sending of the snapshot but I'll see this as it just finishes, at the > sending systems term: > > cannot receive mountpoint property on data/backup/home/foo/bar > > Is this just because the data/backup/home/foo/bar filesystem was mounted > on the sending system, and the snapshot inherited it? > In which case I guess it can be ignored? because I don't want it > mounted at the receiving end (it wasn't mounted at the receiving end) > > For the received snapshot, all I care about is to be able to mount it > should I need it. But I won't usually need it. > > thanks, Do you see the replica on the receiving system? E.g.: # ssh remote.system zfs list -r -t all data/backup/home David
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