Re: [fuse-devel] [PATCH 0/5] fuse: close file synchronously (v2)

[John Muir]

On 2014.06.09, at 9:50 , Maxim Patlasov <mpatlasov@xxxxxxxxxxxxx> wrote:

> On 06/06/2014 05:51 PM, John Muir wrote:
>> On 2014.06.06, at 15:27 , Maxim Patlasov <mpatlasov@xxxxxxxxxxxxx> wrote:
>> 
>>> The patch-set resolves the problem by making fuse_release synchronous:
>>> wait for ACK from userspace for FUSE_RELEASE if the feature is ON.
>> Why not make this feature per-file with a new flag bit in struct fuse_file_info rather than as a file-system global?
> 
> I don't expect a great demand for such a granularity. File-system global "close_wait" conveys a general user expectation about filesystem behaviour in distributed environment: if you stopped using a file on given node, whether it means that the file is immediately accessible from another node.
> 

By user do you mean the end-user, or the implementor of the file-system? It seems to me that the end-user doesn't care, and just wants the file-system to work as expected. I don't think we're really talking about the end-user.

The implementor of a file-system, on the other hand, might want the semantics for close_wait on some files, but not on others. Won't there be a performance impact? Some distributed file-systems might want this on specific files only. Implementing it as a flag on the struct fuse_file_info gives the flexibility to the file-system implementor.

Regards,

John.

--
John Muir - john@xxxxxxxxx
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