Hi Chip,

What do you mean by "controlling zfs"?  The answer to your question
will depend on your requirements.  If you're looking to do anything beyond
checking dataset existence, creating datasets[1], snapshot,
clone, destroying snaps, send, receive, rollback[2], managing bookmarks, or
managing holds, you're going to find libzfs_core lacking.

At my last gig, I built a C++ abstraction layer on top of libzfs_core,
libzfs, and libzpool, preferring the _core interfaces wherever
extant (since they are MT-safe).  If you're willing to deal with the
complexity of libzfs and libzpool, it's possible to build quite complex
pool and dataset management applications in C/C++ on top of the zfs apis
(we were building an async replicated geographically distributed object
store for a DR product.)

Cheers,

-Tom

[1] (NB: for zpl, lzc_create does not imply mount -- after all, this
involves a complicated sequence of vfs ops that should be done separately
by the user in the sequence desired)

[2] as with [1], only the dsl layer stuff: no vfs ops are performed

On Wednesday, August 31, 2016, Schweiss, Chip <[email protected]
<javascript:_e(%7B%7D,'cvml','[email protected]');>> wrote:

> What is the status of libzfs_core?   I haven't seen any chatter on it in a
> while.
>
> Is this the recommended way for building applications that will control
> ZFS directly or should I be looking at other approaches?
>
> Thanks!
> -Chip
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-- 
Tom Keiser
[email protected]



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