testsuite/systemtap.examples/io/mbrwatch.stp


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#! /usr/bin/env stap

probe ioblock.request {
    if (bdev==bdev_contains && sector<4) {
	printf("device %s sector %d %s, process %s[%d]\n",
		devname, sector, (rw==BIO_READ ? "read":"write"), execname(), pid())
	print_backtrace()
    }
}