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#! /usr/bin/env stap
#
# Copyright (C) 2021 Red Hat, Inc.
# Written by Nir Soffer <nsoffer@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
@define IOCB_CMD_PREADV %( 7 %)
@define IOCB_CMD_PWRITEV %( 8 %)
probe begin {
println("Tracing started");
}
probe syscall.io_submit
{
if (pid() == target()) {
printf("[%s] io_submit(%s)\n", thread_indent(0), argstr);
for (i = 0; i < nr; i++) {
iocbp = user_uint64(iocbpp_uaddr + i * 8)
fd = user_uint32(&@cast(iocbp, "iocb", "kernel<linux/aio.h>")->aio_fildes)
opcode = user_uint16(&@cast(iocbp, "iocb", "kernel<linux/aio.h>")->aio_lio_opcode)
offset = user_int64(&@cast(iocbp, "iocb", "kernel<linux/aio.h>")->aio_offset)
nbytes = user_uint64(&@cast(iocbp, "iocb", "kernel<linux/aio.h>")->aio_nbytes)
buf = user_uint64(&@cast(iocbp, "iocb", "kernel<linux/aio.h>")->aio_buf)
printf(" iocb[%4d]=%p, fd=%d, opcode=%d, offset=%d, nbytes=%d, buf=%p\n",
i, iocbp, fd, opcode, offset, nbytes, buf)
if (opcode == @IOCB_CMD_PREADV || opcode == @IOCB_CMD_PWRITEV) {
for (j = 0; j < nbytes; j++) {
iovecp = &@cast(buf, "iovec", "kernel<linux/uio.h>")[j]
base = user_uint64(&@cast(iovecp, "iovec", "kernel<linux/uio.h>")->iov_base)
len = user_uint32(&@cast(iovecp, "iovec", "kernel<linux/uio.h>")->iov_len)
printf(" iovec[%4d]=%p, base=%p, len=%d\n",
j, iovecp, base, len)
}
}
}
}
}
probe end {
println("Tracing stopped");
}
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