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