19 static int ovl_encode_maybe_copy_up(struct dentry *dentry)  in ovl_encode_maybe_copy_up()  argument
23 	if (ovl_dentry_upper(dentry))  in ovl_encode_maybe_copy_up()
26 	err = ovl_want_write(dentry);  in ovl_encode_maybe_copy_up()
28 		err = ovl_copy_up(dentry);  in ovl_encode_maybe_copy_up()
29 		ovl_drop_write(dentry);  in ovl_encode_maybe_copy_up()
34 				    dentry, err);  in ovl_encode_maybe_copy_up()
77 static int ovl_connectable_layer(struct dentry *dentry)  in ovl_connectable_layer()  argument
79 	struct ovl_entry *oe = OVL_E(dentry);  in ovl_connectable_layer()
82 	if (dentry == dentry->d_sb->s_root)  in ovl_connectable_layer()
89 	if (ovl_dentry_upper(dentry) &&  in ovl_connectable_layer()
90 	    !ovl_test_flag(OVL_INDEX, d_inode(dentry)))  in ovl_connectable_layer()
105 static int ovl_connect_layer(struct dentry *dentry)  in ovl_connect_layer()  argument
107 	struct dentry *next, *parent = NULL;  in ovl_connect_layer()
108 	struct ovl_entry *oe = OVL_E(dentry);  in ovl_connect_layer()
112 	if (WARN_ON(dentry == dentry->d_sb->s_root) ||  in ovl_connect_layer()
113 	    WARN_ON(!ovl_dentry_lower(dentry)))  in ovl_connect_layer()
117 	if (ovl_dentry_test_flag(OVL_E_CONNECTED, dentry))  in ovl_connect_layer()
121 	next = dget(dentry);  in ovl_connect_layer()
151 		ovl_dentry_set_flag(OVL_E_CONNECTED, dentry);  in ovl_connect_layer()
184 static int ovl_check_encode_origin(struct dentry *dentry)  in ovl_check_encode_origin()  argument
186 	struct ovl_fs *ofs = OVL_FS(dentry->d_sb);  in ovl_check_encode_origin()
190 	if (!ovl_dentry_upper(dentry) && !decodable)  in ovl_check_encode_origin()
194 	if (!ovl_dentry_lower(dentry))  in ovl_check_encode_origin()
201 	if (dentry == dentry->d_sb->s_root)  in ovl_check_encode_origin()
207 	if (ovl_dentry_upper(dentry) && decodable &&  in ovl_check_encode_origin()
208 	    !ovl_test_flag(OVL_INDEX, d_inode(dentry)))  in ovl_check_encode_origin()
217 	if (d_is_dir(dentry) && ovl_upper_mnt(ofs) && decodable)  in ovl_check_encode_origin()
218 		return ovl_connect_layer(dentry);  in ovl_check_encode_origin()
224 static int ovl_dentry_to_fid(struct ovl_fs *ofs, struct dentry *dentry,  in ovl_dentry_to_fid()  argument
235 	err = enc_lower = ovl_check_encode_origin(dentry);  in ovl_dentry_to_fid()
240 	fh = ovl_encode_real_fh(ofs, enc_lower ? ovl_dentry_lower(dentry) :  in ovl_dentry_to_fid()
241 				ovl_dentry_upper(dentry), !enc_lower);  in ovl_dentry_to_fid()
256 			    dentry, err);  in ovl_dentry_to_fid()
264 	struct dentry *dentry;  in ovl_encode_fh()  local
271 	dentry = d_find_any_alias(inode);  in ovl_encode_fh()
272 	if (!dentry)  in ovl_encode_fh()
275 	bytes = ovl_dentry_to_fid(ofs, dentry, fid, buflen);  in ovl_encode_fh()
276 	dput(dentry);  in ovl_encode_fh()
290 static struct dentry *ovl_obtain_alias(struct super_block *sb,  in ovl_obtain_alias()
291 				       struct dentry *upper_alias,  in ovl_obtain_alias()
293 				       struct dentry *index)  in ovl_obtain_alias()
295 	struct dentry *lower = lowerpath ? lowerpath->dentry : NULL;  in ovl_obtain_alias()
296 	struct dentry *upper = upper_alias ?: index;  in ovl_obtain_alias()
297 	struct dentry *dentry;  in ovl_obtain_alias()  local
314 		ovl_lowerstack(oe)->dentry = dget(lower);  in ovl_obtain_alias()
328 	dentry = d_find_any_alias(inode);  in ovl_obtain_alias()
329 	if (dentry)  in ovl_obtain_alias()
332 	dentry = d_alloc_anon(inode->i_sb);  in ovl_obtain_alias()
333 	if (unlikely(!dentry))  in ovl_obtain_alias()
337 		ovl_dentry_set_upper_alias(dentry);  in ovl_obtain_alias()
339 	ovl_dentry_init_reval(dentry, upper, OVL_I_E(inode));  in ovl_obtain_alias()
341 	return d_instantiate_anon(dentry, inode);  in ovl_obtain_alias()
344 	dput(dentry);  in ovl_obtain_alias()
345 	dentry = ERR_PTR(-ENOMEM);  in ovl_obtain_alias()
348 	return dentry;  in ovl_obtain_alias()
352 static struct dentry *ovl_dentry_real_at(struct dentry *dentry, int idx)  in ovl_dentry_real_at()  argument
354 	struct ovl_entry *oe = OVL_E(dentry);  in ovl_dentry_real_at()
359 		return ovl_dentry_upper(dentry);  in ovl_dentry_real_at()
363 			return lowerstack[i].dentry;  in ovl_dentry_real_at()
375 static struct dentry *ovl_lookup_real_one(struct dentry *connected,  in ovl_lookup_real_one()
376 					  struct dentry *real,  in ovl_lookup_real_one()
380 	struct dentry *this, *parent = NULL;  in ovl_lookup_real_one()
436 static struct dentry *ovl_lookup_real(struct super_block *sb,
437 				      struct dentry *real,
443 static struct dentry *ovl_lookup_real_inode(struct super_block *sb,  in ovl_lookup_real_inode()
444 					    struct dentry *real,  in ovl_lookup_real_inode()
448 	struct dentry *index = NULL;  in ovl_lookup_real_inode()
449 	struct dentry *this = NULL;  in ovl_lookup_real_inode()
476 		struct dentry *upper = ovl_index_upper(ofs, index, true);  in ovl_lookup_real_inode()
508 static struct dentry *ovl_lookup_real_ancestor(struct super_block *sb,  in ovl_lookup_real_ancestor()
509 					       struct dentry *real,  in ovl_lookup_real_ancestor()
512 	struct dentry *next, *parent = NULL;  in ovl_lookup_real_ancestor()
513 	struct dentry *ancestor = ERR_PTR(-EIO);  in ovl_lookup_real_ancestor()
561 static struct dentry *ovl_lookup_real(struct super_block *sb,  in ovl_lookup_real()
562 				      struct dentry *real,  in ovl_lookup_real()
565 	struct dentry *connected;  in ovl_lookup_real()
573 		struct dentry *next, *this;  in ovl_lookup_real()
574 		struct dentry *parent = NULL;  in ovl_lookup_real()
575 		struct dentry *real_connected = ovl_dentry_real_at(connected,  in ovl_lookup_real()
663 static struct dentry *ovl_get_dentry(struct super_block *sb,  in ovl_get_dentry()
664 				     struct dentry *upper,  in ovl_get_dentry()
666 				     struct dentry *index)  in ovl_get_dentry()
670 	struct dentry *real = upper ?: (index ?: lowerpath->dentry);  in ovl_get_dentry()
690 static struct dentry *ovl_upper_fh_to_d(struct super_block *sb,  in ovl_upper_fh_to_d()
694 	struct dentry *dentry;  in ovl_upper_fh_to_d()  local
695 	struct dentry *upper;  in ovl_upper_fh_to_d()
704 	dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_upper_fh_to_d()
707 	return dentry;  in ovl_upper_fh_to_d()
710 static struct dentry *ovl_lower_fh_to_d(struct super_block *sb,  in ovl_lower_fh_to_d()
716 	struct dentry *dentry = NULL;  in ovl_lower_fh_to_d()  local
717 	struct dentry *index = NULL;  in ovl_lower_fh_to_d()
726 	if (!d_is_dir(origin.dentry) ||  in ovl_lower_fh_to_d()
727 	    !(origin.dentry->d_flags & DCACHE_DISCONNECTED)) {  in ovl_lower_fh_to_d()
728 		inode = ovl_lookup_inode(sb, origin.dentry, false);  in ovl_lower_fh_to_d()
733 			dentry = d_find_any_alias(inode);  in ovl_lower_fh_to_d()
735 			if (dentry)  in ovl_lower_fh_to_d()
752 		struct dentry *upper = ovl_index_upper(ofs, index, true);  in ovl_lower_fh_to_d()
758 		dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_lower_fh_to_d()
764 	if (d_is_dir(origin.dentry)) {  in ovl_lower_fh_to_d()
765 		dput(origin.dentry);  in ovl_lower_fh_to_d()
766 		origin.dentry = NULL;  in ovl_lower_fh_to_d()
772 		err = ovl_verify_origin(ofs, index, origin.dentry, false);  in ovl_lower_fh_to_d()
778 	dentry = ovl_get_dentry(sb, NULL, &origin, index);  in ovl_lower_fh_to_d()
781 	dput(origin.dentry);  in ovl_lower_fh_to_d()
783 	return dentry;  in ovl_lower_fh_to_d()
786 	dentry = ERR_PTR(err);  in ovl_lower_fh_to_d()
813 static struct dentry *ovl_fh_to_dentry(struct super_block *sb, struct fid *fid,  in ovl_fh_to_dentry()
816 	struct dentry *dentry = NULL;  in ovl_fh_to_dentry()  local
832 	dentry = (flags & OVL_FH_FLAG_PATH_UPPER) ?  in ovl_fh_to_dentry()
835 	err = PTR_ERR(dentry);  in ovl_fh_to_dentry()
836 	if (IS_ERR(dentry) && err != -ESTALE)  in ovl_fh_to_dentry()
844 	return dentry;  in ovl_fh_to_dentry()
849 	dentry = ERR_PTR(err);  in ovl_fh_to_dentry()
853 static struct dentry *ovl_fh_to_parent(struct super_block *sb, struct fid *fid,  in ovl_fh_to_parent()
860 static int ovl_get_name(struct dentry *parent, char *name,  in ovl_get_name()
861 			struct dentry *child)  in ovl_get_name()
871 static struct dentry *ovl_get_parent(struct dentry *dentry)  in ovl_get_parent()  argument