testsuite/systemtap.examples/io/traceio2.stp


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global device_of_interest

probe begin {
  /* The following is not the most efficient way to do this.
      One could directly put the result of usrdev2kerndev()
      into device_of_interest.  However, want to test out
      the other device functions */
  dev = usrdev2kerndev($1)
  device_of_interest = MKDEV(MAJOR(dev), MINOR(dev))
}

probe vfs.write,
      vfs.read
{
        dev_nr = $file->
             	%( kernel_v < "2.6.19" %? f_dentry %: f_path->dentry %)
		->d_inode->i_sb->s_dev

        if (dev_nr == device_of_interest)
                printf ("%s(%d) %s 0x%x\n",
		        execname(), pid(), probefunc(), dev_nr)
}