oh! nice!
that resolves all.
thanks a lot
i will try
On 2013/03/25, at 16:19, [email protected] wrote:
> the block bitmap on a fakeworm is at the end of the sub
> device/partition. see fworm.c:
>
> int
> fwormread(Device *d, Off b, void *c)
> {
> Iobuf *p;
> Device *fdev;
> Devsize l;
>
> if(chatty > 1)
> fprint(2, "fworm read %lld\n", (Wideoff)b);
> fdev = FDEV(d);
> l = devsize(fdev);
> l -= l/(BUFSIZE*8) + 1;
> if(b >= l)
> panic("fworm: rbounds %lld", (Wideoff)b);
> l += b/(BUFSIZE*8);
>
> p = getbuf(fdev, l, Brd|Bres);
> if(!p || checktag(p, Tvirgo, l))
> panic("fworm: checktag %lld", (Wideoff)l);
> l = b % (BUFSIZE*8);
> if(!(p->iobuf[l/8] & (1<<(l%8)))) {
> putbuf(p);
> fprint(2, "fworm: read %lld\n", (Wideoff)b);
> return 1;
> }
> putbuf(p);
> return devread(fdev, b, c);
> }
>
> the block tags do not really matter for the backup. you use the
> fakeworm only as a backend for the cw device so you can just
> copy all the blocks that got ther bit set in the bitmap compared
> to the backup.
>
> --
> cinap
>
