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#include "stdinc.h"
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#include "dat.h"
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#include "fns.h"
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void
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zeropart(Part *part, int blocksize)
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{
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	ZBlock *b;
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	u64int addr;
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	int w;
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	fprint(2, "clearing %s\n", part->name);
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	b = alloczblock(MaxIoSize, 1, blocksize);
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	w = 0;
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	for(addr = PartBlank; addr + MaxIoSize <= part->size; addr += MaxIoSize){
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		if(writepart(part, addr, b->data, MaxIoSize) < 0)
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			sysfatal("can't initialize %s, writing block %d failed: %r", part->name, w);
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		w++;
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	}
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	for(; addr + blocksize <= part->size; addr += blocksize)
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		if(writepart(part, addr, b->data, blocksize) < 0)
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			sysfatal("can't initialize %s: %r", part->name);
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	if(flushpart(part) < 0)
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		sysfatal("can't flush writes to %s: %r", part->name);
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	freezblock(b);
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}