On 04/24/2012 01:15 PM, Pádraig Brady wrote: >> With those changes, the affected files are then very compressible. >> > With some file system types/options, won't they occupy far fewer >> > blocks than before? > Good point. > The dd/sparse one could then fail the alloc check. > The fiemap-empty change is only 5120 bytes too.
Wouldn't -dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=unwritten.withdata +dd count=10 if=/dev/zero | sed 's/\(.\)./\1 /g' | dd conv=notrunc of=unwritten.withdata defeat the compression logic? Have a nice day, Berny
