Subversion Repositories planix.SVN

#include <u.h>
#include <libc.h>
#include "iotrack.h"
#include "dat.h"
#include "fns.h"

int readonly;

static int
deverror(char *name, Xfs *xf, long addr, long n, long nret)
{
        errno = Eio;
        if(nret < 0){
                chat("%s errstr=\"%r\"...", name);
                close(xf->dev);
                xf->dev = -1;
                return -1;
        }
        fprint(2, "dev %d sector %ld, %s: %ld, should be %ld\n", xf->dev, addr, name, nret, n);
        return -1;
}

int
devread(Xfs *xf, long addr, void *buf, long n)
{
        long nread;

        if(xf->dev < 0)
                return -1;
        nread = pread(xf->dev, buf, n, xf->offset+(vlong)addr*Sectorsize);
        if (nread == n)
                return 0;
        return deverror("read", xf, addr, n, nread);
}

int
devwrite(Xfs *xf, long addr, void *buf, long n)
{
        long nwrite;

        if(xf->omode==OREAD)
                return -1;

        if(xf->dev < 0)
                return -1;
        nwrite = pwrite(xf->dev, buf, n, xf->offset+(vlong)addr*Sectorsize);
        if (nwrite == n)
                return 0;
        return deverror("write", xf, addr, n, nwrite);
}

int
devcheck(Xfs *xf)
{
        char buf[Sectorsize];

        if(xf->dev < 0)
                return -1;
        if(pread(xf->dev, buf, Sectorsize, 0) != Sectorsize){
                close(xf->dev);
                xf->dev = -1;
                return -1;
        }
        return 0;
}