diff options
Diffstat (limited to 'utils.c')
| -rw-r--r-- | utils.c | 48 |
1 files changed, 45 insertions, 3 deletions
@@ -93,12 +93,41 @@ static u64 reference_root_table[] = { [6] = BTRFS_CSUM_TREE_OBJECTID, }; -int make_btrfs(int fd, const char *device, const char *label, +int test_uuid_unique(char *fs_uuid) +{ + int unique = 1; + blkid_dev_iterate iter = NULL; + blkid_dev dev = NULL; + blkid_cache cache = NULL; + + if (blkid_get_cache(&cache, 0) < 0) { + printf("ERROR: lblkid cache get failed\n"); + return 1; + } + blkid_probe_all(cache); + iter = blkid_dev_iterate_begin(cache); + blkid_dev_set_search(iter, "UUID", fs_uuid); + + while (blkid_dev_next(iter, &dev) == 0) { + dev = blkid_verify(cache, dev); + if (dev) { + unique = 0; + break; + } + } + + blkid_dev_iterate_end(iter); + blkid_put_cache(cache); + + return unique; +} + +int make_btrfs(int fd, const char *device, const char *label, char *fs_uuid, u64 blocks[7], u64 num_bytes, u32 nodesize, u32 leafsize, u32 sectorsize, u32 stripesize, u64 features) { struct btrfs_super_block super; - struct extent_buffer *buf; + struct extent_buffer *buf = NULL; struct btrfs_root_item root_item; struct btrfs_disk_key disk_key; struct btrfs_extent_item *extent_item; @@ -125,7 +154,20 @@ int make_btrfs(int fd, const char *device, const char *label, memset(&super, 0, sizeof(super)); num_bytes = (num_bytes / sectorsize) * sectorsize; - uuid_generate(super.fsid); + if (fs_uuid) { + if (uuid_parse(fs_uuid, super.fsid) != 0) { + fprintf(stderr, "could not parse UUID: %s\n", fs_uuid); + ret = -EINVAL; + goto out; + } + if (!test_uuid_unique(fs_uuid)) { + fprintf(stderr, "non-unique UUID: %s\n", fs_uuid); + ret = -EBUSY; + goto out; + } + } else { + uuid_generate(super.fsid); + } uuid_generate(super.dev_item.uuid); uuid_generate(chunk_tree_uuid); |