Merge tag 'fs_for_v6.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

Pull quota and udf fixes from Jan Kara:
 "Two small UDF fixes for better handling of corrupted filesystem and a
  quota fix to fix handling of filesystem freezing"

* tag 'fs_for_v6.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
  udf: Verify inode link counts before performing rename
  udf: Skip parent dir link count update if corrupted
  quota: flush quota_release_work upon quota writeback

Author: torvalds

fs/quota/dquot.c

@@ -688,6 +688,8 @@ int dquot_writeback_dquots(struct super_block *sb, int type)
 
 	WARN_ON_ONCE(!rwsem_is_locked(&sb->s_umount));
 
+	flush_delayed_work(&quota_release_work);
+
 	for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
 		if (type != -1 && cnt != type)
 			continue;

fs/udf/namei.c

@@ -517,7 +517,11 @@ static int udf_rmdir(struct inode *dir, struct dentry *dentry)
 			 inode->i_nlink);
 	clear_nlink(inode);
 	inode->i_size = 0;
-	inode_dec_link_count(dir);
+	if (dir->i_nlink >= 3)
+		inode_dec_link_count(dir);
+	else
+		udf_warn(inode->i_sb, "parent dir link count too low (%u)\n",
+			 dir->i_nlink);
 	udf_add_fid_counter(dir->i_sb, true, -1);
 	inode_set_mtime_to_ts(dir,
 			      inode_set_ctime_to_ts(dir, inode_set_ctime_current(inode)));
@@ -787,8 +791,18 @@ static int udf_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 			retval = -ENOTEMPTY;
 			if (!empty_dir(new_inode))
 				goto out_oiter;
+			retval = -EFSCORRUPTED;
+			if (new_inode->i_nlink != 2)
+				goto out_oiter;
 		}
+		retval = -EFSCORRUPTED;
+		if (old_dir->i_nlink < 3)
+			goto out_oiter;
 		is_dir = true;
+	} else if (new_inode) {
+		retval = -EFSCORRUPTED;
+		if (new_inode->i_nlink < 1)
+			goto out_oiter;
 	}
 	if (is_dir && old_dir != new_dir) {
 		retval = udf_fiiter_find_entry(old_inode, &dotdot_name,