[Bug 274263] Access to zfs snapshots within a jail return EPERM after a while of operation

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=274263

--- Comment #6 from Andrew <andrew.hotlab@hotmail.com> ---
I just managed to find the solution while I was asking for help in this Matrix
room: #lobby:matrix-dev.freebsd.org

@dch pointed me to looking at jails parameters, and I discovered
"zfs.mount_snapshot", which was introduced by this upstream commit:
https://github.com/openzfs/zfs/pull/13758/files, and ported to FreeBSD by this
one:
https://cgit.freebsd.org/src/commit/sys/contrib/openzfs/module/os/freebsd/zfs/zfs_vfsops.c?id=dbd5678dc

You can find more info about this in Bug 260160, which I think this one can be
set the duplicate of.

Personally, I think that "zfs.mount_snapshot" deserves to be referenced in
jail(8), or maybe it should have been set to "1" by default, in order to
preserve the behavior of jails in pre-OpenZFS FreeBSD versions. Such a PR would
never have been created in both of cases.

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