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 char symlink_target[PATH_MAX];
  49 static int get_snaps = 0;
  50 static int verbose = 0;
  51 static int restore_metadata = 0;
  52 static int restore_symlinks = 0;
  53 static int ignore_errors = 0;
  54 static int overwrite = 0;
  55 static int get_xattrs = 0;
  56 static int dry_run = 0;
  57
  58 #define LZO_LEN 4
  59 #define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3)
  60
  61 static int decompress_zlib(char *inbuf, char *outbuf, u64 compress_len,
  62                            u64 decompress_len)
  63 {
  64         z_stream strm;
  65         int ret;
  66
  67         memset(&strm, 0, sizeof(strm));
  68         ret = inflateInit(&strm);
  69         if (ret != Z_OK) {
  70                 error("zlib init returned %d", ret);
  71                 return -1;
  72         }
  73
  74         strm.avail_in = compress_len;
  75         strm.next_in = (unsigned char *)inbuf;
  76         strm.avail_out = decompress_len;
  77         strm.next_out = (unsigned char *)outbuf;
  78         ret = inflate(&strm, Z_NO_FLUSH);
  79         if (ret != Z_STREAM_END) {
  80                 (void)inflateEnd(&strm);
  81                 error("zlib inflate failed: %d", ret);
  82                 return -1;
  83         }
  84
  85         (void)inflateEnd(&strm);
  86         return 0;
  87 }
  88 static inline size_t read_compress_length(unsigned char *buf)
  89 {
  90         __le32 dlen;
  91         memcpy(&dlen, buf, LZO_LEN);
  92         return le32_to_cpu(dlen);
  93 }
  94
  95 static int decompress_lzo(struct btrfs_root *root, unsigned char *inbuf,
  96                         char *outbuf, u64 compress_len, u64 *decompress_len)
  97 {
  98         size_t new_len;
  99         size_t in_len;
 100         size_t out_len = 0;
 101         size_t tot_len;
 102         size_t tot_in;
 103         int ret;
 104
 105         ret = lzo_init();
 106         if (ret != LZO_E_OK) {
 107                 error("lzo init returned %d", ret);
 108                 return -1;
 109         }
 110
 111         tot_len = read_compress_length(inbuf);
 112         inbuf += LZO_LEN;
 113         tot_in = LZO_LEN;
 114
 115         while (tot_in < tot_len) {
 116                 size_t mod_page;
 117                 size_t rem_page;
 118                 in_len = read_compress_length(inbuf);
 119
 120                 if ((tot_in + LZO_LEN + in_len) > tot_len) {
 121                         error("bad compress length %lu",
 122                                 (unsigned long)in_len);
 123                         return -1;
 124                 }
 125
 126                 inbuf += LZO_LEN;
 127                 tot_in += LZO_LEN;
 128                 new_len = lzo1x_worst_compress(root->sectorsize);
 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                         error("lzo decompress failed: %d", 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 % root->sectorsize;
 146                 rem_page = root->sectorsize - 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(struct btrfs_root *root, char *inbuf, char *outbuf,
 159                         u64 compress_len, 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(root, (unsigned char *)inbuf, outbuf,
 167                                         compress_len, decompress_len);
 168         default:
 169                 break;
 170         }
 171
 172         error("invalid compression type: %d", 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(struct btrfs_root *root, int fd,
 236                                 struct btrfs_path *path, u64 pos)
 237 {
 238         struct extent_buffer *leaf = path->nodes[0];
 239         struct btrfs_file_extent_item *fi;
 240         char buf[4096];
 241         char *outbuf;
 242         u64 ram_size;
 243         ssize_t done;
 244         unsigned long ptr;
 245         int ret;
 246         int len;
 247         int inline_item_len;
 248         int compress;
 249
 250         fi = btrfs_item_ptr(leaf, path->slots[0],
 251                             struct btrfs_file_extent_item);
 252         ptr = btrfs_file_extent_inline_start(fi);
 253         len = btrfs_file_extent_inline_len(leaf, path->slots[0], fi);
 254         inline_item_len = btrfs_file_extent_inline_item_len(leaf, btrfs_item_nr(path->slots[0]));
 255         read_extent_buffer(leaf, buf, ptr, inline_item_len);
 256
 257         compress = btrfs_file_extent_compression(leaf, fi);
 258         if (compress == BTRFS_COMPRESS_NONE) {
 259                 done = pwrite(fd, buf, len, pos);
 260                 if (done < len) {
 261                         fprintf(stderr, "Short inline write, wanted %d, did "
 262                                 "%zd: %d\n", len, done, errno);
 263                         return -1;
 264                 }
 265                 return 0;
 266         }
 267
 268         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 269         outbuf = calloc(1, ram_size);
 270         if (!outbuf) {
 271                 error("not enough memory");
 272                 return -ENOMEM;
 273         }
 274
 275         ret = decompress(root, buf, outbuf, len, &ram_size, compress);
 276         if (ret) {
 277                 free(outbuf);
 278                 return ret;
 279         }
 280
 281         done = pwrite(fd, outbuf, ram_size, pos);
 282         free(outbuf);
 283         if (done < ram_size) {
 284                 fprintf(stderr, "Short compressed inline write, wanted %Lu, "
 285                         "did %zd: %d\n", ram_size, done, errno);
 286                 return -1;
 287         }
 288
 289         return 0;
 290 }
 291
 292 static int copy_one_extent(struct btrfs_root *root, int fd,
 293                            struct extent_buffer *leaf,
 294                            struct btrfs_file_extent_item *fi, u64 pos)
 295 {
 296         struct btrfs_multi_bio *multi = NULL;
 297         struct btrfs_device *device;
 298         char *inbuf, *outbuf = NULL;
 299         ssize_t done, total = 0;
 300         u64 bytenr;
 301         u64 ram_size;
 302         u64 disk_size;
 303         u64 num_bytes;
 304         u64 length;
 305         u64 size_left;
 306         u64 dev_bytenr;
 307         u64 offset;
 308         u64 count = 0;
 309         int compress;
 310         int ret;
 311         int dev_fd;
 312         int mirror_num = 1;
 313         int num_copies;
 314
 315         compress = btrfs_file_extent_compression(leaf, fi);
 316         bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
 317         disk_size = btrfs_file_extent_disk_num_bytes(leaf, fi);
 318         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 319         offset = btrfs_file_extent_offset(leaf, fi);
 320         num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
 321         size_left = disk_size;
 322         if (compress == BTRFS_COMPRESS_NONE)
 323                 bytenr += offset;
 324
 325         if (verbose && offset)
 326                 printf("offset is %Lu\n", offset);
 327         /* we found a hole */
 328         if (disk_size == 0)
 329                 return 0;
 330
 331         inbuf = malloc(size_left);
 332         if (!inbuf) {
 333                 error("not enough memory\n");
 334                 return -ENOMEM;
 335         }
 336
 337         if (compress != BTRFS_COMPRESS_NONE) {
 338                 outbuf = calloc(1, ram_size);
 339                 if (!outbuf) {
 340                         error("not enough memory");
 341                         free(inbuf);
 342                         return -ENOMEM;
 343                 }
 344         }
 345 again:
 346         length = size_left;
 347         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 348                               bytenr, &length, &multi, mirror_num, NULL);
 349         if (ret) {
 350                 error("cannot map block logical %llu length %llu: %d",
 351                                 (unsigned long long)bytenr,
 352                                 (unsigned long long)length, ret);
 353                 goto out;
 354         }
 355         device = multi->stripes[0].dev;
 356         dev_fd = device->fd;
 357         device->total_ios++;
 358         dev_bytenr = multi->stripes[0].physical;
 359         free(multi);
 360
 361         if (size_left < length)
 362                 length = size_left;
 363
 364         done = pread(dev_fd, inbuf+count, length, dev_bytenr);
 365         /* Need both checks, or we miss negative values due to u64 conversion */
 366         if (done < 0 || done < length) {
 367                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 368                                               bytenr, length);
 369                 mirror_num++;
 370                 /* mirror_num is 1-indexed, so num_copies is a valid mirror. */
 371                 if (mirror_num > num_copies) {
 372                         ret = -1;
 373                         error("exhausted mirrors trying to read (%d > %d)",
 374                                         mirror_num, num_copies);
 375                         goto out;
 376                 }
 377                 fprintf(stderr, "Trying another mirror\n");
 378                 goto again;
 379         }
 380
 381         mirror_num = 1;
 382         size_left -= length;
 383         count += length;
 384         bytenr += length;
 385         if (size_left)
 386                 goto again;
 387
 388         if (compress == BTRFS_COMPRESS_NONE) {
 389                 while (total < num_bytes) {
 390                         done = pwrite(fd, inbuf+total, num_bytes-total,
 391                                       pos+total);
 392                         if (done < 0) {
 393                                 ret = -1;
 394                                 error("cannot write data: %d %s", errno, strerror(errno));
 395                                 goto out;
 396                         }
 397                         total += done;
 398                 }
 399                 ret = 0;
 400                 goto out;
 401         }
 402
 403         ret = decompress(root, inbuf, outbuf, disk_size, &ram_size, compress);
 404         if (ret) {
 405                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 406                                               bytenr, length);
 407                 mirror_num++;
 408                 if (mirror_num >= num_copies) {
 409                         ret = -1;
 410                         goto out;
 411                 }
 412                 fprintf(stderr, "Trying another mirror\n");
 413                 goto again;
 414         }
 415
 416         while (total < num_bytes) {
 417                 done = pwrite(fd, outbuf + offset + total,
 418                               num_bytes - total,
 419                               pos + total);
 420                 if (done < 0) {
 421                         ret = -1;
 422                         goto out;
 423                 }
 424                 total += done;
 425         }
 426 out:
 427         free(inbuf);
 428         free(outbuf);
 429         return ret;
 430 }
 431
 432 enum loop_response {
 433         LOOP_STOP,
 434         LOOP_CONTINUE,
 435         LOOP_DONTASK
 436 };
 437
 438 static enum loop_response ask_to_continue(const char *file)
 439 {
 440         char buf[2];
 441         char *ret;
 442
 443         printf("We seem to be looping a lot on %s, do you want to keep going "
 444                "on ? (y/N/a): ", file);
 445 again:
 446         ret = fgets(buf, 2, stdin);
 447         if (*ret == '\n' || tolower(*ret) == 'n')
 448                 return LOOP_STOP;
 449         if (tolower(*ret) == 'a')
 450                 return LOOP_DONTASK;
 451         if (tolower(*ret) != 'y') {
 452                 printf("Please enter one of 'y', 'n', or 'a': ");
 453                 goto again;
 454         }
 455
 456         return LOOP_CONTINUE;
 457 }
 458
 459
 460 static int set_file_xattrs(struct btrfs_root *root, u64 inode,
 461                            int fd, const char *file_name)
 462 {
 463         struct btrfs_key key;
 464         struct btrfs_path path;
 465         struct extent_buffer *leaf;
 466         struct btrfs_dir_item *di;
 467         u32 name_len = 0;
 468         u32 data_len = 0;
 469         u32 len = 0;
 470         u32 cur, total_len;
 471         char *name = NULL;
 472         char *data = NULL;
 473         int ret = 0;
 474
 475         btrfs_init_path(&path);
 476         key.objectid = inode;
 477         key.type = BTRFS_XATTR_ITEM_KEY;
 478         key.offset = 0;
 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                                         error("searching for extended attributes: %d\n",
 490                                                 ret);
 491                                         goto out;
 492                                 } else if (ret) {
 493                                         /* No more leaves to search */
 494                                         ret = 0;
 495                                         goto out;
 496                                 }
 497                                 leaf = path.nodes[0];
 498                         } while (!leaf);
 499                         continue;
 500                 }
 501
 502                 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
 503                 if (key.type != BTRFS_XATTR_ITEM_KEY || key.objectid != inode)
 504                         break;
 505                 cur = 0;
 506                 total_len = btrfs_item_size_nr(leaf, path.slots[0]);
 507                 di = btrfs_item_ptr(leaf, path.slots[0],
 508                                     struct btrfs_dir_item);
 509
 510                 while (cur < total_len) {
 511                         len = btrfs_dir_name_len(leaf, di);
 512                         if (len > name_len) {
 513                                 free(name);
 514                                 name = (char *) malloc(len + 1);
 515                                 if (!name) {
 516                                         ret = -ENOMEM;
 517                                         goto out;
 518                                 }
 519                         }
 520                         read_extent_buffer(leaf, name,
 521                                            (unsigned long)(di + 1), len);
 522                         name[len] = '\0';
 523                         name_len = len;
 524
 525                         len = btrfs_dir_data_len(leaf, di);
 526                         if (len > data_len) {
 527                                 free(data);
 528                                 data = (char *) malloc(len);
 529                                 if (!data) {
 530                                         ret = -ENOMEM;
 531                                         goto out;
 532                                 }
 533                         }
 534                         read_extent_buffer(leaf, data,
 535                                            (unsigned long)(di + 1) + name_len,
 536                                            len);
 537                         data_len = len;
 538
 539                         if (fsetxattr(fd, name, data, data_len, 0))
 540                                 error("setting extended attribute %s on file %s: %s",
 541                                         name, file_name, strerror(errno));
 542
 543                         len = sizeof(*di) + name_len + data_len;
 544                         cur += len;
 545                         di = (struct btrfs_dir_item *)((char *)di + len);
 546                 }
 547                 path.slots[0]++;
 548         }
 549         ret = 0;
 550 out:
 551         btrfs_release_path(&path);
 552         free(name);
 553         free(data);
 554
 555         return ret;
 556 }
 557
 558 static int copy_metadata(struct btrfs_root *root, int fd,
 559                 struct btrfs_key *key)
 560 {
 561         struct btrfs_path path;
 562         struct btrfs_inode_item *inode_item;
 563         int ret;
 564
 565         btrfs_init_path(&path);
 566         ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
 567         if (ret == 0) {
 568                 struct btrfs_timespec *bts;
 569                 struct timespec times[2];
 570
 571                 inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
 572                                 struct btrfs_inode_item);
 573
 574                 ret = fchown(fd, btrfs_inode_uid(path.nodes[0], inode_item),
 575                                 btrfs_inode_gid(path.nodes[0], inode_item));
 576                 if (ret) {
 577                         error("failed to change owner: %s", strerror(errno));
 578                         goto out;
 579                 }
 580
 581                 ret = fchmod(fd, btrfs_inode_mode(path.nodes[0], inode_item));
 582                 if (ret) {
 583                         error("failed to change mode: %s", strerror(errno));
 584                         goto out;
 585                 }
 586
 587                 bts = btrfs_inode_atime(inode_item);
 588                 times[0].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 589                 times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 590
 591                 bts = btrfs_inode_mtime(inode_item);
 592                 times[1].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 593                 times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 594
 595                 ret = futimens(fd, times);
 596                 if (ret) {
 597                         error("failed to set times: %s", strerror(errno));
 598                         goto out;
 599                 }
 600         }
 601 out:
 602         btrfs_release_path(&path);
 603         return ret;
 604 }
 605
 606 static int copy_file(struct btrfs_root *root, int fd, struct btrfs_key *key,
 607                      const char *file)
 608 {
 609         struct extent_buffer *leaf;
 610         struct btrfs_path path;
 611         struct btrfs_file_extent_item *fi;
 612         struct btrfs_inode_item *inode_item;
 613         struct btrfs_timespec *bts;
 614         struct btrfs_key found_key;
 615         int ret;
 616         int extent_type;
 617         int compression;
 618         int loops = 0;
 619         u64 found_size = 0;
 620         struct timespec times[2];
 621         int times_ok = 0;
 622
 623         btrfs_init_path(&path);
 624         ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
 625         if (ret == 0) {
 626                 inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
 627                                     struct btrfs_inode_item);
 628                 found_size = btrfs_inode_size(path.nodes[0], inode_item);
 629
 630                 if (restore_metadata) {
 631                         /*
 632                          * Change the ownership and mode now, set times when
 633                          * copyout is finished.
 634                          */
 635
 636                         ret = fchown(fd, btrfs_inode_uid(path.nodes[0], inode_item),
 637                                         btrfs_inode_gid(path.nodes[0], inode_item));
 638                         if (ret && !ignore_errors)
 639                                 goto out;
 640
 641                         ret = fchmod(fd, btrfs_inode_mode(path.nodes[0], inode_item));
 642                         if (ret && !ignore_errors)
 643                                 goto out;
 644
 645                         bts = btrfs_inode_atime(inode_item);
 646                         times[0].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 647                         times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 648
 649                         bts = btrfs_inode_mtime(inode_item);
 650                         times[1].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 651                         times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 652                         times_ok = 1;
 653                 }
 654         }
 655         btrfs_release_path(&path);
 656
 657         key->offset = 0;
 658         key->type = BTRFS_EXTENT_DATA_KEY;
 659
 660         ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
 661         if (ret < 0) {
 662                 error("searching extent data returned %d", ret);
 663                 goto out;
 664         }
 665
 666         leaf = path.nodes[0];
 667         while (!leaf) {
 668                 ret = next_leaf(root, &path);
 669                 if (ret < 0) {
 670                         error("cannot get next leaf: %d", ret);
 671                         goto out;
 672                 } else if (ret > 0) {
 673                         /* No more leaves to search */
 674                         ret = 0;
 675                         goto out;
 676                 }
 677                 leaf = path.nodes[0];
 678         }
 679
 680         while (1) {
 681                 if (loops >= 0 && loops++ >= 1024) {
 682                         enum loop_response resp;
 683
 684                         resp = ask_to_continue(file);
 685                         if (resp == LOOP_STOP)
 686                                 break;
 687                         else if (resp == LOOP_CONTINUE)
 688                                 loops = 0;
 689                         else if (resp == LOOP_DONTASK)
 690                                 loops = -1;
 691                 }
 692                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
 693                         do {
 694                                 ret = next_leaf(root, &path);
 695                                 if (ret < 0) {
 696                                         fprintf(stderr, "Error searching %d\n", ret);
 697                                         goto out;
 698                                 } else if (ret) {
 699                                         /* No more leaves to search */
 700                                         btrfs_release_path(&path);
 701                                         goto set_size;
 702                                 }
 703                                 leaf = path.nodes[0];
 704                         } while (!leaf);
 705                         continue;
 706                 }
 707                 btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
 708                 if (found_key.objectid != key->objectid)
 709                         break;
 710                 if (found_key.type != key->type)
 711                         break;
 712                 fi = btrfs_item_ptr(leaf, path.slots[0],
 713                                     struct btrfs_file_extent_item);
 714                 extent_type = btrfs_file_extent_type(leaf, fi);
 715                 compression = btrfs_file_extent_compression(leaf, fi);
 716                 if (compression >= BTRFS_COMPRESS_LAST) {
 717                         warning("compression type %d not supported",
 718                                 compression);
 719                         ret = -1;
 720                         goto out;
 721                 }
 722
 723                 if (extent_type == BTRFS_FILE_EXTENT_PREALLOC)
 724                         goto next;
 725                 if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
 726                         ret = copy_one_inline(root, fd, &path, found_key.offset);
 727                         if (ret)
 728                                 goto out;
 729                 } else if (extent_type == BTRFS_FILE_EXTENT_REG) {
 730                         ret = copy_one_extent(root, fd, leaf, fi,
 731                                               found_key.offset);
 732                         if (ret)
 733                                 goto out;
 734                 } else {
 735                         warning("weird extent type %d", extent_type);
 736                 }
 737 next:
 738                 path.slots[0]++;
 739         }
 740
 741         btrfs_release_path(&path);
 742 set_size:
 743         if (found_size) {
 744                 ret = ftruncate(fd, (loff_t)found_size);
 745                 if (ret)
 746                         return ret;
 747         }
 748         if (get_xattrs) {
 749                 ret = set_file_xattrs(root, key->objectid, fd, file);
 750                 if (ret)
 751                         return ret;
 752         }
 753         if (restore_metadata && times_ok) {
 754                 ret = futimens(fd, times);
 755                 if (ret)
 756                         return ret;
 757         }
 758         return 0;
 759
 760 out:
 761         btrfs_release_path(&path);
 762         return ret;
 763 }
 764
 765 /*
 766  * returns:
 767  *  0 if the file exists and should be skipped.
 768  *  1 if the file does NOT exist
 769  *  2 if the file exists but is OK to overwrite
 770  */
 771 static int overwrite_ok(const char * path)
 772 {
 773         static int warn = 0;
 774         struct stat st;
 775         int ret;
 776
 777         /* don't be fooled by symlinks */
 778         ret = fstatat(-1, path_name, &st, AT_SYMLINK_NOFOLLOW);
 779
 780         if (!ret) {
 781                 if (overwrite)
 782                         return 2;
 783
 784                 if (verbose || !warn)
 785                         printf("Skipping existing file"
 786                                    " %s\n", path);
 787                 if (!warn)
 788                         printf("If you wish to overwrite use -o\n");
 789                 warn = 1;
 790                 return 0;
 791         }
 792         return 1;
 793 }
 794
 795 static int copy_symlink(struct btrfs_root *root, struct btrfs_key *key,
 796                      const char *file)
 797 {
 798         struct btrfs_path path;
 799         struct extent_buffer *leaf;
 800         struct btrfs_file_extent_item *extent_item;
 801         struct btrfs_inode_item *inode_item;
 802         u32 len;
 803         u32 name_offset;
 804         int ret;
 805         struct btrfs_timespec *bts;
 806         struct timespec times[2];
 807
 808         ret = overwrite_ok(path_name);
 809         if (ret == 0)
 810             return 0; /* skip this file */
 811
 812         /* symlink() can't overwrite, so unlink first */
 813         if (ret == 2) {
 814                 ret = unlink(path_name);
 815                 if (ret) {
 816                         fprintf(stderr, "failed to unlink '%s' for overwrite\n",
 817                                         path_name);
 818                         return ret;
 819                 }
 820         }
 821
 822         btrfs_init_path(&path);
 823         key->type = BTRFS_EXTENT_DATA_KEY;
 824         key->offset = 0;
 825         ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
 826         if (ret < 0)
 827                 goto out;
 828
 829         leaf = path.nodes[0];
 830         if (!leaf) {
 831                 fprintf(stderr, "Error getting leaf for symlink '%s'\n", file);
 832                 ret = -1;
 833                 goto out;
 834         }
 835
 836         extent_item = btrfs_item_ptr(leaf, path.slots[0],
 837                         struct btrfs_file_extent_item);
 838
 839         len = btrfs_file_extent_inline_item_len(leaf,
 840                         btrfs_item_nr(path.slots[0]));
 841         if (len >= PATH_MAX) {
 842                 fprintf(stderr, "Symlink '%s' target length %d is longer than PATH_MAX\n",
 843                                 fs_name, len);
 844                 ret = -1;
 845                 goto out;
 846         }
 847
 848         name_offset = (unsigned long) extent_item
 849                         + offsetof(struct btrfs_file_extent_item, disk_bytenr);
 850         read_extent_buffer(leaf, symlink_target, name_offset, len);
 851
 852         symlink_target[len] = 0;
 853
 854         if (!dry_run) {
 855                 ret = symlink(symlink_target, path_name);
 856                 if (ret < 0) {
 857                         fprintf(stderr, "Failed to restore symlink '%s': %s\n",
 858                                         path_name, strerror(errno));
 859                         goto out;
 860                 }
 861         }
 862         printf("SYMLINK: '%s' => '%s'\n", path_name, symlink_target);
 863
 864         ret = 0;
 865         if (!restore_metadata)
 866                 goto out;
 867
 868         /*
 869          * Symlink metadata operates differently than files/directories, so do
 870          * our own work here.
 871          */
 872         key->type = BTRFS_INODE_ITEM_KEY;
 873         key->offset = 0;
 874
 875         btrfs_release_path(&path);
 876
 877         ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
 878         if (ret) {
 879                 fprintf(stderr, "Failed to lookup inode for '%s'\n", file);
 880                 goto out;
 881         }
 882
 883         inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
 884                         struct btrfs_inode_item);
 885
 886         ret = fchownat(-1, file, btrfs_inode_uid(path.nodes[0], inode_item),
 887                                    btrfs_inode_gid(path.nodes[0], inode_item),
 888                                    AT_SYMLINK_NOFOLLOW);
 889         if (ret) {
 890                 fprintf(stderr, "Failed to change owner: %s\n",
 891                                 strerror(errno));
 892                 goto out;
 893         }
 894
 895         bts = btrfs_inode_atime(inode_item);
 896         times[0].tv_sec  = btrfs_timespec_sec(path.nodes[0], bts);
 897         times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 898
 899         bts = btrfs_inode_mtime(inode_item);
 900         times[1].tv_sec  = btrfs_timespec_sec(path.nodes[0], bts);
 901         times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 902
 903         ret = utimensat(-1, file, times, AT_SYMLINK_NOFOLLOW);
 904         if (ret)
 905                 fprintf(stderr, "Failed to set times: %s\n", strerror(errno));
 906 out:
 907         btrfs_release_path(&path);
 908         return ret;
 909 }
 910
 911 static int search_dir(struct btrfs_root *root, struct btrfs_key *key,
 912                       const char *output_rootdir, const char *in_dir,
 913                       const regex_t *mreg)
 914 {
 915         struct btrfs_path *path;
 916         struct extent_buffer *leaf;
 917         struct btrfs_dir_item *dir_item;
 918         struct btrfs_key found_key, location;
 919         char filename[BTRFS_NAME_LEN + 1];
 920         unsigned long name_ptr;
 921         int name_len;
 922         int ret = 0;
 923         int fd;
 924         int loops = 0;
 925         u8 type;
 926
 927         path = btrfs_alloc_path();
 928         if (!path) {
 929                 fprintf(stderr, "Ran out of memory\n");
 930                 return -ENOMEM;
 931         }
 932
 933         key->offset = 0;
 934         key->type = BTRFS_DIR_INDEX_KEY;
 935
 936         ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
 937         if (ret < 0) {
 938                 fprintf(stderr, "Error searching %d\n", ret);
 939                 goto out;
 940         }
 941
 942         ret = 0;
 943
 944         leaf = path->nodes[0];
 945         while (!leaf) {
 946                 if (verbose > 1)
 947                         printf("No leaf after search, looking for the next "
 948                                "leaf\n");
 949                 ret = next_leaf(root, path);
 950                 if (ret < 0) {
 951                         fprintf(stderr, "Error getting next leaf %d\n",
 952                                 ret);
 953                         goto out;
 954                 } else if (ret > 0) {
 955                         /* No more leaves to search */
 956                         if (verbose)
 957                                 printf("Reached the end of the tree looking "
 958                                        "for the directory\n");
 959                         ret = 0;
 960                         goto out;
 961                 }
 962                 leaf = path->nodes[0];
 963         }
 964
 965         while (leaf) {
 966                 if (loops++ >= 1024) {
 967                         printf("We have looped trying to restore files in %s "
 968                                "too many times to be making progress, "
 969                                "stopping\n", in_dir);
 970                         break;
 971                 }
 972
 973                 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
 974                         do {
 975                                 ret = next_leaf(root, path);
 976                                 if (ret < 0) {
 977                                         fprintf(stderr, "Error searching %d\n",
 978                                                 ret);
 979                                         goto out;
 980                                 } else if (ret > 0) {
 981                                         /* No more leaves to search */
 982                                         if (verbose)
 983                                                 printf("Reached the end of "
 984                                                        "the tree searching the"
 985                                                        " directory\n");
 986                                         ret = 0;
 987                                         goto out;
 988                                 }
 989                                 leaf = path->nodes[0];
 990                         } while (!leaf);
 991                         continue;
 992                 }
 993                 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
 994                 if (found_key.objectid != key->objectid) {
 995                         if (verbose > 1)
 996                                 printf("Found objectid=%Lu, key=%Lu\n",
 997                                        found_key.objectid, key->objectid);
 998                         break;
 999                 }
1000                 if (found_key.type != key->type) {
1001                         if (verbose > 1)
1002                                 printf("Found type=%u, want=%u\n",
1003                                        found_key.type, key->type);
1004                         break;
1005                 }
1006                 dir_item = btrfs_item_ptr(leaf, path->slots[0],
1007                                           struct btrfs_dir_item);
1008                 name_ptr = (unsigned long)(dir_item + 1);
1009                 name_len = btrfs_dir_name_len(leaf, dir_item);
1010                 read_extent_buffer(leaf, filename, name_ptr, name_len);
1011                 filename[name_len] = '\0';
1012                 type = btrfs_dir_type(leaf, dir_item);
1013                 btrfs_dir_item_key_to_cpu(leaf, dir_item, &location);
1014
1015                 /* full path from root of btrfs being restored */
1016                 snprintf(fs_name, PATH_MAX, "%s/%s", in_dir, filename);
1017
1018                 if (mreg && REG_NOMATCH == regexec(mreg, fs_name, 0, NULL, 0))
1019                         goto next;
1020
1021                 /* full path from system root */
1022                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, fs_name);
1023
1024                 /*
1025                  * Restore directories, files, symlinks and metadata.
1026                  */
1027                 if (type == BTRFS_FT_REG_FILE) {
1028                         if (!overwrite_ok(path_name))
1029                                 goto next;
1030
1031                         if (verbose)
1032                                 printf("Restoring %s\n", path_name);
1033                         if (dry_run)
1034                                 goto next;
1035                         fd = open(path_name, O_CREAT|O_WRONLY, 0644);
1036                         if (fd < 0) {
1037                                 fprintf(stderr, "Error creating %s: %d\n",
1038                                         path_name, errno);
1039                                 if (ignore_errors)
1040                                         goto next;
1041                                 ret = -1;
1042                                 goto out;
1043                         }
1044                         loops = 0;
1045                         ret = copy_file(root, fd, &location, path_name);
1046                         close(fd);
1047                         if (ret) {
1048                                 fprintf(stderr, "Error copying data for %s\n",
1049                                         path_name);
1050                                 if (ignore_errors)
1051                                         goto next;
1052                                 goto out;
1053                         }
1054                 } else if (type == BTRFS_FT_DIR) {
1055                         struct btrfs_root *search_root = root;
1056                         char *dir = strdup(fs_name);
1057
1058                         if (!dir) {
1059                                 fprintf(stderr, "Ran out of memory\n");
1060                                 ret = -ENOMEM;
1061                                 goto out;
1062                         }
1063
1064                         if (location.type == BTRFS_ROOT_ITEM_KEY) {
1065                                 /*
1066                                  * If we are a snapshot and this is the index
1067                                  * object to ourselves just skip it.
1068                                  */
1069                                 if (location.objectid ==
1070                                     root->root_key.objectid) {
1071                                         free(dir);
1072                                         goto next;
1073                                 }
1074
1075                                 location.offset = (u64)-1;
1076                                 search_root = btrfs_read_fs_root(root->fs_info,
1077                                                                  &location);
1078                                 if (IS_ERR(search_root)) {
1079                                         free(dir);
1080                                         fprintf(stderr, "Error reading "
1081                                                 "subvolume %s: %lu\n",
1082                                                 path_name,
1083                                                 PTR_ERR(search_root));
1084                                         if (ignore_errors)
1085                                                 goto next;
1086                                         ret = PTR_ERR(search_root);
1087                                         goto out;
1088                                 }
1089
1090                                 /*
1091                                  * A subvolume will have a key.offset of 0, a
1092                                  * snapshot will have key.offset of a transid.
1093                                  */
1094                                 if (search_root->root_key.offset != 0 &&
1095                                     get_snaps == 0) {
1096                                         free(dir);
1097                                         printf("Skipping snapshot %s\n",
1098                                                filename);
1099                                         goto next;
1100                                 }
1101                                 location.objectid = BTRFS_FIRST_FREE_OBJECTID;
1102                         }
1103
1104                         if (verbose)
1105                                 printf("Restoring %s\n", path_name);
1106
1107                         errno = 0;
1108                         if (dry_run)
1109                                 ret = 0;
1110                         else
1111                                 ret = mkdir(path_name, 0755);
1112                         if (ret && errno != EEXIST) {
1113                                 free(dir);
1114                                 fprintf(stderr, "Error mkdiring %s: %d\n",
1115                                         path_name, errno);
1116                                 if (ignore_errors)
1117                                         goto next;
1118                                 ret = -1;
1119                                 goto out;
1120                         }
1121                         loops = 0;
1122                         ret = search_dir(search_root, &location,
1123                                          output_rootdir, dir, mreg);
1124                         free(dir);
1125                         if (ret) {
1126                                 fprintf(stderr, "Error searching %s\n",
1127                                         path_name);
1128                                 if (ignore_errors)
1129                                         goto next;
1130                                 goto out;
1131                         }
1132                 } else if (type == BTRFS_FT_SYMLINK) {
1133                         if (restore_symlinks)
1134                                 ret = copy_symlink(root, &location, path_name);
1135                         if (ret < 0) {
1136                                 if (ignore_errors)
1137                                         goto next;
1138                                 btrfs_free_path(path);
1139                                 return ret;
1140                         }
1141                 }
1142 next:
1143                 path->slots[0]++;
1144         }
1145
1146         if (restore_metadata) {
1147                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, in_dir);
1148                 fd = open(path_name, O_RDONLY);
1149                 if (fd < 0) {
1150                         fprintf(stderr, "ERROR: Failed to access %s to restore metadata\n",
1151                                         path_name);
1152                         if (!ignore_errors) {
1153                                 ret = -1;
1154                                 goto out;
1155                         }
1156                 } else {
1157                         /*
1158                          * Set owner/mode/time on the directory as well
1159                          */
1160                         key->type = BTRFS_INODE_ITEM_KEY;
1161                         ret = copy_metadata(root, fd, key);
1162                         close(fd);
1163                         if (ret && !ignore_errors)
1164                                 goto out;
1165                 }
1166         }
1167
1168         if (verbose)
1169                 printf("Done searching %s\n", in_dir);
1170 out:
1171         btrfs_free_path(path);
1172         return ret;
1173 }
1174
1175 static int do_list_roots(struct btrfs_root *root)
1176 {
1177         struct btrfs_key key;
1178         struct btrfs_key found_key;
1179         struct btrfs_disk_key disk_key;
1180         struct btrfs_path *path;
1181         struct extent_buffer *leaf;
1182         struct btrfs_root_item ri;
1183         unsigned long offset;
1184         int slot;
1185         int ret;
1186
1187         root = root->fs_info->tree_root;
1188         path = btrfs_alloc_path();
1189         if (!path) {
1190                 fprintf(stderr, "Failed to alloc path\n");
1191                 return -ENOMEM;
1192         }
1193
1194         key.offset = 0;
1195         key.objectid = 0;
1196         key.type = BTRFS_ROOT_ITEM_KEY;
1197
1198         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1199         if (ret < 0) {
1200                 fprintf(stderr, "Failed to do search %d\n", ret);
1201                 btrfs_free_path(path);
1202                 return -1;
1203         }
1204
1205         leaf = path->nodes[0];
1206
1207         while (1) {
1208                 slot = path->slots[0];
1209                 if (slot >= btrfs_header_nritems(leaf)) {
1210                         ret = btrfs_next_leaf(root, path);
1211                         if (ret)
1212                                 break;
1213                         leaf = path->nodes[0];
1214                         slot = path->slots[0];
1215                 }
1216                 btrfs_item_key(leaf, &disk_key, slot);
1217                 btrfs_disk_key_to_cpu(&found_key, &disk_key);
1218                 if (found_key.type != BTRFS_ROOT_ITEM_KEY) {
1219                         path->slots[0]++;
1220                         continue;
1221                 }
1222
1223                 offset = btrfs_item_ptr_offset(leaf, slot);
1224                 read_extent_buffer(leaf, &ri, offset, sizeof(ri));
1225                 printf(" tree ");
1226                 btrfs_print_key(&disk_key);
1227                 printf(" %Lu level %d\n", btrfs_root_bytenr(&ri),
1228                        btrfs_root_level(&ri));
1229                 path->slots[0]++;
1230         }
1231         btrfs_free_path(path);
1232
1233         return 0;
1234 }
1235
1236 static struct btrfs_root *open_fs(const char *dev, u64 root_location,
1237                                   int super_mirror, int list_roots)
1238 {
1239         struct btrfs_fs_info *fs_info = NULL;
1240         struct btrfs_root *root = NULL;
1241         u64 bytenr;
1242         int i;
1243
1244         for (i = super_mirror; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1245                 bytenr = btrfs_sb_offset(i);
1246                 fs_info = open_ctree_fs_info(dev, bytenr, root_location, 0,
1247                                              OPEN_CTREE_PARTIAL);
1248                 if (fs_info)
1249                         break;
1250                 fprintf(stderr, "Could not open root, trying backup super\n");
1251         }
1252
1253         if (!fs_info)
1254                 return NULL;
1255
1256         /*
1257          * All we really need to succeed is reading the chunk tree, everything
1258          * else we can do by hand, since we only need to read the tree root and
1259          * the fs_root.
1260          */
1261         if (!extent_buffer_uptodate(fs_info->tree_root->node)) {
1262                 u64 generation;
1263
1264                 root = fs_info->tree_root;
1265                 if (!root_location)
1266                         root_location = btrfs_super_root(fs_info->super_copy);
1267                 generation = btrfs_super_generation(fs_info->super_copy);
1268                 root->node = read_tree_block(root, root_location,
1269                                              root->nodesize, generation);
1270                 if (!extent_buffer_uptodate(root->node)) {
1271                         fprintf(stderr, "Error opening tree root\n");
1272                         close_ctree(root);
1273                         return NULL;
1274                 }
1275         }
1276
1277         if (!list_roots && !fs_info->fs_root) {
1278                 struct btrfs_key key;
1279
1280                 key.objectid = BTRFS_FS_TREE_OBJECTID;
1281                 key.type = BTRFS_ROOT_ITEM_KEY;
1282                 key.offset = (u64)-1;
1283                 fs_info->fs_root = btrfs_read_fs_root_no_cache(fs_info, &key);
1284                 if (IS_ERR(fs_info->fs_root)) {
1285                         fprintf(stderr, "Couldn't read fs root: %ld\n",
1286                                 PTR_ERR(fs_info->fs_root));
1287                         close_ctree(fs_info->tree_root);
1288                         return NULL;
1289                 }
1290         }
1291
1292         if (list_roots && do_list_roots(fs_info->tree_root)) {
1293                 close_ctree(fs_info->tree_root);
1294                 return NULL;
1295         }
1296
1297         return fs_info->fs_root;
1298 }
1299
1300 static int find_first_dir(struct btrfs_root *root, u64 *objectid)
1301 {
1302         struct btrfs_path *path;
1303         struct btrfs_key found_key;
1304         struct btrfs_key key;
1305         int ret = -1;
1306         int i;
1307
1308         key.objectid = 0;
1309         key.type = BTRFS_DIR_INDEX_KEY;
1310         key.offset = 0;
1311
1312         path = btrfs_alloc_path();
1313         if (!path) {
1314                 fprintf(stderr, "Ran out of memory\n");
1315                 return ret;
1316         }
1317
1318         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1319         if (ret < 0) {
1320                 fprintf(stderr, "Error searching %d\n", ret);
1321                 goto out;
1322         }
1323
1324         if (!path->nodes[0]) {
1325                 fprintf(stderr, "No leaf!\n");
1326                 goto out;
1327         }
1328 again:
1329         for (i = path->slots[0];
1330              i < btrfs_header_nritems(path->nodes[0]); i++) {
1331                 btrfs_item_key_to_cpu(path->nodes[0], &found_key, i);
1332                 if (found_key.type != key.type)
1333                         continue;
1334
1335                 printf("Using objectid %Lu for first dir\n",
1336                        found_key.objectid);
1337                 *objectid = found_key.objectid;
1338                 ret = 0;
1339                 goto out;
1340         }
1341         do {
1342                 ret = next_leaf(root, path);
1343                 if (ret < 0) {
1344                         fprintf(stderr, "Error getting next leaf %d\n",
1345                                 ret);
1346                         goto out;
1347                 } else if (ret > 0) {
1348                         fprintf(stderr, "No more leaves\n");
1349                         goto out;
1350                 }
1351         } while (!path->nodes[0]);
1352         if (path->nodes[0])
1353                 goto again;
1354         printf("Couldn't find a dir index item\n");
1355 out:
1356         btrfs_free_path(path);
1357         return ret;
1358 }
1359
1360 const char * const cmd_restore_usage[] = {
1361         "btrfs restore [options] <device> <path> | -l <device>",
1362         "Try to restore files from a damaged filesystem (unmounted)",
1363         "",
1364         "-s|--snapshots       get snapshots",
1365         "-x|--xattr           restore extended attributes",
1366         "-m|--metadata        restore owner, mode and times",
1367         "-S|--symlink         restore symbolic links",
1368         "-v|--verbose         verbose",
1369         "-i|--ignore-errors   ignore errors",
1370         "-o|--overwrite       overwrite",
1371         "-t <bytenr>          tree location",
1372         "-f <bytenr>          filesystem location",
1373         "-u|--super <mirror>  super mirror",
1374         "-r|--root <rootid>   root objectid",
1375         "-d                   find dir",
1376         "-l|--list-roots      list tree roots",
1377         "-D|--dry-run         dry run (only list files that would be recovered)",
1378         "--path-regex <regex>",
1379         "                     restore only filenames matching regex,",
1380         "                     you have to use following syntax (possibly quoted):",
1381         "                     ^/(|home(|/username(|/Desktop(|/.*))))$",
1382         "-c                   ignore case (--path-regex only)",
1383         NULL
1384 };
1385
1386 int cmd_restore(int argc, char **argv)
1387 {
1388         struct btrfs_root *root;
1389         struct btrfs_key key;
1390         char dir_name[PATH_MAX];
1391         u64 tree_location = 0;
1392         u64 fs_location = 0;
1393         u64 root_objectid = 0;
1394         int len;
1395         int ret;
1396         int super_mirror = 0;
1397         int find_dir = 0;
1398         int list_roots = 0;
1399         const char *match_regstr = NULL;
1400         int match_cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
1401         regex_t match_reg, *mreg = NULL;
1402         char reg_err[256];
1403
1404         while (1) {
1405                 int opt;
1406                 enum { GETOPT_VAL_PATH_REGEX = 256 };
1407                 static const struct option long_options[] = {
1408                         { "path-regex", required_argument, NULL,
1409                                 GETOPT_VAL_PATH_REGEX },
1410                         { "dry-run", no_argument, NULL, 'D'},
1411                         { "metadata", no_argument, NULL, 'm'},
1412                         { "symlinks", no_argument, NULL, 'S'},
1413                         { "snapshots", no_argument, NULL, 's'},
1414                         { "xattr", no_argument, NULL, 'x'},
1415                         { "verbose", no_argument, NULL, 'v'},
1416                         { "ignore-errors", no_argument, NULL, 'i'},
1417                         { "overwrite", no_argument, NULL, 'o'},
1418                         { "super", required_argument, NULL, 'u'},
1419                         { "root", required_argument, NULL, 'r'},
1420                         { "list-roots", no_argument, NULL, 'l'},
1421                         { NULL, 0, NULL, 0}
1422                 };
1423
1424                 opt = getopt_long(argc, argv, "sSxviot:u:dmf:r:lDc", long_options,
1425                                         NULL);
1426                 if (opt < 0)
1427                         break;
1428
1429                 switch (opt) {
1430                         case 's':
1431                                 get_snaps = 1;
1432                                 break;
1433                         case 'v':
1434                                 verbose++;
1435                                 break;
1436                         case 'i':
1437                                 ignore_errors = 1;
1438                                 break;
1439                         case 'o':
1440                                 overwrite = 1;
1441                                 break;
1442                         case 't':
1443                                 tree_location = arg_strtou64(optarg);
1444                                 break;
1445                         case 'f':
1446                                 fs_location = arg_strtou64(optarg);
1447                                 break;
1448                         case 'u':
1449                                 super_mirror = arg_strtou64(optarg);
1450                                 if (super_mirror >= BTRFS_SUPER_MIRROR_MAX) {
1451                                         fprintf(stderr, "Super mirror not "
1452                                                 "valid\n");
1453                                         exit(1);
1454                                 }
1455                                 break;
1456                         case 'd':
1457                                 find_dir = 1;
1458                                 break;
1459                         case 'r':
1460                                 root_objectid = arg_strtou64(optarg);
1461                                 if (!is_fstree(root_objectid)) {
1462                                         fprintf(stderr, "objectid %llu is not a valid fs/file tree\n",
1463                                                         root_objectid);
1464                                         exit(1);
1465                                 }
1466                                 break;
1467                         case 'l':
1468                                 list_roots = 1;
1469                                 break;
1470                         case 'm':
1471                                 restore_metadata = 1;
1472                                 break;
1473                         case 'S':
1474                                 restore_symlinks = 1;
1475                                 break;
1476                         case 'D':
1477                                 dry_run = 1;
1478                                 break;
1479                         case 'c':
1480                                 match_cflags |= REG_ICASE;
1481                                 break;
1482                         case GETOPT_VAL_PATH_REGEX:
1483                                 match_regstr = optarg;
1484                                 break;
1485                         case 'x':
1486                                 get_xattrs = 1;
1487                                 break;
1488                         default:
1489                                 usage(cmd_restore_usage);
1490                 }
1491         }
1492
1493         if (!list_roots && check_argc_min(argc - optind, 2))
1494                 usage(cmd_restore_usage);
1495         else if (list_roots && check_argc_min(argc - optind, 1))
1496                 usage(cmd_restore_usage);
1497
1498         if (fs_location && root_objectid) {
1499                 fprintf(stderr, "don't use -f and -r at the same time.\n");
1500                 return 1;
1501         }
1502
1503         if ((ret = check_mounted(argv[optind])) < 0) {
1504                 fprintf(stderr, "Could not check mount status: %s\n",
1505                         strerror(-ret));
1506                 return 1;
1507         } else if (ret) {
1508                 fprintf(stderr, "%s is currently mounted.  Aborting.\n", argv[optind]);
1509                 return 1;
1510         }
1511
1512         root = open_fs(argv[optind], tree_location, super_mirror, list_roots);
1513         if (root == NULL)
1514                 return 1;
1515
1516         if (list_roots)
1517                 goto out;
1518
1519         if (fs_location != 0) {
1520                 free_extent_buffer(root->node);
1521                 root->node = read_tree_block(root, fs_location, root->nodesize, 0);
1522                 if (!extent_buffer_uptodate(root->node)) {
1523                         fprintf(stderr, "Failed to read fs location\n");
1524                         ret = 1;
1525                         goto out;
1526                 }
1527         }
1528
1529         memset(path_name, 0, PATH_MAX);
1530
1531         if (strlen(argv[optind + 1]) >= PATH_MAX) {
1532                 fprintf(stderr, "ERROR: path too long\n");
1533                 ret = 1;
1534                 goto out;
1535         }
1536         strncpy(dir_name, argv[optind + 1], sizeof dir_name);
1537         dir_name[sizeof dir_name - 1] = 0;
1538
1539         /* Strip the trailing / on the dir name */
1540         len = strlen(dir_name);
1541         while (len && dir_name[--len] == '/') {
1542                 dir_name[len] = '\0';
1543         }
1544
1545         if (root_objectid != 0) {
1546                 struct btrfs_root *orig_root = root;
1547
1548                 key.objectid = root_objectid;
1549                 key.type = BTRFS_ROOT_ITEM_KEY;
1550                 key.offset = (u64)-1;
1551                 root = btrfs_read_fs_root(orig_root->fs_info, &key);
1552                 if (IS_ERR(root)) {
1553                         fprintf(stderr, "fail to read root %llu: %s\n",
1554                                         root_objectid, strerror(-PTR_ERR(root)));
1555                         root = orig_root;
1556                         ret = 1;
1557                         goto out;
1558                 }
1559                 key.type = 0;
1560                 key.offset = 0;
1561         }
1562
1563         if (find_dir) {
1564                 ret = find_first_dir(root, &key.objectid);
1565                 if (ret)
1566                         goto out;
1567         } else {
1568                 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
1569         }
1570
1571         if (match_regstr) {
1572                 ret = regcomp(&match_reg, match_regstr, match_cflags);
1573                 if (ret) {
1574                         regerror(ret, &match_reg, reg_err, sizeof(reg_err));
1575                         fprintf(stderr, "Regex compile failed: %s\n", reg_err);
1576                         goto out;
1577                 }
1578                 mreg = &match_reg;
1579         }
1580
1581         if (dry_run)
1582                 printf("This is a dry-run, no files are going to be restored\n");
1583
1584         ret = search_dir(root, &key, dir_name, "", mreg);
1585
1586 out:
1587         if (mreg)
1588                 regfree(mreg);
1589         close_ctree(root);
1590         return !!ret;
1591 }