Re: Is jdm_delete_filehandle part of a public API?

[Mark Tinguely <tinguely@sgi.com>]

On 07/29/14 13:18, Mark Tinguely wrote:
> On 07/29/14 12:31, Eric Sandeen wrote:
>> I was cleaning up xfsprogs to plug some leaks, and wanted to use
>> jdm_delete_filehandle(). I noticed that it has an "hlen" argument which
>> is unused.
>>
>> Can we remove that, or is this part of a public API? It's not in any
>> manpage (or even called anywhere in xfsprogs/xfstests/xfsdump/dmapi)
>> but it is in a public header...
>>
>> anyone know?
>>
>> If needed I guess I can just call it with hlen==0, but that seems odd.
>>
>> Thanks,
>> -Eric
>
> The first thing that comes to mind is maybe they trying to distinguish
> between a fshandle or handle. Or they we trying to be consistent with
> the allocation calls.
>
> The libhandle free_handle has the same calling parameters. It also does
> nothing with the length. That we cannot change without breaking existing
> code.
>
> I will look/ask around.
>
> --Mark.

Looks like the code is pretty sloppy with freeing the handles.

Best guess is jdm_delete_filehandle() and  free_handle are trying to 
keep the API similar to DMAPI. The DMAPI handle free routine, 
dm_handle_free(), also has a second length parameter that is not used in 
the library.

The code example that I saw are similar to the use in xfsdump, where the 
length used in the free comes from the handle creation/conversion routine.

Since the xfsprogs do not open handles with calls that provide a length. 
How about FSHANDLE_SZ and FILEHANDLE_SZ depending on if it is a 
xfs_fshandle or xfs_handle?

--Mark.

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