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()
111 	if (WARN_ON(dentry == dentry->d_sb->s_root) ||  in ovl_connect_layer()
112 	    WARN_ON(!ovl_dentry_lower(dentry)))  in ovl_connect_layer()
115 	origin_layer = OVL_E(dentry)->lowerstack[0].layer->idx;  in ovl_connect_layer()
116 	if (ovl_dentry_test_flag(OVL_E_CONNECTED, dentry))  in ovl_connect_layer()
120 	next = dget(dentry);  in ovl_connect_layer()
150 		ovl_dentry_set_flag(OVL_E_CONNECTED, dentry);  in ovl_connect_layer()
183 static int ovl_check_encode_origin(struct dentry *dentry)  in ovl_check_encode_origin()  argument
185 	struct ovl_fs *ofs = dentry->d_sb->s_fs_info;  in ovl_check_encode_origin()
188 	if (!ovl_dentry_lower(dentry))  in ovl_check_encode_origin()
197 	if (ovl_dentry_upper(dentry) &&  in ovl_check_encode_origin()
198 	    !ovl_test_flag(OVL_INDEX, d_inode(dentry)))  in ovl_check_encode_origin()
207 	if (d_is_dir(dentry) && ovl_upper_mnt(ofs))  in ovl_check_encode_origin()
208 		return ovl_connect_layer(dentry);  in ovl_check_encode_origin()
214 static int ovl_dentry_to_fid(struct ovl_fs *ofs, struct dentry *dentry,  in ovl_dentry_to_fid()  argument
225 	err = enc_lower = ovl_check_encode_origin(dentry);  in ovl_dentry_to_fid()
230 	fh = ovl_encode_real_fh(ofs, enc_lower ? ovl_dentry_lower(dentry) :  in ovl_dentry_to_fid()
231 				ovl_dentry_upper(dentry), !enc_lower);  in ovl_dentry_to_fid()
246 			    dentry, err);  in ovl_dentry_to_fid()
254 	struct dentry *dentry;  in ovl_encode_fh()  local
261 	dentry = d_find_any_alias(inode);  in ovl_encode_fh()
262 	if (WARN_ON(!dentry))  in ovl_encode_fh()
265 	bytes = ovl_dentry_to_fid(ofs, dentry, fid, buflen);  in ovl_encode_fh()
266 	dput(dentry);  in ovl_encode_fh()
280 static struct dentry *ovl_obtain_alias(struct super_block *sb,  in ovl_obtain_alias()
281 				       struct dentry *upper_alias,  in ovl_obtain_alias()
283 				       struct dentry *index)  in ovl_obtain_alias()
285 	struct dentry *lower = lowerpath ? lowerpath->dentry : NULL;  in ovl_obtain_alias()
286 	struct dentry *upper = upper_alias ?: index;  in ovl_obtain_alias()
287 	struct dentry *dentry;  in ovl_obtain_alias()  local
310 	dentry = d_find_any_alias(inode);  in ovl_obtain_alias()
311 	if (dentry)  in ovl_obtain_alias()
314 	dentry = d_alloc_anon(inode->i_sb);  in ovl_obtain_alias()
315 	if (unlikely(!dentry))  in ovl_obtain_alias()
322 		oe->lowerstack->dentry = dget(lower);  in ovl_obtain_alias()
325 	dentry->d_fsdata = oe;  in ovl_obtain_alias()
327 		ovl_dentry_set_upper_alias(dentry);  in ovl_obtain_alias()
329 	ovl_dentry_update_reval(dentry, upper,  in ovl_obtain_alias()
332 	return d_instantiate_anon(dentry, inode);  in ovl_obtain_alias()
335 	dput(dentry);  in ovl_obtain_alias()
336 	dentry = ERR_PTR(-ENOMEM);  in ovl_obtain_alias()
339 	return dentry;  in ovl_obtain_alias()
343 static struct dentry *ovl_dentry_real_at(struct dentry *dentry, int idx)  in ovl_dentry_real_at()  argument
345 	struct ovl_entry *oe = dentry->d_fsdata;  in ovl_dentry_real_at()
349 		return ovl_dentry_upper(dentry);  in ovl_dentry_real_at()
353 			return oe->lowerstack[i].dentry;  in ovl_dentry_real_at()
365 static struct dentry *ovl_lookup_real_one(struct dentry *connected,  in ovl_lookup_real_one()
366 					  struct dentry *real,  in ovl_lookup_real_one()
370 	struct dentry *this, *parent = NULL;  in ovl_lookup_real_one()
421 static struct dentry *ovl_lookup_real(struct super_block *sb,
422 				      struct dentry *real,
428 static struct dentry *ovl_lookup_real_inode(struct super_block *sb,  in ovl_lookup_real_inode()
429 					    struct dentry *real,  in ovl_lookup_real_inode()
433 	struct dentry *index = NULL;  in ovl_lookup_real_inode()
434 	struct dentry *this = NULL;  in ovl_lookup_real_inode()
461 		struct dentry *upper = ovl_index_upper(ofs, index);  in ovl_lookup_real_inode()
493 static struct dentry *ovl_lookup_real_ancestor(struct super_block *sb,  in ovl_lookup_real_ancestor()
494 					       struct dentry *real,  in ovl_lookup_real_ancestor()
497 	struct dentry *next, *parent = NULL;  in ovl_lookup_real_ancestor()
498 	struct dentry *ancestor = ERR_PTR(-EIO);  in ovl_lookup_real_ancestor()
546 static struct dentry *ovl_lookup_real(struct super_block *sb,  in ovl_lookup_real()
547 				      struct dentry *real,  in ovl_lookup_real()
550 	struct dentry *connected;  in ovl_lookup_real()
558 		struct dentry *next, *this;  in ovl_lookup_real()
559 		struct dentry *parent = NULL;  in ovl_lookup_real()
560 		struct dentry *real_connected = ovl_dentry_real_at(connected,  in ovl_lookup_real()
648 static struct dentry *ovl_get_dentry(struct super_block *sb,  in ovl_get_dentry()
649 				     struct dentry *upper,  in ovl_get_dentry()
651 				     struct dentry *index)  in ovl_get_dentry()
655 	struct dentry *real = upper ?: (index ?: lowerpath->dentry);  in ovl_get_dentry()
675 static struct dentry *ovl_upper_fh_to_d(struct super_block *sb,  in ovl_upper_fh_to_d()
679 	struct dentry *dentry;  in ovl_upper_fh_to_d()  local
680 	struct dentry *upper;  in ovl_upper_fh_to_d()
689 	dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_upper_fh_to_d()
692 	return dentry;  in ovl_upper_fh_to_d()
695 static struct dentry *ovl_lower_fh_to_d(struct super_block *sb,  in ovl_lower_fh_to_d()
701 	struct dentry *dentry = NULL;  in ovl_lower_fh_to_d()  local
702 	struct dentry *index = NULL;  in ovl_lower_fh_to_d()
711 	if (!d_is_dir(origin.dentry) ||  in ovl_lower_fh_to_d()
712 	    !(origin.dentry->d_flags & DCACHE_DISCONNECTED)) {  in ovl_lower_fh_to_d()
713 		inode = ovl_lookup_inode(sb, origin.dentry, false);  in ovl_lower_fh_to_d()
718 			dentry = d_find_any_alias(inode);  in ovl_lower_fh_to_d()
720 			if (dentry)  in ovl_lower_fh_to_d()
737 		struct dentry *upper = ovl_index_upper(ofs, index);  in ovl_lower_fh_to_d()
743 		dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_lower_fh_to_d()
749 	if (d_is_dir(origin.dentry)) {  in ovl_lower_fh_to_d()
750 		dput(origin.dentry);  in ovl_lower_fh_to_d()
751 		origin.dentry = NULL;  in ovl_lower_fh_to_d()
757 		err = ovl_verify_origin(ofs, index, origin.dentry, false);  in ovl_lower_fh_to_d()
763 	dentry = ovl_get_dentry(sb, NULL, &origin, index);  in ovl_lower_fh_to_d()
766 	dput(origin.dentry);  in ovl_lower_fh_to_d()
768 	return dentry;  in ovl_lower_fh_to_d()
771 	dentry = ERR_PTR(err);  in ovl_lower_fh_to_d()
798 static struct dentry *ovl_fh_to_dentry(struct super_block *sb, struct fid *fid,  in ovl_fh_to_dentry()
801 	struct dentry *dentry = NULL;  in ovl_fh_to_dentry()  local
817 	dentry = (flags & OVL_FH_FLAG_PATH_UPPER) ?  in ovl_fh_to_dentry()
820 	err = PTR_ERR(dentry);  in ovl_fh_to_dentry()
821 	if (IS_ERR(dentry) && err != -ESTALE)  in ovl_fh_to_dentry()
829 	return dentry;  in ovl_fh_to_dentry()
834 	dentry = ERR_PTR(err);  in ovl_fh_to_dentry()
838 static struct dentry *ovl_fh_to_parent(struct super_block *sb, struct fid *fid,  in ovl_fh_to_parent()
845 static int ovl_get_name(struct dentry *parent, char *name,  in ovl_get_name()
846 			struct dentry *child)  in ovl_get_name()
856 static struct dentry *ovl_get_parent(struct dentry *dentry)  in ovl_get_parent()  argument