1/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
4 * Copyright �� 2001-2007 Red Hat, Inc.
5 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/slab.h>
14#include <linux/init.h>
15#include <linux/jffs2.h>
16#include "nodelist.h"
17
18/* These are initialised to NULL in the kernel startup code.
19   If you're porting to other operating systems, beware */
20static struct kmem_cache *full_dnode_slab;
21static struct kmem_cache *raw_dirent_slab;
22static struct kmem_cache *raw_inode_slab;
23static struct kmem_cache *tmp_dnode_info_slab;
24static struct kmem_cache *raw_node_ref_slab;
25static struct kmem_cache *node_frag_slab;
26static struct kmem_cache *inode_cache_slab;
27#ifdef CONFIG_JFFS2_FS_XATTR
28static struct kmem_cache *xattr_datum_cache;
29static struct kmem_cache *xattr_ref_cache;
30#endif
31
32int __init jffs2_create_slab_caches(void)
33{
34	full_dnode_slab = kmem_cache_create("jffs2_full_dnode",
35					    sizeof(struct jffs2_full_dnode),
36					    0, 0, NULL, NULL);
37	if (!full_dnode_slab)
38		goto err;
39
40	raw_dirent_slab = kmem_cache_create("jffs2_raw_dirent",
41					    sizeof(struct jffs2_raw_dirent),
42					    0, 0, NULL, NULL);
43	if (!raw_dirent_slab)
44		goto err;
45
46	raw_inode_slab = kmem_cache_create("jffs2_raw_inode",
47					   sizeof(struct jffs2_raw_inode),
48					   0, 0, NULL, NULL);
49	if (!raw_inode_slab)
50		goto err;
51
52	tmp_dnode_info_slab = kmem_cache_create("jffs2_tmp_dnode",
53						sizeof(struct jffs2_tmp_dnode_info),
54						0, 0, NULL, NULL);
55	if (!tmp_dnode_info_slab)
56		goto err;
57
58	raw_node_ref_slab = kmem_cache_create("jffs2_refblock",
59					      sizeof(struct jffs2_raw_node_ref) * (REFS_PER_BLOCK + 1),
60					      0, 0, NULL, NULL);
61	if (!raw_node_ref_slab)
62		goto err;
63
64	node_frag_slab = kmem_cache_create("jffs2_node_frag",
65					   sizeof(struct jffs2_node_frag),
66					   0, 0, NULL, NULL);
67	if (!node_frag_slab)
68		goto err;
69
70	inode_cache_slab = kmem_cache_create("jffs2_inode_cache",
71					     sizeof(struct jffs2_inode_cache),
72					     0, 0, NULL, NULL);
73	if (!inode_cache_slab)
74		goto err;
75
76#ifdef CONFIG_JFFS2_FS_XATTR
77	xattr_datum_cache = kmem_cache_create("jffs2_xattr_datum",
78					     sizeof(struct jffs2_xattr_datum),
79					     0, 0, NULL, NULL);
80	if (!xattr_datum_cache)
81		goto err;
82
83	xattr_ref_cache = kmem_cache_create("jffs2_xattr_ref",
84					   sizeof(struct jffs2_xattr_ref),
85					   0, 0, NULL, NULL);
86	if (!xattr_ref_cache)
87		goto err;
88#endif
89
90	return 0;
91 err:
92	jffs2_destroy_slab_caches();
93	return -ENOMEM;
94}
95
96void jffs2_destroy_slab_caches(void)
97{
98	if(full_dnode_slab)
99		kmem_cache_destroy(full_dnode_slab);
100	if(raw_dirent_slab)
101		kmem_cache_destroy(raw_dirent_slab);
102	if(raw_inode_slab)
103		kmem_cache_destroy(raw_inode_slab);
104	if(tmp_dnode_info_slab)
105		kmem_cache_destroy(tmp_dnode_info_slab);
106	if(raw_node_ref_slab)
107		kmem_cache_destroy(raw_node_ref_slab);
108	if(node_frag_slab)
109		kmem_cache_destroy(node_frag_slab);
110	if(inode_cache_slab)
111		kmem_cache_destroy(inode_cache_slab);
112#ifdef CONFIG_JFFS2_FS_XATTR
113	if (xattr_datum_cache)
114		kmem_cache_destroy(xattr_datum_cache);
115	if (xattr_ref_cache)
116		kmem_cache_destroy(xattr_ref_cache);
117#endif
118}
119
120struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize)
121{
122	struct jffs2_full_dirent *ret;
123	ret = kmalloc(sizeof(struct jffs2_full_dirent) + namesize, GFP_KERNEL);
124	dbg_memalloc("%p\n", ret);
125	return ret;
126}
127
128void jffs2_free_full_dirent(struct jffs2_full_dirent *x)
129{
130	dbg_memalloc("%p\n", x);
131	kfree(x);
132}
133
134struct jffs2_full_dnode *jffs2_alloc_full_dnode(void)
135{
136	struct jffs2_full_dnode *ret;
137	ret = kmem_cache_alloc(full_dnode_slab, GFP_KERNEL);
138	dbg_memalloc("%p\n", ret);
139	return ret;
140}
141
142void jffs2_free_full_dnode(struct jffs2_full_dnode *x)
143{
144	dbg_memalloc("%p\n", x);
145	kmem_cache_free(full_dnode_slab, x);
146}
147
148struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void)
149{
150	struct jffs2_raw_dirent *ret;
151	ret = kmem_cache_alloc(raw_dirent_slab, GFP_KERNEL);
152	dbg_memalloc("%p\n", ret);
153	return ret;
154}
155
156void jffs2_free_raw_dirent(struct jffs2_raw_dirent *x)
157{
158	dbg_memalloc("%p\n", x);
159	kmem_cache_free(raw_dirent_slab, x);
160}
161
162struct jffs2_raw_inode *jffs2_alloc_raw_inode(void)
163{
164	struct jffs2_raw_inode *ret;
165	ret = kmem_cache_alloc(raw_inode_slab, GFP_KERNEL);
166	dbg_memalloc("%p\n", ret);
167	return ret;
168}
169
170void jffs2_free_raw_inode(struct jffs2_raw_inode *x)
171{
172	dbg_memalloc("%p\n", x);
173	kmem_cache_free(raw_inode_slab, x);
174}
175
176struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void)
177{
178	struct jffs2_tmp_dnode_info *ret;
179	ret = kmem_cache_alloc(tmp_dnode_info_slab, GFP_KERNEL);
180	dbg_memalloc("%p\n",
181		ret);
182	return ret;
183}
184
185void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *x)
186{
187	dbg_memalloc("%p\n", x);
188	kmem_cache_free(tmp_dnode_info_slab, x);
189}
190
191static struct jffs2_raw_node_ref *jffs2_alloc_refblock(void)
192{
193	struct jffs2_raw_node_ref *ret;
194
195	ret = kmem_cache_alloc(raw_node_ref_slab, GFP_KERNEL);
196	if (ret) {
197		int i = 0;
198		for (i=0; i < REFS_PER_BLOCK; i++) {
199			ret[i].flash_offset = REF_EMPTY_NODE;
200			ret[i].next_in_ino = NULL;
201		}
202		ret[i].flash_offset = REF_LINK_NODE;
203		ret[i].next_in_ino = NULL;
204	}
205	return ret;
206}
207
208int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c,
209				 struct jffs2_eraseblock *jeb, int nr)
210{
211	struct jffs2_raw_node_ref **p, *ref;
212	int i = nr;
213
214	dbg_memalloc("%d\n", nr);
215
216	p = &jeb->last_node;
217	ref = *p;
218
219	dbg_memalloc("Reserving %d refs for block @0x%08x\n", nr, jeb->offset);
220
221	/* If jeb->last_node is really a valid node then skip over it */
222	if (ref && ref->flash_offset != REF_EMPTY_NODE)
223		ref++;
224
225	while (i) {
226		if (!ref) {
227			dbg_memalloc("Allocating new refblock linked from %p\n", p);
228			ref = *p = jffs2_alloc_refblock();
229			if (!ref)
230				return -ENOMEM;
231		}
232		if (ref->flash_offset == REF_LINK_NODE) {
233			p = &ref->next_in_ino;
234			ref = *p;
235			continue;
236		}
237		i--;
238		ref++;
239	}
240	jeb->allocated_refs = nr;
241
242	dbg_memalloc("Reserved %d refs for block @0x%08x, last_node is %p (%08x,%p)\n",
243		  nr, jeb->offset, jeb->last_node, jeb->last_node->flash_offset,
244		  jeb->last_node->next_in_ino);
245
246	return 0;
247}
248
249void jffs2_free_refblock(struct jffs2_raw_node_ref *x)
250{
251	dbg_memalloc("%p\n", x);
252	kmem_cache_free(raw_node_ref_slab, x);
253}
254
255struct jffs2_node_frag *jffs2_alloc_node_frag(void)
256{
257	struct jffs2_node_frag *ret;
258	ret = kmem_cache_alloc(node_frag_slab, GFP_KERNEL);
259	dbg_memalloc("%p\n", ret);
260	return ret;
261}
262
263void jffs2_free_node_frag(struct jffs2_node_frag *x)
264{
265	dbg_memalloc("%p\n", x);
266	kmem_cache_free(node_frag_slab, x);
267}
268
269struct jffs2_inode_cache *jffs2_alloc_inode_cache(void)
270{
271	struct jffs2_inode_cache *ret;
272	ret = kmem_cache_alloc(inode_cache_slab, GFP_KERNEL);
273	dbg_memalloc("%p\n", ret);
274	return ret;
275}
276
277void jffs2_free_inode_cache(struct jffs2_inode_cache *x)
278{
279	dbg_memalloc("%p\n", x);
280	kmem_cache_free(inode_cache_slab, x);
281}
282
283#ifdef CONFIG_JFFS2_FS_XATTR
284struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void)
285{
286	struct jffs2_xattr_datum *xd;
287	xd = kmem_cache_alloc(xattr_datum_cache, GFP_KERNEL);
288	dbg_memalloc("%p\n", xd);
289
290	memset(xd, 0, sizeof(struct jffs2_xattr_datum));
291	xd->class = RAWNODE_CLASS_XATTR_DATUM;
292	xd->node = (void *)xd;
293	INIT_LIST_HEAD(&xd->xindex);
294	return xd;
295}
296
297void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd)
298{
299	dbg_memalloc("%p\n", xd);
300	kmem_cache_free(xattr_datum_cache, xd);
301}
302
303struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void)
304{
305	struct jffs2_xattr_ref *ref;
306	ref = kmem_cache_alloc(xattr_ref_cache, GFP_KERNEL);
307	dbg_memalloc("%p\n", ref);
308
309	memset(ref, 0, sizeof(struct jffs2_xattr_ref));
310	ref->class = RAWNODE_CLASS_XATTR_REF;
311	ref->node = (void *)ref;
312	return ref;
313}
314
315void jffs2_free_xattr_ref(struct jffs2_xattr_ref *ref)
316{
317	dbg_memalloc("%p\n", ref);
318	kmem_cache_free(xattr_ref_cache, ref);
319}
320#endif
321