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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 */ |
20 | static struct kmem_cache *full_dnode_slab; |
21 | static struct kmem_cache *raw_dirent_slab; |
22 | static struct kmem_cache *raw_inode_slab; |
23 | static struct kmem_cache *tmp_dnode_info_slab; |
24 | static struct kmem_cache *raw_node_ref_slab; |
25 | static struct kmem_cache *node_frag_slab; |
26 | static struct kmem_cache *inode_cache_slab; |
27 | #ifdef CONFIG_JFFS2_FS_XATTR |
28 | static struct kmem_cache *xattr_datum_cache; |
29 | static struct kmem_cache *xattr_ref_cache; |
30 | #endif |
31 | |
32 | int __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); |
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, SLAB_HWCACHE_ALIGN, 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, SLAB_HWCACHE_ALIGN, 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); |
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); |
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); |
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); |
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); |
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); |
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 | |
96 | void 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 | |
120 | struct 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 | |
128 | void jffs2_free_full_dirent(struct jffs2_full_dirent *x) |
129 | { |
130 | dbg_memalloc("%p\n", x); |
131 | kfree(x); |
132 | } |
133 | |
134 | struct 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 | |
142 | void 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 | |
148 | struct 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 | |
156 | void 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 | |
162 | struct 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 | |
170 | void 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 | |
176 | struct 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 | |
185 | void 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 | |
191 | static 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 | |
208 | int 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 | |
249 | void 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 | |
255 | struct 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 | |
263 | void 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 | |
269 | struct 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 | |
277 | void 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 |
284 | struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void) |
285 | { |
286 | struct jffs2_xattr_datum *xd; |
287 | xd = kmem_cache_zalloc(xattr_datum_cache, GFP_KERNEL); |
288 | dbg_memalloc("%p\n", xd); |
289 | |
290 | xd->class = RAWNODE_CLASS_XATTR_DATUM; |
291 | xd->node = (void *)xd; |
292 | INIT_LIST_HEAD(&xd->xindex); |
293 | return xd; |
294 | } |
295 | |
296 | void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd) |
297 | { |
298 | dbg_memalloc("%p\n", xd); |
299 | kmem_cache_free(xattr_datum_cache, xd); |
300 | } |
301 | |
302 | struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void) |
303 | { |
304 | struct jffs2_xattr_ref *ref; |
305 | ref = kmem_cache_zalloc(xattr_ref_cache, GFP_KERNEL); |
306 | dbg_memalloc("%p\n", ref); |
307 | |
308 | ref->class = RAWNODE_CLASS_XATTR_REF; |
309 | ref->node = (void *)ref; |
310 | return ref; |
311 | } |
312 | |
313 | void jffs2_free_xattr_ref(struct jffs2_xattr_ref *ref) |
314 | { |
315 | dbg_memalloc("%p\n", ref); |
316 | kmem_cache_free(xattr_ref_cache, ref); |
317 | } |
318 | #endif |
319 |
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