101 		 * (upper fsid is 0). This way overlay inode numbers are unique  in ovl_map_dev_ino()
134 		 * is unique per lower fs. Upper layer uses real st_dev and  in ovl_map_dev_ino()
190 			 * upper files, so we cannot use the lower origin st_ino  in ovl_getattr()
200 			 * upper hardlink is not broken and that a redirected  in ovl_getattr()
233 			 * no origin on upper, we can end up here.  in ovl_getattr()
260 	 * Return the overlay inode nlinks for indexed upper inodes.  in ovl_getattr()
261 	 * Overlay inode nlink counts the union of the upper hardlinks  in ovl_getattr()
262 	 * and non-covered lower hardlinks. It does not include the upper  in ovl_getattr()
569 	 * upper inode i_ino on ovl_inode_init() or ovl_inode_update().  in ovl_fill_inode()
610  * With inodes index enabled, an overlay inode nlink counts the union of upper
612  * upper inode, the following nlink modifying operations can happen:
615  * 2. Upper hardlink created, unlinked or renamed over
619  * operation succeeds or fails, but the upper inode nlink may change.
623  * For the second, upper hardlink case, the union nlink should be incremented
625  * upper inode. Therefore, before link/unlink/rename, we store the union nlink
626  * value relative to the upper inode nlink in the index inode.
630  * upper inode where the nlink xattr can be stored before the copied up upper
638  * nlink relative to the upper inode - "U[+-]NUM"
736 	 * checks, so NULL lower/upper in dentry must match NULL lower/upper in  in ovl_verify_inode()
738 	 * 'unknown' lower/upper.  in ovl_verify_inode()
741 		/* Real lower dir moved to upper layer under us? */  in ovl_verify_inode()
838 static bool ovl_hash_bylower(struct super_block *sb, struct dentry *upper,  in ovl_hash_bylower()  argument
843 	/* No, if pure upper */  in ovl_hash_bylower()
856 	if ((upper || !ovl_indexdir(sb)) &&  in ovl_hash_bylower()
860 	/* No, if non-indexed upper with NFS export */  in ovl_hash_bylower()
861 	if (sb->s_export_op && upper)  in ovl_hash_bylower()
896 	 * Copy up origin (lower) may exist for non-indexed upper, but we must  in ovl_get_inode()