44  * "layer N connected" ancestor and verifying that all parents along the way are
47  * making that ancestor "layer N connected". For example:
55  * in ovl_lookup_real_ancestor() will not be able to lookup a connected overlay
56  * dentry from the connected lower dentry /a/b/c.
60  * /a/b. After copy up (and index) of /a/b, it will become "layer 2 connected"
63  * a connected overlay dentry will be accomplished.
67  * layer 1. If that improvement is made, then the check for "layer N connected"
98  * @dentry is "connected" if all ancestors up to root or a "connected" ancestor
100  * copy up a "connectable" ancestor to make it "connected". A "connected" dentry
101  * cannot become non "connected", so cache positive result in dentry flags.
103  * Return the connected origin layer or < 0 on error.
137 		/* If @parent is connected or indexed we are done */  in ovl_connect_layer()
204 	 * ovl_connect_layer() will try to make origin's layer "connected" by  in ovl_check_encode_origin()
363  * Lookup a child overlay dentry to get a connected overlay dentry whose real
368 static struct dentry *ovl_lookup_real_one(struct dentry *connected,  in ovl_lookup_real_one()  argument
372 	struct inode *dir = d_inode(connected);  in ovl_lookup_real_one()
381 	 * connected overlay dir, we return -ECHILD and restart the lookup of  in ovl_lookup_real_one()
382 	 * connected real path from the top.  in ovl_lookup_real_one()
387 	if (ovl_dentry_real_at(connected, layer->idx) != parent)  in ovl_lookup_real_one()
397 	this = lookup_one_len(name.name.name, connected, name.name.len);  in ovl_lookup_real_one()
418 …pr_warn_ratelimited("overlayfs: failed to lookup one by real (%pd2, layer=%d, connected=%pd2, err=…  in ovl_lookup_real_one()
419 			    real, layer->idx, connected, err);  in ovl_lookup_real_one()
463 	/* Get connected upper overlay dir from index */  in ovl_lookup_real_inode()
476 		 * connected/hashed upper parent (or up to root).  in ovl_lookup_real_inode()
546  * Lookup a connected overlay dentry whose real dentry is @real.
554 	struct dentry *connected;  in ovl_lookup_real()  local
557 	connected = ovl_lookup_real_ancestor(sb, real, layer);  in ovl_lookup_real()
558 	if (IS_ERR(connected))  in ovl_lookup_real()
559 		return connected;  in ovl_lookup_real()
564 		struct dentry *real_connected = ovl_dentry_real_at(connected,  in ovl_lookup_real()
570 		/* Find the topmost dentry not yet connected */  in ovl_lookup_real()
587 				dput(connected);  in ovl_lookup_real()
588 				connected = dget(sb->s_root);  in ovl_lookup_real()
608 			this = ovl_lookup_real_one(connected, next, layer);  in ovl_lookup_real()
614 			 * overlay rename of child away from 'connected' parent.  in ovl_lookup_real()
628 				dput(connected);  in ovl_lookup_real()
629 				connected = this;  in ovl_lookup_real()
640 	return connected;  in ovl_lookup_real()
643 …pr_warn_ratelimited("overlayfs: failed to lookup by real (%pd2, layer=%d, connected=%pd2, err=%i)\…  in ovl_lookup_real()
644 			    real, layer->idx, connected, err);  in ovl_lookup_real()
645 	dput(connected);  in ovl_lookup_real()
674 	 * If real dentry is connected and hashed, get a connected overlay  in ovl_get_dentry()
740 	/* Then try to get a connected upper dir by index */  in ovl_lower_fh_to_d()
767 	/* Get a connected non-upper dir or disconnected non-dir */  in ovl_lower_fh_to_d()
824 	 * ovl_fh_to_dentry() returns connected dir overlay dentries and  in ovl_get_name()
834 	 * ovl_fh_to_dentry() returns connected dir overlay dentries, so we  in ovl_get_parent()