btrfs-progs: docs: fix typo

Documentation/mkfs.btrfs.rst

@@ -58,7 +58,7 @@ OPTIONS
 
         Default on a single device filesystem is *DUP* and is recommended for metadata
         in general. The duplication might not be necessary in some use cases and it's
-        up to the user to changed that at mkfs time or later. This depends on hardware
+        up to the user to change that at mkfs time or later. This depends on hardware
         that could potentially deduplicate the blocks again but this cannot be detected
         at mkfs time.
 

check/main.c

@@ -3550,6 +3550,11 @@ static int check_root_refs(struct btrfs_root *root,
 				 */
 				if (!rec->found_root_item)
 					continue;
+				if (opt_check_repair) {
+					ret = repair_subvol_orphan_item(gfs_info, rec->objectid);
+					if (!ret)
+						continue;
+				}
 				errors++;
 				fprintf(stderr, "fs tree %llu missing orphan item\n", rec->objectid);
 			}

check/mode-common.c

@@ -1672,3 +1672,36 @@ int check_and_repair_super_num_devs(struct btrfs_fs_info *fs_info)
 	printf("Successfully reset super num devices to %u\n", found_devs);
 	return 0;
 }
+
+int repair_subvol_orphan_item(struct btrfs_fs_info *fs_info, u64 rootid)
+{
+	struct btrfs_root *tree_root = fs_info->tree_root;
+	struct btrfs_trans_handle *trans;
+	struct btrfs_path path = { 0 };
+	int ret;
+
+	trans = btrfs_start_transaction(tree_root, 1);
+	if (IS_ERR(trans)) {
+		ret = PTR_ERR(trans);
+		errno = -ret;
+		error_msg(ERROR_MSG_START_TRANS, "%m");
+		return ret;
+	}
+	ret = btrfs_add_orphan_item(trans, tree_root, &path, rootid);
+	btrfs_release_path(&path);
+	if (ret < 0) {
+		errno = -ret;
+		error("failed to insert orphan item for subvolume %llu: %m", rootid);
+		btrfs_abort_transaction(trans, ret);
+		btrfs_commit_transaction(trans, tree_root);
+		return ret;
+	}
+	ret = btrfs_commit_transaction(trans, tree_root);
+	if (ret < 0) {
+		errno = -ret;
+		error_msg(ERROR_MSG_COMMIT_TRANS, "%m");
+		return ret;
+	}
+	printf("Added back missing orphan item for subvolume %llu\n", rootid);
+	return 0;
+}

check/mode-common.h

@@ -197,5 +197,6 @@ int repair_dev_item_bytes_used(struct btrfs_fs_info *fs_info,
 int fill_csum_tree(struct btrfs_trans_handle *trans, bool search_fs_tree);
 
 int check_and_repair_super_num_devs(struct btrfs_fs_info *fs_info);
+int repair_subvol_orphan_item(struct btrfs_fs_info *fs_info, u64 rootid);
 
 #endif

check/mode-lowmem.c

@@ -5569,9 +5569,16 @@ static int check_btrfs_root(struct btrfs_root *root, int check_all)
 	 * If this tree is a subvolume (not a reloc tree) and has no refs, there
 	 * should be an orphan item for it, or this subvolume will never be deleted.
 	 */
-	if (btrfs_root_refs(root_item) == 0 && is_fstree(btrfs_root_id(root))) {
-		if (!has_orphan_item(root->fs_info->tree_root,
-				     btrfs_root_id(root))) {
+	if (btrfs_root_refs(root_item) == 0 && is_fstree(btrfs_root_id(root)) &&
+	    !has_orphan_item(root->fs_info->tree_root, btrfs_root_id(root))) {
+		bool repaired = false;
+
+		if (opt_check_repair) {
+			ret = repair_subvol_orphan_item(root->fs_info, btrfs_root_id(root));
+			if (!ret)
+				repaired = true;
+		}
+		if (!repaired) {
 			error("missing orphan item for root %lld", btrfs_root_id(root));
 			err |= REFERENCER_MISSING;
 		}