git.oblomov.eu Git - linux-2.6/blob - fs/hfsplus/bnode.c

   1 /*
   2  *  linux/fs/hfsplus/bnode.c
   3  *
   4  * Copyright (C) 2001
   5  * Brad Boyer (flar@allandria.com)
   6  * (C) 2003 Ardis Technologies <roman@ardistech.com>
   7  *
   8  * Handle basic btree node operations
   9  */
  10
  11 #include <linux/string.h>
  12 #include <linux/slab.h>
  13 #include <linux/pagemap.h>
  14 #include <linux/fs.h>
  15 #include <linux/swap.h>
  16 #include <linux/version.h>
  17
  18 #include "hfsplus_fs.h"
  19 #include "hfsplus_raw.h"
  20
  21 /* Copy a specified range of bytes from the raw data of a node */
  22 void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len)
  23 {
  24         struct page **pagep;
  25         int l;
  26
  27         off += node->page_offset;
  28         pagep = node->page + (off >> PAGE_CACHE_SHIFT);
  29         off &= ~PAGE_CACHE_MASK;
  30
  31         l = min(len, (int)PAGE_CACHE_SIZE - off);
  32         memcpy(buf, kmap(*pagep) + off, l);
  33         kunmap(*pagep);
  34
  35         while ((len -= l) != 0) {
  36                 buf += l;
  37                 l = min(len, (int)PAGE_CACHE_SIZE);
  38                 memcpy(buf, kmap(*++pagep), l);
  39                 kunmap(*pagep);
  40         }
  41 }
  42
  43 u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off)
  44 {
  45         __be16 data;
  46         // optimize later...
  47         hfs_bnode_read(node, &data, off, 2);
  48         return be16_to_cpu(data);
  49 }
  50
  51 u8 hfs_bnode_read_u8(struct hfs_bnode *node, int off)
  52 {
  53         u8 data;
  54         // optimize later...
  55         hfs_bnode_read(node, &data, off, 1);
  56         return data;
  57 }
  58
  59 void hfs_bnode_read_key(struct hfs_bnode *node, void *key, int off)
  60 {
  61         struct hfs_btree *tree;
  62         int key_len;
  63
  64         tree = node->tree;
  65         if (node->type == HFS_NODE_LEAF ||
  66             tree->attributes & HFS_TREE_VARIDXKEYS)
  67                 key_len = hfs_bnode_read_u16(node, off) + 2;
  68         else
  69                 key_len = tree->max_key_len + 2;
  70
  71         hfs_bnode_read(node, key, off, key_len);
  72 }
  73
  74 void hfs_bnode_write(struct hfs_bnode *node, void *buf, int off, int len)
  75 {
  76         struct page **pagep;
  77         int l;
  78
  79         off += node->page_offset;
  80         pagep = node->page + (off >> PAGE_CACHE_SHIFT);
  81         off &= ~PAGE_CACHE_MASK;
  82
  83         l = min(len, (int)PAGE_CACHE_SIZE - off);
  84         memcpy(kmap(*pagep) + off, buf, l);
  85         set_page_dirty(*pagep);
  86         kunmap(*pagep);
  87
  88         while ((len -= l) != 0) {
  89                 buf += l;
  90                 l = min(len, (int)PAGE_CACHE_SIZE);
  91                 memcpy(kmap(*++pagep), buf, l);
  92                 set_page_dirty(*pagep);
  93                 kunmap(*pagep);
  94         }
  95 }
  96
  97 void hfs_bnode_write_u16(struct hfs_bnode *node, int off, u16 data)
  98 {
  99         __be16 v = cpu_to_be16(data);
 100         // optimize later...
 101         hfs_bnode_write(node, &v, off, 2);
 102 }
 103
 104 void hfs_bnode_clear(struct hfs_bnode *node, int off, int len)
 105 {
 106         struct page **pagep;
 107         int l;
 108
 109         off += node->page_offset;
 110         pagep = node->page + (off >> PAGE_CACHE_SHIFT);
 111         off &= ~PAGE_CACHE_MASK;
 112
 113         l = min(len, (int)PAGE_CACHE_SIZE - off);
 114         memset(kmap(*pagep) + off, 0, l);
 115         set_page_dirty(*pagep);
 116         kunmap(*pagep);
 117
 118         while ((len -= l) != 0) {
 119                 l = min(len, (int)PAGE_CACHE_SIZE);
 120                 memset(kmap(*++pagep), 0, l);
 121                 set_page_dirty(*pagep);
 122                 kunmap(*pagep);
 123         }
 124 }
 125
 126 void hfs_bnode_copy(struct hfs_bnode *dst_node, int dst,
 127                     struct hfs_bnode *src_node, int src, int len)
 128 {
 129         struct hfs_btree *tree;
 130         struct page **src_page, **dst_page;
 131         int l;
 132
 133         dprint(DBG_BNODE_MOD, "copybytes: %u,%u,%u\n", dst, src, len);
 134         if (!len)
 135                 return;
 136         tree = src_node->tree;
 137         src += src_node->page_offset;
 138         dst += dst_node->page_offset;
 139         src_page = src_node->page + (src >> PAGE_CACHE_SHIFT);
 140         src &= ~PAGE_CACHE_MASK;
 141         dst_page = dst_node->page + (dst >> PAGE_CACHE_SHIFT);
 142         dst &= ~PAGE_CACHE_MASK;
 143
 144         if (src == dst) {
 145                 l = min(len, (int)PAGE_CACHE_SIZE - src);
 146                 memcpy(kmap(*dst_page) + src, kmap(*src_page) + src, l);
 147                 kunmap(*src_page);
 148                 set_page_dirty(*dst_page);
 149                 kunmap(*dst_page);
 150
 151                 while ((len -= l) != 0) {
 152                         l = min(len, (int)PAGE_CACHE_SIZE);
 153                         memcpy(kmap(*++dst_page), kmap(*++src_page), l);
 154                         kunmap(*src_page);
 155                         set_page_dirty(*dst_page);
 156                         kunmap(*dst_page);
 157                 }
 158         } else {
 159                 void *src_ptr, *dst_ptr;
 160
 161                 do {
 162                         src_ptr = kmap(*src_page) + src;
 163                         dst_ptr = kmap(*dst_page) + dst;
 164                         if (PAGE_CACHE_SIZE - src < PAGE_CACHE_SIZE - dst) {
 165                                 l = PAGE_CACHE_SIZE - src;
 166                                 src = 0;
 167                                 dst += l;
 168                         } else {
 169                                 l = PAGE_CACHE_SIZE - dst;
 170                                 src += l;
 171                                 dst = 0;
 172                         }
 173                         l = min(len, l);
 174                         memcpy(dst_ptr, src_ptr, l);
 175                         kunmap(*src_page);
 176                         set_page_dirty(*dst_page);
 177                         kunmap(*dst_page);
 178                         if (!dst)
 179                                 dst_page++;
 180                         else
 181                                 src_page++;
 182                 } while ((len -= l));
 183         }
 184 }
 185
 186 void hfs_bnode_move(struct hfs_bnode *node, int dst, int src, int len)
 187 {
 188         struct page **src_page, **dst_page;
 189         int l;
 190
 191         dprint(DBG_BNODE_MOD, "movebytes: %u,%u,%u\n", dst, src, len);
 192         if (!len)
 193                 return;
 194         src += node->page_offset;
 195         dst += node->page_offset;
 196         if (dst > src) {
 197                 src += len - 1;
 198                 src_page = node->page + (src >> PAGE_CACHE_SHIFT);
 199                 src = (src & ~PAGE_CACHE_MASK) + 1;
 200                 dst += len - 1;
 201                 dst_page = node->page + (dst >> PAGE_CACHE_SHIFT);
 202                 dst = (dst & ~PAGE_CACHE_MASK) + 1;
 203
 204                 if (src == dst) {
 205                         while (src < len) {
 206                                 memmove(kmap(*dst_page), kmap(*src_page), src);
 207                                 kunmap(*src_page);
 208                                 set_page_dirty(*dst_page);
 209                                 kunmap(*dst_page);
 210                                 len -= src;
 211                                 src = PAGE_CACHE_SIZE;
 212                                 src_page--;
 213                                 dst_page--;
 214                         }
 215                         src -= len;
 216                         memmove(kmap(*dst_page) + src, kmap(*src_page) + src, len);
 217                         kunmap(*src_page);
 218                         set_page_dirty(*dst_page);
 219                         kunmap(*dst_page);
 220                 } else {
 221                         void *src_ptr, *dst_ptr;
 222
 223                         do {
 224                                 src_ptr = kmap(*src_page) + src;
 225                                 dst_ptr = kmap(*dst_page) + dst;
 226                                 if (src < dst) {
 227                                         l = src;
 228                                         src = PAGE_CACHE_SIZE;
 229                                         dst -= l;
 230                                 } else {
 231                                         l = dst;
 232                                         src -= l;
 233                                         dst = PAGE_CACHE_SIZE;
 234                                 }
 235                                 l = min(len, l);
 236                                 memmove(dst_ptr - l, src_ptr - l, l);
 237                                 kunmap(*src_page);
 238                                 set_page_dirty(*dst_page);
 239                                 kunmap(*dst_page);
 240                                 if (dst == PAGE_CACHE_SIZE)
 241                                         dst_page--;
 242                                 else
 243                                         src_page--;
 244                         } while ((len -= l));
 245                 }
 246         } else {
 247                 src_page = node->page + (src >> PAGE_CACHE_SHIFT);
 248                 src &= ~PAGE_CACHE_MASK;
 249                 dst_page = node->page + (dst >> PAGE_CACHE_SHIFT);
 250                 dst &= ~PAGE_CACHE_MASK;
 251
 252                 if (src == dst) {
 253                         l = min(len, (int)PAGE_CACHE_SIZE - src);
 254                         memmove(kmap(*dst_page) + src, kmap(*src_page) + src, l);
 255                         kunmap(*src_page);
 256                         set_page_dirty(*dst_page);
 257                         kunmap(*dst_page);
 258
 259                         while ((len -= l) != 0) {
 260                                 l = min(len, (int)PAGE_CACHE_SIZE);
 261                                 memmove(kmap(*++dst_page), kmap(*++src_page), l);
 262                                 kunmap(*src_page);
 263                                 set_page_dirty(*dst_page);
 264                                 kunmap(*dst_page);
 265                         }
 266                 } else {
 267                         void *src_ptr, *dst_ptr;
 268
 269                         do {
 270                                 src_ptr = kmap(*src_page) + src;
 271                                 dst_ptr = kmap(*dst_page) + dst;
 272                                 if (PAGE_CACHE_SIZE - src < PAGE_CACHE_SIZE - dst) {
 273                                         l = PAGE_CACHE_SIZE - src;
 274                                         src = 0;
 275                                         dst += l;
 276                                 } else {
 277                                         l = PAGE_CACHE_SIZE - dst;
 278                                         src += l;
 279                                         dst = 0;
 280                                 }
 281                                 l = min(len, l);
 282                                 memmove(dst_ptr, src_ptr, l);
 283                                 kunmap(*src_page);
 284                                 set_page_dirty(*dst_page);
 285                                 kunmap(*dst_page);
 286                                 if (!dst)
 287                                         dst_page++;
 288                                 else
 289                                         src_page++;
 290                         } while ((len -= l));
 291                 }
 292         }
 293 }
 294
 295 void hfs_bnode_dump(struct hfs_bnode *node)
 296 {
 297         struct hfs_bnode_desc desc;
 298         __be32 cnid;
 299         int i, off, key_off;
 300
 301         dprint(DBG_BNODE_MOD, "bnode: %d\n", node->this);
 302         hfs_bnode_read(node, &desc, 0, sizeof(desc));
 303         dprint(DBG_BNODE_MOD, "%d, %d, %d, %d, %d\n",
 304                 be32_to_cpu(desc.next), be32_to_cpu(desc.prev),
 305                 desc.type, desc.height, be16_to_cpu(desc.num_recs));
 306
 307         off = node->tree->node_size - 2;
 308         for (i = be16_to_cpu(desc.num_recs); i >= 0; off -= 2, i--) {
 309                 key_off = hfs_bnode_read_u16(node, off);
 310                 dprint(DBG_BNODE_MOD, " %d", key_off);
 311                 if (i && node->type == HFS_NODE_INDEX) {
 312                         int tmp;
 313
 314                         if (node->tree->attributes & HFS_TREE_VARIDXKEYS)
 315                                 tmp = hfs_bnode_read_u16(node, key_off) + 2;
 316                         else
 317                                 tmp = node->tree->max_key_len + 2;
 318                         dprint(DBG_BNODE_MOD, " (%d", tmp);
 319                         hfs_bnode_read(node, &cnid, key_off + tmp, 4);
 320                         dprint(DBG_BNODE_MOD, ",%d)", be32_to_cpu(cnid));
 321                 } else if (i && node->type == HFS_NODE_LEAF) {
 322                         int tmp;
 323
 324                         tmp = hfs_bnode_read_u16(node, key_off);
 325                         dprint(DBG_BNODE_MOD, " (%d)", tmp);
 326                 }
 327         }
 328         dprint(DBG_BNODE_MOD, "\n");
 329 }
 330
 331 void hfs_bnode_unlink(struct hfs_bnode *node)
 332 {
 333         struct hfs_btree *tree;
 334         struct hfs_bnode *tmp;
 335         __be32 cnid;
 336
 337         tree = node->tree;
 338         if (node->prev) {
 339                 tmp = hfs_bnode_find(tree, node->prev);
 340                 if (IS_ERR(tmp))
 341                         return;
 342                 tmp->next = node->next;
 343                 cnid = cpu_to_be32(tmp->next);
 344                 hfs_bnode_write(tmp, &cnid, offsetof(struct hfs_bnode_desc, next), 4);
 345                 hfs_bnode_put(tmp);
 346         } else if (node->type == HFS_NODE_LEAF)
 347                 tree->leaf_head = node->next;
 348
 349         if (node->next) {
 350                 tmp = hfs_bnode_find(tree, node->next);
 351                 if (IS_ERR(tmp))
 352                         return;
 353                 tmp->prev = node->prev;
 354                 cnid = cpu_to_be32(tmp->prev);
 355                 hfs_bnode_write(tmp, &cnid, offsetof(struct hfs_bnode_desc, prev), 4);
 356                 hfs_bnode_put(tmp);
 357         } else if (node->type == HFS_NODE_LEAF)
 358                 tree->leaf_tail = node->prev;
 359
 360         // move down?
 361         if (!node->prev && !node->next) {
 362                 printk("hfs_btree_del_level\n");
 363         }
 364         if (!node->parent) {
 365                 tree->root = 0;
 366                 tree->depth = 0;
 367         }
 368         set_bit(HFS_BNODE_DELETED, &node->flags);
 369 }
 370
 371 static inline int hfs_bnode_hash(u32 num)
 372 {
 373         num = (num >> 16) + num;
 374         num += num >> 8;
 375         return num & (NODE_HASH_SIZE - 1);
 376 }
 377
 378 struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *tree, u32 cnid)
 379 {
 380         struct hfs_bnode *node;
 381
 382         if (cnid >= tree->node_count) {
 383                 printk("HFS+-fs: request for non-existent node %d in B*Tree\n", cnid);
 384                 return NULL;
 385         }
 386
 387         for (node = tree->node_hash[hfs_bnode_hash(cnid)];
 388              node; node = node->next_hash) {
 389                 if (node->this == cnid) {
 390                         return node;
 391                 }
 392         }
 393         return NULL;
 394 }
 395
 396 static struct hfs_bnode *__hfs_bnode_create(struct hfs_btree *tree, u32 cnid)
 397 {
 398         struct super_block *sb;
 399         struct hfs_bnode *node, *node2;
 400         struct address_space *mapping;
 401         struct page *page;
 402         int size, block, i, hash;
 403         loff_t off;
 404
 405         if (cnid >= tree->node_count) {
 406                 printk("HFS+-fs: request for non-existent node %d in B*Tree\n", cnid);
 407                 return NULL;
 408         }
 409
 410         sb = tree->inode->i_sb;
 411         size = sizeof(struct hfs_bnode) + tree->pages_per_bnode *
 412                 sizeof(struct page *);
 413         node = kmalloc(size, GFP_KERNEL);
 414         if (!node)
 415                 return NULL;
 416         memset(node, 0, size);
 417         node->tree = tree;
 418         node->this = cnid;
 419         set_bit(HFS_BNODE_NEW, &node->flags);
 420         atomic_set(&node->refcnt, 1);
 421         dprint(DBG_BNODE_REFS, "new_node(%d:%d): 1\n",
 422                node->tree->cnid, node->this);
 423         init_waitqueue_head(&node->lock_wq);
 424         spin_lock(&tree->hash_lock);
 425         node2 = hfs_bnode_findhash(tree, cnid);
 426         if (!node2) {
 427                 hash = hfs_bnode_hash(cnid);
 428                 node->next_hash = tree->node_hash[hash];
 429                 tree->node_hash[hash] = node;
 430                 tree->node_hash_cnt++;
 431         } else {
 432                 spin_unlock(&tree->hash_lock);
 433                 kfree(node);
 434                 wait_event(node2->lock_wq, !test_bit(HFS_BNODE_NEW, &node2->flags));
 435                 return node2;
 436         }
 437         spin_unlock(&tree->hash_lock);
 438
 439         mapping = tree->inode->i_mapping;
 440         off = (loff_t)cnid << tree->node_size_shift;
 441         block = off >> PAGE_CACHE_SHIFT;
 442         node->page_offset = off & ~PAGE_CACHE_MASK;
 443         for (i = 0; i < tree->pages_per_bnode; block++, i++) {
 444                 page = read_cache_page(mapping, block, (filler_t *)mapping->a_ops->readpage, NULL);
 445                 if (IS_ERR(page))
 446                         goto fail;
 447                 if (PageError(page)) {
 448                         page_cache_release(page);
 449                         goto fail;
 450                 }
 451                 page_cache_release(page);
 452                 node->page[i] = page;
 453         }
 454
 455         return node;
 456 fail:
 457         set_bit(HFS_BNODE_ERROR, &node->flags);
 458         return node;
 459 }
 460
 461 void hfs_bnode_unhash(struct hfs_bnode *node)
 462 {
 463         struct hfs_bnode **p;
 464
 465         dprint(DBG_BNODE_REFS, "remove_node(%d:%d): %d\n",
 466                 node->tree->cnid, node->this, atomic_read(&node->refcnt));
 467         for (p = &node->tree->node_hash[hfs_bnode_hash(node->this)];
 468              *p && *p != node; p = &(*p)->next_hash)
 469                 ;
 470         if (!*p)
 471                 BUG();
 472         *p = node->next_hash;
 473         node->tree->node_hash_cnt--;
 474 }
 475
 476 /* Load a particular node out of a tree */
 477 struct hfs_bnode *hfs_bnode_find(struct hfs_btree *tree, u32 num)
 478 {
 479         struct hfs_bnode *node;
 480         struct hfs_bnode_desc *desc;
 481         int i, rec_off, off, next_off;
 482         int entry_size, key_size;
 483
 484         spin_lock(&tree->hash_lock);
 485         node = hfs_bnode_findhash(tree, num);
 486         if (node) {
 487                 hfs_bnode_get(node);
 488                 spin_unlock(&tree->hash_lock);
 489                 wait_event(node->lock_wq, !test_bit(HFS_BNODE_NEW, &node->flags));
 490                 if (test_bit(HFS_BNODE_ERROR, &node->flags))
 491                         goto node_error;
 492                 return node;
 493         }
 494         spin_unlock(&tree->hash_lock);
 495         node = __hfs_bnode_create(tree, num);
 496         if (!node)
 497                 return ERR_PTR(-ENOMEM);
 498         if (test_bit(HFS_BNODE_ERROR, &node->flags))
 499                 goto node_error;
 500         if (!test_bit(HFS_BNODE_NEW, &node->flags))
 501                 return node;
 502
 503         desc = (struct hfs_bnode_desc *)(kmap(node->page[0]) + node->page_offset);
 504         node->prev = be32_to_cpu(desc->prev);
 505         node->next = be32_to_cpu(desc->next);
 506         node->num_recs = be16_to_cpu(desc->num_recs);
 507         node->type = desc->type;
 508         node->height = desc->height;
 509         kunmap(node->page[0]);
 510
 511         switch (node->type) {
 512         case HFS_NODE_HEADER:
 513         case HFS_NODE_MAP:
 514                 if (node->height != 0)
 515                         goto node_error;
 516                 break;
 517         case HFS_NODE_LEAF:
 518                 if (node->height != 1)
 519                         goto node_error;
 520                 break;
 521         case HFS_NODE_INDEX:
 522                 if (node->height <= 1 || node->height > tree->depth)
 523                         goto node_error;
 524                 break;
 525         default:
 526                 goto node_error;
 527         }
 528
 529         rec_off = tree->node_size - 2;
 530         off = hfs_bnode_read_u16(node, rec_off);
 531         if (off != sizeof(struct hfs_bnode_desc))
 532                 goto node_error;
 533         for (i = 1; i <= node->num_recs; off = next_off, i++) {
 534                 rec_off -= 2;
 535                 next_off = hfs_bnode_read_u16(node, rec_off);
 536                 if (next_off <= off ||
 537                     next_off > tree->node_size ||
 538                     next_off & 1)
 539                         goto node_error;
 540                 entry_size = next_off - off;
 541                 if (node->type != HFS_NODE_INDEX &&
 542                     node->type != HFS_NODE_LEAF)
 543                         continue;
 544                 key_size = hfs_bnode_read_u16(node, off) + 2;
 545                 if (key_size >= entry_size || key_size & 1)
 546                         goto node_error;
 547         }
 548         clear_bit(HFS_BNODE_NEW, &node->flags);
 549         wake_up(&node->lock_wq);
 550         return node;
 551
 552 node_error:
 553         set_bit(HFS_BNODE_ERROR, &node->flags);
 554         clear_bit(HFS_BNODE_NEW, &node->flags);
 555         wake_up(&node->lock_wq);
 556         hfs_bnode_put(node);
 557         return ERR_PTR(-EIO);
 558 }
 559
 560 void hfs_bnode_free(struct hfs_bnode *node)
 561 {
 562         //int i;
 563
 564         //for (i = 0; i < node->tree->pages_per_bnode; i++)
 565         //      if (node->page[i])
 566         //              page_cache_release(node->page[i]);
 567         kfree(node);
 568 }
 569
 570 struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num)
 571 {
 572         struct hfs_bnode *node;
 573         struct page **pagep;
 574         int i;
 575
 576         spin_lock(&tree->hash_lock);
 577         node = hfs_bnode_findhash(tree, num);
 578         spin_unlock(&tree->hash_lock);
 579         if (node) {
 580                 printk("new node %u already hashed?\n", num);
 581                 BUG();
 582         }
 583         node = __hfs_bnode_create(tree, num);
 584         if (!node)
 585                 return ERR_PTR(-ENOMEM);
 586         if (test_bit(HFS_BNODE_ERROR, &node->flags)) {
 587                 hfs_bnode_put(node);
 588                 return ERR_PTR(-EIO);
 589         }
 590
 591         pagep = node->page;
 592         memset(kmap(*pagep) + node->page_offset, 0,
 593                min((int)PAGE_CACHE_SIZE, (int)tree->node_size));
 594         set_page_dirty(*pagep);
 595         kunmap(*pagep);
 596         for (i = 1; i < tree->pages_per_bnode; i++) {
 597                 memset(kmap(*++pagep), 0, PAGE_CACHE_SIZE);
 598                 set_page_dirty(*pagep);
 599                 kunmap(*pagep);
 600         }
 601         clear_bit(HFS_BNODE_NEW, &node->flags);
 602         wake_up(&node->lock_wq);
 603
 604         return node;
 605 }
 606
 607 void hfs_bnode_get(struct hfs_bnode *node)
 608 {
 609         if (node) {
 610                 atomic_inc(&node->refcnt);
 611                 dprint(DBG_BNODE_REFS, "get_node(%d:%d): %d\n",
 612                        node->tree->cnid, node->this, atomic_read(&node->refcnt));
 613         }
 614 }
 615
 616 /* Dispose of resources used by a node */
 617 void hfs_bnode_put(struct hfs_bnode *node)
 618 {
 619         if (node) {
 620                 struct hfs_btree *tree = node->tree;
 621                 int i;
 622
 623                 dprint(DBG_BNODE_REFS, "put_node(%d:%d): %d\n",
 624                        node->tree->cnid, node->this, atomic_read(&node->refcnt));
 625                 if (!atomic_read(&node->refcnt))
 626                         BUG();
 627                 if (!atomic_dec_and_lock(&node->refcnt, &tree->hash_lock))
 628                         return;
 629                 for (i = 0; i < tree->pages_per_bnode; i++) {
 630                         if (!node->page[i])
 631                                 continue;
 632                         mark_page_accessed(node->page[i]);
 633                 }
 634
 635                 if (test_bit(HFS_BNODE_DELETED, &node->flags)) {
 636                         hfs_bnode_unhash(node);
 637                         spin_unlock(&tree->hash_lock);
 638                         hfs_bmap_free(node);
 639                         hfs_bnode_free(node);
 640                         return;
 641                 }
 642                 spin_unlock(&tree->hash_lock);
 643         }
 644 }
 645