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ssd_page.c
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ssd_page.c
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/* Copyright 2009, 20 Brendan Tauras */
/* ssd_page.cpp is part of FlashSim. */
/* FlashSim is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* any later version. */
/* FlashSim is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details. */
/* You should have received a copy of the GNU General Public License
* along with FlashSim. If not, see <http://www.gnu.org/licenses/>. */
/****************************************************************************/
/* Page class
* Brendan Tauras 2009-04-06
*
* The page is the lowest level data storage unit that is the size unit of
* requests (events). Pages maintain their state as events modify them. */
#include "ssd.h"
static int64 _read_delay;
static int64 _write_delay;
Page *ssd_page_init (Page *p, const Block *parent, int64 read_delay, int64 write_delay)
{
p->state = EMPTY;
p->parent = parent;
_read_delay = read_delay;
_write_delay = write_delay;
if(read_delay < 0){
SSD_ERROR("Page warning: constructor received negative read delay value\n\tsetting read delay to 0\n");
_read_delay = 0;
}
if(write_delay < 0){
SSD_ERROR("Page warning: constructor received negative write delay value\n\tsetting write delay to 0\n");
_write_delay = 0;
}
return p;
}
Page *ssd_page_new (const Block *parent, int64 read_delay, int64 write_delay)
{
SSD_NEW(Page);
return ssd_page_init (obj, parent, read_delay, write_delay);
}
void ssd_page_free (Page *p)
{
ssd_free (p);
}
static int g_cnt = 0;
static int g_cnt2 = 0;
#define NOCHECK_PAGE_STATE 0
enum status ssd_page_read(Page *p, Event *event)
{
assert(_read_delay >= 0);
if(NOCHECK_PAGE_STATE || p->state == VALID || p->state == EMPTY){
ssd_event_incr_time_taken(event, _read_delay);
return SUCCESS;
} else {
SSD_ERROR("#%d page =0x%lx, state=%d, %d, ppn=%lu %u\n", g_cnt2, (long)p, p->state, EMPTY, event->logical_address, event->size);
return FAILURE;
}
}
enum status ssd_page_write(Page *p, Event *event)
{
assert(_write_delay >= 0);
if(NOCHECK_PAGE_STATE || p->state == EMPTY){
ssd_event_incr_time_taken(event, _write_delay);
p->state = VALID;
return SUCCESS;
} else {
SSD_ERROR("#%d page =0x%lx, state=%d, %d, ppn=%lu, %u\n", g_cnt, (long)p, p->state, EMPTY, event->logical_address, event->size);
return FAILURE;
}
}
const Block *ssd_page_get_parent(Page *p)
{
return p->parent;
}
enum page_state ssd_page_get_state(Page *p)
{
return p->state;
}
void ssd_page_set_state(Page *p, enum page_state state)
{
p->state = state;
}