[Bug 253227] zfs does not respect snapshot_limit (at least for volumes)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253227

            Bug ID: 253227
           Summary: zfs does not respect snapshot_limit (at least for
                    volumes)
           Product: Base System
           Version: 12.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: misc
          Assignee: bugs at FreeBSD.org
          Reporter: walter.von.entferndt at posteo.net

This is very bad for periodic snapshot taking...  I have checked
$ zpool get all | fgrep feature at filesystem_limits
t450s  feature at filesystem_limits      active                         local

but
# zfs snapshot -r t450s@`date -u +%F-%T-%Z`
$ zfs get -r snapshot_count,snapshot_limit t450s/SWAP
NAME                                PROPERTY        VALUE    SOURCE
t450s/SWAP                          snapshot_count  1        local
t450s/SWAP                          snapshot_limit  0        local
t450s/SWAP at 2021-02-03-19:03:42-UTC  snapshot_count  -        -
t450s/SWAP at 2021-02-03-19:03:42-UTC  snapshot_limit  -        -

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