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#include <u.h>
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#include <libc.h>
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#include "iotrack.h"
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#include "dat.h"
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#include "fns.h"
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int readonly;
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static int
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deverror(char *name, Xfs *xf, long addr, long n, long nret)
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{
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	errno = Eio;
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	if(nret < 0){
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		chat("%s errstr=\"%r\"...", name);
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		close(xf->dev);
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		xf->dev = -1;
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		return -1;
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	}
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	fprint(2, "dev %d sector %ld, %s: %ld, should be %ld\n", xf->dev, addr, name, nret, n);
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	return -1;
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}
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int
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devread(Xfs *xf, long addr, void *buf, long n)
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{
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	long nread;
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	if(xf->dev < 0)
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		return -1;
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	nread = pread(xf->dev, buf, n, xf->offset+(vlong)addr*Sectorsize);
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	if (nread == n)
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		return 0;
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	return deverror("read", xf, addr, n, nread);
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}
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int
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devwrite(Xfs *xf, long addr, void *buf, long n)
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{
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	long nwrite;
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	if(xf->omode==OREAD)
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		return -1;
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	if(xf->dev < 0)
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		return -1;
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	nwrite = pwrite(xf->dev, buf, n, xf->offset+(vlong)addr*Sectorsize);
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	if (nwrite == n)
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		return 0;
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	return deverror("write", xf, addr, n, nwrite);
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}
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int
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devcheck(Xfs *xf)
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{
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	char buf[Sectorsize];
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	if(xf->dev < 0)
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		return -1;
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	if(pread(xf->dev, buf, Sectorsize, 0) != Sectorsize){
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		close(xf->dev);
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		xf->dev = -1;
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		return -1;
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	}
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	return 0;
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}