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// IO scheduler tapset
// Copyright (C) 2005, 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.
%{
#include <linux/blkdev.h>
#include <linux/elevator.h>
%}
/* when a request is retrieved from request queue */
probe ioscheduler.elv_next_request
= kernel.function("elv_next_request")
{
%( kernel_v >= "2.6.10" %?
elevator_name = kernel_string($q->elevator->elevator_type->elevator_name)
%:
elevator_name = kernel_string($q->elevator->elevator_name)
%)
}
probe ioscheduler.elv_next_request.return
= kernel.function("elv_next_request").return
{
if($return == 0) {
req = 0
req_flags = 0
disk_major = -1
disk_minor = -1
} else {
req = $return
%( kernel_v >= "2.6.19" %?
req_flags = $return->cmd_flags
%:
req_flags = $return->flags
%)
if($return->rq_disk == 0) {
disk_major = -1
disk_minor = -1
} else {
disk_major = $return->rq_disk->major
disk_minor = $return->rq_disk->first_minor
}
}
}
/* when a request is added to the request queue */
probe ioscheduler.elv_add_request
= kernel.function("__elv_add_request")
{
%( kernel_v >= "2.6.10" %?
elevator_name = kernel_string($q->elevator->elevator_type->elevator_name)
%:
elevator_name = kernel_string($q->elevator->elevator_name)
%)
if($rq == 0) {
disk_major = -1
disk_minor = -1
} else {
if($rq->rq_disk == 0) {
disk_major = -1
disk_minor = -1
} else {
disk_major = $rq->rq_disk->major
disk_minor = $rq->rq_disk->first_minor
}
}
req = $rq
%( kernel_v >= "2.6.19" %?
req_flags = $rq==0? 0:$rq->cmd_flags
%:
req_flags = $rq==0? 0:$rq->flags
%)
}
/* when a request is completed */
probe ioscheduler.elv_completed_request
= kernel.function("elv_completed_request")
{
%( kernel_v >= "2.6.10" %?
elevator_name = kernel_string($q->elevator->elevator_type->elevator_name)
%:
elevator_name = kernel_string($q->elevator->elevator_name)
%)
if($rq == 0) {
disk_major = -1
disk_minor = -1
} else {
if($rq->rq_disk == 0) {
disk_major = -1
disk_minor = -1
} else {
disk_major = $rq->rq_disk->major
disk_minor = $rq->rq_disk->first_minor
}
}
req = $rq
%( kernel_v >= "2.6.19" %?
req_flags = $rq==0? 0:$rq->cmd_flags
%:
req_flags = $rq==0? 0:$rq->flags
%)
}
function disk_major_from_request:long(var_q:long)
%{ /* pure */
struct request_queue *q = (struct request_queue *)((long)THIS->var_q);
struct list_head *queue_head = &(q->queue_head);
if (list_empty(&(q->queue_head))) /* FIXME: deref hazard! */
THIS->__retvalue = -1;
else {
struct request *rq = list_entry_rq(q->queue_head.next); /* FIXME: deref hazard! */
struct gendisk *rq_disk = kread(&(rq->rq_disk));
THIS->__retvalue = kread(&(rq_disk->major));
}
CATCH_DEREF_FAULT();
%}
function disk_minor_from_request:long(var_q:long)
%{ /* pure */
struct request_queue *q = (struct request_queue *)((long)THIS->var_q);
struct list_head *queue_head = &(q->queue_head);
if (list_empty(&(q->queue_head))) /* FIXME: deref hazard! */
THIS->__retvalue = -1;
else {
struct request *rq = list_entry_rq(q->queue_head.next); /* FIXME: deref hazard! */
struct gendisk *rq_disk = kread(&(rq->rq_disk));
THIS->__retvalue = kread(&(rq_disk->first_minor));
}
CATCH_DEREF_FAULT();
%}
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