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 #include "help.h"
  46
  47 static char fs_name[PATH_MAX];
  48 static char path_name[PATH_MAX];
  49 static char symlink_target[PATH_MAX];
  50 static int get_snaps = 0;
  51 static int verbose = 0;
  52 static int restore_metadata = 0;
  53 static int restore_symlinks = 0;
  54 static int ignore_errors = 0;
  55 static int overwrite = 0;
  56 static int get_xattrs = 0;
  57 static int dry_run = 0;
  58
  59 #define LZO_LEN 4
  60 #define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3)
  61
  62 static int decompress_zlib(char *inbuf, char *outbuf, u64 compress_len,
  63                            u64 decompress_len)
  64 {
  65         z_stream strm;
  66         int ret;
  67
  68         memset(&strm, 0, sizeof(strm));
  69         ret = inflateInit(&strm);
  70         if (ret != Z_OK) {
  71                 error("zlib init returned %d", ret);
  72                 return -1;
  73         }
  74
  75         strm.avail_in = compress_len;
  76         strm.next_in = (unsigned char *)inbuf;
  77         strm.avail_out = decompress_len;
  78         strm.next_out = (unsigned char *)outbuf;
  79         ret = inflate(&strm, Z_NO_FLUSH);
  80         if (ret != Z_STREAM_END) {
  81                 (void)inflateEnd(&strm);
  82                 error("zlib inflate failed: %d", ret);
  83                 return -1;
  84         }
  85
  86         (void)inflateEnd(&strm);
  87         return 0;
  88 }
  89 static inline size_t read_compress_length(unsigned char *buf)
  90 {
  91         __le32 dlen;
  92         memcpy(&dlen, buf, LZO_LEN);
  93         return le32_to_cpu(dlen);
  94 }
  95
  96 static int decompress_lzo(struct btrfs_root *root, unsigned char *inbuf,
  97                         char *outbuf, u64 compress_len, u64 *decompress_len)
  98 {
  99         size_t new_len;
 100         size_t in_len;
 101         size_t out_len = 0;
 102         size_t tot_len;
 103         size_t tot_in;
 104         int ret;
 105
 106         ret = lzo_init();
 107         if (ret != LZO_E_OK) {
 108                 error("lzo init returned %d", ret);
 109                 return -1;
 110         }
 111
 112         tot_len = read_compress_length(inbuf);
 113         inbuf += LZO_LEN;
 114         tot_in = LZO_LEN;
 115
 116         while (tot_in < tot_len) {
 117                 size_t mod_page;
 118                 size_t rem_page;
 119                 in_len = read_compress_length(inbuf);
 120
 121                 if ((tot_in + LZO_LEN + in_len) > tot_len) {
 122                         error("bad compress length %lu",
 123                                 (unsigned long)in_len);
 124                         return -1;
 125                 }
 126
 127                 inbuf += LZO_LEN;
 128                 tot_in += LZO_LEN;
 129                 new_len = lzo1x_worst_compress(root->sectorsize);
 130                 ret = lzo1x_decompress_safe((const unsigned char *)inbuf, in_len,
 131                                             (unsigned char *)outbuf,
 132                                             (void *)&new_len, NULL);
 133                 if (ret != LZO_E_OK) {
 134                         error("lzo decompress failed: %d", ret);
 135                         return -1;
 136                 }
 137                 out_len += new_len;
 138                 outbuf += new_len;
 139                 inbuf += in_len;
 140                 tot_in += in_len;
 141
 142                 /*
 143                  * If the 4 byte header does not fit to the rest of the page we
 144                  * have to move to the next one, unless we read some garbage
 145                  */
 146                 mod_page = tot_in % root->sectorsize;
 147                 rem_page = root->sectorsize - mod_page;
 148                 if (rem_page < LZO_LEN) {
 149                         inbuf += rem_page;
 150                         tot_in += rem_page;
 151                 }
 152         }
 153
 154         *decompress_len = out_len;
 155
 156         return 0;
 157 }
 158
 159 static int decompress(struct btrfs_root *root, char *inbuf, char *outbuf,
 160                         u64 compress_len, u64 *decompress_len, int compress)
 161 {
 162         switch (compress) {
 163         case BTRFS_COMPRESS_ZLIB:
 164                 return decompress_zlib(inbuf, outbuf, compress_len,
 165                                        *decompress_len);
 166         case BTRFS_COMPRESS_LZO:
 167                 return decompress_lzo(root, (unsigned char *)inbuf, outbuf,
 168                                         compress_len, decompress_len);
 169         default:
 170                 break;
 171         }
 172
 173         error("invalid compression type: %d", compress);
 174         return -1;
 175 }
 176
 177 static int next_leaf(struct btrfs_root *root, struct btrfs_path *path)
 178 {
 179         int slot;
 180         int level = 1;
 181         int offset = 1;
 182         struct extent_buffer *c;
 183         struct extent_buffer *next = NULL;
 184
 185 again:
 186         for (; level < BTRFS_MAX_LEVEL; level++) {
 187                 if (path->nodes[level])
 188                         break;
 189         }
 190
 191         if (level >= BTRFS_MAX_LEVEL)
 192                 return 1;
 193
 194         slot = path->slots[level] + 1;
 195
 196         while(level < BTRFS_MAX_LEVEL) {
 197                 if (!path->nodes[level])
 198                         return 1;
 199
 200                 slot = path->slots[level] + offset;
 201                 c = path->nodes[level];
 202                 if (slot >= btrfs_header_nritems(c)) {
 203                         level++;
 204                         if (level == BTRFS_MAX_LEVEL)
 205                                 return 1;
 206                         offset = 1;
 207                         continue;
 208                 }
 209
 210                 if (path->reada)
 211                         reada_for_search(root, path, level, slot, 0);
 212
 213                 next = read_node_slot(root, c, slot);
 214                 if (extent_buffer_uptodate(next))
 215                         break;
 216                 offset++;
 217         }
 218         path->slots[level] = slot;
 219         while(1) {
 220                 level--;
 221                 c = path->nodes[level];
 222                 free_extent_buffer(c);
 223                 path->nodes[level] = next;
 224                 path->slots[level] = 0;
 225                 if (!level)
 226                         break;
 227                 if (path->reada)
 228                         reada_for_search(root, path, level, 0, 0);
 229                 next = read_node_slot(root, next, 0);
 230                 if (!extent_buffer_uptodate(next))
 231                         goto again;
 232         }
 233         return 0;
 234 }
 235
 236 static int copy_one_inline(struct btrfs_root *root, int fd,
 237                                 struct btrfs_path *path, u64 pos)
 238 {
 239         struct extent_buffer *leaf = path->nodes[0];
 240         struct btrfs_file_extent_item *fi;
 241         char buf[4096];
 242         char *outbuf;
 243         u64 ram_size;
 244         ssize_t done;
 245         unsigned long ptr;
 246         int ret;
 247         int len;
 248         int inline_item_len;
 249         int compress;
 250
 251         fi = btrfs_item_ptr(leaf, path->slots[0],
 252                             struct btrfs_file_extent_item);
 253         ptr = btrfs_file_extent_inline_start(fi);
 254         len = btrfs_file_extent_inline_len(leaf, path->slots[0], fi);
 255         inline_item_len = btrfs_file_extent_inline_item_len(leaf, btrfs_item_nr(path->slots[0]));
 256         read_extent_buffer(leaf, buf, ptr, inline_item_len);
 257
 258         compress = btrfs_file_extent_compression(leaf, fi);
 259         if (compress == BTRFS_COMPRESS_NONE) {
 260                 done = pwrite(fd, buf, len, pos);
 261                 if (done < len) {
 262                         fprintf(stderr, "Short inline write, wanted %d, did "
 263                                 "%zd: %d\n", len, done, errno);
 264                         return -1;
 265                 }
 266                 return 0;
 267         }
 268
 269         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 270         outbuf = calloc(1, ram_size);
 271         if (!outbuf) {
 272                 error("not enough memory");
 273                 return -ENOMEM;
 274         }
 275
 276         ret = decompress(root, buf, outbuf, len, &ram_size, compress);
 277         if (ret) {
 278                 free(outbuf);
 279                 return ret;
 280         }
 281
 282         done = pwrite(fd, outbuf, ram_size, pos);
 283         free(outbuf);
 284         if (done < ram_size) {
 285                 fprintf(stderr, "Short compressed inline write, wanted %Lu, "
 286                         "did %zd: %d\n", ram_size, done, errno);
 287                 return -1;
 288         }
 289
 290         return 0;
 291 }
 292
 293 static int copy_one_extent(struct btrfs_root *root, int fd,
 294                            struct extent_buffer *leaf,
 295                            struct btrfs_file_extent_item *fi, u64 pos)
 296 {
 297         struct btrfs_multi_bio *multi = NULL;
 298         struct btrfs_device *device;
 299         char *inbuf, *outbuf = NULL;
 300         ssize_t done, total = 0;
 301         u64 bytenr;
 302         u64 ram_size;
 303         u64 disk_size;
 304         u64 num_bytes;
 305         u64 length;
 306         u64 size_left;
 307         u64 dev_bytenr;
 308         u64 offset;
 309         u64 count = 0;
 310         int compress;
 311         int ret;
 312         int dev_fd;
 313         int mirror_num = 1;
 314         int num_copies;
 315
 316         compress = btrfs_file_extent_compression(leaf, fi);
 317         bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
 318         disk_size = btrfs_file_extent_disk_num_bytes(leaf, fi);
 319         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 320         offset = btrfs_file_extent_offset(leaf, fi);
 321         num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
 322         size_left = disk_size;
 323         if (compress == BTRFS_COMPRESS_NONE)
 324                 bytenr += offset;
 325
 326         if (verbose && offset)
 327                 printf("offset is %Lu\n", offset);
 328         /* we found a hole */
 329         if (disk_size == 0)
 330                 return 0;
 331
 332         inbuf = malloc(size_left);
 333         if (!inbuf) {
 334                 error("not enough memory");
 335                 return -ENOMEM;
 336         }
 337
 338         if (compress != BTRFS_COMPRESS_NONE) {
 339                 outbuf = calloc(1, ram_size);
 340                 if (!outbuf) {
 341                         error("not enough memory");
 342                         free(inbuf);
 343                         return -ENOMEM;
 344                 }
 345         }
 346 again:
 347         length = size_left;
 348         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 349                               bytenr, &length, &multi, mirror_num, NULL);
 350         if (ret) {
 351                 error("cannot map block logical %llu length %llu: %d",
 352                                 (unsigned long long)bytenr,
 353                                 (unsigned long long)length, ret);
 354                 goto out;
 355         }
 356         device = multi->stripes[0].dev;
 357         dev_fd = device->fd;
 358         device->total_ios++;
 359         dev_bytenr = multi->stripes[0].physical;
 360         free(multi);
 361
 362         if (size_left < length)
 363                 length = size_left;
 364
 365         done = pread(dev_fd, inbuf+count, length, dev_bytenr);
 366         /* Need both checks, or we miss negative values due to u64 conversion */
 367         if (done < 0 || done < length) {
 368                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 369                                               bytenr, length);
 370                 mirror_num++;
 371                 /* mirror_num is 1-indexed, so num_copies is a valid mirror. */
 372                 if (mirror_num > num_copies) {
 373                         ret = -1;
 374                         error("exhausted mirrors trying to read (%d > %d)",
 375                                         mirror_num, num_copies);
 376                         goto out;
 377                 }
 378                 fprintf(stderr, "Trying another mirror\n");
 379                 goto again;
 380         }
 381
 382         mirror_num = 1;
 383         size_left -= length;
 384         count += length;
 385         bytenr += length;
 386         if (size_left)
 387                 goto again;
 388
 389         if (compress == BTRFS_COMPRESS_NONE) {
 390                 while (total < num_bytes) {
 391                         done = pwrite(fd, inbuf+total, num_bytes-total,
 392                                       pos+total);
 393                         if (done < 0) {
 394                                 ret = -1;
 395                                 error("cannot write data: %d %s", errno, strerror(errno));
 396                                 goto out;
 397                         }
 398                         total += done;
 399                 }
 400                 ret = 0;
 401                 goto out;
 402         }
 403
 404         ret = decompress(root, inbuf, outbuf, disk_size, &ram_size, compress);
 405         if (ret) {
 406                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 407                                               bytenr, length);
 408                 mirror_num++;
 409                 if (mirror_num >= num_copies) {
 410                         ret = -1;
 411                         goto out;
 412                 }
 413                 fprintf(stderr, "Trying another mirror\n");
 414                 goto again;
 415         }
 416
 417         while (total < num_bytes) {
 418                 done = pwrite(fd, outbuf + offset + total,
 419                               num_bytes - total,
 420                               pos + total);
 421                 if (done < 0) {
 422                         ret = -1;
 423                         goto out;
 424                 }
 425                 total += done;
 426         }
 427 out:
 428         free(inbuf);
 429         free(outbuf);
 430         return ret;
 431 }
 432
 433 enum loop_response {
 434         LOOP_STOP,
 435         LOOP_CONTINUE,
 436         LOOP_DONTASK
 437 };
 438
 439 static enum loop_response ask_to_continue(const char *file)
 440 {
 441         char buf[2];
 442         char *ret;
 443
 444         printf("We seem to be looping a lot on %s, do you want to keep going "
 445                "on ? (y/N/a): ", file);
 446 again:
 447         ret = fgets(buf, 2, stdin);
 448         if (*ret == '\n' || tolower(*ret) == 'n')
 449                 return LOOP_STOP;
 450         if (tolower(*ret) == 'a')
 451                 return LOOP_DONTASK;
 452         if (tolower(*ret) != 'y') {
 453                 printf("Please enter one of 'y', 'n', or 'a': ");
 454                 goto again;
 455         }
 456
 457         return LOOP_CONTINUE;
 458 }
 459
 460
 461 static int set_file_xattrs(struct btrfs_root *root, u64 inode,
 462                            int fd, const char *file_name)
 463 {
 464         struct btrfs_key key;
 465         struct btrfs_path path;
 466         struct extent_buffer *leaf;
 467         struct btrfs_dir_item *di;
 468         u32 name_len = 0;
 469         u32 data_len = 0;
 470         u32 len = 0;
 471         u32 cur, total_len;
 472         char *name = NULL;
 473         char *data = NULL;
 474         int ret = 0;
 475
 476         btrfs_init_path(&path);
 477         key.objectid = inode;
 478         key.type = BTRFS_XATTR_ITEM_KEY;
 479         key.offset = 0;
 480         ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
 481         if (ret < 0)
 482                 goto out;
 483
 484         leaf = path.nodes[0];
 485         while (1) {
 486                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
 487                         do {
 488                                 ret = next_leaf(root, &path);
 489                                 if (ret < 0) {
 490                                         error("searching for extended attributes: %d",
 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                                 error("setting extended attribute %s on file %s: %s",
 542                                         name, file_name, strerror(errno));
 543
 544                         len = sizeof(*di) + name_len + data_len;
 545                         cur += len;
 546                         di = (struct btrfs_dir_item *)((char *)di + len);
 547                 }
 548                 path.slots[0]++;
 549         }
 550         ret = 0;
 551 out:
 552         btrfs_release_path(&path);
 553         free(name);
 554         free(data);
 555
 556         return ret;
 557 }
 558
 559 static int copy_metadata(struct btrfs_root *root, int fd,
 560                 struct btrfs_key *key)
 561 {
 562         struct btrfs_path path;
 563         struct btrfs_inode_item *inode_item;
 564         int ret;
 565
 566         btrfs_init_path(&path);
 567         ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
 568         if (ret == 0) {
 569                 struct btrfs_timespec *bts;
 570                 struct timespec times[2];
 571
 572                 inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
 573                                 struct btrfs_inode_item);
 574
 575                 ret = fchown(fd, btrfs_inode_uid(path.nodes[0], inode_item),
 576                                 btrfs_inode_gid(path.nodes[0], inode_item));
 577                 if (ret) {
 578                         error("failed to change owner: %s", strerror(errno));
 579                         goto out;
 580                 }
 581
 582                 ret = fchmod(fd, btrfs_inode_mode(path.nodes[0], inode_item));
 583                 if (ret) {
 584                         error("failed to change mode: %s", strerror(errno));
 585                         goto out;
 586                 }
 587
 588                 bts = btrfs_inode_atime(inode_item);
 589                 times[0].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 590                 times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 591
 592                 bts = btrfs_inode_mtime(inode_item);
 593                 times[1].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 594                 times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 595
 596                 ret = futimens(fd, times);
 597                 if (ret) {
 598                         error("failed to set times: %s", strerror(errno));
 599                         goto out;
 600                 }
 601         }
 602 out:
 603         btrfs_release_path(&path);
 604         return ret;
 605 }
 606
 607 static int copy_file(struct btrfs_root *root, int fd, struct btrfs_key *key,
 608                      const char *file)
 609 {
 610         struct extent_buffer *leaf;
 611         struct btrfs_path path;
 612         struct btrfs_file_extent_item *fi;
 613         struct btrfs_inode_item *inode_item;
 614         struct btrfs_timespec *bts;
 615         struct btrfs_key found_key;
 616         int ret;
 617         int extent_type;
 618         int compression;
 619         int loops = 0;
 620         u64 found_size = 0;
 621         struct timespec times[2];
 622         int times_ok = 0;
 623
 624         btrfs_init_path(&path);
 625         ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
 626         if (ret == 0) {
 627                 inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
 628                                     struct btrfs_inode_item);
 629                 found_size = btrfs_inode_size(path.nodes[0], inode_item);
 630
 631                 if (restore_metadata) {
 632                         /*
 633                          * Change the ownership and mode now, set times when
 634                          * copyout is finished.
 635                          */
 636
 637                         ret = fchown(fd, btrfs_inode_uid(path.nodes[0], inode_item),
 638                                         btrfs_inode_gid(path.nodes[0], inode_item));
 639                         if (ret && !ignore_errors)
 640                                 goto out;
 641
 642                         ret = fchmod(fd, btrfs_inode_mode(path.nodes[0], inode_item));
 643                         if (ret && !ignore_errors)
 644                                 goto out;
 645
 646                         bts = btrfs_inode_atime(inode_item);
 647                         times[0].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 648                         times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 649
 650                         bts = btrfs_inode_mtime(inode_item);
 651                         times[1].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 652                         times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 653                         times_ok = 1;
 654                 }
 655         }
 656         btrfs_release_path(&path);
 657
 658         key->offset = 0;
 659         key->type = BTRFS_EXTENT_DATA_KEY;
 660
 661         ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
 662         if (ret < 0) {
 663                 error("searching extent data returned %d", ret);
 664                 goto out;
 665         }
 666
 667         leaf = path.nodes[0];
 668         while (!leaf) {
 669                 ret = next_leaf(root, &path);
 670                 if (ret < 0) {
 671                         error("cannot get next leaf: %d", ret);
 672                         goto out;
 673                 } else if (ret > 0) {
 674                         /* No more leaves to search */
 675                         ret = 0;
 676                         goto out;
 677                 }
 678                 leaf = path.nodes[0];
 679         }
 680
 681         while (1) {
 682                 if (loops >= 0 && loops++ >= 1024) {
 683                         enum loop_response resp;
 684
 685                         resp = ask_to_continue(file);
 686                         if (resp == LOOP_STOP)
 687                                 break;
 688                         else if (resp == LOOP_CONTINUE)
 689                                 loops = 0;
 690                         else if (resp == LOOP_DONTASK)
 691                                 loops = -1;
 692                 }
 693                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
 694                         do {
 695                                 ret = next_leaf(root, &path);
 696                                 if (ret < 0) {
 697                                         fprintf(stderr, "Error searching %d\n", ret);
 698                                         goto out;
 699                                 } else if (ret) {
 700                                         /* No more leaves to search */
 701                                         btrfs_release_path(&path);
 702                                         goto set_size;
 703                                 }
 704                                 leaf = path.nodes[0];
 705                         } while (!leaf);
 706                         continue;
 707                 }
 708                 btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
 709                 if (found_key.objectid != key->objectid)
 710                         break;
 711                 if (found_key.type != key->type)
 712                         break;
 713                 fi = btrfs_item_ptr(leaf, path.slots[0],
 714                                     struct btrfs_file_extent_item);
 715                 extent_type = btrfs_file_extent_type(leaf, fi);
 716                 compression = btrfs_file_extent_compression(leaf, fi);
 717                 if (compression >= BTRFS_COMPRESS_LAST) {
 718                         warning("compression type %d not supported",
 719                                 compression);
 720                         ret = -1;
 721                         goto out;
 722                 }
 723
 724                 if (extent_type == BTRFS_FILE_EXTENT_PREALLOC)
 725                         goto next;
 726                 if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
 727                         ret = copy_one_inline(root, fd, &path, found_key.offset);
 728                         if (ret)
 729                                 goto out;
 730                 } else if (extent_type == BTRFS_FILE_EXTENT_REG) {
 731                         ret = copy_one_extent(root, fd, leaf, fi,
 732                                               found_key.offset);
 733                         if (ret)
 734                                 goto out;
 735                 } else {
 736                         warning("weird extent type %d", extent_type);
 737                 }
 738 next:
 739                 path.slots[0]++;
 740         }
 741
 742         btrfs_release_path(&path);
 743 set_size:
 744         if (found_size) {
 745                 ret = ftruncate(fd, (loff_t)found_size);
 746                 if (ret)
 747                         return ret;
 748         }
 749         if (get_xattrs) {
 750                 ret = set_file_xattrs(root, key->objectid, fd, file);
 751                 if (ret)
 752                         return ret;
 753         }
 754         if (restore_metadata && times_ok) {
 755                 ret = futimens(fd, times);
 756                 if (ret)
 757                         return ret;
 758         }
 759         return 0;
 760
 761 out:
 762         btrfs_release_path(&path);
 763         return ret;
 764 }
 765
 766 /*
 767  * returns:
 768  *  0 if the file exists and should be skipped.
 769  *  1 if the file does NOT exist
 770  *  2 if the file exists but is OK to overwrite
 771  */
 772 static int overwrite_ok(const char * path)
 773 {
 774         static int warn = 0;
 775         struct stat st;
 776         int ret;
 777
 778         /* don't be fooled by symlinks */
 779         ret = fstatat(-1, path_name, &st, AT_SYMLINK_NOFOLLOW);
 780
 781         if (!ret) {
 782                 if (overwrite)
 783                         return 2;
 784
 785                 if (verbose || !warn)
 786                         printf("Skipping existing file"
 787                                    " %s\n", path);
 788                 if (!warn)
 789                         printf("If you wish to overwrite use -o\n");
 790                 warn = 1;
 791                 return 0;
 792         }
 793         return 1;
 794 }
 795
 796 static int copy_symlink(struct btrfs_root *root, struct btrfs_key *key,
 797                      const char *file)
 798 {
 799         struct btrfs_path path;
 800         struct extent_buffer *leaf;
 801         struct btrfs_file_extent_item *extent_item;
 802         struct btrfs_inode_item *inode_item;
 803         u32 len;
 804         u32 name_offset;
 805         int ret;
 806         struct btrfs_timespec *bts;
 807         struct timespec times[2];
 808
 809         ret = overwrite_ok(path_name);
 810         if (ret == 0)
 811             return 0; /* skip this file */
 812
 813         /* symlink() can't overwrite, so unlink first */
 814         if (ret == 2) {
 815                 ret = unlink(path_name);
 816                 if (ret) {
 817                         fprintf(stderr, "failed to unlink '%s' for overwrite\n",
 818                                         path_name);
 819                         return ret;
 820                 }
 821         }
 822
 823         btrfs_init_path(&path);
 824         key->type = BTRFS_EXTENT_DATA_KEY;
 825         key->offset = 0;
 826         ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
 827         if (ret < 0)
 828                 goto out;
 829
 830         leaf = path.nodes[0];
 831         if (!leaf) {
 832                 fprintf(stderr, "Error getting leaf for symlink '%s'\n", file);
 833                 ret = -1;
 834                 goto out;
 835         }
 836
 837         extent_item = btrfs_item_ptr(leaf, path.slots[0],
 838                         struct btrfs_file_extent_item);
 839
 840         len = btrfs_file_extent_inline_item_len(leaf,
 841                         btrfs_item_nr(path.slots[0]));
 842         if (len >= PATH_MAX) {
 843                 fprintf(stderr, "Symlink '%s' target length %d is longer than PATH_MAX\n",
 844                                 fs_name, len);
 845                 ret = -1;
 846                 goto out;
 847         }
 848
 849         name_offset = (unsigned long) extent_item
 850                         + offsetof(struct btrfs_file_extent_item, disk_bytenr);
 851         read_extent_buffer(leaf, symlink_target, name_offset, len);
 852
 853         symlink_target[len] = 0;
 854
 855         if (!dry_run) {
 856                 ret = symlink(symlink_target, path_name);
 857                 if (ret < 0) {
 858                         fprintf(stderr, "Failed to restore symlink '%s': %s\n",
 859                                         path_name, strerror(errno));
 860                         goto out;
 861                 }
 862         }
 863         printf("SYMLINK: '%s' => '%s'\n", path_name, symlink_target);
 864
 865         ret = 0;
 866         if (!restore_metadata)
 867                 goto out;
 868
 869         /*
 870          * Symlink metadata operates differently than files/directories, so do
 871          * our own work here.
 872          */
 873         key->type = BTRFS_INODE_ITEM_KEY;
 874         key->offset = 0;
 875
 876         btrfs_release_path(&path);
 877
 878         ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
 879         if (ret) {
 880                 fprintf(stderr, "Failed to lookup inode for '%s'\n", file);
 881                 goto out;
 882         }
 883
 884         inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
 885                         struct btrfs_inode_item);
 886
 887         ret = fchownat(-1, file, btrfs_inode_uid(path.nodes[0], inode_item),
 888                                    btrfs_inode_gid(path.nodes[0], inode_item),
 889                                    AT_SYMLINK_NOFOLLOW);
 890         if (ret) {
 891                 fprintf(stderr, "Failed to change owner: %s\n",
 892                                 strerror(errno));
 893                 goto out;
 894         }
 895
 896         bts = btrfs_inode_atime(inode_item);
 897         times[0].tv_sec  = btrfs_timespec_sec(path.nodes[0], bts);
 898         times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 899
 900         bts = btrfs_inode_mtime(inode_item);
 901         times[1].tv_sec  = btrfs_timespec_sec(path.nodes[0], bts);
 902         times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 903
 904         ret = utimensat(-1, file, times, AT_SYMLINK_NOFOLLOW);
 905         if (ret)
 906                 fprintf(stderr, "Failed to set times: %s\n", strerror(errno));
 907 out:
 908         btrfs_release_path(&path);
 909         return ret;
 910 }
 911
 912 static int search_dir(struct btrfs_root *root, struct btrfs_key *key,
 913                       const char *output_rootdir, const char *in_dir,
 914                       const regex_t *mreg)
 915 {
 916         struct btrfs_path path;
 917         struct extent_buffer *leaf;
 918         struct btrfs_dir_item *dir_item;
 919         struct btrfs_key found_key, location;
 920         char filename[BTRFS_NAME_LEN + 1];
 921         unsigned long name_ptr;
 922         int name_len;
 923         int ret = 0;
 924         int fd;
 925         int loops = 0;
 926         u8 type;
 927
 928         btrfs_init_path(&path);
 929         key->offset = 0;
 930         key->type = BTRFS_DIR_INDEX_KEY;
 931         ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
 932         if (ret < 0) {
 933                 fprintf(stderr, "Error searching %d\n", ret);
 934                 goto out;
 935         }
 936
 937         ret = 0;
 938
 939         leaf = path.nodes[0];
 940         while (!leaf) {
 941                 if (verbose > 1)
 942                         printf("No leaf after search, looking for the next "
 943                                "leaf\n");
 944                 ret = next_leaf(root, &path);
 945                 if (ret < 0) {
 946                         fprintf(stderr, "Error getting next leaf %d\n",
 947                                 ret);
 948                         goto out;
 949                 } else if (ret > 0) {
 950                         /* No more leaves to search */
 951                         if (verbose)
 952                                 printf("Reached the end of the tree looking "
 953                                        "for the directory\n");
 954                         ret = 0;
 955                         goto out;
 956                 }
 957                 leaf = path.nodes[0];
 958         }
 959
 960         while (leaf) {
 961                 if (loops++ >= 1024) {
 962                         printf("We have looped trying to restore files in %s "
 963                                "too many times to be making progress, "
 964                                "stopping\n", in_dir);
 965                         break;
 966                 }
 967
 968                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
 969                         do {
 970                                 ret = next_leaf(root, &path);
 971                                 if (ret < 0) {
 972                                         fprintf(stderr, "Error searching %d\n",
 973                                                 ret);
 974                                         goto out;
 975                                 } else if (ret > 0) {
 976                                         /* No more leaves to search */
 977                                         if (verbose)
 978                                                 printf("Reached the end of "
 979                                                        "the tree searching the"
 980                                                        " directory\n");
 981                                         ret = 0;
 982                                         goto out;
 983                                 }
 984                                 leaf = path.nodes[0];
 985                         } while (!leaf);
 986                         continue;
 987                 }
 988                 btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
 989                 if (found_key.objectid != key->objectid) {
 990                         if (verbose > 1)
 991                                 printf("Found objectid=%Lu, key=%Lu\n",
 992                                        found_key.objectid, key->objectid);
 993                         break;
 994                 }
 995                 if (found_key.type != key->type) {
 996                         if (verbose > 1)
 997                                 printf("Found type=%u, want=%u\n",
 998                                        found_key.type, key->type);
 999                         break;
1000                 }
1001                 dir_item = btrfs_item_ptr(leaf, path.slots[0],
1002                                           struct btrfs_dir_item);
1003                 name_ptr = (unsigned long)(dir_item + 1);
1004                 name_len = btrfs_dir_name_len(leaf, dir_item);
1005                 read_extent_buffer(leaf, filename, name_ptr, name_len);
1006                 filename[name_len] = '\0';
1007                 type = btrfs_dir_type(leaf, dir_item);
1008                 btrfs_dir_item_key_to_cpu(leaf, dir_item, &location);
1009
1010                 /* full path from root of btrfs being restored */
1011                 snprintf(fs_name, PATH_MAX, "%s/%s", in_dir, filename);
1012
1013                 if (mreg && REG_NOMATCH == regexec(mreg, fs_name, 0, NULL, 0))
1014                         goto next;
1015
1016                 /* full path from system root */
1017                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, fs_name);
1018
1019                 /*
1020                  * Restore directories, files, symlinks and metadata.
1021                  */
1022                 if (type == BTRFS_FT_REG_FILE) {
1023                         if (!overwrite_ok(path_name))
1024                                 goto next;
1025
1026                         if (verbose)
1027                                 printf("Restoring %s\n", path_name);
1028                         if (dry_run)
1029                                 goto next;
1030                         fd = open(path_name, O_CREAT|O_WRONLY, 0644);
1031                         if (fd < 0) {
1032                                 fprintf(stderr, "Error creating %s: %d\n",
1033                                         path_name, errno);
1034                                 if (ignore_errors)
1035                                         goto next;
1036                                 ret = -1;
1037                                 goto out;
1038                         }
1039                         loops = 0;
1040                         ret = copy_file(root, fd, &location, path_name);
1041                         close(fd);
1042                         if (ret) {
1043                                 fprintf(stderr, "Error copying data for %s\n",
1044                                         path_name);
1045                                 if (ignore_errors)
1046                                         goto next;
1047                                 goto out;
1048                         }
1049                 } else if (type == BTRFS_FT_DIR) {
1050                         struct btrfs_root *search_root = root;
1051                         char *dir = strdup(fs_name);
1052
1053                         if (!dir) {
1054                                 fprintf(stderr, "Ran out of memory\n");
1055                                 ret = -ENOMEM;
1056                                 goto out;
1057                         }
1058
1059                         if (location.type == BTRFS_ROOT_ITEM_KEY) {
1060                                 /*
1061                                  * If we are a snapshot and this is the index
1062                                  * object to ourselves just skip it.
1063                                  */
1064                                 if (location.objectid ==
1065                                     root->root_key.objectid) {
1066                                         free(dir);
1067                                         goto next;
1068                                 }
1069
1070                                 location.offset = (u64)-1;
1071                                 search_root = btrfs_read_fs_root(root->fs_info,
1072                                                                  &location);
1073                                 if (IS_ERR(search_root)) {
1074                                         free(dir);
1075                                         fprintf(stderr, "Error reading "
1076                                                 "subvolume %s: %lu\n",
1077                                                 path_name,
1078                                                 PTR_ERR(search_root));
1079                                         if (ignore_errors)
1080                                                 goto next;
1081                                         ret = PTR_ERR(search_root);
1082                                         goto out;
1083                                 }
1084
1085                                 /*
1086                                  * A subvolume will have a key.offset of 0, a
1087                                  * snapshot will have key.offset of a transid.
1088                                  */
1089                                 if (search_root->root_key.offset != 0 &&
1090                                     get_snaps == 0) {
1091                                         free(dir);
1092                                         printf("Skipping snapshot %s\n",
1093                                                filename);
1094                                         goto next;
1095                                 }
1096                                 location.objectid = BTRFS_FIRST_FREE_OBJECTID;
1097                         }
1098
1099                         if (verbose)
1100                                 printf("Restoring %s\n", path_name);
1101
1102                         errno = 0;
1103                         if (dry_run)
1104                                 ret = 0;
1105                         else
1106                                 ret = mkdir(path_name, 0755);
1107                         if (ret && errno != EEXIST) {
1108                                 free(dir);
1109                                 fprintf(stderr, "Error mkdiring %s: %d\n",
1110                                         path_name, errno);
1111                                 if (ignore_errors)
1112                                         goto next;
1113                                 ret = -1;
1114                                 goto out;
1115                         }
1116                         loops = 0;
1117                         ret = search_dir(search_root, &location,
1118                                          output_rootdir, dir, mreg);
1119                         free(dir);
1120                         if (ret) {
1121                                 fprintf(stderr, "Error searching %s\n",
1122                                         path_name);
1123                                 if (ignore_errors)
1124                                         goto next;
1125                                 goto out;
1126                         }
1127                 } else if (type == BTRFS_FT_SYMLINK) {
1128                         if (restore_symlinks)
1129                                 ret = copy_symlink(root, &location, path_name);
1130                         if (ret < 0) {
1131                                 if (ignore_errors)
1132                                         goto next;
1133                                 btrfs_release_path(&path);
1134                                 return ret;
1135                         }
1136                 }
1137 next:
1138                 path.slots[0]++;
1139         }
1140
1141         if (restore_metadata) {
1142                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, in_dir);
1143                 fd = open(path_name, O_RDONLY);
1144                 if (fd < 0) {
1145                         fprintf(stderr, "ERROR: Failed to access %s to restore metadata\n",
1146                                         path_name);
1147                         if (!ignore_errors) {
1148                                 ret = -1;
1149                                 goto out;
1150                         }
1151                 } else {
1152                         /*
1153                          * Set owner/mode/time on the directory as well
1154                          */
1155                         key->type = BTRFS_INODE_ITEM_KEY;
1156                         ret = copy_metadata(root, fd, key);
1157                         close(fd);
1158                         if (ret && !ignore_errors)
1159                                 goto out;
1160                 }
1161         }
1162
1163         if (verbose)
1164                 printf("Done searching %s\n", in_dir);
1165 out:
1166         btrfs_release_path(&path);
1167         return ret;
1168 }
1169
1170 static int do_list_roots(struct btrfs_root *root)
1171 {
1172         struct btrfs_key key;
1173         struct btrfs_key found_key;
1174         struct btrfs_disk_key disk_key;
1175         struct btrfs_path path;
1176         struct extent_buffer *leaf;
1177         struct btrfs_root_item ri;
1178         unsigned long offset;
1179         int slot;
1180         int ret;
1181
1182         root = root->fs_info->tree_root;
1183
1184         btrfs_init_path(&path);
1185         key.offset = 0;
1186         key.objectid = 0;
1187         key.type = BTRFS_ROOT_ITEM_KEY;
1188         ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
1189         if (ret < 0) {
1190                 fprintf(stderr, "Failed to do search %d\n", ret);
1191                 btrfs_release_path(&path);
1192                 return -1;
1193         }
1194
1195         leaf = path.nodes[0];
1196
1197         while (1) {
1198                 slot = path.slots[0];
1199                 if (slot >= btrfs_header_nritems(leaf)) {
1200                         ret = btrfs_next_leaf(root, &path);
1201                         if (ret)
1202                                 break;
1203                         leaf = path.nodes[0];
1204                         slot = path.slots[0];
1205                 }
1206                 btrfs_item_key(leaf, &disk_key, slot);
1207                 btrfs_disk_key_to_cpu(&found_key, &disk_key);
1208                 if (found_key.type != BTRFS_ROOT_ITEM_KEY) {
1209                         path.slots[0]++;
1210                         continue;
1211                 }
1212
1213                 offset = btrfs_item_ptr_offset(leaf, slot);
1214                 read_extent_buffer(leaf, &ri, offset, sizeof(ri));
1215                 printf(" tree ");
1216                 btrfs_print_key(&disk_key);
1217                 printf(" %Lu level %d\n", btrfs_root_bytenr(&ri),
1218                        btrfs_root_level(&ri));
1219                 path.slots[0]++;
1220         }
1221         btrfs_release_path(&path);
1222
1223         return 0;
1224 }
1225
1226 static struct btrfs_root *open_fs(const char *dev, u64 root_location,
1227                                   int super_mirror, int list_roots)
1228 {
1229         struct btrfs_fs_info *fs_info = NULL;
1230         struct btrfs_root *root = NULL;
1231         u64 bytenr;
1232         int i;
1233
1234         for (i = super_mirror; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1235                 bytenr = btrfs_sb_offset(i);
1236                 fs_info = open_ctree_fs_info(dev, bytenr, root_location, 0,
1237                                              OPEN_CTREE_PARTIAL);
1238                 if (fs_info)
1239                         break;
1240                 fprintf(stderr, "Could not open root, trying backup super\n");
1241         }
1242
1243         if (!fs_info)
1244                 return NULL;
1245
1246         /*
1247          * All we really need to succeed is reading the chunk tree, everything
1248          * else we can do by hand, since we only need to read the tree root and
1249          * the fs_root.
1250          */
1251         if (!extent_buffer_uptodate(fs_info->tree_root->node)) {
1252                 u64 generation;
1253
1254                 root = fs_info->tree_root;
1255                 if (!root_location)
1256                         root_location = btrfs_super_root(fs_info->super_copy);
1257                 generation = btrfs_super_generation(fs_info->super_copy);
1258                 root->node = read_tree_block(root, root_location,
1259                                              root->nodesize, generation);
1260                 if (!extent_buffer_uptodate(root->node)) {
1261                         fprintf(stderr, "Error opening tree root\n");
1262                         close_ctree(root);
1263                         return NULL;
1264                 }
1265         }
1266
1267         if (!list_roots && !fs_info->fs_root) {
1268                 struct btrfs_key key;
1269
1270                 key.objectid = BTRFS_FS_TREE_OBJECTID;
1271                 key.type = BTRFS_ROOT_ITEM_KEY;
1272                 key.offset = (u64)-1;
1273                 fs_info->fs_root = btrfs_read_fs_root_no_cache(fs_info, &key);
1274                 if (IS_ERR(fs_info->fs_root)) {
1275                         fprintf(stderr, "Couldn't read fs root: %ld\n",
1276                                 PTR_ERR(fs_info->fs_root));
1277                         close_ctree(fs_info->tree_root);
1278                         return NULL;
1279                 }
1280         }
1281
1282         if (list_roots && do_list_roots(fs_info->tree_root)) {
1283                 close_ctree(fs_info->tree_root);
1284                 return NULL;
1285         }
1286
1287         return fs_info->fs_root;
1288 }
1289
1290 static int find_first_dir(struct btrfs_root *root, u64 *objectid)
1291 {
1292         struct btrfs_path path;
1293         struct btrfs_key found_key;
1294         struct btrfs_key key;
1295         int ret = -1;
1296         int i;
1297
1298         btrfs_init_path(&path);
1299         key.objectid = 0;
1300         key.type = BTRFS_DIR_INDEX_KEY;
1301         key.offset = 0;
1302         ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
1303         if (ret < 0) {
1304                 fprintf(stderr, "Error searching %d\n", ret);
1305                 goto out;
1306         }
1307
1308         if (!path.nodes[0]) {
1309                 fprintf(stderr, "No leaf!\n");
1310                 goto out;
1311         }
1312 again:
1313         for (i = path.slots[0];
1314              i < btrfs_header_nritems(path.nodes[0]); i++) {
1315                 btrfs_item_key_to_cpu(path.nodes[0], &found_key, i);
1316                 if (found_key.type != key.type)
1317                         continue;
1318
1319                 printf("Using objectid %Lu for first dir\n",
1320                        found_key.objectid);
1321                 *objectid = found_key.objectid;
1322                 ret = 0;
1323                 goto out;
1324         }
1325         do {
1326                 ret = next_leaf(root, &path);
1327                 if (ret < 0) {
1328                         fprintf(stderr, "Error getting next leaf %d\n",
1329                                 ret);
1330                         goto out;
1331                 } else if (ret > 0) {
1332                         fprintf(stderr, "No more leaves\n");
1333                         goto out;
1334                 }
1335         } while (!path.nodes[0]);
1336         if (path.nodes[0])
1337                 goto again;
1338         printf("Couldn't find a dir index item\n");
1339 out:
1340         btrfs_release_path(&path);
1341         return ret;
1342 }
1343
1344 const char * const cmd_restore_usage[] = {
1345         "btrfs restore [options] <device> <path> | -l <device>",
1346         "Try to restore files from a damaged filesystem (unmounted)",
1347         "",
1348         "-s|--snapshots       get snapshots",
1349         "-x|--xattr           restore extended attributes",
1350         "-m|--metadata        restore owner, mode and times",
1351         "-S|--symlink         restore symbolic links",
1352         "-v|--verbose         verbose",
1353         "-i|--ignore-errors   ignore errors",
1354         "-o|--overwrite       overwrite",
1355         "-t <bytenr>          tree location",
1356         "-f <bytenr>          filesystem location",
1357         "-u|--super <mirror>  super mirror",
1358         "-r|--root <rootid>   root objectid",
1359         "-d                   find dir",
1360         "-l|--list-roots      list tree roots",
1361         "-D|--dry-run         dry run (only list files that would be recovered)",
1362         "--path-regex <regex>",
1363         "                     restore only filenames matching regex,",
1364         "                     you have to use following syntax (possibly quoted):",
1365         "                     ^/(|home(|/username(|/Desktop(|/.*))))$",
1366         "-c                   ignore case (--path-regex only)",
1367         NULL
1368 };
1369
1370 int cmd_restore(int argc, char **argv)
1371 {
1372         struct btrfs_root *root;
1373         struct btrfs_key key;
1374         char dir_name[PATH_MAX];
1375         u64 tree_location = 0;
1376         u64 fs_location = 0;
1377         u64 root_objectid = 0;
1378         int len;
1379         int ret;
1380         int super_mirror = 0;
1381         int find_dir = 0;
1382         int list_roots = 0;
1383         const char *match_regstr = NULL;
1384         int match_cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
1385         regex_t match_reg, *mreg = NULL;
1386         char reg_err[256];
1387
1388         while (1) {
1389                 int opt;
1390                 enum { GETOPT_VAL_PATH_REGEX = 256 };
1391                 static const struct option long_options[] = {
1392                         { "path-regex", required_argument, NULL,
1393                                 GETOPT_VAL_PATH_REGEX },
1394                         { "dry-run", no_argument, NULL, 'D'},
1395                         { "metadata", no_argument, NULL, 'm'},
1396                         { "symlinks", no_argument, NULL, 'S'},
1397                         { "snapshots", no_argument, NULL, 's'},
1398                         { "xattr", no_argument, NULL, 'x'},
1399                         { "verbose", no_argument, NULL, 'v'},
1400                         { "ignore-errors", no_argument, NULL, 'i'},
1401                         { "overwrite", no_argument, NULL, 'o'},
1402                         { "super", required_argument, NULL, 'u'},
1403                         { "root", required_argument, NULL, 'r'},
1404                         { "list-roots", no_argument, NULL, 'l'},
1405                         { NULL, 0, NULL, 0}
1406                 };
1407
1408                 opt = getopt_long(argc, argv, "sSxviot:u:dmf:r:lDc", long_options,
1409                                         NULL);
1410                 if (opt < 0)
1411                         break;
1412
1413                 switch (opt) {
1414                         case 's':
1415                                 get_snaps = 1;
1416                                 break;
1417                         case 'v':
1418                                 verbose++;
1419                                 break;
1420                         case 'i':
1421                                 ignore_errors = 1;
1422                                 break;
1423                         case 'o':
1424                                 overwrite = 1;
1425                                 break;
1426                         case 't':
1427                                 tree_location = arg_strtou64(optarg);
1428                                 break;
1429                         case 'f':
1430                                 fs_location = arg_strtou64(optarg);
1431                                 break;
1432                         case 'u':
1433                                 super_mirror = arg_strtou64(optarg);
1434                                 if (super_mirror >= BTRFS_SUPER_MIRROR_MAX) {
1435                                         fprintf(stderr, "Super mirror not "
1436                                                 "valid\n");
1437                                         exit(1);
1438                                 }
1439                                 break;
1440                         case 'd':
1441                                 find_dir = 1;
1442                                 break;
1443                         case 'r':
1444                                 root_objectid = arg_strtou64(optarg);
1445                                 if (!is_fstree(root_objectid)) {
1446                                         fprintf(stderr, "objectid %llu is not a valid fs/file tree\n",
1447                                                         root_objectid);
1448                                         exit(1);
1449                                 }
1450                                 break;
1451                         case 'l':
1452                                 list_roots = 1;
1453                                 break;
1454                         case 'm':
1455                                 restore_metadata = 1;
1456                                 break;
1457                         case 'S':
1458                                 restore_symlinks = 1;
1459                                 break;
1460                         case 'D':
1461                                 dry_run = 1;
1462                                 break;
1463                         case 'c':
1464                                 match_cflags |= REG_ICASE;
1465                                 break;
1466                         case GETOPT_VAL_PATH_REGEX:
1467                                 match_regstr = optarg;
1468                                 break;
1469                         case 'x':
1470                                 get_xattrs = 1;
1471                                 break;
1472                         default:
1473                                 usage(cmd_restore_usage);
1474                 }
1475         }
1476
1477         if (!list_roots && check_argc_min(argc - optind, 2))
1478                 usage(cmd_restore_usage);
1479         else if (list_roots && check_argc_min(argc - optind, 1))
1480                 usage(cmd_restore_usage);
1481
1482         if (fs_location && root_objectid) {
1483                 fprintf(stderr, "don't use -f and -r at the same time.\n");
1484                 return 1;
1485         }
1486
1487         if ((ret = check_mounted(argv[optind])) < 0) {
1488                 fprintf(stderr, "Could not check mount status: %s\n",
1489                         strerror(-ret));
1490                 return 1;
1491         } else if (ret) {
1492                 fprintf(stderr, "%s is currently mounted.  Aborting.\n", argv[optind]);
1493                 return 1;
1494         }
1495
1496         root = open_fs(argv[optind], tree_location, super_mirror, list_roots);
1497         if (root == NULL)
1498                 return 1;
1499
1500         if (list_roots)
1501                 goto out;
1502
1503         if (fs_location != 0) {
1504                 free_extent_buffer(root->node);
1505                 root->node = read_tree_block(root, fs_location, root->nodesize, 0);
1506                 if (!extent_buffer_uptodate(root->node)) {
1507                         fprintf(stderr, "Failed to read fs location\n");
1508                         ret = 1;
1509                         goto out;
1510                 }
1511         }
1512
1513         memset(path_name, 0, PATH_MAX);
1514
1515         if (strlen(argv[optind + 1]) >= PATH_MAX) {
1516                 fprintf(stderr, "ERROR: path too long\n");
1517                 ret = 1;
1518                 goto out;
1519         }
1520         strncpy(dir_name, argv[optind + 1], sizeof dir_name);
1521         dir_name[sizeof dir_name - 1] = 0;
1522
1523         /* Strip the trailing / on the dir name */
1524         len = strlen(dir_name);
1525         while (len && dir_name[--len] == '/') {
1526                 dir_name[len] = '\0';
1527         }
1528
1529         if (root_objectid != 0) {
1530                 struct btrfs_root *orig_root = root;
1531
1532                 key.objectid = root_objectid;
1533                 key.type = BTRFS_ROOT_ITEM_KEY;
1534                 key.offset = (u64)-1;
1535                 root = btrfs_read_fs_root(orig_root->fs_info, &key);
1536                 if (IS_ERR(root)) {
1537                         fprintf(stderr, "fail to read root %llu: %s\n",
1538                                         root_objectid, strerror(-PTR_ERR(root)));
1539                         root = orig_root;
1540                         ret = 1;
1541                         goto out;
1542                 }
1543                 key.type = 0;
1544                 key.offset = 0;
1545         }
1546
1547         if (find_dir) {
1548                 ret = find_first_dir(root, &key.objectid);
1549                 if (ret)
1550                         goto out;
1551         } else {
1552                 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
1553         }
1554
1555         if (match_regstr) {
1556                 ret = regcomp(&match_reg, match_regstr, match_cflags);
1557                 if (ret) {
1558                         regerror(ret, &match_reg, reg_err, sizeof(reg_err));
1559                         fprintf(stderr, "Regex compile failed: %s\n", reg_err);
1560                         goto out;
1561                 }
1562                 mreg = &match_reg;
1563         }
1564
1565         if (dry_run)
1566                 printf("This is a dry-run, no files are going to be restored\n");
1567
1568         ret = search_dir(root, &key, dir_name, "", mreg);
1569
1570 out:
1571         if (mreg)
1572                 regfree(mreg);
1573         close_ctree(root);
1574         return !!ret;
1575 }