1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright (C) 2001-2003 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 * $Id: malloc.c,v 1.31 2005/11/07 11:14:40 gleixner Exp $ 11 * 12 */ 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 kmem_cache_t *full_dnode_slab; 23 static kmem_cache_t *raw_dirent_slab; 24 static kmem_cache_t *raw_inode_slab; 25 static kmem_cache_t *tmp_dnode_info_slab; 26 static kmem_cache_t *raw_node_ref_slab; 27 static kmem_cache_t *node_frag_slab; 28 static kmem_cache_t *inode_cache_slab; 29 #ifdef CONFIG_JFFS2_FS_XATTR 30 static kmem_cache_t *xattr_datum_cache; 31 static kmem_cache_t *xattr_ref_cache; 32 #endif 33 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, 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, 0, NULL, 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, 0, NULL, 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, 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, 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, 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, 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, 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, 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 98 void jffs2_destroy_slab_caches(void) 99 { 100 if(full_dnode_slab) 101 kmem_cache_destroy(full_dnode_slab); 102 if(raw_dirent_slab) 103 kmem_cache_destroy(raw_dirent_slab); 104 if(raw_inode_slab) 105 kmem_cache_destroy(raw_inode_slab); 106 if(tmp_dnode_info_slab) 107 kmem_cache_destroy(tmp_dnode_info_slab); 108 if(raw_node_ref_slab) 109 kmem_cache_destroy(raw_node_ref_slab); 110 if(node_frag_slab) 111 kmem_cache_destroy(node_frag_slab); 112 if(inode_cache_slab) 113 kmem_cache_destroy(inode_cache_slab); 114 #ifdef CONFIG_JFFS2_FS_XATTR 115 if (xattr_datum_cache) 116 kmem_cache_destroy(xattr_datum_cache); 117 if (xattr_ref_cache) 118 kmem_cache_destroy(xattr_ref_cache); 119 #endif 120 } 121 122 struct jffs2_full_dirent *jffs2_alloc_full_dirent(int namesize) 123 { 124 struct jffs2_full_dirent *ret; 125 ret = kmalloc(sizeof(struct jffs2_full_dirent) + namesize, GFP_KERNEL); 126 dbg_memalloc("%p\n", ret); 127 return ret; 128 } 129 130 void jffs2_free_full_dirent(struct jffs2_full_dirent *x) 131 { 132 dbg_memalloc("%p\n", x); 133 kfree(x); 134 } 135 136 struct jffs2_full_dnode *jffs2_alloc_full_dnode(void) 137 { 138 struct jffs2_full_dnode *ret; 139 ret = kmem_cache_alloc(full_dnode_slab, GFP_KERNEL); 140 dbg_memalloc("%p\n", ret); 141 return ret; 142 } 143 144 void jffs2_free_full_dnode(struct jffs2_full_dnode *x) 145 { 146 dbg_memalloc("%p\n", x); 147 kmem_cache_free(full_dnode_slab, x); 148 } 149 150 struct jffs2_raw_dirent *jffs2_alloc_raw_dirent(void) 151 { 152 struct jffs2_raw_dirent *ret; 153 ret = kmem_cache_alloc(raw_dirent_slab, GFP_KERNEL); 154 dbg_memalloc("%p\n", ret); 155 return ret; 156 } 157 158 void jffs2_free_raw_dirent(struct jffs2_raw_dirent *x) 159 { 160 dbg_memalloc("%p\n", x); 161 kmem_cache_free(raw_dirent_slab, x); 162 } 163 164 struct jffs2_raw_inode *jffs2_alloc_raw_inode(void) 165 { 166 struct jffs2_raw_inode *ret; 167 ret = kmem_cache_alloc(raw_inode_slab, GFP_KERNEL); 168 dbg_memalloc("%p\n", ret); 169 return ret; 170 } 171 172 void jffs2_free_raw_inode(struct jffs2_raw_inode *x) 173 { 174 dbg_memalloc("%p\n", x); 175 kmem_cache_free(raw_inode_slab, x); 176 } 177 178 struct jffs2_tmp_dnode_info *jffs2_alloc_tmp_dnode_info(void) 179 { 180 struct jffs2_tmp_dnode_info *ret; 181 ret = kmem_cache_alloc(tmp_dnode_info_slab, GFP_KERNEL); 182 dbg_memalloc("%p\n", 183 ret); 184 return ret; 185 } 186 187 void jffs2_free_tmp_dnode_info(struct jffs2_tmp_dnode_info *x) 188 { 189 dbg_memalloc("%p\n", x); 190 kmem_cache_free(tmp_dnode_info_slab, x); 191 } 192 193 static struct jffs2_raw_node_ref *jffs2_alloc_refblock(void) 194 { 195 struct jffs2_raw_node_ref *ret; 196 197 ret = kmem_cache_alloc(raw_node_ref_slab, GFP_KERNEL); 198 if (ret) { 199 int i = 0; 200 for (i=0; i < REFS_PER_BLOCK; i++) { 201 ret[i].flash_offset = REF_EMPTY_NODE; 202 ret[i].next_in_ino = NULL; 203 } 204 ret[i].flash_offset = REF_LINK_NODE; 205 ret[i].next_in_ino = NULL; 206 } 207 return ret; 208 } 209 210 int jffs2_prealloc_raw_node_refs(struct jffs2_sb_info *c, 211 struct jffs2_eraseblock *jeb, int nr) 212 { 213 struct jffs2_raw_node_ref **p, *ref; 214 int i = nr; 215 216 dbg_memalloc("%d\n", nr); 217 218 p = &jeb->last_node; 219 ref = *p; 220 221 dbg_memalloc("Reserving %d refs for block @0x%08x\n", nr, jeb->offset); 222 223 /* If jeb->last_node is really a valid node then skip over it */ 224 if (ref && ref->flash_offset != REF_EMPTY_NODE) 225 ref++; 226 227 while (i) { 228 if (!ref) { 229 dbg_memalloc("Allocating new refblock linked from %p\n", p); 230 ref = *p = jffs2_alloc_refblock(); 231 if (!ref) 232 return -ENOMEM; 233 } 234 if (ref->flash_offset == REF_LINK_NODE) { 235 p = &ref->next_in_ino; 236 ref = *p; 237 continue; 238 } 239 i--; 240 ref++; 241 } 242 jeb->allocated_refs = nr; 243 244 dbg_memalloc("Reserved %d refs for block @0x%08x, last_node is %p (%08x,%p)\n", 245 nr, jeb->offset, jeb->last_node, jeb->last_node->flash_offset, 246 jeb->last_node->next_in_ino); 247 248 return 0; 249 } 250 251 void jffs2_free_refblock(struct jffs2_raw_node_ref *x) 252 { 253 dbg_memalloc("%p\n", x); 254 kmem_cache_free(raw_node_ref_slab, x); 255 } 256 257 struct jffs2_node_frag *jffs2_alloc_node_frag(void) 258 { 259 struct jffs2_node_frag *ret; 260 ret = kmem_cache_alloc(node_frag_slab, GFP_KERNEL); 261 dbg_memalloc("%p\n", ret); 262 return ret; 263 } 264 265 void jffs2_free_node_frag(struct jffs2_node_frag *x) 266 { 267 dbg_memalloc("%p\n", x); 268 kmem_cache_free(node_frag_slab, x); 269 } 270 271 struct jffs2_inode_cache *jffs2_alloc_inode_cache(void) 272 { 273 struct jffs2_inode_cache *ret; 274 ret = kmem_cache_alloc(inode_cache_slab, GFP_KERNEL); 275 dbg_memalloc("%p\n", ret); 276 return ret; 277 } 278 279 void jffs2_free_inode_cache(struct jffs2_inode_cache *x) 280 { 281 dbg_memalloc("%p\n", x); 282 kmem_cache_free(inode_cache_slab, x); 283 } 284 285 #ifdef CONFIG_JFFS2_FS_XATTR 286 struct jffs2_xattr_datum *jffs2_alloc_xattr_datum(void) 287 { 288 struct jffs2_xattr_datum *xd; 289 xd = kmem_cache_alloc(xattr_datum_cache, GFP_KERNEL); 290 dbg_memalloc("%p\n", xd); 291 292 memset(xd, 0, sizeof(struct jffs2_xattr_datum)); 293 xd->class = RAWNODE_CLASS_XATTR_DATUM; 294 xd->node = (void *)xd; 295 INIT_LIST_HEAD(&xd->xindex); 296 return xd; 297 } 298 299 void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd) 300 { 301 dbg_memalloc("%p\n", xd); 302 kmem_cache_free(xattr_datum_cache, xd); 303 } 304 305 struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void) 306 { 307 struct jffs2_xattr_ref *ref; 308 ref = kmem_cache_alloc(xattr_ref_cache, GFP_KERNEL); 309 dbg_memalloc("%p\n", ref); 310 311 memset(ref, 0, sizeof(struct jffs2_xattr_ref)); 312 ref->class = RAWNODE_CLASS_XATTR_REF; 313 ref->node = (void *)ref; 314 return ref; 315 } 316 317 void jffs2_free_xattr_ref(struct jffs2_xattr_ref *ref) 318 { 319 dbg_memalloc("%p\n", ref); 320 kmem_cache_free(xattr_ref_cache, ref); 321 } 322 #endif 323