Re: [9fans] file server trouble

[forsyth@vitanuova.com]

normally, if you recover to a dump, it should be fine, BUT
the system now needs to account for the fact that you've
used more blocks with a partially-attempted dump.
it needs to set the basis for future allocations to
the base of the unwritten material.  that's what the commented line does.
(see cwgrow.)

actually, what it ought to do instead of guessing that 100 will be enough
is to trundle down the blocks from where it thinks it can start
until it finds an unwritten block.  it can tell that.
i've got something like it somewhere; i needed
to copy an fworm to a worm.
	from = f1->dev;
	if(from->type == Devcw)
 		from = from->cw.w;
	devinit(from);
 	/* find last valid block in case fworm */
 	lim = devsize(from);
 	for(;;){
 		if(lim == 0)
			panic("no blocks to copy on %D", from);
 		p = getbuf(from, lim-1, Bread);
		if(p){
			putbuf(p);
 			break;
		}
		lim--;
	}
	print("limit %ld\n", lim);

h->fsize should be set to lim+1