linux/fs/jffs2/malloc.c
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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#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 */
  22static struct kmem_cache *full_dnode_slab;
  23static struct kmem_cache *raw_dirent_slab;
  24static struct kmem_cache *raw_inode_slab;
  25static struct kmem_cache *tmp_dnode_info_slab;
  26static struct kmem_cache *raw_node_ref_slab;
  27static struct kmem_cache *node_frag_slab;
  28static struct kmem_cache *inode_cache_slab;
  29#ifdef CONFIG_JFFS2_FS_XATTR
  30static struct kmem_cache *xattr_datum_cache;
  31static struct kmem_cache *xattr_ref_cache;
  32#endif
  33
  34int __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
  98void 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
 122struct 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
 130void jffs2_free_full_dirent(struct jffs2_full_dirent *x)
 131{
 132        dbg_memalloc("%p\n", x);
 133        kfree(x);
 134}
 135
 136struct 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
 144void 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
 150struct 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
 158void 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
 164struct 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
 172void 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
 178struct 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
 187void 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
 193static 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
 210int 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
 251void 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
 257struct 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
 265void 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
 271struct 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
 279void 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
 286struct 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
 292        xd->class = RAWNODE_CLASS_XATTR_DATUM;
 293        xd->node = (void *)xd;
 294        INIT_LIST_HEAD(&xd->xindex);
 295        return xd;
 296}
 297
 298void jffs2_free_xattr_datum(struct jffs2_xattr_datum *xd)
 299{
 300        dbg_memalloc("%p\n", xd);
 301        kmem_cache_free(xattr_datum_cache, xd);
 302}
 303
 304struct jffs2_xattr_ref *jffs2_alloc_xattr_ref(void)
 305{
 306        struct jffs2_xattr_ref *ref;
 307        ref = kmem_cache_zalloc(xattr_ref_cache, GFP_KERNEL);
 308        dbg_memalloc("%p\n", ref);
 309
 310        ref->class = RAWNODE_CLASS_XATTR_REF;
 311        ref->node = (void *)ref;
 312        return ref;
 313}
 314
 315void 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
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