Date: Fri, 24 Nov 2023 15:02:42 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Alexander Leidinger <Alexander@leidinger.net> Cc: Rick Macklem <rmacklem@freebsd.org>, src-committers@freebsd.org, dev-commits-src-all@freebsd.org, dev-commits-src-main@freebsd.org Subject: Re: git: f5f277728ade - main - nfsd: Fix NFS access to .zfs/snapshot snapshots Message-ID: <ZWCe8k_lxWSpDA1L@kib.kiev.ua> In-Reply-To: <987d4593d50b9cbffb9b6443d3825499@Leidinger.net> References: <202311231525.3ANFPBo6039293@gitrepo.freebsd.org> <987d4593d50b9cbffb9b6443d3825499@Leidinger.net>
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On Fri, Nov 24, 2023 at 08:50:22AM +0100, Alexander Leidinger wrote: > Am 2023-11-23 16:25, schrieb Rick Macklem: > > The branch main has been updated by rmacklem: > > > > URL: https://cgit.FreeBSD.org/src/commit/?id=f5f277728adec4c5b3e840a1fb16bd16f8cc956d > > > > commit f5f277728adec4c5b3e840a1fb16bd16f8cc956d > > Author: Rick Macklem <rmacklem@FreeBSD.org> > > AuthorDate: 2023-11-23 15:23:33 +0000 > > Commit: Rick Macklem <rmacklem@FreeBSD.org> > > CommitDate: 2023-11-23 15:23:33 +0000 > > > > nfsd: Fix NFS access to .zfs/snapshot snapshots > > > > When a process attempts to access a snapshot under > > /<dataset>/.zfs/snapshot, the snapshot is automounted. > > However, without this patch, the automount does not > > set mnt_exjail, which results in the snapshot not being > > accessible over NFS. > > > > This patch defines a new function called vfs_exjail_clone() > > which sets mnt_exjail from another mount point and > > then uses that function to set mnt_exjail in the snapshot > > automount. A separate patch that is currently a pull request > > for OpenZFS, calls this function to fix the problem. > > May the same/similar fix like for ZFS be needed / useful for nullfs mounted > stuff? > > I have a ZFS dataset which is mounted via nullfs into a jail. This > nullfs-mount is then exported via samba. In samba I have the shadow-copy > stuff enabled, but it doesn't work, as the jails can't access the snapshot. Jails cannot access snapshots because, as I understand, snapshots are mounts. Nullfs does not provide an option to recursively bypass into mounts. The patch you responded to does not automatically mounts snapshots on clients, it only allows them to mount if wanted. You might try to set up something with autofs, no idea if it could be made to work usefully.
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