return write_all_supers(fs_info->tree_root);
}
-static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid,
- const char *new_chunk_uuid)
+/*
+ * Change fsid of a given fs.
+ *
+ * If new_fsid_str is not given, use a random generated UUID.
+ */
+static int change_uuid(struct btrfs_fs_info *fs_info, const char *new_fsid_str)
{
+ uuid_t new_fsid;
+ uuid_t new_chunk_id;
+ char uuid_buf[BTRFS_UUID_UNPARSED_SIZE];
int ret = 0;
/* caller should do extra check on passed uuid */
- if (new_fsid) {
- /* allocated mem will be freed at close_ctree() */
- fs_info->new_fsid = malloc(BTRFS_FSID_SIZE);
- if (!fs_info->new_fsid) {
- ret = -ENOMEM;
- goto out;
- }
- ret = uuid_parse(new_fsid, fs_info->new_fsid);
- if (ret < 0)
- goto out;
- }
+ if (new_fsid_str)
+ uuid_parse(new_fsid_str, new_fsid);
+ else
+ uuid_generate(new_fsid);
- if (new_chunk_uuid) {
- /* allocated mem will be freed at close_ctree() */
- fs_info->new_chunk_tree_uuid = malloc(BTRFS_UUID_SIZE);
- if (!fs_info->new_chunk_tree_uuid) {
- ret = -ENOMEM;
- goto out;
- }
- ret = uuid_parse(new_chunk_uuid, fs_info->new_chunk_tree_uuid);
- if (ret < 0)
- goto out;
- }
+ uuid_generate(new_chunk_id);
+ fs_info->new_fsid = new_fsid;
+ fs_info->new_chunk_tree_uuid = new_chunk_id;
+ uuid_unparse_upper(new_fsid, uuid_buf);
+ printf("Changing fsid to %s\n", uuid_buf);
/* Now we can begin fsid change */
ret = change_fsid_prepare(fs_info);
if (ret < 0)
goto out;
}
- /* Last, change fsid in super, only fsid change needs this */
- if (new_fsid) {
- memcpy(fs_info->fs_devices->fsid, fs_info->new_fsid,
- BTRFS_FSID_SIZE);
- memcpy(fs_info->super_copy->fsid, fs_info->new_fsid,
- BTRFS_FSID_SIZE);
- ret = write_all_supers(fs_info->tree_root);
- if (ret < 0)
- goto out;
- }
+ /* Last, change fsid in super */
+ memcpy(fs_info->fs_devices->fsid, fs_info->new_fsid,
+ BTRFS_FSID_SIZE);
+ memcpy(fs_info->super_copy->fsid, fs_info->new_fsid,
+ BTRFS_FSID_SIZE);
+ ret = write_all_supers(fs_info->tree_root);
+ if (ret < 0)
+ goto out;
/* Now fsid change is done */
ret = change_fsid_done(fs_info);
+ fs_info->new_fsid = NULL;
+ fs_info->new_chunk_tree_uuid = NULL;
+ printf("Fsid changed to %s\n", uuid_buf);
out:
return ret;
}