corrected the comments

src/cow.c

@@ -157,7 +157,7 @@ static int copy_file_locked(struct cow *cow, const char *path,
 
 	res = copy_file(cow);
 out:
-	/* unlock copy-ip metadata */
+	/* unlock copy-up metadata */
 	unlock_file_copyup(path, branch_rw, lockfd);
 	RETURN(res);
 }

src/general.c

@@ -231,9 +231,8 @@ static int build_copyup_path(const char *path, int branch_rw,
 }
 
 /**
- * Creates copy-up meta file to indicate ongoing copy-up.
- * It also locks the metafile. Lock is meant for blocking
- * competing processes to block copy-up.
+ * Creates copy-up meta file to indicate ongoing copy-up. It also locks the
+ * metafile. Lock is meant for blocking competing processes trying to copy-up.
  * @return locked file descriptor.
  */
 int lock_file_copyup(const char *path, int branch_rw) {
@@ -261,7 +260,8 @@ int lock_file_copyup(const char *path, int branch_rw) {
 
 /**
  * Removes copy-up meta file to indicate copy-up is complete.
- * Also unlocks the copy-up meta file.
+ * Also unlocks the copy-up meta file to unlock other competing
+ * processes.
  */
 int unlock_file_copyup(const char *path, int branch_rw, int lockfd) {
 	DBG("%s\n", path);