This function will change all dev items' fsid.
Signed-off-by: Qu Wenruo <quwenruo@xxxxxxxxxxxxxx>
---
btrfstune.c | 43 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 43 insertions(+)
diff --git a/btrfstune.c b/btrfstune.c
index 6706cd7..8a5b3c2 100644
--- a/btrfstune.c
+++ b/btrfstune.c
@@ -219,6 +219,49 @@ static int change_device_uuid(struct btrfs_root *root, struct extent_buffer *eb,
return ret;
}
+static int change_devices_uuid(struct btrfs_fs_info *fs_info)
+{
+ struct btrfs_root *root = fs_info->chunk_root;
+ struct btrfs_path *path;
+ struct btrfs_key key = {0, 0, 0};
+ int ret = 0;
+
+ /*
+ * Unlike change_extents_uuid, we only need to change fsid in dev_item
+ */
+ if (!fs_info->new_fsid)
+ return 0;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+ /* No transaction again */
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0)
+ goto out;
+
+ while (1) {
+ btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]);
+ if (key.type != BTRFS_DEV_ITEM_KEY ||
+ key.objectid != BTRFS_DEV_ITEMS_OBJECTID)
+ goto next;
+ ret = change_device_uuid(root, path->nodes[0], path->slots[0]);
+ if (ret < 0)
+ goto out;
+next:
+ ret = btrfs_next_item(root, path);
+ if (ret < 0)
+ goto out;
+ if (ret > 0) {
+ ret = 0;
+ goto out;
+ }
+ }
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
static void print_usage(void)
{
fprintf(stderr, "usage: btrfstune [options] device\n");
--
2.3.7
--
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