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, 0, 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); 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_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 } 296 297 void 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 } 302 303 struct 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 } 314 315 void 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