184 	 * If lower filesystem supports NFS file handles, this also guaranties  in ovl_getattr()
202 			 * Lower hardlinks may be broken on copy up to different  in ovl_getattr()
203 			 * upper files, so we cannot use the lower origin st_ino  in ovl_getattr()
207 			 * same dir on a lower layer. With the "verify_lower"  in ovl_getattr()
208 			 * feature, we do not use the lower origin st_ino, if  in ovl_getattr()
224 			 * If we are querying a metacopy dentry and lower  in ovl_getattr()
227 			 * vfs_getattr(). If lower itself is metacopy, then  in ovl_getattr()
239 			 * If lower is not same as lowerdata or if there was  in ovl_getattr()
267 	 * and non-covered lower hardlinks. It does not include the upper  in ovl_getattr()
460  * of the POSIX ACLs retrieved from the lower layer to this function to not
493  * alter the cached values filesystem wide for the lower filesystem. Instead we
645 		 * so children of "ovl-immutable" directories lower aliases of  in ovl_fileattr_set()
755  * overlayfs instance as lower layer. We need to annotate the
915  * hardlinks and non-covered lower hardlinks. During the lifetime of a non-pure
918  * 1. Lower hardlink copy up
920  * 3. Lower hardlink whiteout or renamed over
925  * lower inode nlink in the index inode xattr .overlay.nlink.
932  * For the last, lower cover up case, we simplify things by preceding the
943  * nlink relative to the lower inode - "L[+-]NUM"
1041 	 * checks, so NULL lower/upper in dentry must match NULL lower/upper in  in ovl_verify_inode()
1043 	 * 'unknown' lower/upper.  in ovl_verify_inode()
1046 		/* Real lower dir moved to upper layer under us? */  in ovl_verify_inode()
1056 	 * Allow non-NULL lower inode in ovl_inode even if lowerdentry is NULL.  in ovl_verify_inode()
1058 	 * or hardlinked overlay dentry and lower dentry cannot be followed  in ovl_verify_inode()
1059 	 * by origin because lower fs does not support file handles.  in ovl_verify_inode()
1066 	 * This happens when finding a lower alias for a copied up hard link.  in ovl_verify_inode()
1141  * Does overlay inode need to be hashed by lower inode?
1144 			     struct dentry *lower, bool index)  in ovl_hash_bylower()  argument
1149 	if (!lower)  in ovl_hash_bylower()
1160 	/* No, if lower hardlink is or will be broken on copy up */  in ovl_hash_bylower()
1162 	    !d_is_dir(lower) && d_inode(lower)->i_nlink > 1)  in ovl_hash_bylower()
1169 	/* Otherwise, hash by lower inode for fsnotify */  in ovl_hash_bylower()
1206 	 * Copy up origin (lower) may exist for non-indexed upper, but we must  in ovl_get_inode()
1207 	 * not use lower as hash key if this is a broken hardlink.  in ovl_get_inode()
1242 		/* Lower hardlink that will be broken on copy up */  in ovl_get_inode()