mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-23 22:53:35 +00:00
602aac5dbf
Very often while debugging filesystems with many subvolumes and/or snapshots, specially when they are large, I want to see only the content of one of the trees. So this change just adds an option to btrfs-debug-tree to allow to specify the id of the tree we're interesting in dumping to stdout. Example: btrfs-debug-tree -t 257 /dev/sdc Will only dump the tree of the first snapshot or subvolume that was created. Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com> Signed-off-by: David Sterba <dsterba@suse.cz>
412 lines
10 KiB
C
412 lines
10 KiB
C
/*
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* Copyright (C) 2007 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <uuid/uuid.h>
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#include "kerncompat.h"
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#include "radix-tree.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "print-tree.h"
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#include "transaction.h"
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#include "version.h"
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#include "utils.h"
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static int print_usage(void)
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{
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fprintf(stderr, "usage: btrfs-debug-tree [-e] [-d] [-r] [-R] [-u]\n");
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fprintf(stderr, " [-b block_num ] device\n");
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fprintf(stderr, "\t-e : print detailed extents info\n");
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fprintf(stderr, "\t-d : print info of btrfs device and root tree dirs"
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" only\n");
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fprintf(stderr, "\t-r : print info of roots only\n");
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fprintf(stderr, "\t-R : print info of roots and root backups\n");
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fprintf(stderr, "\t-u : print info of uuid tree only\n");
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fprintf(stderr, "\t-b block_num : print info of the specified block"
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" only\n");
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fprintf(stderr,
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"\t-t tree_id : print only the tree with the given id\n");
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fprintf(stderr, "%s\n", BTRFS_BUILD_VERSION);
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exit(1);
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}
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static void print_extents(struct btrfs_root *root, struct extent_buffer *eb)
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{
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int i;
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u32 nr;
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u32 size;
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if (!eb)
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return;
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if (btrfs_is_leaf(eb)) {
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btrfs_print_leaf(root, eb);
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return;
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}
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size = btrfs_level_size(root, btrfs_header_level(eb) - 1);
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nr = btrfs_header_nritems(eb);
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for (i = 0; i < nr; i++) {
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struct extent_buffer *next = read_tree_block(root,
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btrfs_node_blockptr(eb, i),
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size,
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btrfs_node_ptr_generation(eb, i));
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if (btrfs_is_leaf(next) &&
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btrfs_header_level(eb) != 1)
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BUG();
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if (btrfs_header_level(next) !=
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btrfs_header_level(eb) - 1)
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BUG();
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print_extents(root, next);
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free_extent_buffer(next);
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}
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}
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static void print_old_roots(struct btrfs_super_block *super)
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{
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struct btrfs_root_backup *backup;
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int i;
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for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
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backup = super->super_roots + i;
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printf("btrfs root backup slot %d\n", i);
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printf("\ttree root gen %llu block %llu\n",
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(unsigned long long)btrfs_backup_tree_root_gen(backup),
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(unsigned long long)btrfs_backup_tree_root(backup));
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printf("\t\textent root gen %llu block %llu\n",
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(unsigned long long)btrfs_backup_extent_root_gen(backup),
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(unsigned long long)btrfs_backup_extent_root(backup));
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printf("\t\tchunk root gen %llu block %llu\n",
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(unsigned long long)btrfs_backup_chunk_root_gen(backup),
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(unsigned long long)btrfs_backup_chunk_root(backup));
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printf("\t\tdevice root gen %llu block %llu\n",
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(unsigned long long)btrfs_backup_dev_root_gen(backup),
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(unsigned long long)btrfs_backup_dev_root(backup));
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printf("\t\tcsum root gen %llu block %llu\n",
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(unsigned long long)btrfs_backup_csum_root_gen(backup),
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(unsigned long long)btrfs_backup_csum_root(backup));
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printf("\t\tfs root gen %llu block %llu\n",
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(unsigned long long)btrfs_backup_fs_root_gen(backup),
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(unsigned long long)btrfs_backup_fs_root(backup));
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printf("\t\t%llu used %llu total %llu devices\n",
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(unsigned long long)btrfs_backup_bytes_used(backup),
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(unsigned long long)btrfs_backup_total_bytes(backup),
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(unsigned long long)btrfs_backup_num_devices(backup));
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}
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}
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int main(int ac, char **av)
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{
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struct btrfs_root *root;
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struct btrfs_fs_info *info;
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struct btrfs_path path;
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struct btrfs_key key;
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struct btrfs_root_item ri;
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struct extent_buffer *leaf;
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struct btrfs_disk_key disk_key;
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struct btrfs_key found_key;
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char uuidbuf[BTRFS_UUID_UNPARSED_SIZE];
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int ret;
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int slot;
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int extent_only = 0;
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int device_only = 0;
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int uuid_tree_only = 0;
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int roots_only = 0;
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int root_backups = 0;
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u64 block_only = 0;
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struct btrfs_root *tree_root_scan;
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u64 tree_id = 0;
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radix_tree_init();
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while(1) {
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int c;
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c = getopt(ac, av, "deb:rRut:");
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if (c < 0)
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break;
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switch(c) {
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case 'e':
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extent_only = 1;
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break;
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case 'd':
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device_only = 1;
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break;
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case 'r':
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roots_only = 1;
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break;
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case 'u':
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uuid_tree_only = 1;
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break;
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case 'R':
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roots_only = 1;
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root_backups = 1;
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break;
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case 'b':
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block_only = arg_strtou64(optarg);
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break;
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case 't':
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tree_id = arg_strtou64(optarg);
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break;
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default:
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print_usage();
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}
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}
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ac = ac - optind;
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if (ac != 1)
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print_usage();
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info = open_ctree_fs_info(av[optind], 0, 0, OPEN_CTREE_PARTIAL);
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if (!info) {
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fprintf(stderr, "unable to open %s\n", av[optind]);
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exit(1);
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}
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root = info->fs_root;
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if (!root) {
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fprintf(stderr, "unable to open %s\n", av[optind]);
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exit(1);
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}
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if (block_only) {
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leaf = read_tree_block(root,
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block_only,
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root->leafsize, 0);
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if (leaf && btrfs_header_level(leaf) != 0) {
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free_extent_buffer(leaf);
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leaf = NULL;
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}
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if (!leaf) {
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leaf = read_tree_block(root,
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block_only,
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root->nodesize, 0);
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}
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if (!leaf) {
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fprintf(stderr, "failed to read %llu\n",
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(unsigned long long)block_only);
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goto close_root;
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}
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btrfs_print_tree(root, leaf, 0);
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goto close_root;
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}
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if (!(extent_only || uuid_tree_only || tree_id)) {
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if (roots_only) {
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printf("root tree: %llu level %d\n",
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(unsigned long long)info->tree_root->node->start,
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btrfs_header_level(info->tree_root->node));
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printf("chunk tree: %llu level %d\n",
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(unsigned long long)info->chunk_root->node->start,
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btrfs_header_level(info->chunk_root->node));
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} else {
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if (info->tree_root->node) {
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printf("root tree\n");
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btrfs_print_tree(info->tree_root,
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info->tree_root->node, 1);
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}
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if (info->chunk_root->node) {
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printf("chunk tree\n");
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btrfs_print_tree(info->chunk_root,
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info->chunk_root->node, 1);
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}
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}
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}
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tree_root_scan = info->tree_root;
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btrfs_init_path(&path);
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again:
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if (!extent_buffer_uptodate(tree_root_scan->node))
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goto no_node;
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key.offset = 0;
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key.objectid = 0;
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btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
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ret = btrfs_search_slot(NULL, tree_root_scan, &key, &path, 0, 0);
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BUG_ON(ret < 0);
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while(1) {
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leaf = path.nodes[0];
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slot = path.slots[0];
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if (slot >= btrfs_header_nritems(leaf)) {
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ret = btrfs_next_leaf(tree_root_scan, &path);
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if (ret != 0)
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break;
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leaf = path.nodes[0];
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slot = path.slots[0];
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}
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btrfs_item_key(leaf, &disk_key, path.slots[0]);
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btrfs_disk_key_to_cpu(&found_key, &disk_key);
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if (btrfs_key_type(&found_key) == BTRFS_ROOT_ITEM_KEY) {
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unsigned long offset;
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struct extent_buffer *buf;
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int skip = extent_only | device_only | uuid_tree_only;
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offset = btrfs_item_ptr_offset(leaf, slot);
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read_extent_buffer(leaf, &ri, offset, sizeof(ri));
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buf = read_tree_block(tree_root_scan,
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btrfs_root_bytenr(&ri),
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btrfs_level_size(tree_root_scan,
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btrfs_root_level(&ri)),
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0);
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if (!extent_buffer_uptodate(buf))
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goto next;
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if (tree_id && found_key.objectid != tree_id)
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goto next;
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switch(found_key.objectid) {
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case BTRFS_ROOT_TREE_OBJECTID:
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if (!skip)
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printf("root");
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break;
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case BTRFS_EXTENT_TREE_OBJECTID:
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if (!device_only && !uuid_tree_only)
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skip = 0;
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if (!skip)
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printf("extent");
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break;
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case BTRFS_CHUNK_TREE_OBJECTID:
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if (!skip) {
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printf("chunk");
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}
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break;
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case BTRFS_DEV_TREE_OBJECTID:
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if (!uuid_tree_only)
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skip = 0;
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if (!skip)
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printf("device");
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break;
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case BTRFS_FS_TREE_OBJECTID:
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if (!skip) {
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printf("fs");
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}
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break;
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case BTRFS_ROOT_TREE_DIR_OBJECTID:
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skip = 0;
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printf("directory");
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break;
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case BTRFS_CSUM_TREE_OBJECTID:
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if (!skip) {
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printf("checksum");
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}
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break;
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case BTRFS_ORPHAN_OBJECTID:
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if (!skip) {
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printf("orphan");
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}
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break;
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case BTRFS_TREE_LOG_OBJECTID:
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if (!skip) {
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printf("log");
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}
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break;
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case BTRFS_TREE_LOG_FIXUP_OBJECTID:
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if (!skip) {
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printf("log fixup");
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}
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break;
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case BTRFS_TREE_RELOC_OBJECTID:
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if (!skip) {
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printf("reloc");
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}
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break;
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case BTRFS_DATA_RELOC_TREE_OBJECTID:
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if (!skip) {
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printf("data reloc");
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}
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break;
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case BTRFS_EXTENT_CSUM_OBJECTID:
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if (!skip) {
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printf("extent checksum");
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}
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break;
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case BTRFS_QUOTA_TREE_OBJECTID:
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if (!skip) {
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printf("quota");
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}
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break;
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case BTRFS_UUID_TREE_OBJECTID:
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if (!extent_only && !device_only)
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skip = 0;
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if (!skip)
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printf("uuid");
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break;
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case BTRFS_MULTIPLE_OBJECTIDS:
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if (!skip) {
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printf("multiple");
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}
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break;
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default:
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if (!skip) {
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printf("file");
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}
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}
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if (extent_only && !skip) {
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print_extents(tree_root_scan, buf);
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} else if (!skip) {
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printf(" tree ");
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btrfs_print_key(&disk_key);
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if (roots_only) {
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printf(" %llu level %d\n",
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(unsigned long long)buf->start,
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btrfs_header_level(buf));
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} else {
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printf(" \n");
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btrfs_print_tree(tree_root_scan, buf, 1);
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}
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}
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free_extent_buffer(buf);
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}
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next:
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path.slots[0]++;
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}
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no_node:
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btrfs_release_path(&path);
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if (tree_root_scan == info->tree_root &&
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info->log_root_tree) {
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tree_root_scan = info->log_root_tree;
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goto again;
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}
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if (extent_only || device_only || uuid_tree_only)
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goto close_root;
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if (root_backups)
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print_old_roots(info->super_copy);
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printf("total bytes %llu\n",
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(unsigned long long)btrfs_super_total_bytes(info->super_copy));
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printf("bytes used %llu\n",
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(unsigned long long)btrfs_super_bytes_used(info->super_copy));
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uuidbuf[BTRFS_UUID_UNPARSED_SIZE - 1] = '\0';
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uuid_unparse(info->super_copy->fsid, uuidbuf);
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printf("uuid %s\n", uuidbuf);
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printf("%s\n", BTRFS_BUILD_VERSION);
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close_root:
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return close_ctree(root);
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}
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