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