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 */
22 static struct kmem_cache *full_dnode_slab;
23 static struct kmem_cache *raw_dirent_slab;
24 static struct kmem_cache *raw_inode_slab;
25 static struct kmem_cache *tmp_dnode_info_slab;
26 static struct kmem_cache *raw_node_ref_slab;
27 static struct kmem_cache *node_frag_slab;
28 static struct kmem_cache *inode_cache_slab;
29 #ifdef CONFIG_JFFS2_FS_XATTR
30 static struct kmem_cache *xattr_datum_cache;
31 static struct kmem_cache *xattr_ref_cache;
32 #endif
33 
jffs2_create_slab_caches(void)34 int __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 
jffs2_destroy_slab_caches(void)98 void 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 
jffs2_alloc_full_dirent(int namesize)113 struct 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 
jffs2_free_full_dirent(struct jffs2_full_dirent * x)121 void jffs2_free_full_dirent(struct jffs2_full_dirent *x)
122 {
123 	dbg_memalloc("%p\n", x);
124 	kfree(x);
125 }
126 
jffs2_alloc_full_dnode(void)127 struct 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 
jffs2_free_full_dnode(struct jffs2_full_dnode * x)135 void 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 
jffs2_alloc_raw_dirent(void)141 struct 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 
jffs2_free_raw_dirent(struct jffs2_raw_dirent * x)149 void 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 
jffs2_alloc_raw_inode(void)155 struct 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 
jffs2_free_raw_inode(struct jffs2_raw_inode * x)163 void 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 
jffs2_alloc_tmp_dnode_info(void)169 struct 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 
jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info * x)178 void 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 
jffs2_alloc_refblock(void)184 static 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 
jffs2_prealloc_raw_node_refs(struct jffs2_sb_info * c,struct jffs2_eraseblock * jeb,int nr)201 int 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 
jffs2_free_refblock(struct jffs2_raw_node_ref * x)242 void 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 
jffs2_alloc_node_frag(void)248 struct 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 
jffs2_free_node_frag(struct jffs2_node_frag * x)256 void 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 
jffs2_alloc_inode_cache(void)262 struct 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 
jffs2_free_inode_cache(struct jffs2_inode_cache * x)270 void 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
jffs2_alloc_xattr_datum(void)277 struct 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 
jffs2_free_xattr_datum(struct jffs2_xattr_datum * xd)291 void 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 
jffs2_alloc_xattr_ref(void)297 struct 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 
jffs2_free_xattr_ref(struct jffs2_xattr_ref * ref)310 void 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