On Jun 05, 2008 11:40 +0100, Jamie Lokier wrote: > >From a database perspective, I'm thinking it would be very useful to > provide similar information for large files. Database engines have > the same requirement to know stripe width etc., and filesystems > allocate large contiguous extents so it it makes sense to pass the > device characteristics up to the app, with appropriate offset. > > (Same for loopback devices.) > > This is an extreme example of different properties in different offset > ranges - it depends on file allocation. > > Is there scope to extend FIEMAP to pass this sort of information? I have ideas in that direction, but have been gun-shy about presenting them until the existing controversy dies down... I think it is actually fairly straight forward to enhance FIEMAP to allow arbitrary file layouts to be returned to an application. Cheers, Andreas -- Andreas Dilger Sr. Staff Engineer, Lustre Group Sun Microsystems of Canada, Inc. -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
