aboutsummaryrefslogtreecommitdiff
path: root/fs/jffs2/malloc.c
blob: b8fd651307a42e2fce3d15dfcc1976e2526932ab (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
/*
 * JFFS2 -- Journalling Flash File System, Version 2.
 *
 * Copyright © 2001-2007 Red Hat, Inc.
 *
 * Created by David Woodhouse <dwmw2@infradead.org>
 *
 * For licensing information, see the file 'LICENCE' in this directory.
 *
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/jffs2.h>
#include "nodelist.h"

/* These are initialised to NULL in the kernel startup code.
   If you're porting to other operating systems, beware */
static struct kmem_cache *full_dnode_slab;
static struct kmem_cache *raw_dirent_slab;
static struct kmem_cache *raw_inode_slab;
static struct kmem_cache *tmp_dnode_info_slab;
static struct kmem_cache *raw_node_ref_slab;
static struct kmem_cache *node_frag_slab;
static struct kmem_cache *inode_cache_slab;
#ifdef CONFIG_JFFS2_FS_XATTR
static struct kmem_cache *xattr_datum_cache;
static struct kmem_cache *xattr_ref_cache;
#endif

int __init jffs2_create_slab_caches(void)
{
	full_dnode_slab = kmem_cache_create("jffs2_full_dnode",
					    sizeof(struct jffs2_full_dnode),
					    0, 0, NULL);
	if (!full_dnode_slab)
		goto err;

	raw_dirent_slab = kmem_cache_create("jffs2_raw_dirent",
					    sizeof(struct jffs2_raw_dirent),
					    0, SLAB_HWCACHE_ALIGN, NULL);
	if (!raw_dirent_slab)
		goto err;

	raw_inode_slab = kmem_cache_create("jffs2_raw_inode",
					   sizeof(struct jffs2_raw_inode),
					   0, SLAB_HWCACHE_ALIGN, NULL);
	if (!raw_inode_slab)
		goto err;

	tmp_dnode_info_slab = kmem_cache_create("jffs2_tmp_dnode",
						sizeof(struct jffs2_tmp_dnode_info),
						0, 0, NULL);
	if (!tmp_dnode_info_slab)
		goto err;

	raw_node_ref_slab = kmem_cache_create("jffs2_refblock",
					      sizeof(struct jffs2_raw_node_ref) * (REFS_PER_BLOCK + 1),
					      0, 0, NULL);
	if (!raw_node_ref_slab)
		goto err;

	node_frag_slab = kmem_cache_create("jffs2_node_frag",
					   sizeof(struct jffs2_node_frag),
					   0, 0, NULL);
	if (!node_frag_slab)
		goto err;

	inode_cache_slab = kmem_cache_create("jffs2_inode_cache",
					     sizeof(struct jffs2_inode_cache),
					     0, 0, NULL);
	if (!inode_cache_slab)
		goto err;

#ifdef CONFIG_JFFS2_FS_XATTR
	xattr_datum_cache = kmem_cache_create("jffs2_xattr_datum",
					     sizeof(struct jffs2_xattr_datum),
					     0, 0, NULL);
	if (!xattr_datum_cache)
		goto err;

	xattr_ref_cache = kmem_cache_create("jffs2_xattr_ref",
					   sizeof(struct jffs2_xattr_ref),
					   0, 0, NULL);
	if (!xattr_ref_cache)
		goto err;
#endif

	return 0;
 err:
	jffs2_destroy_slab_caches();
	return -ENOMEM;
}

void jffs2_destroy_slab_caches(void)
{
	if(full_dnode_slab)
		kmem_cache_destroy(full_dnode_slab);
	if(raw_dirent_slab)
		kmem_cache_destroy(raw_dirent_slab);
	if(raw_inode_slab)
		kmem_cache_destroy(raw_inode_slab);
	if(tmp_dnode_info_slab)
		kmem_cache_destroy(tmp_dnode_info_slab);
	if(raw_node_ref_slab)
		kmem_cache_destroy(raw_node_ref_slab);
	if(node_frag_slab)
		kmem_cache_destroy(node_frag_slab);
	if(inode_cache_slab)
		kmem_cache_destroy(inode_cache_slab);
#ifdef CONFIG_JFFS2_FS_XATTR
	if (xattr_datum_cache)
		kmem_cache_destroy(xattr_datum_cache);
	if (xattr_ref_cache)
		kmem_cache_destroy(xattr_ref_cache);
#endif
}

struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize)
{
	struct jffs2_full_dirent *ret;
	ret = kmalloc(sizeof(struct jffs2_full_dirent) + namesize, GFP_KERNEL);
	dbg_memalloc("%p\n", ret);
	return ret;
}

void jffs2_free_full_dirent(struct jffs2_full_dirent *x)
{
	dbg_memalloc("%p\n", x);
	kfree(x);
}

struct jffs2_full_dnode *jffs2_alloc_full_dnode(void)
{
	struct jffs2_full_dnode *ret;
	ret = kmem_cache_alloc(full_dnode_slab, GFP_KERNEL);
	dbg_memalloc("%p\n", ret);
	return ret;
}

void jffs2_free_full_dnode(struct jffs2_full_dnode *x)
{
	dbg_memalloc("%p\n", x);
	kmem_cache_free(full_dnode_slab, x);
}

struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void)
{
	struct jffs2_raw_dirent *ret;
	ret = kmem_cache_alloc(raw_dirent_slab, GFP_KERNEL);
	dbg_memalloc("%p\n", ret);
	return ret;
}

void jffs2_free_raw_dirent(struct jffs2_raw_dirent *x)
{
	dbg_memalloc("%p\n", x);
	kmem_cache_free(raw_dirent_slab, x);
}

struct jffs2_raw_inode *jffs2_alloc_raw_inode(void)
{
	struct jffs2_raw_inode *ret;
	ret = kmem_cache_alloc(raw_inode_slab, GFP_KERNEL);
	dbg_memalloc("%p\n", ret);
	return ret;
}

void jffs2_free_raw_inode(struct jffs2_raw_inode *x)
{
	dbg_memalloc("%p\n", x);
	kmem_cache_free(raw_inode_slab, x);
}

struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void)
{
	struct jffs2_tmp_dnode_info *ret;
	ret = kmem_cache_alloc(tmp_dnode_info_slab, GFP_KERNEL);
	dbg_memalloc("%p\n",
		ret);
	return ret;
}

void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *x)
{
	dbg_memalloc("%p\n", x);
	kmem_cache_free(tmp_dnode_info_slab, x);
}

static struct jffs2_raw_node_ref *jffs2_alloc_refblock(void)
{
	struct jffs2_raw_node_ref *ret;

	ret = kmem_cache_alloc(raw_node_ref_slab, GFP_KERNEL);
	if (ret) {
		int i = 0;
		for (i=0; i < REFS_PER_BLOCK; i++) {
			ret[i].flash_offset = REF_EMPTY_NODE;
			ret[i].next_in_ino = NULL;
		}
		ret[i].flash_offset = REF_LINK_NODE;
		ret[i].next_in_ino = NULL;
	}
	return ret;
}

int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c,
				 struct jffs2_eraseblock *jeb, int nr)
{
	struct jffs2_raw_node_ref **p, *ref;
	int i = nr;

	dbg_memalloc("%d\n", nr);

	p = &jeb->last_node;
	ref = *p;

	dbg_memalloc("Reserving %d refs for block @0x%08x\n", nr, jeb->offset);

	/* If jeb->last_node is really a valid node then skip over it */
	if (ref && ref->flash_offset != REF_EMPTY_NODE)
		ref++;

	while (i) {
		if (!ref) {
			dbg_memalloc("Allocating new refblock linked from %p\n", p);
			ref = *p = jffs2_alloc_refblock();
			if (!ref)
				return -ENOMEM;
		}
		if (ref->flash_offset == REF_LINK_NODE) {
			p = &ref->next_in_ino;
			ref = *p;
			continue;
		}
		i--;
		ref++;
	}
	jeb->allocated_refs = nr;

	dbg_memalloc("Reserved %d refs for block @0x%08x, last_node is %p (%08x,%p)\n",
		  nr, jeb->offset, jeb->last_node, jeb->last_node->flash_offset,
		  jeb->last_node->next_in_ino);

	return 0;
}

void jffs2_free_refblock(struct jffs2_raw_node_ref *x)
{
	dbg_memalloc("%p\n", x);
	kmem_cache_free(raw_node_ref_slab, x);
}

struct jffs2_node_frag *jffs2_alloc_node_frag(void)
{
	struct jffs2_node_frag *ret;
	ret = kmem_cache_alloc(node_frag_slab, GFP_KERNEL);
	dbg_memalloc("%p\n", ret);
	return ret;
}

void jffs2_free_node_frag(struct jffs2_node_frag *x)
{
	dbg_memalloc("%p\n", x);
	kmem_cache_free(node_frag_slab, x);
}

struct jffs2_inode_cache *jffs2_alloc_inode_cache(void)
{
	struct jffs2_inode_cache *ret;
	ret = kmem_cache_alloc(inode_cache_slab, GFP_KERNEL);
	dbg_memalloc("%p\n", ret);
	return ret;
}

void jffs2_free_inode_cache(struct jffs2_inode_cache *x)
{
	dbg_memalloc("%p\n", x);
	kmem_cache_free(inode_cache_slab, x);
}

#ifdef CONFIG_JFFS2_FS_XATTR
struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void)
{
	struct jffs2_xattr_datum *xd;
	xd = kmem_cache_zalloc(xattr_datum_cache, GFP_KERNEL);
	dbg_memalloc("%p\n", xd);
	if (!xd)
		return NULL;

	xd->class = RAWNODE_CLASS_XATTR_DATUM;
	xd->node = (void *)xd;
	INIT_LIST_HEAD(&xd->xindex);
	return xd;
}

void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd)
{
	dbg_memalloc("%p\n", xd);
	kmem_cache_free(xattr_datum_cache, xd);
}

struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void)
{
	struct jffs2_xattr_ref *ref;
	ref = kmem_cache_zalloc(xattr_ref_cache, GFP_KERNEL);
	dbg_memalloc("%p\n", ref);
	if (!ref)
		return NULL;

	ref->class = RAWNODE_CLASS_XATTR_REF;
	ref->node = (void *)ref;
	return ref;
}

void jffs2_free_xattr_ref(struct jffs2_xattr_ref *ref)
{
	dbg_memalloc("%p\n", ref);
	kmem_cache_free(xattr_ref_cache, ref);
}
#endif