Re: How to discover the volume id to use in a File Reference URL
Re: How to discover the volume id to use in a File Reference URL
- Subject: Re: How to discover the volume id to use in a File Reference URL
- From: Ken Thomases <email@hidden>
- Date: Tue, 24 Sep 2013 17:05:09 -0500
On Sep 24, 2013, at 4:55 PM, Charles Srstka wrote:
> On Sep 24, 2013, at 4:47 PM, Ken Thomases <email@hidden> wrote:
>
>> I was not aware of those limitations. Thanks for enlightening me. It looks, though, like you could reconstruct a path by working your way back from the item through its ancestors, getting each name along the way, using ATTR_CMN_NAME and ATTR_CMN_PARENTID. Not graceful, but should work.
>
> Is there a way to get those attributes of the parent without doing searchfs() all over again?
No, I don't expect so.
> Because if you had to do an entire drive search for every ancestor, that would quite likely take a *long* time to complete.
I don't think that searchfs() _necessarily_ does a true full-drive search. Given a unique file ID (ATTR_CMN_FILEID) in the search criteria, the file system implementation could very well return in constant time. As I said earlier, logically it could be as fast as resolving a file reference URL to a file path URL, since that's what that amounts to.
That said, I haven't investigated either by reading the source or by running tests.
Regards,
Ken
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