Re: Freeze the FUSE on Wubi

[Nigel Cunningham <ncunningham@crca.org.au>]

Hi.

Nick Davies wrote:
>> Hi.
>>
>> Stefan Seyfried wrote:
>>> On Fri, 16 Oct 2009 01:54:10 -0700 (PDT)
>>> Nick Davies wrote:
>>>
>>>> Dear all,
>>>>
>>>>    I am trying to debug the suspend/hibernate on Wubi(The Ubuntu
>>>> installer for Windows) these day. Since Ubuntu sits on top of NTFS
>>>> partition with the help of ntfs-3g via FUSE, I think it should not
>>>> pass the file system freezing stage, but in fact, the suspend works
>>>> well on my machine. So  I am curious that how can they achieve that?
>>>> Just keep the FUSE alive to the end of the suspend? Any ideas are
>>>> welcome.
>>> (Disclaimer: all below is AFAIK and it might be slightly wrong)
>>> On swapon(), a block map of the file / partition is made by the kernel
>>> and later I/O to the swap area are not going through the filesystem
>>> layer. So FUSE is not involved in the suspend process at the stage of
>>> image writing.
>> It's exactly right.
> Hi,
> 
>   Thanks for all your quick response. That is to say, the suspend itself has no conflict with the FUSE when do the freezing?
>   
> To Nigel,
>   I've tried the TuxOnIce project, unfortunately I can't do suspend now. According to the dmesg log, it hangs at the freezing file system. 
>   I check some codes of your patch. You've patched freeze_filesystems() to the fs/buffer.c file, so I guess there may be something wrong with the freeze order in that subroutine with my situation(OS sits on top of NTFS using ntfs-3g via FUSE). How your opinions?

Hmm. That's interesting - I'd expect things to be the other way around.

Can you provide the dmesg?

Regards,

Nigel