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https://github.com/kdave/btrfs-progs
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Btrfs-progs: debug-tree, add option to dump a single tree
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>
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@ -41,6 +41,8 @@ static int print_usage(void)
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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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@ -136,12 +138,13 @@ int main(int ac, char **av)
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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:rRu");
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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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@ -164,6 +167,9 @@ int main(int ac, char **av)
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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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@ -208,7 +214,7 @@ int main(int ac, char **av)
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goto close_root;
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}
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if (!(extent_only || uuid_tree_only)) {
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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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@ -268,6 +274,8 @@ again:
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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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