Re: Can ReiserFS solve this?

[Hans Reiser <reiser@namesys.com>]

Erik Terpstra wrote:

> Hi,
>
> I am looking for a solution for the following problem:
>
> On a legacy system for newspaper workflow, files are delivered to a 
> certain directory (for example ~/input).
> These files (in TIFF format) can be quite large (10 to 400 MB), they 
> could be copied over the local filesystem, a Samba share or via FTP.
> When large files are copied over the network these files show up in 
> ~/input while they are being copied (you can see the filesize grow).
>
> However TIFF files are only useful for further processing when they 
> are complete.
>
> Initially we solved this problem by monitoring the input directory and 
> make our applications look at the files until they stop growing, but 
> this isn't a very elegant and reliable method.
>
> After a while we discovered the UNIX 'fuser' command so that we could 
> see if the incoming file is still being transferred or not.
> This works fine but it's still not very elegant, and it requires root 
> privileges for the applications involved in the workflow.
>
> Naturally, the best solution would be for the sender to notify the 
> completion of the transfer. But this is not an option because several 
> organizations are involved that do not wish to adapt their software.
>
> Right now I am wondering if this is something that could be solved on 
> the filesystem level, i.e. is it possible to 'only see files that are 
> not in the process of being transferred'.
>
> Is this possible with Reiser3? Reiser4? Should it be solved on the 
> filesystem level?
>
> Any thoughts on this matter are appreciated.
>
> Kind regards,
>
>   Erik Terpstra.
>
>
>
Is there a test for completeness of the tiff?  It could be done as a 
reiser4 plugin.

-- 
Hans