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->fs_info->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->fs_info->sectorsize;
 147                 rem_page = root->fs_info->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         struct btrfs_fs_info *fs_info = root->fs_info;
 185
 186 again:
 187         for (; level < BTRFS_MAX_LEVEL; level++) {
 188                 if (path->nodes[level])
 189                         break;
 190         }
 191
 192         if (level >= BTRFS_MAX_LEVEL)
 193                 return 1;
 194
 195         slot = path->slots[level] + 1;
 196
 197         while(level < BTRFS_MAX_LEVEL) {
 198                 if (!path->nodes[level])
 199                         return 1;
 200
 201                 slot = path->slots[level] + offset;
 202                 c = path->nodes[level];
 203                 if (slot >= btrfs_header_nritems(c)) {
 204                         level++;
 205                         if (level == BTRFS_MAX_LEVEL)
 206                                 return 1;
 207                         offset = 1;
 208                         continue;
 209                 }
 210
 211                 if (path->reada)
 212                         reada_for_search(root, path, level, slot, 0);
 213
 214                 next = read_node_slot(fs_info, c, slot);
 215                 if (extent_buffer_uptodate(next))
 216                         break;
 217                 offset++;
 218         }
 219         path->slots[level] = slot;
 220         while(1) {
 221                 level--;
 222                 c = path->nodes[level];
 223                 free_extent_buffer(c);
 224                 path->nodes[level] = next;
 225                 path->slots[level] = 0;
 226                 if (!level)
 227                         break;
 228                 if (path->reada)
 229                         reada_for_search(root, path, level, 0, 0);
 230                 next = read_node_slot(fs_info, next, 0);
 231                 if (!extent_buffer_uptodate(next))
 232                         goto again;
 233         }
 234         return 0;
 235 }
 236
 237 static int copy_one_inline(struct btrfs_root *root, int fd,
 238                                 struct btrfs_path *path, u64 pos)
 239 {
 240         struct extent_buffer *leaf = path->nodes[0];
 241         struct btrfs_file_extent_item *fi;
 242         char buf[4096];
 243         char *outbuf;
 244         u64 ram_size;
 245         ssize_t done;
 246         unsigned long ptr;
 247         int ret;
 248         int len;
 249         int inline_item_len;
 250         int compress;
 251
 252         fi = btrfs_item_ptr(leaf, path->slots[0],
 253                             struct btrfs_file_extent_item);
 254         ptr = btrfs_file_extent_inline_start(fi);
 255         len = btrfs_file_extent_inline_len(leaf, path->slots[0], fi);
 256         inline_item_len = btrfs_file_extent_inline_item_len(leaf, btrfs_item_nr(path->slots[0]));
 257         read_extent_buffer(leaf, buf, ptr, inline_item_len);
 258
 259         compress = btrfs_file_extent_compression(leaf, fi);
 260         if (compress == BTRFS_COMPRESS_NONE) {
 261                 done = pwrite(fd, buf, len, pos);
 262                 if (done < len) {
 263                         fprintf(stderr, "Short inline write, wanted %d, did "
 264                                 "%zd: %d\n", len, done, errno);
 265                         return -1;
 266                 }
 267                 return 0;
 268         }
 269
 270         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 271         outbuf = calloc(1, ram_size);
 272         if (!outbuf) {
 273                 error("not enough memory");
 274                 return -ENOMEM;
 275         }
 276
 277         ret = decompress(root, buf, outbuf, len, &ram_size, compress);
 278         if (ret) {
 279                 free(outbuf);
 280                 return ret;
 281         }
 282
 283         done = pwrite(fd, outbuf, ram_size, pos);
 284         free(outbuf);
 285         if (done < ram_size) {
 286                 fprintf(stderr, "Short compressed inline write, wanted %Lu, "
 287                         "did %zd: %d\n", ram_size, done, errno);
 288                 return -1;
 289         }
 290
 291         return 0;
 292 }
 293
 294 static int copy_one_extent(struct btrfs_root *root, int fd,
 295                            struct extent_buffer *leaf,
 296                            struct btrfs_file_extent_item *fi, u64 pos)
 297 {
 298         struct btrfs_multi_bio *multi = NULL;
 299         struct btrfs_device *device;
 300         char *inbuf, *outbuf = NULL;
 301         ssize_t done, total = 0;
 302         u64 bytenr;
 303         u64 ram_size;
 304         u64 disk_size;
 305         u64 num_bytes;
 306         u64 length;
 307         u64 size_left;
 308         u64 dev_bytenr;
 309         u64 offset;
 310         u64 count = 0;
 311         int compress;
 312         int ret;
 313         int dev_fd;
 314         int mirror_num = 1;
 315         int num_copies;
 316
 317         compress = btrfs_file_extent_compression(leaf, fi);
 318         bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
 319         disk_size = btrfs_file_extent_disk_num_bytes(leaf, fi);
 320         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 321         offset = btrfs_file_extent_offset(leaf, fi);
 322         num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
 323         size_left = disk_size;
 324         if (compress == BTRFS_COMPRESS_NONE)
 325                 bytenr += offset;
 326
 327         if (verbose && offset)
 328                 printf("offset is %Lu\n", offset);
 329         /* we found a hole */
 330         if (disk_size == 0)
 331                 return 0;
 332
 333         inbuf = malloc(size_left);
 334         if (!inbuf) {
 335                 error("not enough memory");
 336                 return -ENOMEM;
 337         }
 338
 339         if (compress != BTRFS_COMPRESS_NONE) {
 340                 outbuf = calloc(1, ram_size);
 341                 if (!outbuf) {
 342                         error("not enough memory");
 343                         free(inbuf);
 344                         return -ENOMEM;
 345                 }
 346         }
 347 again:
 348         length = size_left;
 349         ret = btrfs_map_block(root->fs_info, READ, bytenr, &length, &multi,
 350                               mirror_num, NULL);
 351         if (ret) {
 352                 error("cannot map block logical %llu length %llu: %d",
 353                                 (unsigned long long)bytenr,
 354                                 (unsigned long long)length, ret);
 355                 goto out;
 356         }
 357         device = multi->stripes[0].dev;
 358         dev_fd = device->fd;
 359         device->total_ios++;
 360         dev_bytenr = multi->stripes[0].physical;
 361         free(multi);
 362
 363         if (size_left < length)
 364                 length = size_left;
 365
 366         done = pread(dev_fd, inbuf+count, length, dev_bytenr);
 367         /* Need both checks, or we miss negative values due to u64 conversion */
 368         if (done < 0 || done < length) {
 369                 num_copies = btrfs_num_copies(root->fs_info, 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, 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",
 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         btrfs_init_path(&path);
 928         key->offset = 0;
 929         key->type = BTRFS_DIR_INDEX_KEY;
 930         ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
 931         if (ret < 0) {
 932                 fprintf(stderr, "Error searching %d\n", ret);
 933                 goto out;
 934         }
 935
 936         ret = 0;
 937
 938         leaf = path.nodes[0];
 939         while (!leaf) {
 940                 if (verbose > 1)
 941                         printf("No leaf after search, looking for the next "
 942                                "leaf\n");
 943                 ret = next_leaf(root, &path);
 944                 if (ret < 0) {
 945                         fprintf(stderr, "Error getting next leaf %d\n",
 946                                 ret);
 947                         goto out;
 948                 } else if (ret > 0) {
 949                         /* No more leaves to search */
 950                         if (verbose)
 951                                 printf("Reached the end of the tree looking "
 952                                        "for the directory\n");
 953                         ret = 0;
 954                         goto out;
 955                 }
 956                 leaf = path.nodes[0];
 957         }
 958
 959         while (leaf) {
 960                 if (loops++ >= 1024) {
 961                         printf("We have looped trying to restore files in %s "
 962                                "too many times to be making progress, "
 963                                "stopping\n", in_dir);
 964                         break;
 965                 }
 966
 967                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
 968                         do {
 969                                 ret = next_leaf(root, &path);
 970                                 if (ret < 0) {
 971                                         fprintf(stderr, "Error searching %d\n",
 972                                                 ret);
 973                                         goto out;
 974                                 } else if (ret > 0) {
 975                                         /* No more leaves to search */
 976                                         if (verbose)
 977                                                 printf("Reached the end of "
 978                                                        "the tree searching the"
 979                                                        " directory\n");
 980                                         ret = 0;
 981                                         goto out;
 982                                 }
 983                                 leaf = path.nodes[0];
 984                         } while (!leaf);
 985                         continue;
 986                 }
 987                 btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
 988                 if (found_key.objectid != key->objectid) {
 989                         if (verbose > 1)
 990                                 printf("Found objectid=%Lu, key=%Lu\n",
 991                                        found_key.objectid, key->objectid);
 992                         break;
 993                 }
 994                 if (found_key.type != key->type) {
 995                         if (verbose > 1)
 996                                 printf("Found type=%u, want=%u\n",
 997                                        found_key.type, key->type);
 998                         break;
 999                 }
1000                 dir_item = btrfs_item_ptr(leaf, path.slots[0],
1001                                           struct btrfs_dir_item);
1002                 name_ptr = (unsigned long)(dir_item + 1);
1003                 name_len = btrfs_dir_name_len(leaf, dir_item);
1004                 read_extent_buffer(leaf, filename, name_ptr, name_len);
1005                 filename[name_len] = '\0';
1006                 type = btrfs_dir_type(leaf, dir_item);
1007                 btrfs_dir_item_key_to_cpu(leaf, dir_item, &location);
1008
1009                 /* full path from root of btrfs being restored */
1010                 snprintf(fs_name, PATH_MAX, "%s/%s", in_dir, filename);
1011
1012                 if (mreg && REG_NOMATCH == regexec(mreg, fs_name, 0, NULL, 0))
1013                         goto next;
1014
1015                 /* full path from system root */
1016                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, fs_name);
1017
1018                 /*
1019                  * Restore directories, files, symlinks and metadata.
1020                  */
1021                 if (type == BTRFS_FT_REG_FILE) {
1022                         if (!overwrite_ok(path_name))
1023                                 goto next;
1024
1025                         if (verbose)
1026                                 printf("Restoring %s\n", path_name);
1027                         if (dry_run)
1028                                 goto next;
1029                         fd = open(path_name, O_CREAT|O_WRONLY, 0644);
1030                         if (fd < 0) {
1031                                 fprintf(stderr, "Error creating %s: %d\n",
1032                                         path_name, errno);
1033                                 if (ignore_errors)
1034                                         goto next;
1035                                 ret = -1;
1036                                 goto out;
1037                         }
1038                         loops = 0;
1039                         ret = copy_file(root, fd, &location, path_name);
1040                         close(fd);
1041                         if (ret) {
1042                                 fprintf(stderr, "Error copying data for %s\n",
1043                                         path_name);
1044                                 if (ignore_errors)
1045                                         goto next;
1046                                 goto out;
1047                         }
1048                 } else if (type == BTRFS_FT_DIR) {
1049                         struct btrfs_root *search_root = root;
1050                         char *dir = strdup(fs_name);
1051
1052                         if (!dir) {
1053                                 fprintf(stderr, "Ran out of memory\n");
1054                                 ret = -ENOMEM;
1055                                 goto out;
1056                         }
1057
1058                         if (location.type == BTRFS_ROOT_ITEM_KEY) {
1059                                 /*
1060                                  * If we are a snapshot and this is the index
1061                                  * object to ourselves just skip it.
1062                                  */
1063                                 if (location.objectid ==
1064                                     root->root_key.objectid) {
1065                                         free(dir);
1066                                         goto next;
1067                                 }
1068
1069                                 location.offset = (u64)-1;
1070                                 search_root = btrfs_read_fs_root(root->fs_info,
1071                                                                  &location);
1072                                 if (IS_ERR(search_root)) {
1073                                         free(dir);
1074                                         fprintf(stderr, "Error reading "
1075                                                 "subvolume %s: %lu\n",
1076                                                 path_name,
1077                                                 PTR_ERR(search_root));
1078                                         if (ignore_errors)
1079                                                 goto next;
1080                                         ret = PTR_ERR(search_root);
1081                                         goto out;
1082                                 }
1083
1084                                 /*
1085                                  * A subvolume will have a key.offset of 0, a
1086                                  * snapshot will have key.offset of a transid.
1087                                  */
1088                                 if (search_root->root_key.offset != 0 &&
1089                                     get_snaps == 0) {
1090                                         free(dir);
1091                                         printf("Skipping snapshot %s\n",
1092                                                filename);
1093                                         goto next;
1094                                 }
1095                                 location.objectid = BTRFS_FIRST_FREE_OBJECTID;
1096                         }
1097
1098                         if (verbose)
1099                                 printf("Restoring %s\n", path_name);
1100
1101                         errno = 0;
1102                         if (dry_run)
1103                                 ret = 0;
1104                         else
1105                                 ret = mkdir(path_name, 0755);
1106                         if (ret && errno != EEXIST) {
1107                                 free(dir);
1108                                 fprintf(stderr, "Error mkdiring %s: %d\n",
1109                                         path_name, errno);
1110                                 if (ignore_errors)
1111                                         goto next;
1112                                 ret = -1;
1113                                 goto out;
1114                         }
1115                         loops = 0;
1116                         ret = search_dir(search_root, &location,
1117                                          output_rootdir, dir, mreg);
1118                         free(dir);
1119                         if (ret) {
1120                                 fprintf(stderr, "Error searching %s\n",
1121                                         path_name);
1122                                 if (ignore_errors)
1123                                         goto next;
1124                                 goto out;
1125                         }
1126                 } else if (type == BTRFS_FT_SYMLINK) {
1127                         if (restore_symlinks)
1128                                 ret = copy_symlink(root, &location, path_name);
1129                         if (ret < 0) {
1130                                 if (ignore_errors)
1131                                         goto next;
1132                                 btrfs_release_path(&path);
1133                                 return ret;
1134                         }
1135                 }
1136 next:
1137                 path.slots[0]++;
1138         }
1139
1140         if (restore_metadata) {
1141                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, in_dir);
1142                 fd = open(path_name, O_RDONLY);
1143                 if (fd < 0) {
1144                         fprintf(stderr, "ERROR: Failed to access %s to restore metadata\n",
1145                                         path_name);
1146                         if (!ignore_errors) {
1147                                 ret = -1;
1148                                 goto out;
1149                         }
1150                 } else {
1151                         /*
1152                          * Set owner/mode/time on the directory as well
1153                          */
1154                         key->type = BTRFS_INODE_ITEM_KEY;
1155                         ret = copy_metadata(root, fd, key);
1156                         close(fd);
1157                         if (ret && !ignore_errors)
1158                                 goto out;
1159                 }
1160         }
1161
1162         if (verbose)
1163                 printf("Done searching %s\n", in_dir);
1164 out:
1165         btrfs_release_path(&path);
1166         return ret;
1167 }
1168
1169 static int do_list_roots(struct btrfs_root *root)
1170 {
1171         struct btrfs_key key;
1172         struct btrfs_key found_key;
1173         struct btrfs_disk_key disk_key;
1174         struct btrfs_path path;
1175         struct extent_buffer *leaf;
1176         struct btrfs_root_item ri;
1177         unsigned long offset;
1178         int slot;
1179         int ret;
1180
1181         root = root->fs_info->tree_root;
1182
1183         btrfs_init_path(&path);
1184         key.offset = 0;
1185         key.objectid = 0;
1186         key.type = BTRFS_ROOT_ITEM_KEY;
1187         ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
1188         if (ret < 0) {
1189                 fprintf(stderr, "Failed to do search %d\n", ret);
1190                 btrfs_release_path(&path);
1191                 return -1;
1192         }
1193
1194         leaf = path.nodes[0];
1195
1196         while (1) {
1197                 slot = path.slots[0];
1198                 if (slot >= btrfs_header_nritems(leaf)) {
1199                         ret = btrfs_next_leaf(root, &path);
1200                         if (ret)
1201                                 break;
1202                         leaf = path.nodes[0];
1203                         slot = path.slots[0];
1204                 }
1205                 btrfs_item_key(leaf, &disk_key, slot);
1206                 btrfs_disk_key_to_cpu(&found_key, &disk_key);
1207                 if (found_key.type != BTRFS_ROOT_ITEM_KEY) {
1208                         path.slots[0]++;
1209                         continue;
1210                 }
1211
1212                 offset = btrfs_item_ptr_offset(leaf, slot);
1213                 read_extent_buffer(leaf, &ri, offset, sizeof(ri));
1214                 printf(" tree ");
1215                 btrfs_print_key(&disk_key);
1216                 printf(" %Lu level %d\n", btrfs_root_bytenr(&ri),
1217                        btrfs_root_level(&ri));
1218                 path.slots[0]++;
1219         }
1220         btrfs_release_path(&path);
1221
1222         return 0;
1223 }
1224
1225 static struct btrfs_root *open_fs(const char *dev, u64 root_location,
1226                                   int super_mirror, int list_roots)
1227 {
1228         struct btrfs_fs_info *fs_info = NULL;
1229         struct btrfs_root *root = NULL;
1230         u64 bytenr;
1231         int i;
1232
1233         for (i = super_mirror; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1234                 bytenr = btrfs_sb_offset(i);
1235                 fs_info = open_ctree_fs_info(dev, bytenr, root_location, 0,
1236                                              OPEN_CTREE_PARTIAL);
1237                 if (fs_info)
1238                         break;
1239                 fprintf(stderr, "Could not open root, trying backup super\n");
1240         }
1241
1242         if (!fs_info)
1243                 return NULL;
1244
1245         /*
1246          * All we really need to succeed is reading the chunk tree, everything
1247          * else we can do by hand, since we only need to read the tree root and
1248          * the fs_root.
1249          */
1250         if (!extent_buffer_uptodate(fs_info->tree_root->node)) {
1251                 u64 generation;
1252
1253                 root = fs_info->tree_root;
1254                 if (!root_location)
1255                         root_location = btrfs_super_root(fs_info->super_copy);
1256                 generation = btrfs_super_generation(fs_info->super_copy);
1257                 root->node = read_tree_block(fs_info, root_location,
1258                                              fs_info->nodesize, generation);
1259                 if (!extent_buffer_uptodate(root->node)) {
1260                         fprintf(stderr, "Error opening tree root\n");
1261                         close_ctree(root);
1262                         return NULL;
1263                 }
1264         }
1265
1266         if (!list_roots && !fs_info->fs_root) {
1267                 struct btrfs_key key;
1268
1269                 key.objectid = BTRFS_FS_TREE_OBJECTID;
1270                 key.type = BTRFS_ROOT_ITEM_KEY;
1271                 key.offset = (u64)-1;
1272                 fs_info->fs_root = btrfs_read_fs_root_no_cache(fs_info, &key);
1273                 if (IS_ERR(fs_info->fs_root)) {
1274                         fprintf(stderr, "Couldn't read fs root: %ld\n",
1275                                 PTR_ERR(fs_info->fs_root));
1276                         close_ctree(fs_info->tree_root);
1277                         return NULL;
1278                 }
1279         }
1280
1281         if (list_roots && do_list_roots(fs_info->tree_root)) {
1282                 close_ctree(fs_info->tree_root);
1283                 return NULL;
1284         }
1285
1286         return fs_info->fs_root;
1287 }
1288
1289 static int find_first_dir(struct btrfs_root *root, u64 *objectid)
1290 {
1291         struct btrfs_path path;
1292         struct btrfs_key found_key;
1293         struct btrfs_key key;
1294         int ret = -1;
1295         int i;
1296
1297         btrfs_init_path(&path);
1298         key.objectid = 0;
1299         key.type = BTRFS_DIR_INDEX_KEY;
1300         key.offset = 0;
1301         ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
1302         if (ret < 0) {
1303                 fprintf(stderr, "Error searching %d\n", ret);
1304                 goto out;
1305         }
1306
1307         if (!path.nodes[0]) {
1308                 fprintf(stderr, "No leaf!\n");
1309                 goto out;
1310         }
1311 again:
1312         for (i = path.slots[0];
1313              i < btrfs_header_nritems(path.nodes[0]); i++) {
1314                 btrfs_item_key_to_cpu(path.nodes[0], &found_key, i);
1315                 if (found_key.type != key.type)
1316                         continue;
1317
1318                 printf("Using objectid %Lu for first dir\n",
1319                        found_key.objectid);
1320                 *objectid = found_key.objectid;
1321                 ret = 0;
1322                 goto out;
1323         }
1324         do {
1325                 ret = next_leaf(root, &path);
1326                 if (ret < 0) {
1327                         fprintf(stderr, "Error getting next leaf %d\n",
1328                                 ret);
1329                         goto out;
1330                 } else if (ret > 0) {
1331                         fprintf(stderr, "No more leaves\n");
1332                         goto out;
1333                 }
1334         } while (!path.nodes[0]);
1335         if (path.nodes[0])
1336                 goto again;
1337         printf("Couldn't find a dir index item\n");
1338 out:
1339         btrfs_release_path(&path);
1340         return ret;
1341 }
1342
1343 const char * const cmd_restore_usage[] = {
1344         "btrfs restore [options] <device> <path> | -l <device>",
1345         "Try to restore files from a damaged filesystem (unmounted)",
1346         "",
1347         "-s|--snapshots       get snapshots",
1348         "-x|--xattr           restore extended attributes",
1349         "-m|--metadata        restore owner, mode and times",
1350         "-S|--symlink         restore symbolic links",
1351         "-v|--verbose         verbose",
1352         "-i|--ignore-errors   ignore errors",
1353         "-o|--overwrite       overwrite",
1354         "-t <bytenr>          tree location",
1355         "-f <bytenr>          filesystem location",
1356         "-u|--super <mirror>  super mirror",
1357         "-r|--root <rootid>   root objectid",
1358         "-d                   find dir",
1359         "-l|--list-roots      list tree roots",
1360         "-D|--dry-run         dry run (only list files that would be recovered)",
1361         "--path-regex <regex>",
1362         "                     restore only filenames matching regex,",
1363         "                     you have to use following syntax (possibly quoted):",
1364         "                     ^/(|home(|/username(|/Desktop(|/.*))))$",
1365         "-c                   ignore case (--path-regex only)",
1366         NULL
1367 };
1368
1369 int cmd_restore(int argc, char **argv)
1370 {
1371         struct btrfs_root *root;
1372         struct btrfs_key key;
1373         char dir_name[PATH_MAX];
1374         u64 tree_location = 0;
1375         u64 fs_location = 0;
1376         u64 root_objectid = 0;
1377         int len;
1378         int ret;
1379         int super_mirror = 0;
1380         int find_dir = 0;
1381         int list_roots = 0;
1382         const char *match_regstr = NULL;
1383         int match_cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
1384         regex_t match_reg, *mreg = NULL;
1385         char reg_err[256];
1386
1387         while (1) {
1388                 int opt;
1389                 enum { GETOPT_VAL_PATH_REGEX = 256 };
1390                 static const struct option long_options[] = {
1391                         { "path-regex", required_argument, NULL,
1392                                 GETOPT_VAL_PATH_REGEX },
1393                         { "dry-run", no_argument, NULL, 'D'},
1394                         { "metadata", no_argument, NULL, 'm'},
1395                         { "symlinks", no_argument, NULL, 'S'},
1396                         { "snapshots", no_argument, NULL, 's'},
1397                         { "xattr", no_argument, NULL, 'x'},
1398                         { "verbose", no_argument, NULL, 'v'},
1399                         { "ignore-errors", no_argument, NULL, 'i'},
1400                         { "overwrite", no_argument, NULL, 'o'},
1401                         { "super", required_argument, NULL, 'u'},
1402                         { "root", required_argument, NULL, 'r'},
1403                         { "list-roots", no_argument, NULL, 'l'},
1404                         { NULL, 0, NULL, 0}
1405                 };
1406
1407                 opt = getopt_long(argc, argv, "sSxviot:u:dmf:r:lDc", long_options,
1408                                         NULL);
1409                 if (opt < 0)
1410                         break;
1411
1412                 switch (opt) {
1413                         case 's':
1414                                 get_snaps = 1;
1415                                 break;
1416                         case 'v':
1417                                 verbose++;
1418                                 break;
1419                         case 'i':
1420                                 ignore_errors = 1;
1421                                 break;
1422                         case 'o':
1423                                 overwrite = 1;
1424                                 break;
1425                         case 't':
1426                                 tree_location = arg_strtou64(optarg);
1427                                 break;
1428                         case 'f':
1429                                 fs_location = arg_strtou64(optarg);
1430                                 break;
1431                         case 'u':
1432                                 super_mirror = arg_strtou64(optarg);
1433                                 if (super_mirror >= BTRFS_SUPER_MIRROR_MAX) {
1434                                         fprintf(stderr, "Super mirror not "
1435                                                 "valid\n");
1436                                         exit(1);
1437                                 }
1438                                 break;
1439                         case 'd':
1440                                 find_dir = 1;
1441                                 break;
1442                         case 'r':
1443                                 root_objectid = arg_strtou64(optarg);
1444                                 if (!is_fstree(root_objectid)) {
1445                                         fprintf(stderr, "objectid %llu is not a valid fs/file tree\n",
1446                                                         root_objectid);
1447                                         exit(1);
1448                                 }
1449                                 break;
1450                         case 'l':
1451                                 list_roots = 1;
1452                                 break;
1453                         case 'm':
1454                                 restore_metadata = 1;
1455                                 break;
1456                         case 'S':
1457                                 restore_symlinks = 1;
1458                                 break;
1459                         case 'D':
1460                                 dry_run = 1;
1461                                 break;
1462                         case 'c':
1463                                 match_cflags |= REG_ICASE;
1464                                 break;
1465                         case GETOPT_VAL_PATH_REGEX:
1466                                 match_regstr = optarg;
1467                                 break;
1468                         case 'x':
1469                                 get_xattrs = 1;
1470                                 break;
1471                         default:
1472                                 usage(cmd_restore_usage);
1473                 }
1474         }
1475
1476         if (!list_roots && check_argc_min(argc - optind, 2))
1477                 usage(cmd_restore_usage);
1478         else if (list_roots && check_argc_min(argc - optind, 1))
1479                 usage(cmd_restore_usage);
1480
1481         if (fs_location && root_objectid) {
1482                 fprintf(stderr, "don't use -f and -r at the same time.\n");
1483                 return 1;
1484         }
1485
1486         if ((ret = check_mounted(argv[optind])) < 0) {
1487                 fprintf(stderr, "Could not check mount status: %s\n",
1488                         strerror(-ret));
1489                 return 1;
1490         } else if (ret) {
1491                 fprintf(stderr, "%s is currently mounted.  Aborting.\n", argv[optind]);
1492                 return 1;
1493         }
1494
1495         root = open_fs(argv[optind], tree_location, super_mirror, list_roots);
1496         if (root == NULL)
1497                 return 1;
1498
1499         if (list_roots)
1500                 goto out;
1501
1502         if (fs_location != 0) {
1503                 free_extent_buffer(root->node);
1504                 root->node = read_tree_block(root->fs_info, fs_location,
1505                                 root->fs_info->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 }