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List:       fuse-devel
Subject:    Re: [fuse-devel] [Q] Fuse callback sequence
From:       Miklos Szeredi <miklos () szeredi ! hu>
Date:       2011-08-08 15:26:41
Message-ID: 87sjpbexfy.fsf () tucsk ! pomaz ! szeredi ! hu
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Emalayan Vairavanathan <svemalayan@yahoo.com> writes:

> Hi Devs,
>
> I wrote a distributed file system using fuse. I am now testing it with
> POSIX benchmarks to assess POSIX compatibility. But the entire
> benchmark suite is failing.
>
>
> I investigated further and found the following sequence of fuse_call
> backs were generated at some point by benchmark .
>
> - mknod()
> - open(READ_ONLY)
> - flush(READ_ONLY)
> - release()
>
> I designed the file system assumeing an open(WRITE) / open(READ-WRITE)
> immediately follows a mknod().
>
> So my file system does not updates the metadata server in mknod() call
> back. It updates the metadata only in write-open / read-write open
> calls. So an open(READ_ONLY) call immediately follows mknod() always
> fails.

In addition to ->mknod() and ->open() you should implement the
->create() callback, which is an atomic combination of mknod and open.

>  Until now I was testing the file system with various
> applications (such as tar, gzip, and some complex applications) and
> both the file system and applications were working fine.
>
> Could anyone tells whether my assumption about fuse call-back sequence
> is correct or not ?
>
> Also please tell me a simple C program which might generate the same
> sequence of callback as mentioned above ?

	open("/mnt/fuse/nonexistent-file", O_RDONLY | O_CREAT, 0777);

Thanks,
Miklos

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