2 * Copyright (C) 1995-1997 Claus-Justus Heine.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2, or (at your option)
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; see the file COPYING. If not, write to
16 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
19 * $Source: /homes/cvs/ftape-stacked/ftape/zftape/zftape-buffers.c,v $
21 * $Date: 1997/10/05 19:18:59 $
23 * This file contains the dynamic buffer allocation routines
27 #include <linux/errno.h>
29 #include <linux/slab.h>
31 #include <linux/zftape.h>
33 #include <linux/vmalloc.h>
35 #include "../zftape/zftape-init.h"
36 #include "../zftape/zftape-eof.h"
37 #include "../zftape/zftape-ctl.h"
38 #include "../zftape/zftape-write.h"
39 #include "../zftape/zftape-read.h"
40 #include "../zftape/zftape-rw.h"
41 #include "../zftape/zftape-vtbl.h"
48 static unsigned int used_memory;
49 static unsigned int peak_memory;
51 void zft_memory_stats(void)
55 TRACE(ft_t_noise, "Memory usage (vmalloc allocations):\n"
56 KERN_INFO "total allocated: %d\n"
57 KERN_INFO "peak allocation: %d",
58 used_memory, peak_memory);
59 peak_memory = used_memory;
63 int zft_vcalloc_once(void *new, size_t size)
66 if (zft_vmalloc_once(new, size) < 0) {
69 memset(*(void **)new, '\0', size);
72 int zft_vmalloc_once(void *new, size_t size)
76 if (*(void **)new != NULL || size == 0) {
79 if ((*(void **)new = vmalloc(size)) == NULL) {
83 if (peak_memory < used_memory) {
84 peak_memory = used_memory;
86 TRACE_ABORT(0, ft_t_noise,
87 "allocated buffer @ %p, %d bytes", *(void **)new, size);
89 int zft_vcalloc_always(void *new, size_t size)
94 TRACE_EXIT zft_vcalloc_once(new, size);
96 int zft_vmalloc_always(void *new, size_t size)
100 zft_vfree(new, size);
101 TRACE_EXIT zft_vmalloc_once(new, size);
103 void zft_vfree(void *old, size_t size)
105 TRACE_FUN(ft_t_flow);
108 vfree(*(void **)old);
110 TRACE(ft_t_noise, "released buffer @ %p, %d bytes",
111 *(void **)old, size);
112 *(void **)old = NULL;
117 void *zft_kmalloc(size_t size)
121 while ((new = kmalloc(size, GFP_KERNEL)) == NULL) {
122 current->state = TASK_INTERRUPTIBLE;
123 schedule_timeout(HZ/10);
125 memset(new, 0, size);
127 if (peak_memory < used_memory) {
128 peak_memory = used_memory;
133 void zft_kfree(void *old, size_t size)
139 /* there are some more buffers that are allocated on demand.
140 * cleanup_module() calles this function to be sure to have released
143 void zft_uninit_mem(void)
145 TRACE_FUN(ft_t_flow);
147 zft_vfree(&zft_hseg_buf, FT_SEGMENT_SIZE);
148 zft_vfree(&zft_deblock_buf, FT_SEGMENT_SIZE); zft_deblock_segment = -1;
150 if (zft_cmpr_lock(0 /* don't load */) == 0) {
151 (*zft_cmpr_ops->cleanup)();
152 (*zft_cmpr_ops->reset)(); /* unlock it again */