[Bug 275965] periodic: add a daily zfs trim

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275965

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A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=493908c4b45c7b75e4a6b4aea3b5b63ea5c268d5

commit 493908c4b45c7b75e4a6b4aea3b5b63ea5c268d5
Author:     Lexi Winter <lexi@le-fay.org>
AuthorDate: 2024-04-09 21:49:56 +0000
Commit:     Warner Losh <imp@FreeBSD.org>
CommitDate: 2024-04-09 21:55:11 +0000

    periodic/daily/801.trim-zfs: Add a daily zfs trim script

    As mentioned in zpoolprops(7), on some SSDs, it may not be desirable to
    use ZFS autotrim because a large number of trim requests can degrade
    disk performance; instead, the pool should be manually trimmed at
    regular intervals.

    Add a new daily periodic script for this purpose, 801.trim-zfs.  If
    enabled (daily_trim_zfs_enable=YES; the default is NO), it will run a
    'zpool trim' operation on all online pools, or on the pools listed in
    'daily_trim_zfs_pools'.

    The trim is not started if the pool is degraded (which matches the
    behaviour of the existing 800.scrub-zfs script) or if a trim is already
    running on that pool.  Having autotrim enabled does not inhibit the
    periodic trim; it's sometimes desirable to run periodic trims even with
    autotrim enabled, because autotrim can elide trims for very small
    regions.

    PR:             275965
    MFC after:      1 week
    Reviewed by:    imp
    Pull Request:   https://github.com/freebsd/freebsd-src/pull/956

 share/man/man5/periodic.conf.5                    | 11 ++++-
 usr.sbin/periodic/etc/daily/801.trim-zfs (new +x) | 59 +++++++++++++++++++++++
 usr.sbin/periodic/etc/daily/Makefile              |  3 +-
 usr.sbin/periodic/periodic.conf                   |  5 ++
 4 files changed, 76 insertions(+), 2 deletions(-)

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