fs/f2fs/extent_cache.c

   1 /*
   2  * f2fs extent cache support
   3  *
   4  * Copyright (c) 2015 Motorola Mobility
   5  * Copyright (c) 2015 Samsung Electronics
   6  * Authors: Jaegeuk Kim <jaegeuk@kernel.org>
   7  *          Chao Yu <chao2.yu@samsung.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/fs.h>
  15 #include <linux/f2fs_fs.h>
  16
  17 #include "f2fs.h"
  18 #include "node.h"
  19 #include <trace/events/f2fs.h>
  20
  21 static struct kmem_cache *extent_tree_slab;
  22 static struct kmem_cache *extent_node_slab;
  23
  24 static struct extent_node *__attach_extent_node(struct f2fs_sb_info *sbi,
  25                                 struct extent_tree *et, struct extent_info *ei,
  26                                 struct rb_node *parent, struct rb_node **p)
  27 {
  28         struct extent_node *en;
  29
  30         en = kmem_cache_alloc(extent_node_slab, GFP_ATOMIC);
  31         if (!en)
  32                 return NULL;
  33
  34         en->ei = *ei;
  35         INIT_LIST_HEAD(&en->list);
  36
  37         rb_link_node(&en->rb_node, parent, p);
  38         rb_insert_color(&en->rb_node, &et->root);
  39         atomic_inc(&et->node_cnt);
  40         atomic_inc(&sbi->total_ext_node);
  41         return en;
  42 }
  43
  44 static void __detach_extent_node(struct f2fs_sb_info *sbi,
  45                                 struct extent_tree *et, struct extent_node *en)
  46 {
  47         rb_erase(&en->rb_node, &et->root);
  48         atomic_dec(&et->node_cnt);
  49         atomic_dec(&sbi->total_ext_node);
  50
  51         if (et->cached_en == en)
  52                 et->cached_en = NULL;
  53 }
  54
  55 static struct extent_tree *__grab_extent_tree(struct inode *inode)
  56 {
  57         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
  58         struct extent_tree *et;
  59         nid_t ino = inode->i_ino;
  60
  61         down_write(&sbi->extent_tree_lock);
  62         et = radix_tree_lookup(&sbi->extent_tree_root, ino);
  63         if (!et) {
  64                 et = f2fs_kmem_cache_alloc(extent_tree_slab, GFP_NOFS);
  65                 f2fs_radix_tree_insert(&sbi->extent_tree_root, ino, et);
  66                 memset(et, 0, sizeof(struct extent_tree));
  67                 et->ino = ino;
  68                 et->root = RB_ROOT;
  69                 et->cached_en = NULL;
  70                 rwlock_init(&et->lock);
  71                 INIT_LIST_HEAD(&et->list);
  72                 atomic_set(&et->node_cnt, 0);
  73                 atomic_inc(&sbi->total_ext_tree);
  74         } else {
  75                 atomic_dec(&sbi->total_zombie_tree);
  76                 list_del_init(&et->list);
  77         }
  78         up_write(&sbi->extent_tree_lock);
  79
  80         /* never died until evict_inode */
  81         F2FS_I(inode)->extent_tree = et;
  82
  83         return et;
  84 }
  85
  86 static struct extent_node *__lookup_extent_tree(struct f2fs_sb_info *sbi,
  87                                 struct extent_tree *et, unsigned int fofs)
  88 {
  89         struct rb_node *node = et->root.rb_node;
  90         struct extent_node *en = et->cached_en;
  91
  92         if (en) {
  93                 struct extent_info *cei = &en->ei;
  94
  95                 if (cei->fofs <= fofs && cei->fofs + cei->len > fofs) {
  96                         stat_inc_cached_node_hit(sbi);
  97                         return en;
  98                 }
  99         }
 100
 101         while (node) {
 102                 en = rb_entry(node, struct extent_node, rb_node);
 103
 104                 if (fofs < en->ei.fofs) {
 105                         node = node->rb_left;
 106                 } else if (fofs >= en->ei.fofs + en->ei.len) {
 107                         node = node->rb_right;
 108                 } else {
 109                         stat_inc_rbtree_node_hit(sbi);
 110                         return en;
 111                 }
 112         }
 113         return NULL;
 114 }
 115
 116 static struct extent_node *__init_extent_tree(struct f2fs_sb_info *sbi,
 117                                 struct extent_tree *et, struct extent_info *ei)
 118 {
 119         struct rb_node **p = &et->root.rb_node;
 120         struct extent_node *en;
 121
 122         en = __attach_extent_node(sbi, et, ei, NULL, p);
 123         if (!en)
 124                 return NULL;
 125
 126         et->largest = en->ei;
 127         et->cached_en = en;
 128         return en;
 129 }
 130
 131 static unsigned int __free_extent_tree(struct f2fs_sb_info *sbi,
 132                                         struct extent_tree *et, bool free_all)
 133 {
 134         struct rb_node *node, *next;
 135         struct extent_node *en;
 136         unsigned int count = atomic_read(&et->node_cnt);
 137
 138         node = rb_first(&et->root);
 139         while (node) {
 140                 next = rb_next(node);
 141                 en = rb_entry(node, struct extent_node, rb_node);
 142
 143                 if (free_all) {
 144                         spin_lock(&sbi->extent_lock);
 145                         if (!list_empty(&en->list))
 146                                 list_del_init(&en->list);
 147                         spin_unlock(&sbi->extent_lock);
 148                 }
 149
 150                 if (free_all || list_empty(&en->list)) {
 151                         __detach_extent_node(sbi, et, en);
 152                         kmem_cache_free(extent_node_slab, en);
 153                 }
 154                 node = next;
 155         }
 156
 157         return count - atomic_read(&et->node_cnt);
 158 }
 159
 160 static void __drop_largest_extent(struct inode *inode,
 161                                         pgoff_t fofs, unsigned int len)
 162 {
 163         struct extent_info *largest = &F2FS_I(inode)->extent_tree->largest;
 164
 165         if (fofs < largest->fofs + largest->len && fofs + len > largest->fofs)
 166                 largest->len = 0;
 167 }
 168
 169 /* return true, if inode page is changed */
 170 bool f2fs_init_extent_tree(struct inode *inode, struct f2fs_extent *i_ext)
 171 {
 172         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 173         struct extent_tree *et;
 174         struct extent_node *en;
 175         struct extent_info ei;
 176
 177         if (!f2fs_may_extent_tree(inode)) {
 178                 /* drop largest extent */
 179                 if (i_ext && i_ext->len) {
 180                         i_ext->len = 0;
 181                         return true;
 182                 }
 183                 return false;
 184         }
 185
 186         et = __grab_extent_tree(inode);
 187
 188         if (!i_ext || !i_ext->len)
 189                 return false;
 190
 191         set_extent_info(&ei, le32_to_cpu(i_ext->fofs),
 192                 le32_to_cpu(i_ext->blk), le32_to_cpu(i_ext->len));
 193
 194         write_lock(&et->lock);
 195         if (atomic_read(&et->node_cnt))
 196                 goto out;
 197
 198         en = __init_extent_tree(sbi, et, &ei);
 199         if (en) {
 200                 spin_lock(&sbi->extent_lock);
 201                 list_add_tail(&en->list, &sbi->extent_list);
 202                 spin_unlock(&sbi->extent_lock);
 203         }
 204 out:
 205         write_unlock(&et->lock);
 206         return false;
 207 }
 208
 209 static bool f2fs_lookup_extent_tree(struct inode *inode, pgoff_t pgofs,
 210                                                         struct extent_info *ei)
 211 {
 212         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 213         struct extent_tree *et = F2FS_I(inode)->extent_tree;
 214         struct extent_node *en;
 215         bool ret = false;
 216
 217         f2fs_bug_on(sbi, !et);
 218
 219         trace_f2fs_lookup_extent_tree_start(inode, pgofs);
 220
 221         read_lock(&et->lock);
 222
 223         if (et->largest.fofs <= pgofs &&
 224                         et->largest.fofs + et->largest.len > pgofs) {
 225                 *ei = et->largest;
 226                 ret = true;
 227                 stat_inc_largest_node_hit(sbi);
 228                 goto out;
 229         }
 230
 231         en = __lookup_extent_tree(sbi, et, pgofs);
 232         if (en) {
 233                 *ei = en->ei;
 234                 spin_lock(&sbi->extent_lock);
 235                 if (!list_empty(&en->list))
 236                         list_move_tail(&en->list, &sbi->extent_list);
 237                 et->cached_en = en;
 238                 spin_unlock(&sbi->extent_lock);
 239                 ret = true;
 240         }
 241 out:
 242         stat_inc_total_hit(sbi);
 243         read_unlock(&et->lock);
 244
 245         trace_f2fs_lookup_extent_tree_end(inode, pgofs, ei);
 246         return ret;
 247 }
 248
 249
 250 /*
 251  * lookup extent at @fofs, if hit, return the extent
 252  * if not, return NULL and
 253  * @prev_ex: extent before fofs
 254  * @next_ex: extent after fofs
 255  * @insert_p: insert point for new extent at fofs
 256  * in order to simpfy the insertion after.
 257  * tree must stay unchanged between lookup and insertion.
 258  */
 259 static struct extent_node *__lookup_extent_tree_ret(struct extent_tree *et,
 260                                 unsigned int fofs,
 261                                 struct extent_node **prev_ex,
 262                                 struct extent_node **next_ex,
 263                                 struct rb_node ***insert_p,
 264                                 struct rb_node **insert_parent)
 265 {
 266         struct rb_node **pnode = &et->root.rb_node;
 267         struct rb_node *parent = NULL, *tmp_node;
 268         struct extent_node *en = et->cached_en;
 269
 270         *insert_p = NULL;
 271         *insert_parent = NULL;
 272         *prev_ex = NULL;
 273         *next_ex = NULL;
 274
 275         if (RB_EMPTY_ROOT(&et->root))
 276                 return NULL;
 277
 278         if (en) {
 279                 struct extent_info *cei = &en->ei;
 280
 281                 if (cei->fofs <= fofs && cei->fofs + cei->len > fofs)
 282                         goto lookup_neighbors;
 283         }
 284
 285         while (*pnode) {
 286                 parent = *pnode;
 287                 en = rb_entry(*pnode, struct extent_node, rb_node);
 288
 289                 if (fofs < en->ei.fofs)
 290                         pnode = &(*pnode)->rb_left;
 291                 else if (fofs >= en->ei.fofs + en->ei.len)
 292                         pnode = &(*pnode)->rb_right;
 293                 else
 294                         goto lookup_neighbors;
 295         }
 296
 297         *insert_p = pnode;
 298         *insert_parent = parent;
 299
 300         en = rb_entry(parent, struct extent_node, rb_node);
 301         tmp_node = parent;
 302         if (parent && fofs > en->ei.fofs)
 303                 tmp_node = rb_next(parent);
 304         *next_ex = tmp_node ?
 305                 rb_entry(tmp_node, struct extent_node, rb_node) : NULL;
 306
 307         tmp_node = parent;
 308         if (parent && fofs < en->ei.fofs)
 309                 tmp_node = rb_prev(parent);
 310         *prev_ex = tmp_node ?
 311                 rb_entry(tmp_node, struct extent_node, rb_node) : NULL;
 312         return NULL;
 313
 314 lookup_neighbors:
 315         if (fofs == en->ei.fofs) {
 316                 /* lookup prev node for merging backward later */
 317                 tmp_node = rb_prev(&en->rb_node);
 318                 *prev_ex = tmp_node ?
 319                         rb_entry(tmp_node, struct extent_node, rb_node) : NULL;
 320         }
 321         if (fofs == en->ei.fofs + en->ei.len - 1) {
 322                 /* lookup next node for merging frontward later */
 323                 tmp_node = rb_next(&en->rb_node);
 324                 *next_ex = tmp_node ?
 325                         rb_entry(tmp_node, struct extent_node, rb_node) : NULL;
 326         }
 327         return en;
 328 }
 329
 330 static struct extent_node *__try_merge_extent_node(struct f2fs_sb_info *sbi,
 331                                 struct extent_tree *et, struct extent_info *ei,
 332                                 struct extent_node **den,
 333                                 struct extent_node *prev_ex,
 334                                 struct extent_node *next_ex)
 335 {
 336         struct extent_node *en = NULL;
 337
 338         if (prev_ex && __is_back_mergeable(ei, &prev_ex->ei)) {
 339                 prev_ex->ei.len += ei->len;
 340                 ei = &prev_ex->ei;
 341                 en = prev_ex;
 342         }
 343
 344         if (next_ex && __is_front_mergeable(ei, &next_ex->ei)) {
 345                 if (en) {
 346                         __detach_extent_node(sbi, et, prev_ex);
 347                         *den = prev_ex;
 348                 }
 349                 next_ex->ei.fofs = ei->fofs;
 350                 next_ex->ei.blk = ei->blk;
 351                 next_ex->ei.len += ei->len;
 352                 en = next_ex;
 353         }
 354
 355         if (en) {
 356                 __try_update_largest_extent(et, en);
 357                 et->cached_en = en;
 358         }
 359         return en;
 360 }
 361
 362 static struct extent_node *__insert_extent_tree(struct f2fs_sb_info *sbi,
 363                                 struct extent_tree *et, struct extent_info *ei,
 364                                 struct rb_node **insert_p,
 365                                 struct rb_node *insert_parent)
 366 {
 367         struct rb_node **p = &et->root.rb_node;
 368         struct rb_node *parent = NULL;
 369         struct extent_node *en = NULL;
 370
 371         if (insert_p && insert_parent) {
 372                 parent = insert_parent;
 373                 p = insert_p;
 374                 goto do_insert;
 375         }
 376
 377         while (*p) {
 378                 parent = *p;
 379                 en = rb_entry(parent, struct extent_node, rb_node);
 380
 381                 if (ei->fofs < en->ei.fofs)
 382                         p = &(*p)->rb_left;
 383                 else if (ei->fofs >= en->ei.fofs + en->ei.len)
 384                         p = &(*p)->rb_right;
 385                 else
 386                         f2fs_bug_on(sbi, 1);
 387         }
 388 do_insert:
 389         en = __attach_extent_node(sbi, et, ei, parent, p);
 390         if (!en)
 391                 return NULL;
 392
 393         __try_update_largest_extent(et, en);
 394         et->cached_en = en;
 395         return en;
 396 }
 397
 398 static unsigned int f2fs_update_extent_tree_range(struct inode *inode,
 399                                 pgoff_t fofs, block_t blkaddr, unsigned int len)
 400 {
 401         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 402         struct extent_tree *et = F2FS_I(inode)->extent_tree;
 403         struct extent_node *en = NULL, *en1 = NULL;
 404         struct extent_node *prev_en = NULL, *next_en = NULL;
 405         struct extent_info ei, dei, prev;
 406         struct rb_node **insert_p = NULL, *insert_parent = NULL;
 407         unsigned int end = fofs + len;
 408         unsigned int pos = (unsigned int)fofs;
 409
 410         if (!et)
 411                 return false;
 412
 413         trace_f2fs_update_extent_tree_range(inode, fofs, blkaddr, len);
 414
 415         write_lock(&et->lock);
 416
 417         if (is_inode_flag_set(F2FS_I(inode), FI_NO_EXTENT)) {
 418                 write_unlock(&et->lock);
 419                 return false;
 420         }
 421
 422         prev = et->largest;
 423         dei.len = 0;
 424
 425         /*
 426          * drop largest extent before lookup, in case it's already
 427          * been shrunk from extent tree
 428          */
 429         __drop_largest_extent(inode, fofs, len);
 430
 431         /* 1. lookup first extent node in range [fofs, fofs + len - 1] */
 432         en = __lookup_extent_tree_ret(et, fofs, &prev_en, &next_en,
 433                                         &insert_p, &insert_parent);
 434         if (!en)
 435                 en = next_en;
 436
 437         /* 2. invlidate all extent nodes in range [fofs, fofs + len - 1] */
 438         while (en && en->ei.fofs < end) {
 439                 unsigned int org_end;
 440                 int parts = 0;  /* # of parts current extent split into */
 441
 442                 next_en = en1 = NULL;
 443
 444                 dei = en->ei;
 445                 org_end = dei.fofs + dei.len;
 446                 f2fs_bug_on(sbi, pos >= org_end);
 447
 448                 if (pos > dei.fofs &&   pos - dei.fofs >= F2FS_MIN_EXTENT_LEN) {
 449                         en->ei.len = pos - en->ei.fofs;
 450                         prev_en = en;
 451                         parts = 1;
 452                 }
 453
 454                 if (end < org_end && org_end - end >= F2FS_MIN_EXTENT_LEN) {
 455                         if (parts) {
 456                                 set_extent_info(&ei, end,
 457                                                 end - dei.fofs + dei.blk,
 458                                                 org_end - end);
 459                                 en1 = __insert_extent_tree(sbi, et, &ei,
 460                                                         NULL, NULL);
 461                                 next_en = en1;
 462                         } else {
 463                                 en->ei.fofs = end;
 464                                 en->ei.blk += end - dei.fofs;
 465                                 en->ei.len -= end - dei.fofs;
 466                                 next_en = en;
 467                         }
 468                         parts++;
 469                 }
 470
 471                 if (!next_en) {
 472                         struct rb_node *node = rb_next(&en->rb_node);
 473
 474                         next_en = node ?
 475                                 rb_entry(node, struct extent_node, rb_node)
 476                                 : NULL;
 477                 }
 478
 479                 if (parts)
 480                         __try_update_largest_extent(et, en);
 481                 else
 482                         __detach_extent_node(sbi, et, en);
 483
 484                 /*
 485                  * if original extent is split into zero or two parts, extent
 486                  * tree has been altered by deletion or insertion, therefore
 487                  * invalidate pointers regard to tree.
 488                  */
 489                 if (parts != 1) {
 490                         insert_p = NULL;
 491                         insert_parent = NULL;
 492                 }
 493
 494                 /* update in global extent list */
 495                 spin_lock(&sbi->extent_lock);
 496                 if (!parts && !list_empty(&en->list))
 497                         list_del(&en->list);
 498                 if (en1)
 499                         list_add_tail(&en1->list, &sbi->extent_list);
 500                 spin_unlock(&sbi->extent_lock);
 501
 502                 /* release extent node */
 503                 if (!parts)
 504                         kmem_cache_free(extent_node_slab, en);
 505
 506                 en = next_en;
 507         }
 508
 509         /* 3. update extent in extent cache */
 510         if (blkaddr) {
 511                 struct extent_node *den = NULL;
 512
 513                 set_extent_info(&ei, fofs, blkaddr, len);
 514                 en1 = __try_merge_extent_node(sbi, et, &ei, &den,
 515                                                         prev_en, next_en);
 516                 if (!en1)
 517                         en1 = __insert_extent_tree(sbi, et, &ei,
 518                                                 insert_p, insert_parent);
 519
 520                 /* give up extent_cache, if split and small updates happen */
 521                 if (dei.len >= 1 &&
 522                                 prev.len < F2FS_MIN_EXTENT_LEN &&
 523                                 et->largest.len < F2FS_MIN_EXTENT_LEN) {
 524                         et->largest.len = 0;
 525                         set_inode_flag(F2FS_I(inode), FI_NO_EXTENT);
 526                 }
 527
 528                 spin_lock(&sbi->extent_lock);
 529                 if (en1) {
 530                         if (list_empty(&en1->list))
 531                                 list_add_tail(&en1->list, &sbi->extent_list);
 532                         else
 533                                 list_move_tail(&en1->list, &sbi->extent_list);
 534                 }
 535                 if (den && !list_empty(&den->list))
 536                         list_del(&den->list);
 537                 spin_unlock(&sbi->extent_lock);
 538
 539                 if (den)
 540                         kmem_cache_free(extent_node_slab, den);
 541         }
 542
 543         if (is_inode_flag_set(F2FS_I(inode), FI_NO_EXTENT))
 544                 __free_extent_tree(sbi, et, true);
 545
 546         write_unlock(&et->lock);
 547
 548         return !__is_extent_same(&prev, &et->largest);
 549 }
 550
 551 unsigned int f2fs_shrink_extent_tree(struct f2fs_sb_info *sbi, int nr_shrink)
 552 {
 553         struct extent_tree *treevec[EXT_TREE_VEC_SIZE];
 554         struct extent_tree *et, *next;
 555         struct extent_node *en, *tmp;
 556         unsigned long ino = F2FS_ROOT_INO(sbi);
 557         unsigned int found;
 558         unsigned int node_cnt = 0, tree_cnt = 0;
 559         int remained;
 560         bool do_free = false;
 561
 562         if (!test_opt(sbi, EXTENT_CACHE))
 563                 return 0;
 564
 565         if (!atomic_read(&sbi->total_zombie_tree))
 566                 goto free_node;
 567
 568         if (!down_write_trylock(&sbi->extent_tree_lock))
 569                 goto out;
 570
 571         /* 1. remove unreferenced extent tree */
 572         list_for_each_entry_safe(et, next, &sbi->zombie_list, list) {
 573                 if (atomic_read(&et->node_cnt)) {
 574                         write_lock(&et->lock);
 575                         node_cnt += __free_extent_tree(sbi, et, true);
 576                         write_unlock(&et->lock);
 577                 }
 578
 579                 list_del_init(&et->list);
 580                 radix_tree_delete(&sbi->extent_tree_root, et->ino);
 581                 kmem_cache_free(extent_tree_slab, et);
 582                 atomic_dec(&sbi->total_ext_tree);
 583                 atomic_dec(&sbi->total_zombie_tree);
 584                 tree_cnt++;
 585
 586                 if (node_cnt + tree_cnt >= nr_shrink)
 587                         goto unlock_out;
 588         }
 589         up_write(&sbi->extent_tree_lock);
 590
 591 free_node:
 592         /* 2. remove LRU extent entries */
 593         if (!down_write_trylock(&sbi->extent_tree_lock))
 594                 goto out;
 595
 596         remained = nr_shrink - (node_cnt + tree_cnt);
 597
 598         spin_lock(&sbi->extent_lock);
 599         list_for_each_entry_safe(en, tmp, &sbi->extent_list, list) {
 600                 if (!remained--)
 601                         break;
 602                 list_del_init(&en->list);
 603                 do_free = true;
 604         }
 605         spin_unlock(&sbi->extent_lock);
 606
 607         if (do_free == false)
 608                 goto unlock_out;
 609
 610         /*
 611          * reset ino for searching victims from beginning of global extent tree.
 612          */
 613         ino = F2FS_ROOT_INO(sbi);
 614
 615         while ((found = radix_tree_gang_lookup(&sbi->extent_tree_root,
 616                                 (void **)treevec, ino, EXT_TREE_VEC_SIZE))) {
 617                 unsigned i;
 618
 619                 ino = treevec[found - 1]->ino + 1;
 620                 for (i = 0; i < found; i++) {
 621                         struct extent_tree *et = treevec[i];
 622
 623                         if (!atomic_read(&et->node_cnt))
 624                                 continue;
 625
 626                         if (write_trylock(&et->lock)) {
 627                                 node_cnt += __free_extent_tree(sbi, et, false);
 628                                 write_unlock(&et->lock);
 629                         }
 630
 631                         if (node_cnt + tree_cnt >= nr_shrink)
 632                                 goto unlock_out;
 633                 }
 634         }
 635 unlock_out:
 636         up_write(&sbi->extent_tree_lock);
 637 out:
 638         trace_f2fs_shrink_extent_tree(sbi, node_cnt, tree_cnt);
 639
 640         return node_cnt + tree_cnt;
 641 }
 642
 643 unsigned int f2fs_destroy_extent_node(struct inode *inode)
 644 {
 645         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 646         struct extent_tree *et = F2FS_I(inode)->extent_tree;
 647         unsigned int node_cnt = 0;
 648
 649         if (!et || !atomic_read(&et->node_cnt))
 650                 return 0;
 651
 652         write_lock(&et->lock);
 653         node_cnt = __free_extent_tree(sbi, et, true);
 654         write_unlock(&et->lock);
 655
 656         return node_cnt;
 657 }
 658
 659 void f2fs_destroy_extent_tree(struct inode *inode)
 660 {
 661         struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
 662         struct extent_tree *et = F2FS_I(inode)->extent_tree;
 663         unsigned int node_cnt = 0;
 664
 665         if (!et)
 666                 return;
 667
 668         if (inode->i_nlink && !is_bad_inode(inode) &&
 669                                         atomic_read(&et->node_cnt)) {
 670                 down_write(&sbi->extent_tree_lock);
 671                 list_add_tail(&et->list, &sbi->zombie_list);
 672                 atomic_inc(&sbi->total_zombie_tree);
 673                 up_write(&sbi->extent_tree_lock);
 674                 return;
 675         }
 676
 677         /* free all extent info belong to this extent tree */
 678         node_cnt = f2fs_destroy_extent_node(inode);
 679
 680         /* delete extent tree entry in radix tree */
 681         down_write(&sbi->extent_tree_lock);
 682         f2fs_bug_on(sbi, atomic_read(&et->node_cnt));
 683         radix_tree_delete(&sbi->extent_tree_root, inode->i_ino);
 684         kmem_cache_free(extent_tree_slab, et);
 685         atomic_dec(&sbi->total_ext_tree);
 686         up_write(&sbi->extent_tree_lock);
 687
 688         F2FS_I(inode)->extent_tree = NULL;
 689
 690         trace_f2fs_destroy_extent_tree(inode, node_cnt);
 691 }
 692
 693 bool f2fs_lookup_extent_cache(struct inode *inode, pgoff_t pgofs,
 694                                         struct extent_info *ei)
 695 {
 696         if (!f2fs_may_extent_tree(inode))
 697                 return false;
 698
 699         return f2fs_lookup_extent_tree(inode, pgofs, ei);
 700 }
 701
 702 void f2fs_update_extent_cache(struct dnode_of_data *dn)
 703 {
 704         struct f2fs_inode_info *fi = F2FS_I(dn->inode);
 705         pgoff_t fofs;
 706
 707         if (!f2fs_may_extent_tree(dn->inode))
 708                 return;
 709
 710         f2fs_bug_on(F2FS_I_SB(dn->inode), dn->data_blkaddr == NEW_ADDR);
 711
 712
 713         fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
 714                                                         dn->ofs_in_node;
 715
 716         if (f2fs_update_extent_tree_range(dn->inode, fofs, dn->data_blkaddr, 1))
 717                 sync_inode_page(dn);
 718 }
 719
 720 void f2fs_update_extent_cache_range(struct dnode_of_data *dn,
 721                                 pgoff_t fofs, block_t blkaddr, unsigned int len)
 722
 723 {
 724         if (!f2fs_may_extent_tree(dn->inode))
 725                 return;
 726
 727         if (f2fs_update_extent_tree_range(dn->inode, fofs, blkaddr, len))
 728                 sync_inode_page(dn);
 729 }
 730
 731 void init_extent_cache_info(struct f2fs_sb_info *sbi)
 732 {
 733         INIT_RADIX_TREE(&sbi->extent_tree_root, GFP_NOIO);
 734         init_rwsem(&sbi->extent_tree_lock);
 735         INIT_LIST_HEAD(&sbi->extent_list);
 736         spin_lock_init(&sbi->extent_lock);
 737         atomic_set(&sbi->total_ext_tree, 0);
 738         INIT_LIST_HEAD(&sbi->zombie_list);
 739         atomic_set(&sbi->total_zombie_tree, 0);
 740         atomic_set(&sbi->total_ext_node, 0);
 741 }
 742
 743 int __init create_extent_cache(void)
 744 {
 745         extent_tree_slab = f2fs_kmem_cache_create("f2fs_extent_tree",
 746                         sizeof(struct extent_tree));
 747         if (!extent_tree_slab)
 748                 return -ENOMEM;
 749         extent_node_slab = f2fs_kmem_cache_create("f2fs_extent_node",
 750                         sizeof(struct extent_node));
 751         if (!extent_node_slab) {
 752                 kmem_cache_destroy(extent_tree_slab);
 753                 return -ENOMEM;
 754         }
 755         return 0;
 756 }
 757
 758 void destroy_extent_cache(void)
 759 {
 760         kmem_cache_destroy(extent_node_slab);
 761         kmem_cache_destroy(extent_tree_slab);
 762 }