39  * "layer N connected" ancestor and verifying that all parents along the way are
42  * making that ancestor "layer N connected". For example:
50  * in ovl_lookup_real_ancestor() will not be able to lookup a connected overlay
51  * dentry from the connected lower dentry /a/b/c.
55  * /a/b. After copy up (and index) of /a/b, it will become "layer 2 connected"
58  * a connected overlay dentry will be accomplished.
62  * layer 1. If that improvement is made, then the check for "layer N connected"
93  * @dentry is "connected" if all ancestors up to root or a "connected" ancestor
95  * copy up a "connectable" ancestor to make it "connected". A "connected" dentry
96  * cannot become non "connected", so cache positive result in dentry flags.
98  * Return the connected origin layer or < 0 on error.
133 		/* If @parent is connected or indexed we are done */  in ovl_connect_layer()
172  * (*) Decoding a connected overlay dir from real lower dentry is not always
215 	 * ovl_connect_layer() will try to make origin's layer "connected" by  in ovl_check_encode_origin()
354  * @connected: parent overlay dentry
359  * Lookup a child overlay dentry in @connected with the same name as the @real
361  * @connected, and @real is the real dentry for the result.
364  *   %-ECHILD if the parent of @real is no longer the real dentry for @connected.
368 static struct dentry *ovl_lookup_real_one(struct dentry *connected,  in ovl_lookup_real_one()  argument
383 	this = lookup_noperm_unlocked(&name.name, connected);  in ovl_lookup_real_one()
387 	if (ovl_dentry_real_at(connected, layer->idx) != real->d_parent)  in ovl_lookup_real_one()
405 	pr_warn_ratelimited("failed to lookup one by real (%pd2, layer=%d, connected=%pd2, err=%i)\n",  in ovl_lookup_real_one()
406 			    real, layer->idx, connected, err);  in ovl_lookup_real_one()
450 	/* Get connected upper overlay dir from index */  in ovl_lookup_real_inode()
463 		 * connected/hashed upper parent (or up to root).  in ovl_lookup_real_inode()
533  * Lookup a connected overlay dentry whose real dentry is @real.
541 	struct dentry *connected;  in ovl_lookup_real()  local
544 	connected = ovl_lookup_real_ancestor(sb, real, layer);  in ovl_lookup_real()
545 	if (IS_ERR(connected))  in ovl_lookup_real()
546 		return connected;  in ovl_lookup_real()
551 		struct dentry *real_connected = ovl_dentry_real_at(connected,  in ovl_lookup_real()
557 		/* Find the topmost dentry not yet connected */  in ovl_lookup_real()
574 				dput(connected);  in ovl_lookup_real()
575 				connected = dget(sb->s_root);  in ovl_lookup_real()
595 			this = ovl_lookup_real_one(connected, next, layer);  in ovl_lookup_real()
601 			 * overlay rename of child away from 'connected' parent.  in ovl_lookup_real()
615 				dput(connected);  in ovl_lookup_real()
616 				connected = this;  in ovl_lookup_real()
627 	return connected;  in ovl_lookup_real()
630 	pr_warn_ratelimited("failed to lookup by real (%pd2, layer=%d, connected=%pd2, err=%i)\n",  in ovl_lookup_real()
631 			    real, layer->idx, connected, err);  in ovl_lookup_real()
632 	dput(connected);  in ovl_lookup_real()
660 	 * If real dentry is connected and hashed, get a connected overlay  in ovl_get_dentry()
726 	/* Then try to get a connected upper dir by index */  in ovl_lower_fh_to_d()
753 	/* Get a connected non-upper dir or disconnected non-dir */  in ovl_lower_fh_to_d()
840 	 * ovl_fh_to_dentry() returns connected dir overlay dentries and  in ovl_get_name()
850 	 * ovl_fh_to_dentry() returns connected dir overlay dentries, so we  in ovl_get_parent()