[Bug 291301] statfs() no longer reporting statfs.f_fsid in jails

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291301

            Bug ID: 291301
           Summary: statfs() no longer reporting statfs.f_fsid in jails
           Product: Base System
           Version: 14.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: standards
          Assignee: [email protected]
          Reporter: [email protected]

As of FreeBSD 14.3, the statfs() call in jails seems to always return empty
(zeroed) statfs.f_fsid, specifically for zfs datasets managed (created and
mounted) by the jail.

This used to work fine (ie. an actual value was returned in `statfs.f_fsid`) in
FreeBSD 14.2 jails with enforce_statfs=1.

I have tested on FreeBSD 14.3 with both enforce_statfs=1 and enforce_statfs=0,
and the returned value is always zeroed.

This is quite annoying for software that needs to gather available/used disk
space among available mountpoints.

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