ovl: fix spelling mistakes

fix follow spelling misktakes:
	decendant  ==> descendant
	indentify  ==> identify
	underlaying ==> underlying

Reported-by: Hacash Robot <hacashRobot@santino.com>
Signed-off-by: William Dean <williamsukatube@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

fs/overlayfs/namei.c

@@ -42,7 +42,7 @@ static int ovl_check_redirect(struct path *path, struct ovl_lookup_data *d,
 		 * One of the ancestor path elements in an absolute path
 		 * lookup in ovl_lookup_layer() could have been opaque and
 		 * that will stop further lookup in lower layers (d->stop=true)
-		 * But we have found an absolute redirect in decendant path
+		 * But we have found an absolute redirect in descendant path
 		 * element and that should force continue lookup in lower
 		 * layers (reset d->stop).
 		 */
@@ -648,7 +648,7 @@ static int ovl_get_index_name_fh(struct ovl_fh *fh, struct qstr *name)
  * If the index dentry for a copy up origin inode is positive, but points
  * to an inode different than the upper inode, then either the upper inode
  * has been copied up and not indexed or it was indexed, but since then
- * index dir was cleared. Either way, that index cannot be used to indentify
+ * index dir was cleared. Either way, that index cannot be used to identify
  * the overlay inode.
  */
 int ovl_get_index_name(struct ovl_fs *ofs, struct dentry *origin,

fs/overlayfs/super.c

@@ -2057,7 +2057,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
 	sb->s_stack_depth = 0;
 	sb->s_maxbytes = MAX_LFS_FILESIZE;
 	atomic_long_set(&ofs->last_ino, 1);
-	/* Assume underlaying fs uses 32bit inodes unless proven otherwise */
+	/* Assume underlying fs uses 32bit inodes unless proven otherwise */
 	if (ofs->config.xino != OVL_XINO_OFF) {
 		ofs->xino_mode = BITS_PER_LONG - 32;
 		if (!ofs->xino_mode) {