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/*
* Copyright (C) 1995-1997 Claus-Justus Heine.
This program 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 2, or (at your option)
any later version.
This program 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 this program; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Source: /homes/cvs/ftape-stacked/ftape/zftape/zftape-buffers.c,v $
* $Revision: 1.2 $
* $Date: 1997/10/05 19:18:59 $
*
* This file contains the dynamic buffer allocation routines
* of zftape
*/
#include <linux/errno.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/zftape.h>
#include <linux/vmalloc.h>
#include "../zftape/zftape-init.h"
#include "../zftape/zftape-eof.h"
#include "../zftape/zftape-ctl.h"
#include "../zftape/zftape-write.h"
#include "../zftape/zftape-read.h"
#include "../zftape/zftape-rw.h"
#include "../zftape/zftape-vtbl.h"
/* global variables
*/
/* local varibales
*/
static unsigned int used_memory;
static unsigned int peak_memory;
void zft_memory_stats(void)
{
TRACE_FUN(ft_t_flow);
TRACE(ft_t_noise, "Memory usage (vmalloc allocations):\n"
KERN_INFO "total allocated: %d\n"
KERN_INFO "peak allocation: %d",
used_memory, peak_memory);
peak_memory = used_memory;
TRACE_EXIT;
}
int zft_vcalloc_once(void *new, size_t size)
{
TRACE_FUN(ft_t_flow);
if (zft_vmalloc_once(new, size) < 0) {
TRACE_EXIT -ENOMEM;
}
memset(*(void **)new, '\0', size);
TRACE_EXIT 0;
}
int zft_vmalloc_once(void *new, size_t size)
{
TRACE_FUN(ft_t_flow);
if (*(void **)new != NULL || size == 0) {
TRACE_EXIT 0;
}
if ((*(void **)new = vmalloc(size)) == NULL) {
TRACE_EXIT -ENOMEM;
}
used_memory += size;
if (peak_memory < used_memory) {
peak_memory = used_memory;
}
TRACE_ABORT(0, ft_t_noise,
"allocated buffer @ %p, %zd bytes", *(void **)new, size);
}
int zft_vmalloc_always(void *new, size_t size)
{
TRACE_FUN(ft_t_flow);
zft_vfree(new, size);
TRACE_EXIT zft_vmalloc_once(new, size);
}
void zft_vfree(void *old, size_t size)
{
TRACE_FUN(ft_t_flow);
if (*(void **)old) {
vfree(*(void **)old);
used_memory -= size;
TRACE(ft_t_noise, "released buffer @ %p, %zd bytes",
*(void **)old, size);
*(void **)old = NULL;
}
TRACE_EXIT;
}
void *zft_kmalloc(size_t size)
{
void *new;
while ((new = kmalloc(size, GFP_KERNEL)) == NULL) {
msleep_interruptible(100);
}
memset(new, 0, size);
used_memory += size;
if (peak_memory < used_memory) {
peak_memory = used_memory;
}
return new;
}
void zft_kfree(void *old, size_t size)
{
kfree(old);
used_memory -= size;
}
/* there are some more buffers that are allocated on demand.
* cleanup_module() calles this function to be sure to have released
* them
*/
void zft_uninit_mem(void)
{
TRACE_FUN(ft_t_flow);
zft_vfree(&zft_hseg_buf, FT_SEGMENT_SIZE);
zft_vfree(&zft_deblock_buf, FT_SEGMENT_SIZE); zft_deblock_segment = -1;
zft_free_vtbl();
if (zft_cmpr_lock(0 /* don't load */) == 0) {
(*zft_cmpr_ops->cleanup)();
(*zft_cmpr_ops->reset)(); /* unlock it again */
}
zft_memory_stats();
TRACE_EXIT;
}
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