Re: Question related to XFS sync , especially fsync

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

You are right and that is the approach I will follow if there is no direct
system call.

Thanks,
Gopal.


On 1/16/08, Iustin Pop <iusty@xxxxxxxxx> wrote:
>
> On Wed, Jan 16, 2008 at 12:55:17PM +0530, Gopala Krishna wrote:
> > 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?
>
> Well, most commands are backed by a system call, right? For example,
> strace xfs_freeze to see what system calls it does. IIRC, only xfs_db
> has to access the raw device.
>
> For the block mapping, look at xfs_bmap (and its backend xfs_io), which
> should do exactly what you want.
>
> iustin
>


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