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 #include <sys/ioctl.h>
  21 #include <sys/mount.h>
  22 #include "ioctl.h"
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <fcntl.h>
  28 #include <unistd.h>
  29 #include <dirent.h>
  30 #include <libgen.h>
  31 #include "ctree.h"
  32 #include "transaction.h"
  33 #include "utils.h"
  34 #include <uuid/uuid.h>
  35 #include "btrfs-list.h"
  36
  37 #define BTRFS_LIST_NFILTERS_INCREASE    (2 * BTRFS_LIST_FILTER_MAX)
  38 #define BTRFS_LIST_NCOMPS_INCREASE      (2 * BTRFS_LIST_COMP_MAX)
  39
  40 /* we store all the roots we find in an rbtree so that we can
  41  * search for them later.
  42  */
  43 struct root_lookup {
  44         struct rb_root root;
  45 };
  46
  47 static struct {
  48         char    *name;
  49         char    *column_name;
  50         int     need_print;
  51 } btrfs_list_columns[] = {
  52         {
  53                 .name           = "ID",
  54                 .column_name    = "ID",
  55                 .need_print     = 0,
  56         },
  57         {
  58                 .name           = "gen",
  59                 .column_name    = "Gen",
  60                 .need_print     = 0,
  61         },
  62         {
  63                 .name           = "cgen",
  64                 .column_name    = "CGen",
  65                 .need_print     = 0,
  66         },
  67         {
  68                 .name           = "parent",
  69                 .column_name    = "Parent",
  70                 .need_print     = 0,
  71         },
  72         {
  73                 .name           = "top level",
  74                 .column_name    = "Top Level",
  75                 .need_print     = 0,
  76         },
  77         {
  78                 .name           = "otime",
  79                 .column_name    = "OTime",
  80                 .need_print     = 0,
  81         },
  82         {
  83                 .name           = "parent_uuid",
  84                 .column_name    = "Parent UUID",
  85                 .need_print     = 0,
  86         },
  87         {
  88                 .name           = "uuid",
  89                 .column_name    = "UUID",
  90                 .need_print     = 0,
  91         },
  92         {
  93                 .name           = "path",
  94                 .column_name    = "Path",
  95                 .need_print     = 0,
  96         },
  97         {
  98                 .name           = NULL,
  99                 .column_name    = NULL,
 100                 .need_print     = 0,
 101         },
 102 };
 103
 104 static btrfs_list_filter_func all_filter_funcs[];
 105 static btrfs_list_comp_func all_comp_funcs[];
 106
 107 void btrfs_list_setup_print_column(enum btrfs_list_column_enum column)
 108 {
 109         int i;
 110
 111         BUG_ON(column < 0 || column > BTRFS_LIST_ALL);
 112
 113         if (column < BTRFS_LIST_ALL) {
 114                 btrfs_list_columns[column].need_print = 1;
 115                 return;
 116         }
 117
 118         for (i = 0; i < BTRFS_LIST_ALL; i++)
 119                 btrfs_list_columns[i].need_print = 1;
 120 }
 121
 122 static void root_lookup_init(struct root_lookup *tree)
 123 {
 124         tree->root.rb_node = NULL;
 125 }
 126
 127 static int comp_entry_with_rootid(struct root_info *entry1,
 128                                   struct root_info *entry2,
 129                                   int is_descending)
 130 {
 131         int ret;
 132
 133         if (entry1->root_id > entry2->root_id)
 134                 ret = 1;
 135         else if (entry1->root_id < entry2->root_id)
 136                 ret = -1;
 137         else
 138                 ret = 0;
 139
 140         return is_descending ? -ret : ret;
 141 }
 142
 143 static int comp_entry_with_gen(struct root_info *entry1,
 144                                struct root_info *entry2,
 145                                int is_descending)
 146 {
 147         int ret;
 148
 149         if (entry1->gen > entry2->gen)
 150                 ret = 1;
 151         else if (entry1->gen < entry2->gen)
 152                 ret = -1;
 153         else
 154                 ret = 0;
 155
 156         return is_descending ? -ret : ret;
 157 }
 158
 159 static int comp_entry_with_ogen(struct root_info *entry1,
 160                                 struct root_info *entry2,
 161                                 int is_descending)
 162 {
 163         int ret;
 164
 165         if (entry1->ogen > entry2->ogen)
 166                 ret = 1;
 167         else if (entry1->ogen < entry2->ogen)
 168                 ret = -1;
 169         else
 170                 ret = 0;
 171
 172         return is_descending ? -ret : ret;
 173 }
 174
 175 static int comp_entry_with_path(struct root_info *entry1,
 176                                 struct root_info *entry2,
 177                                 int is_descending)
 178 {
 179         int ret;
 180
 181         if (strcmp(entry1->full_path, entry2->full_path) > 0)
 182                 ret = 1;
 183         else if (strcmp(entry1->full_path, entry2->full_path) < 0)
 184                 ret = -1;
 185         else
 186                 ret = 0;
 187
 188         return is_descending ? -ret : ret;
 189 }
 190
 191 static btrfs_list_comp_func all_comp_funcs[] = {
 192         [BTRFS_LIST_COMP_ROOTID]        = comp_entry_with_rootid,
 193         [BTRFS_LIST_COMP_OGEN]          = comp_entry_with_ogen,
 194         [BTRFS_LIST_COMP_GEN]           = comp_entry_with_gen,
 195         [BTRFS_LIST_COMP_PATH]          = comp_entry_with_path,
 196 };
 197
 198 static char *all_sort_items[] = {
 199         [BTRFS_LIST_COMP_ROOTID]        = "rootid",
 200         [BTRFS_LIST_COMP_OGEN]          = "ogen",
 201         [BTRFS_LIST_COMP_GEN]           = "gen",
 202         [BTRFS_LIST_COMP_PATH]          = "path",
 203         [BTRFS_LIST_COMP_MAX]           = NULL,
 204 };
 205
 206 static int  btrfs_list_get_sort_item(char *sort_name)
 207 {
 208         int i;
 209
 210         for (i = 0; i < BTRFS_LIST_COMP_MAX; i++) {
 211                 if (strcmp(sort_name, all_sort_items[i]) == 0)
 212                         return i;
 213         }
 214         return -1;
 215 }
 216
 217 struct btrfs_list_comparer_set *btrfs_list_alloc_comparer_set(void)
 218 {
 219         struct btrfs_list_comparer_set *set;
 220         int size;
 221
 222         size = sizeof(struct btrfs_list_comparer_set) +
 223                BTRFS_LIST_NCOMPS_INCREASE * sizeof(struct btrfs_list_comparer);
 224         set = malloc(size);
 225         if (!set) {
 226                 fprintf(stderr, "memory allocation failed\n");
 227                 exit(1);
 228         }
 229
 230         memset(set, 0, size);
 231         set->total = BTRFS_LIST_NCOMPS_INCREASE;
 232
 233         return set;
 234 }
 235
 236 void btrfs_list_free_comparer_set(struct btrfs_list_comparer_set *comp_set)
 237 {
 238         free(comp_set);
 239 }
 240
 241 static int btrfs_list_setup_comparer(struct btrfs_list_comparer_set **comp_set,
 242                 enum btrfs_list_comp_enum comparer, int is_descending)
 243 {
 244         struct btrfs_list_comparer_set *set = *comp_set;
 245         int size;
 246
 247         BUG_ON(!set);
 248         BUG_ON(comparer >= BTRFS_LIST_COMP_MAX);
 249         BUG_ON(set->ncomps > set->total);
 250
 251         if (set->ncomps == set->total) {
 252                 size = set->total + BTRFS_LIST_NCOMPS_INCREASE;
 253                 size = sizeof(*set) + size * sizeof(struct btrfs_list_comparer);
 254                 set = realloc(set, size);
 255                 if (!set) {
 256                         fprintf(stderr, "memory allocation failed\n");
 257                         exit(1);
 258                 }
 259
 260                 memset(&set->comps[set->total], 0,
 261                        BTRFS_LIST_NCOMPS_INCREASE *
 262                        sizeof(struct btrfs_list_comparer));
 263                 set->total += BTRFS_LIST_NCOMPS_INCREASE;
 264                 *comp_set = set;
 265         }
 266
 267         BUG_ON(set->comps[set->ncomps].comp_func);
 268
 269         set->comps[set->ncomps].comp_func = all_comp_funcs[comparer];
 270         set->comps[set->ncomps].is_descending = is_descending;
 271         set->ncomps++;
 272         return 0;
 273 }
 274
 275 static int sort_comp(struct root_info *entry1, struct root_info *entry2,
 276                      struct btrfs_list_comparer_set *set)
 277 {
 278         int rootid_compared = 0;
 279         int i, ret = 0;
 280
 281         if (!set || !set->ncomps)
 282                 goto comp_rootid;
 283
 284         for (i = 0; i < set->ncomps; i++) {
 285                 if (!set->comps[i].comp_func)
 286                         break;
 287
 288                 ret = set->comps[i].comp_func(entry1, entry2,
 289                                               set->comps[i].is_descending);
 290                 if (ret)
 291                         return ret;
 292
 293                 if (set->comps[i].comp_func == comp_entry_with_rootid)
 294                         rootid_compared = 1;
 295         }
 296
 297         if (!rootid_compared) {
 298 comp_rootid:
 299                 ret = comp_entry_with_rootid(entry1, entry2, 0);
 300         }
 301
 302         return ret;
 303 }
 304
 305 static int sort_tree_insert(struct root_lookup *sort_tree,
 306                             struct root_info *ins,
 307                             struct btrfs_list_comparer_set *comp_set)
 308 {
 309         struct rb_node **p = &sort_tree->root.rb_node;
 310         struct rb_node *parent = NULL;
 311         struct root_info *curr;
 312         int ret;
 313
 314         while (*p) {
 315                 parent = *p;
 316                 curr = rb_entry(parent, struct root_info, sort_node);
 317
 318                 ret = sort_comp(ins, curr, comp_set);
 319                 if (ret < 0)
 320                         p = &(*p)->rb_left;
 321                 else if (ret > 0)
 322                         p = &(*p)->rb_right;
 323                 else
 324                         return -EEXIST;
 325         }
 326
 327         rb_link_node(&ins->sort_node, parent, p);
 328         rb_insert_color(&ins->sort_node, &sort_tree->root);
 329         return 0;
 330 }
 331
 332 /*
 333  * insert a new root into the tree.  returns the existing root entry
 334  * if one is already there.  Both root_id and ref_tree are used
 335  * as the key
 336  */
 337 static int root_tree_insert(struct root_lookup *root_tree,
 338                             struct root_info *ins)
 339 {
 340         struct rb_node **p = &root_tree->root.rb_node;
 341         struct rb_node * parent = NULL;
 342         struct root_info *curr;
 343         int ret;
 344
 345         while(*p) {
 346                 parent = *p;
 347                 curr = rb_entry(parent, struct root_info, rb_node);
 348
 349                 ret = comp_entry_with_rootid(ins, curr, 0);
 350                 if (ret < 0)
 351                         p = &(*p)->rb_left;
 352                 else if (ret > 0)
 353                         p = &(*p)->rb_right;
 354                 else
 355                         return -EEXIST;
 356         }
 357
 358         rb_link_node(&ins->rb_node, parent, p);
 359         rb_insert_color(&ins->rb_node, &root_tree->root);
 360         return 0;
 361 }
 362
 363 /*
 364  * find a given root id in the tree.  We return the smallest one,
 365  * rb_next can be used to move forward looking for more if required
 366  */
 367 static struct root_info *root_tree_search(struct root_lookup *root_tree,
 368                                           u64 root_id)
 369 {
 370         struct rb_node *n = root_tree->root.rb_node;
 371         struct root_info *entry;
 372         struct root_info tmp;
 373         int ret;
 374
 375         tmp.root_id = root_id;
 376
 377         while(n) {
 378                 entry = rb_entry(n, struct root_info, rb_node);
 379
 380                 ret = comp_entry_with_rootid(&tmp, entry, 0);
 381                 if (ret < 0)
 382                         n = n->rb_left;
 383                 else if (ret > 0)
 384                         n = n->rb_right;
 385                 else
 386                         return entry;
 387         }
 388         return NULL;
 389 }
 390
 391 static int update_root(struct root_lookup *root_lookup,
 392                        u64 root_id, u64 ref_tree, u64 root_offset, u64 flags,
 393                        u64 dir_id, char *name, int name_len, u64 ogen, u64 gen,
 394                        time_t ot, void *uuid, void *puuid)
 395 {
 396         struct root_info *ri;
 397
 398         ri = root_tree_search(root_lookup, root_id);
 399         if (!ri || ri->root_id != root_id)
 400                 return -ENOENT;
 401         if (name && name_len > 0) {
 402                 free(ri->name);
 403
 404                 ri->name = malloc(name_len + 1);
 405                 if (!ri->name) {
 406                         fprintf(stderr, "memory allocation failed\n");
 407                         exit(1);
 408                 }
 409                 strncpy(ri->name, name, name_len);
 410                 ri->name[name_len] = 0;
 411         }
 412         if (ref_tree)
 413                 ri->ref_tree = ref_tree;
 414         if (root_offset)
 415                 ri->root_offset = root_offset;
 416         if (flags)
 417                 ri->flags = flags;
 418         if (dir_id)
 419                 ri->dir_id = dir_id;
 420         if (gen)
 421                 ri->gen = gen;
 422         if (ogen)
 423                 ri->ogen = ogen;
 424         if (!ri->ogen && root_offset)
 425                 ri->ogen = root_offset;
 426         if (ot)
 427                 ri->otime = ot;
 428         if (uuid)
 429                 memcpy(&ri->uuid, uuid, BTRFS_UUID_SIZE);
 430         if (puuid)
 431                 memcpy(&ri->puuid, puuid, BTRFS_UUID_SIZE);
 432
 433         return 0;
 434 }
 435
 436 /*
 437  * add_root - update the existed root, or allocate a new root and insert it
 438  *            into the lookup tree.
 439  * root_id: object id of the root
 440  * ref_tree: object id of the referring root.
 441  * root_offset: offset value of the root'key
 442  * dir_id: inode id of the directory in ref_tree where this root can be found.
 443  * name: the name of root_id in that directory
 444  * name_len: the length of name
 445  * ogen: the original generation of the root
 446  * gen: the current generation of the root
 447  * ot: the original time(create time) of the root
 448  * uuid: uuid of the root
 449  * puuid: uuid of the root parent if any
 450  */
 451 static int add_root(struct root_lookup *root_lookup,
 452                     u64 root_id, u64 ref_tree, u64 root_offset, u64 flags,
 453                     u64 dir_id, char *name, int name_len, u64 ogen, u64 gen,
 454                     time_t ot, void *uuid, void *puuid)
 455 {
 456         struct root_info *ri;
 457         int ret;
 458
 459         ret = update_root(root_lookup, root_id, ref_tree, root_offset, flags,
 460                           dir_id, name, name_len, ogen, gen, ot, uuid, puuid);
 461         if (!ret)
 462                 return 0;
 463
 464         ri = malloc(sizeof(*ri));
 465         if (!ri) {
 466                 printf("memory allocation failed\n");
 467                 exit(1);
 468         }
 469         memset(ri, 0, sizeof(*ri));
 470         ri->root_id = root_id;
 471
 472         if (name && name_len > 0) {
 473                 ri->name = malloc(name_len + 1);
 474                 if (!ri->name) {
 475                         fprintf(stderr, "memory allocation failed\n");
 476                         exit(1);
 477                 }
 478                 strncpy(ri->name, name, name_len);
 479                 ri->name[name_len] = 0;
 480         }
 481         if (ref_tree)
 482                 ri->ref_tree = ref_tree;
 483         if (dir_id)
 484                 ri->dir_id = dir_id;
 485         if (root_offset)
 486                 ri->root_offset = root_offset;
 487         if (flags)
 488                 ri->flags = flags;
 489         if (gen)
 490                 ri->gen = gen;
 491         if (ogen)
 492                 ri->ogen = ogen;
 493         if (!ri->ogen && root_offset)
 494                 ri->ogen = root_offset;
 495         if (ot)
 496                 ri->otime = ot;
 497
 498         if (uuid)
 499                 memcpy(&ri->uuid, uuid, BTRFS_UUID_SIZE);
 500
 501         if (puuid)
 502                 memcpy(&ri->puuid, puuid, BTRFS_UUID_SIZE);
 503
 504         ret = root_tree_insert(root_lookup, ri);
 505         if (ret) {
 506                 printf("failed to insert tree %llu\n", (unsigned long long)root_id);
 507                 exit(1);
 508         }
 509         return 0;
 510 }
 511
 512 static void __free_root_info(struct rb_node *node)
 513 {
 514         struct root_info *ri;
 515
 516         ri = rb_entry(node, struct root_info, rb_node);
 517         free(ri->name);
 518         free(ri->path);
 519         free(ri->full_path);
 520         free(ri);
 521 }
 522
 523 static inline void __free_all_subvolumn(struct root_lookup *root_tree)
 524 {
 525         rb_free_nodes(&root_tree->root, __free_root_info);
 526 }
 527
 528 /*
 529  * for a given root_info, search through the root_lookup tree to construct
 530  * the full path name to it.
 531  *
 532  * This can't be called until all the root_info->path fields are filled
 533  * in by lookup_ino_path
 534  */
 535 static int resolve_root(struct root_lookup *rl, struct root_info *ri,
 536                        u64 top_id)
 537 {
 538         char *full_path = NULL;
 539         int len = 0;
 540         struct root_info *found;
 541
 542         /*
 543          * we go backwards from the root_info object and add pathnames
 544          * from parent directories as we go.
 545          */
 546         found = ri;
 547         while (1) {
 548                 char *tmp;
 549                 u64 next;
 550                 int add_len;
 551
 552                 /*
 553                  * ref_tree = 0 indicates the subvolumes
 554                  * has been deleted.
 555                  */
 556                 if (!found->ref_tree) {
 557                         free(full_path);
 558                         return -ENOENT;
 559                 }
 560
 561                 add_len = strlen(found->path);
 562
 563                 if (full_path) {
 564                         /* room for / and for null */
 565                         tmp = malloc(add_len + 2 + len);
 566                         if (!tmp) {
 567                                 perror("malloc failed");
 568                                 exit(1);
 569                         }
 570                         memcpy(tmp + add_len + 1, full_path, len);
 571                         tmp[add_len] = '/';
 572                         memcpy(tmp, found->path, add_len);
 573                         tmp [add_len + len + 1] = '\0';
 574                         free(full_path);
 575                         full_path = tmp;
 576                         len += add_len + 1;
 577                 } else {
 578                         full_path = strdup(found->path);
 579                         len = add_len;
 580                 }
 581                 if (!ri->top_id)
 582                         ri->top_id = found->ref_tree;
 583
 584                 next = found->ref_tree;
 585                 if (next == top_id)
 586                         break;
 587                 /*
 588                 * if the ref_tree = BTRFS_FS_TREE_OBJECTID,
 589                 * we are at the top
 590                 */
 591                 if (next == BTRFS_FS_TREE_OBJECTID)
 592                         break;
 593                 /*
 594                 * if the ref_tree wasn't in our tree of roots, the
 595                 * subvolume was deleted.
 596                 */
 597                 found = root_tree_search(rl, next);
 598                 if (!found) {
 599                         free(full_path);
 600                         return -ENOENT;
 601                 }
 602         }
 603
 604         ri->full_path = full_path;
 605
 606         return 0;
 607 }
 608
 609 /*
 610  * for a single root_info, ask the kernel to give us a path name
 611  * inside it's ref_root for the dir_id where it lives.
 612  *
 613  * This fills in root_info->path with the path to the directory and and
 614  * appends this root's name.
 615  */
 616 static int lookup_ino_path(int fd, struct root_info *ri)
 617 {
 618         struct btrfs_ioctl_ino_lookup_args args;
 619         int ret, e;
 620
 621         if (ri->path)
 622                 return 0;
 623
 624         if (!ri->ref_tree)
 625                 return -ENOENT;
 626
 627         memset(&args, 0, sizeof(args));
 628         args.treeid = ri->ref_tree;
 629         args.objectid = ri->dir_id;
 630
 631         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
 632         e = errno;
 633         if (ret) {
 634                 if (e == ENOENT) {
 635                         ri->ref_tree = 0;
 636                         return -ENOENT;
 637                 }
 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 != ino_args.treeid)
 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 static 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 = btrfs_stack_timespec_sec(&ri->otime);
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 *)(unsigned long)data);
1162 }
1163
1164 static int filter_deleted(struct root_info *ri, u64 data)
1165 {
1166         return ri->deleted;
1167 }
1168
1169 static btrfs_list_filter_func all_filter_funcs[] = {
1170         [BTRFS_LIST_FILTER_ROOTID]              = filter_by_rootid,
1171         [BTRFS_LIST_FILTER_SNAPSHOT_ONLY]       = filter_snapshot,
1172         [BTRFS_LIST_FILTER_FLAGS]               = filter_flags,
1173         [BTRFS_LIST_FILTER_GEN_MORE]            = filter_gen_more,
1174         [BTRFS_LIST_FILTER_GEN_LESS]            = filter_gen_less,
1175         [BTRFS_LIST_FILTER_GEN_EQUAL]           = filter_gen_equal,
1176         [BTRFS_LIST_FILTER_CGEN_MORE]           = filter_cgen_more,
1177         [BTRFS_LIST_FILTER_CGEN_LESS]           = filter_cgen_less,
1178         [BTRFS_LIST_FILTER_CGEN_EQUAL]          = filter_cgen_equal,
1179         [BTRFS_LIST_FILTER_TOPID_EQUAL]         = filter_topid_equal,
1180         [BTRFS_LIST_FILTER_FULL_PATH]           = filter_full_path,
1181         [BTRFS_LIST_FILTER_BY_PARENT]           = filter_by_parent,
1182         [BTRFS_LIST_FILTER_DELETED]             = filter_deleted,
1183 };
1184
1185 struct btrfs_list_filter_set *btrfs_list_alloc_filter_set(void)
1186 {
1187         struct btrfs_list_filter_set *set;
1188         int size;
1189
1190         size = sizeof(struct btrfs_list_filter_set) +
1191                BTRFS_LIST_NFILTERS_INCREASE * sizeof(struct btrfs_list_filter);
1192         set = malloc(size);
1193         if (!set) {
1194                 fprintf(stderr, "memory allocation failed\n");
1195                 exit(1);
1196         }
1197
1198         memset(set, 0, size);
1199         set->total = BTRFS_LIST_NFILTERS_INCREASE;
1200
1201         return set;
1202 }
1203
1204 void btrfs_list_free_filter_set(struct btrfs_list_filter_set *filter_set)
1205 {
1206         free(filter_set);
1207 }
1208
1209 int btrfs_list_setup_filter(struct btrfs_list_filter_set **filter_set,
1210                             enum btrfs_list_filter_enum filter, u64 data)
1211 {
1212         struct btrfs_list_filter_set *set = *filter_set;
1213         int size;
1214
1215         BUG_ON(!set);
1216         BUG_ON(filter >= BTRFS_LIST_FILTER_MAX);
1217         BUG_ON(set->nfilters > set->total);
1218
1219         if (filter == BTRFS_LIST_FILTER_DELETED) {
1220                 set->only_deleted = 1;
1221                 return 0;
1222         }
1223
1224         if (set->nfilters == set->total) {
1225                 size = set->total + BTRFS_LIST_NFILTERS_INCREASE;
1226                 size = sizeof(*set) + size * sizeof(struct btrfs_list_filter);
1227                 set = realloc(set, size);
1228                 if (!set) {
1229                         fprintf(stderr, "memory allocation failed\n");
1230                         exit(1);
1231                 }
1232
1233                 memset(&set->filters[set->total], 0,
1234                        BTRFS_LIST_NFILTERS_INCREASE *
1235                        sizeof(struct btrfs_list_filter));
1236                 set->total += BTRFS_LIST_NFILTERS_INCREASE;
1237                 *filter_set = set;
1238         }
1239
1240         BUG_ON(set->filters[set->nfilters].filter_func);
1241
1242         set->filters[set->nfilters].filter_func = all_filter_funcs[filter];
1243         set->filters[set->nfilters].data = data;
1244         set->nfilters++;
1245         return 0;
1246 }
1247
1248 static int filter_root(struct root_info *ri,
1249                        struct btrfs_list_filter_set *set)
1250 {
1251         int i, ret;
1252
1253         if (!set || !set->nfilters)
1254                 return 1;
1255
1256         if (set->only_deleted && !ri->deleted)
1257                 return 0;
1258
1259         if (!set->only_deleted && ri->deleted)
1260                 return 0;
1261
1262         for (i = 0; i < set->nfilters; i++) {
1263                 if (!set->filters[i].filter_func)
1264                         break;
1265                 ret = set->filters[i].filter_func(ri, set->filters[i].data);
1266                 if (!ret)
1267                         return 0;
1268         }
1269         return 1;
1270 }
1271
1272 static void __filter_and_sort_subvol(struct root_lookup *all_subvols,
1273                                     struct root_lookup *sort_tree,
1274                                     struct btrfs_list_filter_set *filter_set,
1275                                     struct btrfs_list_comparer_set *comp_set,
1276                                     u64 top_id)
1277 {
1278         struct rb_node *n;
1279         struct root_info *entry;
1280         int ret;
1281
1282         root_lookup_init(sort_tree);
1283
1284         n = rb_last(&all_subvols->root);
1285         while (n) {
1286                 entry = rb_entry(n, struct root_info, rb_node);
1287
1288                 ret = resolve_root(all_subvols, entry, top_id);
1289                 if (ret == -ENOENT) {
1290                         entry->full_path = strdup("DELETED");
1291                         entry->deleted = 1;
1292                 }
1293                 ret = filter_root(entry, filter_set);
1294                 if (ret)
1295                         sort_tree_insert(sort_tree, entry, comp_set);
1296                 n = rb_prev(n);
1297         }
1298 }
1299
1300 static int __list_subvol_fill_paths(int fd, struct root_lookup *root_lookup)
1301 {
1302         struct rb_node *n;
1303
1304         n = rb_first(&root_lookup->root);
1305         while (n) {
1306                 struct root_info *entry;
1307                 int ret;
1308                 entry = rb_entry(n, struct root_info, rb_node);
1309                 ret = lookup_ino_path(fd, entry);
1310                 if (ret && ret != -ENOENT)
1311                         return ret;
1312                 n = rb_next(n);
1313         }
1314
1315         return 0;
1316 }
1317
1318 static void print_subvolume_column(struct root_info *subv,
1319                                    enum btrfs_list_column_enum column)
1320 {
1321         char tstr[256];
1322         char uuidparse[BTRFS_UUID_UNPARSED_SIZE];
1323
1324         BUG_ON(column >= BTRFS_LIST_ALL || column < 0);
1325
1326         switch (column) {
1327         case BTRFS_LIST_OBJECTID:
1328                 printf("%llu", subv->root_id);
1329                 break;
1330         case BTRFS_LIST_GENERATION:
1331                 printf("%llu", subv->gen);
1332                 break;
1333         case BTRFS_LIST_OGENERATION:
1334                 printf("%llu", subv->ogen);
1335                 break;
1336         case BTRFS_LIST_PARENT:
1337                 printf("%llu", subv->ref_tree);
1338                 break;
1339         case BTRFS_LIST_TOP_LEVEL:
1340                 printf("%llu", subv->top_id);
1341                 break;
1342         case BTRFS_LIST_OTIME:
1343                 if (subv->otime) {
1344                         struct tm tm;
1345
1346                         localtime_r(&subv->otime, &tm);
1347                         strftime(tstr, 256, "%Y-%m-%d %X", &tm);
1348                 } else
1349                         strcpy(tstr, "-");
1350                 printf("%s", tstr);
1351                 break;
1352         case BTRFS_LIST_UUID:
1353                 if (uuid_is_null(subv->uuid))
1354                         strcpy(uuidparse, "-");
1355                 else
1356                         uuid_unparse(subv->uuid, uuidparse);
1357                 printf("%s", uuidparse);
1358                 break;
1359         case BTRFS_LIST_PUUID:
1360                 if (uuid_is_null(subv->puuid))
1361                         strcpy(uuidparse, "-");
1362                 else
1363                         uuid_unparse(subv->puuid, uuidparse);
1364                 printf("%s", uuidparse);
1365                 break;
1366         case BTRFS_LIST_PATH:
1367                 BUG_ON(!subv->full_path);
1368                 printf("%s", subv->full_path);
1369                 break;
1370         default:
1371                 break;
1372         }
1373 }
1374
1375 static void print_single_volume_info_raw(struct root_info *subv, char *raw_prefix)
1376 {
1377         int i;
1378
1379         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1380                 if (!btrfs_list_columns[i].need_print)
1381                         continue;
1382
1383                 if (raw_prefix)
1384                         printf("%s",raw_prefix);
1385
1386                 print_subvolume_column(subv, i);
1387         }
1388         printf("\n");
1389 }
1390
1391 static void print_single_volume_info_table(struct root_info *subv)
1392 {
1393         int i;
1394
1395         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1396                 if (!btrfs_list_columns[i].need_print)
1397                         continue;
1398
1399                 print_subvolume_column(subv, i);
1400
1401                 if (i != BTRFS_LIST_PATH)
1402                         printf("\t");
1403
1404                 if (i == BTRFS_LIST_TOP_LEVEL)
1405                         printf("\t");
1406         }
1407         printf("\n");
1408 }
1409
1410 static void print_single_volume_info_default(struct root_info *subv)
1411 {
1412         int i;
1413
1414         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1415                 if (!btrfs_list_columns[i].need_print)
1416                         continue;
1417
1418                 printf("%s ", btrfs_list_columns[i].name);
1419                 print_subvolume_column(subv, i);
1420
1421                 if (i != BTRFS_LIST_PATH)
1422                         printf(" ");
1423         }
1424         printf("\n");
1425 }
1426
1427 static void print_all_volume_info_tab_head(void)
1428 {
1429         int i;
1430         int len;
1431         char barrier[20];
1432
1433         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1434                 if (btrfs_list_columns[i].need_print)
1435                         printf("%s\t", btrfs_list_columns[i].name);
1436
1437                 if (i == BTRFS_LIST_ALL-1)
1438                         printf("\n");
1439         }
1440
1441         for (i = 0; i < BTRFS_LIST_ALL; i++) {
1442                 memset(barrier, 0, sizeof(barrier));
1443
1444                 if (btrfs_list_columns[i].need_print) {
1445                         len = strlen(btrfs_list_columns[i].name);
1446                         while (len--)
1447                                 strcat(barrier, "-");
1448
1449                         printf("%s\t", barrier);
1450                 }
1451                 if (i == BTRFS_LIST_ALL-1)
1452                         printf("\n");
1453         }
1454 }
1455
1456 static void print_all_volume_info(struct root_lookup *sorted_tree,
1457                                   int layout, char *raw_prefix)
1458 {
1459         struct rb_node *n;
1460         struct root_info *entry;
1461
1462         if (layout == BTRFS_LIST_LAYOUT_TABLE)
1463                 print_all_volume_info_tab_head();
1464
1465         n = rb_first(&sorted_tree->root);
1466         while (n) {
1467                 entry = rb_entry(n, struct root_info, sort_node);
1468                 switch (layout) {
1469                 case BTRFS_LIST_LAYOUT_DEFAULT:
1470                         print_single_volume_info_default(entry);
1471                         break;
1472                 case BTRFS_LIST_LAYOUT_TABLE:
1473                         print_single_volume_info_table(entry);
1474                         break;
1475                 case BTRFS_LIST_LAYOUT_RAW:
1476                         print_single_volume_info_raw(entry, raw_prefix);
1477                         break;
1478                 }
1479                 n = rb_next(n);
1480         }
1481 }
1482
1483 static int btrfs_list_subvols(int fd, struct root_lookup *root_lookup)
1484 {
1485         int ret;
1486
1487         ret = __list_subvol_search(fd, root_lookup);
1488         if (ret) {
1489                 fprintf(stderr, "ERROR: can't perform the search - %s\n",
1490                                 strerror(errno));
1491                 return ret;
1492         }
1493
1494         /*
1495          * now we have an rbtree full of root_info objects, but we need to fill
1496          * in their path names within the subvol that is referencing each one.
1497          */
1498         ret = __list_subvol_fill_paths(fd, root_lookup);
1499         return ret;
1500 }
1501
1502 int btrfs_list_subvols_print(int fd, struct btrfs_list_filter_set *filter_set,
1503                        struct btrfs_list_comparer_set *comp_set,
1504                        int layout, int full_path, char *raw_prefix)
1505 {
1506         struct root_lookup root_lookup;
1507         struct root_lookup root_sort;
1508         int ret = 0;
1509         u64 top_id = 0;
1510
1511         if (full_path)
1512                 ret = btrfs_list_get_path_rootid(fd, &top_id);
1513         if (ret)
1514                 return ret;
1515
1516         ret = btrfs_list_subvols(fd, &root_lookup);
1517         if (ret)
1518                 return ret;
1519         __filter_and_sort_subvol(&root_lookup, &root_sort, filter_set,
1520                                  comp_set, top_id);
1521
1522         print_all_volume_info(&root_sort, layout, raw_prefix);
1523         __free_all_subvolumn(&root_lookup);
1524
1525         return 0;
1526 }
1527
1528 static char *strdup_or_null(const char *s)
1529 {
1530         if (!s)
1531                 return NULL;
1532         return strdup(s);
1533 }
1534
1535 int btrfs_get_subvol(int fd, struct root_info *the_ri)
1536 {
1537         int ret, rr;
1538         struct root_lookup rl;
1539         struct rb_node *rbn;
1540         struct root_info *ri;
1541         u64 root_id;
1542
1543         ret = btrfs_list_get_path_rootid(fd, &root_id);
1544         if (ret)
1545                 return ret;
1546
1547         ret = btrfs_list_subvols(fd, &rl);
1548         if (ret)
1549                 return ret;
1550
1551         rbn = rb_first(&rl.root);
1552         while(rbn) {
1553                 ri = rb_entry(rbn, struct root_info, rb_node);
1554                 rr = resolve_root(&rl, ri, root_id);
1555                 if (rr == -ENOENT) {
1556                         ret = -ENOENT;
1557                         rbn = rb_next(rbn);
1558                         continue;
1559                 }
1560                 if (!comp_entry_with_rootid(the_ri, ri, 0)) {
1561                         memcpy(the_ri, ri, offsetof(struct root_info, path));
1562                         the_ri->path = strdup_or_null(ri->path);
1563                         the_ri->name = strdup_or_null(ri->name);
1564                         the_ri->full_path = strdup_or_null(ri->full_path);
1565                         ret = 0;
1566                         break;
1567                 }
1568                 rbn = rb_next(rbn);
1569         }
1570         __free_all_subvolumn(&rl);
1571         return ret;
1572 }
1573
1574 static int print_one_extent(int fd, struct btrfs_ioctl_search_header *sh,
1575                             struct btrfs_file_extent_item *item,
1576                             u64 found_gen, u64 *cache_dirid,
1577                             char **cache_dir_name, u64 *cache_ino,
1578                             char **cache_full_name)
1579 {
1580         u64 len = 0;
1581         u64 disk_start = 0;
1582         u64 disk_offset = 0;
1583         u8 type;
1584         int compressed = 0;
1585         int flags = 0;
1586         char *name = NULL;
1587
1588         if (sh->objectid == *cache_ino) {
1589                 name = *cache_full_name;
1590         } else if (*cache_full_name) {
1591                 free(*cache_full_name);
1592                 *cache_full_name = NULL;
1593         }
1594         if (!name) {
1595                 name = ino_resolve(fd, sh->objectid, cache_dirid,
1596                                    cache_dir_name);
1597                 *cache_full_name = name;
1598                 *cache_ino = sh->objectid;
1599         }
1600         if (!name)
1601                 return -EIO;
1602
1603         type = btrfs_stack_file_extent_type(item);
1604         compressed = btrfs_stack_file_extent_compression(item);
1605
1606         if (type == BTRFS_FILE_EXTENT_REG ||
1607             type == BTRFS_FILE_EXTENT_PREALLOC) {
1608                 disk_start = btrfs_stack_file_extent_disk_bytenr(item);
1609                 disk_offset = btrfs_stack_file_extent_offset(item);
1610                 len = btrfs_stack_file_extent_num_bytes(item);
1611         } else if (type == BTRFS_FILE_EXTENT_INLINE) {
1612                 disk_start = 0;
1613                 disk_offset = 0;
1614                 len = btrfs_stack_file_extent_ram_bytes(item);
1615         } else {
1616                 printf("unhandled extent type %d for inode %llu "
1617                        "file offset %llu gen %llu\n",
1618                         type,
1619                         (unsigned long long)sh->objectid,
1620                         (unsigned long long)sh->offset,
1621                         (unsigned long long)found_gen);
1622
1623                 return -EIO;
1624         }
1625         printf("inode %llu file offset %llu len %llu disk start %llu "
1626                "offset %llu gen %llu flags ",
1627                (unsigned long long)sh->objectid,
1628                (unsigned long long)sh->offset,
1629                (unsigned long long)len,
1630                (unsigned long long)disk_start,
1631                (unsigned long long)disk_offset,
1632                (unsigned long long)found_gen);
1633
1634         if (compressed) {
1635                 printf("COMPRESS");
1636                 flags++;
1637         }
1638         if (type == BTRFS_FILE_EXTENT_PREALLOC) {
1639                 printf("%sPREALLOC", flags ? "|" : "");
1640                 flags++;
1641         }
1642         if (type == BTRFS_FILE_EXTENT_INLINE) {
1643                 printf("%sINLINE", flags ? "|" : "");
1644                 flags++;
1645         }
1646         if (!flags)
1647                 printf("NONE");
1648
1649         printf(" %s\n", name);
1650         return 0;
1651 }
1652
1653 int btrfs_list_find_updated_files(int fd, u64 root_id, u64 oldest_gen)
1654 {
1655         int ret;
1656         struct btrfs_ioctl_search_args args;
1657         struct btrfs_ioctl_search_key *sk = &args.key;
1658         struct btrfs_ioctl_search_header sh;
1659         struct btrfs_file_extent_item *item;
1660         unsigned long off = 0;
1661         u64 found_gen;
1662         u64 max_found = 0;
1663         int i;
1664         int e;
1665         u64 cache_dirid = 0;
1666         u64 cache_ino = 0;
1667         char *cache_dir_name = NULL;
1668         char *cache_full_name = NULL;
1669         struct btrfs_file_extent_item backup;
1670
1671         memset(&backup, 0, sizeof(backup));
1672         memset(&args, 0, sizeof(args));
1673
1674         sk->tree_id = root_id;
1675
1676         /*
1677          * set all the other params to the max, we'll take any objectid
1678          * and any trans
1679          */
1680         sk->max_objectid = (u64)-1;
1681         sk->max_offset = (u64)-1;
1682         sk->max_transid = (u64)-1;
1683         sk->max_type = BTRFS_EXTENT_DATA_KEY;
1684         sk->min_transid = oldest_gen;
1685         /* just a big number, doesn't matter much */
1686         sk->nr_items = 4096;
1687
1688         max_found = find_root_gen(fd);
1689         while(1) {
1690                 ret = ioctl(fd, BTRFS_IOC_TREE_SEARCH, &args);
1691                 e = errno;
1692                 if (ret < 0) {
1693                         fprintf(stderr, "ERROR: can't perform the search- %s\n",
1694                                 strerror(e));
1695                         break;
1696                 }
1697                 /* the ioctl returns the number of item it found in nr_items */
1698                 if (sk->nr_items == 0)
1699                         break;
1700
1701                 off = 0;
1702
1703                 /*
1704                  * for each item, pull the key out of the header and then
1705                  * read the root_ref item it contains
1706                  */
1707                 for (i = 0; i < sk->nr_items; i++) {
1708                         memcpy(&sh, args.buf + off, sizeof(sh));
1709                         off += sizeof(sh);
1710
1711                         /*
1712                          * just in case the item was too big, pass something other
1713                          * than garbage
1714                          */
1715                         if (sh.len == 0)
1716                                 item = &backup;
1717                         else
1718                                 item = (struct btrfs_file_extent_item *)(args.buf +
1719                                                                  off);
1720                         found_gen = btrfs_stack_file_extent_generation(item);
1721                         if (sh.type == BTRFS_EXTENT_DATA_KEY &&
1722                             found_gen >= oldest_gen) {
1723                                 print_one_extent(fd, &sh, item, found_gen,
1724                                                  &cache_dirid, &cache_dir_name,
1725                                                  &cache_ino, &cache_full_name);
1726                         }
1727                         off += sh.len;
1728
1729                         /*
1730                          * record the mins in sk so we can make sure the
1731                          * next search doesn't repeat this root
1732                          */
1733                         sk->min_objectid = sh.objectid;
1734                         sk->min_offset = sh.offset;
1735                         sk->min_type = sh.type;
1736                 }
1737                 sk->nr_items = 4096;
1738                 if (sk->min_offset < (u64)-1)
1739                         sk->min_offset++;
1740                 else if (sk->min_objectid < (u64)-1) {
1741                         sk->min_objectid++;
1742                         sk->min_offset = 0;
1743                         sk->min_type = 0;
1744                 } else
1745                         break;
1746         }
1747         free(cache_dir_name);
1748         free(cache_full_name);
1749         printf("transid marker was %llu\n", (unsigned long long)max_found);
1750         return ret;
1751 }
1752
1753 char *btrfs_list_path_for_root(int fd, u64 root)
1754 {
1755         struct root_lookup root_lookup;
1756         struct rb_node *n;
1757         char *ret_path = NULL;
1758         int ret;
1759         u64 top_id;
1760
1761         ret = btrfs_list_get_path_rootid(fd, &top_id);
1762         if (ret)
1763                 return ERR_PTR(ret);
1764
1765         ret = __list_subvol_search(fd, &root_lookup);
1766         if (ret < 0)
1767                 return ERR_PTR(ret);
1768
1769         ret = __list_subvol_fill_paths(fd, &root_lookup);
1770         if (ret < 0)
1771                 return ERR_PTR(ret);
1772
1773         n = rb_last(&root_lookup.root);
1774         while (n) {
1775                 struct root_info *entry;
1776
1777                 entry = rb_entry(n, struct root_info, rb_node);
1778                 ret = resolve_root(&root_lookup, entry, top_id);
1779                 if (ret == -ENOENT && entry->root_id == root) {
1780                         ret_path = NULL;
1781                         break;
1782                 }
1783                 if (entry->root_id == root) {
1784                         ret_path = entry->full_path;
1785                         entry->full_path = NULL;
1786                 }
1787
1788                 n = rb_prev(n);
1789         }
1790         __free_all_subvolumn(&root_lookup);
1791
1792         return ret_path;
1793 }
1794
1795 int btrfs_list_parse_sort_string(char *opt_arg,
1796                                  struct btrfs_list_comparer_set **comps)
1797 {
1798         int order;
1799         int flag;
1800         char *p;
1801         char **ptr_argv;
1802         int what_to_sort;
1803
1804         while ((p = strtok(opt_arg, ",")) != NULL) {
1805                 flag = 0;
1806                 ptr_argv = all_sort_items;
1807
1808                 while (*ptr_argv) {
1809                         if (strcmp(*ptr_argv, p) == 0) {
1810                                 flag = 1;
1811                                 break;
1812                         } else {
1813                                 p++;
1814                                 if (strcmp(*ptr_argv, p) == 0) {
1815                                         flag = 1;
1816                                         p--;
1817                                         break;
1818                                 }
1819                                 p--;
1820                         }
1821                         ptr_argv++;
1822                 }
1823
1824                 if (flag == 0)
1825                         return -1;
1826
1827                 else {
1828                         if (*p == '+') {
1829                                 order = 0;
1830                                 p++;
1831                         } else if (*p == '-') {
1832                                 order = 1;
1833                                 p++;
1834                         } else
1835                                 order = 0;
1836
1837                         what_to_sort = btrfs_list_get_sort_item(p);
1838                         btrfs_list_setup_comparer(comps, what_to_sort, order);
1839                 }
1840                 opt_arg = NULL;
1841         }
1842
1843         return 0;
1844 }
1845
1846 /*
1847  * This function is used to parse the argument of filter condition.
1848  *
1849  * type is the filter object.
1850  */
1851 int btrfs_list_parse_filter_string(char *opt_arg,
1852                                    struct btrfs_list_filter_set **filters,
1853                                    enum btrfs_list_filter_enum type)
1854 {
1855
1856         u64 arg;
1857         char *ptr_parse_end = NULL;
1858         char *ptr_opt_arg_end = opt_arg + strlen(opt_arg);
1859
1860         switch (*(opt_arg++)) {
1861         case '+':
1862                 arg = (u64)strtol(opt_arg, &ptr_parse_end, 10);
1863                 type += 2;
1864                 if (ptr_parse_end != ptr_opt_arg_end)
1865                         return -1;
1866
1867                 btrfs_list_setup_filter(filters, type, arg);
1868                 break;
1869         case '-':
1870                 arg = (u64)strtoll(opt_arg, &ptr_parse_end, 10);
1871                 type += 1;
1872                 if (ptr_parse_end != ptr_opt_arg_end)
1873                         return -1;
1874
1875                 btrfs_list_setup_filter(filters, type, arg);
1876                 break;
1877         default:
1878                 opt_arg--;
1879                 arg = (u64)strtoll(opt_arg, &ptr_parse_end, 10);
1880
1881                 if (ptr_parse_end != ptr_opt_arg_end)
1882                         return -1;
1883                 btrfs_list_setup_filter(filters, type, arg);
1884                 break;
1885         }
1886
1887         return 0;
1888 }
1889
1890 int btrfs_list_get_path_rootid(int fd, u64 *treeid)
1891 {
1892         int  ret;
1893         struct btrfs_ioctl_ino_lookup_args args;
1894
1895         memset(&args, 0, sizeof(args));
1896         args.objectid = BTRFS_FIRST_FREE_OBJECTID;
1897
1898         ret = ioctl(fd, BTRFS_IOC_INO_LOOKUP, &args);
1899         if (ret < 0) {
1900                 fprintf(stderr,
1901                         "ERROR: can't perform the search -%s\n",
1902                         strerror(errno));
1903                 return ret;
1904         }
1905         *treeid = args.treeid;
1906         return 0;
1907 }