Example #1
0
int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
		    int verify)
{
	u16 csum_size =
		btrfs_super_csum_size(root->fs_info->super_copy);
	return csum_tree_block_size(buf, csum_size, verify);
}
Example #2
0
int main(int argc, char **argv)
{
	struct btrfs_root *root;
	int dev_fd;
	int opt;
	int ret;

	while ((opt = getopt(argc, argv, "l:o:g:")) != -1) {
		switch(opt) {
			case 'o':
				search_objectid = arg_strtou64(optarg);
				break;
			case 'g':
				search_generation = arg_strtou64(optarg);
				break;
			case 'l':
				search_level = arg_strtou64(optarg);
				break;
			default:
				usage();
				exit(1);
		}
	}

	set_argv0(argv);
	argc = argc - optind;
	if (check_argc_min(argc, 1)) {
		usage();
		exit(1);
	}

	dev_fd = open(argv[optind], O_RDONLY);
	if (dev_fd < 0) {
		fprintf(stderr, "Failed to open device %s\n", argv[optind]);
		exit(1);
	}

	root = open_ctree_broken(dev_fd, argv[optind]);
	close(dev_fd);

	if (!root) {
		fprintf(stderr, "Open ctree failed\n");
		exit(1);
	}

	if (search_generation == 0)
		search_generation = btrfs_super_generation(root->fs_info->super_copy);

	csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
	ret = find_root(root);
	close_ctree(root);
	return ret;
}
Example #3
0
/*
 * helper function for csum removal, this expects the
 * key to describe the csum pointed to by the path, and it expects
 * the csum to overlap the range [bytenr, len]
 *
 * The csum should not be entirely contained in the range and the
 * range should not be entirely contained in the csum.
 *
 * This calls btrfs_truncate_item with the correct args based on the
 * overlap, and fixes up the key as required.
 */
static noinline int truncate_one_csum(struct btrfs_trans_handle *trans,
				      struct btrfs_root *root,
				      struct btrfs_path *path,
				      struct btrfs_key *key,
				      u64 bytenr, u64 len)
{
	struct extent_buffer *leaf;
	u16 csum_size =
		btrfs_super_csum_size(&root->fs_info->super_copy);
	u64 csum_end;
	u64 end_byte = bytenr + len;
	u32 blocksize = root->sectorsize;
	int ret;

	leaf = path->nodes[0];
	csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
	csum_end *= root->sectorsize;
	csum_end += key->offset;

	if (key->offset < bytenr && csum_end <= end_byte) {
		/*
		 *         [ bytenr - len ]
		 *         [   ]
		 *   [csum     ]
		 *   A simple truncate off the end of the item
		 */
		u32 new_size = (bytenr - key->offset) / blocksize;
		new_size *= csum_size;
		ret = btrfs_truncate_item(trans, root, path, new_size, 1);
		BUG_ON(ret);
	} else if (key->offset >= bytenr && csum_end > end_byte &&
		   end_byte > key->offset) {
		/*
		 *         [ bytenr - len ]
		 *                 [ ]
		 *                 [csum     ]
		 * we need to truncate from the beginning of the csum
		 */
		u32 new_size = (csum_end - end_byte) / blocksize;
		new_size *= csum_size;

		ret = btrfs_truncate_item(trans, root, path, new_size, 0);
		BUG_ON(ret);

		key->offset = end_byte;
		ret = btrfs_set_item_key_safe(trans, root, path, key);
		BUG_ON(ret);
	} else {
		BUG();
	}
	return 0;
}
Example #4
0
static struct btrfs_csum_item *
btrfs_lookup_csum(struct btrfs_trans_handle *trans,
                  struct btrfs_root *root,
                  struct btrfs_path *path,
                  u64 bytenr, int cow)
{
    int ret;
    struct btrfs_key file_key;
    struct btrfs_key found_key;
    struct btrfs_csum_item *item;
    struct extent_buffer *leaf;
    u64 csum_offset = 0;
    u16 csum_size =
        btrfs_super_csum_size(root->fs_info->super_copy);
    int csums_in_item;

    file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
    file_key.offset = bytenr;
    btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
    ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
    if (ret < 0)
        goto fail;
    leaf = path->nodes[0];
    if (ret > 0) {
        ret = 1;
        if (path->slots[0] == 0)
            goto fail;
        path->slots[0]--;
        btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
        if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
            goto fail;

        csum_offset = (bytenr - found_key.offset) / root->sectorsize;
        csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
        csums_in_item /= csum_size;

        if (csum_offset >= csums_in_item) {
            ret = -EFBIG;
            goto fail;
        }
    }
    item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
    item = (struct btrfs_csum_item *)((unsigned char *)item +
                                      csum_offset * csum_size);
    return item;
fail:
    if (ret > 0)
        ret = -ENOENT;
    return ERR_PTR(ret);
}
Example #5
0
static struct btrfs_csum_item *
btrfs_lookup_csum(struct btrfs_trans_handle *trans,
		  struct btrfs_root *root,
		  struct btrfs_path *path,
		  u64 bytenr, int cow)
{
	int ret;
	struct btrfs_key file_key;
	struct btrfs_key found_key;
	struct btrfs_csum_item *item;
	struct extent_buffer *leaf;
	u64 csum_offset = 0;
	u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
	int csums_in_item;

	file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
	file_key.offset = bytenr;
	btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
	ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
	if (ret < 0)
		goto fail;
	leaf = path->nodes[0];
	if (ret > 0) {
		ret = 1;
		if (path->slots[0] == 0)
			goto fail;
		path->slots[0]--;
		btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
		if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
			goto fail;

		csum_offset = (bytenr - found_key.offset) >>
				root->fs_info->sb->s_blocksize_bits;
		csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
		csums_in_item /= csum_size;

		if (csum_offset == csums_in_item) {
			ret = -EFBIG;
			goto fail;
		} else if (csum_offset > csums_in_item) {
			goto fail;
		}
	}
Example #6
0
/*
 * deletes the csum items from the csum tree for a given
 * range of bytes.
 */
int btrfs_del_csums(struct btrfs_trans_handle *trans,
		    struct btrfs_root *root, u64 bytenr, u64 len)
{
	struct btrfs_path *path;
	struct btrfs_key key;
	u64 end_byte = bytenr + len;
	u64 csum_end;
	struct extent_buffer *leaf;
	int ret;
	u16 csum_size =
		btrfs_super_csum_size(&root->fs_info->super_copy);
	int blocksize = root->sectorsize;

	root = root->fs_info->csum_root;

	path = btrfs_alloc_path();

	while (1) {
		key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
		key.offset = end_byte - 1;
		key.type = BTRFS_EXTENT_CSUM_KEY;

		ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
		if (ret > 0) {
			if (path->slots[0] == 0)
				goto out;
			path->slots[0]--;
		}
		leaf = path->nodes[0];
		btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);

		if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
		    key.type != BTRFS_EXTENT_CSUM_KEY) {
			break;
		}

		if (key.offset >= end_byte)
			break;

		csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
		csum_end *= blocksize;
		csum_end += key.offset;

		/* this csum ends before we start, we're done */
		if (csum_end <= bytenr)
			break;

		/* delete the entire item, it is inside our range */
		if (key.offset >= bytenr && csum_end <= end_byte) {
			ret = btrfs_del_item(trans, root, path);
			BUG_ON(ret);
		} else if (key.offset < bytenr && csum_end > end_byte) {
			unsigned long offset;
			unsigned long shift_len;
			unsigned long item_offset;
			/*
			 *        [ bytenr - len ]
			 *     [csum                ]
			 *
			 * Our bytes are in the middle of the csum,
			 * we need to split this item and insert a new one.
			 *
			 * But we can't drop the path because the
			 * csum could change, get removed, extended etc.
			 *
			 * The trick here is the max size of a csum item leaves
			 * enough room in the tree block for a single
			 * item header.  So, we split the item in place,
			 * adding a new header pointing to the existing
			 * bytes.  Then we loop around again and we have
			 * a nicely formed csum item that we can neatly
			 * truncate.
			 */
			offset = (bytenr - key.offset) / blocksize;
			offset *= csum_size;

			shift_len = (len / blocksize) * csum_size;

			item_offset = btrfs_item_ptr_offset(leaf,
							    path->slots[0]);

			memset_extent_buffer(leaf, 0, item_offset + offset,
					     shift_len);
			key.offset = bytenr;

			/*
			 * btrfs_split_item returns -EAGAIN when the
			 * item changed size or key
			 */
			ret = btrfs_split_item(trans, root, path, &key, offset);
			BUG_ON(ret && ret != -EAGAIN);

			key.offset = end_byte - 1;
		} else {
			ret = truncate_one_csum(trans, root, path,
						&key, bytenr, len);
			BUG_ON(ret);
		}
		btrfs_release_path(root, path);
	}
out:
	btrfs_free_path(path);
	return 0;
}
Example #7
0
int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
			  struct btrfs_root *root, u64 alloc_end,
			  u64 bytenr, char *data, size_t len)
{
	int ret;
	struct btrfs_key file_key;
	struct btrfs_key found_key;
	u64 next_offset = (u64)-1;
	int found_next = 0;
	struct btrfs_path *path;
	struct btrfs_csum_item *item;
	struct extent_buffer *leaf = NULL;
	u64 csum_offset;
	u32 csum_result = ~(u32)0;
	u32 nritems;
	u32 ins_size;
	u16 csum_size =
		btrfs_super_csum_size(&root->fs_info->super_copy);

	path = btrfs_alloc_path();
	BUG_ON(!path);

	file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
	file_key.offset = bytenr;
	file_key.type = BTRFS_EXTENT_CSUM_KEY;

	item = btrfs_lookup_csum(trans, root, path, bytenr, 1);
	if (!IS_ERR(item)) {
		leaf = path->nodes[0];
		goto found;
	}
	ret = PTR_ERR(item);
	if (ret == -EFBIG) {
		u32 item_size;
		/* we found one, but it isn't big enough yet */
		leaf = path->nodes[0];
		item_size = btrfs_item_size_nr(leaf, path->slots[0]);
		if ((item_size / csum_size) >= MAX_CSUM_ITEMS(root, csum_size)) {
			/* already at max size, make a new one */
			goto insert;
		}
	} else {
		int slot = path->slots[0] + 1;
		/* we didn't find a csum item, insert one */
		nritems = btrfs_header_nritems(path->nodes[0]);
		if (path->slots[0] >= nritems - 1) {
			ret = btrfs_next_leaf(root, path);
			if (ret == 1)
				found_next = 1;
			if (ret != 0)
				goto insert;
			slot = 0;
		}
		btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
		if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
		    found_key.type != BTRFS_EXTENT_CSUM_KEY) {
			found_next = 1;
			goto insert;
		}
		next_offset = found_key.offset;
		found_next = 1;
		goto insert;
	}

	/*
	 * at this point, we know the tree has an item, but it isn't big
	 * enough yet to put our csum in.  Grow it
	 */
	btrfs_release_path(root, path);
	ret = btrfs_search_slot(trans, root, &file_key, path,
				csum_size, 1);
	if (ret < 0)
		goto fail;
	if (ret == 0) {
		BUG();
	}
	if (path->slots[0] == 0) {
		goto insert;
	}
	path->slots[0]--;
	leaf = path->nodes[0];
	btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
	csum_offset = (file_key.offset - found_key.offset) / root->sectorsize;
	if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
	    found_key.type != BTRFS_EXTENT_CSUM_KEY ||
	    csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
		goto insert;
	}
	if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) /
	    csum_size) {
		u32 diff = (csum_offset + 1) * csum_size;
		diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
		if (diff != csum_size)
			goto insert;
		ret = btrfs_extend_item(trans, root, path, diff);
		BUG_ON(ret);
		goto csum;
	}

insert:
	btrfs_release_path(root, path);
	csum_offset = 0;
	if (found_next) {
		u64 tmp = min(alloc_end, next_offset);
		tmp -= file_key.offset;
		tmp /= root->sectorsize;
		tmp = max((u64)1, tmp);
		tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
		ins_size = csum_size * tmp;
	} else {
		ins_size = csum_size;
	}
	ret = btrfs_insert_empty_item(trans, root, path, &file_key,
				      ins_size);
	if (ret < 0)
		goto fail;
	if (ret != 0) {
		WARN_ON(1);
		goto fail;
	}
csum:
	leaf = path->nodes[0];
	item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
	ret = 0;
	item = (struct btrfs_csum_item *)((unsigned char *)item +
					  csum_offset * csum_size);
found:
	csum_result = btrfs_csum_data(root, data, csum_result, len);
	btrfs_csum_final(csum_result, (char *)&csum_result);
	if (csum_result == 0) {
		printk("csum result is 0 for block %llu\n",
		       (unsigned long long)bytenr);
	}

	write_extent_buffer(leaf, &csum_result, (unsigned long)item,
			    csum_size);
	btrfs_mark_buffer_dirty(path->nodes[0]);
fail:
	btrfs_release_path(root, path);
	btrfs_free_path(path);
	return ret;
}
Example #8
0
static void dump_superblock(struct btrfs_super_block *sb, int full)
{
	int i;
	char *s, buf[BTRFS_UUID_UNPARSED_SIZE];
	u8 *p;

	printf("csum\t\t\t0x");
	for (i = 0, p = sb->csum; i < btrfs_super_csum_size(sb); i++)
		printf("%02x", p[i]);
	if (check_csum_sblock(sb, btrfs_super_csum_size(sb)))
		printf(" [match]");
	else
		printf(" [DON'T MATCH]");
	putchar('\n');

	printf("bytenr\t\t\t%llu\n",
		(unsigned long long)btrfs_super_bytenr(sb));
	printf("flags\t\t\t0x%llx\n",
		(unsigned long long)btrfs_super_flags(sb));
	print_readable_super_flag(btrfs_super_flags(sb));

	printf("magic\t\t\t");
	s = (char *) &sb->magic;
	for (i = 0; i < 8; i++)
		putchar(isprint(s[i]) ? s[i] : '.');
	if (btrfs_super_magic(sb) == BTRFS_MAGIC)
		printf(" [match]\n");
	else
		printf(" [DON'T MATCH]\n");

	uuid_unparse(sb->fsid, buf);
	printf("fsid\t\t\t%s\n", buf);

	printf("label\t\t\t");
	s = sb->label;
	for (i = 0; i < BTRFS_LABEL_SIZE && s[i]; i++)
		putchar(isprint(s[i]) ? s[i] : '.');
	putchar('\n');

	printf("generation\t\t%llu\n",
	       (unsigned long long)btrfs_super_generation(sb));
	printf("root\t\t\t%llu\n", (unsigned long long)btrfs_super_root(sb));
	printf("sys_array_size\t\t%llu\n",
	       (unsigned long long)btrfs_super_sys_array_size(sb));
	printf("chunk_root_generation\t%llu\n",
	       (unsigned long long)btrfs_super_chunk_root_generation(sb));
	printf("root_level\t\t%llu\n",
	       (unsigned long long)btrfs_super_root_level(sb));
	printf("chunk_root\t\t%llu\n",
	       (unsigned long long)btrfs_super_chunk_root(sb));
	printf("chunk_root_level\t%llu\n",
	       (unsigned long long)btrfs_super_chunk_root_level(sb));
	printf("log_root\t\t%llu\n",
	       (unsigned long long)btrfs_super_log_root(sb));
	printf("log_root_transid\t%llu\n",
	       (unsigned long long)btrfs_super_log_root_transid(sb));
	printf("log_root_level\t\t%llu\n",
	       (unsigned long long)btrfs_super_log_root_level(sb));
	printf("total_bytes\t\t%llu\n",
	       (unsigned long long)btrfs_super_total_bytes(sb));
	printf("bytes_used\t\t%llu\n",
	       (unsigned long long)btrfs_super_bytes_used(sb));
	printf("sectorsize\t\t%llu\n",
	       (unsigned long long)btrfs_super_sectorsize(sb));
	printf("nodesize\t\t%llu\n",
	       (unsigned long long)btrfs_super_nodesize(sb));
	printf("leafsize\t\t%llu\n",
	       (unsigned long long)btrfs_super_leafsize(sb));
	printf("stripesize\t\t%llu\n",
	       (unsigned long long)btrfs_super_stripesize(sb));
	printf("root_dir\t\t%llu\n",
	       (unsigned long long)btrfs_super_root_dir(sb));
	printf("num_devices\t\t%llu\n",
	       (unsigned long long)btrfs_super_num_devices(sb));
	printf("compat_flags\t\t0x%llx\n",
	       (unsigned long long)btrfs_super_compat_flags(sb));
	printf("compat_ro_flags\t\t0x%llx\n",
	       (unsigned long long)btrfs_super_compat_ro_flags(sb));
	printf("incompat_flags\t\t0x%llx\n",
	       (unsigned long long)btrfs_super_incompat_flags(sb));
	print_readable_incompat_flag(btrfs_super_incompat_flags(sb));
	printf("csum_type\t\t%llu\n",
	       (unsigned long long)btrfs_super_csum_type(sb));
	printf("csum_size\t\t%llu\n",
	       (unsigned long long)btrfs_super_csum_size(sb));
	printf("cache_generation\t%llu\n",
	       (unsigned long long)btrfs_super_cache_generation(sb));
	printf("uuid_tree_generation\t%llu\n",
	       (unsigned long long)btrfs_super_uuid_tree_generation(sb));

	uuid_unparse(sb->dev_item.uuid, buf);
	printf("dev_item.uuid\t\t%s\n", buf);

	uuid_unparse(sb->dev_item.fsid, buf);
	printf("dev_item.fsid\t\t%s %s\n", buf,
		!memcmp(sb->dev_item.fsid, sb->fsid, BTRFS_FSID_SIZE) ?
			"[match]" : "[DON'T MATCH]");

	printf("dev_item.type\t\t%llu\n", (unsigned long long)
	       btrfs_stack_device_type(&sb->dev_item));
	printf("dev_item.total_bytes\t%llu\n", (unsigned long long)
	       btrfs_stack_device_total_bytes(&sb->dev_item));
	printf("dev_item.bytes_used\t%llu\n", (unsigned long long)
	       btrfs_stack_device_bytes_used(&sb->dev_item));
	printf("dev_item.io_align\t%u\n", (unsigned int)
	       btrfs_stack_device_io_align(&sb->dev_item));
	printf("dev_item.io_width\t%u\n", (unsigned int)
	       btrfs_stack_device_io_width(&sb->dev_item));
	printf("dev_item.sector_size\t%u\n", (unsigned int)
	       btrfs_stack_device_sector_size(&sb->dev_item));
	printf("dev_item.devid\t\t%llu\n",
	       btrfs_stack_device_id(&sb->dev_item));
	printf("dev_item.dev_group\t%u\n", (unsigned int)
	       btrfs_stack_device_group(&sb->dev_item));
	printf("dev_item.seek_speed\t%u\n", (unsigned int)
	       btrfs_stack_device_seek_speed(&sb->dev_item));
	printf("dev_item.bandwidth\t%u\n", (unsigned int)
	       btrfs_stack_device_bandwidth(&sb->dev_item));
	printf("dev_item.generation\t%llu\n", (unsigned long long)
	       btrfs_stack_device_generation(&sb->dev_item));
	if (full) {
		printf("sys_chunk_array[%d]:\n", BTRFS_SYSTEM_CHUNK_ARRAY_SIZE);
		print_sys_chunk_array(sb);
		printf("backup_roots[%d]:\n", BTRFS_NUM_BACKUP_ROOTS);
		print_backup_roots(sb);
	}
}