Re: Question related to XFS sync , especially fsync

[David Chinner <dgc@xxxxxxx>]

On Thu, Jan 17, 2008 at 02:25:00AM +0100, Andi Kleen wrote:
> "Gopala Krishna" <gopalakrishna.n.m@xxxxxxxxx> writes:
> 
> > 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 
> 
> Actually there is the FIOBMAP ioctl for data blocks. e.g. it's used by
> boot loaders like lilo to create a block map to read a file without
> knowledge of the file system. Should work on all file systems that
> support lilo.

On XFS, you should use XFS_IOC_GETBMAPX. It's much faster
and returns lots more information than FIOBMAP. It can also
be used on the attribute fork of the inode, and it works on
directories as well.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group