disk-io.c

   1 /*
   2  * Copyright (C) 2007 Oracle.  All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public
   6  * License v2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public
  14  * License along with this program; if not, write to the
  15  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  16  * Boston, MA 021110-1307, USA.
  17  */
  18
  19 #define _XOPEN_SOURCE 600
  20 #define __USE_XOPEN2K
  21 #define _GNU_SOURCE 1
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <unistd.h>
  28 #include "kerncompat.h"
  29 #include "radix-tree.h"
  30 #include "ctree.h"
  31 #include "disk-io.h"
  32 #include "volumes.h"
  33 #include "transaction.h"
  34 #include "crc32c.h"
  35 #include "utils.h"
  36 #include "print-tree.h"
  37
  38 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
  39 {
  40
  41         struct btrfs_fs_devices *fs_devices;
  42         int ret = 1;
  43
  44         if (buf->start != btrfs_header_bytenr(buf))
  45                 return ret;
  46
  47         fs_devices = root->fs_info->fs_devices;
  48         while (fs_devices) {
  49                 if (!memcmp_extent_buffer(buf, fs_devices->fsid,
  50                                           (unsigned long)btrfs_header_fsid(buf),
  51                                           BTRFS_FSID_SIZE)) {
  52                         ret = 0;
  53                         break;
  54                 }
  55                 fs_devices = fs_devices->seed;
  56         }
  57         return ret;
  58 }
  59
  60 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
  61 {
  62         return crc32c(seed, data, len);
  63 }
  64
  65 void btrfs_csum_final(u32 crc, char *result)
  66 {
  67         *(__le32 *)result = ~cpu_to_le32(crc);
  68 }
  69
  70 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
  71                          int verify)
  72 {
  73         char *result;
  74         u32 len;
  75         u32 crc = ~(u32)0;
  76
  77         result = malloc(csum_size * sizeof(char));
  78         if (!result)
  79                 return 1;
  80
  81         len = buf->len - BTRFS_CSUM_SIZE;
  82         crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
  83         btrfs_csum_final(crc, result);
  84
  85         if (verify) {
  86                 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
  87                         printk("checksum verify failed on %llu wanted %X "
  88                                "found %X\n", (unsigned long long)buf->start,
  89                                *((int *)result), *((char *)buf->data));
  90                         free(result);
  91                         return 1;
  92                 }
  93         } else {
  94                 write_extent_buffer(buf, result, 0, csum_size);
  95         }
  96         free(result);
  97         return 0;
  98 }
  99
 100 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
 101                     int verify)
 102 {
 103         u16 csum_size =
 104                 btrfs_super_csum_size(&root->fs_info->super_copy);
 105         return csum_tree_block_size(buf, csum_size, verify);
 106 }
 107
 108 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
 109                                             u64 bytenr, u32 blocksize)
 110 {
 111         return find_extent_buffer(&root->fs_info->extent_cache,
 112                                   bytenr, blocksize);
 113 }
 114
 115 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
 116                                                  u64 bytenr, u32 blocksize)
 117 {
 118         return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
 119                                    blocksize);
 120 }
 121
 122 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
 123                          u64 parent_transid)
 124 {
 125         int ret;
 126         struct extent_buffer *eb;
 127         u64 length;
 128         struct btrfs_multi_bio *multi = NULL;
 129         struct btrfs_device *device;
 130
 131         eb = btrfs_find_tree_block(root, bytenr, blocksize);
 132         if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
 133                 free_extent_buffer(eb);
 134                 return 0;
 135         }
 136
 137         length = blocksize;
 138         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 139                               bytenr, &length, &multi, 0);
 140         BUG_ON(ret);
 141         device = multi->stripes[0].dev;
 142         device->total_ios++;
 143         blocksize = min(blocksize, (u32)(64 * 1024));
 144         readahead(device->fd, multi->stripes[0].physical, blocksize);
 145         kfree(multi);
 146         return 0;
 147 }
 148
 149 static int verify_parent_transid(struct extent_io_tree *io_tree,
 150                                  struct extent_buffer *eb, u64 parent_transid)
 151 {
 152         int ret;
 153
 154         if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
 155                 return 0;
 156
 157         if (extent_buffer_uptodate(eb) &&
 158             btrfs_header_generation(eb) == parent_transid) {
 159                 ret = 0;
 160                 goto out;
 161         }
 162         printk("parent transid verify failed on %llu wanted %llu found %llu\n",
 163                (unsigned long long)eb->start,
 164                (unsigned long long)parent_transid,
 165                (unsigned long long)btrfs_header_generation(eb));
 166         ret = 1;
 167 out:
 168         clear_extent_buffer_uptodate(io_tree, eb);
 169         return ret;
 170
 171 }
 172
 173
 174 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
 175                                      u32 blocksize, u64 parent_transid)
 176 {
 177         int ret;
 178         struct extent_buffer *eb;
 179         u64 length;
 180         struct btrfs_multi_bio *multi = NULL;
 181         struct btrfs_device *device;
 182         int mirror_num = 0;
 183         int num_copies;
 184
 185         eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
 186         if (!eb)
 187                 return NULL;
 188
 189         if (btrfs_buffer_uptodate(eb, parent_transid))
 190                 return eb;
 191
 192         length = blocksize;
 193         while (1) {
 194                 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 195                                       eb->start, &length, &multi, mirror_num);
 196                 BUG_ON(ret);
 197                 device = multi->stripes[0].dev;
 198                 eb->fd = device->fd;
 199                 device->total_ios++;
 200                 eb->dev_bytenr = multi->stripes[0].physical;
 201                 kfree(multi);
 202                 ret = read_extent_from_disk(eb);
 203
 204                 if (ret == 0 && check_tree_block(root, eb) == 0 &&
 205                     csum_tree_block(root, eb, 1) == 0 &&
 206                     verify_parent_transid(eb->tree, eb, parent_transid) == 0) {
 207                         btrfs_set_buffer_uptodate(eb);
 208                         return eb;
 209                 }
 210                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 211                                               eb->start, eb->len);
 212                 if (num_copies == 1) {
 213                         break;
 214                 }
 215                 mirror_num++;
 216                 if (mirror_num > num_copies) {
 217                         break;
 218                 }
 219         }
 220         free_extent_buffer(eb);
 221         return NULL;
 222 }
 223
 224 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 225                      struct extent_buffer *eb)
 226 {
 227         int ret;
 228         int dev_nr;
 229         u64 length;
 230         struct btrfs_multi_bio *multi = NULL;
 231
 232         if (check_tree_block(root, eb))
 233                 BUG();
 234         if (!btrfs_buffer_uptodate(eb, trans->transid))
 235                 BUG();
 236
 237         btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
 238         csum_tree_block(root, eb, 0);
 239
 240         dev_nr = 0;
 241         length = eb->len;
 242         ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
 243                               eb->start, &length, &multi, 0);
 244
 245         while(dev_nr < multi->num_stripes) {
 246                 BUG_ON(ret);
 247                 eb->fd = multi->stripes[dev_nr].dev->fd;
 248                 eb->dev_bytenr = multi->stripes[dev_nr].physical;
 249                 multi->stripes[dev_nr].dev->total_ios++;
 250                 dev_nr++;
 251                 ret = write_extent_to_disk(eb);
 252                 BUG_ON(ret);
 253         }
 254         kfree(multi);
 255         return 0;
 256 }
 257
 258 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
 259                         u32 stripesize, struct btrfs_root *root,
 260                         struct btrfs_fs_info *fs_info, u64 objectid)
 261 {
 262         root->node = NULL;
 263         root->commit_root = NULL;
 264         root->sectorsize = sectorsize;
 265         root->nodesize = nodesize;
 266         root->leafsize = leafsize;
 267         root->stripesize = stripesize;
 268         root->ref_cows = 0;
 269         root->track_dirty = 0;
 270
 271         root->fs_info = fs_info;
 272         root->objectid = objectid;
 273         root->last_trans = 0;
 274         root->highest_inode = 0;
 275         root->last_inode_alloc = 0;
 276
 277         INIT_LIST_HEAD(&root->dirty_list);
 278         memset(&root->root_key, 0, sizeof(root->root_key));
 279         memset(&root->root_item, 0, sizeof(root->root_item));
 280         root->root_key.objectid = objectid;
 281         return 0;
 282 }
 283
 284 static int update_cowonly_root(struct btrfs_trans_handle *trans,
 285                                struct btrfs_root *root)
 286 {
 287         int ret;
 288         u64 old_root_bytenr;
 289         struct btrfs_root *tree_root = root->fs_info->tree_root;
 290
 291         btrfs_write_dirty_block_groups(trans, root);
 292         while(1) {
 293                 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
 294                 if (old_root_bytenr == root->node->start)
 295                         break;
 296                 btrfs_set_root_bytenr(&root->root_item,
 297                                        root->node->start);
 298                 btrfs_set_root_generation(&root->root_item,
 299                                           trans->transid);
 300                 root->root_item.level = btrfs_header_level(root->node);
 301                 ret = btrfs_update_root(trans, tree_root,
 302                                         &root->root_key,
 303                                         &root->root_item);
 304                 BUG_ON(ret);
 305                 btrfs_write_dirty_block_groups(trans, root);
 306         }
 307         return 0;
 308 }
 309
 310 static int commit_tree_roots(struct btrfs_trans_handle *trans,
 311                              struct btrfs_fs_info *fs_info)
 312 {
 313         struct btrfs_root *root;
 314         struct list_head *next;
 315         struct extent_buffer *eb;
 316
 317         if (fs_info->readonly)
 318                 return 0;
 319
 320         eb = fs_info->tree_root->node;
 321         extent_buffer_get(eb);
 322         btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
 323         free_extent_buffer(eb);
 324
 325         while(!list_empty(&fs_info->dirty_cowonly_roots)) {
 326                 next = fs_info->dirty_cowonly_roots.next;
 327                 list_del_init(next);
 328                 root = list_entry(next, struct btrfs_root, dirty_list);
 329                 update_cowonly_root(trans, root);
 330         }
 331         return 0;
 332 }
 333
 334 static int __commit_transaction(struct btrfs_trans_handle *trans,
 335                                 struct btrfs_root *root)
 336 {
 337         u64 start;
 338         u64 end;
 339         struct extent_buffer *eb;
 340         struct extent_io_tree *tree = &root->fs_info->extent_cache;
 341         int ret;
 342
 343         while(1) {
 344                 ret = find_first_extent_bit(tree, 0, &start, &end,
 345                                             EXTENT_DIRTY);
 346                 if (ret)
 347                         break;
 348                 while(start <= end) {
 349                         eb = find_first_extent_buffer(tree, start);
 350                         BUG_ON(!eb || eb->start != start);
 351                         ret = write_tree_block(trans, root, eb);
 352                         BUG_ON(ret);
 353                         start += eb->len;
 354                         clear_extent_buffer_dirty(eb);
 355                         free_extent_buffer(eb);
 356                 }
 357         }
 358         return 0;
 359 }
 360
 361 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
 362                              struct btrfs_root *root)
 363 {
 364         int ret = 0;
 365         struct btrfs_fs_info *fs_info = root->fs_info;
 366
 367         if (root->commit_root == root->node)
 368                 goto commit_tree;
 369
 370         free_extent_buffer(root->commit_root);
 371         root->commit_root = NULL;
 372
 373         btrfs_set_root_bytenr(&root->root_item, root->node->start);
 374         btrfs_set_root_generation(&root->root_item, trans->transid);
 375         root->root_item.level = btrfs_header_level(root->node);
 376         ret = btrfs_update_root(trans, root->fs_info->tree_root,
 377                                 &root->root_key, &root->root_item);
 378         BUG_ON(ret);
 379 commit_tree:
 380         ret = commit_tree_roots(trans, fs_info);
 381         BUG_ON(ret);
 382         ret = __commit_transaction(trans, root);
 383         BUG_ON(ret);
 384         write_ctree_super(trans, root);
 385         btrfs_finish_extent_commit(trans, fs_info->extent_root,
 386                                    &fs_info->pinned_extents);
 387         btrfs_free_transaction(root, trans);
 388         free_extent_buffer(root->commit_root);
 389         root->commit_root = NULL;
 390         fs_info->running_transaction = NULL;
 391         return 0;
 392 }
 393
 394 static int find_and_setup_root(struct btrfs_root *tree_root,
 395                                struct btrfs_fs_info *fs_info,
 396                                u64 objectid, struct btrfs_root *root)
 397 {
 398         int ret;
 399         u32 blocksize;
 400         u64 generation;
 401
 402         __setup_root(tree_root->nodesize, tree_root->leafsize,
 403                      tree_root->sectorsize, tree_root->stripesize,
 404                      root, fs_info, objectid);
 405         ret = btrfs_find_last_root(tree_root, objectid,
 406                                    &root->root_item, &root->root_key);
 407         BUG_ON(ret);
 408
 409         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 410         generation = btrfs_root_generation(&root->root_item);
 411         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 412                                      blocksize, generation);
 413         BUG_ON(!root->node);
 414         return 0;
 415 }
 416
 417 static int find_and_setup_log_root(struct btrfs_root *tree_root,
 418                                struct btrfs_fs_info *fs_info,
 419                                struct btrfs_super_block *disk_super)
 420 {
 421         u32 blocksize;
 422         u64 blocknr = btrfs_super_log_root(disk_super);
 423         struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
 424
 425         if (blocknr == 0)
 426                 return 0;
 427
 428         blocksize = btrfs_level_size(tree_root,
 429                              btrfs_super_log_root_level(disk_super));
 430
 431         __setup_root(tree_root->nodesize, tree_root->leafsize,
 432                      tree_root->sectorsize, tree_root->stripesize,
 433                      log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
 434
 435         log_root->node = read_tree_block(tree_root, blocknr,
 436                                      blocksize,
 437                                      btrfs_super_generation(disk_super) + 1);
 438
 439         fs_info->log_root_tree = log_root;
 440         BUG_ON(!log_root->node);
 441         return 0;
 442 }
 443
 444
 445 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info,
 446                        struct btrfs_root *root)
 447 {
 448         if (root->node)
 449                 free_extent_buffer(root->node);
 450         if (root->commit_root)
 451                 free_extent_buffer(root->commit_root);
 452         kfree(root);
 453         return 0;
 454 }
 455
 456 static int free_fs_roots(struct btrfs_fs_info *fs_info)
 457 {
 458         struct cache_extent *cache;
 459         struct btrfs_root *root;
 460
 461         while (1) {
 462                 cache = find_first_cache_extent(&fs_info->fs_root_cache, 0);
 463                 if (!cache)
 464                         break;
 465                 root = container_of(cache, struct btrfs_root, cache);
 466                 remove_cache_extent(&fs_info->fs_root_cache, cache);
 467                 btrfs_free_fs_root(fs_info, root);
 468         }
 469         return 0;
 470 }
 471
 472 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
 473                                                struct btrfs_key *location)
 474 {
 475         struct btrfs_root *root;
 476         struct btrfs_root *tree_root = fs_info->tree_root;
 477         struct btrfs_path *path;
 478         struct extent_buffer *l;
 479         u64 generation;
 480         u32 blocksize;
 481         int ret = 0;
 482
 483         root = malloc(sizeof(*root));
 484         if (!root)
 485                 return ERR_PTR(-ENOMEM);
 486         memset(root, 0, sizeof(*root));
 487         if (location->offset == (u64)-1) {
 488                 ret = find_and_setup_root(tree_root, fs_info,
 489                                           location->objectid, root);
 490                 if (ret) {
 491                         free(root);
 492                         return ERR_PTR(ret);
 493                 }
 494                 goto insert;
 495         }
 496
 497         __setup_root(tree_root->nodesize, tree_root->leafsize,
 498                      tree_root->sectorsize, tree_root->stripesize,
 499                      root, fs_info, location->objectid);
 500
 501         path = btrfs_alloc_path();
 502         BUG_ON(!path);
 503         ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
 504         if (ret != 0) {
 505                 if (ret > 0)
 506                         ret = -ENOENT;
 507                 goto out;
 508         }
 509         l = path->nodes[0];
 510         read_extent_buffer(l, &root->root_item,
 511                btrfs_item_ptr_offset(l, path->slots[0]),
 512                sizeof(root->root_item));
 513         memcpy(&root->root_key, location, sizeof(*location));
 514         ret = 0;
 515 out:
 516         btrfs_release_path(root, path);
 517         btrfs_free_path(path);
 518         if (ret) {
 519                 free(root);
 520                 return ERR_PTR(ret);
 521         }
 522         generation = btrfs_root_generation(&root->root_item);
 523         blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
 524         root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
 525                                      blocksize, generation);
 526         BUG_ON(!root->node);
 527 insert:
 528         root->ref_cows = 1;
 529         return root;
 530 }
 531
 532 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
 533                                       struct btrfs_key *location)
 534 {
 535         struct btrfs_root *root;
 536         struct cache_extent *cache;
 537         int ret;
 538
 539         if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
 540                 return fs_info->tree_root;
 541         if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
 542                 return fs_info->extent_root;
 543         if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
 544                 return fs_info->chunk_root;
 545         if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
 546                 return fs_info->dev_root;
 547         if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
 548                 return fs_info->csum_root;
 549
 550         BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
 551                location->offset != (u64)-1);
 552
 553         cache = find_cache_extent(&fs_info->fs_root_cache,
 554                                   location->objectid, 1);
 555         if (cache)
 556                 return container_of(cache, struct btrfs_root, cache);
 557
 558         root = btrfs_read_fs_root_no_cache(fs_info, location);
 559         if (IS_ERR(root))
 560                 return root;
 561
 562         root->cache.start = location->objectid;
 563         root->cache.size = 1;
 564         ret = insert_existing_cache_extent(&fs_info->fs_root_cache,
 565                                            &root->cache);
 566         BUG_ON(ret);
 567         return root;
 568 }
 569
 570 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
 571 {
 572         int fp;
 573         struct btrfs_root *root;
 574         int flags = O_CREAT | O_RDWR;
 575
 576         if (!writes)
 577                 flags = O_RDONLY;
 578
 579         fp = open(filename, flags, 0600);
 580         if (fp < 0) {
 581                 fprintf (stderr, "Could not open %s\n", filename);
 582                 return NULL;
 583         }
 584         root = open_ctree_fd(fp, filename, sb_bytenr, writes);
 585         close(fp);
 586
 587         return root;
 588 }
 589
 590 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
 591                                  int writes)
 592 {
 593         u32 sectorsize;
 594         u32 nodesize;
 595         u32 leafsize;
 596         u32 blocksize;
 597         u32 stripesize;
 598         u64 generation;
 599         struct btrfs_key key;
 600         struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
 601         struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
 602         struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
 603         struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
 604         struct btrfs_root *csum_root = malloc(sizeof(struct btrfs_root));
 605         struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
 606         int ret;
 607         struct btrfs_super_block *disk_super;
 608         struct btrfs_fs_devices *fs_devices = NULL;
 609         u64 total_devs;
 610         u64 features;
 611
 612         if (sb_bytenr == 0)
 613                 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
 614
 615         ret = btrfs_scan_one_device(fp, path, &fs_devices,
 616                                     &total_devs, sb_bytenr);
 617
 618         if (ret) {
 619                 fprintf(stderr, "No valid Btrfs found on %s\n", path);
 620                 return NULL;
 621         }
 622
 623         if (total_devs != 1) {
 624                 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
 625                 BUG_ON(ret);
 626         }
 627
 628         memset(fs_info, 0, sizeof(*fs_info));
 629         fs_info->tree_root = tree_root;
 630         fs_info->extent_root = extent_root;
 631         fs_info->chunk_root = chunk_root;
 632         fs_info->dev_root = dev_root;
 633         fs_info->csum_root = csum_root;
 634
 635         if (!writes)
 636                 fs_info->readonly = 1;
 637
 638         extent_io_tree_init(&fs_info->extent_cache);
 639         extent_io_tree_init(&fs_info->free_space_cache);
 640         extent_io_tree_init(&fs_info->block_group_cache);
 641         extent_io_tree_init(&fs_info->pinned_extents);
 642         extent_io_tree_init(&fs_info->pending_del);
 643         extent_io_tree_init(&fs_info->extent_ins);
 644         cache_tree_init(&fs_info->fs_root_cache);
 645
 646         cache_tree_init(&fs_info->mapping_tree.cache_tree);
 647
 648         mutex_init(&fs_info->fs_mutex);
 649         fs_info->fs_devices = fs_devices;
 650         INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
 651         INIT_LIST_HEAD(&fs_info->space_info);
 652
 653         __setup_root(4096, 4096, 4096, 4096, tree_root,
 654                      fs_info, BTRFS_ROOT_TREE_OBJECTID);
 655
 656         if (writes)
 657                 ret = btrfs_open_devices(fs_devices, O_RDWR);
 658         else
 659                 ret = btrfs_open_devices(fs_devices, O_RDONLY);
 660         BUG_ON(ret);
 661
 662         fs_info->super_bytenr = sb_bytenr;
 663         disk_super = &fs_info->super_copy;
 664         ret = btrfs_read_dev_super(fs_devices->latest_bdev,
 665                                    disk_super, sb_bytenr);
 666         if (ret) {
 667                 printk("No valid btrfs found\n");
 668                 BUG_ON(1);
 669         }
 670
 671         memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
 672
 673
 674         features = btrfs_super_incompat_flags(disk_super) &
 675                    ~BTRFS_FEATURE_INCOMPAT_SUPP;
 676         if (features) {
 677                 printk("couldn't open because of unsupported "
 678                        "option features (%Lx).\n",
 679                        (unsigned long long)features);
 680                 BUG_ON(1);
 681         }
 682
 683         features = btrfs_super_incompat_flags(disk_super);
 684         if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
 685                 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
 686                 btrfs_set_super_incompat_flags(disk_super, features);
 687         }
 688
 689         features = btrfs_super_compat_ro_flags(disk_super) &
 690                 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
 691         if (writes && features) {
 692                 printk("couldn't open RDWR because of unsupported "
 693                        "option features (%Lx).\n",
 694                        (unsigned long long)features);
 695                 BUG_ON(1);
 696         }
 697
 698         nodesize = btrfs_super_nodesize(disk_super);
 699         leafsize = btrfs_super_leafsize(disk_super);
 700         sectorsize = btrfs_super_sectorsize(disk_super);
 701         stripesize = btrfs_super_stripesize(disk_super);
 702         tree_root->nodesize = nodesize;
 703         tree_root->leafsize = leafsize;
 704         tree_root->sectorsize = sectorsize;
 705         tree_root->stripesize = stripesize;
 706
 707         ret = btrfs_read_sys_array(tree_root);
 708         BUG_ON(ret);
 709         blocksize = btrfs_level_size(tree_root,
 710                                      btrfs_super_chunk_root_level(disk_super));
 711         generation = btrfs_super_chunk_root_generation(disk_super);
 712
 713         __setup_root(nodesize, leafsize, sectorsize, stripesize,
 714                      chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
 715
 716         chunk_root->node = read_tree_block(chunk_root,
 717                                            btrfs_super_chunk_root(disk_super),
 718                                            blocksize, generation);
 719
 720         BUG_ON(!chunk_root->node);
 721
 722         read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
 723                  (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
 724                  BTRFS_UUID_SIZE);
 725
 726         if (!(btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)) {
 727                 ret = btrfs_read_chunk_tree(chunk_root);
 728                 BUG_ON(ret);
 729         }
 730
 731         blocksize = btrfs_level_size(tree_root,
 732                                      btrfs_super_root_level(disk_super));
 733         generation = btrfs_super_generation(disk_super);
 734
 735         tree_root->node = read_tree_block(tree_root,
 736                                           btrfs_super_root(disk_super),
 737                                           blocksize, generation);
 738         BUG_ON(!tree_root->node);
 739         ret = find_and_setup_root(tree_root, fs_info,
 740                                   BTRFS_EXTENT_TREE_OBJECTID, extent_root);
 741         BUG_ON(ret);
 742         extent_root->track_dirty = 1;
 743
 744         ret = find_and_setup_root(tree_root, fs_info,
 745                                   BTRFS_DEV_TREE_OBJECTID, dev_root);
 746         BUG_ON(ret);
 747         dev_root->track_dirty = 1;
 748
 749         ret = find_and_setup_root(tree_root, fs_info,
 750                                   BTRFS_CSUM_TREE_OBJECTID, csum_root);
 751         BUG_ON(ret);
 752         csum_root->track_dirty = 1;
 753
 754         BUG_ON(ret);
 755
 756         find_and_setup_log_root(tree_root, fs_info, disk_super);
 757
 758         fs_info->generation = generation + 1;
 759         btrfs_read_block_groups(fs_info->tree_root);
 760
 761         key.objectid = BTRFS_FS_TREE_OBJECTID;
 762         key.type = BTRFS_ROOT_ITEM_KEY;
 763         key.offset = (u64)-1;
 764         fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
 765
 766         fs_info->data_alloc_profile = (u64)-1;
 767         fs_info->metadata_alloc_profile = (u64)-1;
 768         fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
 769
 770         return fs_info->fs_root;
 771 }
 772
 773 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
 774 {
 775         u8 fsid[BTRFS_FSID_SIZE];
 776         struct btrfs_super_block buf;
 777         int i;
 778         int ret;
 779         u64 transid = 0;
 780         u64 bytenr;
 781
 782         if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
 783                 ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
 784                 if (ret < sizeof(buf))
 785                         return -1;
 786
 787                 if (btrfs_super_bytenr(&buf) != sb_bytenr ||
 788                     strncmp((char *)(&buf.magic), BTRFS_MAGIC,
 789                             sizeof(buf.magic)))
 790                         return -1;
 791
 792                 memcpy(sb, &buf, sizeof(*sb));
 793                 return 0;
 794         }
 795
 796         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
 797                 bytenr = btrfs_sb_offset(i);
 798                 ret = pread64(fd, &buf, sizeof(buf), bytenr);
 799                 if (ret < sizeof(buf))
 800                         break;
 801
 802                 if (btrfs_super_bytenr(&buf) != bytenr ||
 803                     strncmp((char *)(&buf.magic), BTRFS_MAGIC,
 804                             sizeof(buf.magic)))
 805                         continue;
 806
 807                 if (i == 0)
 808                         memcpy(fsid, buf.fsid, sizeof(fsid));
 809                 else if (memcmp(fsid, buf.fsid, sizeof(fsid)))
 810                         continue;
 811
 812                 if (btrfs_super_generation(&buf) > transid) {
 813                         memcpy(sb, &buf, sizeof(*sb));
 814                         transid = btrfs_super_generation(&buf);
 815                 }
 816         }
 817
 818         return transid > 0 ? 0 : -1;
 819 }
 820
 821 int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
 822                      struct btrfs_device *device)
 823 {
 824         u64 bytenr;
 825         u32 crc;
 826         int i, ret;
 827
 828         if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
 829                 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
 830 printk("speiiiiiiiiiiiiiiiiiiiiiiiiiiiii\n");
 831                 crc = ~(u32)0;
 832                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
 833                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
 834                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
 835
 836                 ret = pwrite64(device->fd, sb, BTRFS_SUPER_INFO_SIZE,
 837                                root->fs_info->super_bytenr);
 838                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
 839                 return 0;
 840         }
 841
 842         for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
 843                 bytenr = btrfs_sb_offset(i);
 844                 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
 845                         break;
 846
 847                 btrfs_set_super_bytenr(sb, bytenr);
 848
 849                 crc = ~(u32)0;
 850                 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
 851                                       BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
 852                 btrfs_csum_final(crc, (char *)&sb->csum[0]);
 853
 854                 ret = pwrite64(device->fd, sb, BTRFS_SUPER_INFO_SIZE, bytenr);
 855                 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
 856         }
 857         return 0;
 858 }
 859
 860 int write_all_supers(struct btrfs_root *root)
 861 {
 862         struct list_head *cur;
 863         struct list_head *head = &root->fs_info->fs_devices->devices;
 864         struct btrfs_device *dev;
 865         struct btrfs_super_block *sb;
 866         struct btrfs_dev_item *dev_item;
 867         int ret;
 868         u64 flags;
 869
 870         sb = &root->fs_info->super_copy;
 871         dev_item = &sb->dev_item;
 872         list_for_each(cur, head) {
 873                 dev = list_entry(cur, struct btrfs_device, dev_list);
 874                 if (!dev->writeable)
 875                         continue;
 876
 877                 btrfs_set_stack_device_generation(dev_item, 0);
 878                 btrfs_set_stack_device_type(dev_item, dev->type);
 879                 btrfs_set_stack_device_id(dev_item, dev->devid);
 880                 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
 881                 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
 882                 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
 883                 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
 884                 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
 885                 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
 886                 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
 887
 888                 flags = btrfs_super_flags(sb);
 889                 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
 890
 891                 ret = write_dev_supers(root, sb, dev);
 892                 BUG_ON(ret);
 893         }
 894         return 0;
 895 }
 896
 897 int write_ctree_super(struct btrfs_trans_handle *trans,
 898                       struct btrfs_root *root)
 899 {
 900         int ret;
 901         struct btrfs_root *tree_root = root->fs_info->tree_root;
 902         struct btrfs_root *chunk_root = root->fs_info->chunk_root;
 903
 904         if (root->fs_info->readonly)
 905                 return 0;
 906
 907         btrfs_set_super_generation(&root->fs_info->super_copy,
 908                                    trans->transid);
 909         btrfs_set_super_root(&root->fs_info->super_copy,
 910                              tree_root->node->start);
 911         btrfs_set_super_root_level(&root->fs_info->super_copy,
 912                                    btrfs_header_level(tree_root->node));
 913         btrfs_set_super_chunk_root(&root->fs_info->super_copy,
 914                                    chunk_root->node->start);
 915         btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
 916                                          btrfs_header_level(chunk_root->node));
 917         btrfs_set_super_chunk_root_generation(&root->fs_info->super_copy,
 918                                 btrfs_header_generation(chunk_root->node));
 919
 920         ret = write_all_supers(root);
 921         if (ret)
 922                 fprintf(stderr, "failed to write new super block err %d\n", ret);
 923         return ret;
 924 }
 925
 926 static int close_all_devices(struct btrfs_fs_info *fs_info)
 927 {
 928         struct list_head *list;
 929         struct list_head *next;
 930         struct btrfs_device *device;
 931
 932         return 0;
 933
 934         list = &fs_info->fs_devices->devices;
 935         list_for_each(next, list) {
 936                 device = list_entry(next, struct btrfs_device, dev_list);
 937                 close(device->fd);
 938         }
 939         return 0;
 940 }
 941
 942 int close_ctree(struct btrfs_root *root)
 943 {
 944         int ret;
 945         struct btrfs_trans_handle *trans;
 946         struct btrfs_fs_info *fs_info = root->fs_info;
 947
 948         trans = btrfs_start_transaction(root, 1);
 949         btrfs_commit_transaction(trans, root);
 950         trans = btrfs_start_transaction(root, 1);
 951         ret = commit_tree_roots(trans, fs_info);
 952         BUG_ON(ret);
 953         ret = __commit_transaction(trans, root);
 954         BUG_ON(ret);
 955         write_ctree_super(trans, root);
 956         btrfs_free_transaction(root, trans);
 957         btrfs_free_block_groups(fs_info);
 958
 959         free_fs_roots(fs_info);
 960
 961         if (fs_info->extent_root->node)
 962                 free_extent_buffer(fs_info->extent_root->node);
 963         if (fs_info->tree_root->node)
 964                 free_extent_buffer(fs_info->tree_root->node);
 965         if (fs_info->chunk_root->node)
 966                 free_extent_buffer(fs_info->chunk_root->node);
 967         if (fs_info->dev_root->node)
 968                 free_extent_buffer(fs_info->dev_root->node);
 969         if (fs_info->csum_root->node)
 970                 free_extent_buffer(fs_info->csum_root->node);
 971
 972         if (fs_info->log_root_tree) {
 973                 if (fs_info->log_root_tree->node)
 974                         free_extent_buffer(fs_info->log_root_tree->node);
 975                 free(fs_info->log_root_tree);
 976         }
 977
 978         close_all_devices(fs_info);
 979         extent_io_tree_cleanup(&fs_info->extent_cache);
 980         extent_io_tree_cleanup(&fs_info->free_space_cache);
 981         extent_io_tree_cleanup(&fs_info->block_group_cache);
 982         extent_io_tree_cleanup(&fs_info->pinned_extents);
 983         extent_io_tree_cleanup(&fs_info->pending_del);
 984         extent_io_tree_cleanup(&fs_info->extent_ins);
 985
 986         free(fs_info->tree_root);
 987         free(fs_info->extent_root);
 988         free(fs_info->chunk_root);
 989         free(fs_info->dev_root);
 990         free(fs_info->csum_root);
 991         free(fs_info);
 992
 993         return 0;
 994 }
 995
 996 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 997                      struct extent_buffer *eb)
 998 {
 999         return clear_extent_buffer_dirty(eb);
1000 }
1001
1002 int wait_on_tree_block_writeback(struct btrfs_root *root,
1003                                  struct extent_buffer *eb)
1004 {
1005         return 0;
1006 }
1007
1008 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1009 {
1010         set_extent_buffer_dirty(eb);
1011 }
1012
1013 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1014 {
1015         int ret;
1016
1017         ret = extent_buffer_uptodate(buf);
1018         if (!ret)
1019                 return ret;
1020
1021         ret = verify_parent_transid(buf->tree, buf, parent_transid);
1022         return !ret;
1023 }
1024
1025 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1026 {
1027         return set_extent_buffer_uptodate(eb);
1028 }