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                 int add_len = strlen(found->path);
 568
 569                 /* room for / and for null */
 570                 tmp = malloc(add_len + 2 + len);
 571                 if (!tmp) {
 572                         perror("malloc failed");
 573                         exit(1);
 574                 }
 575                 if (full_path) {
 576                         memcpy(tmp + add_len + 1, full_path, len);
 577                         tmp[add_len] = '/';
 578                         memcpy(tmp, found->path, add_len);
 579                         tmp [add_len + len + 1] = '\0';
 580                         free(full_path);
 581                         full_path = tmp;
 582                         len += add_len + 1;
 583                 } else {
 584                         full_path = strdup(found->path);
 585                         len = add_len;
 586                 }
 587
 588                 next = found->ref_tree;
 589
 590                 if (next ==  top_id) {
 591                         ri->top_id = top_id;
 592                         break;
 593                 }
 594
 595                 if (next == BTRFS_FS_TREE_OBJECTID) {
 596                         ri->top_id = next;
 597                         break;
 598                 }
 599
 600                 /*
 601                  * if the ref_tree wasn't in our tree of roots, we're
 602                  * at the top
 603                  */
 604                 found = root_tree_search(rl, next);
 605                 if (!found) {
 606                         ri->top_id = next;
 607                         break;
 608                 }
 609         }
 610
 611         ri->full_path = full_path;
 612
 613         return 0;
 614 }
 615
 616 /*
 617  * for a single root_info, ask the kernel to give us a path name
 618  * inside it's ref_root for the dir_id where it lives.
 619  *
 620  * This fills in root_info->path with the path to the directory and and
 621  * appends this root's name.
 622  */
 623 static int lookup_ino_path(int fd, struct root_info *ri)
 624 {
 625         struct btrfs_ioctl_ino_lookup_args args;
 626         int ret, e;
 627
 628         if (ri->path)
 629                 return 0;
 630
 631         memset(&args, 0, sizeof(args));
 632         args.treeid = ri->ref_tree;
 633         args.objectid = ri->dir_id;
 634
 635         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
 636         e = errno;
 637         if (ret) {
 638                 fprintf(stderr, "ERROR: Failed to lookup path for root %llu - %s\n",
 639                         (unsigned long long)ri->ref_tree,
 640                         strerror(e));
 641                 return ret;
 642         }
 643
 644         if (args.name[0]) {
 645                 /*
 646                  * we're in a subdirectory of ref_tree, the kernel ioctl
 647                  * puts a / in there for us
 648                  */
 649                 ri->path = malloc(strlen(ri->name) + strlen(args.name) + 1);
 650                 if (!ri->path) {
 651                         perror("malloc failed");
 652                         exit(1);
 653                 }
 654                 strcpy(ri->path, args.name);
 655                 strcat(ri->path, ri->name);
 656         } else {
 657                 /* we're at the root of ref_tree */
 658                 ri->path = strdup(ri->name);
 659                 if (!ri->path) {
 660                         perror("strdup failed");
 661                         exit(1);
 662                 }
 663         }
 664         return 0;
 665 }
 666
 667 /* finding the generation for a given path is a two step process.
 668  * First we use the inode loookup routine to find out the root id
 669  *
 670  * Then we use the tree search ioctl to scan all the root items for a
 671  * given root id and spit out the latest generation we can find
 672  */
 673 static u64 find_root_gen(int fd)
 674 {
 675         struct btrfs_ioctl_ino_lookup_args ino_args;
 676         int ret;
 677         struct btrfs_ioctl_search_args args;
 678         struct btrfs_ioctl_search_key *sk = &args.key;
 679         struct btrfs_ioctl_search_header sh;
 680         unsigned long off = 0;
 681         u64 max_found = 0;
 682         int i;
 683         int e;
 684
 685         memset(&ino_args, 0, sizeof(ino_args));
 686         ino_args.objectid = BTRFS_FIRST_FREE_OBJECTID;
 687
 688         /* this ioctl fills in ino_args->treeid */
 689         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &ino_args);
 690         e = errno;
 691         if (ret) {
 692                 fprintf(stderr, "ERROR: Failed to lookup path for dirid %llu - %s\n",
 693                         (unsigned long long)BTRFS_FIRST_FREE_OBJECTID,
 694                         strerror(e));
 695                 return 0;
 696         }
 697
 698         memset(&args, 0, sizeof(args));
 699
 700         sk->tree_id = 1;
 701
 702         /*
 703          * there may be more than one ROOT_ITEM key if there are
 704          * snapshots pending deletion, we have to loop through
 705          * them.
 706          */
 707         sk->min_objectid = ino_args.treeid;
 708         sk->max_objectid = ino_args.treeid;
 709         sk->max_type = BTRFS_ROOT_ITEM_KEY;
 710         sk->min_type = BTRFS_ROOT_ITEM_KEY;
 711         sk->max_offset = (u64)-1;
 712         sk->max_transid = (u64)-1;
 713         sk->nr_items = 4096;
 714
 715         while (1) {
 716                 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 717                 e = errno;
 718                 if (ret < 0) {
 719                         fprintf(stderr, "ERROR: can't perform the search - %s\n",
 720                                 strerror(e));
 721                         return 0;
 722                 }
 723                 /* the ioctl returns the number of item it found in nr_items */
 724                 if (sk->nr_items == 0)
 725                         break;
 726
 727                 off = 0;
 728                 for (i = 0; i < sk->nr_items; i++) {
 729                         struct btrfs_root_item *item;
 730
 731                         memcpy(&sh, args.buf + off, sizeof(sh));
 732                         off += sizeof(sh);
 733                         item = (struct btrfs_root_item *)(args.buf + off);
 734                         off += sh.len;
 735
 736                         sk->min_objectid = sh.objectid;
 737                         sk->min_type = sh.type;
 738                         sk->min_offset = sh.offset;
 739
 740                         if (sh.objectid > ino_args.treeid)
 741                                 break;
 742
 743                         if (sh.objectid == ino_args.treeid &&
 744                             sh.type == BTRFS_ROOT_ITEM_KEY) {
 745                                 max_found = max(max_found,
 746                                                 btrfs_root_generation(item));
 747                         }
 748                 }
 749                 if (sk->min_offset < (u64)-1)
 750                         sk->min_offset++;
 751                 else
 752                         break;
 753
 754                 if (sk->min_type != BTRFS_ROOT_ITEM_KEY)
 755                         break;
 756                 if (sk->min_objectid != BTRFS_ROOT_ITEM_KEY)
 757                         break;
 758         }
 759         return max_found;
 760 }
 761
 762 /* pass in a directory id and this will return
 763  * the full path of the parent directory inside its
 764  * subvolume root.
 765  *
 766  * It may return NULL if it is in the root, or an ERR_PTR if things
 767  * go badly.
 768  */
 769 static char *__ino_resolve(int fd, u64 dirid)
 770 {
 771         struct btrfs_ioctl_ino_lookup_args args;
 772         int ret;
 773         char *full;
 774         int e;
 775
 776         memset(&args, 0, sizeof(args));
 777         args.objectid = dirid;
 778
 779         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
 780         e = errno;
 781         if (ret) {
 782                 fprintf(stderr, "ERROR: Failed to lookup path for dirid %llu - %s\n",
 783                         (unsigned long long)dirid, strerror(e) );
 784                 return ERR_PTR(ret);
 785         }
 786
 787         if (args.name[0]) {
 788                 /*
 789                  * we're in a subdirectory of ref_tree, the kernel ioctl
 790                  * puts a / in there for us
 791                  */
 792                 full = strdup(args.name);
 793                 if (!full) {
 794                         perror("malloc failed");
 795                         return ERR_PTR(-ENOMEM);
 796                 }
 797         } else {
 798                 /* we're at the root of ref_tree */
 799                 full = NULL;
 800         }
 801         return full;
 802 }
 803
 804 /*
 805  * simple string builder, returning a new string with both
 806  * dirid and name
 807  */
 808 char *build_name(char *dirid, char *name)
 809 {
 810         char *full;
 811         if (!dirid)
 812                 return strdup(name);
 813
 814         full = malloc(strlen(dirid) + strlen(name) + 1);
 815         if (!full)
 816                 return NULL;
 817         strcpy(full, dirid);
 818         strcat(full, name);
 819         return full;
 820 }
 821
 822 /*
 823  * given an inode number, this returns the full path name inside the subvolume
 824  * to that file/directory.  cache_dirid and cache_name are used to
 825  * cache the results so we can avoid tree searches if a later call goes
 826  * to the same directory or file name
 827  */
 828 static char *ino_resolve(int fd, u64 ino, u64 *cache_dirid, char **cache_name)
 829
 830 {
 831         u64 dirid;
 832         char *dirname;
 833         char *name;
 834         char *full;
 835         int ret;
 836         struct btrfs_ioctl_search_args args;
 837         struct btrfs_ioctl_search_key *sk = &args.key;
 838         struct btrfs_ioctl_search_header *sh;
 839         unsigned long off = 0;
 840         int namelen;
 841         int e;
 842
 843         memset(&args, 0, sizeof(args));
 844
 845         sk->tree_id = 0;
 846
 847         /*
 848          * step one, we search for the inode back ref.  We just use the first
 849          * one
 850          */
 851         sk->min_objectid = ino;
 852         sk->max_objectid = ino;
 853         sk->max_type = BTRFS_INODE_REF_KEY;
 854         sk->max_offset = (u64)-1;
 855         sk->min_type = BTRFS_INODE_REF_KEY;
 856         sk->max_transid = (u64)-1;
 857         sk->nr_items = 1;
 858
 859         ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 860         e = errno;
 861         if (ret < 0) {
 862                 fprintf(stderr, "ERROR: can't perform the search - %s\n",
 863                         strerror(e));
 864                 return NULL;
 865         }
 866         /* the ioctl returns the number of item it found in nr_items */
 867         if (sk->nr_items == 0)
 868                 return NULL;
 869
 870         off = 0;
 871         sh = (struct btrfs_ioctl_search_header *)(args.buf + off);
 872
 873         if (sh->type == BTRFS_INODE_REF_KEY) {
 874                 struct btrfs_inode_ref *ref;
 875                 dirid = sh->offset;
 876
 877                 ref = (struct btrfs_inode_ref *)(sh + 1);
 878                 namelen = btrfs_stack_inode_ref_name_len(ref);
 879
 880                 name = (char *)(ref + 1);
 881                 name = strndup(name, namelen);
 882
 883                 /* use our cached value */
 884                 if (dirid == *cache_dirid && *cache_name) {
 885                         dirname = *cache_name;
 886                         goto build;
 887                 }
 888         } else {
 889                 return NULL;
 890         }
 891         /*
 892          * the inode backref gives us the file name and the parent directory id.
 893          * From here we use __ino_resolve to get the path to the parent
 894          */
 895         dirname = __ino_resolve(fd, dirid);
 896 build:
 897         full = build_name(dirname, name);
 898         if (*cache_name && dirname != *cache_name)
 899                 free(*cache_name);
 900
 901         *cache_name = dirname;
 902         *cache_dirid = dirid;
 903         free(name);
 904
 905         return full;
 906 }
 907
 908 int btrfs_list_get_default_subvolume(int fd, u64 *default_id)
 909 {
 910         struct btrfs_ioctl_search_args args;
 911         struct btrfs_ioctl_search_key *sk = &args.key;
 912         struct btrfs_ioctl_search_header *sh;
 913         u64 found = 0;
 914         int ret;
 915
 916         memset(&args, 0, sizeof(args));
 917
 918         /*
 919          * search for a dir item with a name 'default' in the tree of
 920          * tree roots, it should point us to a default root
 921          */
 922         sk->tree_id = 1;
 923
 924         /* don't worry about ancient format and request only one item */
 925         sk->nr_items = 1;
 926
 927         sk->max_objectid = BTRFS_ROOT_TREE_DIR_OBJECTID;
 928         sk->min_objectid = BTRFS_ROOT_TREE_DIR_OBJECTID;
 929         sk->max_type = BTRFS_DIR_ITEM_KEY;
 930         sk->min_type = BTRFS_DIR_ITEM_KEY;
 931         sk->max_offset = (u64)-1;
 932         sk->max_transid = (u64)-1;
 933
 934         ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
 935         if (ret < 0)
 936                 return ret;
 937
 938         /* the ioctl returns the number of items it found in nr_items */
 939         if (sk->nr_items == 0)
 940                 goto out;
 941
 942         sh = (struct btrfs_ioctl_search_header *)args.buf;
 943
 944         if (sh->type == BTRFS_DIR_ITEM_KEY) {
 945                 struct btrfs_dir_item *di;
 946                 int name_len;
 947                 char *name;
 948
 949                 di = (struct btrfs_dir_item *)(sh + 1);
 950                 name_len = btrfs_stack_dir_name_len(di);
 951                 name = (char *)(di + 1);
 952
 953                 if (!strncmp("default", name, name_len))
 954                         found = btrfs_disk_key_objectid(&di->location);
 955         }
 956
 957 out:
 958         *default_id = found;
 959         return 0;
 960 }
 961
 962 static int __list_subvol_search(int fd, struct root_lookup *root_lookup)
 963 {
 964         int ret;
 965         struct btrfs_ioctl_search_args args;
 966         struct btrfs_ioctl_search_key *sk = &args.key;
 967         struct btrfs_ioctl_search_header sh;
 968         struct btrfs_root_ref *ref;
 969         struct btrfs_root_item *ri;
 970         unsigned long off = 0;
 971         int name_len;
 972         char *name;
 973         u64 dir_id;
 974         u64 gen = 0;
 975         u64 ogen;
 976         u64 flags;
 977         int i;
 978         time_t t;
 979         u8 uuid[BTRFS_UUID_SIZE];
 980         u8 puuid[BTRFS_UUID_SIZE];
 981
 982         root_lookup_init(root_lookup);
 983         memset(&args, 0, sizeof(args));
 984
 985         /* search in the tree of tree roots */
 986         sk->tree_id = 1;
 987
 988         /*
 989          * set the min and max to backref keys.  The search will
 990          * only send back this type of key now.
 991          */
 992         sk->max_type = BTRFS_ROOT_BACKREF_KEY;
 993         sk->min_type = BTRFS_ROOT_ITEM_KEY;
 994
 995         sk->min_objectid = BTRFS_FIRST_FREE_OBJECTID;
 996
 997         /*
 998          * set all the other params to the max, we'll take any objectid
 999          * and any trans
1000          */
1001         sk->max_objectid = BTRFS_LAST_FREE_OBJECTID;
1002         sk->max_offset = (u64)-1;
1003         sk->max_transid = (u64)-1;
1004
1005         /* just a big number, doesn't matter much */
1006         sk->nr_items = 4096;
1007
1008         while(1) {
1009                 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
1010                 if (ret < 0)
1011                         return ret;
1012                 /* the ioctl returns the number of item it found in nr_items */
1013                 if (sk->nr_items == 0)
1014                         break;
1015
1016                 off = 0;
1017
1018                 /*
1019                  * for each item, pull the key out of the header and then
1020                  * read the root_ref item it contains
1021                  */
1022                 for (i = 0; i < sk->nr_items; i++) {
1023                         memcpy(&sh, args.buf + off, sizeof(sh));
1024                         off += sizeof(sh);
1025                         if (sh.type == BTRFS_ROOT_BACKREF_KEY) {
1026                                 ref = (struct btrfs_root_ref *)(args.buf + off);
1027                                 name_len = btrfs_stack_root_ref_name_len(ref);
1028                                 name = (char *)(ref + 1);
1029                                 dir_id = btrfs_stack_root_ref_dirid(ref);
1030
1031                                 add_root(root_lookup, sh.objectid, sh.offset,
1032                                          0, 0, dir_id, name, name_len, 0, 0, 0,
1033                                          NULL, NULL);
1034                         } else if (sh.type == BTRFS_ROOT_ITEM_KEY) {
1035                                 ri = (struct btrfs_root_item *)(args.buf + off);
1036                                 gen = btrfs_root_generation(ri);
1037                                 flags = btrfs_root_flags(ri);
1038                                 if(sh.len >
1039                                    sizeof(struct btrfs_root_item_v0)) {
1040                                         t = ri->otime.sec;
1041                                         ogen = btrfs_root_otransid(ri);
1042                                         memcpy(uuid, ri->uuid, BTRFS_UUID_SIZE);
1043                                         memcpy(puuid, ri->parent_uuid, BTRFS_UUID_SIZE);
1044                                 } else {
1045                                         t = 0;
1046                                         ogen = 0;
1047                                         memset(uuid, 0, BTRFS_UUID_SIZE);
1048                                         memset(puuid, 0, BTRFS_UUID_SIZE);
1049                                 }
1050
1051                                 add_root(root_lookup, sh.objectid, 0,
1052                                          sh.offset, flags, 0, NULL, 0, ogen,
1053                                          gen, t, uuid, puuid);
1054                         }
1055
1056                         off += sh.len;
1057
1058                         /*
1059                          * record the mins in sk so we can make sure the
1060                          * next search doesn't repeat this root
1061                          */
1062                         sk->min_objectid = sh.objectid;
1063                         sk->min_type = sh.type;
1064                         sk->min_offset = sh.offset;
1065                 }
1066                 sk->nr_items = 4096;
1067                 sk->min_offset++;
1068                 if (!sk->min_offset)    /* overflow */
1069                         sk->min_type++;
1070                 else
1071                         continue;
1072
1073                 if (sk->min_type > BTRFS_ROOT_BACKREF_KEY) {
1074                         sk->min_type = BTRFS_ROOT_ITEM_KEY;
1075                         sk->min_objectid++;
1076                 } else
1077                         continue;
1078
1079                 if (sk->min_objectid > sk->max_objectid)
1080                         break;
1081         }
1082
1083         return 0;
1084 }
1085
1086 static int filter_by_rootid(struct root_info *ri, u64 data)
1087 {
1088         return ri->root_id == data;
1089 }
1090
1091 static int filter_snapshot(struct root_info *ri, u64 data)
1092 {
1093         return !!ri->root_offset;
1094 }
1095
1096 static int filter_flags(struct root_info *ri, u64 flags)
1097 {
1098         return ri->flags & flags;
1099 }
1100
1101 static int filter_gen_more(struct root_info *ri, u64 data)
1102 {
1103         return ri->gen >= data;
1104 }
1105
1106 static int filter_gen_less(struct root_info *ri, u64 data)
1107 {
1108         return ri->gen <= data;
1109 }
1110
1111 static int filter_gen_equal(struct root_info  *ri, u64 data)
1112 {
1113         return ri->gen == data;
1114 }
1115
1116 static int filter_cgen_more(struct root_info *ri, u64 data)
1117 {
1118         return ri->ogen >= data;
1119 }
1120
1121 static int filter_cgen_less(struct root_info *ri, u64 data)
1122 {
1123         return ri->ogen <= data;
1124 }
1125
1126 static int filter_cgen_equal(struct root_info *ri, u64 data)
1127 {
1128         return ri->ogen == data;
1129 }
1130
1131 static int filter_topid_equal(struct root_info *ri, u64 data)
1132 {
1133         return ri->top_id == data;
1134 }
1135
1136 static int filter_full_path(struct root_info *ri, u64 data)
1137 {
1138         if (ri->full_path && ri->top_id != data) {
1139                 char *tmp;
1140                 char p[] = "<FS_TREE>";
1141                 int add_len = strlen(p);
1142                 int len = strlen(ri->full_path);
1143
1144                 tmp = malloc(len + add_len + 2);
1145                 if (!tmp) {
1146                         fprintf(stderr, "memory allocation failed\n");
1147                         exit(1);
1148                 }
1149                 memcpy(tmp + add_len + 1, ri->full_path, len);
1150                 tmp[len + add_len + 1] = '\0';
1151                 tmp[add_len] = '/';
1152                 memcpy(tmp, p, add_len);
1153                 free(ri->full_path);
1154                 ri->full_path = tmp;
1155         }
1156         return 1;
1157 }
1158
1159 static int filter_by_parent(struct root_info *ri, u64 data)
1160 {
1161         return !uuid_compare(ri->puuid, (u8 *)data);
1162 }
1163
1164 static btrfs_list_filter_func all_filter_funcs[] = {
1165         [BTRFS_LIST_FILTER_ROOTID]              = filter_by_rootid,
1166         [BTRFS_LIST_FILTER_SNAPSHOT_ONLY]       = filter_snapshot,
1167         [BTRFS_LIST_FILTER_FLAGS]               = filter_flags,
1168         [BTRFS_LIST_FILTER_GEN_MORE]            = filter_gen_more,
1169         [BTRFS_LIST_FILTER_GEN_LESS]            = filter_gen_less,
1170         [BTRFS_LIST_FILTER_GEN_EQUAL]           = filter_gen_equal,
1171         [BTRFS_LIST_FILTER_CGEN_MORE]           = filter_cgen_more,
1172         [BTRFS_LIST_FILTER_CGEN_LESS]           = filter_cgen_less,
1173         [BTRFS_LIST_FILTER_CGEN_EQUAL]          = filter_cgen_equal,
1174         [BTRFS_LIST_FILTER_TOPID_EQUAL]         = filter_topid_equal,
1175         [BTRFS_LIST_FILTER_FULL_PATH]           = filter_full_path,
1176         [BTRFS_LIST_FILTER_BY_PARENT]           = filter_by_parent,
1177 };
1178
1179 struct btrfs_list_filter_set *btrfs_list_alloc_filter_set(void)
1180 {
1181         struct btrfs_list_filter_set *set;
1182         int size;
1183
1184         size = sizeof(struct btrfs_list_filter_set) +
1185                BTRFS_LIST_NFILTERS_INCREASE * sizeof(struct btrfs_list_filter);
1186         set = malloc(size);
1187         if (!set) {
1188                 fprintf(stderr, "memory allocation failed\n");
1189                 exit(1);
1190         }
1191
1192         memset(set, 0, size);
1193         set->total = BTRFS_LIST_NFILTERS_INCREASE;
1194
1195         return set;
1196 }
1197
1198 void btrfs_list_free_filter_set(struct btrfs_list_filter_set *filter_set)
1199 {
1200         free(filter_set);
1201 }
1202
1203 int btrfs_list_setup_filter(struct btrfs_list_filter_set **filter_set,
1204                             enum btrfs_list_filter_enum filter, u64 data)
1205 {
1206         struct btrfs_list_filter_set *set = *filter_set;
1207         int size;
1208
1209         BUG_ON(!set);
1210         BUG_ON(filter >= BTRFS_LIST_FILTER_MAX);
1211         BUG_ON(set->nfilters > set->total);
1212
1213         if (set->nfilters == set->total) {
1214                 size = set->total + BTRFS_LIST_NFILTERS_INCREASE;
1215                 size = sizeof(*set) + size * sizeof(struct btrfs_list_filter);
1216                 set = realloc(set, size);
1217                 if (!set) {
1218                         fprintf(stderr, "memory allocation failed\n");
1219                         exit(1);
1220                 }
1221
1222                 memset(&set->filters[set->total], 0,
1223                        BTRFS_LIST_NFILTERS_INCREASE *
1224                        sizeof(struct btrfs_list_filter));
1225                 set->total += BTRFS_LIST_NFILTERS_INCREASE;
1226                 *filter_set = set;
1227         }
1228
1229         BUG_ON(set->filters[set->nfilters].filter_func);
1230
1231         set->filters[set->nfilters].filter_func = all_filter_funcs[filter];
1232         set->filters[set->nfilters].data = data;
1233         set->nfilters++;
1234         return 0;
1235 }
1236
1237 static int filter_root(struct root_info *ri,
1238                        struct btrfs_list_filter_set *set)
1239 {
1240         int i, ret;
1241
1242         if (!set || !set->nfilters)
1243                 return 1;
1244
1245         for (i = 0; i < set->nfilters; i++) {
1246                 if (!set->filters[i].filter_func)
1247                         break;
1248                 ret = set->filters[i].filter_func(ri, set->filters[i].data);
1249                 if (!ret)
1250                         return 0;
1251         }
1252         return 1;
1253 }
1254
1255 static void __filter_and_sort_subvol(struct root_lookup *all_subvols,
1256                                     struct root_lookup *sort_tree,
1257                                     struct btrfs_list_filter_set *filter_set,
1258                                     struct btrfs_list_comparer_set *comp_set,
1259                                     u64 top_id)
1260 {
1261         struct rb_node *n;
1262         struct root_info *entry;
1263         int ret;
1264
1265         root_lookup_init(sort_tree);
1266
1267         n = rb_last(&all_subvols->root);
1268         while (n) {
1269                 entry = rb_entry(n, struct root_info, rb_node);
1270
1271                 resolve_root(all_subvols, entry, top_id);
1272                 ret = filter_root(entry, filter_set);
1273                 if (ret)
1274                         sort_tree_insert(sort_tree, entry, comp_set);
1275                 n = rb_prev(n);
1276         }
1277 }
1278
1279 static int __list_subvol_fill_paths(int fd, struct root_lookup *root_lookup)
1280 {
1281         struct rb_node *n;
1282
1283         n = rb_first(&root_lookup->root);
1284         while (n) {
1285                 struct root_info *entry;
1286                 int ret;
1287                 entry = rb_entry(n, struct root_info, rb_node);
1288                 ret = lookup_ino_path(fd, entry);
1289                 if(ret < 0)
1290                         return ret;
1291                 n = rb_next(n);
1292         }
1293
1294         return 0;
1295 }
1296
1297 static void print_subvolume_column(struct root_info *subv,
1298                                    enum btrfs_list_column_enum column)
1299 {
1300         char tstr[256];
1301         char uuidparse[37];
1302
1303         BUG_ON(column >= BTRFS_LIST_ALL || column < 0);
1304
1305         switch (column) {
1306         case BTRFS_LIST_OBJECTID:
1307                 printf("%llu", subv->root_id);
1308                 break;
1309         case BTRFS_LIST_GENERATION:
1310                 printf("%llu", subv->gen);
1311                 break;
1312         case BTRFS_LIST_OGENERATION:
1313                 printf("%llu", subv->ogen);
1314                 break;
1315         case BTRFS_LIST_PARENT:
1316                 printf("%llu", subv->ref_tree);
1317                 break;
1318         case BTRFS_LIST_TOP_LEVEL:
1319                 printf("%llu", subv->top_id);
1320                 break;
1321         case BTRFS_LIST_OTIME:
1322                 if (subv->otime)
1323                         strftime(tstr, 256, "%Y-%m-%d %X",
1324                                  localtime(&subv->otime));
1325                 else
1326                         strcpy(tstr, "-");
1327                 printf("%s", tstr);
1328                 break;
1329         case BTRFS_LIST_UUID:
1330                 if (uuid_is_null(subv->uuid))
1331                         strcpy(uuidparse, "-");
1332                 else
1333                         uuid_unparse(subv->uuid, uuidparse);
1334                 printf("%s", uuidparse);
1335                 break;
1336         case BTRFS_LIST_PUUID:
1337                 if (uuid_is_null(subv->puuid))
1338                         strcpy(uuidparse, "-");
1339                 else
1340                         uuid_unparse(subv->puuid, uuidparse);
1341                 printf("%s", uuidparse);
1342                 break;
1343         case BTRFS_LIST_PATH:
1344                 BUG_ON(!subv->full_path);
1345                 printf("%s", subv->full_path);
1346                 break;
1347         default:
1348                 break;
1349         }
1350 }
1351
1352 static void print_single_volume_info_raw(struct root_info *subv, char *raw_prefix)
1353 {
1354         int i;
1355
1356         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1357                 if (!btrfs_list_columns[i].need_print)
1358                         continue;
1359
1360                 if (raw_prefix)
1361                         printf("%s",raw_prefix);
1362
1363                 print_subvolume_column(subv, i);
1364         }
1365         printf("\n");
1366 }
1367
1368 static void print_single_volume_info_table(struct root_info *subv)
1369 {
1370         int i;
1371
1372         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1373                 if (!btrfs_list_columns[i].need_print)
1374                         continue;
1375
1376                 print_subvolume_column(subv, i);
1377
1378                 if (i != BTRFS_LIST_PATH)
1379                         printf("\t");
1380
1381                 if (i == BTRFS_LIST_TOP_LEVEL)
1382                         printf("\t");
1383         }
1384         printf("\n");
1385 }
1386
1387 static void print_single_volume_info_default(struct root_info *subv)
1388 {
1389         int i;
1390
1391         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1392                 if (!btrfs_list_columns[i].need_print)
1393                         continue;
1394
1395                 printf("%s ", btrfs_list_columns[i].name);
1396                 print_subvolume_column(subv, i);
1397
1398                 if (i != BTRFS_LIST_PATH)
1399                         printf(" ");
1400         }
1401         printf("\n");
1402 }
1403
1404 static void print_all_volume_info_tab_head()
1405 {
1406         int i;
1407         int len;
1408         char barrier[20];
1409
1410         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1411                 if (btrfs_list_columns[i].need_print)
1412                         printf("%s\t", btrfs_list_columns[i].name);
1413
1414                 if (i == BTRFS_LIST_ALL-1)
1415                         printf("\n");
1416         }
1417
1418         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1419                 memset(barrier, 0, sizeof(barrier));
1420
1421                 if (btrfs_list_columns[i].need_print) {
1422                         len = strlen(btrfs_list_columns[i].name);
1423                         while (len--)
1424                                 strcat(barrier, "-");
1425
1426                         printf("%s\t", barrier);
1427                 }
1428                 if (i == BTRFS_LIST_ALL-1)
1429                         printf("\n");
1430         }
1431 }
1432
1433 static void print_all_volume_info(struct root_lookup *sorted_tree,
1434                                   int layout, char *raw_prefix)
1435 {
1436         struct rb_node *n;
1437         struct root_info *entry;
1438
1439         if (layout == BTRFS_LIST_LAYOUT_TABLE)
1440                 print_all_volume_info_tab_head();
1441
1442         n = rb_first(&sorted_tree->root);
1443         while (n) {
1444                 entry = rb_entry(n, struct root_info, sort_node);
1445                 switch (layout) {
1446                 case BTRFS_LIST_LAYOUT_DEFAULT:
1447                         print_single_volume_info_default(entry);
1448                         break;
1449                 case BTRFS_LIST_LAYOUT_TABLE:
1450                         print_single_volume_info_table(entry);
1451                         break;
1452                 case BTRFS_LIST_LAYOUT_RAW:
1453                         print_single_volume_info_raw(entry, raw_prefix);
1454                         break;
1455                 }
1456                 n = rb_next(n);
1457         }
1458 }
1459
1460 int btrfs_list_subvols(int fd, struct root_lookup *root_lookup)
1461 {
1462         int ret;
1463
1464         ret = __list_subvol_search(fd, root_lookup);
1465         if (ret) {
1466                 fprintf(stderr, "ERROR: can't perform the search - %s\n",
1467                                 strerror(errno));
1468                 return ret;
1469         }
1470
1471         /*
1472          * now we have an rbtree full of root_info objects, but we need to fill
1473          * in their path names within the subvol that is referencing each one.
1474          */
1475         ret = __list_subvol_fill_paths(fd, root_lookup);
1476         return ret;
1477 }
1478
1479 int btrfs_list_subvols_print(int fd, struct btrfs_list_filter_set *filter_set,
1480                        struct btrfs_list_comparer_set *comp_set,
1481                        int layout, int full_path, char *raw_prefix)
1482 {
1483         struct root_lookup root_lookup;
1484         struct root_lookup root_sort;
1485         int ret;
1486         u64 top_id = (full_path ? 0 : btrfs_list_get_path_rootid(fd));
1487
1488         ret = btrfs_list_subvols(fd, &root_lookup);
1489         if (ret)
1490                 return ret;
1491         __filter_and_sort_subvol(&root_lookup, &root_sort, filter_set,
1492                                  comp_set, top_id);
1493
1494         print_all_volume_info(&root_sort, layout, raw_prefix);
1495         __free_all_subvolumn(&root_lookup);
1496
1497         return 0;
1498 }
1499
1500 int btrfs_get_subvol(int fd, struct root_info *the_ri)
1501 {
1502         int ret = -1;
1503         struct root_lookup rl;
1504         struct rb_node *rbn;
1505         struct root_info *ri;
1506         u64 root_id = btrfs_list_get_path_rootid(fd);
1507
1508         if (btrfs_list_subvols(fd, &rl))
1509                 return 1;
1510
1511         rbn = rb_first(&rl.root);
1512         while(rbn) {
1513                 ri = rb_entry(rbn, struct root_info, rb_node);
1514                 resolve_root(&rl, ri, root_id);
1515                 if (!comp_entry_with_rootid(the_ri, ri, 0)) {
1516                         memcpy(the_ri, ri, offsetof(struct root_info, path));
1517                         if (ri->path)
1518                                 the_ri->path = strdup(ri->path);
1519                         else
1520                                 the_ri->path = NULL;
1521                         if (ri->name)
1522                                 the_ri->name = strdup(ri->name);
1523                         else
1524                                 the_ri->name = NULL;
1525                         if (ri->full_path)
1526                                 the_ri->full_path = strdup(ri->full_path);
1527                         else
1528                                 the_ri->name = NULL;
1529                         ret = 0;
1530                         break;
1531                 }
1532                 rbn = rb_next(rbn);
1533         }
1534         __free_all_subvolumn(&rl);
1535         return ret;
1536 }
1537
1538 static int print_one_extent(int fd, struct btrfs_ioctl_search_header *sh,
1539                             struct btrfs_file_extent_item *item,
1540                             u64 found_gen, u64 *cache_dirid,
1541                             char **cache_dir_name, u64 *cache_ino,
1542                             char **cache_full_name)
1543 {
1544         u64 len = 0;
1545         u64 disk_start = 0;
1546         u64 disk_offset = 0;
1547         u8 type;
1548         int compressed = 0;
1549         int flags = 0;
1550         char *name = NULL;
1551
1552         if (sh->objectid == *cache_ino) {
1553                 name = *cache_full_name;
1554         } else if (*cache_full_name) {
1555                 free(*cache_full_name);
1556                 *cache_full_name = NULL;
1557         }
1558         if (!name) {
1559                 name = ino_resolve(fd, sh->objectid, cache_dirid,
1560                                    cache_dir_name);
1561                 *cache_full_name = name;
1562                 *cache_ino = sh->objectid;
1563         }
1564         if (!name)
1565                 return -EIO;
1566
1567         type = btrfs_stack_file_extent_type(item);
1568         compressed = btrfs_stack_file_extent_compression(item);
1569
1570         if (type == BTRFS_FILE_EXTENT_REG ||
1571             type == BTRFS_FILE_EXTENT_PREALLOC) {
1572                 disk_start = btrfs_stack_file_extent_disk_bytenr(item);
1573                 disk_offset = btrfs_stack_file_extent_offset(item);
1574                 len = btrfs_stack_file_extent_num_bytes(item);
1575         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1576                 disk_start = 0;
1577                 disk_offset = 0;
1578                 len = btrfs_stack_file_extent_ram_bytes(item);
1579         } else {
1580                 printf("unhandled extent type %d for inode %llu "
1581                        "file offset %llu gen %llu\n",
1582                         type,
1583                         (unsigned long long)sh->objectid,
1584                         (unsigned long long)sh->offset,
1585                         (unsigned long long)found_gen);
1586
1587                 return -EIO;
1588         }
1589         printf("inode %llu file offset %llu len %llu disk start %llu "
1590                "offset %llu gen %llu flags ",
1591                (unsigned long long)sh->objectid,
1592                (unsigned long long)sh->offset,
1593                (unsigned long long)len,
1594                (unsigned long long)disk_start,
1595                (unsigned long long)disk_offset,
1596                (unsigned long long)found_gen);
1597
1598         if (compressed) {
1599                 printf("COMPRESS");
1600                 flags++;
1601         }
1602         if (type == BTRFS_FILE_EXTENT_PREALLOC) {
1603                 printf("%sPREALLOC", flags ? "|" : "");
1604                 flags++;
1605         }
1606         if (type == BTRFS_FILE_EXTENT_INLINE) {
1607                 printf("%sINLINE", flags ? "|" : "");
1608                 flags++;
1609         }
1610         if (!flags)
1611                 printf("NONE");
1612
1613         printf(" %s\n", name);
1614         return 0;
1615 }
1616
1617 int btrfs_list_find_updated_files(int fd, u64 root_id, u64 oldest_gen)
1618 {
1619         int ret;
1620         struct btrfs_ioctl_search_args args;
1621         struct btrfs_ioctl_search_key *sk = &args.key;
1622         struct btrfs_ioctl_search_header sh;
1623         struct btrfs_file_extent_item *item;
1624         unsigned long off = 0;
1625         u64 found_gen;
1626         u64 max_found = 0;
1627         int i;
1628         int e;
1629         u64 cache_dirid = 0;
1630         u64 cache_ino = 0;
1631         char *cache_dir_name = NULL;
1632         char *cache_full_name = NULL;
1633         struct btrfs_file_extent_item backup;
1634
1635         memset(&backup, 0, sizeof(backup));
1636         memset(&args, 0, sizeof(args));
1637
1638         sk->tree_id = root_id;
1639
1640         /*
1641          * set all the other params to the max, we'll take any objectid
1642          * and any trans
1643          */
1644         sk->max_objectid = (u64)-1;
1645         sk->max_offset = (u64)-1;
1646         sk->max_transid = (u64)-1;
1647         sk->max_type = BTRFS_EXTENT_DATA_KEY;
1648         sk->min_transid = oldest_gen;
1649         /* just a big number, doesn't matter much */
1650         sk->nr_items = 4096;
1651
1652         max_found = find_root_gen(fd);
1653         while(1) {
1654                 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
1655                 e = errno;
1656                 if (ret < 0) {
1657                         fprintf(stderr, "ERROR: can't perform the search- %s\n",
1658                                 strerror(e));
1659                         return ret;
1660                 }
1661                 /* the ioctl returns the number of item it found in nr_items */
1662                 if (sk->nr_items == 0)
1663                         break;
1664
1665                 off = 0;
1666
1667                 /*
1668                  * for each item, pull the key out of the header and then
1669                  * read the root_ref item it contains
1670                  */
1671                 for (i = 0; i < sk->nr_items; i++) {
1672                         memcpy(&sh, args.buf + off, sizeof(sh));
1673                         off += sizeof(sh);
1674
1675                         /*
1676                          * just in case the item was too big, pass something other
1677                          * than garbage
1678                          */
1679                         if (sh.len == 0)
1680                                 item = &backup;
1681                         else
1682                                 item = (struct btrfs_file_extent_item *)(args.buf +
1683                                                                  off);
1684                         found_gen = btrfs_stack_file_extent_generation(item);
1685                         if (sh.type == BTRFS_EXTENT_DATA_KEY &&
1686                             found_gen >= oldest_gen) {
1687                                 print_one_extent(fd, &sh, item, found_gen,
1688                                                  &cache_dirid, &cache_dir_name,
1689                                                  &cache_ino, &cache_full_name);
1690                         }
1691                         off += sh.len;
1692
1693                         /*
1694                          * record the mins in sk so we can make sure the
1695                          * next search doesn't repeat this root
1696                          */
1697                         sk->min_objectid = sh.objectid;
1698                         sk->min_offset = sh.offset;
1699                         sk->min_type = sh.type;
1700                 }
1701                 sk->nr_items = 4096;
1702                 if (sk->min_offset < (u64)-1)
1703                         sk->min_offset++;
1704                 else if (sk->min_objectid < (u64)-1) {
1705                         sk->min_objectid++;
1706                         sk->min_offset = 0;
1707                         sk->min_type = 0;
1708                 } else
1709                         break;
1710         }
1711         free(cache_dir_name);
1712         free(cache_full_name);
1713         printf("transid marker was %llu\n", (unsigned long long)max_found);
1714         return ret;
1715 }
1716
1717 char *btrfs_list_path_for_root(int fd, u64 root)
1718 {
1719         struct root_lookup root_lookup;
1720         struct rb_node *n;
1721         char *ret_path = NULL;
1722         int ret;
1723         u64 top_id = btrfs_list_get_path_rootid(fd);
1724
1725         ret = __list_subvol_search(fd, &root_lookup);
1726         if (ret < 0)
1727                 return ERR_PTR(ret);
1728
1729         ret = __list_subvol_fill_paths(fd, &root_lookup);
1730         if (ret < 0)
1731                 return ERR_PTR(ret);
1732
1733         n = rb_last(&root_lookup.root);
1734         while (n) {
1735                 struct root_info *entry;
1736
1737                 entry = rb_entry(n, struct root_info, rb_node);
1738                 resolve_root(&root_lookup, entry, top_id);
1739                 if (entry->root_id == root) {
1740                         ret_path = entry->full_path;
1741                         entry->full_path = NULL;
1742                 }
1743
1744                 n = rb_prev(n);
1745         }
1746         __free_all_subvolumn(&root_lookup);
1747
1748         return ret_path;
1749 }
1750
1751 int btrfs_list_parse_sort_string(char *optarg,
1752                                  struct btrfs_list_comparer_set **comps)
1753 {
1754         int order;
1755         int flag;
1756         char *p;
1757         char **ptr_argv;
1758         int what_to_sort;
1759
1760         while ((p = strtok(optarg, ",")) != NULL) {
1761                 flag = 0;
1762                 ptr_argv = all_sort_items;
1763
1764                 while (*ptr_argv) {
1765                         if (strcmp(*ptr_argv, p) == 0) {
1766                                 flag = 1;
1767                                 break;
1768                         } else {
1769                                 p++;
1770                                 if (strcmp(*ptr_argv, p) == 0) {
1771                                         flag = 1;
1772                                         p--;
1773                                         break;
1774                                 }
1775                                 p--;
1776                         }
1777                         ptr_argv++;
1778                 }
1779
1780                 if (flag == 0)
1781                         return -1;
1782
1783                 else {
1784                         if (*p == '+') {
1785                                 order = 0;
1786                                 p++;
1787                         } else if (*p == '-') {
1788                                 order = 1;
1789                                 p++;
1790                         } else
1791                                 order = 0;
1792
1793                         what_to_sort = btrfs_list_get_sort_item(p);
1794                         btrfs_list_setup_comparer(comps, what_to_sort, order);
1795                 }
1796                 optarg = NULL;
1797         }
1798
1799         return 0;
1800 }
1801
1802 /*
1803  * This function is used to parse the argument of filter condition.
1804  *
1805  * type is the filter object.
1806  */
1807 int btrfs_list_parse_filter_string(char *optarg,
1808                                    struct btrfs_list_filter_set **filters,
1809                                    enum btrfs_list_filter_enum type)
1810 {
1811
1812         u64 arg;
1813         char *ptr_parse_end = NULL;
1814         char *ptr_optarg_end = optarg + strlen(optarg);
1815
1816         switch (*(optarg++)) {
1817         case '+':
1818                 arg = (u64)strtol(optarg, &ptr_parse_end, 10);
1819                 type += 2;
1820                 if (ptr_parse_end != ptr_optarg_end)
1821                         return -1;
1822
1823                 btrfs_list_setup_filter(filters, type, arg);
1824                 break;
1825         case '-':
1826                 arg = (u64)strtoll(optarg, &ptr_parse_end, 10);
1827                 type += 1;
1828                 if (ptr_parse_end != ptr_optarg_end)
1829                         return -1;
1830
1831                 btrfs_list_setup_filter(filters, type, arg);
1832                 break;
1833         default:
1834                 optarg--;
1835                 arg = (u64)strtoll(optarg, &ptr_parse_end, 10);
1836
1837                 if (ptr_parse_end != ptr_optarg_end)
1838                         return -1;
1839                 btrfs_list_setup_filter(filters, type, arg);
1840                 break;
1841         }
1842
1843         return 0;
1844 }
1845
1846 u64 btrfs_list_get_path_rootid(int fd)
1847 {
1848         int  ret;
1849         struct btrfs_ioctl_ino_lookup_args args;
1850
1851         memset(&args, 0, sizeof(args));
1852         args.objectid = BTRFS_FIRST_FREE_OBJECTID;
1853
1854         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
1855         if (ret < 0) {
1856                 fprintf(stderr,
1857                         "ERROR: can't perform the search -%s\n",
1858                         strerror(errno));
1859                 return ret;
1860         }
1861         return args.treeid;
1862 }