117 		 * (upper fsid is 0). The lowest xinobit is reserved for mapping  in ovl_map_dev_ino()
205 			 * upper files, so we cannot use the lower origin st_ino  in ovl_getattr()
215 			 * upper hardlink is not broken and that a redirected  in ovl_getattr()
242 			 * no origin on upper, we can end up here.  in ovl_getattr()
274 	 * Return the overlay inode nlinks for indexed upper inodes.  in ovl_getattr()
275 	 * Overlay inode nlink counts the union of the upper hardlinks  in ovl_getattr()
276 	 * and non-covered lower hardlinks. It does not include the upper  in ovl_getattr()
671 		 * in upper fileattr (in case they were set by older kernel)  in ovl_fileattr_set()
812  * upper fs:
875 	 * To avoid ino collision with legitimate xino values from upper  in ovl_map_ino()
939  * With inodes index enabled, an overlay inode nlink counts the union of upper
941  * upper inode, the following nlink modifying operations can happen:
944  * 2. Upper hardlink created, unlinked or renamed over
948  * operation succeeds or fails, but the upper inode nlink may change.
952  * For the second, upper hardlink case, the union nlink should be incremented
954  * upper inode. Therefore, before link/unlink/rename, we store the union nlink
955  * value relative to the upper inode nlink in the index inode.
959  * upper inode where the nlink xattr can be stored before the copied up upper
967  * nlink relative to the upper inode - "U[+-]NUM"
1066 	 * checks, so NULL lower/upper in dentry must match NULL lower/upper in  in ovl_verify_inode()
1068 	 * 'unknown' lower/upper.  in ovl_verify_inode()
1071 		/* Real lower dir moved to upper layer under us? */  in ovl_verify_inode()
1168 static bool ovl_hash_bylower(struct super_block *sb, struct dentry *upper,  in ovl_hash_bylower()  argument
1173 	/* No, if pure upper */  in ovl_hash_bylower()
1186 	if ((upper || !ovl_indexdir(sb)) &&  in ovl_hash_bylower()
1190 	/* No, if non-indexed upper with NFS export */  in ovl_hash_bylower()
1191 	if (ofs->config.nfs_export && upper)  in ovl_hash_bylower()
1231 	 * Copy up origin (lower) may exist for non-indexed upper, but we must  in ovl_get_inode()