MINI SHELL

// AIO tapset
// Copyright (C) 2006 IBM Corp.
//
// This file is part of systemtap, and is free software.  You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.

/*
 * the following aio related probes are used to probe those aio related
 * calls inside the kernel. They are: sys_io_setup, sys_io_submit, 
 * sys_io_getevents, sys_io_destroy, sys_io_cancel, io_submit_one
 */

probe addevent.aio
	= addevent.aio.entry, addevent.aio.return
{}

probe addevent.aio.entry
	=
	addevent.aio.io_setup.entry,
	addevent.aio.io_submit.entry,
	addevent.aio.io_submit_one.entry,
	addevent.aio.io_destroy.entry,
	addevent.aio.io_getevents.entry,
	addevent.aio.io_cancel.entry
{}

probe addevent.aio.return
	=
	addevent.aio.io_setup.return,
	addevent.aio.io_submit.return,
	addevent.aio.io_submit_one.return,
	addevent.aio.io_destroy.return,
	addevent.aio.io_getevents.return,
	addevent.aio.io_cancel.return
{}

/* 
 *  Fires by calling io_setup from user space. The corresponding
 *  system call is sys_io_setup, which will create an aio_context 
 *  capable of receiving at least maxevents.
 */
probe addevent.aio.io_setup.entry
	+= _addevent.aio.io_setup.entry
{
	update_record()
}

probe _addevent.aio.io_setup.entry
	= syscall.io_setup
{
	log_aio_setup(HOOKID_AIO_IO_SETUP_ENTRY, maxevents, ctxp_uaddr)
}

function log_aio_setup(hookid:long, nr_events:long, ctxp_uaddr:long)
%{
	/* nr_events|ctxp_uaddr */
	_lket_trace(_GROUP_AIO, THIS->hookid, "%4b%8b", 
		THIS->nr_events, THIS->ctxp_uaddr);
%}

probe addevent.aio.io_setup.return
        += _addevent.aio.io_setup.return
{
        update_record()
}

probe _addevent.aio.io_setup.return
        = kernel.function("sys_io_setup").return
{
        log_aio_return(HOOKID_AIO_IO_SETUP_RETURN, $return)
}

function log_aio_return(hookid:long, retval:long)
%{
	_lket_trace(_GROUP_AIO, THIS->hookid, "%8b", THIS->retval);
%}

/*
 * Fired by calling io_submit from user space. The corresponding  
 * system call is sys_io_submit which will queue the nr iocbs 
 * pointed to by iocbpp_uaddr for processing.
 */
probe addevent.aio.io_submit.entry
	+= _addevent.aio.io_submit.entry
{
	update_record()
}

probe _addevent.aio.io_submit.entry
	= syscall.io_submit
{
	log_aio_submit(HOOKID_AIO_IO_SUBMIT_ENTRY, ctx_id, nr, iocbpp_uaddr)
}

function log_aio_submit(hookid:long, ctx_id:long, nr:long, iocbpp_uaddr:long)
%{
	/* ctx_id | no_iocbs | iocbpp */
	_lket_trace(_GROUP_AIO, THIS->hookid, "%8b%4b%8b", 
		THIS->ctx_id, THIS->nr, THIS->iocbpp_uaddr);
%}

probe addevent.aio.io_submit.return
	+= _addevent.aio.io_submit.return
{
	update_record()
}

probe _addevent.aio.io_submit.return
	= syscall.io_submit.return
{
	log_aio_return(HOOKID_AIO_IO_SUBMIT_RETURN, $return)	
}

/* Called by sys_io_submit, will iterate iocbpp and process them
 * one by one
 */
probe addevent.aio.io_submit_one.entry
	+= _addevent.aio.io_submit_one.entry
{
	update_record()
}


probe _addevent.aio.io_submit_one.entry
	= kernel.function("io_submit_one")
{
	log_io_submit_one(HOOKID_AIO_IO_SUBMIT_ONE_ENTRY, $ctx, $user_iocb)	
}

function log_io_submit_one(hookid:long, ctx:long, user_iocb_uaddr:long)
%{
	struct iocb *user_iocb = (struct iocb *)((long)THIS->user_iocb_uaddr);

	/* ctx | user_iocb_addr | aio_lio_opcode | >aio_reqprio |
		aio_fildes | aio_buf | aio_nbytes | >aio_offset */
	_lket_trace(_GROUP_AIO, THIS->hookid, 
		"%8b%8b%2b%2b%4b%8b%8b%8b", 
		THIS->ctx, THIS->user_iocb_uaddr, (_FMT_)user_iocb->aio_lio_opcode, 
		(_FMT_)user_iocb->aio_reqprio, (_FMT_)user_iocb->aio_fildes, 
		(_FMT_)user_iocb->aio_buf, (_FMT_)user_iocb->aio_nbytes, 
		(_FMT_)user_iocb->aio_offset);
%}

probe addevent.aio.io_submit_one.return
	+= _addevent.aio.io_submit_one.return
{
	update_record()
}

probe _addevent.aio.io_submit_one.return
	= kernel.function("io_submit_one").return
{
	log_aio_return(HOOKID_AIO_IO_SUBMIT_ONE_RETURN, $return)
}

/*
 * Fired by calling io_destroy from user space. The corresponding 
 * system call is sys_io_destroy, which will destroy the aio_context 
 * specified.
 */
probe addevent.aio.io_destroy.entry
	+= _addevent.aio.io_destroy.entry
{
	update_record()
}

probe _addevent.aio.io_destroy.entry
	= syscall.io_destroy
{
	log_io_destroy(HOOKID_AIO_IO_DESTROY_ENTRY, ctx)
}

function log_io_destroy(hookid:long, ctx:long)
%{
	_lket_trace(_GROUP_AIO, THIS->hookid, "%8b", THIS->ctx);
%}


probe addevent.aio.io_destroy.return
        += _addevent.aio.io_destroy.return
{
        update_record()
}

probe _addevent.aio.io_destroy.return
        = syscall.io_destroy.return
{
        log_aio_return(HOOKID_AIO_IO_DESTROY_RETURN, $return)
}

/*
 * Fired by calling io_getevents from user space. The corresponding 
 * system call is sys_io_getevents, which will attempt to read at 
 * least min_nr events and up to nr events from the completion queue 
 * for the aio_context specified by ctx_id.
 */
probe addevent.aio.io_getevents.entry
        += _addevent.aio.io_getevents.entry
{
        update_record()
}

probe _addevent.aio.io_getevents.entry
        = syscall.io_getevents
{
	log_io_getevents(HOOKID_AIO_IO_GETEVENTS_ENTRY, ctx_id, 
		min_nr, nr, events_uaddr, timeout_uaddr)
}

function log_io_getevents(hookid:long, ctx_id:long, min_nr:long, nr:long, 
		events_uaddr:long, timeout:long)
%{
	struct timespec __user *timeout = (struct timespec *)((long)THIS->timeout);
	struct timespec ts;

	if (unlikely(copy_from_user(&ts, timeout, sizeof(ts))))
		return;

	_lket_trace(_GROUP_AIO, THIS->hookid,
		"%8b%4b%4b%8b%4b%4b", THIS->ctx_id, THIS->min_nr,
		THIS->nr, THIS->events_uaddr, (_FMT_)ts.tv_sec, 
		(_FMT_)ts.tv_nsec);
%}

probe addevent.aio.io_getevents.return
        += _addevent.aio.io_getevents.return
{
        update_record()
}

probe _addevent.aio.io_getevents.return
        = syscall.io_getevents.return
{
        log_aio_return(HOOKID_AIO_IO_GETEVENTS_RETURN, $return)
}

/* 
 * Fired by calling io_cancel from user space. The corresponding
 * system call is sys_io_cancel, which will attempt to cancel 
 * an iocb previously passed to io_submit.
 */
probe addevent.aio.io_cancel.entry
	+= _addevent.aio.io_cancel.entry
{
	update_record()
}

probe _addevent.aio.io_cancel.entry
	= syscall.io_cancel
{
	log_aio_cancel(HOOKID_AIO_IO_CANCEL_ENTRY, ctx_id, 
		iocb_uaddr, result_uaddr)
}

function log_aio_cancel(hookid:long, ctx_id:long, iocb_uaddr:long, result_uaddr:long)
%{
	_lket_trace(_GROUP_AIO, THIS->hookid, "%8b%8b%8b",
		THIS->ctx_id, THIS->iocb_uaddr, THIS->result_uaddr);
%}

probe addevent.aio.io_cancel.return
	+= _addevent.aio.io_cancel.return
{
	update_record()
}

probe _addevent.aio.io_cancel.return
	= syscall.io_cancel.return
{
	log_aio_return(HOOKID_AIO_IO_CANCEL_RETURN, $return)
}