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 dentry *dentry, u32 *fid, int buflen)  in ovl_dentry_to_fid()  argument
224 	err = enc_lower = ovl_check_encode_origin(dentry);  in ovl_dentry_to_fid()
229 	fh = ovl_encode_real_fh(enc_lower ? ovl_dentry_lower(dentry) :  in ovl_dentry_to_fid()
230 				ovl_dentry_upper(dentry), !enc_lower);  in ovl_dentry_to_fid()
245 			    dentry, err);  in ovl_dentry_to_fid()
252 	struct dentry *dentry;  in ovl_encode_fh()  local
259 	dentry = d_find_any_alias(inode);  in ovl_encode_fh()
260 	if (!dentry)  in ovl_encode_fh()
263 	bytes = ovl_dentry_to_fid(dentry, fid, buflen);  in ovl_encode_fh()
264 	dput(dentry);  in ovl_encode_fh()
278 static struct dentry *ovl_obtain_alias(struct super_block *sb,  in ovl_obtain_alias()
279 				       struct dentry *upper_alias,  in ovl_obtain_alias()
281 				       struct dentry *index)  in ovl_obtain_alias()
283 	struct dentry *lower = lowerpath ? lowerpath->dentry : NULL;  in ovl_obtain_alias()
284 	struct dentry *upper = upper_alias ?: index;  in ovl_obtain_alias()
285 	struct dentry *dentry;  in ovl_obtain_alias()  local
308 	dentry = d_find_any_alias(inode);  in ovl_obtain_alias()
309 	if (dentry)  in ovl_obtain_alias()
312 	dentry = d_alloc_anon(inode->i_sb);  in ovl_obtain_alias()
313 	if (unlikely(!dentry))  in ovl_obtain_alias()
320 		oe->lowerstack->dentry = dget(lower);  in ovl_obtain_alias()
323 	dentry->d_fsdata = oe;  in ovl_obtain_alias()
325 		ovl_dentry_set_upper_alias(dentry);  in ovl_obtain_alias()
327 	ovl_dentry_update_reval(dentry, upper,  in ovl_obtain_alias()
330 	return d_instantiate_anon(dentry, inode);  in ovl_obtain_alias()
333 	dput(dentry);  in ovl_obtain_alias()
334 	dentry = ERR_PTR(-ENOMEM);  in ovl_obtain_alias()
337 	return dentry;  in ovl_obtain_alias()
341 static struct dentry *ovl_dentry_real_at(struct dentry *dentry, int idx)  in ovl_dentry_real_at()  argument
343 	struct ovl_entry *oe = dentry->d_fsdata;  in ovl_dentry_real_at()
347 		return ovl_dentry_upper(dentry);  in ovl_dentry_real_at()
351 			return oe->lowerstack[i].dentry;  in ovl_dentry_real_at()
363 static struct dentry *ovl_lookup_real_one(struct dentry *connected,  in ovl_lookup_real_one()
364 					  struct dentry *real,  in ovl_lookup_real_one()
368 	struct dentry *this, *parent = NULL;  in ovl_lookup_real_one()
419 static struct dentry *ovl_lookup_real(struct super_block *sb,
420 				      struct dentry *real,
426 static struct dentry *ovl_lookup_real_inode(struct super_block *sb,  in ovl_lookup_real_inode()
427 					    struct dentry *real,  in ovl_lookup_real_inode()
431 	struct dentry *index = NULL;  in ovl_lookup_real_inode()
432 	struct dentry *this = NULL;  in ovl_lookup_real_inode()
459 		struct dentry *upper = ovl_index_upper(ofs, index);  in ovl_lookup_real_inode()
491 static struct dentry *ovl_lookup_real_ancestor(struct super_block *sb,  in ovl_lookup_real_ancestor()
492 					       struct dentry *real,  in ovl_lookup_real_ancestor()
495 	struct dentry *next, *parent = NULL;  in ovl_lookup_real_ancestor()
496 	struct dentry *ancestor = ERR_PTR(-EIO);  in ovl_lookup_real_ancestor()
544 static struct dentry *ovl_lookup_real(struct super_block *sb,  in ovl_lookup_real()
545 				      struct dentry *real,  in ovl_lookup_real()
548 	struct dentry *connected;  in ovl_lookup_real()
556 		struct dentry *next, *this;  in ovl_lookup_real()
557 		struct dentry *parent = NULL;  in ovl_lookup_real()
558 		struct dentry *real_connected = ovl_dentry_real_at(connected,  in ovl_lookup_real()
646 static struct dentry *ovl_get_dentry(struct super_block *sb,  in ovl_get_dentry()
647 				     struct dentry *upper,  in ovl_get_dentry()
649 				     struct dentry *index)  in ovl_get_dentry()
653 	struct dentry *real = upper ?: (index ?: lowerpath->dentry);  in ovl_get_dentry()
673 static struct dentry *ovl_upper_fh_to_d(struct super_block *sb,  in ovl_upper_fh_to_d()
677 	struct dentry *dentry;  in ovl_upper_fh_to_d()  local
678 	struct dentry *upper;  in ovl_upper_fh_to_d()
687 	dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_upper_fh_to_d()
690 	return dentry;  in ovl_upper_fh_to_d()
693 static struct dentry *ovl_lower_fh_to_d(struct super_block *sb,  in ovl_lower_fh_to_d()
699 	struct dentry *dentry = NULL;  in ovl_lower_fh_to_d()  local
700 	struct dentry *index = NULL;  in ovl_lower_fh_to_d()
709 	if (!d_is_dir(origin.dentry) ||  in ovl_lower_fh_to_d()
710 	    !(origin.dentry->d_flags & DCACHE_DISCONNECTED)) {  in ovl_lower_fh_to_d()
711 		inode = ovl_lookup_inode(sb, origin.dentry, false);  in ovl_lower_fh_to_d()
716 			dentry = d_find_any_alias(inode);  in ovl_lower_fh_to_d()
718 			if (dentry)  in ovl_lower_fh_to_d()
735 		struct dentry *upper = ovl_index_upper(ofs, index);  in ovl_lower_fh_to_d()
741 		dentry = ovl_get_dentry(sb, upper, NULL, NULL);  in ovl_lower_fh_to_d()
747 	if (d_is_dir(origin.dentry)) {  in ovl_lower_fh_to_d()
748 		dput(origin.dentry);  in ovl_lower_fh_to_d()
749 		origin.dentry = NULL;  in ovl_lower_fh_to_d()
755 		err = ovl_verify_origin(ofs, index, origin.dentry, false);  in ovl_lower_fh_to_d()
761 	dentry = ovl_get_dentry(sb, NULL, &origin, index);  in ovl_lower_fh_to_d()
764 	dput(origin.dentry);  in ovl_lower_fh_to_d()
766 	return dentry;  in ovl_lower_fh_to_d()
769 	dentry = ERR_PTR(err);  in ovl_lower_fh_to_d()
796 static struct dentry *ovl_fh_to_dentry(struct super_block *sb, struct fid *fid,  in ovl_fh_to_dentry()
799 	struct dentry *dentry = NULL;  in ovl_fh_to_dentry()  local
815 	dentry = (flags & OVL_FH_FLAG_PATH_UPPER) ?  in ovl_fh_to_dentry()
818 	err = PTR_ERR(dentry);  in ovl_fh_to_dentry()
819 	if (IS_ERR(dentry) && err != -ESTALE)  in ovl_fh_to_dentry()
827 	return dentry;  in ovl_fh_to_dentry()
832 	dentry = ERR_PTR(err);  in ovl_fh_to_dentry()
836 static struct dentry *ovl_fh_to_parent(struct super_block *sb, struct fid *fid,  in ovl_fh_to_parent()
843 static int ovl_get_name(struct dentry *parent, char *name,  in ovl_get_name()
844 			struct dentry *child)  in ovl_get_name()
854 static struct dentry *ovl_get_parent(struct dentry *dentry)  in ovl_get_parent()  argument