stripe width sized chunks. A new fstab/mount option,
"swalloc" has been defined. If specified when mounting
a striped file system, allocation requests will be
rounded up to a stripe width if the file size is >= stripe
width, and the data is being appended to eof. The
'swalloc' option is "off" by default.

SGI Modid: xfs-linux:xfs-kern:171710a