debug-tree.c

   1 /*
   2  * Copyright (C) 2007 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 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <unistd.h>
  22 #include <uuid/uuid.h>
  23 #include "kerncompat.h"
  24 #include "radix-tree.h"
  25 #include "ctree.h"
  26 #include "disk-io.h"
  27 #include "print-tree.h"
  28 #include "transaction.h"
  29 #include "version.h"
  30
  31 static int print_usage(void)
  32 {
  33         fprintf(stderr, "usage: debug-tree [ -e ] device\n");
  34         fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
  35         exit(1);
  36 }
  37
  38 static void print_extent_leaf(struct btrfs_root *root, struct extent_buffer *l)
  39 {
  40         int i;
  41         struct btrfs_item *item;
  42         struct btrfs_extent_ref *ref;
  43         struct btrfs_key key;
  44         static u64 last = 0;
  45         static u64 last_len = 0;
  46         u32 nr = btrfs_header_nritems(l);
  47         u32 type;
  48
  49         for (i = 0 ; i < nr ; i++) {
  50                 item = btrfs_item_nr(l, i);
  51                 btrfs_item_key_to_cpu(l, &key, i);
  52                 type = btrfs_key_type(&key);
  53                 switch (type) {
  54                 case BTRFS_EXTENT_ITEM_KEY:
  55                         last_len = key.offset;
  56                         last = key.objectid;
  57                         break;
  58                 case BTRFS_EXTENT_REF_KEY:
  59                         ref = btrfs_item_ptr(l, i, struct btrfs_extent_ref);
  60                         printf("%llu %llu extent back ref root %llu gen %llu "
  61                                "owner %llu num_refs %lu\n",
  62                                (unsigned long long)last,
  63                                (unsigned long long)last_len,
  64                                (unsigned long long)btrfs_ref_root(l, ref),
  65                                (unsigned long long)btrfs_ref_generation(l, ref),
  66                                (unsigned long long)btrfs_ref_objectid(l, ref),
  67                                (unsigned long)btrfs_ref_num_refs(l, ref));
  68                         break;
  69                 };
  70                 fflush(stdout);
  71         }
  72 }
  73
  74 static void print_extents(struct btrfs_root *root, struct extent_buffer *eb)
  75 {
  76         int i;
  77         u32 nr;
  78         u32 size;
  79
  80         if (!eb)
  81                 return;
  82         if (btrfs_is_leaf(eb)) {
  83                 print_extent_leaf(root, eb);
  84                 return;
  85         }
  86         size = btrfs_level_size(root, btrfs_header_level(eb) - 1);
  87         nr = btrfs_header_nritems(eb);
  88         for (i = 0; i < nr; i++) {
  89                 struct extent_buffer *next = read_tree_block(root,
  90                                              btrfs_node_blockptr(eb, i),
  91                                              size,
  92                                              btrfs_node_ptr_generation(eb, i));
  93                 if (btrfs_is_leaf(next) &&
  94                     btrfs_header_level(eb) != 1)
  95                         BUG();
  96                 if (btrfs_header_level(next) !=
  97                         btrfs_header_level(eb) - 1)
  98                         BUG();
  99                 print_extents(root, next);
 100                 free_extent_buffer(next);
 101         }
 102 }
 103
 104 int main(int ac, char **av)
 105 {
 106         struct btrfs_root *root;
 107         struct btrfs_path path;
 108         struct btrfs_key key;
 109         struct btrfs_root_item ri;
 110         struct extent_buffer *leaf;
 111         struct btrfs_key found_key;
 112         char uuidbuf[37];
 113         int ret;
 114         int slot;
 115         int extent_only = 0;
 116
 117         radix_tree_init();
 118
 119         while(1) {
 120                 int c;
 121                 c = getopt(ac, av, "e");
 122                 if (c < 0)
 123                         break;
 124                 switch(c) {
 125                         case 'e':
 126                                 extent_only = 1;
 127                                 break;
 128                         default:
 129                                 print_usage();
 130                 }
 131         }
 132         ac = ac - optind;
 133         if (ac != 1)
 134                 print_usage();
 135
 136         root = open_ctree(av[optind], 0, 0);
 137         if (!root) {
 138                 fprintf(stderr, "unable to open %s\n", av[optind]);
 139                 exit(1);
 140         }
 141         if (!extent_only) {
 142                 printf("root tree\n");
 143                 btrfs_print_tree(root->fs_info->tree_root,
 144                                  root->fs_info->tree_root->node);
 145
 146                 printf("chunk tree\n");
 147                 btrfs_print_tree(root->fs_info->chunk_root,
 148                                  root->fs_info->chunk_root->node);
 149         }
 150         btrfs_init_path(&path);
 151         key.offset = 0;
 152         key.objectid = 0;
 153         btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
 154         ret = btrfs_search_slot(NULL, root->fs_info->tree_root,
 155                                         &key, &path, 0, 0);
 156         BUG_ON(ret < 0);
 157         while(1) {
 158                 leaf = path.nodes[0];
 159                 slot = path.slots[0];
 160                 if (slot >= btrfs_header_nritems(leaf)) {
 161                         ret = btrfs_next_leaf(root, &path);
 162                         if (ret != 0)
 163                                 break;
 164                         leaf = path.nodes[0];
 165                         slot = path.slots[0];
 166                 }
 167                 btrfs_item_key_to_cpu(leaf, &found_key, path.slots[0]);
 168                 if (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) {
 169                         unsigned long offset;
 170                         struct extent_buffer *buf;
 171                         int skip = extent_only;
 172
 173                         offset = btrfs_item_ptr_offset(leaf, slot);
 174                         read_extent_buffer(leaf, &ri, offset, sizeof(ri));
 175                         buf = read_tree_block(root->fs_info->tree_root,
 176                                               btrfs_root_bytenr(&ri),
 177                                               root->leafsize, 0);
 178                         switch(found_key.objectid) {
 179                         case BTRFS_ROOT_TREE_OBJECTID:
 180                                 if (!skip)
 181                                         printf("root ");
 182                                 break;
 183                         case BTRFS_DEV_TREE_OBJECTID:
 184                                 if (!skip) {
 185                                         printf("device extent tree ");
 186                                 }
 187                                 break;
 188                         case BTRFS_EXTENT_TREE_OBJECTID:
 189                                 skip = 0;
 190                                 if (!extent_only)
 191                                         printf("extent tree ");
 192                                 break;
 193                         }
 194                         if (!skip && !extent_only) {
 195                                 printf("tree %llu %u %llu\n",
 196                                        (unsigned long long)found_key.objectid,
 197                                        found_key.type,
 198                                        (unsigned long long)found_key.offset);
 199                                 btrfs_print_tree(root, buf);
 200                         } else if (extent_only && !skip) {
 201                                 print_extents(root, buf);
 202                         }
 203                 }
 204                 path.slots[0]++;
 205         }
 206         btrfs_release_path(root, &path);
 207         if (extent_only)
 208                 return 0;
 209
 210         printf("total bytes %llu\n",
 211                (unsigned long long)btrfs_super_total_bytes(&root->fs_info->super_copy));
 212         printf("bytes used %llu\n",
 213                (unsigned long long)btrfs_super_bytes_used(&root->fs_info->super_copy));
 214         uuidbuf[36] = '\0';
 215         uuid_unparse(root->fs_info->super_copy.fsid, uuidbuf);
 216         printf("uuid %s\n", uuidbuf);
 217         printf("%s\n", BTRFS_BUILD_VERSION);
 218         return 0;
 219 }