[OT] file with holes

[Άγγελος Οικονομόπουλος]

On Monday 20 May 2002 19:54, Giorgos Keramidas wrote:
> On 2002-05-20 15:30, Άγγελος Οικονομόπουλος wrote:
> > Pws 8a mporousa na antigrapsw ena file with holes apo ena (unix)
> > filesystem se ena allo, kratwntas ta holes? to dump e3aireitai :)
> > Apo oso to exw psa3ei (oxi kai toso polu) kati tetoio einai adunato
> > me ta uparxonta syscalls. Can somebody prove me wrong?
>
> Xoris na exeis prosbash sto idio to filesystem layer, kai na blepeis
> poia i-nodes katalambanei ena arxeio kai poia data blocks, den mporo
> na skefto kapoio eukolo tropo na jereis an kapoio block apo mhdenika
> einai ontws block apo mhdenika h ena hole.

apo ena grhgoro koitagma ston phruna, _mallon_ den uparxei tropos. auto 
einai kai to anamenomeno, mias pou den fainetai na uparxei xrhsimothta gia 
kati tetoio (very weird cases aside)

[snip]
> A, nai.  Den ton exo dokimasei ton kwdika.  Mporei oute compile na min
> kanei.  H genikh idea einai pou thelo na grapso.  "Antigrafoume ta
> panta, ektos apo ta mhdenika.  Otan brei mhdenika, kai einai pano apo
> `minhole' sunexomena mhdenika, tote ftiaxnei ena hole.  Allios ta
> antigrafei san kanonika mhdenika."

kai egw auto skefthka san lush sthn arxh (dedomenou oti exw mia idea gia to 
minholesize, oxi oti paizei megalo rolo). alla lambanontas upopsh kai ta 
praktika problhmata ((accidental copy || normal backup || whatever) fills 
filesystem) nomizw oti 8a htan pio praktiko na ta dhmiourgeis se ena 
filesystem image (h douleia gia thn opoia ta 8elw apaitei outws h allws 
root privileges) pou thn antigrafeis, sumpiezeis, krubeis sto surtari, 
xrhsimopoieis gia na pai3eis tennis klp

-- 
Keep it simple to make it faster.
            - The Elements of Programming Style (Kernighan & Plaugher)