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 #define _XOPEN_SOURCE 500
  20 #define _GNU_SOURCE 1
  21
  22 #include "kerncompat.h"
  23
  24 #include <ctype.h>
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <fcntl.h>
  29 #include <sys/stat.h>
  30 #include <sys/types.h>
  31 #include <lzo/lzoconf.h>
  32 #include <lzo/lzo1x.h>
  33 #include <zlib.h>
  34 #include <regex.h>
  35 #include <getopt.h>
  36 #include <sys/types.h>
  37 #include <sys/xattr.h>
  38
  39 #include "ctree.h"
  40 #include "disk-io.h"
  41 #include "print-tree.h"
  42 #include "transaction.h"
  43 #include "list.h"
  44 #include "version.h"
  45 #include "volumes.h"
  46 #include "utils.h"
  47 #include "commands.h"
  48
  49 static char fs_name[4096];
  50 static char path_name[4096];
  51 static int get_snaps = 0;
  52 static int verbose = 0;
  53 static int ignore_errors = 0;
  54 static int overwrite = 0;
  55 static int get_xattrs = 0;
  56 static int dry_run = 0;
  57
  58 #define LZO_LEN 4
  59 #define PAGE_CACHE_SIZE 4096
  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                 fprintf(stderr, "inflate init returnd %d\n", 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                 fprintf(stderr, "failed to inflate: %d\n", 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(unsigned char *inbuf, char *outbuf, u64 compress_len,
  97                           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                 fprintf(stderr, "lzo init returned %d\n", 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                 in_len = read_compress_length(inbuf);
 118
 119                 if ((tot_in + LZO_LEN + in_len) > tot_len) {
 120                         fprintf(stderr, "bad compress length %lu\n",
 121                                 (unsigned long)in_len);
 122                         return -1;
 123                 }
 124
 125                 inbuf += LZO_LEN;
 126                 tot_in += LZO_LEN;
 127
 128                 new_len = lzo1x_worst_compress(PAGE_CACHE_SIZE);
 129                 ret = lzo1x_decompress_safe((const unsigned char *)inbuf, in_len,
 130                                             (unsigned char *)outbuf,
 131                                             (void *)&new_len, NULL);
 132                 if (ret != LZO_E_OK) {
 133                         fprintf(stderr, "failed to inflate: %d\n", ret);
 134                         return -1;
 135                 }
 136                 out_len += new_len;
 137                 outbuf += new_len;
 138                 inbuf += in_len;
 139                 tot_in += in_len;
 140         }
 141
 142         *decompress_len = out_len;
 143
 144         return 0;
 145 }
 146
 147 static int decompress(char *inbuf, char *outbuf, u64 compress_len,
 148                       u64 *decompress_len, int compress)
 149 {
 150         switch (compress) {
 151         case BTRFS_COMPRESS_ZLIB:
 152                 return decompress_zlib(inbuf, outbuf, compress_len,
 153                                        *decompress_len);
 154         case BTRFS_COMPRESS_LZO:
 155                 return decompress_lzo((unsigned char *)inbuf, outbuf, compress_len,
 156                                       decompress_len);
 157         default:
 158                 break;
 159         }
 160
 161         fprintf(stderr, "invalid compression type: %d\n", compress);
 162         return -1;
 163 }
 164
 165 static int next_leaf(struct btrfs_root *root, struct btrfs_path *path)
 166 {
 167         int slot;
 168         int level = 1;
 169         int offset = 1;
 170         struct extent_buffer *c;
 171         struct extent_buffer *next = NULL;
 172
 173 again:
 174         for (; level < BTRFS_MAX_LEVEL; level++) {
 175                 if (path->nodes[level])
 176                         break;
 177         }
 178
 179         if (level == BTRFS_MAX_LEVEL)
 180                 return 1;
 181
 182         slot = path->slots[level] + 1;
 183
 184         while(level < BTRFS_MAX_LEVEL) {
 185                 if (!path->nodes[level])
 186                         return 1;
 187
 188                 slot = path->slots[level] + offset;
 189                 c = path->nodes[level];
 190                 if (slot >= btrfs_header_nritems(c)) {
 191                         level++;
 192                         if (level == BTRFS_MAX_LEVEL)
 193                                 return 1;
 194                         continue;
 195                 }
 196
 197                 if (path->reada)
 198                         reada_for_search(root, path, level, slot, 0);
 199
 200                 next = read_node_slot(root, c, slot);
 201                 if (next)
 202                         break;
 203                 offset++;
 204         }
 205         path->slots[level] = slot;
 206         while(1) {
 207                 level--;
 208                 c = path->nodes[level];
 209                 free_extent_buffer(c);
 210                 path->nodes[level] = next;
 211                 path->slots[level] = 0;
 212                 if (!level)
 213                         break;
 214                 if (path->reada)
 215                         reada_for_search(root, path, level, 0, 0);
 216                 next = read_node_slot(root, next, 0);
 217                 if (!next)
 218                         goto again;
 219         }
 220         return 0;
 221 }
 222
 223 static int copy_one_inline(int fd, struct btrfs_path *path, u64 pos)
 224 {
 225         struct extent_buffer *leaf = path->nodes[0];
 226         struct btrfs_file_extent_item *fi;
 227         char buf[4096];
 228         char *outbuf;
 229         u64 ram_size;
 230         ssize_t done;
 231         unsigned long ptr;
 232         int ret;
 233         int len;
 234         int compress;
 235
 236         fi = btrfs_item_ptr(leaf, path->slots[0],
 237                             struct btrfs_file_extent_item);
 238         ptr = btrfs_file_extent_inline_start(fi);
 239         len = btrfs_file_extent_inline_len(leaf, path->slots[0], fi);
 240         read_extent_buffer(leaf, buf, ptr, len);
 241
 242         compress = btrfs_file_extent_compression(leaf, fi);
 243         if (compress == BTRFS_COMPRESS_NONE) {
 244                 done = pwrite(fd, buf, len, pos);
 245                 if (done < len) {
 246                         fprintf(stderr, "Short inline write, wanted %d, did "
 247                                 "%zd: %d\n", len, done, errno);
 248                         return -1;
 249                 }
 250                 return 0;
 251         }
 252
 253         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 254         outbuf = calloc(1, ram_size);
 255         if (!outbuf) {
 256                 fprintf(stderr, "No memory\n");
 257                 return -ENOMEM;
 258         }
 259
 260         ret = decompress(buf, outbuf, len, &ram_size, compress);
 261         if (ret) {
 262                 free(outbuf);
 263                 return ret;
 264         }
 265
 266         done = pwrite(fd, outbuf, ram_size, pos);
 267         free(outbuf);
 268         if (done < ram_size) {
 269                 fprintf(stderr, "Short compressed inline write, wanted %Lu, "
 270                         "did %zd: %d\n", ram_size, done, errno);
 271                 return -1;
 272         }
 273
 274         return 0;
 275 }
 276
 277 static int copy_one_extent(struct btrfs_root *root, int fd,
 278                            struct extent_buffer *leaf,
 279                            struct btrfs_file_extent_item *fi, u64 pos)
 280 {
 281         struct btrfs_multi_bio *multi = NULL;
 282         struct btrfs_device *device;
 283         char *inbuf, *outbuf = NULL;
 284         ssize_t done, total = 0;
 285         u64 bytenr;
 286         u64 ram_size;
 287         u64 disk_size;
 288         u64 num_bytes;
 289         u64 length;
 290         u64 size_left;
 291         u64 dev_bytenr;
 292         u64 offset;
 293         u64 count = 0;
 294         int compress;
 295         int ret;
 296         int dev_fd;
 297         int mirror_num = 1;
 298         int num_copies;
 299
 300         compress = btrfs_file_extent_compression(leaf, fi);
 301         bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
 302         disk_size = btrfs_file_extent_disk_num_bytes(leaf, fi);
 303         ram_size = btrfs_file_extent_ram_bytes(leaf, fi);
 304         offset = btrfs_file_extent_offset(leaf, fi);
 305         num_bytes = btrfs_file_extent_num_bytes(leaf, fi);
 306         size_left = disk_size;
 307         if (compress == BTRFS_COMPRESS_NONE)
 308                 bytenr += offset;
 309
 310         if (verbose && offset)
 311                 printf("offset is %Lu\n", offset);
 312         /* we found a hole */
 313         if (disk_size == 0)
 314                 return 0;
 315
 316         inbuf = malloc(size_left);
 317         if (!inbuf) {
 318                 fprintf(stderr, "No memory\n");
 319                 return -ENOMEM;
 320         }
 321
 322         if (compress != BTRFS_COMPRESS_NONE) {
 323                 outbuf = calloc(1, ram_size);
 324                 if (!outbuf) {
 325                         fprintf(stderr, "No memory\n");
 326                         free(inbuf);
 327                         return -ENOMEM;
 328                 }
 329         }
 330 again:
 331         length = size_left;
 332         ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
 333                               bytenr, &length, &multi, mirror_num, NULL);
 334         if (ret) {
 335                 fprintf(stderr, "Error mapping block %d\n", ret);
 336                 goto out;
 337         }
 338         device = multi->stripes[0].dev;
 339         dev_fd = device->fd;
 340         device->total_ios++;
 341         dev_bytenr = multi->stripes[0].physical;
 342         kfree(multi);
 343
 344         if (size_left < length)
 345                 length = size_left;
 346
 347         done = pread(dev_fd, inbuf+count, length, dev_bytenr);
 348         /* Need both checks, or we miss negative values due to u64 conversion */
 349         if (done < 0 || done < length) {
 350                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 351                                               bytenr, length);
 352                 mirror_num++;
 353                 /* mirror_num is 1-indexed, so num_copies is a valid mirror. */
 354                 if (mirror_num > num_copies) {
 355                         ret = -1;
 356                         fprintf(stderr, "Exhausted mirrors trying to read\n");
 357                         goto out;
 358                 }
 359                 fprintf(stderr, "Trying another mirror\n");
 360                 goto again;
 361         }
 362
 363         mirror_num = 1;
 364         size_left -= length;
 365         count += length;
 366         bytenr += length;
 367         if (size_left)
 368                 goto again;
 369
 370         if (compress == BTRFS_COMPRESS_NONE) {
 371                 while (total < num_bytes) {
 372                         done = pwrite(fd, inbuf+total, num_bytes-total,
 373                                       pos+total);
 374                         if (done < 0) {
 375                                 ret = -1;
 376                                 fprintf(stderr, "Error writing: %d %s\n", errno, strerror(errno));
 377                                 goto out;
 378                         }
 379                         total += done;
 380                 }
 381                 ret = 0;
 382                 goto out;
 383         }
 384
 385         ret = decompress(inbuf, outbuf, disk_size, &ram_size, compress);
 386         if (ret) {
 387                 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
 388                                               bytenr, length);
 389                 mirror_num++;
 390                 if (mirror_num >= num_copies) {
 391                         ret = -1;
 392                         goto out;
 393                 }
 394                 fprintf(stderr, "Trying another mirror\n");
 395                 goto again;
 396         }
 397
 398         while (total < num_bytes) {
 399                 done = pwrite(fd, outbuf + offset + total,
 400                               num_bytes - total,
 401                               pos + total);
 402                 if (done < 0) {
 403                         ret = -1;
 404                         goto out;
 405                 }
 406                 total += done;
 407         }
 408 out:
 409         free(inbuf);
 410         free(outbuf);
 411         return ret;
 412 }
 413
 414 enum loop_response {
 415         LOOP_STOP,
 416         LOOP_CONTINUE,
 417         LOOP_DONTASK
 418 };
 419
 420 static enum loop_response ask_to_continue(const char *file)
 421 {
 422         char buf[2];
 423         char *ret;
 424
 425         printf("We seem to be looping a lot on %s, do you want to keep going "
 426                "on ? (y/N/a): ", file);
 427 again:
 428         ret = fgets(buf, 2, stdin);
 429         if (*ret == '\n' || tolower(*ret) == 'n')
 430                 return LOOP_STOP;
 431         if (tolower(*ret) == 'a')
 432                 return LOOP_DONTASK;
 433         if (tolower(*ret) != 'y') {
 434                 printf("Please enter one of 'y', 'n', or 'a': ");
 435                 goto again;
 436         }
 437
 438         return LOOP_CONTINUE;
 439 }
 440
 441
 442 static int set_file_xattrs(struct btrfs_root *root, u64 inode,
 443                            int fd, const char *file_name)
 444 {
 445         struct btrfs_key key;
 446         struct btrfs_path *path;
 447         struct extent_buffer *leaf;
 448         struct btrfs_dir_item *di;
 449         u32 name_len = 0;
 450         u32 data_len = 0;
 451         u32 len = 0;
 452         u32 cur, total_len;
 453         char *name = NULL;
 454         char *data = NULL;
 455         int ret = 0;
 456
 457         key.objectid = inode;
 458         key.type = BTRFS_XATTR_ITEM_KEY;
 459         key.offset = 0;
 460
 461         path = btrfs_alloc_path();
 462         if (!path)
 463                 return -ENOMEM;
 464
 465         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
 466         if (ret < 0)
 467                 goto out;
 468
 469         leaf = path->nodes[0];
 470         while (1) {
 471                 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
 472                         do {
 473                                 ret = next_leaf(root, path);
 474                                 if (ret < 0) {
 475                                         fprintf(stderr,
 476                                                 "Error searching for extended attributes: %d\n",
 477                                                 ret);
 478                                         goto out;
 479                                 } else if (ret) {
 480                                         /* No more leaves to search */
 481                                         ret = 0;
 482                                         goto out;
 483                                 }
 484                                 leaf = path->nodes[0];
 485                         } while (!leaf);
 486                         continue;
 487                 }
 488
 489                 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
 490                 if (key.type != BTRFS_XATTR_ITEM_KEY || key.objectid != inode)
 491                         break;
 492                 cur = 0;
 493                 total_len = btrfs_item_size_nr(leaf, path->slots[0]);
 494                 di = btrfs_item_ptr(leaf, path->slots[0],
 495                                     struct btrfs_dir_item);
 496
 497                 while (cur < total_len) {
 498                         len = btrfs_dir_name_len(leaf, di);
 499                         if (len > name_len) {
 500                                 free(name);
 501                                 name = (char *) malloc(len + 1);
 502                                 if (!name) {
 503                                         ret = -ENOMEM;
 504                                         goto out;
 505                                 }
 506                         }
 507                         read_extent_buffer(leaf, name,
 508                                            (unsigned long)(di + 1), len);
 509                         name[len] = '\0';
 510                         name_len = len;
 511
 512                         len = btrfs_dir_data_len(leaf, di);
 513                         if (len > data_len) {
 514                                 free(data);
 515                                 data = (char *) malloc(len);
 516                                 if (!data) {
 517                                         ret = -ENOMEM;
 518                                         goto out;
 519                                 }
 520                         }
 521                         read_extent_buffer(leaf, data,
 522                                            (unsigned long)(di + 1) + name_len,
 523                                            len);
 524                         data_len = len;
 525
 526                         if (fsetxattr(fd, name, data, data_len, 0)) {
 527                                 int err = errno;
 528
 529                                 fprintf(stderr,
 530                                         "Error setting extended attribute %s on file %s: %s\n",
 531                                         name, file_name, strerror(err));
 532                         }
 533
 534                         len = sizeof(*di) + name_len + data_len;
 535                         cur += len;
 536                         di = (struct btrfs_dir_item *)((char *)di + len);
 537                 }
 538                 path->slots[0]++;
 539         }
 540         ret = 0;
 541 out:
 542         btrfs_free_path(path);
 543         free(name);
 544         free(data);
 545
 546         return ret;
 547 }
 548
 549
 550 static int copy_file(struct btrfs_root *root, int fd, struct btrfs_key *key,
 551                      const char *file)
 552 {
 553         struct extent_buffer *leaf;
 554         struct btrfs_path *path;
 555         struct btrfs_file_extent_item *fi;
 556         struct btrfs_inode_item *inode_item;
 557         struct btrfs_key found_key;
 558         int ret;
 559         int extent_type;
 560         int compression;
 561         int loops = 0;
 562         u64 found_size = 0;
 563
 564         path = btrfs_alloc_path();
 565         if (!path) {
 566                 fprintf(stderr, "Ran out of memory\n");
 567                 return -ENOMEM;
 568         }
 569
 570         ret = btrfs_lookup_inode(NULL, root, path, key, 0);
 571         if (ret == 0) {
 572                 inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
 573                                     struct btrfs_inode_item);
 574                 found_size = btrfs_inode_size(path->nodes[0], inode_item);
 575         }
 576         btrfs_release_path(path);
 577
 578         key->offset = 0;
 579         key->type = BTRFS_EXTENT_DATA_KEY;
 580
 581         ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
 582         if (ret < 0) {
 583                 fprintf(stderr, "Error searching %d\n", ret);
 584                 btrfs_free_path(path);
 585                 return ret;
 586         }
 587
 588         leaf = path->nodes[0];
 589         while (!leaf) {
 590                 ret = next_leaf(root, path);
 591                 if (ret < 0) {
 592                         fprintf(stderr, "Error getting next leaf %d\n",
 593                                 ret);
 594                         btrfs_free_path(path);
 595                         return ret;
 596                 } else if (ret > 0) {
 597                         /* No more leaves to search */
 598                         btrfs_free_path(path);
 599                         return 0;
 600                 }
 601                 leaf = path->nodes[0];
 602         }
 603
 604         while (1) {
 605                 if (loops >= 0 && loops++ >= 1024) {
 606                         enum loop_response resp;
 607
 608                         resp = ask_to_continue(file);
 609                         if (resp == LOOP_STOP)
 610                                 break;
 611                         else if (resp == LOOP_CONTINUE)
 612                                 loops = 0;
 613                         else if (resp == LOOP_DONTASK)
 614                                 loops = -1;
 615                 }
 616                 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
 617                         do {
 618                                 ret = next_leaf(root, path);
 619                                 if (ret < 0) {
 620                                         fprintf(stderr, "Error searching %d\n", ret);
 621                                         btrfs_free_path(path);
 622                                         return ret;
 623                                 } else if (ret) {
 624                                         /* No more leaves to search */
 625                                         btrfs_free_path(path);
 626                                         goto set_size;
 627                                 }
 628                                 leaf = path->nodes[0];
 629                         } while (!leaf);
 630                         continue;
 631                 }
 632                 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
 633                 if (found_key.objectid != key->objectid)
 634                         break;
 635                 if (found_key.type != key->type)
 636                         break;
 637                 fi = btrfs_item_ptr(leaf, path->slots[0],
 638                                     struct btrfs_file_extent_item);
 639                 extent_type = btrfs_file_extent_type(leaf, fi);
 640                 compression = btrfs_file_extent_compression(leaf, fi);
 641                 if (compression >= BTRFS_COMPRESS_LAST) {
 642                         fprintf(stderr, "Don't support compression yet %d\n",
 643                                 compression);
 644                         btrfs_free_path(path);
 645                         return -1;
 646                 }
 647
 648                 if (extent_type == BTRFS_FILE_EXTENT_PREALLOC)
 649                         goto next;
 650                 if (extent_type == BTRFS_FILE_EXTENT_INLINE) {
 651                         ret = copy_one_inline(fd, path, found_key.offset);
 652                         if (ret) {
 653                                 btrfs_free_path(path);
 654                                 return -1;
 655                         }
 656                 } else if (extent_type == BTRFS_FILE_EXTENT_REG) {
 657                         ret = copy_one_extent(root, fd, leaf, fi,
 658                                               found_key.offset);
 659                         if (ret) {
 660                                 btrfs_free_path(path);
 661                                 return ret;
 662                         }
 663                 } else {
 664                         printf("Weird extent type %d\n", extent_type);
 665                 }
 666 next:
 667                 path->slots[0]++;
 668         }
 669
 670         btrfs_free_path(path);
 671 set_size:
 672         if (found_size) {
 673                 ret = ftruncate(fd, (loff_t)found_size);
 674                 if (ret)
 675                         return ret;
 676         }
 677         if (get_xattrs) {
 678                 ret = set_file_xattrs(root, key->objectid, fd, file);
 679                 if (ret)
 680                         return ret;
 681         }
 682         return 0;
 683 }
 684
 685 static int search_dir(struct btrfs_root *root, struct btrfs_key *key,
 686                       const char *output_rootdir, const char *in_dir,
 687                       const regex_t *mreg)
 688 {
 689         struct btrfs_path *path;
 690         struct extent_buffer *leaf;
 691         struct btrfs_dir_item *dir_item;
 692         struct btrfs_key found_key, location;
 693         char filename[BTRFS_NAME_LEN + 1];
 694         unsigned long name_ptr;
 695         int name_len;
 696         int ret;
 697         int fd;
 698         int loops = 0;
 699         u8 type;
 700
 701         path = btrfs_alloc_path();
 702         if (!path) {
 703                 fprintf(stderr, "Ran out of memory\n");
 704                 return -ENOMEM;
 705         }
 706
 707         key->offset = 0;
 708         key->type = BTRFS_DIR_INDEX_KEY;
 709
 710         ret = btrfs_search_slot(NULL, root, key, path, 0, 0);
 711         if (ret < 0) {
 712                 fprintf(stderr, "Error searching %d\n", ret);
 713                 btrfs_free_path(path);
 714                 return ret;
 715         }
 716
 717         leaf = path->nodes[0];
 718         while (!leaf) {
 719                 if (verbose > 1)
 720                         printf("No leaf after search, looking for the next "
 721                                "leaf\n");
 722                 ret = next_leaf(root, path);
 723                 if (ret < 0) {
 724                         fprintf(stderr, "Error getting next leaf %d\n",
 725                                 ret);
 726                         btrfs_free_path(path);
 727                         return ret;
 728                 } else if (ret > 0) {
 729                         /* No more leaves to search */
 730                         if (verbose)
 731                                 printf("Reached the end of the tree looking "
 732                                        "for the directory\n");
 733                         btrfs_free_path(path);
 734                         return 0;
 735                 }
 736                 leaf = path->nodes[0];
 737         }
 738
 739         while (leaf) {
 740                 if (loops++ >= 1024) {
 741                         printf("We have looped trying to restore files in %s "
 742                                "too many times to be making progress, "
 743                                "stopping\n", in_dir);
 744                         break;
 745                 }
 746
 747                 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
 748                         do {
 749                                 ret = next_leaf(root, path);
 750                                 if (ret < 0) {
 751                                         fprintf(stderr, "Error searching %d\n",
 752                                                 ret);
 753                                         btrfs_free_path(path);
 754                                         return ret;
 755                                 } else if (ret > 0) {
 756                                         /* No more leaves to search */
 757                                         if (verbose)
 758                                                 printf("Reached the end of "
 759                                                        "the tree searching the"
 760                                                        " directory\n");
 761                                         btrfs_free_path(path);
 762                                         return 0;
 763                                 }
 764                                 leaf = path->nodes[0];
 765                         } while (!leaf);
 766                         continue;
 767                 }
 768                 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
 769                 if (found_key.objectid != key->objectid) {
 770                         if (verbose > 1)
 771                                 printf("Found objectid=%Lu, key=%Lu\n",
 772                                        found_key.objectid, key->objectid);
 773                         break;
 774                 }
 775                 if (found_key.type != key->type) {
 776                         if (verbose > 1)
 777                                 printf("Found type=%u, want=%u\n",
 778                                        found_key.type, key->type);
 779                         break;
 780                 }
 781                 dir_item = btrfs_item_ptr(leaf, path->slots[0],
 782                                           struct btrfs_dir_item);
 783                 name_ptr = (unsigned long)(dir_item + 1);
 784                 name_len = btrfs_dir_name_len(leaf, dir_item);
 785                 read_extent_buffer(leaf, filename, name_ptr, name_len);
 786                 filename[name_len] = '\0';
 787                 type = btrfs_dir_type(leaf, dir_item);
 788                 btrfs_dir_item_key_to_cpu(leaf, dir_item, &location);
 789
 790                 /* full path from root of btrfs being restored */
 791                 snprintf(fs_name, 4096, "%s/%s", in_dir, filename);
 792
 793                 if (mreg && REG_NOMATCH == regexec(mreg, fs_name, 0, NULL, 0))
 794                         goto next;
 795
 796                 /* full path from system root */
 797                 snprintf(path_name, 4096, "%s%s", output_rootdir, fs_name);
 798
 799                 /*
 800                  * At this point we're only going to restore directories and
 801                  * files, no symlinks or anything else.
 802                  */
 803                 if (type == BTRFS_FT_REG_FILE) {
 804                         if (!overwrite) {
 805                                 static int warn = 0;
 806                                 struct stat st;
 807
 808                                 ret = stat(path_name, &st);
 809                                 if (!ret) {
 810                                         loops = 0;
 811                                         if (verbose || !warn)
 812                                                 printf("Skipping existing file"
 813                                                        " %s\n", path_name);
 814                                         if (warn)
 815                                                 goto next;
 816                                         printf("If you wish to overwrite use "
 817                                                "the -o option to overwrite\n");
 818                                         warn = 1;
 819                                         goto next;
 820                                 }
 821                                 ret = 0;
 822                         }
 823                         if (verbose)
 824                                 printf("Restoring %s\n", path_name);
 825                         if (dry_run)
 826                                 goto next;
 827                         fd = open(path_name, O_CREAT|O_WRONLY, 0644);
 828                         if (fd < 0) {
 829                                 fprintf(stderr, "Error creating %s: %d\n",
 830                                         path_name, errno);
 831                                 if (ignore_errors)
 832                                         goto next;
 833                                 btrfs_free_path(path);
 834                                 return -1;
 835                         }
 836                         loops = 0;
 837                         ret = copy_file(root, fd, &location, path_name);
 838                         close(fd);
 839                         if (ret) {
 840                                 if (ignore_errors)
 841                                         goto next;
 842                                 btrfs_free_path(path);
 843                                 return ret;
 844                         }
 845                 } else if (type == BTRFS_FT_DIR) {
 846                         struct btrfs_root *search_root = root;
 847                         char *dir = strdup(fs_name);
 848
 849                         if (!dir) {
 850                                 fprintf(stderr, "Ran out of memory\n");
 851                                 btrfs_free_path(path);
 852                                 return -ENOMEM;
 853                         }
 854
 855                         if (location.type == BTRFS_ROOT_ITEM_KEY) {
 856                                 /*
 857                                  * If we are a snapshot and this is the index
 858                                  * object to ourselves just skip it.
 859                                  */
 860                                 if (location.objectid ==
 861                                     root->root_key.objectid) {
 862                                         free(dir);
 863                                         goto next;
 864                                 }
 865
 866                                 location.offset = (u64)-1;
 867                                 search_root = btrfs_read_fs_root(root->fs_info,
 868                                                                  &location);
 869                                 if (IS_ERR(search_root)) {
 870                                         free(dir);
 871                                         fprintf(stderr, "Error reading "
 872                                                 "subvolume %s: %lu\n",
 873                                                 path_name,
 874                                                 PTR_ERR(search_root));
 875                                         if (ignore_errors)
 876                                                 goto next;
 877                                         btrfs_free_path(path);
 878                                         return PTR_ERR(search_root);
 879                                 }
 880
 881                                 /*
 882                                  * A subvolume will have a key.offset of 0, a
 883                                  * snapshot will have key.offset of a transid.
 884                                  */
 885                                 if (search_root->root_key.offset != 0 &&
 886                                     get_snaps == 0) {
 887                                         free(dir);
 888                                         printf("Skipping snapshot %s\n",
 889                                                filename);
 890                                         goto next;
 891                                 }
 892                                 location.objectid = BTRFS_FIRST_FREE_OBJECTID;
 893                         }
 894
 895                         if (verbose)
 896                                 printf("Restoring %s\n", path_name);
 897
 898                         errno = 0;
 899                         if (dry_run)
 900                                 ret = 0;
 901                         else
 902                                 ret = mkdir(path_name, 0755);
 903                         if (ret && errno != EEXIST) {
 904                                 free(dir);
 905                                 fprintf(stderr, "Error mkdiring %s: %d\n",
 906                                         path_name, errno);
 907                                 if (ignore_errors)
 908                                         goto next;
 909                                 btrfs_free_path(path);
 910                                 return -1;
 911                         }
 912                         loops = 0;
 913                         ret = search_dir(search_root, &location,
 914                                          output_rootdir, dir, mreg);
 915                         free(dir);
 916                         if (ret) {
 917                                 if (ignore_errors)
 918                                         goto next;
 919                                 btrfs_free_path(path);
 920                                 return ret;
 921                         }
 922                 }
 923 next:
 924                 path->slots[0]++;
 925         }
 926
 927         if (verbose)
 928                 printf("Done searching %s\n", in_dir);
 929         btrfs_free_path(path);
 930         return 0;
 931 }
 932
 933 static int do_list_roots(struct btrfs_root *root)
 934 {
 935         struct btrfs_key key;
 936         struct btrfs_key found_key;
 937         struct btrfs_disk_key disk_key;
 938         struct btrfs_path *path;
 939         struct extent_buffer *leaf;
 940         struct btrfs_root_item ri;
 941         unsigned long offset;
 942         int slot;
 943         int ret;
 944
 945         root = root->fs_info->tree_root;
 946         path = btrfs_alloc_path();
 947         if (!path) {
 948                 fprintf(stderr, "Failed to alloc path\n");
 949                 return -ENOMEM;
 950         }
 951
 952         key.offset = 0;
 953         key.objectid = 0;
 954         key.type = BTRFS_ROOT_ITEM_KEY;
 955
 956         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
 957         if (ret < 0) {
 958                 fprintf(stderr, "Failed to do search %d\n", ret);
 959                 btrfs_free_path(path);
 960                 return -1;
 961         }
 962
 963         while (1) {
 964                 leaf = path->nodes[0];
 965                 slot = path->slots[0];
 966                 if (slot >= btrfs_header_nritems(leaf)) {
 967                         ret = btrfs_next_leaf(root, path);
 968                         if (ret)
 969                                 break;
 970                         leaf = path->nodes[0];
 971                         slot = path->slots[0];
 972                 }
 973                 btrfs_item_key(leaf, &disk_key, slot);
 974                 btrfs_disk_key_to_cpu(&found_key, &disk_key);
 975                 if (btrfs_key_type(&found_key) != BTRFS_ROOT_ITEM_KEY) {
 976                         path->slots[0]++;
 977                         continue;
 978                 }
 979
 980                 offset = btrfs_item_ptr_offset(leaf, slot);
 981                 read_extent_buffer(leaf, &ri, offset, sizeof(ri));
 982                 printf(" tree ");
 983                 btrfs_print_key(&disk_key);
 984                 printf(" %Lu level %d\n", btrfs_root_bytenr(&ri),
 985                        btrfs_root_level(&ri));
 986                 path->slots[0]++;
 987         }
 988         btrfs_free_path(path);
 989
 990         return 0;
 991 }
 992
 993 static struct btrfs_root *open_fs(const char *dev, u64 root_location,
 994                                   int super_mirror, int list_roots)
 995 {
 996         struct btrfs_fs_info *fs_info = NULL;
 997         struct btrfs_root *root = NULL;
 998         u64 bytenr;
 999         int i;
1000
1001         for (i = super_mirror; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1002                 bytenr = btrfs_sb_offset(i);
1003                 fs_info = open_ctree_fs_info(dev, bytenr, root_location,
1004                                              OPEN_CTREE_PARTIAL);
1005                 if (fs_info)
1006                         break;
1007                 fprintf(stderr, "Could not open root, trying backup super\n");
1008         }
1009
1010         if (!fs_info)
1011                 return NULL;
1012
1013         /*
1014          * All we really need to succeed is reading the chunk tree, everything
1015          * else we can do by hand, since we only need to read the tree root and
1016          * the fs_root.
1017          */
1018         if (!extent_buffer_uptodate(fs_info->tree_root->node)) {
1019                 u64 generation;
1020
1021                 root = fs_info->tree_root;
1022                 if (!root_location)
1023                         root_location = btrfs_super_root(fs_info->super_copy);
1024                 generation = btrfs_super_generation(fs_info->super_copy);
1025                 root->node = read_tree_block(root, root_location,
1026                                              root->leafsize, generation);
1027                 if (!extent_buffer_uptodate(root->node)) {
1028                         fprintf(stderr, "Error opening tree root\n");
1029                         close_ctree(root);
1030                         return NULL;
1031                 }
1032         }
1033
1034         if (!list_roots && !fs_info->fs_root) {
1035                 struct btrfs_key key;
1036
1037                 key.objectid = BTRFS_FS_TREE_OBJECTID;
1038                 key.type = BTRFS_ROOT_ITEM_KEY;
1039                 key.offset = (u64)-1;
1040                 fs_info->fs_root = btrfs_read_fs_root_no_cache(fs_info, &key);
1041                 if (IS_ERR(fs_info->fs_root)) {
1042                         fprintf(stderr, "Couldn't read fs root: %ld\n",
1043                                 PTR_ERR(fs_info->fs_root));
1044                         close_ctree(fs_info->tree_root);
1045                         return NULL;
1046                 }
1047         }
1048
1049         if (list_roots && do_list_roots(fs_info->tree_root)) {
1050                 close_ctree(fs_info->tree_root);
1051                 return NULL;
1052         }
1053
1054         return fs_info->fs_root;
1055 }
1056
1057 static int find_first_dir(struct btrfs_root *root, u64 *objectid)
1058 {
1059         struct btrfs_path *path;
1060         struct btrfs_key found_key;
1061         struct btrfs_key key;
1062         int ret = -1;
1063         int i;
1064
1065         key.objectid = 0;
1066         key.type = BTRFS_DIR_INDEX_KEY;
1067         key.offset = 0;
1068
1069         path = btrfs_alloc_path();
1070         if (!path) {
1071                 fprintf(stderr, "Ran out of memory\n");
1072                 return ret;
1073         }
1074
1075         ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1076         if (ret < 0) {
1077                 fprintf(stderr, "Error searching %d\n", ret);
1078                 goto out;
1079         }
1080
1081         if (!path->nodes[0]) {
1082                 fprintf(stderr, "No leaf!\n");
1083                 goto out;
1084         }
1085 again:
1086         for (i = path->slots[0];
1087              i < btrfs_header_nritems(path->nodes[0]); i++) {
1088                 btrfs_item_key_to_cpu(path->nodes[0], &found_key, i);
1089                 if (found_key.type != key.type)
1090                         continue;
1091
1092                 printf("Using objectid %Lu for first dir\n",
1093                        found_key.objectid);
1094                 *objectid = found_key.objectid;
1095                 ret = 0;
1096                 goto out;
1097         }
1098         do {
1099                 ret = next_leaf(root, path);
1100                 if (ret < 0) {
1101                         fprintf(stderr, "Error getting next leaf %d\n",
1102                                 ret);
1103                         goto out;
1104                 } else if (ret > 0) {
1105                         fprintf(stderr, "No more leaves\n");
1106                         goto out;
1107                 }
1108         } while (!path->nodes[0]);
1109         if (path->nodes[0])
1110                 goto again;
1111         printf("Couldn't find a dir index item\n");
1112 out:
1113         btrfs_free_path(path);
1114         return ret;
1115 }
1116
1117 static struct option long_options[] = {
1118         { "path-regex", 1, NULL, 256},
1119         { "dry-run", 0, NULL, 'D'},
1120         { NULL, 0, NULL, 0}
1121 };
1122
1123 const char * const cmd_restore_usage[] = {
1124         "btrfs restore [options] <device> <path> | -l <device>",
1125         "Try to restore files from a damaged filesystem (unmounted)",
1126         "",
1127         "-s              get snapshots",
1128         "-x              get extended attributes",
1129         "-v              verbose",
1130         "-i              ignore errors",
1131         "-o              overwrite",
1132         "-t <bytenr>     tree location",
1133         "-f <bytenr>     filesystem location",
1134         "-u <mirror>     super mirror",
1135         "-r <rootid>     root objectid",
1136         "-d              find dir",
1137         "-l              list tree roots",
1138         "-D|--dry-run    dry run (only list files that would be recovered)",
1139         "--path-regex <regex>",
1140         "                restore only filenames matching regex,",
1141         "                you have to use following syntax (possibly quoted):",
1142         "                ^/(|home(|/username(|/Desktop(|/.*))))$",
1143         "-c              ignore case (--path-regrex only)",
1144         NULL
1145 };
1146
1147 int cmd_restore(int argc, char **argv)
1148 {
1149         struct btrfs_root *root;
1150         struct btrfs_key key;
1151         char dir_name[128];
1152         u64 tree_location = 0;
1153         u64 fs_location = 0;
1154         u64 root_objectid = 0;
1155         int len;
1156         int ret;
1157         int opt;
1158         int option_index = 0;
1159         int super_mirror = 0;
1160         int find_dir = 0;
1161         int list_roots = 0;
1162         const char *match_regstr = NULL;
1163         int match_cflags = REG_EXTENDED | REG_NOSUB | REG_NEWLINE;
1164         regex_t match_reg, *mreg = NULL;
1165         char reg_err[256];
1166
1167         while ((opt = getopt_long(argc, argv, "sxviot:u:df:r:lDc", long_options,
1168                                         &option_index)) != -1) {
1169
1170                 switch (opt) {
1171                         case 's':
1172                                 get_snaps = 1;
1173                                 break;
1174                         case 'v':
1175                                 verbose++;
1176                                 break;
1177                         case 'i':
1178                                 ignore_errors = 1;
1179                                 break;
1180                         case 'o':
1181                                 overwrite = 1;
1182                                 break;
1183                         case 't':
1184                                 tree_location = arg_strtou64(optarg);
1185                                 break;
1186                         case 'f':
1187                                 fs_location = arg_strtou64(optarg);
1188                                 break;
1189                         case 'u':
1190                                 super_mirror = arg_strtou64(optarg);
1191                                 if (super_mirror >= BTRFS_SUPER_MIRROR_MAX) {
1192                                         fprintf(stderr, "Super mirror not "
1193                                                 "valid\n");
1194                                         exit(1);
1195                                 }
1196                                 break;
1197                         case 'd':
1198                                 find_dir = 1;
1199                                 break;
1200                         case 'r':
1201                                 root_objectid = arg_strtou64(optarg);
1202                                 if (!is_fstree(root_objectid)) {
1203                                         fprintf(stderr, "objectid %llu is not a valid fs/file tree\n",
1204                                                         root_objectid);
1205                                         exit(1);
1206                                 }
1207                                 break;
1208                         case 'l':
1209                                 list_roots = 1;
1210                                 break;
1211                         case 'D':
1212                                 dry_run = 1;
1213                                 break;
1214                         case 'c':
1215                                 match_cflags |= REG_ICASE;
1216                                 break;
1217                         /* long option without single letter alternative */
1218                         case 256:
1219                                 match_regstr = optarg;
1220                                 break;
1221                         case 'x':
1222                                 get_xattrs = 1;
1223                                 break;
1224                         default:
1225                                 usage(cmd_restore_usage);
1226                 }
1227         }
1228
1229         set_argv0(argv);
1230         if (!list_roots && check_argc_min(argc - optind, 2))
1231                 usage(cmd_restore_usage);
1232         else if (list_roots && check_argc_min(argc - optind, 1))
1233                 usage(cmd_restore_usage);
1234
1235         if (fs_location && root_objectid) {
1236                 fprintf(stderr, "don't use -f and -r at the same time.\n");
1237                 return 1;
1238         }
1239
1240         if ((ret = check_mounted(argv[optind])) < 0) {
1241                 fprintf(stderr, "Could not check mount status: %s\n",
1242                         strerror(-ret));
1243                 return 1;
1244         } else if (ret) {
1245                 fprintf(stderr, "%s is currently mounted.  Aborting.\n", argv[optind]);
1246                 return 1;
1247         }
1248
1249         root = open_fs(argv[optind], tree_location, super_mirror, list_roots);
1250         if (root == NULL)
1251                 return 1;
1252
1253         if (list_roots)
1254                 goto out;
1255
1256         if (fs_location != 0) {
1257                 free_extent_buffer(root->node);
1258                 root->node = read_tree_block(root, fs_location, root->leafsize, 0);
1259                 if (!root->node) {
1260                         fprintf(stderr, "Failed to read fs location\n");
1261                         ret = 1;
1262                         goto out;
1263                 }
1264         }
1265
1266         memset(path_name, 0, 4096);
1267
1268         strncpy(dir_name, argv[optind + 1], sizeof dir_name);
1269         dir_name[sizeof dir_name - 1] = 0;
1270
1271         /* Strip the trailing / on the dir name */
1272         len = strlen(dir_name);
1273         while (len && dir_name[--len] == '/') {
1274                 dir_name[len] = '\0';
1275         }
1276
1277         if (root_objectid != 0) {
1278                 struct btrfs_root *orig_root = root;
1279
1280                 key.objectid = root_objectid;
1281                 key.type = BTRFS_ROOT_ITEM_KEY;
1282                 key.offset = (u64)-1;
1283                 root = btrfs_read_fs_root(orig_root->fs_info, &key);
1284                 if (IS_ERR(root)) {
1285                         fprintf(stderr, "fail to read root %llu: %s\n",
1286                                         root_objectid, strerror(-PTR_ERR(root)));
1287                         root = orig_root;
1288                         ret = 1;
1289                         goto out;
1290                 }
1291                 key.type = 0;
1292                 key.offset = 0;
1293         }
1294
1295         if (find_dir) {
1296                 ret = find_first_dir(root, &key.objectid);
1297                 if (ret)
1298                         goto out;
1299         } else {
1300                 key.objectid = BTRFS_FIRST_FREE_OBJECTID;
1301         }
1302
1303         if (match_regstr) {
1304                 ret = regcomp(&match_reg, match_regstr, match_cflags);
1305                 if (ret) {
1306                         regerror(ret, &match_reg, reg_err, sizeof(reg_err));
1307                         fprintf(stderr, "Regex compile failed: %s\n", reg_err);
1308                         goto out;
1309                 }
1310                 mreg = &match_reg;
1311         }
1312
1313         if (dry_run)
1314                 printf("This is a dry-run, no files are going to be restored\n");
1315
1316         ret = search_dir(root, &key, dir_name, "", mreg);
1317
1318 out:
1319         if (mreg)
1320                 regfree(mreg);
1321         close_ctree(root);
1322         return !!ret;
1323 }