fs/jffs2/malloc.c

   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
  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
  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_zalloc(xattr_datum_cache, GFP_KERNEL);
 290         dbg_memalloc("%p\n", xd);
 291         if (!xd)
 292                 return NULL;
 293
 294         xd->class = RAWNODE_CLASS_XATTR_DATUM;
 295         xd->node = (void *)xd;
 296         INIT_LIST_HEAD(&xd->xindex);
 297         return xd;
 298 }
 299
 300 void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd)
 301 {
 302         dbg_memalloc("%p\n", xd);
 303         kmem_cache_free(xattr_datum_cache, xd);
 304 }
 305
 306 struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void)
 307 {
 308         struct jffs2_xattr_ref *ref;
 309         ref = kmem_cache_zalloc(xattr_ref_cache, GFP_KERNEL);
 310         dbg_memalloc("%p\n", ref);
 311         if (!ref)
 312                 return NULL;
 313
 314         ref->class = RAWNODE_CLASS_XATTR_REF;
 315         ref->node = (void *)ref;
 316         return ref;
 317 }
 318
 319 void jffs2_free_xattr_ref(struct jffs2_xattr_ref *ref)
 320 {
 321         dbg_memalloc("%p\n", ref);
 322         kmem_cache_free(xattr_ref_cache, ref);
 323 }
 324 #endif