75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
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/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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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, int32_t addr, int32_t n, int32_t 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, int32_t addr, void *buf, int32_t n)
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{
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int32_t 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+(int64_t)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, int32_t addr, void *buf, int32_t n)
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{
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int32_t 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+(int64_t)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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}
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