[Bug 235832] [FEATURE REQUEST] [ZFS] Add "-r" (recursive) option to zfs diff

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235832

            Bug ID: 235832
           Summary: [FEATURE REQUEST] [ZFS] Add "-r" (recursive) option to
                    zfs diff
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: stilezy at gmail.com

Imagine a zfs dataset (pool/mydata) with nested datasets
(pool/mydata/subdataNNN).

At present one can "snapshot -r pool/mydata" and it'l also snapshot all nested
datasets, and I imagine most users with nested datasets would do this.

But to check if anything has changed between snapshots, one cannot do "zfs diff
-r pool/mydata". The option is missing. One has to diff each sub-dataset
individually, which isn't intuitive or helpful.

Could -r be added to zfs diff?

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