1 /*
2 * Copyright (C) 1995-1997 Claus-Justus Heine.
3
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)
7 any later version.
8
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.
13
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.
17
18 *
19 * $Source: /homes/cvs/ftape-stacked/ftape/zftape/zftape-buffers.c,v $
20 * $Revision: 1.2 $
21 * $Date: 1997/10/05 19:18:59 $
22 *
23 * This file contains the dynamic buffer allocation routines
24 * of zftape
25 */
26
27 #include <linux/errno.h>
28 #include <linux/mm.h>
29 #include <linux/slab.h>
30 #include <linux/delay.h>
31
32 #include <linux/zftape.h>
33
34 #include <linux/vmalloc.h>
35
36 #include "../zftape/zftape-init.h"
37 #include "../zftape/zftape-eof.h"
38 #include "../zftape/zftape-ctl.h"
39 #include "../zftape/zftape-write.h"
40 #include "../zftape/zftape-read.h"
41 #include "../zftape/zftape-rw.h"
42 #include "../zftape/zftape-vtbl.h"
43
44 /* global variables
45 */
46
47 /* local varibales
48 */
49 static unsigned int used_memory;
50 static unsigned int peak_memory;
51
52 void zft_memory_stats(void)
53 {
54 TRACE_FUN(ft_t_flow);
55
56 TRACE(ft_t_noise, "Memory usage (vmalloc allocations):\n"
57 KERN_INFO "total allocated: %d\n"
58 KERN_INFO "peak allocation: %d",
59 used_memory, peak_memory);
60 peak_memory = used_memory;
61 TRACE_EXIT;
62 }
63
64 int zft_vcalloc_once(void *new, size_t size)
65 {
66 TRACE_FUN(ft_t_flow);
67 if (zft_vmalloc_once(new, size) < 0) {
68 TRACE_EXIT -ENOMEM;
69 }
70 memset(*(void **)new, '\0', size);
71 TRACE_EXIT 0;
72 }
73 int zft_vmalloc_once(void *new, size_t size)
74 {
75 TRACE_FUN(ft_t_flow);
76
77 if (*(void **)new != NULL || size == 0) {
78 TRACE_EXIT 0;
79 }
80 if ((*(void **)new = vmalloc(size)) == NULL) {
81 TRACE_EXIT -ENOMEM;
82 }
83 used_memory += size;
84 if (peak_memory < used_memory) {
85 peak_memory = used_memory;
86 }
87 TRACE_ABORT(0, ft_t_noise,
88 "allocated buffer @ %p, %d bytes", *(void **)new, size);
89 }
90 int zft_vmalloc_always(void *new, size_t size)
91 {
92 TRACE_FUN(ft_t_flow);
93
94 zft_vfree(new, size);
95 TRACE_EXIT zft_vmalloc_once(new, size);
96 }
97 void zft_vfree(void *old, size_t size)
98 {
99 TRACE_FUN(ft_t_flow);
100
101 if (*(void **)old) {
102 vfree(*(void **)old);
103 used_memory -= size;
104 TRACE(ft_t_noise, "released buffer @ %p, %d bytes",
105 *(void **)old, size);
106 *(void **)old = NULL;
107 }
108 TRACE_EXIT;
109 }
110
111 void *zft_kmalloc(size_t size)
112 {
113 void *new;
114
115 while ((new = kmalloc(size, GFP_KERNEL)) == NULL) {
116 msleep_interruptible(100);
117 }
118 memset(new, 0, size);
119 used_memory += size;
120 if (peak_memory < used_memory) {
121 peak_memory = used_memory;
122 }
123 return new;
124 }
125
126 void zft_kfree(void *old, size_t size)
127 {
128 kfree(old);
129 used_memory -= size;
130 }
131
132 /* there are some more buffers that are allocated on demand.
133 * cleanup_module() calles this function to be sure to have released
134 * them
135 */
136 void zft_uninit_mem(void)
137 {
138 TRACE_FUN(ft_t_flow);
139
140 zft_vfree(&zft_hseg_buf, FT_SEGMENT_SIZE);
141 zft_vfree(&zft_deblock_buf, FT_SEGMENT_SIZE); zft_deblock_segment = -1;
142 zft_free_vtbl();
143 if (zft_cmpr_lock(0 /* don't load */) == 0) {
144 (*zft_cmpr_ops->cleanup)();
145 (*zft_cmpr_ops->reset)(); /* unlock it again */
146 }
147 zft_memory_stats();
148 TRACE_EXIT;
149 }
150
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