btrfs-list.c

   1 /*
   2  * Copyright (C) 2010 Oracle.  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 _GNU_SOURCE
  20 #ifndef __CHECKER__
  21 #include <sys/ioctl.h>
  22 #include <sys/mount.h>
  23 #include "ioctl.h"
  24 #endif
  25 #include <stdio.h>
  26 #include <stdlib.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <unistd.h>
  31 #include <dirent.h>
  32 #include <libgen.h>
  33 #include "ctree.h"
  34 #include "transaction.h"
  35 #include "utils.h"
  36 #include <uuid/uuid.h>
  37 #include "btrfs-list.h"
  38
  39 #define BTRFS_LIST_NFILTERS_INCREASE    (2 * BTRFS_LIST_FILTER_MAX)
  40 #define BTRFS_LIST_NCOMPS_INCREASE      (2 * BTRFS_LIST_COMP_MAX)
  41
  42 /* we store all the roots we find in an rbtree so that we can
  43  * search for them later.
  44  */
  45 struct root_lookup {
  46         struct rb_root root;
  47 };
  48
  49 struct {
  50         char    *name;
  51         char    *column_name;
  52         int     need_print;
  53 } btrfs_list_columns[] = {
  54         {
  55                 .name           = "ID",
  56                 .column_name    = "ID",
  57                 .need_print     = 0,
  58         },
  59         {
  60                 .name           = "gen",
  61                 .column_name    = "Gen",
  62                 .need_print     = 0,
  63         },
  64         {
  65                 .name           = "cgen",
  66                 .column_name    = "CGen",
  67                 .need_print     = 0,
  68         },
  69         {
  70                 .name           = "parent",
  71                 .column_name    = "Parent",
  72                 .need_print     = 0,
  73         },
  74         {
  75                 .name           = "top level",
  76                 .column_name    = "Top Level",
  77                 .need_print     = 0,
  78         },
  79         {
  80                 .name           = "otime",
  81                 .column_name    = "OTime",
  82                 .need_print     = 0,
  83         },
  84         {
  85                 .name           = "parent_uuid",
  86                 .column_name    = "Parent UUID",
  87                 .need_print     = 0,
  88         },
  89         {
  90                 .name           = "uuid",
  91                 .column_name    = "UUID",
  92                 .need_print     = 0,
  93         },
  94         {
  95                 .name           = "path",
  96                 .column_name    = "Path",
  97                 .need_print     = 0,
  98         },
  99         {
 100                 .name           = NULL,
 101                 .column_name    = NULL,
 102                 .need_print     = 0,
 103         },
 104 };
 105
 106 static btrfs_list_filter_func all_filter_funcs[];
 107 static btrfs_list_comp_func all_comp_funcs[];
 108
 109 void btrfs_list_setup_print_column(enum btrfs_list_column_enum column)
 110 {
 111         int i;
 112
 113         BUG_ON(column < 0 || column > BTRFS_LIST_ALL);
 114
 115         if (column < BTRFS_LIST_ALL) {
 116                 btrfs_list_columns[column].need_print = 1;
 117                 return;
 118         }
 119
 120         for (i = 0; i < BTRFS_LIST_ALL; i++)
 121                 btrfs_list_columns[i].need_print = 1;
 122 }
 123
 124 static void root_lookup_init(struct root_lookup *tree)
 125 {
 126         tree->root.rb_node = NULL;
 127 }
 128
 129 static int comp_entry_with_rootid(struct root_info *entry1,
 130                                   struct root_info *entry2,
 131                                   int is_descending)
 132 {
 133         int ret;
 134
 135         if (entry1->root_id > entry2->root_id)
 136                 ret = 1;
 137         else if (entry1->root_id < entry2->root_id)
 138                 ret = -1;
 139         else
 140                 ret = 0;
 141
 142         return is_descending ? -ret : ret;
 143 }
 144
 145 static int comp_entry_with_gen(struct root_info *entry1,
 146                                struct root_info *entry2,
 147                                int is_descending)
 148 {
 149         int ret;
 150
 151         if (entry1->gen > entry2->gen)
 152                 ret = 1;
 153         else if (entry1->gen < entry2->gen)
 154                 ret = -1;
 155         else
 156                 ret = 0;
 157
 158         return is_descending ? -ret : ret;
 159 }
 160
 161 static int comp_entry_with_ogen(struct root_info *entry1,
 162                                 struct root_info *entry2,
 163                                 int is_descending)
 164 {
 165         int ret;
 166
 167         if (entry1->ogen > entry2->ogen)
 168                 ret = 1;
 169         else if (entry1->ogen < entry2->ogen)
 170                 ret = -1;
 171         else
 172                 ret = 0;
 173
 174         return is_descending ? -ret : ret;
 175 }
 176
 177 static int comp_entry_with_path(struct root_info *entry1,
 178                                 struct root_info *entry2,
 179                                 int is_descending)
 180 {
 181         int ret;
 182
 183         if (strcmp(entry1->full_path, entry2->full_path) > 0)
 184                 ret = 1;
 185         else if (strcmp(entry1->full_path, entry2->full_path) < 0)
 186                 ret = -1;
 187         else
 188                 ret = 0;
 189
 190         return is_descending ? -ret : ret;
 191 }
 192
 193 static btrfs_list_comp_func all_comp_funcs[] = {
 194         [BTRFS_LIST_COMP_ROOTID]        = comp_entry_with_rootid,
 195         [BTRFS_LIST_COMP_OGEN]          = comp_entry_with_ogen,
 196         [BTRFS_LIST_COMP_GEN]           = comp_entry_with_gen,
 197         [BTRFS_LIST_COMP_PATH]          = comp_entry_with_path,
 198 };
 199
 200 static char *all_sort_items[] = {
 201         [BTRFS_LIST_COMP_ROOTID]        = "rootid",
 202         [BTRFS_LIST_COMP_OGEN]          = "ogen",
 203         [BTRFS_LIST_COMP_GEN]           = "gen",
 204         [BTRFS_LIST_COMP_PATH]          = "path",
 205         [BTRFS_LIST_COMP_MAX]           = NULL,
 206 };
 207
 208 static int  btrfs_list_get_sort_item(char *sort_name)
 209 {
 210         int i;
 211
 212         for (i = 0; i < BTRFS_LIST_COMP_MAX; i++) {
 213                 if (strcmp(sort_name, all_sort_items[i]) == 0)
 214                         return i;
 215         }
 216         return -1;
 217 }
 218
 219 struct btrfs_list_comparer_set *btrfs_list_alloc_comparer_set(void)
 220 {
 221         struct btrfs_list_comparer_set *set;
 222         int size;
 223
 224         size = sizeof(struct btrfs_list_comparer_set) +
 225                BTRFS_LIST_NCOMPS_INCREASE * sizeof(struct btrfs_list_comparer);
 226         set = malloc(size);
 227         if (!set) {
 228                 fprintf(stderr, "memory allocation failed\n");
 229                 exit(1);
 230         }
 231
 232         memset(set, 0, size);
 233         set->total = BTRFS_LIST_NCOMPS_INCREASE;
 234
 235         return set;
 236 }
 237
 238 void btrfs_list_free_comparer_set(struct btrfs_list_comparer_set *comp_set)
 239 {
 240         free(comp_set);
 241 }
 242
 243 int btrfs_list_setup_comparer(struct btrfs_list_comparer_set  **comp_set,
 244                               enum btrfs_list_comp_enum comparer,
 245                               int is_descending)
 246 {
 247         struct btrfs_list_comparer_set *set = *comp_set;
 248         int size;
 249
 250         BUG_ON(!set);
 251         BUG_ON(comparer >= BTRFS_LIST_COMP_MAX);
 252         BUG_ON(set->ncomps > set->total);
 253
 254         if (set->ncomps == set->total) {
 255                 size = set->total + BTRFS_LIST_NCOMPS_INCREASE;
 256                 size = sizeof(*set) + size * sizeof(struct btrfs_list_comparer);
 257                 set = realloc(set, size);
 258                 if (!set) {
 259                         fprintf(stderr, "memory allocation failed\n");
 260                         exit(1);
 261                 }
 262
 263                 memset(&set->comps[set->total], 0,
 264                        BTRFS_LIST_NCOMPS_INCREASE *
 265                        sizeof(struct btrfs_list_comparer));
 266                 set->total += BTRFS_LIST_NCOMPS_INCREASE;
 267                 *comp_set = set;
 268         }
 269
 270         BUG_ON(set->comps[set->ncomps].comp_func);
 271
 272         set->comps[set->ncomps].comp_func = all_comp_funcs[comparer];
 273         set->comps[set->ncomps].is_descending = is_descending;
 274         set->ncomps++;
 275         return 0;
 276 }
 277
 278 static int sort_comp(struct root_info *entry1, struct root_info *entry2,
 279                      struct btrfs_list_comparer_set *set)
 280 {
 281         int rootid_compared = 0;
 282         int i, ret = 0;
 283
 284         if (!set || !set->ncomps)
 285                 goto comp_rootid;
 286
 287         for (i = 0; i < set->ncomps; i++) {
 288                 if (!set->comps[i].comp_func)
 289                         break;
 290
 291                 ret = set->comps[i].comp_func(entry1, entry2,
 292                                               set->comps[i].is_descending);
 293                 if (ret)
 294                         return ret;
 295
 296                 if (set->comps[i].comp_func == comp_entry_with_rootid)
 297                         rootid_compared = 1;
 298         }
 299
 300         if (!rootid_compared) {
 301 comp_rootid:
 302                 ret = comp_entry_with_rootid(entry1, entry2, 0);
 303         }
 304
 305         return ret;
 306 }
 307
 308 static int sort_tree_insert(struct root_lookup *sort_tree,
 309                             struct root_info *ins,
 310                             struct btrfs_list_comparer_set *comp_set)
 311 {
 312         struct rb_node **p = &sort_tree->root.rb_node;
 313         struct rb_node *parent = NULL;
 314         struct root_info *curr;
 315         int ret;
 316
 317         while (*p) {
 318                 parent = *p;
 319                 curr = rb_entry(parent, struct root_info, sort_node);
 320
 321                 ret = sort_comp(ins, curr, comp_set);
 322                 if (ret < 0)
 323                         p = &(*p)->rb_left;
 324                 else if (ret > 0)
 325                         p = &(*p)->rb_right;
 326                 else
 327                         return -EEXIST;
 328         }
 329
 330         rb_link_node(&ins->sort_node, parent, p);
 331         rb_insert_color(&ins->sort_node, &sort_tree->root);
 332         return 0;
 333 }
 334
 335 /*
 336  * insert a new root into the tree.  returns the existing root entry
 337  * if one is already there.  Both root_id and ref_tree are used
 338  * as the key
 339  */
 340 static int root_tree_insert(struct root_lookup *root_tree,
 341                             struct root_info *ins)
 342 {
 343         struct rb_node **p = &root_tree->root.rb_node;
 344         struct rb_node * parent = NULL;
 345         struct root_info *curr;
 346         int ret;
 347
 348         while(*p) {
 349                 parent = *p;
 350                 curr = rb_entry(parent, struct root_info, rb_node);
 351
 352                 ret = comp_entry_with_rootid(ins, curr, 0);
 353                 if (ret < 0)
 354                         p = &(*p)->rb_left;
 355                 else if (ret > 0)
 356                         p = &(*p)->rb_right;
 357                 else
 358                         return -EEXIST;
 359         }
 360
 361         rb_link_node(&ins->rb_node, parent, p);
 362         rb_insert_color(&ins->rb_node, &root_tree->root);
 363         return 0;
 364 }
 365
 366 /*
 367  * find a given root id in the tree.  We return the smallest one,
 368  * rb_next can be used to move forward looking for more if required
 369  */
 370 static struct root_info *root_tree_search(struct root_lookup *root_tree,
 371                                           u64 root_id)
 372 {
 373         struct rb_node *n = root_tree->root.rb_node;
 374         struct root_info *entry;
 375         struct root_info tmp;
 376         int ret;
 377
 378         tmp.root_id = root_id;
 379
 380         while(n) {
 381                 entry = rb_entry(n, struct root_info, rb_node);
 382
 383                 ret = comp_entry_with_rootid(&tmp, entry, 0);
 384                 if (ret < 0)
 385                         n = n->rb_left;
 386                 else if (ret > 0)
 387                         n = n->rb_right;
 388                 else
 389                         return entry;
 390         }
 391         return NULL;
 392 }
 393
 394 static int update_root(struct root_lookup *root_lookup,
 395                        u64 root_id, u64 ref_tree, u64 root_offset, u64 flags,
 396                        u64 dir_id, char *name, int name_len, u64 ogen, u64 gen,
 397                        time_t ot, void *uuid, void *puuid)
 398 {
 399         struct root_info *ri;
 400
 401         ri = root_tree_search(root_lookup, root_id);
 402         if (!ri || ri->root_id != root_id)
 403                 return -ENOENT;
 404         if (name && name_len > 0) {
 405                 if (ri->name)
 406                         free(ri->name);
 407
 408                 ri->name = malloc(name_len + 1);
 409                 if (!ri->name) {
 410                         fprintf(stderr, "memory allocation failed\n");
 411                         exit(1);
 412                 }
 413                 strncpy(ri->name, name, name_len);
 414                 ri->name[name_len] = 0;
 415         }
 416         if (ref_tree)
 417                 ri->ref_tree = ref_tree;
 418         if (root_offset)
 419                 ri->root_offset = root_offset;
 420         if (flags)
 421                 ri->flags = flags;
 422         if (dir_id)
 423                 ri->dir_id = dir_id;
 424         if (gen)
 425                 ri->gen = gen;
 426         if (ogen)
 427                 ri->ogen = ogen;
 428         if (!ri->ogen && root_offset)
 429                 ri->ogen = root_offset;
 430         if (ot)
 431                 ri->otime = ot;
 432         if (uuid)
 433                 memcpy(&ri->uuid, uuid, BTRFS_UUID_SIZE);
 434         if (puuid)
 435                 memcpy(&ri->puuid, puuid, BTRFS_UUID_SIZE);
 436
 437         return 0;
 438 }
 439
 440 /*
 441  * add_root - update the existed root, or allocate a new root and insert it
 442  *            into the lookup tree.
 443  * root_id: object id of the root
 444  * ref_tree: object id of the referring root.
 445  * root_offset: offset value of the root'key
 446  * dir_id: inode id of the directory in ref_tree where this root can be found.
 447  * name: the name of root_id in that directory
 448  * name_len: the length of name
 449  * ogen: the original generation of the root
 450  * gen: the current generation of the root
 451  * ot: the original time(create time) of the root
 452  * uuid: uuid of the root
 453  * puuid: uuid of the root parent if any
 454  */
 455 static int add_root(struct root_lookup *root_lookup,
 456                     u64 root_id, u64 ref_tree, u64 root_offset, u64 flags,
 457                     u64 dir_id, char *name, int name_len, u64 ogen, u64 gen,
 458                     time_t ot, void *uuid, void *puuid)
 459 {
 460         struct root_info *ri;
 461         int ret;
 462
 463         ret = update_root(root_lookup, root_id, ref_tree, root_offset, flags,
 464                           dir_id, name, name_len, ogen, gen, ot, uuid, puuid);
 465         if (!ret)
 466                 return 0;
 467
 468         ri = malloc(sizeof(*ri));
 469         if (!ri) {
 470                 printf("memory allocation failed\n");
 471                 exit(1);
 472         }
 473         memset(ri, 0, sizeof(*ri));
 474         ri->root_id = root_id;
 475
 476         if (name && name_len > 0) {
 477                 ri->name = malloc(name_len + 1);
 478                 if (!ri->name) {
 479                         fprintf(stderr, "memory allocation failed\n");
 480                         exit(1);
 481                 }
 482                 strncpy(ri->name, name, name_len);
 483                 ri->name[name_len] = 0;
 484         }
 485         if (ref_tree)
 486                 ri->ref_tree = ref_tree;
 487         if (dir_id)
 488                 ri->dir_id = dir_id;
 489         if (root_offset)
 490                 ri->root_offset = root_offset;
 491         if (flags)
 492                 ri->flags = flags;
 493         if (gen)
 494                 ri->gen = gen;
 495         if (ogen)
 496                 ri->ogen = ogen;
 497         if (!ri->ogen && root_offset)
 498                 ri->ogen = root_offset;
 499         if (ot)
 500                 ri->otime = ot;
 501
 502         if (uuid)
 503                 memcpy(&ri->uuid, uuid, BTRFS_UUID_SIZE);
 504
 505         if (puuid)
 506                 memcpy(&ri->puuid, puuid, BTRFS_UUID_SIZE);
 507
 508         ret = root_tree_insert(root_lookup, ri);
 509         if (ret) {
 510                 printf("failed to insert tree %llu\n", (unsigned long long)root_id);
 511                 exit(1);
 512         }
 513         return 0;
 514 }
 515
 516 void __free_root_info(struct root_info *ri)
 517 {
 518         if (ri->name)
 519                 free(ri->name);
 520
 521         if (ri->path)
 522                 free(ri->path);
 523
 524         if (ri->full_path)
 525                 free(ri->full_path);
 526
 527         free(ri);
 528 }
 529
 530 void __free_all_subvolumn(struct root_lookup *root_tree)
 531 {
 532         struct root_info *entry;
 533         struct rb_node *n;
 534
 535         n = rb_first(&root_tree->root);
 536         while (n) {
 537                 entry = rb_entry(n, struct root_info, rb_node);
 538                 rb_erase(n, &root_tree->root);
 539                 __free_root_info(entry);
 540
 541                 n = rb_first(&root_tree->root);
 542         }
 543 }
 544
 545 /*
 546  * for a given root_info, search through the root_lookup tree to construct
 547  * the full path name to it.
 548  *
 549  * This can't be called until all the root_info->path fields are filled
 550  * in by lookup_ino_path
 551  */
 552 static int resolve_root(struct root_lookup *rl, struct root_info *ri,
 553                        u64 top_id)
 554 {
 555         char *full_path = NULL;
 556         int len = 0;
 557         struct root_info *found;
 558
 559         /*
 560          * we go backwards from the root_info object and add pathnames
 561          * from parent directories as we go.
 562          */
 563         found = ri;
 564         while (1) {
 565                 char *tmp;
 566                 u64 next;
 567                 /*
 568                 * ref_tree = 0 indicates the subvolumes
 569                 * has been deleted.
 570                 */
 571                 if (!found->ref_tree)
 572                         return -ENOENT;
 573                 int add_len = strlen(found->path);
 574
 575                 /* room for / and for null */
 576                 tmp = malloc(add_len + 2 + len);
 577                 if (!tmp) {
 578                         perror("malloc failed");
 579                         exit(1);
 580                 }
 581                 if (full_path) {
 582                         memcpy(tmp + add_len + 1, full_path, len);
 583                         tmp[add_len] = '/';
 584                         memcpy(tmp, found->path, add_len);
 585                         tmp [add_len + len + 1] = '\0';
 586                         free(full_path);
 587                         full_path = tmp;
 588                         len += add_len + 1;
 589                 } else {
 590                         full_path = strdup(found->path);
 591                         len = add_len;
 592                 }
 593
 594                 next = found->ref_tree;
 595
 596                 if (next ==  top_id) {
 597                         ri->top_id = top_id;
 598                         break;
 599                 }
 600
 601                 /*
 602                 * if the ref_tree = BTRFS_FS_TREE_OBJECTID,
 603                 * we are at the top
 604                 */
 605                 if (next == BTRFS_FS_TREE_OBJECTID) {
 606                         ri->top_id = next;
 607                         break;
 608                 }
 609
 610                 /*
 611                 * if the ref_tree wasn't in our tree of roots, the
 612                 * subvolume was deleted.
 613                 */
 614                 found = root_tree_search(rl, next);
 615                 if (!found)
 616                         return -ENOENT;
 617         }
 618
 619         ri->full_path = full_path;
 620
 621         return 0;
 622 }
 623
 624 /*
 625  * for a single root_info, ask the kernel to give us a path name
 626  * inside it's ref_root for the dir_id where it lives.
 627  *
 628  * This fills in root_info->path with the path to the directory and and
 629  * appends this root's name.
 630  */
 631 static int lookup_ino_path(int fd, struct root_info *ri)
 632 {
 633         struct btrfs_ioctl_ino_lookup_args args;
 634         int ret, e;
 635
 636         if (ri->path)
 637                 return 0;
 638
 639         if (!ri->ref_tree)
 640                 return -ENOENT;
 641
 642         memset(&args, 0, sizeof(args));
 643         args.treeid = ri->ref_tree;
 644         args.objectid = ri->dir_id;
 645
 646         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
 647         e = errno;
 648         if (ret) {
 649                 if (e == ENOENT) {
 650                         ri->ref_tree = 0;
 651                         return -ENOENT;
 652                 }
 653                 fprintf(stderr, "ERROR: Failed to lookup path for root %llu - %s\n",
 654                         (unsigned long long)ri->ref_tree,
 655                         strerror(e));
 656                 return ret;
 657         }
 658
 659         if (args.name[0]) {
 660                 /*
 661                  * we're in a subdirectory of ref_tree, the kernel ioctl
 662                  * puts a / in there for us
 663                  */
 664                 ri->path = malloc(strlen(ri->name) + strlen(args.name) + 1);
 665                 if (!ri->path) {
 666                         perror("malloc failed");
 667                         exit(1);
 668                 }
 669                 strcpy(ri->path, args.name);
 670                 strcat(ri->path, ri->name);
 671         } else {
 672                 /* we're at the root of ref_tree */
 673                 ri->path = strdup(ri->name);
 674                 if (!ri->path) {
 675                         perror("strdup failed");
 676                         exit(1);
 677                 }
 678         }
 679         return 0;
 680 }
 681
 682 /* finding the generation for a given path is a two step process.
 683  * First we use the inode loookup routine to find out the root id
 684  *
 685  * Then we use the tree search ioctl to scan all the root items for a
 686  * given root id and spit out the latest generation we can find
 687  */
 688 static u64 find_root_gen(int fd)
 689 {
 690         struct btrfs_ioctl_ino_lookup_args ino_args;
 691         int ret;
 692         struct btrfs_ioctl_search_args args;
 693         struct btrfs_ioctl_search_key *sk = &args.key;
 694         struct btrfs_ioctl_search_header sh;
 695         unsigned long off = 0;
 696         u64 max_found = 0;
 697         int i;
 698         int e;
 699
 700         memset(&ino_args, 0, sizeof(ino_args));
 701         ino_args.objectid = BTRFS_FIRST_FREE_OBJECTID;
 702
 703         /* this ioctl fills in ino_args->treeid */
 704         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &ino_args);
 705         e = errno;
 706         if (ret) {
 707                 fprintf(stderr, "ERROR: Failed to lookup path for dirid %llu - %s\n",
 708                         (unsigned long long)BTRFS_FIRST_FREE_OBJECTID,
 709                         strerror(e));
 710                 return 0;
 711         }
 712
 713         memset(&args, 0, sizeof(args));
 714
 715         sk->tree_id = 1;
 716
 717         /*
 718          * there may be more than one ROOT_ITEM key if there are
 719          * snapshots pending deletion, we have to loop through
 720          * them.
 721          */
 722         sk->min_objectid = ino_args.treeid;
 723         sk->max_objectid = ino_args.treeid;
 724         sk->max_type = BTRFS_ROOT_ITEM_KEY;
 725         sk->min_type = BTRFS_ROOT_ITEM_KEY;
 726         sk->max_offset = (u64)-1;
 727         sk->max_transid = (u64)-1;
 728         sk->nr_items = 4096;
 729
 730         while (1) {
 731                 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 732                 e = errno;
 733                 if (ret < 0) {
 734                         fprintf(stderr, "ERROR: can't perform the search - %s\n",
 735                                 strerror(e));
 736                         return 0;
 737                 }
 738                 /* the ioctl returns the number of item it found in nr_items */
 739                 if (sk->nr_items == 0)
 740                         break;
 741
 742                 off = 0;
 743                 for (i = 0; i < sk->nr_items; i++) {
 744                         struct btrfs_root_item *item;
 745
 746                         memcpy(&sh, args.buf + off, sizeof(sh));
 747                         off += sizeof(sh);
 748                         item = (struct btrfs_root_item *)(args.buf + off);
 749                         off += sh.len;
 750
 751                         sk->min_objectid = sh.objectid;
 752                         sk->min_type = sh.type;
 753                         sk->min_offset = sh.offset;
 754
 755                         if (sh.objectid > ino_args.treeid)
 756                                 break;
 757
 758                         if (sh.objectid == ino_args.treeid &&
 759                             sh.type == BTRFS_ROOT_ITEM_KEY) {
 760                                 max_found = max(max_found,
 761                                                 btrfs_root_generation(item));
 762                         }
 763                 }
 764                 if (sk->min_offset < (u64)-1)
 765                         sk->min_offset++;
 766                 else
 767                         break;
 768
 769                 if (sk->min_type != BTRFS_ROOT_ITEM_KEY)
 770                         break;
 771                 if (sk->min_objectid != BTRFS_ROOT_ITEM_KEY)
 772                         break;
 773         }
 774         return max_found;
 775 }
 776
 777 /* pass in a directory id and this will return
 778  * the full path of the parent directory inside its
 779  * subvolume root.
 780  *
 781  * It may return NULL if it is in the root, or an ERR_PTR if things
 782  * go badly.
 783  */
 784 static char *__ino_resolve(int fd, u64 dirid)
 785 {
 786         struct btrfs_ioctl_ino_lookup_args args;
 787         int ret;
 788         char *full;
 789         int e;
 790
 791         memset(&args, 0, sizeof(args));
 792         args.objectid = dirid;
 793
 794         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
 795         e = errno;
 796         if (ret) {
 797                 fprintf(stderr, "ERROR: Failed to lookup path for dirid %llu - %s\n",
 798                         (unsigned long long)dirid, strerror(e) );
 799                 return ERR_PTR(ret);
 800         }
 801
 802         if (args.name[0]) {
 803                 /*
 804                  * we're in a subdirectory of ref_tree, the kernel ioctl
 805                  * puts a / in there for us
 806                  */
 807                 full = strdup(args.name);
 808                 if (!full) {
 809                         perror("malloc failed");
 810                         return ERR_PTR(-ENOMEM);
 811                 }
 812         } else {
 813                 /* we're at the root of ref_tree */
 814                 full = NULL;
 815         }
 816         return full;
 817 }
 818
 819 /*
 820  * simple string builder, returning a new string with both
 821  * dirid and name
 822  */
 823 char *build_name(char *dirid, char *name)
 824 {
 825         char *full;
 826         if (!dirid)
 827                 return strdup(name);
 828
 829         full = malloc(strlen(dirid) + strlen(name) + 1);
 830         if (!full)
 831                 return NULL;
 832         strcpy(full, dirid);
 833         strcat(full, name);
 834         return full;
 835 }
 836
 837 /*
 838  * given an inode number, this returns the full path name inside the subvolume
 839  * to that file/directory.  cache_dirid and cache_name are used to
 840  * cache the results so we can avoid tree searches if a later call goes
 841  * to the same directory or file name
 842  */
 843 static char *ino_resolve(int fd, u64 ino, u64 *cache_dirid, char **cache_name)
 844
 845 {
 846         u64 dirid;
 847         char *dirname;
 848         char *name;
 849         char *full;
 850         int ret;
 851         struct btrfs_ioctl_search_args args;
 852         struct btrfs_ioctl_search_key *sk = &args.key;
 853         struct btrfs_ioctl_search_header *sh;
 854         unsigned long off = 0;
 855         int namelen;
 856         int e;
 857
 858         memset(&args, 0, sizeof(args));
 859
 860         sk->tree_id = 0;
 861
 862         /*
 863          * step one, we search for the inode back ref.  We just use the first
 864          * one
 865          */
 866         sk->min_objectid = ino;
 867         sk->max_objectid = ino;
 868         sk->max_type = BTRFS_INODE_REF_KEY;
 869         sk->max_offset = (u64)-1;
 870         sk->min_type = BTRFS_INODE_REF_KEY;
 871         sk->max_transid = (u64)-1;
 872         sk->nr_items = 1;
 873
 874         ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 875         e = errno;
 876         if (ret < 0) {
 877                 fprintf(stderr, "ERROR: can't perform the search - %s\n",
 878                         strerror(e));
 879                 return NULL;
 880         }
 881         /* the ioctl returns the number of item it found in nr_items */
 882         if (sk->nr_items == 0)
 883                 return NULL;
 884
 885         off = 0;
 886         sh = (struct btrfs_ioctl_search_header *)(args.buf + off);
 887
 888         if (sh->type == BTRFS_INODE_REF_KEY) {
 889                 struct btrfs_inode_ref *ref;
 890                 dirid = sh->offset;
 891
 892                 ref = (struct btrfs_inode_ref *)(sh + 1);
 893                 namelen = btrfs_stack_inode_ref_name_len(ref);
 894
 895                 name = (char *)(ref + 1);
 896                 name = strndup(name, namelen);
 897
 898                 /* use our cached value */
 899                 if (dirid == *cache_dirid && *cache_name) {
 900                         dirname = *cache_name;
 901                         goto build;
 902                 }
 903         } else {
 904                 return NULL;
 905         }
 906         /*
 907          * the inode backref gives us the file name and the parent directory id.
 908          * From here we use __ino_resolve to get the path to the parent
 909          */
 910         dirname = __ino_resolve(fd, dirid);
 911 build:
 912         full = build_name(dirname, name);
 913         if (*cache_name && dirname != *cache_name)
 914                 free(*cache_name);
 915
 916         *cache_name = dirname;
 917         *cache_dirid = dirid;
 918         free(name);
 919
 920         return full;
 921 }
 922
 923 int btrfs_list_get_default_subvolume(int fd, u64 *default_id)
 924 {
 925         struct btrfs_ioctl_search_args args;
 926         struct btrfs_ioctl_search_key *sk = &args.key;
 927         struct btrfs_ioctl_search_header *sh;
 928         u64 found = 0;
 929         int ret;
 930
 931         memset(&args, 0, sizeof(args));
 932
 933         /*
 934          * search for a dir item with a name 'default' in the tree of
 935          * tree roots, it should point us to a default root
 936          */
 937         sk->tree_id = 1;
 938
 939         /* don't worry about ancient format and request only one item */
 940         sk->nr_items = 1;
 941
 942         sk->max_objectid = BTRFS_ROOT_TREE_DIR_OBJECTID;
 943         sk->min_objectid = BTRFS_ROOT_TREE_DIR_OBJECTID;
 944         sk->max_type = BTRFS_DIR_ITEM_KEY;
 945         sk->min_type = BTRFS_DIR_ITEM_KEY;
 946         sk->max_offset = (u64)-1;
 947         sk->max_transid = (u64)-1;
 948
 949         ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 950         if (ret < 0)
 951                 return ret;
 952
 953         /* the ioctl returns the number of items it found in nr_items */
 954         if (sk->nr_items == 0)
 955                 goto out;
 956
 957         sh = (struct btrfs_ioctl_search_header *)args.buf;
 958
 959         if (sh->type == BTRFS_DIR_ITEM_KEY) {
 960                 struct btrfs_dir_item *di;
 961                 int name_len;
 962                 char *name;
 963
 964                 di = (struct btrfs_dir_item *)(sh + 1);
 965                 name_len = btrfs_stack_dir_name_len(di);
 966                 name = (char *)(di + 1);
 967
 968                 if (!strncmp("default", name, name_len))
 969                         found = btrfs_disk_key_objectid(&di->location);
 970         }
 971
 972 out:
 973         *default_id = found;
 974         return 0;
 975 }
 976
 977 static int __list_subvol_search(int fd, struct root_lookup *root_lookup)
 978 {
 979         int ret;
 980         struct btrfs_ioctl_search_args args;
 981         struct btrfs_ioctl_search_key *sk = &args.key;
 982         struct btrfs_ioctl_search_header sh;
 983         struct btrfs_root_ref *ref;
 984         struct btrfs_root_item *ri;
 985         unsigned long off = 0;
 986         int name_len;
 987         char *name;
 988         u64 dir_id;
 989         u64 gen = 0;
 990         u64 ogen;
 991         u64 flags;
 992         int i;
 993         time_t t;
 994         u8 uuid[BTRFS_UUID_SIZE];
 995         u8 puuid[BTRFS_UUID_SIZE];
 996
 997         root_lookup_init(root_lookup);
 998         memset(&args, 0, sizeof(args));
 999
1000         /* search in the tree of tree roots */
1001         sk->tree_id = 1;
1002
1003         /*
1004          * set the min and max to backref keys.  The search will
1005          * only send back this type of key now.
1006          */
1007         sk->max_type = BTRFS_ROOT_BACKREF_KEY;
1008         sk->min_type = BTRFS_ROOT_ITEM_KEY;
1009
1010         sk->min_objectid = BTRFS_FIRST_FREE_OBJECTID;
1011
1012         /*
1013          * set all the other params to the max, we'll take any objectid
1014          * and any trans
1015          */
1016         sk->max_objectid = BTRFS_LAST_FREE_OBJECTID;
1017         sk->max_offset = (u64)-1;
1018         sk->max_transid = (u64)-1;
1019
1020         /* just a big number, doesn't matter much */
1021         sk->nr_items = 4096;
1022
1023         while(1) {
1024                 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
1025                 if (ret < 0)
1026                         return ret;
1027                 /* the ioctl returns the number of item it found in nr_items */
1028                 if (sk->nr_items == 0)
1029                         break;
1030
1031                 off = 0;
1032
1033                 /*
1034                  * for each item, pull the key out of the header and then
1035                  * read the root_ref item it contains
1036                  */
1037                 for (i = 0; i < sk->nr_items; i++) {
1038                         memcpy(&sh, args.buf + off, sizeof(sh));
1039                         off += sizeof(sh);
1040                         if (sh.type == BTRFS_ROOT_BACKREF_KEY) {
1041                                 ref = (struct btrfs_root_ref *)(args.buf + off);
1042                                 name_len = btrfs_stack_root_ref_name_len(ref);
1043                                 name = (char *)(ref + 1);
1044                                 dir_id = btrfs_stack_root_ref_dirid(ref);
1045
1046                                 add_root(root_lookup, sh.objectid, sh.offset,
1047                                          0, 0, dir_id, name, name_len, 0, 0, 0,
1048                                          NULL, NULL);
1049                         } else if (sh.type == BTRFS_ROOT_ITEM_KEY) {
1050                                 ri = (struct btrfs_root_item *)(args.buf + off);
1051                                 gen = btrfs_root_generation(ri);
1052                                 flags = btrfs_root_flags(ri);
1053                                 if(sh.len >
1054                                    sizeof(struct btrfs_root_item_v0)) {
1055                                         t = ri->otime.sec;
1056                                         ogen = btrfs_root_otransid(ri);
1057                                         memcpy(uuid, ri->uuid, BTRFS_UUID_SIZE);
1058                                         memcpy(puuid, ri->parent_uuid, BTRFS_UUID_SIZE);
1059                                 } else {
1060                                         t = 0;
1061                                         ogen = 0;
1062                                         memset(uuid, 0, BTRFS_UUID_SIZE);
1063                                         memset(puuid, 0, BTRFS_UUID_SIZE);
1064                                 }
1065
1066                                 add_root(root_lookup, sh.objectid, 0,
1067                                          sh.offset, flags, 0, NULL, 0, ogen,
1068                                          gen, t, uuid, puuid);
1069                         }
1070
1071                         off += sh.len;
1072
1073                         /*
1074                          * record the mins in sk so we can make sure the
1075                          * next search doesn't repeat this root
1076                          */
1077                         sk->min_objectid = sh.objectid;
1078                         sk->min_type = sh.type;
1079                         sk->min_offset = sh.offset;
1080                 }
1081                 sk->nr_items = 4096;
1082                 sk->min_offset++;
1083                 if (!sk->min_offset)    /* overflow */
1084                         sk->min_type++;
1085                 else
1086                         continue;
1087
1088                 if (sk->min_type > BTRFS_ROOT_BACKREF_KEY) {
1089                         sk->min_type = BTRFS_ROOT_ITEM_KEY;
1090                         sk->min_objectid++;
1091                 } else
1092                         continue;
1093
1094                 if (sk->min_objectid > sk->max_objectid)
1095                         break;
1096         }
1097
1098         return 0;
1099 }
1100
1101 static int filter_by_rootid(struct root_info *ri, u64 data)
1102 {
1103         return ri->root_id == data;
1104 }
1105
1106 static int filter_snapshot(struct root_info *ri, u64 data)
1107 {
1108         return !!ri->root_offset;
1109 }
1110
1111 static int filter_flags(struct root_info *ri, u64 flags)
1112 {
1113         return ri->flags & flags;
1114 }
1115
1116 static int filter_gen_more(struct root_info *ri, u64 data)
1117 {
1118         return ri->gen >= data;
1119 }
1120
1121 static int filter_gen_less(struct root_info *ri, u64 data)
1122 {
1123         return ri->gen <= data;
1124 }
1125
1126 static int filter_gen_equal(struct root_info  *ri, u64 data)
1127 {
1128         return ri->gen == data;
1129 }
1130
1131 static int filter_cgen_more(struct root_info *ri, u64 data)
1132 {
1133         return ri->ogen >= data;
1134 }
1135
1136 static int filter_cgen_less(struct root_info *ri, u64 data)
1137 {
1138         return ri->ogen <= data;
1139 }
1140
1141 static int filter_cgen_equal(struct root_info *ri, u64 data)
1142 {
1143         return ri->ogen == data;
1144 }
1145
1146 static int filter_topid_equal(struct root_info *ri, u64 data)
1147 {
1148         return ri->top_id == data;
1149 }
1150
1151 static int filter_full_path(struct root_info *ri, u64 data)
1152 {
1153         if (ri->full_path && ri->top_id != data) {
1154                 char *tmp;
1155                 char p[] = "<FS_TREE>";
1156                 int add_len = strlen(p);
1157                 int len = strlen(ri->full_path);
1158
1159                 tmp = malloc(len + add_len + 2);
1160                 if (!tmp) {
1161                         fprintf(stderr, "memory allocation failed\n");
1162                         exit(1);
1163                 }
1164                 memcpy(tmp + add_len + 1, ri->full_path, len);
1165                 tmp[len + add_len + 1] = '\0';
1166                 tmp[add_len] = '/';
1167                 memcpy(tmp, p, add_len);
1168                 free(ri->full_path);
1169                 ri->full_path = tmp;
1170         }
1171         return 1;
1172 }
1173
1174 static int filter_by_parent(struct root_info *ri, u64 data)
1175 {
1176         return !uuid_compare(ri->puuid, (u8 *)data);
1177 }
1178
1179 static btrfs_list_filter_func all_filter_funcs[] = {
1180         [BTRFS_LIST_FILTER_ROOTID]              = filter_by_rootid,
1181         [BTRFS_LIST_FILTER_SNAPSHOT_ONLY]       = filter_snapshot,
1182         [BTRFS_LIST_FILTER_FLAGS]               = filter_flags,
1183         [BTRFS_LIST_FILTER_GEN_MORE]            = filter_gen_more,
1184         [BTRFS_LIST_FILTER_GEN_LESS]            = filter_gen_less,
1185         [BTRFS_LIST_FILTER_GEN_EQUAL]           = filter_gen_equal,
1186         [BTRFS_LIST_FILTER_CGEN_MORE]           = filter_cgen_more,
1187         [BTRFS_LIST_FILTER_CGEN_LESS]           = filter_cgen_less,
1188         [BTRFS_LIST_FILTER_CGEN_EQUAL]          = filter_cgen_equal,
1189         [BTRFS_LIST_FILTER_TOPID_EQUAL]         = filter_topid_equal,
1190         [BTRFS_LIST_FILTER_FULL_PATH]           = filter_full_path,
1191         [BTRFS_LIST_FILTER_BY_PARENT]           = filter_by_parent,
1192 };
1193
1194 struct btrfs_list_filter_set *btrfs_list_alloc_filter_set(void)
1195 {
1196         struct btrfs_list_filter_set *set;
1197         int size;
1198
1199         size = sizeof(struct btrfs_list_filter_set) +
1200                BTRFS_LIST_NFILTERS_INCREASE * sizeof(struct btrfs_list_filter);
1201         set = malloc(size);
1202         if (!set) {
1203                 fprintf(stderr, "memory allocation failed\n");
1204                 exit(1);
1205         }
1206
1207         memset(set, 0, size);
1208         set->total = BTRFS_LIST_NFILTERS_INCREASE;
1209
1210         return set;
1211 }
1212
1213 void btrfs_list_free_filter_set(struct btrfs_list_filter_set *filter_set)
1214 {
1215         free(filter_set);
1216 }
1217
1218 int btrfs_list_setup_filter(struct btrfs_list_filter_set **filter_set,
1219                             enum btrfs_list_filter_enum filter, u64 data)
1220 {
1221         struct btrfs_list_filter_set *set = *filter_set;
1222         int size;
1223
1224         BUG_ON(!set);
1225         BUG_ON(filter >= BTRFS_LIST_FILTER_MAX);
1226         BUG_ON(set->nfilters > set->total);
1227
1228         if (set->nfilters == set->total) {
1229                 size = set->total + BTRFS_LIST_NFILTERS_INCREASE;
1230                 size = sizeof(*set) + size * sizeof(struct btrfs_list_filter);
1231                 set = realloc(set, size);
1232                 if (!set) {
1233                         fprintf(stderr, "memory allocation failed\n");
1234                         exit(1);
1235                 }
1236
1237                 memset(&set->filters[set->total], 0,
1238                        BTRFS_LIST_NFILTERS_INCREASE *
1239                        sizeof(struct btrfs_list_filter));
1240                 set->total += BTRFS_LIST_NFILTERS_INCREASE;
1241                 *filter_set = set;
1242         }
1243
1244         BUG_ON(set->filters[set->nfilters].filter_func);
1245
1246         set->filters[set->nfilters].filter_func = all_filter_funcs[filter];
1247         set->filters[set->nfilters].data = data;
1248         set->nfilters++;
1249         return 0;
1250 }
1251
1252 static int filter_root(struct root_info *ri,
1253                        struct btrfs_list_filter_set *set)
1254 {
1255         int i, ret;
1256
1257         if (!set || !set->nfilters)
1258                 return 1;
1259
1260         for (i = 0; i < set->nfilters; i++) {
1261                 if (!set->filters[i].filter_func)
1262                         break;
1263                 ret = set->filters[i].filter_func(ri, set->filters[i].data);
1264                 if (!ret)
1265                         return 0;
1266         }
1267         return 1;
1268 }
1269
1270 static void __filter_and_sort_subvol(struct root_lookup *all_subvols,
1271                                     struct root_lookup *sort_tree,
1272                                     struct btrfs_list_filter_set *filter_set,
1273                                     struct btrfs_list_comparer_set *comp_set,
1274                                     u64 top_id)
1275 {
1276         struct rb_node *n;
1277         struct root_info *entry;
1278         int ret;
1279
1280         root_lookup_init(sort_tree);
1281
1282         n = rb_last(&all_subvols->root);
1283         while (n) {
1284                 entry = rb_entry(n, struct root_info, rb_node);
1285
1286                 ret = resolve_root(all_subvols, entry, top_id);
1287                 if (ret == -ENOENT)
1288                         goto skip;
1289                 ret = filter_root(entry, filter_set);
1290                 if (ret)
1291                         sort_tree_insert(sort_tree, entry, comp_set);
1292 skip:
1293                 n = rb_prev(n);
1294         }
1295 }
1296
1297 static int __list_subvol_fill_paths(int fd, struct root_lookup *root_lookup)
1298 {
1299         struct rb_node *n;
1300
1301         n = rb_first(&root_lookup->root);
1302         while (n) {
1303                 struct root_info *entry;
1304                 int ret;
1305                 entry = rb_entry(n, struct root_info, rb_node);
1306                 ret = lookup_ino_path(fd, entry);
1307                 if (ret && ret != -ENOENT)
1308                         return ret;
1309                 n = rb_next(n);
1310         }
1311
1312         return 0;
1313 }
1314
1315 static void print_subvolume_column(struct root_info *subv,
1316                                    enum btrfs_list_column_enum column)
1317 {
1318         char tstr[256];
1319         char uuidparse[37];
1320
1321         BUG_ON(column >= BTRFS_LIST_ALL || column < 0);
1322
1323         switch (column) {
1324         case BTRFS_LIST_OBJECTID:
1325                 printf("%llu", subv->root_id);
1326                 break;
1327         case BTRFS_LIST_GENERATION:
1328                 printf("%llu", subv->gen);
1329                 break;
1330         case BTRFS_LIST_OGENERATION:
1331                 printf("%llu", subv->ogen);
1332                 break;
1333         case BTRFS_LIST_PARENT:
1334                 printf("%llu", subv->ref_tree);
1335                 break;
1336         case BTRFS_LIST_TOP_LEVEL:
1337                 printf("%llu", subv->top_id);
1338                 break;
1339         case BTRFS_LIST_OTIME:
1340                 if (subv->otime)
1341                         strftime(tstr, 256, "%Y-%m-%d %X",
1342                                  localtime(&subv->otime));
1343                 else
1344                         strcpy(tstr, "-");
1345                 printf("%s", tstr);
1346                 break;
1347         case BTRFS_LIST_UUID:
1348                 if (uuid_is_null(subv->uuid))
1349                         strcpy(uuidparse, "-");
1350                 else
1351                         uuid_unparse(subv->uuid, uuidparse);
1352                 printf("%s", uuidparse);
1353                 break;
1354         case BTRFS_LIST_PUUID:
1355                 if (uuid_is_null(subv->puuid))
1356                         strcpy(uuidparse, "-");
1357                 else
1358                         uuid_unparse(subv->puuid, uuidparse);
1359                 printf("%s", uuidparse);
1360                 break;
1361         case BTRFS_LIST_PATH:
1362                 BUG_ON(!subv->full_path);
1363                 printf("%s", subv->full_path);
1364                 break;
1365         default:
1366                 break;
1367         }
1368 }
1369
1370 static void print_single_volume_info_raw(struct root_info *subv, char *raw_prefix)
1371 {
1372         int i;
1373
1374         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1375                 if (!btrfs_list_columns[i].need_print)
1376                         continue;
1377
1378                 if (raw_prefix)
1379                         printf("%s",raw_prefix);
1380
1381                 print_subvolume_column(subv, i);
1382         }
1383         printf("\n");
1384 }
1385
1386 static void print_single_volume_info_table(struct root_info *subv)
1387 {
1388         int i;
1389
1390         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1391                 if (!btrfs_list_columns[i].need_print)
1392                         continue;
1393
1394                 print_subvolume_column(subv, i);
1395
1396                 if (i != BTRFS_LIST_PATH)
1397                         printf("\t");
1398
1399                 if (i == BTRFS_LIST_TOP_LEVEL)
1400                         printf("\t");
1401         }
1402         printf("\n");
1403 }
1404
1405 static void print_single_volume_info_default(struct root_info *subv)
1406 {
1407         int i;
1408
1409         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1410                 if (!btrfs_list_columns[i].need_print)
1411                         continue;
1412
1413                 printf("%s ", btrfs_list_columns[i].name);
1414                 print_subvolume_column(subv, i);
1415
1416                 if (i != BTRFS_LIST_PATH)
1417                         printf(" ");
1418         }
1419         printf("\n");
1420 }
1421
1422 static void print_all_volume_info_tab_head()
1423 {
1424         int i;
1425         int len;
1426         char barrier[20];
1427
1428         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1429                 if (btrfs_list_columns[i].need_print)
1430                         printf("%s\t", btrfs_list_columns[i].name);
1431
1432                 if (i == BTRFS_LIST_ALL-1)
1433                         printf("\n");
1434         }
1435
1436         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1437                 memset(barrier, 0, sizeof(barrier));
1438
1439                 if (btrfs_list_columns[i].need_print) {
1440                         len = strlen(btrfs_list_columns[i].name);
1441                         while (len--)
1442                                 strcat(barrier, "-");
1443
1444                         printf("%s\t", barrier);
1445                 }
1446                 if (i == BTRFS_LIST_ALL-1)
1447                         printf("\n");
1448         }
1449 }
1450
1451 static void print_all_volume_info(struct root_lookup *sorted_tree,
1452                                   int layout, char *raw_prefix)
1453 {
1454         struct rb_node *n;
1455         struct root_info *entry;
1456
1457         if (layout == BTRFS_LIST_LAYOUT_TABLE)
1458                 print_all_volume_info_tab_head();
1459
1460         n = rb_first(&sorted_tree->root);
1461         while (n) {
1462                 entry = rb_entry(n, struct root_info, sort_node);
1463                 switch (layout) {
1464                 case BTRFS_LIST_LAYOUT_DEFAULT:
1465                         print_single_volume_info_default(entry);
1466                         break;
1467                 case BTRFS_LIST_LAYOUT_TABLE:
1468                         print_single_volume_info_table(entry);
1469                         break;
1470                 case BTRFS_LIST_LAYOUT_RAW:
1471                         print_single_volume_info_raw(entry, raw_prefix);
1472                         break;
1473                 }
1474                 n = rb_next(n);
1475         }
1476 }
1477
1478 int btrfs_list_subvols(int fd, struct root_lookup *root_lookup)
1479 {
1480         int ret;
1481
1482         ret = __list_subvol_search(fd, root_lookup);
1483         if (ret) {
1484                 fprintf(stderr, "ERROR: can't perform the search - %s\n",
1485                                 strerror(errno));
1486                 return ret;
1487         }
1488
1489         /*
1490          * now we have an rbtree full of root_info objects, but we need to fill
1491          * in their path names within the subvol that is referencing each one.
1492          */
1493         ret = __list_subvol_fill_paths(fd, root_lookup);
1494         return ret;
1495 }
1496
1497 int btrfs_list_subvols_print(int fd, struct btrfs_list_filter_set *filter_set,
1498                        struct btrfs_list_comparer_set *comp_set,
1499                        int layout, int full_path, char *raw_prefix)
1500 {
1501         struct root_lookup root_lookup;
1502         struct root_lookup root_sort;
1503         int ret;
1504         u64 top_id = (full_path ? 0 : btrfs_list_get_path_rootid(fd));
1505
1506         ret = btrfs_list_subvols(fd, &root_lookup);
1507         if (ret)
1508                 return ret;
1509         __filter_and_sort_subvol(&root_lookup, &root_sort, filter_set,
1510                                  comp_set, top_id);
1511
1512         print_all_volume_info(&root_sort, layout, raw_prefix);
1513         __free_all_subvolumn(&root_lookup);
1514
1515         return 0;
1516 }
1517
1518 int btrfs_get_subvol(int fd, struct root_info *the_ri)
1519 {
1520         int ret = 1, rr;
1521         struct root_lookup rl;
1522         struct rb_node *rbn;
1523         struct root_info *ri;
1524         u64 root_id = btrfs_list_get_path_rootid(fd);
1525
1526         if (btrfs_list_subvols(fd, &rl))
1527                 return ret;
1528
1529         rbn = rb_first(&rl.root);
1530         while(rbn) {
1531                 ri = rb_entry(rbn, struct root_info, rb_node);
1532                 rr = resolve_root(&rl, ri, root_id);
1533                 if (rr == -ENOENT) {
1534                         ret = -ENOENT;
1535                         rbn = rb_next(rbn);
1536                         continue;
1537                 }
1538                 if (!comp_entry_with_rootid(the_ri, ri, 0)) {
1539                         memcpy(the_ri, ri, offsetof(struct root_info, path));
1540                         if (ri->path)
1541                                 the_ri->path = strdup(ri->path);
1542                         else
1543                                 the_ri->path = NULL;
1544                         if (ri->name)
1545                                 the_ri->name = strdup(ri->name);
1546                         else
1547                                 the_ri->name = NULL;
1548                         if (ri->full_path)
1549                                 the_ri->full_path = strdup(ri->full_path);
1550                         else
1551                                 the_ri->name = NULL;
1552                         ret = 0;
1553                         break;
1554                 }
1555                 rbn = rb_next(rbn);
1556         }
1557         __free_all_subvolumn(&rl);
1558         return ret;
1559 }
1560
1561 static int print_one_extent(int fd, struct btrfs_ioctl_search_header *sh,
1562                             struct btrfs_file_extent_item *item,
1563                             u64 found_gen, u64 *cache_dirid,
1564                             char **cache_dir_name, u64 *cache_ino,
1565                             char **cache_full_name)
1566 {
1567         u64 len = 0;
1568         u64 disk_start = 0;
1569         u64 disk_offset = 0;
1570         u8 type;
1571         int compressed = 0;
1572         int flags = 0;
1573         char *name = NULL;
1574
1575         if (sh->objectid == *cache_ino) {
1576                 name = *cache_full_name;
1577         } else if (*cache_full_name) {
1578                 free(*cache_full_name);
1579                 *cache_full_name = NULL;
1580         }
1581         if (!name) {
1582                 name = ino_resolve(fd, sh->objectid, cache_dirid,
1583                                    cache_dir_name);
1584                 *cache_full_name = name;
1585                 *cache_ino = sh->objectid;
1586         }
1587         if (!name)
1588                 return -EIO;
1589
1590         type = btrfs_stack_file_extent_type(item);
1591         compressed = btrfs_stack_file_extent_compression(item);
1592
1593         if (type == BTRFS_FILE_EXTENT_REG ||
1594             type == BTRFS_FILE_EXTENT_PREALLOC) {
1595                 disk_start = btrfs_stack_file_extent_disk_bytenr(item);
1596                 disk_offset = btrfs_stack_file_extent_offset(item);
1597                 len = btrfs_stack_file_extent_num_bytes(item);
1598         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1599                 disk_start = 0;
1600                 disk_offset = 0;
1601                 len = btrfs_stack_file_extent_ram_bytes(item);
1602         } else {
1603                 printf("unhandled extent type %d for inode %llu "
1604                        "file offset %llu gen %llu\n",
1605                         type,
1606                         (unsigned long long)sh->objectid,
1607                         (unsigned long long)sh->offset,
1608                         (unsigned long long)found_gen);
1609
1610                 return -EIO;
1611         }
1612         printf("inode %llu file offset %llu len %llu disk start %llu "
1613                "offset %llu gen %llu flags ",
1614                (unsigned long long)sh->objectid,
1615                (unsigned long long)sh->offset,
1616                (unsigned long long)len,
1617                (unsigned long long)disk_start,
1618                (unsigned long long)disk_offset,
1619                (unsigned long long)found_gen);
1620
1621         if (compressed) {
1622                 printf("COMPRESS");
1623                 flags++;
1624         }
1625         if (type == BTRFS_FILE_EXTENT_PREALLOC) {
1626                 printf("%sPREALLOC", flags ? "|" : "");
1627                 flags++;
1628         }
1629         if (type == BTRFS_FILE_EXTENT_INLINE) {
1630                 printf("%sINLINE", flags ? "|" : "");
1631                 flags++;
1632         }
1633         if (!flags)
1634                 printf("NONE");
1635
1636         printf(" %s\n", name);
1637         return 0;
1638 }
1639
1640 int btrfs_list_find_updated_files(int fd, u64 root_id, u64 oldest_gen)
1641 {
1642         int ret;
1643         struct btrfs_ioctl_search_args args;
1644         struct btrfs_ioctl_search_key *sk = &args.key;
1645         struct btrfs_ioctl_search_header sh;
1646         struct btrfs_file_extent_item *item;
1647         unsigned long off = 0;
1648         u64 found_gen;
1649         u64 max_found = 0;
1650         int i;
1651         int e;
1652         u64 cache_dirid = 0;
1653         u64 cache_ino = 0;
1654         char *cache_dir_name = NULL;
1655         char *cache_full_name = NULL;
1656         struct btrfs_file_extent_item backup;
1657
1658         memset(&backup, 0, sizeof(backup));
1659         memset(&args, 0, sizeof(args));
1660
1661         sk->tree_id = root_id;
1662
1663         /*
1664          * set all the other params to the max, we'll take any objectid
1665          * and any trans
1666          */
1667         sk->max_objectid = (u64)-1;
1668         sk->max_offset = (u64)-1;
1669         sk->max_transid = (u64)-1;
1670         sk->max_type = BTRFS_EXTENT_DATA_KEY;
1671         sk->min_transid = oldest_gen;
1672         /* just a big number, doesn't matter much */
1673         sk->nr_items = 4096;
1674
1675         max_found = find_root_gen(fd);
1676         while(1) {
1677                 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
1678                 e = errno;
1679                 if (ret < 0) {
1680                         fprintf(stderr, "ERROR: can't perform the search- %s\n",
1681                                 strerror(e));
1682                         return ret;
1683                 }
1684                 /* the ioctl returns the number of item it found in nr_items */
1685                 if (sk->nr_items == 0)
1686                         break;
1687
1688                 off = 0;
1689
1690                 /*
1691                  * for each item, pull the key out of the header and then
1692                  * read the root_ref item it contains
1693                  */
1694                 for (i = 0; i < sk->nr_items; i++) {
1695                         memcpy(&sh, args.buf + off, sizeof(sh));
1696                         off += sizeof(sh);
1697
1698                         /*
1699                          * just in case the item was too big, pass something other
1700                          * than garbage
1701                          */
1702                         if (sh.len == 0)
1703                                 item = &backup;
1704                         else
1705                                 item = (struct btrfs_file_extent_item *)(args.buf +
1706                                                                  off);
1707                         found_gen = btrfs_stack_file_extent_generation(item);
1708                         if (sh.type == BTRFS_EXTENT_DATA_KEY &&
1709                             found_gen >= oldest_gen) {
1710                                 print_one_extent(fd, &sh, item, found_gen,
1711                                                  &cache_dirid, &cache_dir_name,
1712                                                  &cache_ino, &cache_full_name);
1713                         }
1714                         off += sh.len;
1715
1716                         /*
1717                          * record the mins in sk so we can make sure the
1718                          * next search doesn't repeat this root
1719                          */
1720                         sk->min_objectid = sh.objectid;
1721                         sk->min_offset = sh.offset;
1722                         sk->min_type = sh.type;
1723                 }
1724                 sk->nr_items = 4096;
1725                 if (sk->min_offset < (u64)-1)
1726                         sk->min_offset++;
1727                 else if (sk->min_objectid < (u64)-1) {
1728                         sk->min_objectid++;
1729                         sk->min_offset = 0;
1730                         sk->min_type = 0;
1731                 } else
1732                         break;
1733         }
1734         free(cache_dir_name);
1735         free(cache_full_name);
1736         printf("transid marker was %llu\n", (unsigned long long)max_found);
1737         return ret;
1738 }
1739
1740 char *btrfs_list_path_for_root(int fd, u64 root)
1741 {
1742         struct root_lookup root_lookup;
1743         struct rb_node *n;
1744         char *ret_path = NULL;
1745         int ret;
1746         u64 top_id = btrfs_list_get_path_rootid(fd);
1747
1748         ret = __list_subvol_search(fd, &root_lookup);
1749         if (ret < 0)
1750                 return ERR_PTR(ret);
1751
1752         ret = __list_subvol_fill_paths(fd, &root_lookup);
1753         if (ret < 0)
1754                 return ERR_PTR(ret);
1755
1756         n = rb_last(&root_lookup.root);
1757         while (n) {
1758                 struct root_info *entry;
1759
1760                 entry = rb_entry(n, struct root_info, rb_node);
1761                 ret = resolve_root(&root_lookup, entry, top_id);
1762                 if (ret == -ENOENT && entry->root_id == root) {
1763                         ret_path = NULL;
1764                         break;
1765                 }
1766                 if (entry->root_id == root) {
1767                         ret_path = entry->full_path;
1768                         entry->full_path = NULL;
1769                 }
1770
1771                 n = rb_prev(n);
1772         }
1773         __free_all_subvolumn(&root_lookup);
1774
1775         return ret_path;
1776 }
1777
1778 int btrfs_list_parse_sort_string(char *optarg,
1779                                  struct btrfs_list_comparer_set **comps)
1780 {
1781         int order;
1782         int flag;
1783         char *p;
1784         char **ptr_argv;
1785         int what_to_sort;
1786
1787         while ((p = strtok(optarg, ",")) != NULL) {
1788                 flag = 0;
1789                 ptr_argv = all_sort_items;
1790
1791                 while (*ptr_argv) {
1792                         if (strcmp(*ptr_argv, p) == 0) {
1793                                 flag = 1;
1794                                 break;
1795                         } else {
1796                                 p++;
1797                                 if (strcmp(*ptr_argv, p) == 0) {
1798                                         flag = 1;
1799                                         p--;
1800                                         break;
1801                                 }
1802                                 p--;
1803                         }
1804                         ptr_argv++;
1805                 }
1806
1807                 if (flag == 0)
1808                         return -1;
1809
1810                 else {
1811                         if (*p == '+') {
1812                                 order = 0;
1813                                 p++;
1814                         } else if (*p == '-') {
1815                                 order = 1;
1816                                 p++;
1817                         } else
1818                                 order = 0;
1819
1820                         what_to_sort = btrfs_list_get_sort_item(p);
1821                         btrfs_list_setup_comparer(comps, what_to_sort, order);
1822                 }
1823                 optarg = NULL;
1824         }
1825
1826         return 0;
1827 }
1828
1829 /*
1830  * This function is used to parse the argument of filter condition.
1831  *
1832  * type is the filter object.
1833  */
1834 int btrfs_list_parse_filter_string(char *optarg,
1835                                    struct btrfs_list_filter_set **filters,
1836                                    enum btrfs_list_filter_enum type)
1837 {
1838
1839         u64 arg;
1840         char *ptr_parse_end = NULL;
1841         char *ptr_optarg_end = optarg + strlen(optarg);
1842
1843         switch (*(optarg++)) {
1844         case '+':
1845                 arg = (u64)strtol(optarg, &ptr_parse_end, 10);
1846                 type += 2;
1847                 if (ptr_parse_end != ptr_optarg_end)
1848                         return -1;
1849
1850                 btrfs_list_setup_filter(filters, type, arg);
1851                 break;
1852         case '-':
1853                 arg = (u64)strtoll(optarg, &ptr_parse_end, 10);
1854                 type += 1;
1855                 if (ptr_parse_end != ptr_optarg_end)
1856                         return -1;
1857
1858                 btrfs_list_setup_filter(filters, type, arg);
1859                 break;
1860         default:
1861                 optarg--;
1862                 arg = (u64)strtoll(optarg, &ptr_parse_end, 10);
1863
1864                 if (ptr_parse_end != ptr_optarg_end)
1865                         return -1;
1866                 btrfs_list_setup_filter(filters, type, arg);
1867                 break;
1868         }
1869
1870         return 0;
1871 }
1872
1873 u64 btrfs_list_get_path_rootid(int fd)
1874 {
1875         int  ret;
1876         struct btrfs_ioctl_ino_lookup_args args;
1877
1878         memset(&args, 0, sizeof(args));
1879         args.objectid = BTRFS_FIRST_FREE_OBJECTID;
1880
1881         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
1882         if (ret < 0) {
1883                 fprintf(stderr,
1884                         "ERROR: can't perform the search -%s\n",
1885                         strerror(errno));
1886                 return ret;
1887         }
1888         return args.treeid;
1889 }