diff options
| -rw-r--r-- | mkfs/rootdir.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/mkfs/rootdir.c b/mkfs/rootdir.c index 83a3191d..0eb3f8f2 100644 --- a/mkfs/rootdir.c +++ b/mkfs/rootdir.c @@ -26,6 +26,7 @@ #include <fcntl.h> #include <ftw.h> #include "ctree.h" +#include "volumes.h" #include "internal.h" #include "disk-io.h" #include "messages.h" @@ -733,3 +734,46 @@ u64 btrfs_mkfs_size_dir(const char *dir_name, u64 sectorsize, *size_of_data_ret = num_of_data_chunks * default_chunk_size; return total_size; } + +/* + * Get the end position of the last device extent for given @devid; + * @size_ret is exclsuive (means it should be aligned to sectorsize) + */ +static int get_device_extent_end(struct btrfs_fs_info *fs_info, + u64 devid, u64 *size_ret) +{ + struct btrfs_root *dev_root = fs_info->dev_root; + struct btrfs_key key; + struct btrfs_path path; + struct btrfs_dev_extent *de; + int ret; + + key.objectid = devid; + key.type = BTRFS_DEV_EXTENT_KEY; + key.offset = (u64)-1; + + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, dev_root, &key, &path, 0, 0); + /* Not really possible */ + BUG_ON(ret == 0); + + ret = btrfs_previous_item(dev_root, &path, devid, BTRFS_DEV_EXTENT_KEY); + if (ret < 0) + goto out; + + /* No dev_extent at all, not really possible for rootdir case */ + if (ret > 0) { + *size_ret = 0; + ret = -EUCLEAN; + goto out; + } + + btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]); + de = btrfs_item_ptr(path.nodes[0], path.slots[0], + struct btrfs_dev_extent); + *size_ret = key.offset + btrfs_dev_extent_length(path.nodes[0], de); +out: + btrfs_release_path(&path); + + return ret; +} |