Re: Question related to XFS sync , especially fsync

["Gopala Krishna" <gopalakrishna.n.m@xxxxxxxxx>]

Thank you Chris.
While  replying  to Eric, I mentioned why we are doing that. We are
basically providing interfaces to back up applications in a pure storage
environment that deals with the  back up at block level (sector level) and
hence depending upon different file system, we need to get information about
file like it's extent information and associated block numbers etc. To
extract these there is no system call and hence we are depending on disk
layout published by file system vendors and the header file provided by
them.
If there is a user level system call to deal with the extent information
etc, we can use , but many file system is not providing that. Basically if
we give file it should eb in aposition to display metadata informations
including extents and corresponding logical block numbers and device
offsets.

I have to do it programitically and hence if I have some system call rather
than command, that would be helpful. Freeze/unfreeze is a command it seems
right?

Thanks,
Gopal.





On 1/16/08, Chris Wedgwood <cw@xxxxxxxx> wrote:
>
> On Wed, Jan 16, 2008 at 12:13:54PM +0530, Gopala Krishna wrote:
>
> > Is there any XFS call from user level to flush metadata for a given
> > file or complete log to disk?
>
> like a said earlier, try freeze/unfreeze
>
> you've not explained what you're doing (well, why you're doing it)
>
> it sounds very problematic by design
>


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