Commits on Feb 11, 2020

1. implement bookmark copying …

   This feature allows copying existing bookmarks using
   ```
     zfs bookmark fs#target fs#newbookmark
   ```
   There are some niche use cases for such functionality,
   e.g. when using bookmarks as markers for replication progress.
   
   Copying redaction bookmarks produces a normal bookmark that
   cannot be used for redacted send (we are not duplicating
   the redaction object).
   
   ZCP support for bookmarking (both creation and copying) will be
   implemented in a separate patch based on this work.
   
   Overview:
   
   - Terminology:
       - source = existing snapshot or bookmark
       - new/bmark = new bookmark
   - Implement bookmark copying in `dsl_bookmark.c`
     - create new bookmark node
     - copy source's `zbn_phys` to new's `zbn_phys`
     - zero-out redaction object id in copy
   - Extend existing bookmark ioctl nvlist schema to accept
     bookmarks as sources
     - => `dsl_bookmark_create_nvl_validate` is authoritative
   - use `dsl_dataset_is_before` check for both snapshot
     and bookmark sources
   - Adjust CLI
     - refactor shortname expansion logic in `zfs_do_bookmark`
   - Update man pages
     - warn about redaction bookmark handling
   - Add test cases
     - CLI
     - pyyzfs libzfs_core bindings
   
   Signed-off-by: Christian Schwarz <me@cschwarz.com>

   

   problame committed Feb 11, 2020
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2. zcp: add zfs.sync.bookmark …

   supports bookmark creation and cloning
   
   Signed-off-by: Christian Schwarz <me@cschwarz.com>

   

   problame committed Feb 11, 2020
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