cmds-restore.c

   1 /*
   2  * Copyright (C) 2011 Red Hat.  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
  20 #include "kerncompat.h"
  21
  22 #include <ctype.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <fcntl.h>
  27 #include <sys/stat.h>
  28 #include <sys/types.h>
  29 #include <lzo/lzoconf.h>
  30 #include <lzo/lzo1x.h>
  31 #include <zlib.h>
  32 #include <regex.h>
  33 #include <getopt.h>
  34 #include <sys/types.h>
  35 #include <sys/xattr.h>
  36
  37 #include "ctree.h"
  38 #include "disk-io.h"
  39 #include "print-tree.h"
  40 #include "transaction.h"
  41 #include "list.h"
  42 #include "volumes.h"
  43 #include "utils.h"
  44 #include "commands.h"
  45
  46 static char fs_name[PATH_MAX];
  47 static char path_name[PATH_MAX];
  48 static int get_snaps = 0;
  49 static int verbose = 0;
  50 static int restore_metadata = 0;
  51 static int ignore_errors = 0;
  52 static int overwrite = 0;
  53 static int get_xattrs = 0;
  54 static int dry_run = 0;
  55
  56 #define LZO_LEN 4
  57 #define PAGE_CACHE_SIZE 4096
  58 #define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3)
  59
  60 static int decompress_zlib(char *inbuf, char *outbuf, u64 compress_len,
  61                            u64 decompress_len)
  62 {
  63         z_stream strm;
  64         int ret;
  65
  66         memset(&strm, 0, sizeof(strm));
  67         ret = inflateInit(&strm);
  68         if (ret != Z_OK) {
  69                 fprintf(stderr, "inflate init returnd %d\n", ret);
  70                 return -1;
  71         }
  72
  73         strm.avail_in = compress_len;
  74         strm.next_in = (unsigned char *)inbuf;
  75         strm.avail_out = decompress_len;
  76         strm.next_out = (unsigned char *)outbuf;
  77         ret = inflate(&strm, Z_NO_FLUSH);
  78         if (ret != Z_STREAM_END) {
  79                 (void)inflateEnd(&strm);
  80                 fprintf(stderr, "failed to inflate: %d\n", ret);
  81                 return -1;
  82         }
  83
  84         (void)inflateEnd(&strm);
  85         return 0;
  86 }
  87 static inline size_t read_compress_length(unsigned char *buf)
  88 {
  89         __le32 dlen;
  90         memcpy(&dlen, buf, LZO_LEN);
  91         return le32_to_cpu(dlen);
  92 }
  93
  94 static int decompress_lzo(unsigned char *inbuf, char *outbuf, u64 compress_len,
  95                           u64 *decompress_len)
  96 {
  97         size_t new_len;
  98         size_t in_len;
  99         size_t out_len = 0;
 100         size_t tot_len;
 101         size_t tot_in;
 102         int ret;
 103
 104         ret = lzo_init();
 105         if (ret != LZO_E_OK) {
 106                 fprintf(stderr, "lzo init returned %d\n", ret);
 107                 return -1;
 108         }
 109
 110         tot_len = read_compress_length(inbuf);
 111         inbuf += LZO_LEN;
 112         tot_in = LZO_LEN;
 113
 114         while (tot_in < tot_len) {
 115                 size_t mod_page;
 116                 size_t rem_page;
 117                 in_len = read_compress_length(inbuf);
 118
 119                 if ((tot_in + LZO_LEN + in_len) > tot_len) {
 120                         fprintf(stderr, "bad compress length %lu\n",
 121                                 (unsigned long)in_len);
 122                         return -1;
 123                 }
 124
 125                 inbuf += LZO_LEN;
 126                 tot_in += LZO_LEN;
 127
 128                 new_len = lzo1x_worst_compress(PAGE_CACHE_SIZE);
 129                 ret = lzo1x_decompress_safe((const unsigned char *)inbuf, in_len,
 130                                             (unsigned char *)outbuf,
 131                                             (void *)&new_len, NULL);
 132                 if (ret != LZO_E_OK) {
 133                         fprintf(stderr, "failed to inflate: %d\n", ret);
 134                         return -1;
 135                 }
 136                 out_len += new_len;
 137                 outbuf += new_len;
 138                 inbuf += in_len;
 139                 tot_in += in_len;
 140
 141                 /*
 142                  * If the 4 byte header does not fit to the rest of the page we
 143                  * have to move to the next one, unless we read some garbage
 144                  */
 145                 mod_page = tot_in % PAGE_CACHE_SIZE;
 146                 rem_page = PAGE_CACHE_SIZE - mod_page;
 147                 if (rem_page < LZO_LEN) {
 148                         inbuf += rem_page;
 149                         tot_in += rem_page;
 150                 }
 151         }
 152
 153         *decompress_len = out_len;
 154
 155         return 0;
 156 }
 157
 158 static int decompress(char *inbuf, char *outbuf, u64 compress_len,
 159                       u64 *decompress_len, int compress)
 160 {
 161         switch (compress) {
 162         case BTRFS_COMPRESS_ZLIB:
 163                 return decompress_zlib(inbuf, outbuf, compress_len,
 164                                        *decompress_len);
 165         case BTRFS_COMPRESS_LZO:
 166                 return decompress_lzo((unsigned char *)inbuf, outbuf, compress_len,
 167                                       decompress_len);
 168         default:
 169                 break;
 170         }
 171
 172         fprintf(stderr, "invalid compression type: %d\n", compress);
 173         return -1;
 174 }
 175
 176 static int next_leaf(struct btrfs_root *root, struct btrfs_path *path)
 177 {
 178         int slot;
 179         int level = 1;
 180         int offset = 1;
 181         struct extent_buffer *c;
 182         struct extent_buffer *next = NULL;
 183
 184 again:
 185         for (; level < BTRFS_MAX_LEVEL; level++) {
 186                 if (path->nodes[level])
 187                         break;
 188         }
 189
 190         if (level >= BTRFS_MAX_LEVEL)
 191                 return 1;
 192
 193         slot = path->slots[level] + 1;
 194
 195         while(level < BTRFS_MAX_LEVEL) {
 196                 if (!path->nodes[level])
 197                         return 1;
 198
 199                 slot = path->slots[level] + offset;
 200                 c = path->nodes[level];
 201                 if (slot >= btrfs_header_nritems(c)) {
 202                         level++;
 203                         if (level == BTRFS_MAX_LEVEL)
 204                                 return 1;
 205                         offset = 1;
 206                         continue;
 207                 }
 208
 209                 if (path->reada)
 210                         reada_for_search(root, path, level, slot, 0);
 211
 212                 next = read_node_slot(root, c, slot);
 213                 if (extent_buffer_uptodate(next))
 214                         break;
 215                 offset++;
 216         }
 217         path->slots[level] = slot;
 218         while(1) {
 219                 level--;
 220                 c = path->nodes[level];
 221                 free_extent_buffer(c);
 222                 path->nodes[level] = next;
 223                 path->slots[level] = 0;
 224                 if (!level)
 225                         break;
 226                 if (path->reada)
 227                         reada_for_search(root, path, level, 0, 0);
 228                 next = read_node_slot(root, next, 0);
 229                 if (!extent_buffer_uptodate(next))
 230                         goto again;
 231         }
 232         return 0;
 233 }
 234
 235 static int copy_one_inline(int fd, struct btrfs_path *path, u64 pos)
 236 {
 237         struct extent_buffer *leaf = path->nodes[0];
 238         struct btrfs_file_extent_item *fi;
 239         char buf[4096];
 240         char *outbuf;
 241         u64 ram_size;
 242         ssize_t done;
 243         unsigned long ptr;
 244         int ret;
 245         int len;
 246         int inline_item_len;
 247         int compress;
 248
 249         fi = btrfs_item_ptr(leaf, path->slots[0],
 250                             struct btrfs_file_extent_item);
 251         ptr = btrfs_file_extent_inline_start(fi);
 252         len = btrfs_file_extent_inline_len(leaf, path->slots[0], fi);
 253         inline_item_len = btrfs_file_extent_inline_item_len(leaf, btrfs_item_nr(path->slots[0]));
 254         read_extent_buffer(leaf, buf, ptr, inline_item_len);
 255
 256         compress = btrfs_file_extent_compression(leaf, fi);
 257         if (compress == BTRFS_COMPRESS_NONE) {
 258                 done = pwrite(fd, buf, len, pos);
 259                 if (done < len) {
 260                         fprintf(stderr, "Short inline write, wanted %d, did "
 261                                 "%zd: %d\n", len, done, errno);
 262                         return -1;
 263                 }
 264                 return 0;
 265         }
 266
 267         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 268         outbuf = calloc(1, ram_size);
 269         if (!outbuf) {
 270                 fprintf(stderr, "No memory\n");
 271                 return -ENOMEM;
 272         }
 273
 274         ret = decompress(buf, outbuf, len, &ram_size, compress);
 275         if (ret) {
 276                 free(outbuf);
 277                 return ret;
 278         }
 279
 280         done = pwrite(fd, outbuf, ram_size, pos);
 281         free(outbuf);
 282         if (done < ram_size) {
 283                 fprintf(stderr, "Short compressed inline write, wanted %Lu, "
 284                         "did %zd: %d\n", ram_size, done, errno);
 285                 return -1;
 286         }
 287
 288         return 0;
 289 }
 290
 291 static int copy_one_extent(struct btrfs_root *root, int fd,
 292                            struct extent_buffer *leaf,
 293                            struct btrfs_file_extent_item *fi, u64 pos)
 294 {
 295         struct btrfs_multi_bio *multi = NULL;
 296         struct btrfs_device *device;
 297         char *inbuf, *outbuf = NULL;
 298         ssize_t done, total = 0;
 299         u64 bytenr;
 300         u64 ram_size;
 301         u64 disk_size;
 302         u64 num_bytes;
 303         u64 length;
 304         u64 size_left;
 305         u64 dev_bytenr;
 306         u64 offset;
 307         u64 count = 0;
 308         int compress;
 309         int ret;
 310         int dev_fd;
 311         int mirror_num = 1;
 312         int num_copies;
 313
 314         compress = btrfs_file_extent_compression(leaf, fi);
 315         bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
 316         disk_size = btrfs_file_extent_disk_num_bytes(leaf, fi);
 317         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 318         offset = btrfs_file_extent_offset(leaf, fi);
 319         num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
 320         size_left = disk_size;
 321         if (compress == BTRFS_COMPRESS_NONE)
 322                 bytenr += offset;
 323
 324         if (verbose && offset)
 325                 printf("offset is %Lu\n", offset);
 326         /* we found a hole */
 327         if (disk_size == 0)
 328                 return 0;
 329
 330         inbuf = malloc(size_left);
 331         if (!inbuf) {
 332                 fprintf(stderr, "No memory\n");
 333                 return -ENOMEM;
 334         }
 335
 336         if (compress != BTRFS_COMPRESS_NONE) {
 337                 outbuf = calloc(1, ram_size);
 338                 if (!outbuf) {
 339                         fprintf(stderr, "No memory\n");
 340                         free(inbuf);
 341                         return -ENOMEM;
 342                 }
 343         }
 344 again:
 345         length = size_left;
 346         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 347                               bytenr, &length, &multi, mirror_num, NULL);
 348         if (ret) {
 349                 fprintf(stderr, "Error mapping block %d\n", ret);
 350                 goto out;
 351         }
 352         device = multi->stripes[0].dev;
 353         dev_fd = device->fd;
 354         device->total_ios++;
 355         dev_bytenr = multi->stripes[0].physical;
 356         kfree(multi);
 357
 358         if (size_left < length)
 359                 length = size_left;
 360
 361         done = pread(dev_fd, inbuf+count, length, dev_bytenr);
 362         /* Need both checks, or we miss negative values due to u64 conversion */
 363         if (done < 0 || done < length) {
 364                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 365                                               bytenr, length);
 366                 mirror_num++;
 367                 /* mirror_num is 1-indexed, so num_copies is a valid mirror. */
 368                 if (mirror_num > num_copies) {
 369                         ret = -1;
 370                         fprintf(stderr, "Exhausted mirrors trying to read\n");
 371                         goto out;
 372                 }
 373                 fprintf(stderr, "Trying another mirror\n");
 374                 goto again;
 375         }
 376
 377         mirror_num = 1;
 378         size_left -= length;
 379         count += length;
 380         bytenr += length;
 381         if (size_left)
 382                 goto again;
 383
 384         if (compress == BTRFS_COMPRESS_NONE) {
 385                 while (total < num_bytes) {
 386                         done = pwrite(fd, inbuf+total, num_bytes-total,
 387                                       pos+total);
 388                         if (done < 0) {
 389                                 ret = -1;
 390                                 fprintf(stderr, "Error writing: %d %s\n", errno, strerror(errno));
 391                                 goto out;
 392                         }
 393                         total += done;
 394                 }
 395                 ret = 0;
 396                 goto out;
 397         }
 398
 399         ret = decompress(inbuf, outbuf, disk_size, &ram_size, compress);
 400         if (ret) {
 401                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 402                                               bytenr, length);
 403                 mirror_num++;
 404                 if (mirror_num >= num_copies) {
 405                         ret = -1;
 406                         goto out;
 407                 }
 408                 fprintf(stderr, "Trying another mirror\n");
 409                 goto again;
 410         }
 411
 412         while (total < num_bytes) {
 413                 done = pwrite(fd, outbuf + offset + total,
 414                               num_bytes - total,
 415                               pos + total);
 416                 if (done < 0) {
 417                         ret = -1;
 418                         goto out;
 419                 }
 420                 total += done;
 421         }
 422 out:
 423         free(inbuf);
 424         free(outbuf);
 425         return ret;
 426 }
 427
 428 enum loop_response {
 429         LOOP_STOP,
 430         LOOP_CONTINUE,
 431         LOOP_DONTASK
 432 };
 433
 434 static enum loop_response ask_to_continue(const char *file)
 435 {
 436         char buf[2];
 437         char *ret;
 438
 439         printf("We seem to be looping a lot on %s, do you want to keep going "
 440                "on ? (y/N/a): ", file);
 441 again:
 442         ret = fgets(buf, 2, stdin);
 443         if (*ret == '\n' || tolower(*ret) == 'n')
 444                 return LOOP_STOP;
 445         if (tolower(*ret) == 'a')
 446                 return LOOP_DONTASK;
 447         if (tolower(*ret) != 'y') {
 448                 printf("Please enter one of 'y', 'n', or 'a': ");
 449                 goto again;
 450         }
 451
 452         return LOOP_CONTINUE;
 453 }
 454
 455
 456 static int set_file_xattrs(struct btrfs_root *root, u64 inode,
 457                            int fd, const char *file_name)
 458 {
 459         struct btrfs_key key;
 460         struct btrfs_path *path;
 461         struct extent_buffer *leaf;
 462         struct btrfs_dir_item *di;
 463         u32 name_len = 0;
 464         u32 data_len = 0;
 465         u32 len = 0;
 466         u32 cur, total_len;
 467         char *name = NULL;
 468         char *data = NULL;
 469         int ret = 0;
 470
 471         key.objectid = inode;
 472         key.type = BTRFS_XATTR_ITEM_KEY;
 473         key.offset = 0;
 474
 475         path = btrfs_alloc_path();
 476         if (!path)
 477                 return -ENOMEM;
 478
 479         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
 480         if (ret < 0)
 481                 goto out;
 482
 483         leaf = path->nodes[0];
 484         while (1) {
 485                 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
 486                         do {
 487                                 ret = next_leaf(root, path);
 488                                 if (ret < 0) {
 489                                         fprintf(stderr,
 490                                                 "Error searching for extended attributes: %d\n",
 491                                                 ret);
 492                                         goto out;
 493                                 } else if (ret) {
 494                                         /* No more leaves to search */
 495                                         ret = 0;
 496                                         goto out;
 497                                 }
 498                                 leaf = path->nodes[0];
 499                         } while (!leaf);
 500                         continue;
 501                 }
 502
 503                 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
 504                 if (key.type != BTRFS_XATTR_ITEM_KEY || key.objectid != inode)
 505                         break;
 506                 cur = 0;
 507                 total_len = btrfs_item_size_nr(leaf, path->slots[0]);
 508                 di = btrfs_item_ptr(leaf, path->slots[0],
 509                                     struct btrfs_dir_item);
 510
 511                 while (cur < total_len) {
 512                         len = btrfs_dir_name_len(leaf, di);
 513                         if (len > name_len) {
 514                                 free(name);
 515                                 name = (char *) malloc(len + 1);
 516                                 if (!name) {
 517                                         ret = -ENOMEM;
 518                                         goto out;
 519                                 }
 520                         }
 521                         read_extent_buffer(leaf, name,
 522                                            (unsigned long)(di + 1), len);
 523                         name[len] = '\0';
 524                         name_len = len;
 525
 526                         len = btrfs_dir_data_len(leaf, di);
 527                         if (len > data_len) {
 528                                 free(data);
 529                                 data = (char *) malloc(len);
 530                                 if (!data) {
 531                                         ret = -ENOMEM;
 532                                         goto out;
 533                                 }
 534                         }
 535                         read_extent_buffer(leaf, data,
 536                                            (unsigned long)(di + 1) + name_len,
 537                                            len);
 538                         data_len = len;
 539
 540                         if (fsetxattr(fd, name, data, data_len, 0)) {
 541                                 int err = errno;
 542
 543                                 fprintf(stderr,
 544                                         "Error setting extended attribute %s on file %s: %s\n",
 545                                         name, file_name, strerror(err));
 546                         }
 547
 548                         len = sizeof(*di) + name_len + data_len;
 549                         cur += len;
 550                         di = (struct btrfs_dir_item *)((char *)di + len);
 551                 }
 552                 path->slots[0]++;
 553         }
 554         ret = 0;
 555 out:
 556         btrfs_free_path(path);
 557         free(name);
 558         free(data);
 559
 560         return ret;
 561 }
 562
 563 static int copy_metadata(struct btrfs_root *root, int fd,
 564                 struct btrfs_key *key)
 565 {
 566         struct btrfs_path *path;
 567         struct btrfs_inode_item *inode_item;
 568         int ret;
 569
 570         path = btrfs_alloc_path();
 571         if (!path) {
 572                 fprintf(stderr, "ERROR: Ran out of memory\n");
 573                 return -ENOMEM;
 574         }
 575
 576         ret = btrfs_lookup_inode(NULL, root, path, key, 0);
 577         if (ret == 0) {
 578                 struct btrfs_timespec *bts;
 579                 struct timespec times[2];
 580
 581                 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
 582                                 struct btrfs_inode_item);
 583
 584                 ret = fchown(fd, btrfs_inode_uid(path->nodes[0], inode_item),
 585                                 btrfs_inode_gid(path->nodes[0], inode_item));
 586                 if (ret) {
 587                         fprintf(stderr, "ERROR: Failed to change owner: %s\n",
 588                                         strerror(errno));
 589                         goto out;
 590                 }
 591
 592                 ret = fchmod(fd, btrfs_inode_mode(path->nodes[0], inode_item));
 593                 if (ret) {
 594                         fprintf(stderr, "ERROR: Failed to change mode: %s\n",
 595                                         strerror(errno));
 596                         goto out;
 597                 }
 598
 599                 bts = btrfs_inode_atime(inode_item);
 600                 times[0].tv_sec = btrfs_timespec_sec(path->nodes[0], bts);
 601                 times[0].tv_nsec = btrfs_timespec_nsec(path->nodes[0], bts);
 602
 603                 bts = btrfs_inode_mtime(inode_item);
 604                 times[1].tv_sec = btrfs_timespec_sec(path->nodes[0], bts);
 605                 times[1].tv_nsec = btrfs_timespec_nsec(path->nodes[0], bts);
 606
 607                 ret = futimens(fd, times);
 608                 if (ret) {
 609                         fprintf(stderr, "ERROR: Failed to set times: %s\n",
 610                                         strerror(errno));
 611                         goto out;
 612                 }
 613         }
 614 out:
 615         btrfs_free_path(path);
 616         return ret;
 617 }
 618
 619 static int copy_file(struct btrfs_root *root, int fd, struct btrfs_key *key,
 620                      const char *file)
 621 {
 622         struct extent_buffer *leaf;
 623         struct btrfs_path *path;
 624         struct btrfs_file_extent_item *fi;
 625         struct btrfs_inode_item *inode_item;
 626         struct btrfs_timespec *bts;
 627         struct btrfs_key found_key;
 628         int ret;
 629         int extent_type;
 630         int compression;
 631         int loops = 0;
 632         u64 found_size = 0;
 633         struct timespec times[2];
 634         int times_ok = 0;
 635
 636         path = btrfs_alloc_path();
 637         if (!path) {
 638                 fprintf(stderr, "Ran out of memory\n");
 639                 return -ENOMEM;
 640         }
 641
 642         ret = btrfs_lookup_inode(NULL, root, path, key, 0);
 643         if (ret == 0) {
 644                 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
 645                                     struct btrfs_inode_item);
 646                 found_size = btrfs_inode_size(path->nodes[0], inode_item);
 647
 648                 if (restore_metadata) {
 649                         /*
 650                          * Change the ownership and mode now, set times when
 651                          * copyout is finished.
 652                          */
 653
 654                         ret = fchown(fd, btrfs_inode_uid(path->nodes[0], inode_item),
 655                                         btrfs_inode_gid(path->nodes[0], inode_item));
 656                         if (ret && !ignore_errors)
 657                                 goto out;
 658
 659                         ret = fchmod(fd, btrfs_inode_mode(path->nodes[0], inode_item));
 660                         if (ret && !ignore_errors)
 661                                 goto out;
 662
 663                         bts = btrfs_inode_atime(inode_item);
 664                         times[0].tv_sec = btrfs_timespec_sec(path->nodes[0], bts);
 665                         times[0].tv_nsec = btrfs_timespec_nsec(path->nodes[0], bts);
 666
 667                         bts = btrfs_inode_mtime(inode_item);
 668                         times[1].tv_sec = btrfs_timespec_sec(path->nodes[0], bts);
 669                         times[1].tv_nsec = btrfs_timespec_nsec(path->nodes[0], bts);
 670                         times_ok = 1;
 671                 }
 672         }
 673         btrfs_release_path(path);
 674
 675         key->offset = 0;
 676         key->type = BTRFS_EXTENT_DATA_KEY;
 677
 678         ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
 679         if (ret < 0) {
 680                 fprintf(stderr, "Error searching %d\n", ret);
 681                 goto out;
 682         }
 683
 684         leaf = path->nodes[0];
 685         while (!leaf) {
 686                 ret = next_leaf(root, path);
 687                 if (ret < 0) {
 688                         fprintf(stderr, "Error getting next leaf %d\n",
 689                                 ret);
 690                         goto out;
 691                 } else if (ret > 0) {
 692                         /* No more leaves to search */
 693                         ret = 0;
 694                         goto out;
 695                 }
 696                 leaf = path->nodes[0];
 697         }
 698
 699         while (1) {
 700                 if (loops >= 0 && loops++ >= 1024) {
 701                         enum loop_response resp;
 702
 703                         resp = ask_to_continue(file);
 704                         if (resp == LOOP_STOP)
 705                                 break;
 706                         else if (resp == LOOP_CONTINUE)
 707                                 loops = 0;
 708                         else if (resp == LOOP_DONTASK)
 709                                 loops = -1;
 710                 }
 711                 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
 712                         do {
 713                                 ret = next_leaf(root, path);
 714                                 if (ret < 0) {
 715                                         fprintf(stderr, "Error searching %d\n", ret);
 716                                         goto out;
 717                                 } else if (ret) {
 718                                         /* No more leaves to search */
 719                                         btrfs_free_path(path);
 720                                         goto set_size;
 721                                 }
 722                                 leaf = path->nodes[0];
 723                         } while (!leaf);
 724                         continue;
 725                 }
 726                 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
 727                 if (found_key.objectid != key->objectid)
 728                         break;
 729                 if (found_key.type != key->type)
 730                         break;
 731                 fi = btrfs_item_ptr(leaf, path->slots[0],
 732                                     struct btrfs_file_extent_item);
 733                 extent_type = btrfs_file_extent_type(leaf, fi);
 734                 compression = btrfs_file_extent_compression(leaf, fi);
 735                 if (compression >= BTRFS_COMPRESS_LAST) {
 736                         fprintf(stderr, "Don't support compression yet %d\n",
 737                                 compression);
 738                         ret = -1;
 739                         goto out;
 740                 }
 741
 742                 if (extent_type == BTRFS_FILE_EXTENT_PREALLOC)
 743                         goto next;
 744                 if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
 745                         ret = copy_one_inline(fd, path, found_key.offset);
 746                         if (ret)
 747                                 goto out;
 748                 } else if (extent_type == BTRFS_FILE_EXTENT_REG) {
 749                         ret = copy_one_extent(root, fd, leaf, fi,
 750                                               found_key.offset);
 751                         if (ret)
 752                                 goto out;
 753                 } else {
 754                         printf("Weird extent type %d\n", extent_type);
 755                 }
 756 next:
 757                 path->slots[0]++;
 758         }
 759
 760         btrfs_free_path(path);
 761 set_size:
 762         if (found_size) {
 763                 ret = ftruncate(fd, (loff_t)found_size);
 764                 if (ret)
 765                         return ret;
 766         }
 767         if (get_xattrs) {
 768                 ret = set_file_xattrs(root, key->objectid, fd, file);
 769                 if (ret)
 770                         return ret;
 771         }
 772         if (restore_metadata && times_ok) {
 773                 ret = futimens(fd, times);
 774                 if (ret)
 775                         return ret;
 776         }
 777         return 0;
 778
 779 out:
 780         btrfs_free_path(path);
 781         return ret;
 782 }
 783
 784 static int search_dir(struct btrfs_root *root, struct btrfs_key *key,
 785                       const char *output_rootdir, const char *in_dir,
 786                       const regex_t *mreg)
 787 {
 788         struct btrfs_path *path;
 789         struct extent_buffer *leaf;
 790         struct btrfs_dir_item *dir_item;
 791         struct btrfs_key found_key, location;
 792         char filename[BTRFS_NAME_LEN + 1];
 793         unsigned long name_ptr;
 794         int name_len;
 795         int ret = 0;
 796         int fd;
 797         int loops = 0;
 798         u8 type;
 799
 800         path = btrfs_alloc_path();
 801         if (!path) {
 802                 fprintf(stderr, "Ran out of memory\n");
 803                 return -ENOMEM;
 804         }
 805
 806         key->offset = 0;
 807         key->type = BTRFS_DIR_INDEX_KEY;
 808
 809         ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
 810         if (ret < 0) {
 811                 fprintf(stderr, "Error searching %d\n", ret);
 812                 goto out;
 813         }
 814
 815         leaf = path->nodes[0];
 816         while (!leaf) {
 817                 if (verbose > 1)
 818                         printf("No leaf after search, looking for the next "
 819                                "leaf\n");
 820                 ret = next_leaf(root, path);
 821                 if (ret < 0) {
 822                         fprintf(stderr, "Error getting next leaf %d\n",
 823                                 ret);
 824                         goto out;
 825                 } else if (ret > 0) {
 826                         /* No more leaves to search */
 827                         if (verbose)
 828                                 printf("Reached the end of the tree looking "
 829                                        "for the directory\n");
 830                         ret = 0;
 831                         goto out;
 832                 }
 833                 leaf = path->nodes[0];
 834         }
 835
 836         while (leaf) {
 837                 if (loops++ >= 1024) {
 838                         printf("We have looped trying to restore files in %s "
 839                                "too many times to be making progress, "
 840                                "stopping\n", in_dir);
 841                         break;
 842                 }
 843
 844                 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
 845                         do {
 846                                 ret = next_leaf(root, path);
 847                                 if (ret < 0) {
 848                                         fprintf(stderr, "Error searching %d\n",
 849                                                 ret);
 850                                         goto out;
 851                                 } else if (ret > 0) {
 852                                         /* No more leaves to search */
 853                                         if (verbose)
 854                                                 printf("Reached the end of "
 855                                                        "the tree searching the"
 856                                                        " directory\n");
 857                                         ret = 0;
 858                                         goto out;
 859                                 }
 860                                 leaf = path->nodes[0];
 861                         } while (!leaf);
 862                         continue;
 863                 }
 864                 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
 865                 if (found_key.objectid != key->objectid) {
 866                         if (verbose > 1)
 867                                 printf("Found objectid=%Lu, key=%Lu\n",
 868                                        found_key.objectid, key->objectid);
 869                         break;
 870                 }
 871                 if (found_key.type != key->type) {
 872                         if (verbose > 1)
 873                                 printf("Found type=%u, want=%u\n",
 874                                        found_key.type, key->type);
 875                         break;
 876                 }
 877                 dir_item = btrfs_item_ptr(leaf, path->slots[0],
 878                                           struct btrfs_dir_item);
 879                 name_ptr = (unsigned long)(dir_item + 1);
 880                 name_len = btrfs_dir_name_len(leaf, dir_item);
 881                 read_extent_buffer(leaf, filename, name_ptr, name_len);
 882                 filename[name_len] = '\0';
 883                 type = btrfs_dir_type(leaf, dir_item);
 884                 btrfs_dir_item_key_to_cpu(leaf, dir_item, &location);
 885
 886                 /* full path from root of btrfs being restored */
 887                 snprintf(fs_name, PATH_MAX, "%s/%s", in_dir, filename);
 888
 889                 if (mreg && REG_NOMATCH == regexec(mreg, fs_name, 0, NULL, 0))
 890                         goto next;
 891
 892                 /* full path from system root */
 893                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, fs_name);
 894
 895                 /*
 896                  * At this point we're only going to restore directories and
 897                  * files, no symlinks or anything else.
 898                  */
 899                 if (type == BTRFS_FT_REG_FILE) {
 900                         if (!overwrite) {
 901                                 static int warn = 0;
 902                                 struct stat st;
 903
 904                                 ret = stat(path_name, &st);
 905                                 if (!ret) {
 906                                         loops = 0;
 907                                         if (verbose || !warn)
 908                                                 printf("Skipping existing file"
 909                                                        " %s\n", path_name);
 910                                         if (warn)
 911                                                 goto next;
 912                                         printf("If you wish to overwrite use "
 913                                                "the -o option to overwrite\n");
 914                                         warn = 1;
 915                                         goto next;
 916                                 }
 917                                 ret = 0;
 918                         }
 919                         if (verbose)
 920                                 printf("Restoring %s\n", path_name);
 921                         if (dry_run)
 922                                 goto next;
 923                         fd = open(path_name, O_CREAT|O_WRONLY, 0644);
 924                         if (fd < 0) {
 925                                 fprintf(stderr, "Error creating %s: %d\n",
 926                                         path_name, errno);
 927                                 if (ignore_errors)
 928                                         goto next;
 929                                 ret = -1;
 930                                 goto out;
 931                         }
 932                         loops = 0;
 933                         ret = copy_file(root, fd, &location, path_name);
 934                         close(fd);
 935                         if (ret) {
 936                                 fprintf(stderr, "Error copying data for %s\n",
 937                                         path_name);
 938                                 if (ignore_errors)
 939                                         goto next;
 940                                 goto out;
 941                         }
 942                 } else if (type == BTRFS_FT_DIR) {
 943                         struct btrfs_root *search_root = root;
 944                         char *dir = strdup(fs_name);
 945
 946                         if (!dir) {
 947                                 fprintf(stderr, "Ran out of memory\n");
 948                                 ret = -ENOMEM;
 949                                 goto out;
 950                         }
 951
 952                         if (location.type == BTRFS_ROOT_ITEM_KEY) {
 953                                 /*
 954                                  * If we are a snapshot and this is the index
 955                                  * object to ourselves just skip it.
 956                                  */
 957                                 if (location.objectid ==
 958                                     root->root_key.objectid) {
 959                                         free(dir);
 960                                         goto next;
 961                                 }
 962
 963                                 location.offset = (u64)-1;
 964                                 search_root = btrfs_read_fs_root(root->fs_info,
 965                                                                  &location);
 966                                 if (IS_ERR(search_root)) {
 967                                         free(dir);
 968                                         fprintf(stderr, "Error reading "
 969                                                 "subvolume %s: %lu\n",
 970                                                 path_name,
 971                                                 PTR_ERR(search_root));
 972                                         if (ignore_errors)
 973                                                 goto next;
 974                                         ret = PTR_ERR(search_root);
 975                                         goto out;
 976                                 }
 977
 978                                 /*
 979                                  * A subvolume will have a key.offset of 0, a
 980                                  * snapshot will have key.offset of a transid.
 981                                  */
 982                                 if (search_root->root_key.offset != 0 &&
 983                                     get_snaps == 0) {
 984                                         free(dir);
 985                                         printf("Skipping snapshot %s\n",
 986                                                filename);
 987                                         goto next;
 988                                 }
 989                                 location.objectid = BTRFS_FIRST_FREE_OBJECTID;
 990                         }
 991
 992                         if (verbose)
 993                                 printf("Restoring %s\n", path_name);
 994
 995                         errno = 0;
 996                         if (dry_run)
 997                                 ret = 0;
 998                         else
 999                                 ret = mkdir(path_name, 0755);
1000                         if (ret && errno != EEXIST) {
1001                                 free(dir);
1002                                 fprintf(stderr, "Error mkdiring %s: %d\n",
1003                                         path_name, errno);
1004                                 if (ignore_errors)
1005                                         goto next;
1006                                 ret = -1;
1007                                 goto out;
1008                         }
1009                         loops = 0;
1010                         ret = search_dir(search_root, &location,
1011                                          output_rootdir, dir, mreg);
1012                         free(dir);
1013                         if (ret) {
1014                                 fprintf(stderr, "Error searching %s\n",
1015                                         path_name);
1016                                 if (ignore_errors)
1017                                         goto next;
1018                                 goto out;
1019                         }
1020                 }
1021 next:
1022                 path->slots[0]++;
1023         }
1024
1025         if (restore_metadata) {
1026                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, in_dir);
1027                 fd = open(path_name, O_RDONLY);
1028                 if (fd < 0) {
1029                         fprintf(stderr, "ERROR: Failed to access %s to restore metadata\n",
1030                                         path_name);
1031                         if (!ignore_errors) {
1032                                 ret = -1;
1033                                 goto out;
1034                         }
1035                 } else {
1036                         /*
1037                          * Set owner/mode/time on the directory as well
1038                          */
1039                         key->type = BTRFS_INODE_ITEM_KEY;
1040                         ret = copy_metadata(root, fd, key);
1041                         close(fd);
1042                         if (ret && !ignore_errors)
1043                                 goto out;
1044                 }
1045         }
1046
1047         if (verbose)
1048                 printf("Done searching %s\n", in_dir);
1049 out:
1050         btrfs_free_path(path);
1051         return ret;
1052 }
1053
1054 static int do_list_roots(struct btrfs_root *root)
1055 {
1056         struct btrfs_key key;
1057         struct btrfs_key found_key;
1058         struct btrfs_disk_key disk_key;
1059         struct btrfs_path *path;
1060         struct extent_buffer *leaf;
1061         struct btrfs_root_item ri;
1062         unsigned long offset;
1063         int slot;
1064         int ret;
1065
1066         root = root->fs_info->tree_root;
1067         path = btrfs_alloc_path();
1068         if (!path) {
1069                 fprintf(stderr, "Failed to alloc path\n");
1070                 return -ENOMEM;
1071         }
1072
1073         key.offset = 0;
1074         key.objectid = 0;
1075         key.type = BTRFS_ROOT_ITEM_KEY;
1076
1077         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1078         if (ret < 0) {
1079                 fprintf(stderr, "Failed to do search %d\n", ret);
1080                 btrfs_free_path(path);
1081                 return -1;
1082         }
1083
1084         leaf = path->nodes[0];
1085
1086         while (1) {
1087                 slot = path->slots[0];
1088                 if (slot >= btrfs_header_nritems(leaf)) {
1089                         ret = btrfs_next_leaf(root, path);
1090                         if (ret)
1091                                 break;
1092                         leaf = path->nodes[0];
1093                         slot = path->slots[0];
1094                 }
1095                 btrfs_item_key(leaf, &disk_key, slot);
1096                 btrfs_disk_key_to_cpu(&found_key, &disk_key);
1097                 if (btrfs_key_type(&found_key) != BTRFS_ROOT_ITEM_KEY) {
1098                         path->slots[0]++;
1099                         continue;
1100                 }
1101
1102                 offset = btrfs_item_ptr_offset(leaf, slot);
1103                 read_extent_buffer(leaf, &ri, offset, sizeof(ri));
1104                 printf(" tree ");
1105                 btrfs_print_key(&disk_key);
1106                 printf(" %Lu level %d\n", btrfs_root_bytenr(&ri),
1107                        btrfs_root_level(&ri));
1108                 path->slots[0]++;
1109         }
1110         btrfs_free_path(path);
1111
1112         return 0;
1113 }
1114
1115 static struct btrfs_root *open_fs(const char *dev, u64 root_location,
1116                                   int super_mirror, int list_roots)
1117 {
1118         struct btrfs_fs_info *fs_info = NULL;
1119         struct btrfs_root *root = NULL;
1120         u64 bytenr;
1121         int i;
1122
1123         for (i = super_mirror; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1124                 bytenr = btrfs_sb_offset(i);
1125                 fs_info = open_ctree_fs_info(dev, bytenr, root_location,
1126                                              OPEN_CTREE_PARTIAL);
1127                 if (fs_info)
1128                         break;
1129                 fprintf(stderr, "Could not open root, trying backup super\n");
1130         }
1131
1132         if (!fs_info)
1133                 return NULL;
1134
1135         /*
1136          * All we really need to succeed is reading the chunk tree, everything
1137          * else we can do by hand, since we only need to read the tree root and
1138          * the fs_root.
1139          */
1140         if (!extent_buffer_uptodate(fs_info->tree_root->node)) {
1141                 u64 generation;
1142
1143                 root = fs_info->tree_root;
1144                 if (!root_location)
1145                         root_location = btrfs_super_root(fs_info->super_copy);
1146                 generation = btrfs_super_generation(fs_info->super_copy);
1147                 root->node = read_tree_block(root, root_location,
1148                                              root->leafsize, generation);
1149                 if (!extent_buffer_uptodate(root->node)) {
1150                         fprintf(stderr, "Error opening tree root\n");
1151                         close_ctree(root);
1152                         return NULL;
1153                 }
1154         }
1155
1156         if (!list_roots && !fs_info->fs_root) {
1157                 struct btrfs_key key;
1158
1159                 key.objectid = BTRFS_FS_TREE_OBJECTID;
1160                 key.type = BTRFS_ROOT_ITEM_KEY;
1161                 key.offset = (u64)-1;
1162                 fs_info->fs_root = btrfs_read_fs_root_no_cache(fs_info, &key);
1163                 if (IS_ERR(fs_info->fs_root)) {
1164                         fprintf(stderr, "Couldn't read fs root: %ld\n",
1165                                 PTR_ERR(fs_info->fs_root));
1166                         close_ctree(fs_info->tree_root);
1167                         return NULL;
1168                 }
1169         }
1170
1171         if (list_roots && do_list_roots(fs_info->tree_root)) {
1172                 close_ctree(fs_info->tree_root);
1173                 return NULL;
1174         }
1175
1176         return fs_info->fs_root;
1177 }
1178
1179 static int find_first_dir(struct btrfs_root *root, u64 *objectid)
1180 {
1181         struct btrfs_path *path;
1182         struct btrfs_key found_key;
1183         struct btrfs_key key;
1184         int ret = -1;
1185         int i;
1186
1187         key.objectid = 0;
1188         key.type = BTRFS_DIR_INDEX_KEY;
1189         key.offset = 0;
1190
1191         path = btrfs_alloc_path();
1192         if (!path) {
1193                 fprintf(stderr, "Ran out of memory\n");
1194                 return ret;
1195         }
1196
1197         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1198         if (ret < 0) {
1199                 fprintf(stderr, "Error searching %d\n", ret);
1200                 goto out;
1201         }
1202
1203         if (!path->nodes[0]) {
1204                 fprintf(stderr, "No leaf!\n");
1205                 goto out;
1206         }
1207 again:
1208         for (i = path->slots[0];
1209              i < btrfs_header_nritems(path->nodes[0]); i++) {
1210                 btrfs_item_key_to_cpu(path->nodes[0], &found_key, i);
1211                 if (found_key.type != key.type)
1212                         continue;
1213
1214                 printf("Using objectid %Lu for first dir\n",
1215                        found_key.objectid);
1216                 *objectid = found_key.objectid;
1217                 ret = 0;
1218                 goto out;
1219         }
1220         do {
1221                 ret = next_leaf(root, path);
1222                 if (ret < 0) {
1223                         fprintf(stderr, "Error getting next leaf %d\n",
1224                                 ret);
1225                         goto out;
1226                 } else if (ret > 0) {
1227                         fprintf(stderr, "No more leaves\n");
1228                         goto out;
1229                 }
1230         } while (!path->nodes[0]);
1231         if (path->nodes[0])
1232                 goto again;
1233         printf("Couldn't find a dir index item\n");
1234 out:
1235         btrfs_free_path(path);
1236         return ret;
1237 }
1238
1239 const char * const cmd_restore_usage[] = {
1240         "btrfs restore [options] <device> <path> | -l <device>",
1241         "Try to restore files from a damaged filesystem (unmounted)",
1242         "",
1243         "-s              get snapshots",
1244         "-x              get extended attributes",
1245         "-m|--metadata   restore owner, mode and times",
1246         "-v              verbose",
1247         "-i              ignore errors",
1248         "-o              overwrite",
1249         "-t <bytenr>     tree location",
1250         "-f <bytenr>     filesystem location",
1251         "-u <mirror>     super mirror",
1252         "-r <rootid>     root objectid",
1253         "-d              find dir",
1254         "-l              list tree roots",
1255         "-D|--dry-run    dry run (only list files that would be recovered)",
1256         "--path-regex <regex>",
1257         "                restore only filenames matching regex,",
1258         "                you have to use following syntax (possibly quoted):",
1259         "                ^/(|home(|/username(|/Desktop(|/.*))))$",
1260         "-c              ignore case (--path-regex only)",
1261         NULL
1262 };
1263
1264 int cmd_restore(int argc, char **argv)
1265 {
1266         struct btrfs_root *root;
1267         struct btrfs_key key;
1268         char dir_name[128];
1269         u64 tree_location = 0;
1270         u64 fs_location = 0;
1271         u64 root_objectid = 0;
1272         int len;
1273         int ret;
1274         int super_mirror = 0;
1275         int find_dir = 0;
1276         int list_roots = 0;
1277         const char *match_regstr = NULL;
1278         int match_cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
1279         regex_t match_reg, *mreg = NULL;
1280         char reg_err[256];
1281
1282         while (1) {
1283                 int opt;
1284                 static const struct option long_options[] = {
1285                         { "path-regex", required_argument, NULL, 256},
1286                         { "dry-run", no_argument, NULL, 'D'},
1287                         { "metadata", no_argument, NULL, 'm'},
1288                         { NULL, 0, NULL, 0}
1289                 };
1290
1291                 opt = getopt_long(argc, argv, "sxviot:u:dmf:r:lDc", long_options,
1292                                         NULL);
1293                 if (opt < 0)
1294                         break;
1295
1296                 switch (opt) {
1297                         case 's':
1298                                 get_snaps = 1;
1299                                 break;
1300                         case 'v':
1301                                 verbose++;
1302                                 break;
1303                         case 'i':
1304                                 ignore_errors = 1;
1305                                 break;
1306                         case 'o':
1307                                 overwrite = 1;
1308                                 break;
1309                         case 't':
1310                                 tree_location = arg_strtou64(optarg);
1311                                 break;
1312                         case 'f':
1313                                 fs_location = arg_strtou64(optarg);
1314                                 break;
1315                         case 'u':
1316                                 super_mirror = arg_strtou64(optarg);
1317                                 if (super_mirror >= BTRFS_SUPER_MIRROR_MAX) {
1318                                         fprintf(stderr, "Super mirror not "
1319                                                 "valid\n");
1320                                         exit(1);
1321                                 }
1322                                 break;
1323                         case 'd':
1324                                 find_dir = 1;
1325                                 break;
1326                         case 'r':
1327                                 root_objectid = arg_strtou64(optarg);
1328                                 if (!is_fstree(root_objectid)) {
1329                                         fprintf(stderr, "objectid %llu is not a valid fs/file tree\n",
1330                                                         root_objectid);
1331                                         exit(1);
1332                                 }
1333                                 break;
1334                         case 'l':
1335                                 list_roots = 1;
1336                                 break;
1337                         case 'm':
1338                                 restore_metadata = 1;
1339                                 break;
1340                         case 'D':
1341                                 dry_run = 1;
1342                                 break;
1343                         case 'c':
1344                                 match_cflags |= REG_ICASE;
1345                                 break;
1346                         /* long option without single letter alternative */
1347                         case 256:
1348                                 match_regstr = optarg;
1349                                 break;
1350                         case 'x':
1351                                 get_xattrs = 1;
1352                                 break;
1353                         default:
1354                                 usage(cmd_restore_usage);
1355                 }
1356         }
1357
1358         if (!list_roots && check_argc_min(argc - optind, 2))
1359                 usage(cmd_restore_usage);
1360         else if (list_roots && check_argc_min(argc - optind, 1))
1361                 usage(cmd_restore_usage);
1362
1363         if (fs_location && root_objectid) {
1364                 fprintf(stderr, "don't use -f and -r at the same time.\n");
1365                 return 1;
1366         }
1367
1368         if ((ret = check_mounted(argv[optind])) < 0) {
1369                 fprintf(stderr, "Could not check mount status: %s\n",
1370                         strerror(-ret));
1371                 return 1;
1372         } else if (ret) {
1373                 fprintf(stderr, "%s is currently mounted.  Aborting.\n", argv[optind]);
1374                 return 1;
1375         }
1376
1377         root = open_fs(argv[optind], tree_location, super_mirror, list_roots);
1378         if (root == NULL)
1379                 return 1;
1380
1381         if (list_roots)
1382                 goto out;
1383
1384         if (fs_location != 0) {
1385                 free_extent_buffer(root->node);
1386                 root->node = read_tree_block(root, fs_location, root->leafsize, 0);
1387                 if (!extent_buffer_uptodate(root->node)) {
1388                         fprintf(stderr, "Failed to read fs location\n");
1389                         ret = 1;
1390                         goto out;
1391                 }
1392         }
1393
1394         memset(path_name, 0, PATH_MAX);
1395
1396         strncpy(dir_name, argv[optind + 1], sizeof dir_name);
1397         dir_name[sizeof dir_name - 1] = 0;
1398
1399         /* Strip the trailing / on the dir name */
1400         len = strlen(dir_name);
1401         while (len && dir_name[--len] == '/') {
1402                 dir_name[len] = '\0';
1403         }
1404
1405         if (root_objectid != 0) {
1406                 struct btrfs_root *orig_root = root;
1407
1408                 key.objectid = root_objectid;
1409                 key.type = BTRFS_ROOT_ITEM_KEY;
1410                 key.offset = (u64)-1;
1411                 root = btrfs_read_fs_root(orig_root->fs_info, &key);
1412                 if (IS_ERR(root)) {
1413                         fprintf(stderr, "fail to read root %llu: %s\n",
1414                                         root_objectid, strerror(-PTR_ERR(root)));
1415                         root = orig_root;
1416                         ret = 1;
1417                         goto out;
1418                 }
1419                 key.type = 0;
1420                 key.offset = 0;
1421         }
1422
1423         if (find_dir) {
1424                 ret = find_first_dir(root, &key.objectid);
1425                 if (ret)
1426                         goto out;
1427         } else {
1428                 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
1429         }
1430
1431         if (match_regstr) {
1432                 ret = regcomp(&match_reg, match_regstr, match_cflags);
1433                 if (ret) {
1434                         regerror(ret, &match_reg, reg_err, sizeof(reg_err));
1435                         fprintf(stderr, "Regex compile failed: %s\n", reg_err);
1436                         goto out;
1437                 }
1438                 mreg = &match_reg;
1439         }
1440
1441         if (dry_run)
1442                 printf("This is a dry-run, no files are going to be restored\n");
1443
1444         ret = search_dir(root, &key, dir_name, "", mreg);
1445
1446 out:
1447         if (mreg)
1448                 regfree(mreg);
1449         close_ctree(root);
1450         return !!ret;
1451 }