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#include "all.h"
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#define	FDEV(d)		((d)->fw.fw)
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enum { DEBUG = 0 };
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Devsize
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fwormsize(Device *d)
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{
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	Devsize l;
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	l = devsize(FDEV(d));
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	l -= l/(BUFSIZE*8) + 1;
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	return l;
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}
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void
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fwormream(Device *d)
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{
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	Iobuf *p;
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	Device *fdev;
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	Off a, b;
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	print("fworm ream\n");
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	devinit(d);
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	fdev = FDEV(d);
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	a = fwormsize(d);
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	b = devsize(fdev);
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	print("\tfwsize = %lld\n", (Wideoff)a);
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	print("\tbwsize = %lld\n", (Wideoff)b-a);
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	for(; a < b; a++) {
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		p = getbuf(fdev, a, Bmod|Bres);
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		if(!p)
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			panic("fworm: init");
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		memset(p->iobuf, 0, RBUFSIZE);
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		settag(p, Tvirgo, a);
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		putbuf(p);
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	}
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}
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void
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fworminit(Device *d)
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{
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	print("fworm init\n");
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	devinit(FDEV(d));
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}
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int
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fwormread(Device *d, Off b, void *c)
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{
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	Iobuf *p;
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	Device *fdev;
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	Devsize l;
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	if(DEBUG)
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		print("fworm read  %lld\n", (Wideoff)b);
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	fdev = FDEV(d);
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	l = devsize(fdev);
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	l -= l/(BUFSIZE*8) + 1;
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	if(b >= l)
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		panic("fworm: rbounds %lld", (Wideoff)b);
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	l += b/(BUFSIZE*8);
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	p = getbuf(fdev, l, Brd|Bres);
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	if(!p || checktag(p, Tvirgo, l))
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		panic("fworm: checktag %lld", (Wideoff)l);
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	l = b % (BUFSIZE*8);
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	if(!(p->iobuf[l/8] & (1<<(l%8)))) {
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		putbuf(p);
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		print("fworm: read %lld\n", (Wideoff)b);
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		return 1;
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	}
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	putbuf(p);
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	return devread(fdev, b, c);
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}
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int
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fwormwrite(Device *d, Off b, void *c)
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{
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	Iobuf *p;
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	Device *fdev;
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	Devsize l;
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	if(DEBUG)
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		print("fworm write %lld\n", (Wideoff)b);
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	fdev = FDEV(d);
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	l = devsize(fdev);
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	l -= l/(BUFSIZE*8) + 1;
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	if(b >= l)
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		panic("fworm: wbounds %lld", (Wideoff)b);
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	l += b/(BUFSIZE*8);
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	p = getbuf(fdev, l, Brd|Bmod|Bres);
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	if(!p || checktag(p, Tvirgo, l))
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		panic("fworm: checktag %lld", (Wideoff)l);
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	l = b % (BUFSIZE*8);
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	if((p->iobuf[l/8] & (1<<(l%8)))) {
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		putbuf(p);
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		print("fworm: write %lld\n", (Wideoff)b);
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		return 1;
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	}
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	p->iobuf[l/8] |= 1<<(l%8);
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	putbuf(p);
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	return devwrite(fdev, b, c);
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}