1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
149 lines
3.5 KiB
C
149 lines
3.5 KiB
C
/*
|
|
* 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, %d 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, %d 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;
|
|
}
|