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->mapping_tree, READ,
 350                               bytenr, &length, &multi, 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->mapping_tree,
 370                                               bytenr, length);
 371                 mirror_num++;
 372                 /* mirror_num is 1-indexed, so num_copies is a valid mirror. */
 373                 if (mirror_num > num_copies) {
 374                         ret = -1;
 375                         error("exhausted mirrors trying to read (%d > %d)",
 376                                         mirror_num, num_copies);
 377                         goto out;
 378                 }
 379                 fprintf(stderr, "Trying another mirror\n");
 380                 goto again;
 381         }
 382
 383         mirror_num = 1;
 384         size_left -= length;
 385         count += length;
 386         bytenr += length;
 387         if (size_left)
 388                 goto again;
 389
 390         if (compress == BTRFS_COMPRESS_NONE) {
 391                 while (total < num_bytes) {
 392                         done = pwrite(fd, inbuf+total, num_bytes-total,
 393                                       pos+total);
 394                         if (done < 0) {
 395                                 ret = -1;
 396                                 error("cannot write data: %d %s", errno, strerror(errno));
 397                                 goto out;
 398                         }
 399                         total += done;
 400                 }
 401                 ret = 0;
 402                 goto out;
 403         }
 404
 405         ret = decompress(root, inbuf, outbuf, disk_size, &ram_size, compress);
 406         if (ret) {
 407                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 408                                               bytenr, length);
 409                 mirror_num++;
 410                 if (mirror_num >= num_copies) {
 411                         ret = -1;
 412                         goto out;
 413                 }
 414                 fprintf(stderr, "Trying another mirror\n");
 415                 goto again;
 416         }
 417
 418         while (total < num_bytes) {
 419                 done = pwrite(fd, outbuf + offset + total,
 420                               num_bytes - total,
 421                               pos + total);
 422                 if (done < 0) {
 423                         ret = -1;
 424                         goto out;
 425                 }
 426                 total += done;
 427         }
 428 out:
 429         free(inbuf);
 430         free(outbuf);
 431         return ret;
 432 }
 433
 434 enum loop_response {
 435         LOOP_STOP,
 436         LOOP_CONTINUE,
 437         LOOP_DONTASK
 438 };
 439
 440 static enum loop_response ask_to_continue(const char *file)
 441 {
 442         char buf[2];
 443         char *ret;
 444
 445         printf("We seem to be looping a lot on %s, do you want to keep going "
 446                "on ? (y/N/a): ", file);
 447 again:
 448         ret = fgets(buf, 2, stdin);
 449         if (*ret == '\n' || tolower(*ret) == 'n')
 450                 return LOOP_STOP;
 451         if (tolower(*ret) == 'a')
 452                 return LOOP_DONTASK;
 453         if (tolower(*ret) != 'y') {
 454                 printf("Please enter one of 'y', 'n', or 'a': ");
 455                 goto again;
 456         }
 457
 458         return LOOP_CONTINUE;
 459 }
 460
 461
 462 static int set_file_xattrs(struct btrfs_root *root, u64 inode,
 463                            int fd, const char *file_name)
 464 {
 465         struct btrfs_key key;
 466         struct btrfs_path path;
 467         struct extent_buffer *leaf;
 468         struct btrfs_dir_item *di;
 469         u32 name_len = 0;
 470         u32 data_len = 0;
 471         u32 len = 0;
 472         u32 cur, total_len;
 473         char *name = NULL;
 474         char *data = NULL;
 475         int ret = 0;
 476
 477         btrfs_init_path(&path);
 478         key.objectid = inode;
 479         key.type = BTRFS_XATTR_ITEM_KEY;
 480         key.offset = 0;
 481         ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
 482         if (ret < 0)
 483                 goto out;
 484
 485         leaf = path.nodes[0];
 486         while (1) {
 487                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
 488                         do {
 489                                 ret = next_leaf(root, &path);
 490                                 if (ret < 0) {
 491                                         error("searching for extended attributes: %d",
 492                                                 ret);
 493                                         goto out;
 494                                 } else if (ret) {
 495                                         /* No more leaves to search */
 496                                         ret = 0;
 497                                         goto out;
 498                                 }
 499                                 leaf = path.nodes[0];
 500                         } while (!leaf);
 501                         continue;
 502                 }
 503
 504                 btrfs_item_key_to_cpu(leaf, &key, path.slots[0]);
 505                 if (key.type != BTRFS_XATTR_ITEM_KEY || key.objectid != inode)
 506                         break;
 507                 cur = 0;
 508                 total_len = btrfs_item_size_nr(leaf, path.slots[0]);
 509                 di = btrfs_item_ptr(leaf, path.slots[0],
 510                                     struct btrfs_dir_item);
 511
 512                 while (cur < total_len) {
 513                         len = btrfs_dir_name_len(leaf, di);
 514                         if (len > name_len) {
 515                                 free(name);
 516                                 name = (char *) malloc(len + 1);
 517                                 if (!name) {
 518                                         ret = -ENOMEM;
 519                                         goto out;
 520                                 }
 521                         }
 522                         read_extent_buffer(leaf, name,
 523                                            (unsigned long)(di + 1), len);
 524                         name[len] = '\0';
 525                         name_len = len;
 526
 527                         len = btrfs_dir_data_len(leaf, di);
 528                         if (len > data_len) {
 529                                 free(data);
 530                                 data = (char *) malloc(len);
 531                                 if (!data) {
 532                                         ret = -ENOMEM;
 533                                         goto out;
 534                                 }
 535                         }
 536                         read_extent_buffer(leaf, data,
 537                                            (unsigned long)(di + 1) + name_len,
 538                                            len);
 539                         data_len = len;
 540
 541                         if (fsetxattr(fd, name, data, data_len, 0))
 542                                 error("setting extended attribute %s on file %s: %s",
 543                                         name, file_name, strerror(errno));
 544
 545                         len = sizeof(*di) + name_len + data_len;
 546                         cur += len;
 547                         di = (struct btrfs_dir_item *)((char *)di + len);
 548                 }
 549                 path.slots[0]++;
 550         }
 551         ret = 0;
 552 out:
 553         btrfs_release_path(&path);
 554         free(name);
 555         free(data);
 556
 557         return ret;
 558 }
 559
 560 static int copy_metadata(struct btrfs_root *root, int fd,
 561                 struct btrfs_key *key)
 562 {
 563         struct btrfs_path path;
 564         struct btrfs_inode_item *inode_item;
 565         int ret;
 566
 567         btrfs_init_path(&path);
 568         ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
 569         if (ret == 0) {
 570                 struct btrfs_timespec *bts;
 571                 struct timespec times[2];
 572
 573                 inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
 574                                 struct btrfs_inode_item);
 575
 576                 ret = fchown(fd, btrfs_inode_uid(path.nodes[0], inode_item),
 577                                 btrfs_inode_gid(path.nodes[0], inode_item));
 578                 if (ret) {
 579                         error("failed to change owner: %s", strerror(errno));
 580                         goto out;
 581                 }
 582
 583                 ret = fchmod(fd, btrfs_inode_mode(path.nodes[0], inode_item));
 584                 if (ret) {
 585                         error("failed to change mode: %s", strerror(errno));
 586                         goto out;
 587                 }
 588
 589                 bts = btrfs_inode_atime(inode_item);
 590                 times[0].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 591                 times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 592
 593                 bts = btrfs_inode_mtime(inode_item);
 594                 times[1].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 595                 times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 596
 597                 ret = futimens(fd, times);
 598                 if (ret) {
 599                         error("failed to set times: %s", strerror(errno));
 600                         goto out;
 601                 }
 602         }
 603 out:
 604         btrfs_release_path(&path);
 605         return ret;
 606 }
 607
 608 static int copy_file(struct btrfs_root *root, int fd, struct btrfs_key *key,
 609                      const char *file)
 610 {
 611         struct extent_buffer *leaf;
 612         struct btrfs_path path;
 613         struct btrfs_file_extent_item *fi;
 614         struct btrfs_inode_item *inode_item;
 615         struct btrfs_timespec *bts;
 616         struct btrfs_key found_key;
 617         int ret;
 618         int extent_type;
 619         int compression;
 620         int loops = 0;
 621         u64 found_size = 0;
 622         struct timespec times[2];
 623         int times_ok = 0;
 624
 625         btrfs_init_path(&path);
 626         ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
 627         if (ret == 0) {
 628                 inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
 629                                     struct btrfs_inode_item);
 630                 found_size = btrfs_inode_size(path.nodes[0], inode_item);
 631
 632                 if (restore_metadata) {
 633                         /*
 634                          * Change the ownership and mode now, set times when
 635                          * copyout is finished.
 636                          */
 637
 638                         ret = fchown(fd, btrfs_inode_uid(path.nodes[0], inode_item),
 639                                         btrfs_inode_gid(path.nodes[0], inode_item));
 640                         if (ret && !ignore_errors)
 641                                 goto out;
 642
 643                         ret = fchmod(fd, btrfs_inode_mode(path.nodes[0], inode_item));
 644                         if (ret && !ignore_errors)
 645                                 goto out;
 646
 647                         bts = btrfs_inode_atime(inode_item);
 648                         times[0].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 649                         times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 650
 651                         bts = btrfs_inode_mtime(inode_item);
 652                         times[1].tv_sec = btrfs_timespec_sec(path.nodes[0], bts);
 653                         times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 654                         times_ok = 1;
 655                 }
 656         }
 657         btrfs_release_path(&path);
 658
 659         key->offset = 0;
 660         key->type = BTRFS_EXTENT_DATA_KEY;
 661
 662         ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
 663         if (ret < 0) {
 664                 error("searching extent data returned %d", ret);
 665                 goto out;
 666         }
 667
 668         leaf = path.nodes[0];
 669         while (!leaf) {
 670                 ret = next_leaf(root, &path);
 671                 if (ret < 0) {
 672                         error("cannot get next leaf: %d", ret);
 673                         goto out;
 674                 } else if (ret > 0) {
 675                         /* No more leaves to search */
 676                         ret = 0;
 677                         goto out;
 678                 }
 679                 leaf = path.nodes[0];
 680         }
 681
 682         while (1) {
 683                 if (loops >= 0 && loops++ >= 1024) {
 684                         enum loop_response resp;
 685
 686                         resp = ask_to_continue(file);
 687                         if (resp == LOOP_STOP)
 688                                 break;
 689                         else if (resp == LOOP_CONTINUE)
 690                                 loops = 0;
 691                         else if (resp == LOOP_DONTASK)
 692                                 loops = -1;
 693                 }
 694                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
 695                         do {
 696                                 ret = next_leaf(root, &path);
 697                                 if (ret < 0) {
 698                                         fprintf(stderr, "Error searching %d\n", ret);
 699                                         goto out;
 700                                 } else if (ret) {
 701                                         /* No more leaves to search */
 702                                         btrfs_release_path(&path);
 703                                         goto set_size;
 704                                 }
 705                                 leaf = path.nodes[0];
 706                         } while (!leaf);
 707                         continue;
 708                 }
 709                 btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
 710                 if (found_key.objectid != key->objectid)
 711                         break;
 712                 if (found_key.type != key->type)
 713                         break;
 714                 fi = btrfs_item_ptr(leaf, path.slots[0],
 715                                     struct btrfs_file_extent_item);
 716                 extent_type = btrfs_file_extent_type(leaf, fi);
 717                 compression = btrfs_file_extent_compression(leaf, fi);
 718                 if (compression >= BTRFS_COMPRESS_LAST) {
 719                         warning("compression type %d not supported",
 720                                 compression);
 721                         ret = -1;
 722                         goto out;
 723                 }
 724
 725                 if (extent_type == BTRFS_FILE_EXTENT_PREALLOC)
 726                         goto next;
 727                 if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
 728                         ret = copy_one_inline(root, fd, &path, found_key.offset);
 729                         if (ret)
 730                                 goto out;
 731                 } else if (extent_type == BTRFS_FILE_EXTENT_REG) {
 732                         ret = copy_one_extent(root, fd, leaf, fi,
 733                                               found_key.offset);
 734                         if (ret)
 735                                 goto out;
 736                 } else {
 737                         warning("weird extent type %d", extent_type);
 738                 }
 739 next:
 740                 path.slots[0]++;
 741         }
 742
 743         btrfs_release_path(&path);
 744 set_size:
 745         if (found_size) {
 746                 ret = ftruncate(fd, (loff_t)found_size);
 747                 if (ret)
 748                         return ret;
 749         }
 750         if (get_xattrs) {
 751                 ret = set_file_xattrs(root, key->objectid, fd, file);
 752                 if (ret)
 753                         return ret;
 754         }
 755         if (restore_metadata && times_ok) {
 756                 ret = futimens(fd, times);
 757                 if (ret)
 758                         return ret;
 759         }
 760         return 0;
 761
 762 out:
 763         btrfs_release_path(&path);
 764         return ret;
 765 }
 766
 767 /*
 768  * returns:
 769  *  0 if the file exists and should be skipped.
 770  *  1 if the file does NOT exist
 771  *  2 if the file exists but is OK to overwrite
 772  */
 773 static int overwrite_ok(const char * path)
 774 {
 775         static int warn = 0;
 776         struct stat st;
 777         int ret;
 778
 779         /* don't be fooled by symlinks */
 780         ret = fstatat(-1, path_name, &st, AT_SYMLINK_NOFOLLOW);
 781
 782         if (!ret) {
 783                 if (overwrite)
 784                         return 2;
 785
 786                 if (verbose || !warn)
 787                         printf("Skipping existing file"
 788                                    " %s\n", path);
 789                 if (!warn)
 790                         printf("If you wish to overwrite use -o\n");
 791                 warn = 1;
 792                 return 0;
 793         }
 794         return 1;
 795 }
 796
 797 static int copy_symlink(struct btrfs_root *root, struct btrfs_key *key,
 798                      const char *file)
 799 {
 800         struct btrfs_path path;
 801         struct extent_buffer *leaf;
 802         struct btrfs_file_extent_item *extent_item;
 803         struct btrfs_inode_item *inode_item;
 804         u32 len;
 805         u32 name_offset;
 806         int ret;
 807         struct btrfs_timespec *bts;
 808         struct timespec times[2];
 809
 810         ret = overwrite_ok(path_name);
 811         if (ret == 0)
 812             return 0; /* skip this file */
 813
 814         /* symlink() can't overwrite, so unlink first */
 815         if (ret == 2) {
 816                 ret = unlink(path_name);
 817                 if (ret) {
 818                         fprintf(stderr, "failed to unlink '%s' for overwrite\n",
 819                                         path_name);
 820                         return ret;
 821                 }
 822         }
 823
 824         btrfs_init_path(&path);
 825         key->type = BTRFS_EXTENT_DATA_KEY;
 826         key->offset = 0;
 827         ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
 828         if (ret < 0)
 829                 goto out;
 830
 831         leaf = path.nodes[0];
 832         if (!leaf) {
 833                 fprintf(stderr, "Error getting leaf for symlink '%s'\n", file);
 834                 ret = -1;
 835                 goto out;
 836         }
 837
 838         extent_item = btrfs_item_ptr(leaf, path.slots[0],
 839                         struct btrfs_file_extent_item);
 840
 841         len = btrfs_file_extent_inline_item_len(leaf,
 842                         btrfs_item_nr(path.slots[0]));
 843         if (len >= PATH_MAX) {
 844                 fprintf(stderr, "Symlink '%s' target length %d is longer than PATH_MAX\n",
 845                                 fs_name, len);
 846                 ret = -1;
 847                 goto out;
 848         }
 849
 850         name_offset = (unsigned long) extent_item
 851                         + offsetof(struct btrfs_file_extent_item, disk_bytenr);
 852         read_extent_buffer(leaf, symlink_target, name_offset, len);
 853
 854         symlink_target[len] = 0;
 855
 856         if (!dry_run) {
 857                 ret = symlink(symlink_target, path_name);
 858                 if (ret < 0) {
 859                         fprintf(stderr, "Failed to restore symlink '%s': %s\n",
 860                                         path_name, strerror(errno));
 861                         goto out;
 862                 }
 863         }
 864         printf("SYMLINK: '%s' => '%s'\n", path_name, symlink_target);
 865
 866         ret = 0;
 867         if (!restore_metadata)
 868                 goto out;
 869
 870         /*
 871          * Symlink metadata operates differently than files/directories, so do
 872          * our own work here.
 873          */
 874         key->type = BTRFS_INODE_ITEM_KEY;
 875         key->offset = 0;
 876
 877         btrfs_release_path(&path);
 878
 879         ret = btrfs_lookup_inode(NULL, root, &path, key, 0);
 880         if (ret) {
 881                 fprintf(stderr, "Failed to lookup inode for '%s'\n", file);
 882                 goto out;
 883         }
 884
 885         inode_item = btrfs_item_ptr(path.nodes[0], path.slots[0],
 886                         struct btrfs_inode_item);
 887
 888         ret = fchownat(-1, file, btrfs_inode_uid(path.nodes[0], inode_item),
 889                                    btrfs_inode_gid(path.nodes[0], inode_item),
 890                                    AT_SYMLINK_NOFOLLOW);
 891         if (ret) {
 892                 fprintf(stderr, "Failed to change owner: %s\n",
 893                                 strerror(errno));
 894                 goto out;
 895         }
 896
 897         bts = btrfs_inode_atime(inode_item);
 898         times[0].tv_sec  = btrfs_timespec_sec(path.nodes[0], bts);
 899         times[0].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 900
 901         bts = btrfs_inode_mtime(inode_item);
 902         times[1].tv_sec  = btrfs_timespec_sec(path.nodes[0], bts);
 903         times[1].tv_nsec = btrfs_timespec_nsec(path.nodes[0], bts);
 904
 905         ret = utimensat(-1, file, times, AT_SYMLINK_NOFOLLOW);
 906         if (ret)
 907                 fprintf(stderr, "Failed to set times: %s\n", strerror(errno));
 908 out:
 909         btrfs_release_path(&path);
 910         return ret;
 911 }
 912
 913 static int search_dir(struct btrfs_root *root, struct btrfs_key *key,
 914                       const char *output_rootdir, const char *in_dir,
 915                       const regex_t *mreg)
 916 {
 917         struct btrfs_path path;
 918         struct extent_buffer *leaf;
 919         struct btrfs_dir_item *dir_item;
 920         struct btrfs_key found_key, location;
 921         char filename[BTRFS_NAME_LEN + 1];
 922         unsigned long name_ptr;
 923         int name_len;
 924         int ret = 0;
 925         int fd;
 926         int loops = 0;
 927         u8 type;
 928
 929         btrfs_init_path(&path);
 930         key->offset = 0;
 931         key->type = BTRFS_DIR_INDEX_KEY;
 932         ret = btrfs_search_slot(NULL, root, key, &path, 0, 0);
 933         if (ret < 0) {
 934                 fprintf(stderr, "Error searching %d\n", ret);
 935                 goto out;
 936         }
 937
 938         ret = 0;
 939
 940         leaf = path.nodes[0];
 941         while (!leaf) {
 942                 if (verbose > 1)
 943                         printf("No leaf after search, looking for the next "
 944                                "leaf\n");
 945                 ret = next_leaf(root, &path);
 946                 if (ret < 0) {
 947                         fprintf(stderr, "Error getting next leaf %d\n",
 948                                 ret);
 949                         goto out;
 950                 } else if (ret > 0) {
 951                         /* No more leaves to search */
 952                         if (verbose)
 953                                 printf("Reached the end of the tree looking "
 954                                        "for the directory\n");
 955                         ret = 0;
 956                         goto out;
 957                 }
 958                 leaf = path.nodes[0];
 959         }
 960
 961         while (leaf) {
 962                 if (loops++ >= 1024) {
 963                         printf("We have looped trying to restore files in %s "
 964                                "too many times to be making progress, "
 965                                "stopping\n", in_dir);
 966                         break;
 967                 }
 968
 969                 if (path.slots[0] >= btrfs_header_nritems(leaf)) {
 970                         do {
 971                                 ret = next_leaf(root, &path);
 972                                 if (ret < 0) {
 973                                         fprintf(stderr, "Error searching %d\n",
 974                                                 ret);
 975                                         goto out;
 976                                 } else if (ret > 0) {
 977                                         /* No more leaves to search */
 978                                         if (verbose)
 979                                                 printf("Reached the end of "
 980                                                        "the tree searching the"
 981                                                        " directory\n");
 982                                         ret = 0;
 983                                         goto out;
 984                                 }
 985                                 leaf = path.nodes[0];
 986                         } while (!leaf);
 987                         continue;
 988                 }
 989                 btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
 990                 if (found_key.objectid != key->objectid) {
 991                         if (verbose > 1)
 992                                 printf("Found objectid=%Lu, key=%Lu\n",
 993                                        found_key.objectid, key->objectid);
 994                         break;
 995                 }
 996                 if (found_key.type != key->type) {
 997                         if (verbose > 1)
 998                                 printf("Found type=%u, want=%u\n",
 999                                        found_key.type, key->type);
1000                         break;
1001                 }
1002                 dir_item = btrfs_item_ptr(leaf, path.slots[0],
1003                                           struct btrfs_dir_item);
1004                 name_ptr = (unsigned long)(dir_item + 1);
1005                 name_len = btrfs_dir_name_len(leaf, dir_item);
1006                 read_extent_buffer(leaf, filename, name_ptr, name_len);
1007                 filename[name_len] = '\0';
1008                 type = btrfs_dir_type(leaf, dir_item);
1009                 btrfs_dir_item_key_to_cpu(leaf, dir_item, &location);
1010
1011                 /* full path from root of btrfs being restored */
1012                 snprintf(fs_name, PATH_MAX, "%s/%s", in_dir, filename);
1013
1014                 if (mreg && REG_NOMATCH == regexec(mreg, fs_name, 0, NULL, 0))
1015                         goto next;
1016
1017                 /* full path from system root */
1018                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, fs_name);
1019
1020                 /*
1021                  * Restore directories, files, symlinks and metadata.
1022                  */
1023                 if (type == BTRFS_FT_REG_FILE) {
1024                         if (!overwrite_ok(path_name))
1025                                 goto next;
1026
1027                         if (verbose)
1028                                 printf("Restoring %s\n", path_name);
1029                         if (dry_run)
1030                                 goto next;
1031                         fd = open(path_name, O_CREAT|O_WRONLY, 0644);
1032                         if (fd < 0) {
1033                                 fprintf(stderr, "Error creating %s: %d\n",
1034                                         path_name, errno);
1035                                 if (ignore_errors)
1036                                         goto next;
1037                                 ret = -1;
1038                                 goto out;
1039                         }
1040                         loops = 0;
1041                         ret = copy_file(root, fd, &location, path_name);
1042                         close(fd);
1043                         if (ret) {
1044                                 fprintf(stderr, "Error copying data for %s\n",
1045                                         path_name);
1046                                 if (ignore_errors)
1047                                         goto next;
1048                                 goto out;
1049                         }
1050                 } else if (type == BTRFS_FT_DIR) {
1051                         struct btrfs_root *search_root = root;
1052                         char *dir = strdup(fs_name);
1053
1054                         if (!dir) {
1055                                 fprintf(stderr, "Ran out of memory\n");
1056                                 ret = -ENOMEM;
1057                                 goto out;
1058                         }
1059
1060                         if (location.type == BTRFS_ROOT_ITEM_KEY) {
1061                                 /*
1062                                  * If we are a snapshot and this is the index
1063                                  * object to ourselves just skip it.
1064                                  */
1065                                 if (location.objectid ==
1066                                     root->root_key.objectid) {
1067                                         free(dir);
1068                                         goto next;
1069                                 }
1070
1071                                 location.offset = (u64)-1;
1072                                 search_root = btrfs_read_fs_root(root->fs_info,
1073                                                                  &location);
1074                                 if (IS_ERR(search_root)) {
1075                                         free(dir);
1076                                         fprintf(stderr, "Error reading "
1077                                                 "subvolume %s: %lu\n",
1078                                                 path_name,
1079                                                 PTR_ERR(search_root));
1080                                         if (ignore_errors)
1081                                                 goto next;
1082                                         ret = PTR_ERR(search_root);
1083                                         goto out;
1084                                 }
1085
1086                                 /*
1087                                  * A subvolume will have a key.offset of 0, a
1088                                  * snapshot will have key.offset of a transid.
1089                                  */
1090                                 if (search_root->root_key.offset != 0 &&
1091                                     get_snaps == 0) {
1092                                         free(dir);
1093                                         printf("Skipping snapshot %s\n",
1094                                                filename);
1095                                         goto next;
1096                                 }
1097                                 location.objectid = BTRFS_FIRST_FREE_OBJECTID;
1098                         }
1099
1100                         if (verbose)
1101                                 printf("Restoring %s\n", path_name);
1102
1103                         errno = 0;
1104                         if (dry_run)
1105                                 ret = 0;
1106                         else
1107                                 ret = mkdir(path_name, 0755);
1108                         if (ret && errno != EEXIST) {
1109                                 free(dir);
1110                                 fprintf(stderr, "Error mkdiring %s: %d\n",
1111                                         path_name, errno);
1112                                 if (ignore_errors)
1113                                         goto next;
1114                                 ret = -1;
1115                                 goto out;
1116                         }
1117                         loops = 0;
1118                         ret = search_dir(search_root, &location,
1119                                          output_rootdir, dir, mreg);
1120                         free(dir);
1121                         if (ret) {
1122                                 fprintf(stderr, "Error searching %s\n",
1123                                         path_name);
1124                                 if (ignore_errors)
1125                                         goto next;
1126                                 goto out;
1127                         }
1128                 } else if (type == BTRFS_FT_SYMLINK) {
1129                         if (restore_symlinks)
1130                                 ret = copy_symlink(root, &location, path_name);
1131                         if (ret < 0) {
1132                                 if (ignore_errors)
1133                                         goto next;
1134                                 btrfs_release_path(&path);
1135                                 return ret;
1136                         }
1137                 }
1138 next:
1139                 path.slots[0]++;
1140         }
1141
1142         if (restore_metadata) {
1143                 snprintf(path_name, PATH_MAX, "%s%s", output_rootdir, in_dir);
1144                 fd = open(path_name, O_RDONLY);
1145                 if (fd < 0) {
1146                         fprintf(stderr, "ERROR: Failed to access %s to restore metadata\n",
1147                                         path_name);
1148                         if (!ignore_errors) {
1149                                 ret = -1;
1150                                 goto out;
1151                         }
1152                 } else {
1153                         /*
1154                          * Set owner/mode/time on the directory as well
1155                          */
1156                         key->type = BTRFS_INODE_ITEM_KEY;
1157                         ret = copy_metadata(root, fd, key);
1158                         close(fd);
1159                         if (ret && !ignore_errors)
1160                                 goto out;
1161                 }
1162         }
1163
1164         if (verbose)
1165                 printf("Done searching %s\n", in_dir);
1166 out:
1167         btrfs_release_path(&path);
1168         return ret;
1169 }
1170
1171 static int do_list_roots(struct btrfs_root *root)
1172 {
1173         struct btrfs_key key;
1174         struct btrfs_key found_key;
1175         struct btrfs_disk_key disk_key;
1176         struct btrfs_path path;
1177         struct extent_buffer *leaf;
1178         struct btrfs_root_item ri;
1179         unsigned long offset;
1180         int slot;
1181         int ret;
1182
1183         root = root->fs_info->tree_root;
1184
1185         btrfs_init_path(&path);
1186         key.offset = 0;
1187         key.objectid = 0;
1188         key.type = BTRFS_ROOT_ITEM_KEY;
1189         ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
1190         if (ret < 0) {
1191                 fprintf(stderr, "Failed to do search %d\n", ret);
1192                 btrfs_release_path(&path);
1193                 return -1;
1194         }
1195
1196         leaf = path.nodes[0];
1197
1198         while (1) {
1199                 slot = path.slots[0];
1200                 if (slot >= btrfs_header_nritems(leaf)) {
1201                         ret = btrfs_next_leaf(root, &path);
1202                         if (ret)
1203                                 break;
1204                         leaf = path.nodes[0];
1205                         slot = path.slots[0];
1206                 }
1207                 btrfs_item_key(leaf, &disk_key, slot);
1208                 btrfs_disk_key_to_cpu(&found_key, &disk_key);
1209                 if (found_key.type != BTRFS_ROOT_ITEM_KEY) {
1210                         path.slots[0]++;
1211                         continue;
1212                 }
1213
1214                 offset = btrfs_item_ptr_offset(leaf, slot);
1215                 read_extent_buffer(leaf, &ri, offset, sizeof(ri));
1216                 printf(" tree ");
1217                 btrfs_print_key(&disk_key);
1218                 printf(" %Lu level %d\n", btrfs_root_bytenr(&ri),
1219                        btrfs_root_level(&ri));
1220                 path.slots[0]++;
1221         }
1222         btrfs_release_path(&path);
1223
1224         return 0;
1225 }
1226
1227 static struct btrfs_root *open_fs(const char *dev, u64 root_location,
1228                                   int super_mirror, int list_roots)
1229 {
1230         struct btrfs_fs_info *fs_info = NULL;
1231         struct btrfs_root *root = NULL;
1232         u64 bytenr;
1233         int i;
1234
1235         for (i = super_mirror; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1236                 bytenr = btrfs_sb_offset(i);
1237                 fs_info = open_ctree_fs_info(dev, bytenr, root_location, 0,
1238                                              OPEN_CTREE_PARTIAL);
1239                 if (fs_info)
1240                         break;
1241                 fprintf(stderr, "Could not open root, trying backup super\n");
1242         }
1243
1244         if (!fs_info)
1245                 return NULL;
1246
1247         /*
1248          * All we really need to succeed is reading the chunk tree, everything
1249          * else we can do by hand, since we only need to read the tree root and
1250          * the fs_root.
1251          */
1252         if (!extent_buffer_uptodate(fs_info->tree_root->node)) {
1253                 u64 generation;
1254
1255                 root = fs_info->tree_root;
1256                 if (!root_location)
1257                         root_location = btrfs_super_root(fs_info->super_copy);
1258                 generation = btrfs_super_generation(fs_info->super_copy);
1259                 root->node = read_tree_block(fs_info, root_location,
1260                                              fs_info->nodesize, generation);
1261                 if (!extent_buffer_uptodate(root->node)) {
1262                         fprintf(stderr, "Error opening tree root\n");
1263                         close_ctree(root);
1264                         return NULL;
1265                 }
1266         }
1267
1268         if (!list_roots && !fs_info->fs_root) {
1269                 struct btrfs_key key;
1270
1271                 key.objectid = BTRFS_FS_TREE_OBJECTID;
1272                 key.type = BTRFS_ROOT_ITEM_KEY;
1273                 key.offset = (u64)-1;
1274                 fs_info->fs_root = btrfs_read_fs_root_no_cache(fs_info, &key);
1275                 if (IS_ERR(fs_info->fs_root)) {
1276                         fprintf(stderr, "Couldn't read fs root: %ld\n",
1277                                 PTR_ERR(fs_info->fs_root));
1278                         close_ctree(fs_info->tree_root);
1279                         return NULL;
1280                 }
1281         }
1282
1283         if (list_roots && do_list_roots(fs_info->tree_root)) {
1284                 close_ctree(fs_info->tree_root);
1285                 return NULL;
1286         }
1287
1288         return fs_info->fs_root;
1289 }
1290
1291 static int find_first_dir(struct btrfs_root *root, u64 *objectid)
1292 {
1293         struct btrfs_path path;
1294         struct btrfs_key found_key;
1295         struct btrfs_key key;
1296         int ret = -1;
1297         int i;
1298
1299         btrfs_init_path(&path);
1300         key.objectid = 0;
1301         key.type = BTRFS_DIR_INDEX_KEY;
1302         key.offset = 0;
1303         ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
1304         if (ret < 0) {
1305                 fprintf(stderr, "Error searching %d\n", ret);
1306                 goto out;
1307         }
1308
1309         if (!path.nodes[0]) {
1310                 fprintf(stderr, "No leaf!\n");
1311                 goto out;
1312         }
1313 again:
1314         for (i = path.slots[0];
1315              i < btrfs_header_nritems(path.nodes[0]); i++) {
1316                 btrfs_item_key_to_cpu(path.nodes[0], &found_key, i);
1317                 if (found_key.type != key.type)
1318                         continue;
1319
1320                 printf("Using objectid %Lu for first dir\n",
1321                        found_key.objectid);
1322                 *objectid = found_key.objectid;
1323                 ret = 0;
1324                 goto out;
1325         }
1326         do {
1327                 ret = next_leaf(root, &path);
1328                 if (ret < 0) {
1329                         fprintf(stderr, "Error getting next leaf %d\n",
1330                                 ret);
1331                         goto out;
1332                 } else if (ret > 0) {
1333                         fprintf(stderr, "No more leaves\n");
1334                         goto out;
1335                 }
1336         } while (!path.nodes[0]);
1337         if (path.nodes[0])
1338                 goto again;
1339         printf("Couldn't find a dir index item\n");
1340 out:
1341         btrfs_release_path(&path);
1342         return ret;
1343 }
1344
1345 const char * const cmd_restore_usage[] = {
1346         "btrfs restore [options] <device> <path> | -l <device>",
1347         "Try to restore files from a damaged filesystem (unmounted)",
1348         "",
1349         "-s|--snapshots       get snapshots",
1350         "-x|--xattr           restore extended attributes",
1351         "-m|--metadata        restore owner, mode and times",
1352         "-S|--symlink         restore symbolic links",
1353         "-v|--verbose         verbose",
1354         "-i|--ignore-errors   ignore errors",
1355         "-o|--overwrite       overwrite",
1356         "-t <bytenr>          tree location",
1357         "-f <bytenr>          filesystem location",
1358         "-u|--super <mirror>  super mirror",
1359         "-r|--root <rootid>   root objectid",
1360         "-d                   find dir",
1361         "-l|--list-roots      list tree roots",
1362         "-D|--dry-run         dry run (only list files that would be recovered)",
1363         "--path-regex <regex>",
1364         "                     restore only filenames matching regex,",
1365         "                     you have to use following syntax (possibly quoted):",
1366         "                     ^/(|home(|/username(|/Desktop(|/.*))))$",
1367         "-c                   ignore case (--path-regex only)",
1368         NULL
1369 };
1370
1371 int cmd_restore(int argc, char **argv)
1372 {
1373         struct btrfs_root *root;
1374         struct btrfs_key key;
1375         char dir_name[PATH_MAX];
1376         u64 tree_location = 0;
1377         u64 fs_location = 0;
1378         u64 root_objectid = 0;
1379         int len;
1380         int ret;
1381         int super_mirror = 0;
1382         int find_dir = 0;
1383         int list_roots = 0;
1384         const char *match_regstr = NULL;
1385         int match_cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
1386         regex_t match_reg, *mreg = NULL;
1387         char reg_err[256];
1388
1389         while (1) {
1390                 int opt;
1391                 enum { GETOPT_VAL_PATH_REGEX = 256 };
1392                 static const struct option long_options[] = {
1393                         { "path-regex", required_argument, NULL,
1394                                 GETOPT_VAL_PATH_REGEX },
1395                         { "dry-run", no_argument, NULL, 'D'},
1396                         { "metadata", no_argument, NULL, 'm'},
1397                         { "symlinks", no_argument, NULL, 'S'},
1398                         { "snapshots", no_argument, NULL, 's'},
1399                         { "xattr", no_argument, NULL, 'x'},
1400                         { "verbose", no_argument, NULL, 'v'},
1401                         { "ignore-errors", no_argument, NULL, 'i'},
1402                         { "overwrite", no_argument, NULL, 'o'},
1403                         { "super", required_argument, NULL, 'u'},
1404                         { "root", required_argument, NULL, 'r'},
1405                         { "list-roots", no_argument, NULL, 'l'},
1406                         { NULL, 0, NULL, 0}
1407                 };
1408
1409                 opt = getopt_long(argc, argv, "sSxviot:u:dmf:r:lDc", long_options,
1410                                         NULL);
1411                 if (opt < 0)
1412                         break;
1413
1414                 switch (opt) {
1415                         case 's':
1416                                 get_snaps = 1;
1417                                 break;
1418                         case 'v':
1419                                 verbose++;
1420                                 break;
1421                         case 'i':
1422                                 ignore_errors = 1;
1423                                 break;
1424                         case 'o':
1425                                 overwrite = 1;
1426                                 break;
1427                         case 't':
1428                                 tree_location = arg_strtou64(optarg);
1429                                 break;
1430                         case 'f':
1431                                 fs_location = arg_strtou64(optarg);
1432                                 break;
1433                         case 'u':
1434                                 super_mirror = arg_strtou64(optarg);
1435                                 if (super_mirror >= BTRFS_SUPER_MIRROR_MAX) {
1436                                         fprintf(stderr, "Super mirror not "
1437                                                 "valid\n");
1438                                         exit(1);
1439                                 }
1440                                 break;
1441                         case 'd':
1442                                 find_dir = 1;
1443                                 break;
1444                         case 'r':
1445                                 root_objectid = arg_strtou64(optarg);
1446                                 if (!is_fstree(root_objectid)) {
1447                                         fprintf(stderr, "objectid %llu is not a valid fs/file tree\n",
1448                                                         root_objectid);
1449                                         exit(1);
1450                                 }
1451                                 break;
1452                         case 'l':
1453                                 list_roots = 1;
1454                                 break;
1455                         case 'm':
1456                                 restore_metadata = 1;
1457                                 break;
1458                         case 'S':
1459                                 restore_symlinks = 1;
1460                                 break;
1461                         case 'D':
1462                                 dry_run = 1;
1463                                 break;
1464                         case 'c':
1465                                 match_cflags |= REG_ICASE;
1466                                 break;
1467                         case GETOPT_VAL_PATH_REGEX:
1468                                 match_regstr = optarg;
1469                                 break;
1470                         case 'x':
1471                                 get_xattrs = 1;
1472                                 break;
1473                         default:
1474                                 usage(cmd_restore_usage);
1475                 }
1476         }
1477
1478         if (!list_roots && check_argc_min(argc - optind, 2))
1479                 usage(cmd_restore_usage);
1480         else if (list_roots && check_argc_min(argc - optind, 1))
1481                 usage(cmd_restore_usage);
1482
1483         if (fs_location && root_objectid) {
1484                 fprintf(stderr, "don't use -f and -r at the same time.\n");
1485                 return 1;
1486         }
1487
1488         if ((ret = check_mounted(argv[optind])) < 0) {
1489                 fprintf(stderr, "Could not check mount status: %s\n",
1490                         strerror(-ret));
1491                 return 1;
1492         } else if (ret) {
1493                 fprintf(stderr, "%s is currently mounted.  Aborting.\n", argv[optind]);
1494                 return 1;
1495         }
1496
1497         root = open_fs(argv[optind], tree_location, super_mirror, list_roots);
1498         if (root == NULL)
1499                 return 1;
1500
1501         if (list_roots)
1502                 goto out;
1503
1504         if (fs_location != 0) {
1505                 free_extent_buffer(root->node);
1506                 root->node = read_tree_block(root->fs_info, fs_location,
1507                                 root->fs_info->nodesize, 0);
1508                 if (!extent_buffer_uptodate(root->node)) {
1509                         fprintf(stderr, "Failed to read fs location\n");
1510                         ret = 1;
1511                         goto out;
1512                 }
1513         }
1514
1515         memset(path_name, 0, PATH_MAX);
1516
1517         if (strlen(argv[optind + 1]) >= PATH_MAX) {
1518                 fprintf(stderr, "ERROR: path too long\n");
1519                 ret = 1;
1520                 goto out;
1521         }
1522         strncpy(dir_name, argv[optind + 1], sizeof dir_name);
1523         dir_name[sizeof dir_name - 1] = 0;
1524
1525         /* Strip the trailing / on the dir name */
1526         len = strlen(dir_name);
1527         while (len && dir_name[--len] == '/') {
1528                 dir_name[len] = '\0';
1529         }
1530
1531         if (root_objectid != 0) {
1532                 struct btrfs_root *orig_root = root;
1533
1534                 key.objectid = root_objectid;
1535                 key.type = BTRFS_ROOT_ITEM_KEY;
1536                 key.offset = (u64)-1;
1537                 root = btrfs_read_fs_root(orig_root->fs_info, &key);
1538                 if (IS_ERR(root)) {
1539                         fprintf(stderr, "fail to read root %llu: %s\n",
1540                                         root_objectid, strerror(-PTR_ERR(root)));
1541                         root = orig_root;
1542                         ret = 1;
1543                         goto out;
1544                 }
1545                 key.type = 0;
1546                 key.offset = 0;
1547         }
1548
1549         if (find_dir) {
1550                 ret = find_first_dir(root, &key.objectid);
1551                 if (ret)
1552                         goto out;
1553         } else {
1554                 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
1555         }
1556
1557         if (match_regstr) {
1558                 ret = regcomp(&match_reg, match_regstr, match_cflags);
1559                 if (ret) {
1560                         regerror(ret, &match_reg, reg_err, sizeof(reg_err));
1561                         fprintf(stderr, "Regex compile failed: %s\n", reg_err);
1562                         goto out;
1563                 }
1564                 mreg = &match_reg;
1565         }
1566
1567         if (dry_run)
1568                 printf("This is a dry-run, no files are going to be restored\n");
1569
1570         ret = search_dir(root, &key, dir_name, "", mreg);
1571
1572 out:
1573         if (mreg)
1574                 regfree(mreg);
1575         close_ctree(root);
1576         return !!ret;
1577 }