Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

26 files changed, 9887 insertions, 0 deletions

diff --git a/src/plugins/quota-clone/Makefile.am b/src/plugins/quota-clone/Makefile.am
new file mode 100644
index 0000000..ed4ba68
--- /dev/null
+++ b/src/plugins/quota-clone/Makefile.am
@@ -0,0 +1,19 @@
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diff --git a/src/plugins/quota-clone/Makefile.in b/src/plugins/quota-clone/Makefile.in
new file mode 100644
index 0000000..3f6157b
--- /dev/null
+++ b/src/plugins/quota-clone/Makefile.in
@@ -0,0 +1,822 @@
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+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/plugins/quota
+
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+	lib20_quota_clone_plugin.la
+
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+	quota-clone-plugin.c
+
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+	quota-clone-plugin.h
+
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+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/plugins/quota-clone/Makefile
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+	  *config.status*) \
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+	done
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+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+lib20_quota_clone_plugin.la: $(lib20_quota_clone_plugin_la_OBJECTS) $(lib20_quota_clone_plugin_la_DEPENDENCIES) $(EXTRA_lib20_quota_clone_plugin_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(lib20_quota_clone_plugin_la_LINK) -rpath $(moduledir) $(lib20_quota_clone_plugin_la_OBJECTS) $(lib20_quota_clone_plugin_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/quota-clone-plugin.Plo@am__quote@ # am--include-marker
+
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+	      "$$@" $$unique; \
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+	      $$unique; \
+	  fi; \
+	fi
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+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
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+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
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+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	@echo "it deletes files that may require special tools to rebuild."
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+clean-am: clean-generic clean-libtool clean-moduleLTLIBRARIES \
+	mostlyclean-am
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+distclean: distclean-am
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+	-rm -f Makefile
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+	distclean-tags
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+dvi: dvi-am
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+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/plugins/quota-clone/quota-clone-plugin.c b/src/plugins/quota-clone/quota-clone-plugin.c
new file mode 100644
index 0000000..5f5efa4
--- /dev/null
+++ b/src/plugins/quota-clone/quota-clone-plugin.c
@@ -0,0 +1,308 @@
+/* Copyright (c) 2015-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "module-context.h"
+#include "ioloop.h"
+#include "dict.h"
+#include "mail-storage-private.h"
+#include "quota.h"
+#include "quota-clone-plugin.h"
+
+/* If mailbox is kept open for this many milliseconds after quota update,
+   flush quota-clone. */
+#define QUOTA_CLONE_FLUSH_DELAY_MSECS (10*1000)
+
+#define DICT_QUOTA_CLONE_PATH DICT_PATH_PRIVATE"quota/"
+#define DICT_QUOTA_CLONE_BYTES_PATH DICT_QUOTA_CLONE_PATH"storage"
+#define DICT_QUOTA_CLONE_COUNT_PATH DICT_QUOTA_CLONE_PATH"messages"
+
+#define QUOTA_CLONE_USER_CONTEXT_REQUIRE(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, quota_clone_user_module)
+#define QUOTA_CLONE_USER_CONTEXT(obj) \
+	MODULE_CONTEXT(obj, quota_clone_user_module)
+#define QUOTA_CLONE_CONTEXT(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, quota_clone_storage_module)
+
+static MODULE_CONTEXT_DEFINE_INIT(quota_clone_user_module,
+				  &mail_user_module_register);
+static MODULE_CONTEXT_DEFINE_INIT(quota_clone_storage_module,
+				  &mail_storage_module_register);
+
+struct quota_clone_user {
+	union mail_user_module_context module_ctx;
+	struct dict *dict;
+	struct timeout *to_quota_flush;
+	bool quota_changed;
+	bool quota_flushing;
+};
+
+static void
+quota_clone_dict_commit(const struct dict_commit_result *result,
+			struct quota_clone_user *quser)
+{
+	switch (result->ret) {
+	case DICT_COMMIT_RET_OK:
+	case DICT_COMMIT_RET_NOTFOUND:
+		if (!quser->quota_changed)
+			timeout_remove(&quser->to_quota_flush);
+		break;
+	case DICT_COMMIT_RET_FAILED:
+		quser->quota_changed = TRUE;
+		i_error("quota_clone_dict: Failed to write value: %s",
+			result->error);
+		break;
+	case DICT_COMMIT_RET_WRITE_UNCERTAIN:
+		quser->quota_changed = TRUE;
+		i_error("quota_clone_dict: Write was unconfirmed (timeout or disconnect): %s",
+			result->error);
+		break;
+	}
+
+	quser->quota_flushing = FALSE;
+}
+
+static bool quota_clone_flush_real(struct mail_user *user)
+{
+	struct quota_clone_user *quser =
+		QUOTA_CLONE_USER_CONTEXT_REQUIRE(user);
+	struct dict_transaction_context *trans;
+	struct quota_root_iter *iter;
+	struct quota_root *root;
+	uint64_t bytes_value, count_value, limit;
+	const char *error;
+	enum quota_get_result bytes_res, count_res;
+
+	/* we'll clone the first quota root */
+	iter = quota_root_iter_init_user(user);
+	root = quota_root_iter_next(iter);
+	quota_root_iter_deinit(&iter);
+	if (root == NULL) {
+		/* no quota roots defined - ignore */
+		quser->quota_changed = FALSE;
+		return TRUE;
+	}
+
+	/* get new values first */
+	bytes_res = quota_get_resource(root, "", QUOTA_NAME_STORAGE_BYTES,
+				       &bytes_value, &limit, &error);
+	if (bytes_res == QUOTA_GET_RESULT_INTERNAL_ERROR) {
+		i_error("quota_clone_plugin: "
+			"Failed to get quota resource "QUOTA_NAME_STORAGE_BYTES": %s",
+			error);
+		return TRUE;
+	}
+	count_res = quota_get_resource(root, "", QUOTA_NAME_MESSAGES,
+				       &count_value, &limit, &error);
+	if (count_res == QUOTA_GET_RESULT_INTERNAL_ERROR) {
+		i_error("quota_clone_plugin: "
+			"Failed to get quota resource "QUOTA_NAME_MESSAGES": %s",
+			error);
+		return TRUE;
+	}
+	if (bytes_res == QUOTA_GET_RESULT_UNKNOWN_RESOURCE &&
+	    count_res == QUOTA_GET_RESULT_UNKNOWN_RESOURCE) {
+		/* quota resources don't exist - no point in updating it */
+		return TRUE;
+	}
+	if (bytes_res == QUOTA_GET_RESULT_BACKGROUND_CALC &&
+	    count_res == QUOTA_GET_RESULT_BACKGROUND_CALC) {
+		/* Blocked by an ongoing quota calculation - try again later */
+		quser->quota_flushing = FALSE;
+		return FALSE;
+	}
+
+	/* Then update the resources that exist. The resources' existence can't
+	   change unless the quota backend is changed, so we don't worry about
+	   the special case of lookup changing from
+	   RESULT_LIMITED/RESULT_UNLIMITED to RESULT_UNKNOWN_RESOURCE, which
+	   leaves the old value unchanged. */
+	const struct dict_op_settings *set = mail_user_get_dict_op_settings(user);
+	trans = dict_transaction_begin(quser->dict, set);
+	if (bytes_res == QUOTA_GET_RESULT_LIMITED ||
+	    bytes_res == QUOTA_GET_RESULT_UNLIMITED) {
+		dict_set(trans, DICT_QUOTA_CLONE_BYTES_PATH,
+			 t_strdup_printf("%"PRIu64, bytes_value));
+	}
+	if (count_res == QUOTA_GET_RESULT_LIMITED ||
+	    count_res == QUOTA_GET_RESULT_UNLIMITED) {
+		dict_set(trans, DICT_QUOTA_CLONE_COUNT_PATH,
+			 t_strdup_printf("%"PRIu64, count_value));
+	}
+	quser->quota_changed = FALSE;
+	dict_transaction_commit_async(&trans, quota_clone_dict_commit, quser);
+	return FALSE;
+}
+
+static void quota_clone_flush(struct mail_user *user)
+{
+	struct quota_clone_user *quser =
+		QUOTA_CLONE_USER_CONTEXT_REQUIRE(user);
+
+	if (quser->quota_changed) {
+		i_assert(quser->to_quota_flush != NULL);
+		if (quser->quota_flushing) {
+			/* async quota commit is running in background. timeout is still
+			   active, so another update will be done later. */
+		} else {
+			quser->quota_flushing = TRUE;
+			/* Returns TRUE if flushing action is complete. */
+			if (quota_clone_flush_real(user)) {
+				quser->quota_flushing = FALSE;
+				timeout_remove(&quser->to_quota_flush);
+			}
+		}
+	} else {
+		timeout_remove(&quser->to_quota_flush);
+	}
+}
+
+static struct mail_user *quota_mailbox_get_user(struct mailbox *box)
+{
+	struct mail_namespace *ns = mailbox_list_get_namespace(box->list);
+	return ns->owner != NULL ? ns->owner : ns->user;
+}
+
+static void quota_clone_changed(struct mailbox *box)
+{
+	struct mail_user *user = quota_mailbox_get_user(box);
+	struct quota_clone_user *quser =
+		QUOTA_CLONE_USER_CONTEXT_REQUIRE(user);
+
+	quser->quota_changed = TRUE;
+	if (quser->to_quota_flush == NULL) {
+		quser->to_quota_flush = timeout_add(QUOTA_CLONE_FLUSH_DELAY_MSECS,
+						    quota_clone_flush, user);
+	}
+}
+
+static int quota_clone_save_finish(struct mail_save_context *ctx)
+{
+	union mailbox_module_context *qbox =
+		QUOTA_CLONE_CONTEXT(ctx->transaction->box);
+
+	quota_clone_changed(ctx->transaction->box);
+	return qbox->super.save_finish(ctx);
+}
+
+static int
+quota_clone_copy(struct mail_save_context *ctx, struct mail *mail)
+{
+	union mailbox_module_context *qbox =
+		QUOTA_CLONE_CONTEXT(ctx->transaction->box);
+
+	quota_clone_changed(ctx->transaction->box);
+	return qbox->super.copy(ctx, mail);
+}
+
+static void
+quota_clone_mailbox_sync_notify(struct mailbox *box, uint32_t uid,
+				enum mailbox_sync_type sync_type)
+{
+	union mailbox_module_context *qbox = QUOTA_CLONE_CONTEXT(box);
+
+	if (qbox->super.sync_notify != NULL)
+		qbox->super.sync_notify(box, uid, sync_type);
+
+	if (sync_type == MAILBOX_SYNC_TYPE_EXPUNGE)
+		quota_clone_changed(box);
+}
+
+static void quota_clone_mailbox_allocated(struct mailbox *box)
+{
+	struct quota_clone_user *quser =
+		QUOTA_CLONE_USER_CONTEXT(box->storage->user);
+	struct mailbox_vfuncs *v = box->vlast;
+	union mailbox_module_context *qbox;
+
+	if (quser == NULL)
+		return;
+
+	qbox = p_new(box->pool, union mailbox_module_context, 1);
+	qbox->super = *v;
+	box->vlast = &qbox->super;
+
+	v->save_finish = quota_clone_save_finish;
+	v->copy = quota_clone_copy;
+	v->sync_notify = quota_clone_mailbox_sync_notify;
+	MODULE_CONTEXT_SET_SELF(box, quota_clone_storage_module, qbox);
+}
+
+static void quota_clone_mail_user_deinit_pre(struct mail_user *user)
+{
+	struct quota_clone_user *quser = QUOTA_CLONE_USER_CONTEXT_REQUIRE(user);
+
+	dict_wait(quser->dict);
+	/* Check once more if quota needs to be updated. This needs to be done
+	   in deinit_pre(), because at deinit() the quota is already
+	   deinitialized. */
+	if (quser->to_quota_flush != NULL) {
+		i_assert(!quser->quota_flushing);
+		quota_clone_flush(user);
+		dict_wait(quser->dict);
+		/* If dict update fails or background calculation is running,
+		   the timeout is still set. Just forget about it. */
+		timeout_remove(&quser->to_quota_flush);
+	}
+	quser->module_ctx.super.deinit_pre(user);
+}
+
+static void quota_clone_mail_user_deinit(struct mail_user *user)
+{
+	struct quota_clone_user *quser = QUOTA_CLONE_USER_CONTEXT_REQUIRE(user);
+
+	/* wait once more, just in case something changed quota during
+	   deinit_pre() */
+	dict_wait(quser->dict);
+	i_assert(quser->to_quota_flush == NULL);
+	dict_deinit(&quser->dict);
+	quser->module_ctx.super.deinit(user);
+}
+
+static void quota_clone_mail_user_created(struct mail_user *user)
+{
+	struct quota_clone_user *quser;
+	struct mail_user_vfuncs *v = user->vlast;
+	struct dict_settings dict_set;
+	struct dict *dict;
+	const char *uri, *error;
+
+	uri = mail_user_plugin_getenv(user, "quota_clone_dict");
+	if (uri == NULL || uri[0] == '\0') {
+		e_debug(user->event, "The quota_clone_dict setting is missing from configuration");
+		return;
+	}
+
+	i_zero(&dict_set);
+	dict_set.base_dir = user->set->base_dir;
+	dict_set.event_parent = user->event;
+	if (dict_init(uri, &dict_set, &dict, &error) < 0) {
+		i_error("quota_clone_dict: Failed to initialize '%s': %s",
+			uri, error);
+		return;
+	}
+
+	quser = p_new(user->pool, struct quota_clone_user, 1);
+	quser->module_ctx.super = *v;
+	user->vlast = &quser->module_ctx.super;
+	v->deinit_pre = quota_clone_mail_user_deinit_pre;
+	v->deinit = quota_clone_mail_user_deinit;
+	quser->dict = dict;
+	MODULE_CONTEXT_SET(user, quota_clone_user_module, quser);
+}
+
+static struct mail_storage_hooks quota_clone_mail_storage_hooks = {
+	.mailbox_allocated = quota_clone_mailbox_allocated,
+	.mail_user_created = quota_clone_mail_user_created
+};
+
+void quota_clone_plugin_init(struct module *module ATTR_UNUSED)
+{
+	mail_storage_hooks_add(module, &quota_clone_mail_storage_hooks);
+}
+
+void quota_clone_plugin_deinit(void)
+{
+	mail_storage_hooks_remove(&quota_clone_mail_storage_hooks);
+}
+
+const char *quota_clone_plugin_dependencies[] = { "quota", NULL };
diff --git a/src/plugins/quota-clone/quota-clone-plugin.h b/src/plugins/quota-clone/quota-clone-plugin.h
new file mode 100644
index 0000000..9ae1d8f
--- /dev/null
+++ b/src/plugins/quota-clone/quota-clone-plugin.h
@@ -0,0 +1,7 @@
+#ifndef QUOTA_CLONE_PLUGIN_H
+#define QUOTA_CLONE_PLUGIN_H
+
+void quota_clone_plugin_init(struct module *module);
+void quota_clone_plugin_deinit(void);
+
+#endif
diff --git a/src/plugins/quota/Makefile.am b/src/plugins/quota/Makefile.am
new file mode 100644
index 0000000..e8bad8c
--- /dev/null
+++ b/src/plugins/quota/Makefile.am
@@ -0,0 +1,144 @@
+doveadm_moduledir = $(moduledir)/doveadm
+
+pkglibexecdir = $(libexecdir)/dovecot
+pkglibexec_PROGRAMS = quota-status
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-test \
+	-I$(top_srcdir)/src/lib-master \
+	-I$(top_srcdir)/src/lib-dict \
+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-smtp \
+	-I$(top_srcdir)/src/lib-imap \
+	-I$(top_srcdir)/src/lib-imap-client \
+	-I$(top_srcdir)/src/lib-settings \
+	-I$(top_srcdir)/src/lib-ssl-iostream \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/lib-storage/index \
+	-I$(top_srcdir)/src/lib-storage/index/imapc \
+	-I$(top_srcdir)/src/lib-storage/index/maildir \
+	-I$(top_srcdir)/src/lib-program-client \
+	-I$(top_srcdir)/src/doveadm \
+	$(LIBTIRPC_CFLAGS)
+
+NOPLUGIN_LDFLAGS =
+lib10_doveadm_quota_plugin_la_LDFLAGS = -module -avoid-version
+lib10_quota_plugin_la_LDFLAGS = -module -avoid-version
+
+module_LTLIBRARIES = \
+	lib10_quota_plugin.la
+
+quota_dist_sources = \
+	quota.c \
+	quota-count.c \
+	quota-fs.c \
+	quota-dict.c \
+	quota-dirsize.c \
+	quota-imapc.c \
+	quota-maildir.c \
+        quota-plugin.c \
+	quota-storage.c \
+	quota-util.c
+
+quota_common_objects = \
+	quota.lo \
+	quota-count.lo \
+	quota-fs.lo \
+	quota-dict.lo \
+	quota-dirsize.lo \
+	quota-imapc.lo \
+	quota-maildir.lo \
+        quota-plugin.lo \
+	quota-storage.lo \
+	quota-util.lo \
+	$(RQUOTA_XDR_LO)
+
+lib10_quota_plugin_la_SOURCES = $(quota_dist_sources)
+nodist_lib10_quota_plugin_la_SOURCES = $(RQUOTA_XDR)
+lib10_quota_plugin_la_LIBADD = $(QUOTA_LIBS)
+
+doveadm_module_LTLIBRARIES = \
+	lib10_doveadm_quota_plugin.la
+
+lib10_doveadm_quota_plugin_la_SOURCES = \
+	doveadm-quota.c
+
+quota_status_SOURCES = \
+	quota-status.c \
+	quota-status-settings.c
+
+quota_status_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+quota_status_LDADD = \
+	$(quota_common_objects) \
+	$(LIBDOVECOT_STORAGE) \
+	$(LIBDOVECOT) \
+	$(QUOTA_LIBS) \
+	$(BINARY_LDFLAGS)
+quota_status_DEPENDENCIES = \
+	$(quota_common_objects) \
+	$(LIBDOVECOT_STORAGE_DEPS) \
+	$(LIBDOVECOT_DEPS)
+
+if HAVE_RQUOTA
+RQUOTA_XDR = rquota_xdr.c
+RQUOTA_XDR_LO = rquota_xdr.lo
+#RQUOTA_X = /usr/include/rpcsvc/rquota.x
+RQUOTA_X = $(srcdir)/rquota.x
+rquota_xdr.c: Makefile rquota.h
+	if [ "$(top_srcdir)" != "$(top_builddir)" ]; then \
+	  cp $(RQUOTA_X) $(top_builddir)/src/plugins/quota/; \
+	fi; \
+	(echo '#include "lib.h"'; \
+	 echo '#undef FALSE'; \
+	 echo '#undef TRUE'; \
+	 echo '#include <rpc/rpc.h>'; \
+	 $(RPCGEN) -c $(top_builddir)/src/plugins/quota/rquota.x | \
+	  sed -e 's/IXDR_PUT/(void)IXDR_PUT/g' \
+	    -e 's,!xdr_,0 == xdr_,' \
+	    -e 's,/usr/include/rpcsvc/rquota.h,rquota.h,' \
+	    -e 's/int32_t \*buf/int32_t *buf ATTR_UNUSED/' \
+	    -e 's/^static char rcsid.*//' ) > rquota_xdr.c
+
+rquota.h: Makefile $(RQUOTA_X)
+	$(RPCGEN) -h $(RQUOTA_X) > rquota.h
+
+quota-fs.lo: rquota.h
+
+endif
+
+pkginc_libdir=$(pkgincludedir)
+pkginc_lib_HEADERS = \
+	quota.h \
+	quota-fs.h \
+	quota-plugin.h \
+	quota-private.h
+noinst_HEADERS = \
+	quota-status-settings.h
+
+EXTRA_DIST = rquota.x
+
+clean-generic:
+	if [ "$(top_srcdir)" != "$(top_builddir)" ]; then \
+	  rm -f $(top_builddir)/src/plugins/quota/rquota.x; \
+	fi; \
+	rm -f rquota_xdr.c rquota.h
+
+test_programs = \
+	test-quota-util
+noinst_PROGRAMS = $(test_programs)
+
+test_libs = \
+	../../lib-test/libtest.la \
+	../../lib/liblib.la
+test_deps = $(noinst_LTLIBRARIES) $(test_libs)
+
+test_quota_util_SOURCES = test-quota-util.c
+test_quota_util_LDADD = quota-util.lo $(test_libs)
+test_quota_util_DEPENDENCIES = quota-util.lo $(test_deps)
+
+check-local:
+	for bin in $(test_programs); do \
+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
+	done
diff --git a/src/plugins/quota/Makefile.in b/src/plugins/quota/Makefile.in
new file mode 100644
index 0000000..a8a824f
--- /dev/null
+++ b/src/plugins/quota/Makefile.in
@@ -0,0 +1,1179 @@
+# Makefile.in generated by automake 1.16.1 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2018 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+
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+         $(am__cd) "$$dir" && rm -f $$files; }; \
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+	$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=link $(CCLD) \
+	$(AM_CFLAGS) $(CFLAGS) \
+	$(lib10_doveadm_quota_plugin_la_LDFLAGS) $(LDFLAGS) -o $@
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+	$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=link $(CCLD) \
+	$(AM_CFLAGS) $(CFLAGS) $(lib10_quota_plugin_la_LDFLAGS) \
+	$(LDFLAGS) -o $@
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+	./$(DEPDIR)/quota-count.Plo ./$(DEPDIR)/quota-dict.Plo \
+	./$(DEPDIR)/quota-dirsize.Plo ./$(DEPDIR)/quota-fs.Plo \
+	./$(DEPDIR)/quota-imapc.Plo ./$(DEPDIR)/quota-maildir.Plo \
+	./$(DEPDIR)/quota-plugin.Plo ./$(DEPDIR)/quota-storage.Plo \
+	./$(DEPDIR)/quota-util.Plo ./$(DEPDIR)/quota.Plo \
+	./$(DEPDIR)/quota_status-quota-status-settings.Po \
+	./$(DEPDIR)/quota_status-quota-status.Po \
+	./$(DEPDIR)/rquota_xdr.Plo ./$(DEPDIR)/test-quota-util.Po
+am__mv = mv -f
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+	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
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+	$(LIBTOOLFLAGS) --mode=compile $(CC) $(DEFS) \
+	$(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) $(CPPFLAGS) \
+	$(AM_CFLAGS) $(CFLAGS)
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+LINK = $(LIBTOOL) $(AM_V_lt) --tag=CC $(AM_LIBTOOLFLAGS) \
+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+	$(AM_LDFLAGS) $(LDFLAGS) -o $@
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+	$(lib10_quota_plugin_la_SOURCES) \
+	$(nodist_lib10_quota_plugin_la_SOURCES) \
+	$(quota_status_SOURCES) $(test_quota_util_SOURCES)
+DIST_SOURCES = $(lib10_doveadm_quota_plugin_la_SOURCES) \
+	$(lib10_quota_plugin_la_SOURCES) $(quota_status_SOURCES) \
+	$(test_quota_util_SOURCES)
+am__can_run_installinfo = \
+  case $$AM_UPDATE_INFO_DIR in \
+    n|no|NO) false;; \
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+  { items[$$0] = 1; nonempty = 1; } \
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+KRB5CONFIG = @KRB5CONFIG@
+KRB5_CFLAGS = @KRB5_CFLAGS@
+KRB5_LIBS = @KRB5_LIBS@
+LD = @LD@
+LDAP_LIBS = @LDAP_LIBS@
+LDFLAGS = @LDFLAGS@
+LD_NO_WHOLE_ARCHIVE = @LD_NO_WHOLE_ARCHIVE@
+LD_WHOLE_ARCHIVE = @LD_WHOLE_ARCHIVE@
+LIBCAP = @LIBCAP@
+LIBDOVECOT = @LIBDOVECOT@
+LIBDOVECOT_COMPRESS = @LIBDOVECOT_COMPRESS@
+LIBDOVECOT_DEPS = @LIBDOVECOT_DEPS@
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+LIBDOVECOT_LIBFTS_DEPS = @LIBDOVECOT_LIBFTS_DEPS@
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+LIBDOVECOT_LUA = @LIBDOVECOT_LUA@
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+LIBDOVECOT_STORAGE = @LIBDOVECOT_STORAGE@
+LIBDOVECOT_STORAGE_DEPS = @LIBDOVECOT_STORAGE_DEPS@
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+LIBTIRPC_CFLAGS = @LIBTIRPC_CFLAGS@
+LIBTIRPC_LIBS = @LIBTIRPC_LIBS@
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+LIBUNWIND_CFLAGS = @LIBUNWIND_CFLAGS@
+LIBUNWIND_LIBS = @LIBUNWIND_LIBS@
+LIBWRAP_LIBS = @LIBWRAP_LIBS@
+LINKED_STORAGE_LDADD = @LINKED_STORAGE_LDADD@
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+MODULE_SUFFIX = @MODULE_SUFFIX@
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+MYSQL_CONFIG = @MYSQL_CONFIG@
+MYSQL_LIBS = @MYSQL_LIBS@
+NM = @NM@
+NMEDIT = @NMEDIT@
+NOPLUGIN_LDFLAGS = 
+OBJDUMP = @OBJDUMP@
+OBJEXT = @OBJEXT@
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+OTOOL64 = @OTOOL64@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
+PACKAGE_VERSION = @PACKAGE_VERSION@
+PANDOC = @PANDOC@
+PATH_SEPARATOR = @PATH_SEPARATOR@
+PGSQL_CFLAGS = @PGSQL_CFLAGS@
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+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+doveadm_moduledir = $(moduledir)/doveadm
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-test \
+	-I$(top_srcdir)/src/lib-master \
+	-I$(top_srcdir)/src/lib-dict \
+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-smtp \
+	-I$(top_srcdir)/src/lib-imap \
+	-I$(top_srcdir)/src/lib-imap-client \
+	-I$(top_srcdir)/src/lib-settings \
+	-I$(top_srcdir)/src/lib-ssl-iostream \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/lib-storage/index \
+	-I$(top_srcdir)/src/lib-storage/index/imapc \
+	-I$(top_srcdir)/src/lib-storage/index/maildir \
+	-I$(top_srcdir)/src/lib-program-client \
+	-I$(top_srcdir)/src/doveadm \
+	$(LIBTIRPC_CFLAGS)
+
+lib10_doveadm_quota_plugin_la_LDFLAGS = -module -avoid-version
+lib10_quota_plugin_la_LDFLAGS = -module -avoid-version
+module_LTLIBRARIES = \
+	lib10_quota_plugin.la
+
+quota_dist_sources = \
+	quota.c \
+	quota-count.c \
+	quota-fs.c \
+	quota-dict.c \
+	quota-dirsize.c \
+	quota-imapc.c \
+	quota-maildir.c \
+        quota-plugin.c \
+	quota-storage.c \
+	quota-util.c
+
+quota_common_objects = \
+	quota.lo \
+	quota-count.lo \
+	quota-fs.lo \
+	quota-dict.lo \
+	quota-dirsize.lo \
+	quota-imapc.lo \
+	quota-maildir.lo \
+        quota-plugin.lo \
+	quota-storage.lo \
+	quota-util.lo \
+	$(RQUOTA_XDR_LO)
+
+lib10_quota_plugin_la_SOURCES = $(quota_dist_sources)
+nodist_lib10_quota_plugin_la_SOURCES = $(RQUOTA_XDR)
+lib10_quota_plugin_la_LIBADD = $(QUOTA_LIBS)
+doveadm_module_LTLIBRARIES = \
+	lib10_doveadm_quota_plugin.la
+
+lib10_doveadm_quota_plugin_la_SOURCES = \
+	doveadm-quota.c
+
+quota_status_SOURCES = \
+	quota-status.c \
+	quota-status-settings.c
+
+quota_status_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+quota_status_LDADD = \
+	$(quota_common_objects) \
+	$(LIBDOVECOT_STORAGE) \
+	$(LIBDOVECOT) \
+	$(QUOTA_LIBS) \
+	$(BINARY_LDFLAGS)
+
+quota_status_DEPENDENCIES = \
+	$(quota_common_objects) \
+	$(LIBDOVECOT_STORAGE_DEPS) \
+	$(LIBDOVECOT_DEPS)
+
+@HAVE_RQUOTA_TRUE@RQUOTA_XDR = rquota_xdr.c
+@HAVE_RQUOTA_TRUE@RQUOTA_XDR_LO = rquota_xdr.lo
+#RQUOTA_X = /usr/include/rpcsvc/rquota.x
+@HAVE_RQUOTA_TRUE@RQUOTA_X = $(srcdir)/rquota.x
+pkginc_libdir = $(pkgincludedir)
+pkginc_lib_HEADERS = \
+	quota.h \
+	quota-fs.h \
+	quota-plugin.h \
+	quota-private.h
+
+noinst_HEADERS = \
+	quota-status-settings.h
+
+EXTRA_DIST = rquota.x
+test_programs = \
+	test-quota-util
+
+test_libs = \
+	../../lib-test/libtest.la \
+	../../lib/liblib.la
+
+test_deps = $(noinst_LTLIBRARIES) $(test_libs)
+test_quota_util_SOURCES = test-quota-util.c
+test_quota_util_LDADD = quota-util.lo $(test_libs)
+test_quota_util_DEPENDENCIES = quota-util.lo $(test_deps)
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/plugins/quota/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/plugins/quota/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+clean-noinstPROGRAMS:
+	@list='$(noinst_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+install-pkglibexecPROGRAMS: $(pkglibexec_PROGRAMS)
+	@$(NORMAL_INSTALL)
+	@list='$(pkglibexec_PROGRAMS)'; test -n "$(pkglibexecdir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(pkglibexecdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(pkglibexecdir)" || exit 1; \
+	fi; \
+	for p in $$list; do echo "$$p $$p"; done | \
+	sed 's/$(EXEEXT)$$//' | \
+	while read p p1; do if test -f $$p \
+	 || test -f $$p1 \
+	  ; then echo "$$p"; echo "$$p"; else :; fi; \
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+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-doveadm_moduleLTLIBRARIES clean-generic clean-libtool \
+	clean-moduleLTLIBRARIES clean-noinstPROGRAMS \
+	clean-pkglibexecPROGRAMS mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/doveadm-quota.Plo
+	-rm -f ./$(DEPDIR)/quota-count.Plo
+	-rm -f ./$(DEPDIR)/quota-dict.Plo
+	-rm -f ./$(DEPDIR)/quota-dirsize.Plo
+	-rm -f ./$(DEPDIR)/quota-fs.Plo
+	-rm -f ./$(DEPDIR)/quota-imapc.Plo
+	-rm -f ./$(DEPDIR)/quota-maildir.Plo
+	-rm -f ./$(DEPDIR)/quota-plugin.Plo
+	-rm -f ./$(DEPDIR)/quota-storage.Plo
+	-rm -f ./$(DEPDIR)/quota-util.Plo
+	-rm -f ./$(DEPDIR)/quota.Plo
+	-rm -f ./$(DEPDIR)/quota_status-quota-status-settings.Po
+	-rm -f ./$(DEPDIR)/quota_status-quota-status.Po
+	-rm -f ./$(DEPDIR)/rquota_xdr.Plo
+	-rm -f ./$(DEPDIR)/test-quota-util.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-doveadm_moduleLTLIBRARIES \
+	install-moduleLTLIBRARIES install-pkginc_libHEADERS
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-pkglibexecPROGRAMS
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/doveadm-quota.Plo
+	-rm -f ./$(DEPDIR)/quota-count.Plo
+	-rm -f ./$(DEPDIR)/quota-dict.Plo
+	-rm -f ./$(DEPDIR)/quota-dirsize.Plo
+	-rm -f ./$(DEPDIR)/quota-fs.Plo
+	-rm -f ./$(DEPDIR)/quota-imapc.Plo
+	-rm -f ./$(DEPDIR)/quota-maildir.Plo
+	-rm -f ./$(DEPDIR)/quota-plugin.Plo
+	-rm -f ./$(DEPDIR)/quota-storage.Plo
+	-rm -f ./$(DEPDIR)/quota-util.Plo
+	-rm -f ./$(DEPDIR)/quota.Plo
+	-rm -f ./$(DEPDIR)/quota_status-quota-status-settings.Po
+	-rm -f ./$(DEPDIR)/quota_status-quota-status.Po
+	-rm -f ./$(DEPDIR)/rquota_xdr.Plo
+	-rm -f ./$(DEPDIR)/test-quota-util.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-doveadm_moduleLTLIBRARIES \
+	uninstall-moduleLTLIBRARIES uninstall-pkginc_libHEADERS \
+	uninstall-pkglibexecPROGRAMS
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am \
+	check-local clean clean-doveadm_moduleLTLIBRARIES \
+	clean-generic clean-libtool clean-moduleLTLIBRARIES \
+	clean-noinstPROGRAMS clean-pkglibexecPROGRAMS cscopelist-am \
+	ctags ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-doveadm_moduleLTLIBRARIES install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-moduleLTLIBRARIES install-pdf install-pdf-am \
+	install-pkginc_libHEADERS install-pkglibexecPROGRAMS \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am \
+	uninstall-doveadm_moduleLTLIBRARIES \
+	uninstall-moduleLTLIBRARIES uninstall-pkginc_libHEADERS \
+	uninstall-pkglibexecPROGRAMS
+
+.PRECIOUS: Makefile
+
+@HAVE_RQUOTA_TRUE@rquota_xdr.c: Makefile rquota.h
+@HAVE_RQUOTA_TRUE@	if [ "$(top_srcdir)" != "$(top_builddir)" ]; then \
+@HAVE_RQUOTA_TRUE@	  cp $(RQUOTA_X) $(top_builddir)/src/plugins/quota/; \
+@HAVE_RQUOTA_TRUE@	fi; \
+@HAVE_RQUOTA_TRUE@	(echo '#include "lib.h"'; \
+@HAVE_RQUOTA_TRUE@	 echo '#undef FALSE'; \
+@HAVE_RQUOTA_TRUE@	 echo '#undef TRUE'; \
+@HAVE_RQUOTA_TRUE@	 echo '#include <rpc/rpc.h>'; \
+@HAVE_RQUOTA_TRUE@	 $(RPCGEN) -c $(top_builddir)/src/plugins/quota/rquota.x | \
+@HAVE_RQUOTA_TRUE@	  sed -e 's/IXDR_PUT/(void)IXDR_PUT/g' \
+@HAVE_RQUOTA_TRUE@	    -e 's,!xdr_,0 == xdr_,' \
+@HAVE_RQUOTA_TRUE@	    -e 's,/usr/include/rpcsvc/rquota.h,rquota.h,' \
+@HAVE_RQUOTA_TRUE@	    -e 's/int32_t \*buf/int32_t *buf ATTR_UNUSED/' \
+@HAVE_RQUOTA_TRUE@	    -e 's/^static char rcsid.*//' ) > rquota_xdr.c
+
+@HAVE_RQUOTA_TRUE@rquota.h: Makefile $(RQUOTA_X)
+@HAVE_RQUOTA_TRUE@	$(RPCGEN) -h $(RQUOTA_X) > rquota.h
+
+@HAVE_RQUOTA_TRUE@quota-fs.lo: rquota.h
+
+clean-generic:
+	if [ "$(top_srcdir)" != "$(top_builddir)" ]; then \
+	  rm -f $(top_builddir)/src/plugins/quota/rquota.x; \
+	fi; \
+	rm -f rquota_xdr.c rquota.h
+
+check-local:
+	for bin in $(test_programs); do \
+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
+	done
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/plugins/quota/doveadm-quota.c b/src/plugins/quota/doveadm-quota.c
new file mode 100644
index 0000000..8a42b22
--- /dev/null
+++ b/src/plugins/quota/doveadm-quota.c
@@ -0,0 +1,165 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "module-dir.h"
+#include "quota-plugin.h"
+#include "quota-private.h"
+#include "doveadm-print.h"
+#include "doveadm-mail.h"
+
+const char *doveadm_quota_plugin_version = DOVECOT_ABI_VERSION;
+
+void doveadm_quota_plugin_init(struct module *module);
+void doveadm_quota_plugin_deinit(void);
+
+static int cmd_quota_get_root(struct quota_root *root)
+{
+	const char *const *res;
+	const char *error;
+	uint64_t value, limit;
+	enum quota_get_result qret;
+	int ret = 0;
+
+	res = quota_root_get_resources(root);
+	for (; *res != NULL; res++) {
+		qret = quota_get_resource(root, "", *res, &value, &limit, &error);
+		doveadm_print(root->set->name);
+		doveadm_print(*res);
+		if (qret == QUOTA_GET_RESULT_LIMITED) {
+			doveadm_print_num(value);
+			doveadm_print_num(limit);
+			if (limit > 0)
+				doveadm_print_num(value*100 / limit);
+			else
+				doveadm_print("0");
+		} else if (qret == QUOTA_GET_RESULT_UNLIMITED) {
+			doveadm_print_num(value);
+			doveadm_print("-");
+			doveadm_print("0");
+		} else {
+			i_error("Failed to get quota resource %s: %s",
+				*res, error);
+			doveadm_print("error");
+			doveadm_print("error");
+			doveadm_print("error");
+			ret = -1;
+		}
+	}
+	return ret;
+}
+
+static int
+cmd_quota_get_run(struct doveadm_mail_cmd_context *ctx,
+		  struct mail_user *user)
+{
+	struct quota_user *quser = QUOTA_USER_CONTEXT(user);
+	struct quota_root *const *root;
+
+	if (quser == NULL) {
+		i_error("Quota not enabled");
+		doveadm_mail_failed_error(ctx, MAIL_ERROR_NOTFOUND);
+		return -1;
+	}
+
+	int ret = 0;
+	array_foreach(&quser->quota->roots, root)
+		if (cmd_quota_get_root(*root) < 0)
+			ret = -1;
+	if (ret < 0)
+		doveadm_mail_failed_error(ctx, MAIL_ERROR_TEMP);
+	return ret;
+}
+
+static void cmd_quota_get_init(struct doveadm_mail_cmd_context *ctx ATTR_UNUSED,
+			       const char *const args[] ATTR_UNUSED)
+{
+	doveadm_print_header("root", "Quota name", 0);
+	doveadm_print_header("type", "Type", 0);
+	doveadm_print_header("value", "Value",
+			     DOVEADM_PRINT_HEADER_FLAG_RIGHT_JUSTIFY);
+	doveadm_print_header("limit", "Limit",
+			     DOVEADM_PRINT_HEADER_FLAG_RIGHT_JUSTIFY);
+	doveadm_print_header("percent", "%",
+			     DOVEADM_PRINT_HEADER_FLAG_RIGHT_JUSTIFY);
+}
+
+static struct doveadm_mail_cmd_context *
+cmd_quota_get_alloc(void)
+{
+	struct doveadm_mail_cmd_context *ctx;
+
+	ctx = doveadm_mail_cmd_alloc(struct doveadm_mail_cmd_context);
+	ctx->v.run = cmd_quota_get_run;
+	ctx->v.init = cmd_quota_get_init;
+	doveadm_print_init(DOVEADM_PRINT_TYPE_TABLE);
+	return ctx;
+}
+
+static int
+cmd_quota_recalc_run(struct doveadm_mail_cmd_context *ctx ATTR_UNUSED,
+		     struct mail_user *user)
+{
+	struct quota_user *quser = QUOTA_USER_CONTEXT(user);
+	struct quota_root *const *root;
+	struct quota_transaction_context trans;
+
+	if (quser == NULL) {
+		i_error("Quota not enabled");
+		doveadm_mail_failed_error(ctx, MAIL_ERROR_NOTFOUND);
+		return -1;
+	}
+
+	i_zero(&trans);
+	trans.quota = quser->quota;
+	trans.recalculate = QUOTA_RECALCULATE_FORCED;
+
+	array_foreach(&quser->quota->roots, root) {
+		const char *error;
+		if ((*root)->backend.v.update(*root, &trans, &error) < 0)
+			i_error("Recalculating quota failed: %s", error);
+		if ((*root)->backend.v.flush != NULL)
+			(*root)->backend.v.flush(*root);
+	}
+	return 0;
+}
+
+static struct doveadm_mail_cmd_context *
+cmd_quota_recalc_alloc(void)
+{
+	struct doveadm_mail_cmd_context *ctx;
+
+	ctx = doveadm_mail_cmd_alloc(struct doveadm_mail_cmd_context);
+	ctx->v.run = cmd_quota_recalc_run;
+	return ctx;
+}
+
+static struct doveadm_cmd_ver2 quota_commands[] = {
+	{
+		.name = "quota get",
+		.usage = "",
+		.mail_cmd = cmd_quota_get_alloc,
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_MAIL_COMMON
+DOVEADM_CMD_PARAMS_END
+	},
+	{
+		.name = "quota recalc",
+		.usage = "",
+		.mail_cmd = cmd_quota_recalc_alloc,
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_MAIL_COMMON
+DOVEADM_CMD_PARAMS_END
+	}
+};
+
+void doveadm_quota_plugin_init(struct module *module ATTR_UNUSED)
+{
+	unsigned int i;
+
+	for (i = 0; i < N_ELEMENTS(quota_commands); i++)
+		doveadm_cmd_register_ver2(&quota_commands[i]);
+}
+
+void doveadm_quota_plugin_deinit(void)
+{
+}
diff --git a/src/plugins/quota/quota-count.c b/src/plugins/quota/quota-count.c
new file mode 100644
index 0000000..00e25e6
--- /dev/null
+++ b/src/plugins/quota/quota-count.c
@@ -0,0 +1,400 @@
+/* Copyright (c) 2006-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "mailbox-list-iter.h"
+#include "quota-private.h"
+
+struct count_quota_root {
+	struct quota_root root;
+
+	struct timeval cache_timeval;
+	uint64_t cached_bytes, cached_count;
+};
+
+struct quota_mailbox_iter {
+	struct quota_root *root;
+	struct mail_namespace *ns;
+	unsigned int ns_idx;
+	struct mailbox_list_iterate_context *iter;
+	struct mailbox_info info;
+	const char *error;
+};
+
+extern struct quota_backend quota_backend_count;
+
+static int
+quota_count_mailbox(struct quota_root *root, struct mail_namespace *ns,
+		    const char *vname, uint64_t *bytes, uint64_t *count,
+		    enum quota_get_result *error_result_r,
+		    const char **error_r)
+{
+	struct quota_rule *rule;
+	struct mailbox *box;
+	struct mailbox_metadata metadata;
+	struct mailbox_status status;
+	enum mail_error error;
+	const char *errstr;
+	int ret;
+
+	rule = quota_root_rule_find(root->set, vname);
+	if (rule != NULL && rule->ignore) {
+		/* mailbox not included in quota */
+		return 0;
+	}
+
+	box = mailbox_alloc(ns->list, vname, MAILBOX_FLAG_READONLY);
+	if ((box->storage->class_flags & MAIL_STORAGE_CLASS_FLAG_NOQUOTA) != 0) {
+		/* quota doesn't exist for this mailbox/storage */
+		ret = 0;
+	} else if (mailbox_get_metadata(box, root->quota->set->vsizes ?
+					MAILBOX_METADATA_VIRTUAL_SIZE :
+					MAILBOX_METADATA_PHYSICAL_SIZE,
+					&metadata) < 0 ||
+	    mailbox_get_status(box, STATUS_MESSAGES, &status) < 0) {
+		errstr = mailbox_get_last_internal_error(box, &error);
+		if (error == MAIL_ERROR_TEMP) {
+			*error_r = t_strdup_printf(
+				"Couldn't get size of mailbox %s: %s",
+				vname, errstr);
+			*error_result_r = QUOTA_GET_RESULT_INTERNAL_ERROR;
+			ret = -1;
+		} else if (error == MAIL_ERROR_INUSE) {
+			/* started on background. don't log an error. */
+			*error_r = t_strdup_printf(
+				"Ongoing quota calculation blocked getting size of %s: %s",
+				vname, errstr);
+			*error_result_r = QUOTA_GET_RESULT_BACKGROUND_CALC;
+			ret = -1;
+		} else {
+			/* non-temporary error, e.g. ACLs denied access. */
+			ret = 0;
+		}
+	} else {
+		ret = 0;
+		*bytes += root->quota->set->vsizes ?
+			metadata.virtual_size : metadata.physical_size;
+		*count += status.messages;
+	}
+	mailbox_free(&box);
+	return ret;
+}
+
+static struct quota_mailbox_iter *
+quota_mailbox_iter_begin(struct quota_root *root)
+{
+	struct quota_mailbox_iter *iter;
+
+	iter = i_new(struct quota_mailbox_iter, 1);
+	iter->root = root;
+	iter->error = "";
+	return iter;
+}
+
+static int
+quota_mailbox_iter_deinit(struct quota_mailbox_iter **_iter,
+			  const char **error_r)
+{
+	struct quota_mailbox_iter *iter = *_iter;
+	int ret = *iter->error != '\0' ? -1 : 0;
+
+	*_iter = NULL;
+
+	const char *error2 = "";
+	if (iter->iter != NULL) {
+		if (mailbox_list_iter_deinit(&iter->iter) < 0) {
+			error2 = t_strdup_printf(
+				"Listing namespace '%s' failed: %s",
+				iter->ns->prefix,
+				mailbox_list_get_last_internal_error(iter->ns->list, NULL));
+			ret = -1;
+		}
+	}
+	if (ret < 0) {
+		const char *separator =
+			*iter->error != '\0' && *error2 != '\0' ? " and " : "";
+		*error_r = t_strdup_printf("%s%s%s",
+					   iter->error, separator, error2);
+	}
+	i_free(iter);
+	return ret;
+}
+
+static const struct mailbox_info *
+quota_mailbox_iter_next(struct quota_mailbox_iter *iter)
+{
+	struct mail_namespace *const *namespaces;
+	const struct mailbox_info *info;
+	unsigned int count;
+
+	if (iter->iter == NULL) {
+		namespaces = array_get(&iter->root->quota->namespaces, &count);
+		do {
+			if (iter->ns_idx >= count)
+				return NULL;
+
+			iter->ns = namespaces[iter->ns_idx++];
+		} while (!quota_root_is_namespace_visible(iter->root, iter->ns));
+		iter->iter = mailbox_list_iter_init(iter->ns->list, "*",
+			MAILBOX_LIST_ITER_SKIP_ALIASES |
+			MAILBOX_LIST_ITER_RETURN_NO_FLAGS |
+			MAILBOX_LIST_ITER_NO_AUTO_BOXES);
+	}
+	while ((info = mailbox_list_iter_next(iter->iter)) != NULL) {
+		if ((info->flags & (MAILBOX_NONEXISTENT |
+				    MAILBOX_NOSELECT)) == 0)
+			return info;
+	}
+	if (mailbox_list_iter_deinit(&iter->iter) < 0) {
+		iter->error = t_strdup_printf(
+			"Listing namespace '%s' failed: %s",
+			iter->ns->prefix,
+			mailbox_list_get_last_internal_error(iter->ns->list, NULL));
+	}
+	if (iter->ns->prefix_len > 0 &&
+	    (iter->ns->prefix_len != 6 ||
+	     strncasecmp(iter->ns->prefix, "INBOX", 5) != 0)) {
+		/* if the namespace prefix itself exists, count it also */
+		iter->info.ns = iter->ns;
+		iter->info.vname = t_strndup(iter->ns->prefix,
+					     iter->ns->prefix_len-1);
+		return &iter->info;
+	}
+	/* try the next namespace */
+	return quota_mailbox_iter_next(iter);
+}
+
+int quota_count(struct quota_root *root, uint64_t *bytes_r, uint64_t *count_r,
+		enum quota_get_result *error_result_r, const char **error_r)
+{
+	struct quota_mailbox_iter *iter;
+	const struct mailbox_info *info;
+	const char *error1 = "", *error2 = "";
+	int ret = 1;
+
+	*bytes_r = *count_r = 0;
+	if (root->recounting)
+		return 0;
+	root->recounting = TRUE;
+
+	struct event_reason *reason = event_reason_begin("quota:count");
+
+	iter = quota_mailbox_iter_begin(root);
+	while ((info = quota_mailbox_iter_next(iter)) != NULL) {
+		if (quota_count_mailbox(root, info->ns, info->vname,
+					bytes_r, count_r, error_result_r,
+					&error1) < 0) {
+			ret = -1;
+			break;
+		}
+	}
+	if (quota_mailbox_iter_deinit(&iter, &error2) < 0) {
+		*error_result_r = QUOTA_GET_RESULT_INTERNAL_ERROR;
+		ret = -1;
+	}
+	if (ret < 0) {
+		const char *separator =
+			*error1 != '\0' && *error2 != '\0' ? " and " : "";
+		*error_r = t_strconcat(error1, separator, error2, NULL);
+	}
+	event_reason_end(&reason);
+	root->recounting = FALSE;
+	return ret;
+}
+
+static enum quota_get_result
+quota_count_cached(struct count_quota_root *root,
+		   uint64_t *bytes_r, uint64_t *count_r,
+		   const char **error_r)
+{
+	int ret;
+
+	if (root->cache_timeval.tv_usec == ioloop_timeval.tv_usec &&
+	    root->cache_timeval.tv_sec == ioloop_timeval.tv_sec &&
+	    ioloop_timeval.tv_sec != 0) {
+		*bytes_r = root->cached_bytes;
+		*count_r = root->cached_count;
+		return QUOTA_GET_RESULT_LIMITED;
+	}
+
+	enum quota_get_result error_res;
+	ret = quota_count(&root->root, bytes_r, count_r, &error_res, error_r);
+	if (ret < 0) {
+		return error_res;
+	} else if (ret > 0) {
+		root->cache_timeval = ioloop_timeval;
+		root->cached_bytes = *bytes_r;
+		root->cached_count = *count_r;
+	}
+	return QUOTA_GET_RESULT_LIMITED;
+}
+
+static struct quota_root *count_quota_alloc(void)
+{
+	struct count_quota_root *root;
+
+	root = i_new(struct count_quota_root, 1);
+	return &root->root;
+}
+
+static int count_quota_init(struct quota_root *root, const char *args,
+			    const char **error_r)
+{
+	if (!root->quota->set->vsizes) {
+		*error_r = "quota count backend requires quota_vsizes=yes";
+		return -1;
+	}
+	event_set_append_log_prefix(root->backend.event, "quota-count: ");
+
+	root->auto_updating = TRUE;
+	return quota_root_default_init(root, args, error_r);
+}
+
+static void count_quota_deinit(struct quota_root *_root)
+{
+	i_free(_root);
+}
+
+static const char *const *
+count_quota_root_get_resources(struct quota_root *root ATTR_UNUSED)
+{
+	static const char *resources[] = {
+		QUOTA_NAME_STORAGE_KILOBYTES, QUOTA_NAME_MESSAGES, NULL
+	};
+	return resources;
+}
+
+static enum quota_get_result
+count_quota_get_resource(struct quota_root *_root,
+			 const char *name, uint64_t *value_r,
+			 const char **error_r)
+{
+	struct count_quota_root *root = (struct count_quota_root *)_root;
+	uint64_t bytes, count;
+	enum quota_get_result ret;
+
+	ret = quota_count_cached(root, &bytes, &count, error_r);
+	if (ret <= QUOTA_GET_RESULT_INTERNAL_ERROR)
+		return ret;
+
+	if (strcmp(name, QUOTA_NAME_STORAGE_BYTES) == 0)
+		*value_r = bytes;
+	else if (strcmp(name, QUOTA_NAME_MESSAGES) == 0)
+		*value_r = count;
+	else {
+		*error_r = QUOTA_UNKNOWN_RESOURCE_ERROR_STRING;
+		return QUOTA_GET_RESULT_UNKNOWN_RESOURCE;
+	}
+	return QUOTA_GET_RESULT_LIMITED;
+}
+
+static int quota_count_recalculate_box(struct mailbox *box,
+				       const char **error_r)
+{
+	struct mail_index_transaction *trans;
+	struct mailbox_metadata metadata;
+	struct mailbox_index_vsize vsize_hdr;
+	const char *errstr;
+	enum mail_error error;
+
+	if (mailbox_open(box) < 0) {
+		errstr = mailbox_get_last_internal_error(box, &error);
+		if (error != MAIL_ERROR_TEMP) {
+			/* non-temporary error, e.g. ACLs denied access. */
+			return 0;
+		}
+		*error_r = t_strdup_printf(
+			"Couldn't open mailbox %s: %s", box->vname, errstr);
+		return -1;
+	}
+
+	/* reset the vsize header first */
+	trans = mail_index_transaction_begin(box->view,
+				MAIL_INDEX_TRANSACTION_FLAG_EXTERNAL);
+	i_zero(&vsize_hdr);
+	mail_index_update_header_ext(trans, box->vsize_hdr_ext_id,
+				     0, &vsize_hdr, sizeof(vsize_hdr));
+	if (mail_index_transaction_commit(&trans) < 0) {
+		*error_r = t_strdup_printf(
+			"Couldn't commit mail index transaction for %s: %s",
+			box->vname,
+			mail_index_get_error_message(box->view->index));
+		return -1;
+	}
+	/* getting the vsize now forces its recalculation */
+	if (mailbox_get_metadata(box, MAILBOX_METADATA_VIRTUAL_SIZE,
+				 &metadata) < 0) {
+		*error_r = t_strdup_printf(
+			"Couldn't get mailbox %s vsize: %s", box->vname,
+			mailbox_get_last_internal_error(box, NULL));
+		return -1;
+	}
+	/* call sync to write the change to mailbox list index */
+	if (mailbox_sync(box, MAILBOX_SYNC_FLAG_FAST) < 0) {
+		*error_r = t_strdup_printf(
+			"Couldn't sync mailbox %s: %s", box->vname,
+			mailbox_get_last_internal_error(box, NULL));
+		return -1;
+	}
+	return 0;
+}
+
+static int quota_count_recalculate(struct quota_root *root,
+				   const char **error_r)
+{
+	struct event_reason *reason;
+	struct quota_mailbox_iter *iter;
+	const struct mailbox_info *info;
+	struct mailbox *box;
+	int ret = 0;
+	const char *error1 = "", *error2 = "";
+
+	reason = event_reason_begin("quota:recalculate");
+
+	iter = quota_mailbox_iter_begin(root);
+	while ((info = quota_mailbox_iter_next(iter)) != NULL) {
+		box = mailbox_alloc(info->ns->list, info->vname, 0);
+		if (quota_count_recalculate_box(box, &error1) < 0)
+			ret = -1;
+		mailbox_free(&box);
+	}
+	if (quota_mailbox_iter_deinit(&iter, &error2) < 0)
+		ret = -1;
+	if (ret < 0) {
+		const char *separator =
+			*error1 != '\0' && *error2 != '\0' ? " and " : "";
+		*error_r = t_strdup_printf(
+			"quota-count: recalculate failed: %s%s%s",
+			error1, separator, error2);
+	}
+	event_reason_end(&reason);
+	return ret;
+}
+
+static int
+count_quota_update(struct quota_root *root,
+		   struct quota_transaction_context *ctx,
+		   const char **error_r)
+{
+	struct count_quota_root *croot = (struct count_quota_root *)root;
+
+	croot->cache_timeval.tv_sec = 0;
+	if (ctx->recalculate == QUOTA_RECALCULATE_FORCED) {
+		if (quota_count_recalculate(root, error_r) < 0)
+			return -1;
+	}
+	return 0;
+}
+
+struct quota_backend quota_backend_count = {
+	.name = "count",
+
+	.v = {
+		.alloc = count_quota_alloc,
+		.init = count_quota_init,
+		.deinit = count_quota_deinit,
+		.get_resources = count_quota_root_get_resources,
+		.get_resource = count_quota_get_resource,
+		.update = count_quota_update,
+	}
+};
diff --git a/src/plugins/quota/quota-dict.c b/src/plugins/quota/quota-dict.c
new file mode 100644
index 0000000..02e444a
--- /dev/null
+++ b/src/plugins/quota/quota-dict.c
@@ -0,0 +1,269 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "str.h"
+#include "dict.h"
+#include "mail-user.h"
+#include "mail-namespace.h"
+#include "quota-private.h"
+
+
+#define DICT_QUOTA_CURRENT_PATH DICT_PATH_PRIVATE"quota/"
+#define DICT_QUOTA_CURRENT_BYTES_PATH DICT_QUOTA_CURRENT_PATH"storage"
+#define DICT_QUOTA_CURRENT_COUNT_PATH DICT_QUOTA_CURRENT_PATH"messages"
+
+struct dict_quota_root {
+	struct quota_root root;
+	struct dict *dict;
+	struct timeout *to_update;
+	bool disable_unset;
+};
+
+extern struct quota_backend quota_backend_dict;
+
+static struct quota_root *dict_quota_alloc(void)
+{
+	struct dict_quota_root *root;
+
+	root = i_new(struct dict_quota_root, 1);
+	return &root->root;
+}
+
+static void handle_nounset_param(struct quota_root *_root, const char *param_value ATTR_UNUSED)
+{
+	((struct dict_quota_root *)_root)->disable_unset = TRUE;
+}
+
+static int dict_quota_init(struct quota_root *_root, const char *args,
+			   const char **error_r)
+{
+	struct dict_quota_root *root = (struct dict_quota_root *)_root;
+	struct dict_settings set;
+	const char *username, *p, *error;
+
+	event_set_append_log_prefix(_root->backend.event, "quota-dict: ");
+
+	const struct quota_param_parser dict_params[] = {
+		{.param_name = "no-unset", .param_handler = handle_nounset_param},
+		quota_param_hidden, quota_param_ignoreunlimited, quota_param_noenforcing, quota_param_ns,
+		{.param_name = NULL}
+	};
+
+	p = args == NULL ? NULL : strchr(args, ':');
+	if (p == NULL) {
+		*error_r = "URI missing from parameters";
+		return -1;
+	}
+
+	username = t_strdup_until(args, p);
+	args = p+1;
+
+	if (quota_parse_parameters(_root, &args, error_r, dict_params, FALSE) < 0)
+		i_unreached();
+
+	if (*username == '\0')
+		username = _root->quota->user->username;
+
+	e_debug(_root->backend.event, "user=%s, uri=%s, noenforcing=%d",
+		username, args, _root->no_enforcing ? 1 : 0);
+
+	/* FIXME: we should use 64bit integer as datatype instead but before
+	   it can actually be used don't bother */
+	i_zero(&set);
+	set.base_dir = _root->quota->user->set->base_dir;
+	set.event_parent = _root->quota->user->event;
+	if (dict_init(args, &set, &root->dict, &error) < 0) {
+		*error_r = t_strdup_printf("dict_init(%s) failed: %s", args, error);
+		return -1;
+	}
+	return 0;
+}
+
+static void dict_quota_deinit(struct quota_root *_root)
+{
+	struct dict_quota_root *root = (struct dict_quota_root *)_root;
+
+	i_assert(root->to_update == NULL);
+
+	if (root->dict != NULL) {
+		dict_wait(root->dict);
+		dict_deinit(&root->dict);
+	}
+	i_free(root);
+}
+
+static const char *const *
+dict_quota_root_get_resources(struct quota_root *root ATTR_UNUSED)
+{
+	static const char *resources[] = {
+		QUOTA_NAME_STORAGE_KILOBYTES, QUOTA_NAME_MESSAGES, NULL
+	};
+
+	return resources;
+}
+
+static enum quota_get_result
+dict_quota_count(struct dict_quota_root *root,
+		 bool want_bytes, uint64_t *value_r,
+		 const char **error_r)
+{
+	struct dict_transaction_context *dt;
+	struct event_reason *reason;
+	uint64_t bytes, count;
+	enum quota_get_result error_res;
+	const struct dict_op_settings *set;
+
+	reason = event_reason_begin("quota:recalculate");
+	int ret = quota_count(&root->root, &bytes, &count, &error_res, error_r);
+	event_reason_end(&reason);
+	if (ret < 0)
+		return error_res;
+
+	set = mail_user_get_dict_op_settings(root->root.quota->user);
+	dt = dict_transaction_begin(root->dict, set);
+	/* these unsets are mainly necessary for pgsql, because its
+	   trigger otherwise increases quota without deleting it.
+	   but some people with other databases want to store the
+	   quota usage among other data in the same row, which
+	   shouldn't be deleted. */
+	if (!root->disable_unset) {
+		dict_unset(dt, DICT_QUOTA_CURRENT_BYTES_PATH);
+		dict_unset(dt, DICT_QUOTA_CURRENT_COUNT_PATH);
+	}
+	dict_set(dt, DICT_QUOTA_CURRENT_BYTES_PATH, dec2str(bytes));
+	dict_set(dt, DICT_QUOTA_CURRENT_COUNT_PATH, dec2str(count));
+
+	e_debug(root->root.backend.event, "Quota recalculated: "
+		"count=%"PRIu64" bytes=%"PRIu64, count, bytes);
+
+	dict_transaction_commit_async_nocallback(&dt);
+	*value_r = want_bytes ? bytes : count;
+	return QUOTA_GET_RESULT_LIMITED;
+}
+
+static enum quota_get_result
+dict_quota_get_resource(struct quota_root *_root,
+			const char *name, uint64_t *value_r,
+			const char **error_r)
+{
+	struct dict_quota_root *root = (struct dict_quota_root *)_root;
+	bool want_bytes;
+	int ret;
+	const struct dict_op_settings *set;
+
+	if (strcmp(name, QUOTA_NAME_STORAGE_BYTES) == 0)
+		want_bytes = TRUE;
+	else if (strcmp(name, QUOTA_NAME_MESSAGES) == 0)
+		want_bytes = FALSE;
+	else {
+		*error_r = QUOTA_UNKNOWN_RESOURCE_ERROR_STRING;
+		return QUOTA_GET_RESULT_UNKNOWN_RESOURCE;
+	}
+
+	set = mail_user_get_dict_op_settings(root->root.quota->user);
+	const char *key, *value, *error;
+	key = want_bytes ? DICT_QUOTA_CURRENT_BYTES_PATH :
+		DICT_QUOTA_CURRENT_COUNT_PATH;
+	ret = dict_lookup(root->dict, set, unsafe_data_stack_pool,
+			  key, &value, &error);
+	if (ret < 0) {
+		*error_r = t_strdup_printf(
+			"dict_lookup(%s) failed: %s", key, error);
+		*value_r = 0;
+		return QUOTA_GET_RESULT_INTERNAL_ERROR;
+	}
+
+	intmax_t tmp;
+	/* recalculate quota if it's negative or if it wasn't found */
+	if (ret == 0 || str_to_intmax(value, &tmp) < 0)
+		tmp = -1;
+	if (tmp >= 0)
+		*value_r = tmp;
+	else
+		return dict_quota_count(root, want_bytes, value_r, error_r);
+	return QUOTA_GET_RESULT_LIMITED;
+}
+
+static void dict_quota_recalc_timeout(struct dict_quota_root *root)
+{
+	uint64_t value;
+	const char *error;
+
+	timeout_remove(&root->to_update);
+	if (dict_quota_count(root, TRUE, &value, &error)
+	    <= QUOTA_GET_RESULT_INTERNAL_ERROR)
+		e_error(root->root.backend.event,
+			"Recalculation failed: %s", error);
+}
+
+static void dict_quota_update_callback(const struct dict_commit_result *result,
+				       struct dict_quota_root *root)
+{
+	if (result->ret == 0) {
+		/* row doesn't exist, need to recalculate it */
+		if (root->to_update == NULL)
+			root->to_update = timeout_add_short(0, dict_quota_recalc_timeout, root);
+	} else if (result->ret < 0) {
+		e_error(root->root.backend.event,
+			"Quota update failed: %s "
+			"- Quota is now desynced", result->error);
+	}
+}
+
+static int
+dict_quota_update(struct quota_root *_root, 
+		  struct quota_transaction_context *ctx,
+		  const char **error_r)
+{
+	struct dict_quota_root *root = (struct dict_quota_root *) _root;
+	struct dict_transaction_context *dt;
+	uint64_t value;
+	const struct dict_op_settings *set;
+
+	if (ctx->recalculate != QUOTA_RECALCULATE_DONT) {
+		if (dict_quota_count(root, TRUE, &value, error_r)
+		    <= QUOTA_GET_RESULT_INTERNAL_ERROR)
+			return -1;
+	} else {
+		set = mail_user_get_dict_op_settings(root->root.quota->user);
+		dt = dict_transaction_begin(root->dict, set);
+		if (ctx->bytes_used != 0) {
+			dict_atomic_inc(dt, DICT_QUOTA_CURRENT_BYTES_PATH,
+					ctx->bytes_used);
+		}
+		if (ctx->count_used != 0) {
+			dict_atomic_inc(dt, DICT_QUOTA_CURRENT_COUNT_PATH,
+					ctx->count_used);
+		}
+		dict_transaction_no_slowness_warning(dt);
+		dict_transaction_commit_async(&dt, dict_quota_update_callback,
+					      root);
+	}
+	return 0;
+}
+
+static void dict_quota_flush(struct quota_root *_root)
+{
+	struct dict_quota_root *root = (struct dict_quota_root *)_root;
+
+	dict_wait(root->dict);
+	if (root->to_update != NULL) {
+		dict_quota_recalc_timeout(root);
+		dict_wait(root->dict);
+	}
+}
+
+struct quota_backend quota_backend_dict = {
+	.name = "dict",
+
+	.v = {
+		.alloc = dict_quota_alloc,
+		.init = dict_quota_init,
+		.deinit = dict_quota_deinit,
+		.get_resources = dict_quota_root_get_resources,
+		.get_resource = dict_quota_get_resource,
+		.update = dict_quota_update,
+		.flush = dict_quota_flush,
+	}
+};
diff --git a/src/plugins/quota/quota-dirsize.c b/src/plugins/quota/quota-dirsize.c
new file mode 100644
index 0000000..a8305d8
--- /dev/null
+++ b/src/plugins/quota/quota-dirsize.c
@@ -0,0 +1,232 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+/* Quota reporting based on simply summing sizes of all files in mailbox
+   together. */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "quota-private.h"
+
+#include <unistd.h>
+#include <dirent.h>
+#include <sys/stat.h>
+
+struct quota_count_path {
+	const char *path;
+	bool is_file;
+};
+ARRAY_DEFINE_TYPE(quota_count_path, struct quota_count_path);
+
+extern struct quota_backend quota_backend_dirsize;
+
+static struct quota_root *dirsize_quota_alloc(void)
+{
+	return i_new(struct quota_root, 1);
+}
+
+static int dirsize_quota_init(struct quota_root *root, const char *args,
+			      const char **error_r)
+{
+	root->auto_updating = TRUE;
+	event_set_append_log_prefix(root->backend.event, "quota-dirsize: ");
+	return quota_root_default_init(root, args, error_r);
+}
+
+static void dirsize_quota_deinit(struct quota_root *_root)
+{
+	i_free(_root);
+}
+
+static const char *const *
+dirsize_quota_root_get_resources(struct quota_root *root ATTR_UNUSED)
+{
+	static const char *resources[] = { QUOTA_NAME_STORAGE_KILOBYTES, NULL };
+
+	return resources;
+}
+
+static int get_dir_usage(const char *dir, uint64_t *value,
+			 const char **error_r)
+{
+	DIR *dirp;
+	string_t *path;
+	struct dirent *d;
+	struct stat st;
+	unsigned int path_pos;
+        int ret;
+
+	dirp = opendir(dir);
+	if (dirp == NULL) {
+		if (errno == ENOENT)
+			return 0;
+
+		*error_r = t_strdup_printf("opendir(%s) failed: %m", dir);
+		return -1;
+	}
+
+	path = t_str_new(128);
+	str_append(path, dir);
+	str_append_c(path, '/');
+	path_pos = str_len(path);
+
+	ret = 0;
+	while ((d = readdir(dirp)) != NULL) {
+		if (d->d_name[0] == '.' &&
+		    (d->d_name[1] == '\0' ||
+		     (d->d_name[1] == '.' && d->d_name[2] == '\0'))) {
+			/* skip . and .. */
+			continue;
+		}
+
+		str_truncate(path, path_pos);
+		str_append(path, d->d_name);
+
+		if (lstat(str_c(path), &st) < 0) {
+			if (errno == ENOENT)
+				continue;
+
+			*error_r = t_strdup_printf("lstat(%s) failed: %m", dir);
+			ret = -1;
+			break;
+		} else if (S_ISDIR(st.st_mode)) {
+			if (get_dir_usage(str_c(path), value, error_r) < 0) {
+				ret = -1;
+				break;
+			}
+		} else {
+			*value += st.st_size;
+		}
+	}
+
+	(void)closedir(dirp);
+	return ret;
+}
+
+static int get_usage(const char *path, bool is_file, uint64_t *value_r,
+		     const char **error_r)
+{
+	struct stat st;
+
+	if (is_file) {
+		if (lstat(path, &st) < 0) {
+			if (errno == ENOENT)
+				return 0;
+
+			*error_r = t_strdup_printf("lstat(%s) failed: %m", path);
+			return -1;
+		}
+		*value_r += st.st_size;
+	} else {
+		if (get_dir_usage(path, value_r, error_r) < 0)
+			return -1;
+	}
+	return 0;
+}
+
+static void quota_count_path_add(ARRAY_TYPE(quota_count_path) *paths,
+				 const char *path, bool is_file)
+{
+	struct quota_count_path *count_path;
+	unsigned int i, count;
+	size_t path_len;
+
+	path_len = strlen(path);
+	count_path = array_get_modifiable(paths, &count);
+	for (i = 0; i < count; ) {
+		if (strncmp(count_path[i].path, path,
+			    strlen(count_path[i].path)) == 0) {
+			/* this path has already been counted */
+			return;
+		}
+		if (strncmp(count_path[i].path, path, path_len) == 0 &&
+		    count_path[i].path[path_len] == '/') {
+			/* the new path contains the existing path.
+			   drop it and see if there are more to drop. */
+			array_delete(paths, i, 1);
+			count_path = array_get_modifiable(paths, &count);
+		} else {
+			i++;
+		}
+	}
+
+	count_path = array_append_space(paths);
+	count_path->path = t_strdup(path);
+	count_path->is_file = is_file;
+}
+
+static int
+get_quota_root_usage(struct quota_root *root, uint64_t *value_r,
+		     const char **error_r)
+{
+	struct mail_namespace *const *namespaces;
+	ARRAY_TYPE(quota_count_path) paths;
+	const struct quota_count_path *count_paths;
+	unsigned int i, count;
+	const char *path;
+	bool is_file;
+
+	t_array_init(&paths, 8);
+	namespaces = array_get(&root->quota->namespaces, &count);
+	for (i = 0; i < count; i++) {
+		if (!quota_root_is_namespace_visible(root, namespaces[i]))
+			continue;
+
+		is_file = mail_storage_is_mailbox_file(namespaces[i]->storage);
+		if (mailbox_list_get_root_path(namespaces[i]->list,
+					       MAILBOX_LIST_PATH_TYPE_DIR, &path))
+			quota_count_path_add(&paths, path, FALSE);
+
+		/* INBOX may be in different path. */
+		if (mailbox_list_get_path(namespaces[i]->list, "INBOX",
+					  MAILBOX_LIST_PATH_TYPE_MAILBOX, &path) > 0)
+			quota_count_path_add(&paths, path, is_file);
+	}
+
+	/* now sum up the found paths */
+	*value_r = 0;
+	count_paths = array_get(&paths, &count);
+	for (i = 0; i < count; i++) {
+		if (get_usage(count_paths[i].path, count_paths[i].is_file,
+			      value_r, error_r) < 0)
+			return -1;
+	}
+	return 0;
+}
+
+static enum quota_get_result
+dirsize_quota_get_resource(struct quota_root *_root, const char *name,
+			   uint64_t *value_r, const char **error_r)
+{
+	int ret;
+
+	if (strcasecmp(name, QUOTA_NAME_STORAGE_BYTES) != 0) {
+		*error_r = QUOTA_UNKNOWN_RESOURCE_ERROR_STRING;
+		return QUOTA_GET_RESULT_UNKNOWN_RESOURCE;
+	}
+
+	ret = get_quota_root_usage(_root, value_r, error_r);
+
+	return ret < 0 ? QUOTA_GET_RESULT_INTERNAL_ERROR : QUOTA_GET_RESULT_LIMITED;
+}
+
+static int 
+dirsize_quota_update(struct quota_root *root ATTR_UNUSED, 
+		     struct quota_transaction_context *ctx ATTR_UNUSED,
+		     const char **error_r ATTR_UNUSED)
+{
+	return 0;
+}
+
+struct quota_backend quota_backend_dirsize = {
+	.name = "dirsize",
+
+	.v = {
+		.alloc = dirsize_quota_alloc,
+		.init = dirsize_quota_init,
+		.deinit = dirsize_quota_deinit,
+		.get_resources = dirsize_quota_root_get_resources,
+		.get_resource = dirsize_quota_get_resource,
+		.update = dirsize_quota_update,
+	}
+};
diff --git a/src/plugins/quota/quota-fs.c b/src/plugins/quota/quota-fs.c
new file mode 100644
index 0000000..57620c1
--- /dev/null
+++ b/src/plugins/quota/quota-fs.c
@@ -0,0 +1,970 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+/* Only for reporting filesystem quota */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "hostpid.h"
+#include "mountpoint.h"
+#include "quota-private.h"
+#include "quota-fs.h"
+
+#ifdef HAVE_FS_QUOTA
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#ifdef HAVE_LINUX_DQBLK_XFS_H
+#  include <linux/dqblk_xfs.h>
+#  define HAVE_XFS_QUOTA
+#elif defined (HAVE_XFS_XQM_H)
+#  include <xfs/xqm.h> /* CentOS 4.x at least uses this */
+#  define HAVE_XFS_QUOTA
+#endif
+
+#ifdef HAVE_RQUOTA
+#  include "rquota.h"
+#  define RQUOTA_GETQUOTA_TIMEOUT_SECS 10
+#endif
+
+#ifndef DEV_BSIZE
+#  ifdef DQBSIZE
+#    define DEV_BSIZE DQBSIZE /* AIX */
+#  else
+#    define DEV_BSIZE 512
+#  endif
+#endif
+
+#ifdef HAVE_STRUCT_DQBLK_CURSPACE
+#  define dqb_curblocks dqb_curspace
+#endif
+
+/* Very old sys/quota.h doesn't define _LINUX_QUOTA_VERSION at all, which means
+   it supports only v1 quota. However, new sys/quota.h (glibc 2.25) removes
+   support for v1 entirely and again it doesn't define it. I guess we can just
+   assume v2 now, and if someone still wants v1 support they can add
+   -D_LINUX_QUOTA_VERSION=1 to CFLAGS. */
+#ifndef _LINUX_QUOTA_VERSION
+#  define _LINUX_QUOTA_VERSION 2
+#endif
+
+#define mount_type_is_nfs(mount) \
+	(strcmp((mount)->type, "nfs") == 0 || \
+	 strcmp((mount)->type, "nfs4") == 0)
+
+struct fs_quota_mountpoint {
+	int refcount;
+
+	char *mount_path;
+	char *device_path;
+	char *type;
+	unsigned int block_size;
+
+#ifdef FS_QUOTA_SOLARIS
+	int fd;
+	char *path;
+#endif
+};
+
+struct fs_quota_root {
+	struct quota_root root;
+	char *storage_mount_path;
+
+	uid_t uid;
+	gid_t gid;
+	struct fs_quota_mountpoint *mount;
+
+	bool inode_per_mail:1;
+	bool user_disabled:1;
+	bool group_disabled:1;
+#ifdef FS_QUOTA_NETBSD
+	struct quotahandle *qh;
+#endif
+};
+
+extern struct quota_backend quota_backend_fs;
+
+static struct quota_root *fs_quota_alloc(void)
+{
+	struct fs_quota_root *root;
+
+	root = i_new(struct fs_quota_root, 1);
+	root->uid = geteuid();
+	root->gid = getegid();
+
+	return &root->root;
+}
+
+static void handle_user_param(struct quota_root *_root, const char *param_value ATTR_UNUSED)
+{
+	((struct fs_quota_root *)_root)->group_disabled = TRUE;
+}
+
+static void handle_group_param(struct quota_root *_root, const char *param_value ATTR_UNUSED)
+{
+	((struct fs_quota_root *)_root)->user_disabled = TRUE;
+}
+
+static void handle_inode_param(struct quota_root *_root, const char *param_value ATTR_UNUSED)
+{
+	((struct fs_quota_root *)_root)->inode_per_mail = TRUE;
+}
+
+static void handle_mount_param(struct quota_root *_root, const char *param_value)
+{
+	struct fs_quota_root *root = (struct fs_quota_root *)_root;
+	i_free(root->storage_mount_path);
+	root->storage_mount_path = i_strdup(param_value);
+}
+
+static int fs_quota_init(struct quota_root *_root, const char *args,
+			 const char **error_r)
+{
+	const struct quota_param_parser fs_params[] = {
+		{.param_name = "user", .param_handler = handle_user_param},
+		{.param_name = "group", .param_handler = handle_group_param},
+		{.param_name = "mount=", .param_handler = handle_mount_param},
+		{.param_name = "inode_per_mail", .param_handler = handle_inode_param},
+		quota_param_hidden, quota_param_noenforcing, quota_param_ns,
+		{.param_name = NULL}
+	};
+
+	event_set_append_log_prefix(_root->backend.event, "quota-fs: ");
+
+	if (quota_parse_parameters(_root, &args, error_r, fs_params, TRUE) < 0)
+		return -1;
+	_root->auto_updating = TRUE;
+	return 0;
+}
+
+static void fs_quota_mountpoint_free(struct fs_quota_mountpoint *mount)
+{
+	if (--mount->refcount > 0)
+		return;
+
+#ifdef FS_QUOTA_SOLARIS
+	i_close_fd_path(&mount->fd, mount->path);
+	i_free(mount->path);
+#endif
+
+	i_free(mount->device_path);
+	i_free(mount->mount_path);
+	i_free(mount->type);
+	i_free(mount);
+}
+
+static void fs_quota_deinit(struct quota_root *_root)
+{
+	struct fs_quota_root *root = (struct fs_quota_root *)_root;
+
+	if (root->mount != NULL)
+		fs_quota_mountpoint_free(root->mount);
+	i_free(root->storage_mount_path);
+	i_free(root);
+}
+
+static struct fs_quota_mountpoint *fs_quota_mountpoint_get(const char *dir)
+{
+	struct fs_quota_mountpoint *mount;
+	struct mountpoint point;
+	int ret;
+
+	ret = mountpoint_get(dir, default_pool, &point);
+	if (ret <= 0)
+		return NULL;
+
+	mount = i_new(struct fs_quota_mountpoint, 1);
+	mount->refcount = 1;
+	mount->device_path = point.device_path;
+	mount->mount_path = point.mount_path;
+	mount->type = point.type;
+	mount->block_size = point.block_size;
+#ifdef FS_QUOTA_SOLARIS
+	mount->fd = -1;
+#endif
+
+	if (mount_type_is_nfs(mount)) {
+		if (strchr(mount->device_path, ':') == NULL) {
+			e_error(quota_backend_fs.event,
+				"%s is not a valid NFS device path",
+				mount->device_path);
+			fs_quota_mountpoint_free(mount);
+			return NULL;
+		}
+	}
+	return mount;
+}
+
+#define QUOTA_ROOT_MATCH(root, mount) \
+	((root)->root.backend.name == quota_backend_fs.name && \
+	 ((root)->storage_mount_path == NULL || \
+	  strcmp((root)->storage_mount_path, (mount)->mount_path) == 0))
+
+static struct fs_quota_root *
+fs_quota_root_find_mountpoint(struct quota *quota,
+			      const struct fs_quota_mountpoint *mount)
+{
+	struct quota_root *const *roots;
+	struct fs_quota_root *empty = NULL;
+	unsigned int i, count;
+
+	roots = array_get(&quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		struct fs_quota_root *root = (struct fs_quota_root *)roots[i];
+		if (QUOTA_ROOT_MATCH(root, mount)) {
+			if (root->mount == NULL)
+				empty = root;
+			else if (strcmp(root->mount->mount_path,
+					mount->mount_path) == 0)
+				return root;
+		}
+	}
+	return empty;
+}
+
+static void
+fs_quota_mount_init(struct fs_quota_root *root,
+		    struct fs_quota_mountpoint *mount, const char *dir)
+{
+	struct quota_root *const *roots;
+	unsigned int i, count;
+
+#ifdef FS_QUOTA_SOLARIS
+#ifdef HAVE_RQUOTA
+	if (mount_type_is_nfs(mount)) {
+		/* using rquota for this mount */
+	} else
+#endif
+	if (mount->path == NULL) {
+		mount->path = i_strconcat(mount->mount_path, "/quotas", NULL);
+		mount->fd = open(mount->path, O_RDONLY);
+		if (mount->fd == -1 && errno != ENOENT)
+			e_error(root->root.backend.event,
+				"open(%s) failed: %m", mount->path);
+	}
+#endif
+	root->mount = mount;
+
+	e_debug(root->root.backend.event, "fs quota add mailbox dir = %s", dir);
+	e_debug(root->root.backend.event, "fs quota block device = %s", mount->device_path);
+	e_debug(root->root.backend.event, "fs quota mount point = %s", mount->mount_path);
+	e_debug(root->root.backend.event, "fs quota mount type = %s", mount->type);
+
+	/* if there are more unused quota roots, copy this mount to them */
+	roots = array_get(&root->root.quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		root = (struct fs_quota_root *)roots[i];
+		if (QUOTA_ROOT_MATCH(root, mount) && root->mount == NULL) {
+			mount->refcount++;
+			root->mount = mount;
+		}
+	}
+}
+
+static void fs_quota_add_missing_mounts(struct quota *quota)
+{
+	struct fs_quota_mountpoint *mount;
+	struct quota_root *const *roots;
+	unsigned int i, count;
+
+	roots = array_get(&quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		struct fs_quota_root *root = (struct fs_quota_root *)roots[i];
+
+		if (root->root.backend.name != quota_backend_fs.name ||
+		    root->storage_mount_path == NULL || root->mount != NULL)
+			continue;
+
+		mount = fs_quota_mountpoint_get(root->storage_mount_path);
+		if (mount != NULL) {
+			fs_quota_mount_init(root, mount,
+					    root->storage_mount_path);
+		}
+	}
+}
+
+static void fs_quota_namespace_added(struct quota *quota,
+				     struct mail_namespace *ns)
+{
+	struct fs_quota_mountpoint *mount;
+	struct fs_quota_root *root;
+	const char *dir;
+
+	if (!mailbox_list_get_root_path(ns->list, MAILBOX_LIST_PATH_TYPE_MAILBOX,
+					&dir))
+		mount = NULL;
+	else
+		mount = fs_quota_mountpoint_get(dir);
+	if (mount != NULL) {
+		root = fs_quota_root_find_mountpoint(quota, mount);
+		if (root != NULL && root->mount == NULL)
+			fs_quota_mount_init(root, mount, dir);
+		else
+			fs_quota_mountpoint_free(mount);
+	}
+
+	/* we would actually want to do this only once after all quota roots
+	   are created, but there's no way to do this right now */
+	fs_quota_add_missing_mounts(quota);
+}
+
+static const char *const *
+fs_quota_root_get_resources(struct quota_root *_root)
+{
+	struct fs_quota_root *root = (struct fs_quota_root *)_root;
+	static const char *resources_kb[] = {
+		QUOTA_NAME_STORAGE_KILOBYTES,
+		NULL
+	};
+	static const char *resources_kb_messages[] = {
+		QUOTA_NAME_STORAGE_KILOBYTES,
+		QUOTA_NAME_MESSAGES,
+		NULL
+	};
+
+	return root->inode_per_mail ? resources_kb_messages : resources_kb;
+}
+
+#if defined(FS_QUOTA_LINUX) || defined(FS_QUOTA_BSDAIX) || \
+    defined(FS_QUOTA_NETBSD) || defined(HAVE_RQUOTA)
+static void fs_quota_root_disable(struct fs_quota_root *root, bool group)
+{
+	if (group)
+		root->group_disabled = TRUE;
+	else
+		root->user_disabled = TRUE;
+}
+#endif
+
+#ifdef HAVE_RQUOTA
+static void
+rquota_get_result(const rquota *rq,
+		  uint64_t *bytes_value_r, uint64_t *bytes_limit_r,
+		  uint64_t *count_value_r, uint64_t *count_limit_r)
+{
+	/* use soft limits if they exist, fallback to hard limits */
+
+	/* convert the results from blocks to bytes */
+	*bytes_value_r = (uint64_t)rq->rq_curblocks *
+		(uint64_t)rq->rq_bsize;
+	if (rq->rq_bsoftlimit != 0) {
+		*bytes_limit_r = (uint64_t)rq->rq_bsoftlimit *
+			(uint64_t)rq->rq_bsize;
+	} else {
+		*bytes_limit_r = (uint64_t)rq->rq_bhardlimit *
+			(uint64_t)rq->rq_bsize;
+	}
+
+	*count_value_r = rq->rq_curfiles;
+	if (rq->rq_fsoftlimit != 0)
+		*count_limit_r = rq->rq_fsoftlimit;
+	else
+		*count_limit_r = rq->rq_fhardlimit;
+}
+
+static int
+do_rquota_user(struct fs_quota_root *root,
+	       uint64_t *bytes_value_r, uint64_t *bytes_limit_r,
+	       uint64_t *count_value_r, uint64_t *count_limit_r,
+	       const char **error_r)
+{
+	struct getquota_rslt result;
+	struct getquota_args args;
+	struct timeval timeout;
+	enum clnt_stat call_status;
+	CLIENT *cl;
+	struct fs_quota_mountpoint *mount = root->mount;
+	const char *host;
+	char *path;
+
+	path = strchr(mount->device_path, ':');
+	i_assert(path != NULL);
+
+	host = t_strdup_until(mount->device_path, path);
+	path++;
+
+	/* For NFSv4, we send the filesystem path without initial /. Server
+	   prepends proper NFS pseudoroot automatically and uses this for
+	   detection of NFSv4 mounts. */
+	if (strcmp(root->mount->type, "nfs4") == 0) {
+		while (*path == '/')
+			path++;
+	}
+
+	e_debug(root->root.backend.event, "host=%s, path=%s, uid=%s",
+		host, path, dec2str(root->uid));
+
+	/* clnt_create() polls for a while to establish a connection */
+	cl = clnt_create(host, RQUOTAPROG, RQUOTAVERS, "udp");
+	if (cl == NULL) {
+		*error_r = t_strdup_printf(
+			"could not contact RPC service on %s", host);
+		return -1;
+	}
+
+	/* Establish some RPC credentials */
+	auth_destroy(cl->cl_auth);
+	cl->cl_auth = authunix_create_default();
+
+	/* make the rquota call on the remote host */
+	args.gqa_pathp = path;
+	args.gqa_uid = root->uid;
+
+	timeout.tv_sec = RQUOTA_GETQUOTA_TIMEOUT_SECS;
+	timeout.tv_usec = 0;
+	call_status = clnt_call(cl, RQUOTAPROC_GETQUOTA,
+				(xdrproc_t)xdr_getquota_args, (char *)&args,
+				(xdrproc_t)xdr_getquota_rslt, (char *)&result,
+				timeout);
+
+	/* the result has been deserialized, let the client go */
+	auth_destroy(cl->cl_auth);
+	clnt_destroy(cl);
+
+	if (call_status != RPC_SUCCESS) {
+		const char *rpc_error_msg = clnt_sperrno(call_status);
+
+		*error_r = t_strdup_printf(
+			"remote rquota call failed: %s",
+			rpc_error_msg);
+		return -1;
+	}
+
+	switch (result.status) {
+	case Q_OK: {
+		rquota_get_result(&result.getquota_rslt_u.gqr_rquota,
+				  bytes_value_r, bytes_limit_r,
+				  count_value_r, count_limit_r);
+		e_debug(root->root.backend.event, "uid=%s, bytes=%"PRIu64"/%"PRIu64" "
+			"files=%"PRIu64"/%"PRIu64,
+			dec2str(root->uid),
+			*bytes_value_r, *bytes_limit_r,
+			*count_value_r, *count_limit_r);
+		return 1;
+	}
+	case Q_NOQUOTA:
+		e_debug(root->root.backend.event, "uid=%s, limit=unlimited",
+			dec2str(root->uid));
+		fs_quota_root_disable(root, FALSE);
+		return 0;
+	case Q_EPERM:
+		*error_r = "permission denied to rquota service";
+		return -1;
+	default:
+		*error_r = t_strdup_printf(
+			"unrecognized status code (%d) from rquota service",
+			result.status);
+		return -1;
+	}
+}
+
+static int
+do_rquota_group(struct fs_quota_root *root ATTR_UNUSED,
+		uint64_t *bytes_value_r ATTR_UNUSED,
+		uint64_t *bytes_limit_r ATTR_UNUSED,
+		uint64_t *count_value_r ATTR_UNUSED,
+		uint64_t *count_limit_r ATTR_UNUSED,
+		const char **error_r)
+{
+#if defined(EXT_RQUOTAVERS) && defined(GRPQUOTA)
+	struct getquota_rslt result;
+	ext_getquota_args args;
+	struct timeval timeout;
+	enum clnt_stat call_status;
+	CLIENT *cl;
+	struct fs_quota_mountpoint *mount = root->mount;
+	const char *host;
+	char *path;
+
+	path = strchr(mount->device_path, ':');
+	i_assert(path != NULL);
+
+	host = t_strdup_until(mount->device_path, path);
+	path++;
+
+	e_debug(root->root.backend.event, "host=%s, path=%s, gid=%s",
+		host, path, dec2str(root->gid));
+
+	/* clnt_create() polls for a while to establish a connection */
+	cl = clnt_create(host, RQUOTAPROG, EXT_RQUOTAVERS, "udp");
+	if (cl == NULL) {
+		*error_r = t_strdup_printf(
+			"could not contact RPC service on %s (group)", host);
+		return -1;
+	}
+
+	/* Establish some RPC credentials */
+	auth_destroy(cl->cl_auth);
+	cl->cl_auth = authunix_create_default();
+
+	/* make the rquota call on the remote host */
+	args.gqa_pathp = path;
+	args.gqa_id = root->gid;
+	args.gqa_type = GRPQUOTA;
+	timeout.tv_sec = RQUOTA_GETQUOTA_TIMEOUT_SECS;
+	timeout.tv_usec = 0;
+
+	call_status = clnt_call(cl, RQUOTAPROC_GETQUOTA,
+				(xdrproc_t)xdr_ext_getquota_args, (char *)&args,
+				(xdrproc_t)xdr_getquota_rslt, (char *)&result,
+				timeout);
+
+	/* the result has been deserialized, let the client go */
+	auth_destroy(cl->cl_auth);
+	clnt_destroy(cl);
+
+	if (call_status != RPC_SUCCESS) {
+		const char *rpc_error_msg = clnt_sperrno(call_status);
+
+		*error_r = t_strdup_printf(
+			"remote ext rquota call failed: %s", rpc_error_msg);
+		return -1;
+	}
+
+	switch (result.status) {
+	case Q_OK: {
+		rquota_get_result(&result.getquota_rslt_u.gqr_rquota,
+				  bytes_value_r, bytes_limit_r,
+				  count_value_r, count_limit_r);
+		e_debug(root->root.backend.event, "gid=%s, bytes=%"PRIu64"/%"PRIu64" "
+			"files=%"PRIu64"/%"PRIu64,
+			dec2str(root->gid),
+			*bytes_value_r, *bytes_limit_r,
+			*count_value_r, *count_limit_r);
+		return 1;
+	}
+	case Q_NOQUOTA:
+		e_debug(root->root.backend.event, "gid=%s, limit=unlimited",
+			dec2str(root->gid));
+		fs_quota_root_disable(root, TRUE);
+		return 0;
+	case Q_EPERM:
+		*error_r = "permission denied to ext rquota service";
+		return -1;
+	default:
+		*error_r = t_strdup_printf(
+			"unrecognized status code (%d) from ext rquota service",
+			result.status);
+		return -1;
+	}
+#else
+	*error_r = "rquota not compiled with group support";
+	return -1;
+#endif
+}
+#endif
+
+#ifdef FS_QUOTA_LINUX
+static int
+fs_quota_get_linux(struct fs_quota_root *root, bool group,
+		   uint64_t *bytes_value_r, uint64_t *bytes_limit_r,
+		   uint64_t *count_value_r, uint64_t *count_limit_r,
+		   const char **error_r)
+{
+	struct dqblk dqblk;
+	int type, id;
+
+	type = group ? GRPQUOTA : USRQUOTA;
+	id = group ? root->gid : root->uid;
+
+#ifdef HAVE_XFS_QUOTA
+	if (strcmp(root->mount->type, "xfs") == 0) {
+		struct fs_disk_quota xdqblk;
+
+		if (quotactl(QCMD(Q_XGETQUOTA, type),
+			     root->mount->device_path,
+			     id, (caddr_t)&xdqblk) < 0) {
+			if (errno == ESRCH) {
+				fs_quota_root_disable(root, group);
+				return 0;
+			}
+			*error_r = t_strdup_printf(
+				"errno=%d, quotactl(Q_XGETQUOTA, %s) failed: %m",
+				errno, root->mount->device_path);
+			return -1;
+		}
+
+		/* values always returned in 512 byte blocks */
+		*bytes_value_r = xdqblk.d_bcount * 512ULL;
+		*bytes_limit_r = xdqblk.d_blk_softlimit * 512ULL;
+		if (*bytes_limit_r == 0) {
+			*bytes_limit_r = xdqblk.d_blk_hardlimit * 512ULL;
+		}
+		*count_value_r = xdqblk.d_icount;
+		*count_limit_r = xdqblk.d_ino_softlimit;
+		if (*count_limit_r == 0) {
+			*count_limit_r = xdqblk.d_ino_hardlimit;
+		}
+	} else
+#endif
+	{
+		/* ext2, ext3 */
+		if (quotactl(QCMD(Q_GETQUOTA, type),
+			     root->mount->device_path,
+			     id, (caddr_t)&dqblk) < 0) {
+			if (errno == ESRCH) {
+				fs_quota_root_disable(root, group);
+				return 0;
+			}
+			*error_r = t_strdup_printf(
+				"quotactl(Q_GETQUOTA, %s) failed: %m",
+				root->mount->device_path);
+			if (errno == EINVAL) {
+				*error_r = t_strdup_printf("%s, "
+					"Dovecot was compiled with Linux quota "
+					"v%d support, try changing it "
+					"(CPPFLAGS=-D_LINUX_QUOTA_VERSION=%d configure)",
+					*error_r,
+					_LINUX_QUOTA_VERSION,
+					_LINUX_QUOTA_VERSION == 1 ? 2 : 1);
+			}
+			return -1;
+		}
+
+#if _LINUX_QUOTA_VERSION == 1
+		*bytes_value_r = dqblk.dqb_curblocks * 1024ULL;
+#else
+		*bytes_value_r = dqblk.dqb_curblocks;
+#endif
+		*bytes_limit_r = dqblk.dqb_bsoftlimit * 1024ULL;
+		if (*bytes_limit_r == 0) {
+			*bytes_limit_r = dqblk.dqb_bhardlimit * 1024ULL;
+		}
+		*count_value_r = dqblk.dqb_curinodes;
+		*count_limit_r = dqblk.dqb_isoftlimit;
+		if (*count_limit_r == 0) {
+			*count_limit_r = dqblk.dqb_ihardlimit;
+		}
+	}
+	return 1;
+}
+#endif
+
+#ifdef FS_QUOTA_BSDAIX
+static int
+fs_quota_get_bsdaix(struct fs_quota_root *root, bool group,
+		    uint64_t *bytes_value_r, uint64_t *bytes_limit_r,
+		    uint64_t *count_value_r, uint64_t *count_limit_r,
+		    const char **error_r)
+{
+	struct dqblk dqblk;
+	int type, id;
+
+	type = group ? GRPQUOTA : USRQUOTA;
+	id = group ? root->gid : root->uid;
+
+	if (quotactl(root->mount->mount_path, QCMD(Q_GETQUOTA, type),
+		     id, (void *)&dqblk) < 0) {
+		if (errno == ESRCH) {
+			fs_quota_root_disable(root, group);
+			return 0;
+		}
+		*error_r = t_strdup_printf(
+			"quotactl(Q_GETQUOTA, %s) failed: %m",
+			root->mount->mount_path);
+		return -1;
+	}
+	*bytes_value_r = (uint64_t)dqblk.dqb_curblocks * DEV_BSIZE;
+	*bytes_limit_r = (uint64_t)dqblk.dqb_bsoftlimit * DEV_BSIZE;
+	if (*bytes_limit_r == 0) {
+		*bytes_limit_r = (uint64_t)dqblk.dqb_bhardlimit * DEV_BSIZE;
+	}
+	*count_value_r = dqblk.dqb_curinodes;
+	*count_limit_r = dqblk.dqb_isoftlimit;
+	if (*count_limit_r == 0) {
+		*count_limit_r = dqblk.dqb_ihardlimit;
+	}
+	return 1;
+}
+#endif
+
+#ifdef FS_QUOTA_NETBSD
+static int
+fs_quota_get_netbsd(struct fs_quota_root *root, bool group,
+		    uint64_t *bytes_value_r, uint64_t *bytes_limit_r,
+		    uint64_t *count_value_r, uint64_t *count_limit_r,
+		    const char **error_r)
+{
+	struct quotakey qk;
+	struct quotaval qv;
+	struct quotahandle *qh;
+	int ret;
+
+	if ((qh = quota_open(root->mount->mount_path)) == NULL) {
+		*error_r = t_strdup_printf("cannot open quota for %s: %m",
+					   root->mount->mount_path);
+		fs_quota_root_disable(root, group);
+		return 0;
+	}
+
+	qk.qk_idtype = group ? QUOTA_IDTYPE_GROUP : QUOTA_IDTYPE_USER;
+	qk.qk_id = group ? root->gid : root->uid;
+
+	for (int i = 0; i < 2; i++) {
+		qk.qk_objtype = i == 0 ? QUOTA_OBJTYPE_BLOCKS : QUOTA_OBJTYPE_FILES;
+
+		if (quota_get(qh, &qk, &qv) != 0) {
+			if (errno == ESRCH) {
+				fs_quota_root_disable(root, group);
+				return 0;
+			}
+			*error_r = t_strdup_printf(
+				"quotactl(Q_GETQUOTA, %s) failed: %m",
+				root->mount->mount_path);
+			ret = -1;
+			break;
+		}
+		if (i == 0) {
+			*bytes_value_r = qv.qv_usage * DEV_BSIZE;
+			*bytes_limit_r = qv.qv_softlimit * DEV_BSIZE;
+		} else {
+			*count_value_r = qv.qv_usage;
+			*count_limit_r = qv.qv_softlimit;
+		}
+		ret = 1;
+	}
+	quota_close(qh);
+	return ret;
+}
+#endif
+
+#ifdef FS_QUOTA_HPUX
+static int
+fs_quota_get_hpux(struct fs_quota_root *root,
+		  uint64_t *bytes_value_r, uint64_t *bytes_limit_r,
+		  uint64_t *count_value_r, uint64_t *count_limit_r,
+		  const char **error_r)
+{
+	struct dqblk dqblk;
+
+	if (quotactl(Q_GETQUOTA, root->mount->device_path,
+		     root->uid, &dqblk) < 0) {
+		if (errno == ESRCH) {
+			root->user_disabled = TRUE;
+			return 0;
+		}
+		*error_r = t_strdup_printf(
+			"quotactl(Q_GETQUOTA, %s) failed: %m",
+			root->mount->device_path);
+		return -1;
+	}
+
+	*bytes_value_r = (uint64_t)dqblk.dqb_curblocks *
+		root->mount->block_size;
+	*bytes_limit_r = (uint64_t)dqblk.dqb_bsoftlimit *
+		root->mount->block_size;
+	if (*bytes_limit_r == 0) {
+		*bytes_limit_r = (uint64_t)dqblk.dqb_bhardlimit *
+			root->mount->block_size;
+	}
+	*count_value_r = dqblk.dqb_curfiles;
+	*count_limit_r = dqblk.dqb_fsoftlimit;
+	if (*count_limit_r == 0) {
+		*count_limit_r = dqblk.dqb_fhardlimit;
+	}
+	return 1;
+}
+#endif
+
+#ifdef FS_QUOTA_SOLARIS
+static int
+fs_quota_get_solaris(struct fs_quota_root *root,
+		     uint64_t *bytes_value_r, uint64_t *bytes_limit_r,
+		     uint64_t *count_value_r, uint64_t *count_limit_r,
+		     const char **error_r)
+{
+	struct dqblk dqblk;
+	struct quotctl ctl;
+
+	if (root->mount->fd == -1)
+		return 0;
+
+	ctl.op = Q_GETQUOTA;
+	ctl.uid = root->uid;
+	ctl.addr = (caddr_t)&dqblk;
+	if (ioctl(root->mount->fd, Q_QUOTACTL, &ctl) < 0) {
+		*error_r = t_strdup_printf(
+			"ioctl(%s, Q_QUOTACTL) failed: %m",
+			root->mount->path);
+		return -1;
+	}
+	*bytes_value_r = (uint64_t)dqblk.dqb_curblocks * DEV_BSIZE;
+	*bytes_limit_r = (uint64_t)dqblk.dqb_bsoftlimit * DEV_BSIZE;
+	if (*bytes_limit_r == 0) {
+		*bytes_limit_r = (uint64_t)dqblk.dqb_bhardlimit * DEV_BSIZE;
+	}
+	*count_value_r = dqblk.dqb_curfiles;
+	*count_limit_r = dqblk.dqb_fsoftlimit;
+	if (*count_limit_r == 0) {
+		*count_limit_r = dqblk.dqb_fhardlimit;
+	}
+	return 1;
+}
+#endif
+
+static int
+fs_quota_get_resources(struct fs_quota_root *root, bool group,
+		       uint64_t *bytes_value_r, uint64_t *bytes_limit_r,
+		       uint64_t *count_value_r, uint64_t *count_limit_r,
+		       const char **error_r)
+{
+	if (group) {
+		if (root->group_disabled)
+			return 0;
+	} else {
+		if (root->user_disabled)
+			return 0;
+	}
+#ifdef FS_QUOTA_LINUX
+	return fs_quota_get_linux(root, group, bytes_value_r, bytes_limit_r,
+				  count_value_r, count_limit_r, error_r);
+#elif defined (FS_QUOTA_NETBSD)
+	return fs_quota_get_netbsd(root, group, bytes_value_r, bytes_limit_r,
+				   count_value_r, count_limit_r, error_r);
+#elif defined (FS_QUOTA_BSDAIX)
+	return fs_quota_get_bsdaix(root, group, bytes_value_r, bytes_limit_r,
+				   count_value_r, count_limit_r, error_r);
+#else
+	if (group) {
+		/* not supported */
+		return 0;
+	}
+#ifdef FS_QUOTA_HPUX
+	return fs_quota_get_hpux(root, bytes_value_r, bytes_limit_r,
+				 count_value_r, count_limit_r, error_r);
+#else
+	return fs_quota_get_solaris(root, bytes_value_r, bytes_limit_r,
+				    count_value_r, count_limit_r, error_r);
+#endif
+#endif
+}
+
+static bool fs_quota_match_box(struct quota_root *_root, struct mailbox *box)
+{
+	struct fs_quota_root *root = (struct fs_quota_root *)_root;
+	struct stat mst, rst;
+	const char *mailbox_path;
+	bool match;
+
+	if (root->storage_mount_path == NULL)
+		return TRUE;
+
+	if (mailbox_get_path_to(box, MAILBOX_LIST_PATH_TYPE_MAILBOX,
+				&mailbox_path) <= 0)
+		return FALSE;
+	if (stat(mailbox_path, &mst) < 0) {
+		if (errno != ENOENT)
+			e_error(_root->backend.event,
+				"stat(%s) failed: %m", mailbox_path);
+		return FALSE;
+	}
+	if (stat(root->storage_mount_path, &rst) < 0) {
+		e_debug(_root->backend.event, "stat(%s) failed: %m",
+			root->storage_mount_path);
+		return FALSE;
+	}
+	match = CMP_DEV_T(mst.st_dev, rst.st_dev);
+	e_debug(_root->backend.event, "box=%s mount=%s match=%s", mailbox_path,
+		root->storage_mount_path, match ? "yes" : "no");
+	return match;
+}
+
+static enum quota_get_result
+fs_quota_get_resource(struct quota_root *_root, const char *name,
+		      uint64_t *value_r, const char **error_r)
+{
+	struct fs_quota_root *root = (struct fs_quota_root *)_root;
+	uint64_t bytes_value, count_value;
+	uint64_t bytes_limit = 0, count_limit = 0;
+	int ret;
+
+	*value_r = 0;
+
+	if (root->mount == NULL) {
+		if (root->storage_mount_path != NULL)
+			*error_r = t_strdup_printf(
+				"Mount point unknown for path %s",
+				root->storage_mount_path);
+		else
+			*error_r = "Mount point unknown";
+		return QUOTA_GET_RESULT_INTERNAL_ERROR;
+	}
+	if (strcasecmp(name, QUOTA_NAME_STORAGE_BYTES) != 0 &&
+	    strcasecmp(name, QUOTA_NAME_MESSAGES) != 0) {
+		*error_r = QUOTA_UNKNOWN_RESOURCE_ERROR_STRING;
+		return QUOTA_GET_RESULT_UNKNOWN_RESOURCE;
+	}
+
+#ifdef HAVE_RQUOTA
+	if (mount_type_is_nfs(root->mount)) {
+		ret = root->user_disabled ? 0 :
+			do_rquota_user(root, &bytes_value, &bytes_limit,
+				       &count_value, &count_limit, error_r);
+		if (ret == 0 && !root->group_disabled)
+			ret = do_rquota_group(root, &bytes_value,
+					      &bytes_limit, &count_value,
+					      &count_limit, error_r);
+	} else
+#endif
+	{
+		ret = fs_quota_get_resources(root, FALSE, &bytes_value,
+					     &bytes_limit, &count_value,
+					     &count_limit, error_r);
+		if (ret == 0) {
+			/* fallback to group quota */
+			ret = fs_quota_get_resources(root, TRUE, &bytes_value,
+						     &bytes_limit, &count_value,
+						     &count_limit, error_r);
+		}
+	}
+	if (ret < 0)
+		return QUOTA_GET_RESULT_INTERNAL_ERROR;
+	else if (ret == 0)
+		return QUOTA_GET_RESULT_LIMITED;
+
+	if (strcasecmp(name, QUOTA_NAME_STORAGE_BYTES) == 0)
+		*value_r = bytes_value;
+	else
+		*value_r = count_value;
+	if (_root->bytes_limit != (int64_t)bytes_limit ||
+	    _root->count_limit != (int64_t)count_limit) {
+		/* update limit */
+		_root->bytes_limit = bytes_limit;
+		_root->count_limit = count_limit;
+
+		/* limits have changed, so we'll need to recalculate
+		   relative quota rules */
+		quota_root_recalculate_relative_rules(_root->set, bytes_limit, count_limit);
+	}
+	return QUOTA_GET_RESULT_LIMITED;
+}
+
+static int
+fs_quota_update(struct quota_root *root ATTR_UNUSED,
+		struct quota_transaction_context *ctx ATTR_UNUSED,
+		const char **error_r ATTR_UNUSED)
+{
+	return 0;
+}
+
+struct quota_backend quota_backend_fs = {
+	.name = "fs",
+
+	.v = {
+		.alloc = fs_quota_alloc,
+		.init = fs_quota_init,
+		.deinit = fs_quota_deinit,
+
+		.namespace_added = fs_quota_namespace_added,
+
+		.get_resources = fs_quota_root_get_resources,
+		.get_resource = fs_quota_get_resource,
+		.update = fs_quota_update,
+
+		.match_box = fs_quota_match_box,
+	}
+};
+
+#endif
diff --git a/src/plugins/quota/quota-fs.h b/src/plugins/quota/quota-fs.h
new file mode 100644
index 0000000..8508cdf
--- /dev/null
+++ b/src/plugins/quota/quota-fs.h
@@ -0,0 +1,51 @@
+#ifndef QUOTA_FS_H
+#define QUOTA_FS_H
+
+#if defined (HAVE_STRUCT_DQBLK_CURBLOCKS) || \
+	defined (HAVE_STRUCT_DQBLK_CURSPACE)
+#  define HAVE_FS_QUOTA
+#endif
+
+#ifdef HAVE_QUOTA_OPEN
+/* absolute path to avoid confusion with ./quota.h */
+#  include "/usr/include/quota.h" /* NetBSD with libquota */
+#endif
+
+#ifdef HAVE_SYS_QUOTA_H
+#  include <sys/quota.h> /* Linux, HP-UX */
+#elif defined(HAVE_SYS_FS_UFS_QUOTA_H)
+#  include <sys/fs/ufs_quota.h> /* Solaris */
+#elif defined(HAVE_UFS_UFS_QUOTA_H)
+#  include <ufs/ufs/quota.h> /* BSDs */
+#elif defined(HAVE_JFS_QUOTA_H)
+#  include <jfs/quota.h> /* AIX */
+#  ifdef HAVE_SYS_FS_QUOTA_COMMON_H
+#    include <sys/fs/quota_common.h> /* quotactl() */
+#  endif
+#else
+#  undef HAVE_FS_QUOTA
+#endif
+
+#ifdef HAVE_QUOTACTL
+#  ifdef HAVE_SYS_QUOTA_H
+#    ifndef _HPUX_SOURCE
+#      define FS_QUOTA_LINUX
+#    else
+#      define FS_QUOTA_HPUX
+#    endif
+#  else
+#    define FS_QUOTA_BSDAIX
+#  endif
+#elif defined (HAVE_Q_QUOTACTL)
+#  define FS_QUOTA_SOLARIS
+#else
+#  undef HAVE_FS_QUOTA
+#endif
+
+#ifdef HAVE_QUOTA_OPEN /* NetBSD with libquota */
+#  define FS_QUOTA_NETBSD
+#  define HAVE_FS_QUOTA
+#  undef FS_QUOTA_LINUX /* obtained because we also have <sys/quota.h> */
+#endif
+
+#endif
diff --git a/src/plugins/quota/quota-imapc.c b/src/plugins/quota/quota-imapc.c
new file mode 100644
index 0000000..d5931db
--- /dev/null
+++ b/src/plugins/quota/quota-imapc.c
@@ -0,0 +1,494 @@
+/* Copyright (c) 2017-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ioloop.h"
+#include "imap-arg.h"
+#include "imapc-storage.h"
+#include "mailbox-list-private.h"
+#include "quota-private.h"
+
+struct imapc_quota_refresh_root {
+	const char *name;
+	unsigned int order;
+
+	uint64_t bytes_cur, count_cur;
+	uint64_t bytes_limit, count_limit;
+};
+
+struct imapc_quota_refresh {
+	pool_t pool;
+	const char *box_name;
+	ARRAY(struct imapc_quota_refresh_root) roots;
+};
+
+struct imapc_quota_root {
+	struct quota_root root;
+	const char *box_name, *root_name;
+
+	struct mail_namespace *imapc_ns;
+	struct imapc_storage_client *client;
+	bool initialized;
+
+	uint64_t bytes_last, count_last;
+
+	struct timeval last_refresh;
+	struct imapc_quota_refresh refresh;
+};
+
+extern struct quota_backend quota_backend_imapc;
+
+static struct quota_root *imapc_quota_alloc(void)
+{
+	struct imapc_quota_root *root;
+
+	root = i_new(struct imapc_quota_root, 1);
+	return &root->root;
+}
+
+static void handle_box_param(struct quota_root *_root, const char *param_value)
+{
+	((struct imapc_quota_root *)_root)->box_name = p_strdup(_root->pool, param_value);
+}
+
+static void handle_root_param(struct quota_root *_root, const char *param_value)
+{
+	((struct imapc_quota_root *)_root)->root_name = p_strdup(_root->pool, param_value);
+}
+
+static int imapc_quota_init(struct quota_root *_root, const char *args,
+			    const char **error_r)
+{
+	struct imapc_quota_root *root = (struct imapc_quota_root *)_root;
+	const struct quota_param_parser imapc_params[] = {
+		{.param_name = "box=", .param_handler = handle_box_param},
+		{.param_name = "root=", .param_handler = handle_root_param},
+		quota_param_ns,
+		{.param_name = NULL}
+	};
+
+	_root->auto_updating = TRUE;
+	event_set_append_log_prefix(root->root.backend.event, "quota-imapc: ");
+
+	if (quota_parse_parameters(_root, &args, error_r, imapc_params, TRUE) < 0)
+		return -1;
+
+	if (root->box_name == NULL && root->root_name == NULL)
+		root->box_name = "INBOX";
+	/* we'll never try to enforce the quota - it's just a lot of
+	   unnecessary remote GETQUOTA calls. */
+	_root->no_enforcing = TRUE;
+	return 0;
+}
+
+static void imapc_quota_deinit(struct quota_root *_root)
+{
+	i_free(_root);
+}
+
+static void
+imapc_quota_root_namespace_added(struct quota_root *_root,
+				 struct mail_namespace *ns)
+{
+	struct imapc_quota_root *root = (struct imapc_quota_root *)_root;
+
+	if (root->imapc_ns == NULL)
+		root->imapc_ns = ns;
+}
+
+static struct imapc_quota_refresh *
+imapc_quota_root_refresh_find(struct imapc_storage_client *client)
+{
+	struct imapc_storage *storage = client->_storage;
+	struct quota *quota;
+	struct quota_root *const *rootp;
+
+	i_assert(storage != NULL);
+	quota = quota_get_mail_user_quota(storage->storage.user);
+	i_assert(quota != NULL);
+
+	/* find the quota root that is being refreshed */
+	array_foreach(&quota->roots, rootp) {
+		if ((*rootp)->backend.name == quota_backend_imapc.name) {
+			struct imapc_quota_root *root =
+				(struct imapc_quota_root *)*rootp;
+
+			if (root->refresh.pool != NULL)
+				return &root->refresh;
+		}
+	}
+	return NULL;
+}
+
+static struct imapc_quota_refresh_root *
+imapc_quota_refresh_root_get(struct imapc_quota_refresh *refresh,
+			     const char *root_name)
+{
+	struct imapc_quota_refresh_root *refresh_root;
+
+	array_foreach_modifiable(&refresh->roots, refresh_root) {
+		if (strcmp(refresh_root->name, root_name) == 0)
+			return refresh_root;
+	}
+
+	refresh_root = array_append_space(&refresh->roots);
+	refresh_root->order = UINT_MAX;
+	refresh_root->name = p_strdup(refresh->pool, root_name);
+	refresh_root->bytes_limit = (uint64_t)-1;
+	refresh_root->count_limit = (uint64_t)-1;
+	return refresh_root;
+}
+
+static void imapc_untagged_quotaroot(const struct imapc_untagged_reply *reply,
+				     struct imapc_storage_client *client)
+{
+	struct imapc_quota_refresh *refresh;
+	struct imapc_quota_refresh_root *refresh_root;
+	const char *mailbox_name, *root_name;
+	unsigned int i;
+
+	if (!imap_arg_get_astring(&reply->args[0], &mailbox_name))
+		return;
+
+	if ((refresh = imapc_quota_root_refresh_find(client)) == NULL ||
+	    refresh->box_name == NULL ||
+	    strcmp(refresh->box_name, mailbox_name) != 0) {
+		/* unsolicited QUOTAROOT reply - ignore */
+		return;
+	}
+	if (array_count(&refresh->roots) > 0) {
+		/* duplicate QUOTAROOT reply - ignore */
+		return;
+	}
+
+	i = 1;
+	while (imap_arg_get_astring(&reply->args[i], &root_name)) {
+		refresh_root = imapc_quota_refresh_root_get(refresh, root_name);
+		refresh_root->order = i;
+		i++;
+	}
+}
+
+static void imapc_untagged_quota(const struct imapc_untagged_reply *reply,
+				 struct imapc_storage_client *client)
+{
+	const struct imap_arg *list;
+	struct imapc_quota_refresh *refresh;
+	struct imapc_quota_refresh_root *refresh_root;
+	const char *root_name, *resource, *value_str, *limit_str;
+	uint64_t value, limit;
+	unsigned int i;
+
+	if (!imap_arg_get_astring(&reply->args[0], &root_name) ||
+	    !imap_arg_get_list(&reply->args[1], &list))
+		return;
+
+	if ((refresh = imapc_quota_root_refresh_find(client)) == NULL) {
+		/* unsolicited QUOTA reply - ignore */
+		return;
+	}
+	refresh_root = imapc_quota_refresh_root_get(refresh, root_name);
+
+	for (i = 0; list[i].type != IMAP_ARG_EOL; i += 3) {
+		if (!imap_arg_get_atom(&list[i], &resource) ||
+		    !imap_arg_get_atom(&list[i+1], &value_str) ||
+		    !imap_arg_get_atom(&list[i+2], &limit_str) ||
+		    /* RFC2087 uses 32bit number, but be ready for future */
+		    str_to_uint64(value_str, &value) < 0 ||
+		    str_to_uint64(limit_str, &limit) < 0)
+			return;
+
+		if (strcasecmp(resource, QUOTA_NAME_STORAGE_KILOBYTES) == 0) {
+			refresh_root->bytes_cur = value * 1024;
+			refresh_root->bytes_limit = limit * 1024;
+		} else if (strcasecmp(resource, QUOTA_NAME_MESSAGES) == 0) {
+			refresh_root->count_cur = value;
+			refresh_root->count_limit = limit;
+		}
+	}
+}
+
+static bool imapc_quota_client_init(struct imapc_quota_root *root)
+{
+	struct mailbox_list *list;
+	struct mail_storage *storage;
+
+	if (root->initialized)
+		return root->client != NULL;
+	root->initialized = TRUE;
+
+	list = root->imapc_ns->list;
+	if (mailbox_list_get_storage(&list, "", &storage) == 0 &&
+	    strcmp(storage->name, IMAPC_STORAGE_NAME) != 0) {
+		/* non-imapc namespace, skip */
+		if ((storage->class_flags &
+		     MAIL_STORAGE_CLASS_FLAG_NOQUOTA) == 0) {
+			e_warning(root->root.backend.event,
+				  "Namespace '%s' is not imapc, "
+				  "skipping for imapc quota",
+				  root->imapc_ns->prefix);
+		}
+		return FALSE;
+	}
+	root->client = ((struct imapc_storage *)storage)->client;
+
+	imapc_storage_client_register_untagged(root->client, "QUOTAROOT",
+					       imapc_untagged_quotaroot);
+	imapc_storage_client_register_untagged(root->client, "QUOTA",
+					       imapc_untagged_quota);
+	return TRUE;
+}
+
+static void imapc_quota_refresh_init(struct imapc_quota_refresh *refresh)
+{
+	i_assert(refresh->pool == NULL);
+
+	refresh->pool = pool_alloconly_create("imapc quota refresh", 256);
+	p_array_init(&refresh->roots, refresh->pool, 4);
+}
+
+static void
+imapc_quota_refresh_update(struct quota *quota,
+			   struct imapc_quota_refresh *refresh)
+{
+	struct quota_root *const *rootp;
+	const struct imapc_quota_refresh_root *refresh_root;
+
+	if (array_count(&refresh->roots) == 0) {
+		e_error(quota_backend_imapc.event,
+			"imapc didn't return any QUOTA results");
+		return;
+	}
+	/* use the first quota root for everything */
+	refresh_root = array_front(&refresh->roots);
+
+	array_foreach(&quota->roots, rootp) {
+		if ((*rootp)->backend.name == quota_backend_imapc.name) {
+			struct imapc_quota_root *root =
+				(struct imapc_quota_root *)*rootp;
+
+			root->bytes_last = refresh_root->bytes_cur;
+			root->count_last = refresh_root->count_cur;
+
+			/* If limits are higher than what dovecot can handle
+			   consider them unlimited. */
+			if (refresh_root->bytes_limit > INT64_MAX)
+				root->root.bytes_limit = 0;
+			else
+				root->root.bytes_limit = refresh_root->bytes_limit;
+			if (refresh_root->count_limit > INT64_MAX)
+				root->root.count_limit = 0;
+			else
+				root->root.count_limit = refresh_root->count_limit;
+		}
+	}
+}
+
+static void
+imapc_quota_refresh_deinit(struct quota *quota,
+			   struct imapc_quota_refresh *refresh, bool success)
+{
+	if (success)
+		imapc_quota_refresh_update(quota, refresh);
+	pool_unref(&refresh->pool);
+	i_zero(refresh);
+}
+
+static int
+imapc_quota_refresh_root_order_cmp(const struct imapc_quota_refresh_root *root1,
+				   const struct imapc_quota_refresh_root *root2)
+{
+	if (root1->order < root2->order)
+		return -1;
+	else if (root1->order > root2->order)
+		return 1;
+	else
+		return 0;
+}
+
+static int imapc_quota_refresh_mailbox(struct imapc_quota_root *root,
+				       const char **error_r)
+{
+	struct imapc_simple_context sctx;
+	struct imapc_command *cmd;
+
+	i_assert(root->box_name != NULL);
+
+	/* ask quotas for the configured mailbox */
+	imapc_quota_refresh_init(&root->refresh);
+	root->refresh.box_name = root->box_name;
+
+	imapc_simple_context_init(&sctx, root->client);
+	cmd = imapc_client_cmd(root->client->client,
+			       imapc_simple_callback, &sctx);
+	imapc_command_sendf(cmd, "GETQUOTAROOT %s", root->box_name);
+	imapc_simple_run(&sctx, &cmd);
+
+	/* if there are multiple quota roots, use the first one returned by
+	   the QUOTAROOT */
+	array_sort(&root->refresh.roots, imapc_quota_refresh_root_order_cmp);
+	imapc_quota_refresh_deinit(root->root.quota, &root->refresh,
+				   sctx.ret == 0);
+	if (sctx.ret < 0)
+		*error_r = t_strdup_printf(
+			"GETQUOTAROOT %s failed: %s",
+			root->box_name,
+			mail_storage_get_last_internal_error(
+				&root->client->_storage->storage, NULL));
+
+	return sctx.ret;
+}
+
+static int imapc_quota_refresh_root(struct imapc_quota_root *root,
+				    const char **error_r)
+{
+	struct imapc_simple_context sctx;
+	struct imapc_command *cmd;
+
+	i_assert(root->root_name != NULL);
+
+	/* ask quotas for the configured quota root */
+	imapc_quota_refresh_init(&root->refresh);
+
+	imapc_simple_context_init(&sctx, root->client);
+	cmd = imapc_client_cmd(root->client->client,
+			       imapc_simple_callback, &sctx);
+	imapc_command_sendf(cmd, "GETQUOTA %s", root->root_name);
+	imapc_simple_run(&sctx, &cmd);
+
+	/* there shouldn't be more than one QUOTA reply, but ignore anyway
+	   anything we didn't expect. */
+	while (array_count(&root->refresh.roots) > 0) {
+		const struct imapc_quota_refresh_root *refresh_root =
+			array_front(&root->refresh.roots);
+		if (strcmp(refresh_root->name, root->root_name) == 0)
+			break;
+		array_pop_front(&root->refresh.roots);
+	}
+	imapc_quota_refresh_deinit(root->root.quota, &root->refresh,
+				   sctx.ret == 0);
+	if (sctx.ret < 0)
+		*error_r = t_strdup_printf(
+			"GETQUOTA %s failed: %s",
+			root->root_name,
+			mail_storage_get_last_internal_error(
+				&root->client->_storage->storage, NULL));
+	return sctx.ret;
+}
+
+static int imapc_quota_refresh(struct imapc_quota_root *root,
+			       const char **error_r)
+{
+	enum imapc_capability capa;
+	int ret;
+
+	if (root->imapc_ns == NULL) {
+		/* imapc namespace is missing - disable this quota backend */
+		return 0;
+	}
+	if (root->last_refresh.tv_sec == ioloop_timeval.tv_sec &&
+	    root->last_refresh.tv_usec == ioloop_timeval.tv_usec)
+		return 0;
+	if (!imapc_quota_client_init(root))
+		return 0;
+
+	if (imapc_client_get_capabilities(root->client->client, &capa) < 0) {
+		*error_r = "Failed to get server capabilities";
+		return -1;
+	}
+	if ((capa & IMAPC_CAPABILITY_QUOTA) == 0) {
+		/* no QUOTA capability - disable quota */
+		e_warning(root->root.backend.event,
+			  "Remote IMAP server doesn't support QUOTA - disabling");
+		root->client = NULL;
+		return 0;
+	}
+
+	if (root->root_name == NULL)
+		ret = imapc_quota_refresh_mailbox(root, error_r);
+	else
+		ret = imapc_quota_refresh_root(root, error_r);
+
+	/* set the last_refresh only after the refresh, because it changes
+	   ioloop_timeval. */
+	root->last_refresh = ioloop_timeval;
+	return ret;
+}
+
+static int imapc_quota_init_limits(struct quota_root *_root,
+				   const char **error_r)
+{
+	struct imapc_quota_root *root = (struct imapc_quota_root *)_root;
+
+	return imapc_quota_refresh(root, error_r);
+}
+
+static void
+imapc_quota_namespace_added(struct quota *quota, struct mail_namespace *ns)
+{
+	struct quota_root **roots;
+	unsigned int i, count;
+
+	roots = array_get_modifiable(&quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		if (roots[i]->backend.name == quota_backend_imapc.name &&
+		    ((roots[i]->ns_prefix == NULL &&
+		      ns->type == MAIL_NAMESPACE_TYPE_PRIVATE) ||
+		     roots[i]->ns == ns))
+			imapc_quota_root_namespace_added(roots[i], ns);
+	}
+}
+
+static const char *const *
+imapc_quota_root_get_resources(struct quota_root *root ATTR_UNUSED)
+{
+	static const char *resources_both[] = {
+		QUOTA_NAME_STORAGE_KILOBYTES,
+		QUOTA_NAME_MESSAGES,
+		NULL
+	};
+	return resources_both;
+}
+
+static enum quota_get_result
+imapc_quota_get_resource(struct quota_root *_root, const char *name,
+			 uint64_t *value_r, const char **error_r)
+{
+	struct imapc_quota_root *root = (struct imapc_quota_root *)_root;
+
+	if (imapc_quota_refresh(root, error_r) < 0)
+		return QUOTA_GET_RESULT_INTERNAL_ERROR;
+
+	if (strcmp(name, QUOTA_NAME_STORAGE_BYTES) == 0)
+		*value_r = root->bytes_last;
+	else if (strcmp(name, QUOTA_NAME_MESSAGES) == 0)
+		*value_r = root->count_last;
+	else {
+		*error_r = QUOTA_UNKNOWN_RESOURCE_ERROR_STRING;
+		return QUOTA_GET_RESULT_UNKNOWN_RESOURCE;
+	}
+	return QUOTA_GET_RESULT_LIMITED;
+}
+
+static int
+imapc_quota_update(struct quota_root *root ATTR_UNUSED,
+		   struct quota_transaction_context *ctx ATTR_UNUSED,
+		   const char **error_r ATTR_UNUSED)
+{
+	return 0;
+}
+
+struct quota_backend quota_backend_imapc = {
+	.name = "imapc",
+
+	.v = {
+		.alloc = imapc_quota_alloc,
+		.init = imapc_quota_init,
+		.deinit = imapc_quota_deinit,
+		.init_limits = imapc_quota_init_limits,
+		.namespace_added = imapc_quota_namespace_added,
+		.get_resources = imapc_quota_root_get_resources,
+		.get_resource = imapc_quota_get_resource,
+		.update = imapc_quota_update,
+	}
+};
diff --git a/src/plugins/quota/quota-maildir.c b/src/plugins/quota/quota-maildir.c
new file mode 100644
index 0000000..f4fd3a7
--- /dev/null
+++ b/src/plugins/quota/quota-maildir.c
@@ -0,0 +1,953 @@
+/* Copyright (c) 2006-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ioloop.h"
+#include "nfs-workarounds.h"
+#include "safe-mkstemp.h"
+#include "mkdir-parents.h"
+#include "read-full.h"
+#include "write-full.h"
+#include "str.h"
+#include "maildir-storage.h"
+#include "mailbox-list-private.h"
+#include "quota-private.h"
+
+#include <stdio.h>
+#include <dirent.h>
+#include <sys/stat.h>
+
+#define MAILDIRSIZE_FILENAME "maildirsize"
+#define MAILDIRSIZE_STALE_SECS (60*15)
+
+struct maildir_quota_root {
+	struct quota_root root;
+
+	struct mail_namespace *maildirsize_ns;
+	const char *maildirsize_path;
+
+	uint64_t total_bytes;
+	uint64_t total_count;
+
+	int fd;
+	time_t recalc_last_stamp;
+	off_t last_size;
+
+	bool limits_initialized:1;
+};
+
+struct maildir_list_context {
+	struct mailbox_list *list;
+	struct maildir_quota_root *root;
+	struct mailbox_list_iterate_context *iter;
+	const struct mailbox_info *info;
+
+	string_t *path;
+	int state;
+};
+
+extern struct quota_backend quota_backend_maildir;
+
+static struct dotlock_settings dotlock_settings = {
+	.timeout = 0,
+	.stale_timeout = 30
+};
+
+static int maildir_sum_dir(const char *dir, uint64_t *total_bytes,
+			   uint64_t *total_count, const char **error_r)
+{
+	DIR *dirp;
+	struct dirent *dp;
+	string_t *path;
+	const char *p;
+	size_t len;
+	uoff_t num;
+	int ret = 0;
+
+	dirp = opendir(dir);
+	if (dirp == NULL) {
+		if (errno == ENOENT || errno == ESTALE)
+			return 0;
+		*error_r = t_strdup_printf("opendir(%s) failed: %m", dir);
+		return -1;
+	}
+
+	path = t_str_new(256);
+	str_append(path, dir);
+	str_append_c(path, '/');
+
+	len = str_len(path);
+	while ((dp = readdir(dirp)) != NULL) {
+		if (dp->d_name[0] == '.' &&
+		    (dp->d_name[1] == '\0' || dp->d_name[1] == '.'))
+			continue;
+
+		p = strstr(dp->d_name, ",S=");
+		num = UOFF_T_MAX;
+		if (p != NULL) {
+			/* ,S=nnnn[:,] */
+			p += 3;
+			for (num = 0; *p >= '0' && *p <= '9'; p++)
+				num = num * 10 + (*p - '0');
+
+			if (*p != ':' && *p != '\0' && *p != ',') {
+				/* not in expected format, fallback to stat() */
+				num = UOFF_T_MAX;
+			} else {
+				*total_bytes += num;
+				*total_count += 1;
+			}
+		}
+		if (num == UOFF_T_MAX) {
+			struct stat st;
+
+			str_truncate(path, len);
+			str_append(path, dp->d_name);
+			if (stat(str_c(path), &st) == 0) {
+				*total_bytes += st.st_size;
+				*total_count += 1;
+			} else if (errno != ENOENT && errno != ESTALE) {
+				*error_r = t_strdup_printf(
+					"stat(%s) failed: %m", str_c(path));
+				ret = -1;
+			}
+		}
+	}
+
+	if (closedir(dirp) < 0) {
+		*error_r = t_strdup_printf("closedir(%s) failed: %m", dir);
+		return -1;
+	}
+	return ret;
+}
+
+static struct maildir_list_context *
+maildir_list_init(struct maildir_quota_root *root, struct mailbox_list *list)
+{
+	struct maildir_list_context *ctx;
+
+	ctx = i_new(struct maildir_list_context, 1);
+	ctx->root = root;
+	ctx->path = str_new(default_pool, 512);
+	ctx->list = list;
+	ctx->iter = mailbox_list_iter_init(list, "*",
+					   MAILBOX_LIST_ITER_SKIP_ALIASES |
+					   MAILBOX_LIST_ITER_RETURN_NO_FLAGS);
+	return ctx;
+}
+
+static bool maildir_set_next_path(struct maildir_list_context *ctx)
+{
+	const char *path, *storage_name;
+
+	str_truncate(ctx->path, 0);
+
+	storage_name = mailbox_list_get_storage_name(
+				ctx->info->ns->list, ctx->info->vname);
+	if (mailbox_list_get_path(ctx->list, storage_name,
+					MAILBOX_LIST_PATH_TYPE_MAILBOX,
+					&path) > 0) {
+		str_append(ctx->path, path);
+		str_append(ctx->path, ctx->state == 0 ?
+				"/new" : "/cur");
+	}
+
+	return str_len(ctx->path) > 0;
+}
+
+static const char *
+maildir_list_next(struct maildir_list_context *ctx, time_t *mtime_r)
+{
+	struct quota_rule *rule;
+	struct stat st;
+
+	for (;;) {
+		if (ctx->state == 0) {
+			ctx->info = mailbox_list_iter_next(ctx->iter);
+			if (ctx->info == NULL)
+				return NULL;
+
+			rule = quota_root_rule_find(ctx->root->root.set,
+						    ctx->info->vname);
+			if (rule != NULL && rule->ignore) {
+				/* mailbox not included in quota */
+				continue;
+			}
+		}
+
+		if (!maildir_set_next_path(ctx)) {
+			ctx->state = 0;
+			continue;
+		}
+
+		if (++ctx->state == 2)
+			ctx->state = 0;
+
+		if (stat(str_c(ctx->path), &st) == 0)
+			break;
+		/* ignore if the directory got lost, stale or if it was
+		   actually a file and not a directory */
+		if (errno != ENOENT && errno != ESTALE && errno != ENOTDIR) {
+			e_error(ctx->root->root.backend.event,
+				"stat(%s) failed: %m", str_c(ctx->path));
+			ctx->state = 0;
+		}
+	}
+
+	*mtime_r = st.st_mtime;
+	return str_c(ctx->path);
+}
+
+static int maildir_list_deinit(struct maildir_list_context *ctx,
+			       const char **error_r)
+{
+	int ret = mailbox_list_iter_deinit(&ctx->iter);
+	if (ret < 0)
+		*error_r = t_strdup_printf(
+			"Listing mailboxes failed: %s",
+			mailbox_list_get_last_internal_error(ctx->list, NULL));
+
+	str_free(&ctx->path);
+	i_free(ctx);
+	return ret;
+}
+
+static int
+maildirs_check_have_changed(struct maildir_quota_root *root,
+			    struct mail_namespace *ns, time_t latest_mtime,
+			    const char **error_r)
+{
+	struct maildir_list_context *ctx;
+	time_t mtime;
+	int ret = 0;
+
+	ctx = maildir_list_init(root, ns->list);
+	while (maildir_list_next(ctx, &mtime) != NULL) {
+		if (mtime > latest_mtime) {
+			ret = 1;
+			break;
+		}
+	}
+	if (maildir_list_deinit(ctx, error_r) < 0)
+		return -1;
+	return ret;
+}
+
+static int maildirsize_write(struct maildir_quota_root *root, const char *path)
+{
+	const struct mail_storage_settings *set =
+		root->maildirsize_ns->mail_set;
+	struct quota_root *_root = &root->root;
+	struct mail_namespace *const *namespaces;
+	unsigned int i, count;
+	struct mailbox_permissions perm;
+	const char *p, *dir;
+	string_t *str, *temp_path;
+	int fd;
+
+	i_assert(root->fd == -1);
+
+	/* figure out what permissions we should use for maildirsize.
+	   use the inbox namespace's permissions if possible. */
+	perm.file_create_mode = 0600; perm.dir_create_mode = 0700;
+	perm.file_create_gid = (gid_t)-1;
+	perm.file_create_gid_origin = "default";
+	namespaces = array_get(&root->root.quota->namespaces, &count);
+	i_assert(count > 0);
+	for (i = 0; i < count; i++) {
+		if ((namespaces[i]->flags & NAMESPACE_FLAG_INBOX_USER) == 0)
+			continue;
+
+		mailbox_list_get_root_permissions(namespaces[i]->list,
+						  &perm);
+		break;
+	}
+
+	dotlock_settings.use_excl_lock = set->dotlock_use_excl;
+	dotlock_settings.nfs_flush = set->mail_nfs_storage;
+
+	temp_path = t_str_new(128);
+	str_append(temp_path, path);
+	fd = safe_mkstemp_hostpid_group(temp_path, perm.file_create_mode,
+					perm.file_create_gid,
+					perm.file_create_gid_origin);
+	if (fd == -1 && errno == ENOENT) {
+		/* the control directory doesn't exist yet? create it */
+		p = strrchr(path, '/');
+		dir = t_strdup_until(path, p);
+		if (mkdir_parents_chgrp(dir, perm.dir_create_mode,
+					perm.file_create_gid,
+					perm.file_create_gid_origin) < 0 &&
+		    errno != EEXIST) {
+			e_error(root->root.backend.event,
+				"mkdir_parents(%s) failed: %m", dir);
+			return -1;
+		}
+		fd = safe_mkstemp_hostpid_group(temp_path,
+						perm.file_create_mode,
+						perm.file_create_gid,
+						perm.file_create_gid_origin);
+	}
+	if (fd == -1) {
+		e_error(root->root.backend.event,
+			"safe_mkstemp(%s) failed: %m", path);
+		return -1;
+	}
+
+	str = t_str_new(128);
+	/* if we have no limits, write 0S instead of an empty line */
+	if (_root->bytes_limit != 0 || _root->count_limit == 0) {
+		str_printfa(str, "%"PRId64"S", _root->bytes_limit);
+	}
+	if (_root->count_limit != 0) {
+		if (str_len(str) > 0)
+			str_append_c(str, ',');
+		str_printfa(str, "%"PRIu64"C", _root->count_limit);
+	}
+	str_printfa(str, "\n%"PRIu64" %"PRIu64"\n",
+		    root->total_bytes, root->total_count);
+	if (write_full(fd, str_data(str), str_len(str)) < 0) {
+		e_error(root->root.backend.event,
+			"write_full(%s) failed: %m", str_c(temp_path));
+		i_close_fd(&fd);
+		i_unlink(str_c(temp_path));
+		return -1;
+	}
+	i_close_fd(&fd);
+
+	if (rename(str_c(temp_path), path) < 0) {
+		e_error(root->root.backend.event,
+			"rename(%s, %s) failed: %m", str_c(temp_path), path);
+		i_unlink_if_exists(str_c(temp_path));
+		return -1;
+	}
+	return 0;
+}
+
+static void maildirsize_recalculate_init(struct maildir_quota_root *root)
+{
+	root->total_bytes = root->total_count = 0;
+	root->recalc_last_stamp = 0;
+}
+
+static int maildirsize_recalculate_namespace(struct maildir_quota_root *root,
+					     struct mail_namespace *ns,
+					     const char **error_r)
+{
+	struct maildir_list_context *ctx;
+	const char *dir;
+	time_t mtime;
+	int ret = 0;
+
+	ctx = maildir_list_init(root, ns->list);
+	while ((dir = maildir_list_next(ctx, &mtime)) != NULL) {
+		if (mtime > root->recalc_last_stamp)
+			root->recalc_last_stamp = mtime;
+
+		if (maildir_sum_dir(dir, &root->total_bytes,
+				    &root->total_count, error_r) < 0)
+			ret = -1;
+	}
+	if (maildir_list_deinit(ctx, error_r) < 0)
+		ret = -1;
+
+	return ret;
+}
+
+static void maildirsize_rebuild_later(struct maildir_quota_root *root)
+{
+	if (!root->root.set->force_default_rule) {
+		/* FIXME: can't unlink(), because the limits would be lost. */
+		return;
+	}
+
+	if (unlink(root->maildirsize_path) < 0 &&
+	    errno != ENOENT && errno != ESTALE)
+		e_error(root->root.backend.event,
+			"unlink(%s) failed: %m", root->maildirsize_path);
+}
+
+static int maildirsize_recalculate_finish(struct maildir_quota_root *root,
+					  int ret, const char **error_r)
+{
+	if (ret == 0) {
+		/* maildir didn't change, we can write the maildirsize file */
+		if ((ret = maildirsize_write(root, root->maildirsize_path)) < 0)
+			*error_r = "failed to write maildirsize";
+	}
+	if (ret != 0)
+		maildirsize_rebuild_later(root);
+
+	return ret;
+}
+
+static int maildirsize_recalculate(struct maildir_quota_root *root,
+				   const char **error_r)
+{
+	struct mail_namespace *const *namespaces;
+	struct event_reason *reason;
+	unsigned int i, count;
+	int ret = 0;
+
+	reason = event_reason_begin("quota:recalculate");
+	maildirsize_recalculate_init(root);
+
+	/* count mails from all namespaces */
+	namespaces = array_get(&root->root.quota->namespaces, &count);
+	for (i = 0; i < count; i++) {
+		if (!quota_root_is_namespace_visible(&root->root, namespaces[i]))
+			continue;
+
+		if (maildirsize_recalculate_namespace(root, namespaces[i], error_r) < 0) {
+			ret = -1;
+			break;
+		}
+	}
+
+	if (ret == 0) {
+		/* check if any of the directories have changed */
+		for (i = 0; i < count; i++) {
+			if (!quota_root_is_namespace_visible(&root->root,
+							   namespaces[i]))
+				continue;
+
+			ret = maildirs_check_have_changed(root, namespaces[i],
+						root->recalc_last_stamp,
+						error_r);
+			if (ret != 0)
+				break;
+		}
+	}
+
+	ret = maildirsize_recalculate_finish(root, ret, error_r);
+	event_reason_end(&reason);
+	return ret;
+}
+
+static bool
+maildir_parse_limit(const char *str, uint64_t *bytes_r, uint64_t *count_r)
+{
+	const char *const *limit;
+	unsigned long long value;
+	const char *pos;
+	bool ret = TRUE;
+
+	*bytes_r = 0;
+	*count_r = 0;
+
+	/* 0 values mean unlimited */
+	for (limit = t_strsplit(str, ","); *limit != NULL; limit++) {
+		if (str_parse_ullong(*limit, &value, &pos) < 0) {
+			ret = FALSE;
+			continue;
+		}
+		if (pos[0] != '\0' && pos[1] == '\0') {
+			switch (pos[0]) {
+			case 'C':
+				if (value != 0)
+					*count_r = value;
+				break;
+			case 'S':
+				if (value != 0)
+					*bytes_r = value;
+				break;
+			default:
+				ret = FALSE;
+				break;
+			}
+		} else {
+			ret = FALSE;
+		}
+	}
+	return ret;
+}
+
+static int maildirsize_parse(struct maildir_quota_root *root,
+			     int fd, const char *const *lines)
+{
+	struct quota_root *_root = &root->root;
+	uint64_t message_bytes_limit, message_count_limit;
+	long long bytes_diff, total_bytes;
+	int count_diff, total_count;
+	unsigned int line_count = 0;
+
+	if (*lines == NULL)
+		return -1;
+
+	/* first line contains the limits */
+	(void)maildir_parse_limit(lines[0], &message_bytes_limit,
+				  &message_count_limit);
+
+	/* truncate too high limits to signed 64bit int range */
+	if (message_bytes_limit >= (1ULL << 63))
+		message_bytes_limit = (1ULL << 63) - 1;
+	if (message_count_limit >= (1ULL << 63))
+		message_count_limit = (1ULL << 63) - 1;
+
+	if (root->root.bytes_limit == (int64_t)message_bytes_limit &&
+	    root->root.count_limit == (int64_t)message_count_limit) {
+		/* limits haven't changed */
+	} else if (root->root.set->force_default_rule) {
+		/* we know the limits and they've changed.
+		   the file must be rewritten. */
+		return 0;
+	} else {
+		/* we're using limits from the file. */
+		root->root.bytes_limit = message_bytes_limit;
+		root->root.count_limit = message_count_limit;
+		quota_root_recalculate_relative_rules(root->root.set,
+						      message_bytes_limit,
+						      message_count_limit);
+	}
+
+	if (*lines == NULL) {
+		/* no quota lines. rebuild it. */
+		return 0;
+	}
+
+	/* rest of the lines contains <bytes> <count> diffs */
+	total_bytes = 0; total_count = 0;
+	for (lines++; *lines != NULL; lines++, line_count++) {
+		if (sscanf(*lines, "%lld %d", &bytes_diff, &count_diff) != 2)
+			return -1;
+
+		total_bytes += bytes_diff;
+		total_count += count_diff;
+	}
+
+	if (total_bytes < 0 || total_count < 0) {
+		/* corrupted */
+		return -1;
+	}
+
+	if ((total_bytes > _root->bytes_limit && _root->bytes_limit != 0) ||
+	    (total_count > _root->count_limit && _root->count_limit != 0)) {
+		/* we're over quota. don't trust these values if the file
+		   contains more than the initial summary line, or if the file
+		   is older than 15 minutes. */
+		struct stat st;
+
+		if (line_count > 1)
+			return 0;
+
+		if (fstat(fd, &st) < 0 ||
+		    st.st_mtime < ioloop_time - MAILDIRSIZE_STALE_SECS)
+			return 0;
+	}
+	root->total_bytes = (uint64_t)total_bytes;
+	root->total_count = (uint64_t)total_count;
+	return 1;
+}
+
+static int maildirsize_open(struct maildir_quota_root *root,
+			    const char **error_r)
+{
+	i_close_fd_path(&root->fd, root->maildirsize_path);
+
+	root->fd = nfs_safe_open(root->maildirsize_path, O_RDWR | O_APPEND);
+	if (root->fd == -1) {
+		if (errno == ENOENT)
+			return 0;
+		*error_r = t_strdup_printf(
+			"open(%s) failed: %m", root->maildirsize_path);
+		return -1;
+	}
+	return 1;
+}
+
+static bool maildirsize_has_changed(struct maildir_quota_root *root)
+{
+	struct stat st1, st2;
+
+	if (dotlock_settings.nfs_flush) {
+		nfs_flush_file_handle_cache(root->maildirsize_path);
+		nfs_flush_attr_cache_unlocked(root->maildirsize_path);
+	}
+
+	if (root->fd == -1)
+		return TRUE;
+
+	if (stat(root->maildirsize_path, &st1) < 0)
+		return TRUE;
+	if (fstat(root->fd, &st2) < 0)
+		return TRUE;
+
+	return root->last_size != st2.st_size || st1.st_ino != st2.st_ino ||
+		!CMP_DEV_T(st1.st_dev, st2.st_dev);
+}
+
+static int maildirsize_read(struct maildir_quota_root *root, bool *retry,
+			    const char **error_r)
+{
+	char buf[5120+1];
+	unsigned int i, size;
+	bool retry_estale = *retry;
+	int ret;
+
+	*retry = FALSE;
+
+	if (!maildirsize_has_changed(root))
+		return 1;
+
+	if ((ret = maildirsize_open(root, error_r)) <= 0)
+		return ret;
+
+	/* @UNSAFE */
+	size = 0;
+	while ((ret = read(root->fd, buf + size, sizeof(buf)-1 - size)) != 0) {
+		if (ret < 0) {
+			if (errno == ESTALE && retry_estale) {
+				*retry = TRUE;
+				break;
+			}
+			*error_r = t_strdup_printf(
+				"read(%s) failed: %m", root->maildirsize_path);
+			break;
+		}
+		size += ret;
+		if (size >= sizeof(buf)-1) {
+			/* we'll need to recalculate the quota */
+			break;
+		}
+	}
+
+	/* try to use the file even if we ran into some error. if we don't have
+	   forced limits, we'll need to read the header to get them */
+	root->total_bytes = root->total_count = 0;
+	root->last_size = size;
+
+	/* skip the last line if there's no LF at the end. Remove the last LF
+	   so we don't get one empty line in the strsplit. */
+	while (size > 0 && buf[size-1] != '\n') size--;
+	if (size > 0) size--;
+	buf[size] = '\0';
+
+	if (ret < 0 && size == 0) {
+		/* the read failed and there's no usable header, fail. */
+		i_close_fd(&root->fd);
+		return -1;
+	}
+
+	/* If there are any NUL bytes, the file is broken. */
+	for (i = 0; i < size; i++) {
+		if (buf[i] == '\0')
+			break;
+	}
+
+	if (i == size &&
+	    maildirsize_parse(root, root->fd, t_strsplit(buf, "\n")) > 0 &&
+	    ret == 0)
+		ret = 1;
+	else {
+		/* broken file / need recalculation */
+		i_close_fd(&root->fd);
+		ret = 0;
+	}
+	return ret;
+}
+
+static bool maildirquota_limits_init(struct maildir_quota_root *root)
+{
+	struct mailbox_list *list;
+	struct mail_storage *storage;
+	const char *control_dir;
+
+	if (root->limits_initialized)
+		return root->maildirsize_path != NULL;
+	root->limits_initialized = TRUE;
+
+	if (root->maildirsize_ns == NULL) {
+		i_assert(root->maildirsize_path == NULL);
+		return FALSE;
+	}
+
+	list = root->maildirsize_ns->list;
+	if (mailbox_list_get_storage(&list, "", &storage) == 0 &&
+	    strcmp(storage->name, MAILDIR_STORAGE_NAME) != 0) {
+		/* non-maildir namespace, skip */
+		if ((storage->class_flags &
+		     MAIL_STORAGE_CLASS_FLAG_NOQUOTA) == 0) {
+			e_warning(root->root.backend.event,
+				  "Namespace '%s' is not Maildir, "
+				  "skipping for Maildir++ quota",
+				  root->maildirsize_ns->prefix);
+		}
+		root->maildirsize_path = NULL;
+		return FALSE;
+	}
+	if (root->maildirsize_path == NULL) {
+		if (!mailbox_list_get_root_path(list, MAILBOX_LIST_PATH_TYPE_CONTROL,
+						&control_dir))
+			i_unreached();
+		root->maildirsize_path =
+			p_strconcat(root->root.pool, control_dir,
+				    "/"MAILDIRSIZE_FILENAME, NULL);
+	}
+	return TRUE;
+}
+
+static int maildirquota_read_limits(struct maildir_quota_root *root,
+				    const char **error_r)
+{
+	bool retry = TRUE;
+	int ret, n = 0;
+
+	if (!maildirquota_limits_init(root))
+		return 1;
+
+	do {
+		if (n == NFS_ESTALE_RETRY_COUNT)
+			retry = FALSE;
+		ret = maildirsize_read(root, &retry, error_r);
+		n++;
+	} while (ret == -1 && retry);
+	return ret;
+}
+
+static int
+maildirquota_refresh(struct maildir_quota_root *root, bool *recalculated_r,
+		     const char **error_r)
+{
+	int ret;
+
+	*recalculated_r = FALSE;
+
+	ret = maildirquota_read_limits(root, error_r);
+	if (ret == 0) {
+		if (root->root.bytes_limit == 0 &&
+		    root->root.count_limit == 0 &&
+		    root->root.set->default_rule.bytes_limit == 0 &&
+		    root->root.set->default_rule.count_limit == 0) {
+			/* no quota */
+			if (!root->root.set->force_default_rule)
+				return 0;
+			/* explicitly specified 0 as quota. keep the quota
+			   updated even if it's not enforced. */
+		}
+
+		ret = maildirsize_recalculate(root, error_r);
+		if (ret == 0)
+			*recalculated_r = TRUE;
+	}
+	return ret < 0 ? -1 : 0;
+}
+
+static int maildirsize_update(struct maildir_quota_root *root,
+			      int count_diff, int64_t bytes_diff)
+{
+	char str[MAX_INT_STRLEN * 2 + 2];
+	int ret = 0;
+
+	if (count_diff == 0 && bytes_diff == 0)
+		return 0;
+
+	/* We rely on O_APPEND working in here. That isn't NFS-safe, but it
+	   isn't necessarily that bad because the file is recreated once in
+	   a while, and sooner if corruption causes calculations to go
+	   over quota. This is also how Maildir++ spec specifies it should be
+	   done.. */
+	if (i_snprintf(str, sizeof(str), "%lld %d\n",
+		       (long long)bytes_diff, count_diff) < 0)
+		i_unreached();
+	if (write_full(root->fd, str, strlen(str)) < 0) {
+		ret = -1;
+		if (errno == ESTALE) {
+			/* deleted/replaced already, ignore */
+		} else {
+			e_error(root->root.backend.event,
+				"write_full(%s) failed: %m",
+				root->maildirsize_path);
+		}
+	} else {
+		/* close the file to force a flush with NFS */
+		if (close(root->fd) < 0) {
+			ret = -1;
+			if (errno != ESTALE)
+				e_error(root->root.backend.event,
+					"close(%s) failed: %m", root->maildirsize_path);
+		}
+		root->fd = -1;
+	}
+	return ret;
+}
+
+static struct quota_root *maildir_quota_alloc(void)
+{
+	struct maildir_quota_root *root;
+
+	root = i_new(struct maildir_quota_root, 1);
+	root->fd = -1;
+	return &root->root;
+}
+
+static int maildir_quota_init(struct quota_root *_root, const char *args,
+			      const char **error_r)
+{
+	event_set_append_log_prefix(_root->backend.event, "quota-maildir: ");
+	return quota_root_default_init(_root, args, error_r);
+}
+
+static void maildir_quota_deinit(struct quota_root *_root)
+{
+	struct maildir_quota_root *root = (struct maildir_quota_root *)_root;
+
+	i_close_fd(&root->fd);
+	i_free(root);
+}
+
+static bool
+maildir_quota_parse_rule(struct quota_root_settings *root_set ATTR_UNUSED,
+			 struct quota_rule *rule,
+			 const char *str, const char **error_r)
+{
+	uint64_t bytes, count;
+
+	if (strcmp(str, "NOQUOTA") == 0) {
+		bytes = 0;
+		count = 0;
+	} else if (!maildir_parse_limit(str, &bytes, &count)) {
+		*error_r = t_strdup_printf(
+			"quota-maildir: Invalid Maildir++ quota rule \"%s\"",
+			str);
+		return FALSE;
+	}
+
+	rule->bytes_limit = bytes;
+	rule->count_limit = count;
+	return TRUE;
+}
+
+static int maildir_quota_init_limits(struct quota_root *_root,
+				     const char **error_r)
+{
+	struct maildir_quota_root *root = (struct maildir_quota_root *)_root;
+	const char *error;
+
+	if (maildirquota_read_limits(root, &error) < 0) {
+		*error_r = t_strdup_printf(
+			"quota-maildir: Failed to read limits: %s", error);
+		return -1;
+	}
+	return 0;
+}
+
+static void
+maildir_quota_root_namespace_added(struct quota_root *_root,
+				   struct mail_namespace *ns)
+{
+	struct maildir_quota_root *root = (struct maildir_quota_root *)_root;
+
+	if (root->maildirsize_ns == NULL)
+		root->maildirsize_ns = ns;
+}
+
+static void
+maildir_quota_namespace_added(struct quota *quota, struct mail_namespace *ns)
+{
+	struct quota_root **roots;
+	unsigned int i, count;
+
+	roots = array_get_modifiable(&quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		if (roots[i]->backend.name == quota_backend_maildir.name &&
+		    ((roots[i]->ns_prefix == NULL &&
+		      ns->type == MAIL_NAMESPACE_TYPE_PRIVATE) ||
+		     roots[i]->ns == ns))
+			maildir_quota_root_namespace_added(roots[i], ns);
+	}
+}
+
+static const char *const *
+maildir_quota_root_get_resources(struct quota_root *root ATTR_UNUSED)
+{
+	static const char *resources_both[] = {
+		QUOTA_NAME_STORAGE_KILOBYTES,
+		QUOTA_NAME_MESSAGES,
+		NULL
+	};
+
+	return resources_both;
+}
+
+static enum quota_get_result
+maildir_quota_get_resource(struct quota_root *_root, const char *name,
+			   uint64_t *value_r, const char **error_r)
+{
+	struct maildir_quota_root *root = (struct maildir_quota_root *)_root;
+	bool recalculated;
+	const char *error;
+
+	if (maildirquota_refresh(root, &recalculated, &error) < 0) {
+		*error_r = t_strdup_printf("Failed to get %s: %s", name, error);
+		return QUOTA_GET_RESULT_INTERNAL_ERROR;
+	}
+
+	if (strcmp(name, QUOTA_NAME_STORAGE_BYTES) == 0) {
+		*value_r = root->total_bytes;
+	} else if (strcmp(name, QUOTA_NAME_MESSAGES) == 0) {
+		*value_r = root->total_count;
+	} else {
+		*error_r = QUOTA_UNKNOWN_RESOURCE_ERROR_STRING;
+		return QUOTA_GET_RESULT_UNKNOWN_RESOURCE;
+	}
+	return QUOTA_GET_RESULT_LIMITED;
+}
+
+static int
+maildir_quota_update(struct quota_root *_root,
+		     struct quota_transaction_context *ctx,
+		     const char **error_r)
+{
+	struct maildir_quota_root *root = (struct maildir_quota_root *)_root;
+	bool recalculated;
+	const char *error;
+
+	if (!maildirquota_limits_init(root)) {
+		/* no limits */
+		return 0;
+	}
+
+	/* even though we don't really care about the limits in here ourself,
+	   we do want to make sure the header gets updated if the limits have
+	   changed. also this makes sure the maildirsize file is created if
+	   it doesn't exist. */
+	if (maildirquota_refresh(root, &recalculated, &error) < 0) {
+		*error_r = t_strdup_printf(
+			"Could not update storage usage data: %s",
+			error);
+		return -1;
+	}
+
+	if (recalculated) {
+		/* quota was just recalculated and it already contains the changes
+		   we wanted to do. */
+	} else if (root->fd == -1) {
+		if (maildirsize_recalculate(root, &error) < 0)
+			e_error(root->root.backend.event, "%s", error);
+	} else if (ctx->recalculate != QUOTA_RECALCULATE_DONT) {
+		i_close_fd(&root->fd);
+		if (maildirsize_recalculate(root, &error) < 0)
+			e_error(root->root.backend.event, "%s", error);
+	} else if (maildirsize_update(root, ctx->count_used, ctx->bytes_used) < 0) {
+		i_close_fd(&root->fd);
+		maildirsize_rebuild_later(root);
+	}
+
+	return 0;
+}
+
+struct quota_backend quota_backend_maildir = {
+	.name = "maildir",
+
+	.v = {
+		.alloc = maildir_quota_alloc,
+		.init = maildir_quota_init,
+		.deinit = maildir_quota_deinit,
+		.parse_rule = maildir_quota_parse_rule,
+		.init_limits = maildir_quota_init_limits,
+		.namespace_added = maildir_quota_namespace_added,
+		.get_resources = maildir_quota_root_get_resources,
+		.get_resource = maildir_quota_get_resource,
+		.update = maildir_quota_update,
+	}
+};
diff --git a/src/plugins/quota/quota-plugin.c b/src/plugins/quota/quota-plugin.c
new file mode 100644
index 0000000..507a329
--- /dev/null
+++ b/src/plugins/quota/quota-plugin.c
@@ -0,0 +1,31 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "mail-user.h"
+#include "mail-storage-hooks.h"
+#include "quota-plugin.h"
+
+void quota_backends_register(void);
+void quota_backends_unregister(void);
+
+const char *quota_plugin_version = DOVECOT_ABI_VERSION;
+
+static struct mail_storage_hooks quota_mail_storage_hooks = {
+	.mail_user_created = quota_mail_user_created,
+	.mail_namespaces_created = quota_mail_namespaces_created,
+	.mailbox_list_created = quota_mailbox_list_created,
+	.mailbox_allocated = quota_mailbox_allocated,
+	.mail_allocated = quota_mail_allocated
+};
+
+void quota_plugin_init(struct module *module)
+{
+	mail_storage_hooks_add(module, &quota_mail_storage_hooks);
+	quota_backends_register();
+}
+
+void quota_plugin_deinit(void)
+{
+	mail_storage_hooks_remove(&quota_mail_storage_hooks);
+	quota_backends_unregister();
+}
diff --git a/src/plugins/quota/quota-plugin.h b/src/plugins/quota/quota-plugin.h
new file mode 100644
index 0000000..927d428
--- /dev/null
+++ b/src/plugins/quota/quota-plugin.h
@@ -0,0 +1,36 @@
+#ifndef QUOTA_PLUGIN_H
+#define QUOTA_PLUGIN_H
+
+#include "module-context.h"
+#include "mail-user.h"
+
+struct module;
+struct mailbox;
+struct mailbox_list;
+struct mail;
+
+#define QUOTA_USER_CONTEXT(obj) \
+	MODULE_CONTEXT(obj, quota_user_module)
+#define QUOTA_USER_CONTEXT_REQUIRE(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, quota_user_module)
+
+struct quota_user {
+	union mail_user_module_context module_ctx;
+
+	struct quota *quota;
+};
+
+struct mail_storage;
+
+extern MODULE_CONTEXT_DEFINE(quota_user_module, &mail_user_module_register);
+
+void quota_mail_user_created(struct mail_user *user);
+void quota_mailbox_list_created(struct mailbox_list *list);
+void quota_mail_namespaces_created(struct mail_namespace *namespaces);
+void quota_mailbox_allocated(struct mailbox *box);
+void quota_mail_allocated(struct mail *mail);
+
+void quota_plugin_init(struct module *module);
+void quota_plugin_deinit(void);
+
+#endif
diff --git a/src/plugins/quota/quota-private.h b/src/plugins/quota/quota-private.h
new file mode 100644
index 0000000..ac091d3
--- /dev/null
+++ b/src/plugins/quota/quota-private.h
@@ -0,0 +1,230 @@
+#ifndef QUOTA_PRIVATE_H
+#define QUOTA_PRIVATE_H
+
+#include "mail-storage-private.h"
+#include "mail-namespace.h"
+#include "quota.h"
+
+/* Modules should use do "my_id = quota_module_id++" and
+   use quota_module_contexts[id] for their own purposes. */
+extern unsigned int quota_module_id;
+
+struct quota {
+	struct mail_user *user;
+	struct quota_settings *set;
+	struct event *event;
+
+	ARRAY(struct quota_root *) roots;
+	ARRAY(struct mail_namespace *) namespaces;
+	struct mail_namespace *unwanted_ns;
+};
+
+struct quota_settings {
+	pool_t pool;
+
+	ARRAY(struct quota_root_settings *) root_sets;
+	struct event *event;
+	enum quota_alloc_result (*test_alloc)(
+		struct quota_transaction_context *ctx, uoff_t size,
+		const char **error_r);
+
+	uoff_t max_mail_size;
+	const char *quota_exceeded_msg;
+	bool debug:1;
+	bool initialized:1;
+	bool vsizes:1;
+};
+
+struct quota_rule {
+	const char *mailbox_mask;
+
+	int64_t bytes_limit, count_limit;
+	/* relative to default_rule */
+	int bytes_percent, count_percent;
+
+	/* Don't include this mailbox in quota */
+	bool ignore:1;
+};
+
+struct quota_warning_rule {
+	struct quota_rule rule;
+	const char *command;
+	bool reverse:1;
+};
+
+struct quota_backend_vfuncs {
+	struct quota_root *(*alloc)(void);
+	int (*init)(struct quota_root *root, const char *args,
+		    const char **error_r);
+	void (*deinit)(struct quota_root *root);
+
+	bool (*parse_rule)(struct quota_root_settings *root_set,
+			   struct quota_rule *rule,
+			   const char *str, const char **error_r);
+	int (*init_limits)(struct quota_root *root, const char **error_r);
+
+	/* called once for each namespace */
+	void (*namespace_added)(struct quota *quota,
+				struct mail_namespace *ns);
+
+	const char *const *(*get_resources)(struct quota_root *root);
+	/* Backends return success as QUOTA_GET_RESULT_LIMITED, and returning
+	   QUOTA_GET_RESULT_UNLIMITED is prohibited by quota_get_resource(),
+	   which is the only caller of this vfunc. */
+	enum quota_get_result (*get_resource)(struct quota_root *root,
+					      const char *name,
+					      uint64_t *value_r,
+					      const char **error_r);
+
+	int (*update)(struct quota_root *root, 
+		      struct quota_transaction_context *ctx,
+		      const char **error_r);
+	bool (*match_box)(struct quota_root *root, struct mailbox *box);
+	void (*flush)(struct quota_root *root);
+};
+
+struct quota_backend {
+	/* quota backends equal if backend1.name == backend2.name */
+	const char *name;
+	struct event *event;
+	struct quota_backend_vfuncs v;
+};
+
+struct quota_root_settings {
+	/* Unique quota root name. */
+	const char *name;
+	/* Name in settings, e.g. "quota", "quota2", .. */
+	const char *set_name;
+
+	struct quota_settings *set;
+	const char *args;
+
+	const struct quota_backend *backend;
+	struct quota_rule default_rule;
+	ARRAY(struct quota_rule) rules;
+	ARRAY(struct quota_warning_rule) warning_rules;
+	const char *limit_set;
+
+	/* If user is under quota before saving a mail, allow the last mail to
+	   bring the user over quota by this many bytes. */
+	uint64_t last_mail_max_extra_bytes;
+	struct quota_rule grace_rule;
+
+	/* Limits in default_rule override backend's quota limits */
+	bool force_default_rule:1;
+	/* TRUE if any of the warning_rules have reverse==TRUE */
+	bool have_reverse_warnings:1;
+};
+
+struct quota_root {
+	pool_t pool;
+
+	struct quota_root_settings *set;
+	struct quota *quota;
+	struct quota_backend backend;
+	struct dict *limit_set_dict;
+
+	/* this quota root applies only to this namespace. it may also be
+	   a public namespace without an owner. */
+	struct mail_namespace *ns;
+	/* this is set in quota init(), because namespaces aren't known yet.
+	   when accessing shared users the ns_prefix may be non-NULL but
+	   ns=NULL, so when checking if quota root applies only to a specific
+	   namespace use the ns_prefix!=NULL check. */
+	const char *ns_prefix;
+
+	/* initially the same as set->default_rule.*_limit, but some backends
+	   may change these by reading the limits elsewhere (e.g. Maildir++,
+	   FS quota) */
+	int64_t bytes_limit, count_limit;
+
+	/* Module-specific contexts. See quota_module_id. */
+	ARRAY(void) quota_module_contexts;
+
+	/* don't enforce quota when saving */
+	bool no_enforcing:1;
+	/* quota is automatically updated. update() should be called but the
+	   bytes won't be changed. count is still changed, because it's cheap
+	   to do and it's internally used to figure out whether there have
+	   been some changes and that quota_warnings should be checked. */
+	bool auto_updating:1;
+	/* If user has unlimited quota, disable quota tracking */
+	bool disable_unlimited_tracking:1;
+	/* Set while quota is being recalculated to avoid recursion. */
+	bool recounting:1;
+	/* Quota root is hidden (to e.g. IMAP GETQUOTAROOT) */
+	bool hidden:1;
+	/* Did we already check quota_over_flag correctness? */
+	bool quota_over_flag_checked:1;
+};
+
+struct quota_transaction_context {
+	union mailbox_transaction_module_context module_ctx;
+
+	struct quota *quota;
+	struct mailbox *box;
+
+	int64_t bytes_used, count_used;
+	/* how many bytes/mails can be saved until limit is reached.
+	   (set once, not updated by bytes_used/count_used).
+
+	   if last_mail_max_extra_bytes>0, the bytes_ceil is initially
+	   increased by that much, while bytes_ceil2 contains the real ceiling.
+	   after the first allocation is done, bytes_ceil is set to
+	   bytes_ceil2. */
+	uint64_t bytes_ceil, bytes_ceil2, count_ceil;
+	/* How many bytes/mails we are over quota. Like *_ceil, these are set
+	   only once and not updated by bytes_used/count_used. (Either *_ceil
+	   or *_over is always zero.) */
+	uint64_t bytes_over, count_over;
+
+	struct mail *tmp_mail;
+	enum quota_recalculate recalculate;
+
+	bool limits_set:1;
+	bool failed:1;
+	bool sync_transaction:1;
+	/* TRUE if all roots have auto_updating=TRUE */
+	bool auto_updating:1;
+	/* Quota doesn't need to be updated within this transaction. */
+	bool no_quota_updates:1;
+};
+
+/* Register storage to all user's quota roots. */
+void quota_add_user_namespace(struct quota *quota, struct mail_namespace *ns);
+void quota_remove_user_namespace(struct mail_namespace *ns);
+
+int quota_root_default_init(struct quota_root *root, const char *args,
+			    const char **error_r);
+struct quota *quota_get_mail_user_quota(struct mail_user *user);
+
+bool quota_root_is_namespace_visible(struct quota_root *root,
+				     struct mail_namespace *ns);
+struct quota_rule *
+quota_root_rule_find(struct quota_root_settings *root_set, const char *name);
+
+void quota_root_recalculate_relative_rules(struct quota_root_settings *root_set,
+					   int64_t bytes_limit,
+					   int64_t count_limit);
+/* Returns 1 if values were returned successfully, 0 if we're recursing into
+   the same function, -1 if error. */
+int quota_count(struct quota_root *root, uint64_t *bytes_r, uint64_t *count_r,
+		enum quota_get_result *error_result_r, const char **error_r);
+
+int quota_root_parse_grace(struct quota_root_settings *root_set,
+			   const char *value, const char **error_r);
+bool quota_warning_match(const struct quota_warning_rule *w,
+			 uint64_t bytes_before, uint64_t bytes_current,
+			 uint64_t count_before, uint64_t count_current,
+			 const char **reason_r);
+bool quota_transaction_is_over(struct quota_transaction_context *ctx, uoff_t size);
+int quota_transaction_set_limits(struct quota_transaction_context *ctx,
+				 enum quota_get_result *error_result_r,
+				 const char **error_r);
+
+void quota_backend_register(const struct quota_backend *backend);
+void quota_backend_unregister(const struct quota_backend *backend);
+
+#define QUOTA_UNKNOWN_RESOURCE_ERROR_STRING "Unknown quota resource"
+
+#endif
diff --git a/src/plugins/quota/quota-status-settings.c b/src/plugins/quota/quota-status-settings.c
new file mode 100644
index 0000000..e98cc09
--- /dev/null
+++ b/src/plugins/quota/quota-status-settings.c
@@ -0,0 +1,37 @@
+/* Copyright (c) 2017-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "mail-storage-settings.h"
+#include "quota-status-settings.h"
+
+#undef DEF
+#define DEF(type, name) \
+	SETTING_DEFINE_STRUCT_##type(#name, name, struct quota_status_settings)
+
+static const struct setting_define quota_status_setting_defines[] = {
+	DEF(STR, recipient_delimiter),
+
+	SETTING_DEFINE_LIST_END
+};
+
+static const struct quota_status_settings quota_status_default_settings = {
+	.recipient_delimiter = "+",
+};
+
+static const struct setting_parser_info *quota_status_setting_dependencies[] = {
+	NULL
+};
+
+const struct setting_parser_info quota_status_setting_parser_info = {
+	.module_name = "mail",
+	.defines = quota_status_setting_defines,
+	.defaults = &quota_status_default_settings,
+
+	.type_offset = SIZE_MAX,
+	.struct_size = sizeof(struct quota_status_settings),
+
+	.parent_offset = SIZE_MAX,
+	.dependencies = quota_status_setting_dependencies
+};
diff --git a/src/plugins/quota/quota-status-settings.h b/src/plugins/quota/quota-status-settings.h
new file mode 100644
index 0000000..e69a0aa
--- /dev/null
+++ b/src/plugins/quota/quota-status-settings.h
@@ -0,0 +1,10 @@
+#ifndef QUOTA_STATUS_SETTINGS_H
+#define QUOTA_STATUS_SETTINGS_H 1
+
+struct quota_status_settings {
+	const char *recipient_delimiter;
+};
+
+extern const struct setting_parser_info quota_status_setting_parser_info;
+
+#endif
diff --git a/src/plugins/quota/quota-status.c b/src/plugins/quota/quota-status.c
new file mode 100644
index 0000000..7db0cb4
--- /dev/null
+++ b/src/plugins/quota/quota-status.c
@@ -0,0 +1,360 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "ostream.h"
+#include "connection.h"
+#include "restrict-access.h"
+#include "settings-parser.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "mail-namespace.h"
+#include "mail-storage.h"
+#include "mail-storage-settings.h"
+#include "mail-storage-service.h"
+#include "smtp-address.h"
+#include "quota-private.h"
+#include "quota-plugin.h"
+#include "quota-status-settings.h"
+
+enum quota_protocol {
+	QUOTA_PROTOCOL_UNKNOWN = 0,
+	QUOTA_PROTOCOL_POSTFIX
+};
+
+struct quota_client {
+	struct connection conn;
+
+	struct event *event;
+
+	char *state;
+	char *recipient;
+	uoff_t size;
+
+	bool warned_bad_state:1;
+};
+
+static struct event_category event_category_quota_status = {
+	.name = "quota-status"
+};
+
+static struct quota_status_settings *quota_status_settings;
+static pool_t quota_status_pool;
+static enum quota_protocol protocol;
+static struct mail_storage_service_ctx *storage_service;
+static struct connection_list *clients;
+static char *nouser_reply;
+
+static void client_connected(struct master_service_connection *conn)
+{
+	struct quota_client *client;
+
+	client = i_new(struct quota_client, 1);
+
+	client->event = event_create(NULL);
+	client->conn.event_parent = client->event;
+	event_add_category(client->event, &event_category_quota_status);
+	connection_init_server(clients, &client->conn,
+			       "quota-client", conn->fd, conn->fd);
+	master_service_client_connection_accept(conn);
+
+	e_debug(client->event, "Client connected");
+}
+
+static void client_reset(struct quota_client *client)
+{
+	i_free(client->state);
+	i_free(client->recipient);
+}
+
+static enum quota_alloc_result
+quota_check(struct mail_user *user, uoff_t mail_size, const char **error_r)
+{
+	struct quota_user *quser = QUOTA_USER_CONTEXT(user);
+	struct mail_namespace *ns;
+	struct mailbox *box;
+	struct quota_transaction_context *ctx;
+	enum quota_alloc_result ret;
+
+	if (quser == NULL) {
+		/* no quota for user */
+		e_debug(user->event, "User has no quota");
+		return QUOTA_ALLOC_RESULT_OK;
+	}
+
+	ns = mail_namespace_find_inbox(user->namespaces);
+	box = mailbox_alloc(ns->list, "INBOX", MAILBOX_FLAG_POST_SESSION);
+
+	ctx = quota_transaction_begin(box);
+	const char *internal_error;
+	ret = quota_test_alloc(ctx, I_MAX(1, mail_size), &internal_error);
+	if (ret == QUOTA_ALLOC_RESULT_TEMPFAIL)
+		e_error(user->event, "quota check failed: %s", internal_error);
+	*error_r = quota_alloc_result_errstr(ret, ctx);
+	quota_transaction_rollback(&ctx);
+
+	mailbox_free(&box);
+	return ret;
+}
+
+static int client_check_mta_state(struct quota_client *client)
+{
+	if (client->state == NULL || strcasecmp(client->state, "RCPT") == 0)
+		return 0;
+
+	if (!client->warned_bad_state) {
+		e_warning(client->event,
+		          "Received policy query from MTA in unexpected state %s "
+		          "(service can only be used for recipient restrictions)",
+		          client->state);
+	}
+	client->warned_bad_state = TRUE;
+	return -1;
+}
+
+static void client_handle_request(struct quota_client *client)
+{
+	struct mail_storage_service_input input;
+	struct mail_storage_service_user *service_user;
+	struct mail_user *user;
+	struct smtp_address *rcpt;
+	const char *value = NULL, *error;
+	const char *detail ATTR_UNUSED;
+	char delim ATTR_UNUSED;
+	string_t *resp;
+	int ret;
+
+	if (client_check_mta_state(client) < 0 || client->recipient == NULL) {
+		e_debug(client->event, "Response: action=DUNNO");
+		o_stream_nsend_str(client->conn.output, "action=DUNNO\n\n");
+		return;
+	}
+
+	if (smtp_address_parse_path(pool_datastack_create(), client->recipient,
+				    SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART |
+				    SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL |
+				    SMTP_ADDRESS_PARSE_FLAG_ALLOW_BAD_LOCALPART,
+				    &rcpt, &error) < 0) {
+		e_error(client->event,
+			"Client sent invalid recipient address `%s': "
+			"%s", str_sanitize(client->recipient, 256), error);
+		e_debug(client->event, "Response: action=DUNNO");
+		o_stream_nsend_str(client->conn.output, "action=DUNNO\n\n");
+		return;
+	}
+
+	i_zero(&input);
+	input.event_parent = client->event;
+	smtp_address_detail_parse_temp(quota_status_settings->recipient_delimiter,
+				       rcpt, &input.username, &delim,
+				       &detail);
+	ret = mail_storage_service_lookup_next(storage_service, &input,
+					       &service_user, &user, &error);
+	restrict_access_allow_coredumps(TRUE);
+	if (ret == 0) {
+		e_debug(client->event, "User `%s' not found", input.username);
+		value = nouser_reply;
+	} else if (ret > 0) {
+		enum quota_alloc_result qret = quota_check(user, client->size,
+							   &error);
+		if (qret == QUOTA_ALLOC_RESULT_OK) {
+			e_debug(client->event,
+				"Message is acceptable");
+		} else {
+			e_debug(client->event,
+				"Quota check failed: %s", error);
+		}
+
+		switch (qret) {
+		case QUOTA_ALLOC_RESULT_OK: /* under quota */
+			value = mail_user_plugin_getenv(user,
+						"quota_status_success");
+			if (value == NULL)
+				value = "OK";
+			break;
+		case QUOTA_ALLOC_RESULT_OVER_MAXSIZE:
+		/* even over maximum quota */
+		case QUOTA_ALLOC_RESULT_OVER_QUOTA_LIMIT:
+			value = mail_user_plugin_getenv(user,
+						"quota_status_toolarge");
+			/* fall through */
+		case QUOTA_ALLOC_RESULT_OVER_QUOTA:
+			if (value == NULL)
+				value = mail_user_plugin_getenv(user,
+						"quota_status_overquota");
+			if (value == NULL)
+				value = t_strdup_printf("554 5.2.2 %s", error);
+			break;
+		case QUOTA_ALLOC_RESULT_TEMPFAIL:
+		case QUOTA_ALLOC_RESULT_BACKGROUND_CALC:
+			ret = -1;
+			break;
+		}
+		value = t_strdup(value); /* user's pool is being freed */
+		mail_user_deinit(&user);
+		mail_storage_service_user_unref(&service_user);
+	} else {
+		e_error(client->event,
+			"Failed to lookup user %s: %s", input.username, error);
+		error = "Temporary internal error";
+	}
+
+	resp = t_str_new(256);
+	if (ret < 0) {
+		/* temporary failure */
+		str_append(resp, "action=DEFER_IF_PERMIT ");
+		str_append(resp, error);
+	} else {
+		str_append(resp, "action=");
+		str_append(resp, value);
+	}
+
+	e_debug(client->event, "Response: %s", str_c(resp));
+	str_append(resp, "\n\n");
+	o_stream_nsend_str(client->conn.output, str_c(resp));
+}
+
+static int client_input_line(struct connection *conn, const char *line)
+{
+	struct quota_client *client = (struct quota_client *)conn;
+
+	e_debug(client->event, "Request: %s", str_sanitize(line, 1024));
+
+	if (*line == '\0') {
+		o_stream_cork(conn->output);
+		client_handle_request(client);
+		o_stream_uncork(conn->output);
+		client_reset(client);
+		return 1;
+	}
+	if (str_begins(line, "recipient=")) {
+		if (client->recipient == NULL)
+			client->recipient = i_strdup(line + 10);
+	} else if (str_begins(line, "size=")) {
+		if (str_to_uoff(line+5, &client->size) < 0)
+			client->size = 0;
+	} else if (str_begins(line, "protocol_state=")) {
+		if (client->state == NULL)
+			client->state = i_strdup(line + 15);
+	}
+	return 1;
+}
+
+static void client_destroy(struct connection *conn)
+{
+	struct quota_client *client = (struct quota_client *)conn;
+
+	e_debug(client->event, "Client disconnected");
+
+	connection_deinit(&client->conn);
+	client_reset(client);
+	event_unref(&client->event);
+	i_free(client);
+
+	master_service_client_connection_destroyed(master_service);
+}
+
+static struct connection_settings client_set = {
+	.input_max_size = SIZE_MAX,
+	.output_max_size = SIZE_MAX,
+	.client = FALSE
+};
+
+static const struct connection_vfuncs client_vfuncs = {
+	.destroy = client_destroy,
+	.input_line = client_input_line
+};
+
+static void main_preinit(void)
+{
+	restrict_access_by_env(RESTRICT_ACCESS_FLAG_ALLOW_ROOT, NULL);
+	restrict_access_allow_coredumps(TRUE);
+}
+
+static void main_init(void)
+{
+	static const struct setting_parser_info *set_roots[] = {
+		&quota_status_setting_parser_info,
+		NULL
+	};
+	struct mail_storage_service_input input;
+	const struct setting_parser_info *user_info;
+	const struct setting_parser_context *set_parser;
+	const struct mail_user_settings *user_set;
+	const struct quota_status_settings *set;
+	const char *value, *error;
+	pool_t pool;
+
+	clients = connection_list_init(&client_set, &client_vfuncs);
+	storage_service = mail_storage_service_init(master_service, set_roots,
+		MAIL_STORAGE_SERVICE_FLAG_ALLOW_ROOT |
+		MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP |
+		MAIL_STORAGE_SERVICE_FLAG_TEMP_PRIV_DROP |
+		MAIL_STORAGE_SERVICE_FLAG_ENABLE_CORE_DUMPS |
+		MAIL_STORAGE_SERVICE_FLAG_NO_CHDIR);
+
+	i_zero(&input);
+	input.service = "quota-status";
+	input.module = "mail";
+	input.username = "";
+
+	quota_status_pool = pool_alloconly_create("quota status settings", 512);
+	pool = pool_alloconly_create("service all settings", 4096);
+	if (mail_storage_service_read_settings(storage_service, &input, pool,
+					       &user_info, &set_parser,
+					       &error) < 0)
+		i_fatal("%s", error);
+	user_set = master_service_settings_parser_get_others(master_service,
+							     set_parser)[0];
+	set = master_service_settings_get_others(master_service)[1];
+
+	quota_status_settings = settings_dup(&quota_status_setting_parser_info, set,
+					     quota_status_pool);
+	value = mail_user_set_plugin_getenv(user_set, "quota_status_nouser");
+	nouser_reply = p_strdup(quota_status_pool,
+				value != NULL ? value : "REJECT Unknown user");
+	pool_unref(&pool);
+}
+
+static void main_deinit(void)
+{
+	pool_unref(&quota_status_pool);
+	connection_list_deinit(&clients);
+	mail_storage_service_deinit(&storage_service);
+}
+
+int main(int argc, char *argv[])
+{
+	enum master_service_flags service_flags =
+		MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN;
+	int c;
+
+	protocol = QUOTA_PROTOCOL_UNKNOWN;
+	master_service = master_service_init("quota-status", service_flags,
+					     &argc, &argv, "p:");
+	while ((c = master_getopt(master_service)) > 0) {
+		switch (c) {
+		case 'p':
+			if (strcmp(optarg, "postfix") == 0)
+				protocol = QUOTA_PROTOCOL_POSTFIX;
+			else
+				i_fatal("Unknown -p parameter: '%s'", optarg);
+			break;
+		default:
+			return FATAL_DEFAULT;
+		}
+	}
+	if (protocol == QUOTA_PROTOCOL_UNKNOWN)
+		i_fatal("Missing -p parameter");
+
+	master_service_init_log(master_service);
+	main_preinit();
+
+	main_init();
+	master_service_init_finish(master_service);
+	master_service_run(master_service, client_connected);
+	main_deinit();
+	master_service_deinit(&master_service);
+	return 0;
+}
diff --git a/src/plugins/quota/quota-storage.c b/src/plugins/quota/quota-storage.c
new file mode 100644
index 0000000..a1d08ee
--- /dev/null
+++ b/src/plugins/quota/quota-storage.c
@@ -0,0 +1,780 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "istream.h"
+#include "mail-search-build.h"
+#include "mail-storage-private.h"
+#include "mailbox-list-private.h"
+#include "maildir-storage.h"
+#include "index-mailbox-size.h"
+#include "quota-private.h"
+#include "quota-plugin.h"
+
+#include <sys/stat.h>
+
+#define QUOTA_CONTEXT(obj) \
+	MODULE_CONTEXT(obj, quota_storage_module)
+#define QUOTA_CONTEXT_REQUIRE(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, quota_storage_module)
+#define QUOTA_MAIL_CONTEXT(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, quota_mail_module)
+#define QUOTA_LIST_CONTEXT(obj) \
+	MODULE_CONTEXT(obj, quota_mailbox_list_module)
+
+struct quota_mailbox_list {
+	union mailbox_list_module_context module_ctx;
+};
+
+struct quota_mailbox {
+	union mailbox_module_context module_ctx;
+
+	struct mailbox_transaction_context *expunge_trans;
+	struct quota_transaction_context *expunge_qt;
+	ARRAY(uint32_t) expunge_uids;
+	ARRAY(uoff_t) expunge_sizes;
+	unsigned int prev_idx;
+
+	bool recalculate:1;
+	bool sync_transaction_expunge:1;
+};
+
+struct quota_user_module quota_user_module =
+	MODULE_CONTEXT_INIT(&mail_user_module_register);
+
+static MODULE_CONTEXT_DEFINE_INIT(quota_storage_module,
+				  &mail_storage_module_register);
+static MODULE_CONTEXT_DEFINE_INIT(quota_mail_module, &mail_module_register);
+static MODULE_CONTEXT_DEFINE_INIT(quota_mailbox_list_module,
+				  &mailbox_list_module_register);
+
+static void quota_set_storage_error(struct quota_transaction_context *qt,
+				    struct mailbox *box,
+				    enum quota_alloc_result res,
+				    const char *internal_err)
+{
+	const char *errstr = quota_alloc_result_errstr(res, qt);
+	struct mail_storage *storage = box->storage;
+	switch (res) {
+	case QUOTA_ALLOC_RESULT_OVER_MAXSIZE:
+		mail_storage_set_error(storage, MAIL_ERROR_LIMIT, errstr);
+		break;
+	case QUOTA_ALLOC_RESULT_OVER_QUOTA_LIMIT:
+	case QUOTA_ALLOC_RESULT_OVER_QUOTA:
+		mail_storage_set_error(storage, MAIL_ERROR_NOQUOTA, errstr);
+		break;
+	case QUOTA_ALLOC_RESULT_TEMPFAIL:
+	case QUOTA_ALLOC_RESULT_BACKGROUND_CALC:
+		mailbox_set_critical(box, "quota: %s", internal_err);
+		break;
+	case QUOTA_ALLOC_RESULT_OK:
+		i_unreached();
+	}
+}
+
+static void quota_mail_expunge(struct mail *_mail)
+{
+	struct mail_private *mail = (struct mail_private *)_mail;
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(_mail->box);
+	struct quota_user *quser = QUOTA_USER_CONTEXT_REQUIRE(_mail->box->storage->user);
+	union mail_module_context *qmail = QUOTA_MAIL_CONTEXT(mail);
+	struct quota_transaction_context *qt = QUOTA_CONTEXT_REQUIRE(_mail->transaction);
+	uoff_t size;
+	int ret;
+
+	if (qt->auto_updating) {
+		qmail->super.expunge(_mail);
+		return;
+	}
+
+	/* We need to handle the situation where multiple transactions expunged
+	   the mail at the same time. In here we'll just save the message's
+	   physical size and do the quota freeing later when the message was
+	   known to be expunged. */
+	if (quser->quota->set->vsizes)
+		ret = mail_get_virtual_size(_mail, &size);
+	else
+		ret = mail_get_physical_size(_mail, &size);
+	if (ret == 0) {
+		if (!array_is_created(&qbox->expunge_uids)) {
+			i_array_init(&qbox->expunge_uids, 64);
+			i_array_init(&qbox->expunge_sizes, 64);
+		}
+		array_push_back(&qbox->expunge_uids, &_mail->uid);
+		array_push_back(&qbox->expunge_sizes, &size);
+		if ((_mail->transaction->flags & MAILBOX_TRANSACTION_FLAG_SYNC) != 0) {
+			/* we're running dsync. if this brings the quota below
+			   a negative quota warning, don't execute it, because
+			   it probably was already executed by the replica. */
+			qbox->sync_transaction_expunge = TRUE;
+		} else {
+			qbox->sync_transaction_expunge = FALSE;
+		}
+	}
+
+	qmail->super.expunge(_mail);
+}
+
+static int
+quota_get_status(struct mailbox *box, enum mailbox_status_items items,
+		 struct mailbox_status *status_r)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(box);
+	struct quota_transaction_context *qt;
+	int ret = 0;
+
+	if ((items & STATUS_CHECK_OVER_QUOTA) != 0) {
+		qt = quota_transaction_begin(box);
+		const char *error;
+		enum quota_alloc_result qret = quota_test_alloc(qt, 0, &error);
+		if (qret != QUOTA_ALLOC_RESULT_OK) {
+			quota_set_storage_error(qt, box, qret, error);
+			ret = -1;
+		}
+		quota_transaction_rollback(&qt);
+
+		if ((items & ENUM_NEGATE(STATUS_CHECK_OVER_QUOTA)) == 0) {
+			/* don't bother calling parent, it may unnecessarily
+			   try to open the mailbox */
+			return ret < 0 ? -1 : 0;
+		}
+	}
+
+	if (qbox->module_ctx.super.get_status(box, items, status_r) < 0)
+		ret = -1;
+	return ret < 0 ? -1 : 0;
+}
+
+static struct mailbox_transaction_context *
+quota_mailbox_transaction_begin(struct mailbox *box,
+				enum mailbox_transaction_flags flags,
+				const char *reason)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(box);
+	struct mailbox_transaction_context *t;
+	struct quota_transaction_context *qt;
+
+	t = qbox->module_ctx.super.transaction_begin(box, flags, reason);
+	qt = quota_transaction_begin(box);
+	qt->sync_transaction = (flags & MAILBOX_TRANSACTION_FLAG_SYNC) != 0;
+
+	MODULE_CONTEXT_SET(t, quota_storage_module, qt);
+	return t;
+}
+
+static int
+quota_mailbox_transaction_commit(struct mailbox_transaction_context *ctx,
+				 struct mail_transaction_commit_changes *changes_r)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(ctx->box);
+	struct quota_transaction_context *qt = QUOTA_CONTEXT_REQUIRE(ctx);
+
+	i_assert(qt->tmp_mail == NULL);
+
+	if (qbox->module_ctx.super.transaction_commit(ctx, changes_r) < 0) {
+		quota_transaction_rollback(&qt);
+		return -1;
+	} else {
+		(void)quota_transaction_commit(&qt);
+		return 0;
+	}
+}
+
+static void
+quota_mailbox_transaction_rollback(struct mailbox_transaction_context *ctx)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(ctx->box);
+	struct quota_transaction_context *qt = QUOTA_CONTEXT_REQUIRE(ctx);
+
+	i_assert(qt->tmp_mail == NULL);
+
+	qbox->module_ctx.super.transaction_rollback(ctx);
+	quota_transaction_rollback(&qt);
+}
+
+void quota_mail_allocated(struct mail *_mail)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT(_mail->box);
+	struct mail_private *mail = (struct mail_private *)_mail;
+	struct mail_vfuncs *v = mail->vlast;
+	union mail_module_context *qmail;
+
+	if (qbox == NULL)
+		return;
+
+	qmail = p_new(mail->pool, union mail_module_context, 1);
+	qmail->super = *v;
+	mail->vlast = &qmail->super;
+
+	v->expunge = quota_mail_expunge;
+	MODULE_CONTEXT_SET_SELF(mail, quota_mail_module, qmail);
+}
+
+static bool
+quota_move_requires_check(struct mailbox *dest_box, struct mailbox *src_box)
+{
+	struct mail_namespace *src_ns = src_box->list->ns;
+	struct mail_namespace *dest_ns = dest_box->list->ns;
+	struct quota_user *quser = QUOTA_USER_CONTEXT_REQUIRE(src_ns->user);
+	struct quota_root *const *rootp;
+
+	array_foreach(&quser->quota->roots, rootp) {
+		bool have_src_quota, have_dest_quota;
+
+		have_src_quota = quota_root_is_namespace_visible(*rootp, src_ns);
+		have_dest_quota = quota_root_is_namespace_visible(*rootp, dest_ns);
+		if (have_src_quota == have_dest_quota) {
+			/* Both/neither have this quota */
+		} else if (have_dest_quota) {
+			/* Destination mailbox has a quota that doesn't exist
+			   in source. We'll need to check if it's being
+			   exceeded. */
+			return TRUE;
+		} else {
+			/* Source mailbox has a quota root that doesn't exist
+			   in destination. We're not increasing the source
+			   quota, so ignore it. */
+		}
+	}
+	return FALSE;
+}
+
+static int quota_check(struct mail_save_context *ctx, struct mailbox *src_box)
+{
+	struct mailbox_transaction_context *t = ctx->transaction;
+	struct quota_transaction_context *qt = QUOTA_CONTEXT_REQUIRE(t);
+	enum quota_alloc_result ret;
+
+	i_assert(!ctx->moving || src_box != NULL);
+
+	if (ctx->moving &&
+	     !quota_move_requires_check(ctx->transaction->box, src_box)) {
+		/* the mail is being moved. the quota won't increase (after
+		   the following expunge), so allow this even if user is
+		   currently over quota */
+		quota_alloc(qt, ctx->dest_mail);
+		return 0;
+	} else if (qt->failed) {
+		return 0;
+	}
+
+	const char *error;
+	ret = quota_try_alloc(qt, ctx->dest_mail, &error);
+	switch (ret) {
+	case QUOTA_ALLOC_RESULT_OK:
+		return 0;
+	case QUOTA_ALLOC_RESULT_TEMPFAIL:
+		/* Log the error, but allow saving anyway. */
+		e_error(qt->quota->event,
+			"Failed to check if user is under quota: %s - "
+			"saving mail anyway", error);
+		return 0;
+	case QUOTA_ALLOC_RESULT_BACKGROUND_CALC:
+		/* Could not determine if there is enough space due to ongoing
+		   background quota calculation, allow saving anyway. */
+		e_warning(qt->quota->event,
+			  "Failed to check if user is under quota: %s - "
+			  "saving mail anyway", error);
+		return 0;
+	default:
+		quota_set_storage_error(qt, t->box, ret, error);
+		return -1;
+	}
+}
+
+static int
+quota_copy(struct mail_save_context *ctx, struct mail *mail)
+{
+	struct mailbox_transaction_context *t = ctx->transaction;
+	struct quota_transaction_context *qt = QUOTA_CONTEXT_REQUIRE(t);
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(t->box);
+
+	/* we always want to know the mail size */
+	mail_add_temp_wanted_fields(ctx->dest_mail, MAIL_FETCH_PHYSICAL_SIZE, NULL);
+
+	/* get quota before copying any mails. this avoids dovecot-vsize.lock
+	   deadlocks with backends that lock mails for expunging/copying. */
+	enum quota_get_result error_res;
+	const char *error;
+	if (quota_transaction_set_limits(qt, &error_res, &error) < 0) {
+		if (error_res == QUOTA_GET_RESULT_BACKGROUND_CALC) {
+			e_warning(qt->quota->event,
+				  "%s - copying mail anyway", error);
+		} else {
+			e_error(qt->quota->event,
+				"%s - copying mail anyway", error);
+		}
+	}
+
+	if (qbox->module_ctx.super.copy(ctx, mail) < 0)
+		return -1;
+
+	if (ctx->copying_via_save) {
+		/* copying used saving internally, we already checked the
+		   quota */
+		return 0;
+	}
+	return quota_check(ctx, mail->box);
+}
+
+static int
+quota_save_begin(struct mail_save_context *ctx, struct istream *input)
+{
+	struct mailbox_transaction_context *t = ctx->transaction;
+	struct quota_transaction_context *qt = QUOTA_CONTEXT_REQUIRE(t);
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(t->box);
+	const char *error;
+	uoff_t size;
+
+	if (!ctx->moving && i_stream_get_size(input, TRUE, &size) > 0 &&
+	    !qt->failed) {
+		/* Input size is known, check for quota immediately. This
+		   check isn't perfect, especially because input stream's
+		   linefeeds may contain CR+LFs while physical message would
+		   only contain LFs. With mbox some headers might be skipped
+		   entirely.
+
+		   I think these don't really matter though compared to the
+		   benefit of giving "out of quota" error before sending the
+		   full mail. */
+
+		enum quota_alloc_result qret = quota_test_alloc(qt, size, &error);
+		switch (qret) {
+		case QUOTA_ALLOC_RESULT_OK:
+			/* Great, there is space. */
+			break;
+		case QUOTA_ALLOC_RESULT_TEMPFAIL:
+			/* Log the error, but allow saving anyway. */
+			e_error(qt->quota->event,
+				"Failed to check if user is under quota: %s - "
+				"saving mail anyway", error);
+			break;
+		case QUOTA_ALLOC_RESULT_BACKGROUND_CALC:
+			/* Could not determine if there is enough space due to
+			 * ongoing background quota calculation, allow saving
+			 * anyway. */
+			e_warning(qt->quota->event,
+				  "Failed to check if user is under quota: %s - "
+				  "saving mail anyway", error);
+			break;
+		default:
+			quota_set_storage_error(qt, t->box, qret, error);
+			return -1;
+		}
+	}
+
+	/* we always want to know the mail size */
+	mail_add_temp_wanted_fields(ctx->dest_mail, MAIL_FETCH_PHYSICAL_SIZE, NULL);
+
+	/* get quota before copying any mails. this avoids dovecot-vsize.lock
+	   deadlocks with backends that lock mails for expunging/copying. */
+	enum quota_get_result error_res;
+	if (quota_transaction_set_limits(qt, &error_res, &error) < 0) {
+		if (error_res == QUOTA_GET_RESULT_BACKGROUND_CALC)
+			e_warning(qt->quota->event,
+				  "%s - saving mail anyway", error);
+		else
+			e_error(qt->quota->event,
+				"%s - saving mail anyway", error);
+	}
+
+	return qbox->module_ctx.super.save_begin(ctx, input);
+}
+
+static int quota_save_finish(struct mail_save_context *ctx)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(ctx->transaction->box);
+	struct mailbox *src_box;
+
+	if (qbox->module_ctx.super.save_finish(ctx) < 0)
+		return -1;
+
+	src_box = ctx->copy_src_mail == NULL ? NULL : ctx->copy_src_mail->box;
+	return quota_check(ctx, src_box);
+}
+
+static void quota_mailbox_sync_cleanup(struct quota_mailbox *qbox)
+{
+	if (array_is_created(&qbox->expunge_uids)) {
+		array_clear(&qbox->expunge_uids);
+		array_clear(&qbox->expunge_sizes);
+	}
+
+	if (qbox->expunge_qt != NULL && qbox->expunge_qt->tmp_mail != NULL) {
+		mail_free(&qbox->expunge_qt->tmp_mail);
+		(void)mailbox_transaction_commit(&qbox->expunge_trans);
+	}
+	qbox->sync_transaction_expunge = FALSE;
+}
+
+static void quota_mailbox_sync_commit(struct quota_mailbox *qbox)
+{
+	quota_mailbox_sync_cleanup(qbox);
+	if (qbox->expunge_qt != NULL)
+		(void)quota_transaction_commit(&qbox->expunge_qt);
+	qbox->recalculate = FALSE;
+}
+
+static void quota_mailbox_sync_notify(struct mailbox *box, uint32_t uid,
+				      enum mailbox_sync_type sync_type)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(box);
+	struct index_mailbox_context *ibox = INDEX_STORAGE_CONTEXT(box);
+	struct quota_user *quser = QUOTA_USER_CONTEXT_REQUIRE(box->storage->user);
+	const uint32_t *uids;
+	const uoff_t *sizep;
+	unsigned int i, count;
+	uoff_t size;
+
+	if (qbox->module_ctx.super.sync_notify != NULL)
+		qbox->module_ctx.super.sync_notify(box, uid, sync_type);
+
+	if (sync_type != MAILBOX_SYNC_TYPE_EXPUNGE || qbox->recalculate ||
+	    (box->flags & MAILBOX_FLAG_DELETE_UNSAFE) != 0) {
+		if (uid == 0) {
+			/* free the transaction before view syncing begins,
+			   otherwise it'll crash. */
+			quota_mailbox_sync_cleanup(qbox);
+		}
+		return;
+	}
+
+	if (qbox->expunge_qt == NULL) {
+		qbox->expunge_qt = quota_transaction_begin(box);
+		qbox->expunge_qt->sync_transaction =
+			qbox->sync_transaction_expunge;
+	}
+	if (qbox->expunge_qt->auto_updating) {
+		/* even though backend doesn't care about size/count changes,
+		   make sure count_used changes so quota_warnings are
+		   executed */
+		quota_free_bytes(qbox->expunge_qt, 0);
+		return;
+	}
+
+	/* we're in the middle of syncing the mailbox, so it's a bad idea to
+	   try and get the message sizes at this point. Rely on sizes that
+	   we saved earlier, or recalculate the whole quota if we don't know
+	   the size. */
+	if (!array_is_created(&qbox->expunge_uids) ||
+	    array_is_empty(&qbox->expunge_uids)) {
+		i = count = 0;
+	} else {
+		uids = array_get(&qbox->expunge_uids, &count);
+		for (i = qbox->prev_idx; i < count; i++) {
+			if (uids[i] == uid)
+				break;
+		}
+		if (i >= count) {
+			for (i = 0; i < qbox->prev_idx; i++) {
+				if (uids[i] == uid)
+					break;
+			}
+			if (i == qbox->prev_idx)
+				i = count;
+		}
+		qbox->prev_idx = i;
+	}
+
+	if (i != count) {
+		/* we already know the size */
+		sizep = array_idx(&qbox->expunge_sizes, i);
+		quota_free_bytes(qbox->expunge_qt, *sizep);
+		/* FIXME: it's not ideal that we do the vsize update here, but
+		   this is the easiest place for it for now.. maybe the mail
+		   size checking code could be moved to lib-storage */
+		if (ibox->vsize_update != NULL && quser->quota->set->vsizes)
+			index_mailbox_vsize_hdr_expunge(ibox->vsize_update, uid, *sizep);
+		return;
+	}
+
+	/* try to look up the size. this works only if it's cached. */
+	if (qbox->expunge_qt->tmp_mail == NULL) {
+		/* FIXME: ugly kludge to open the transaction for sync_view.
+		   box->view may not have all the new messages that
+		   sync_notify() notifies about, and those messages would
+		   cause a quota recalculation. */
+		struct mail_index_view *box_view = box->view;
+		if (box->tmp_sync_view != NULL)
+			box->view = box->tmp_sync_view;
+		qbox->expunge_trans = mailbox_transaction_begin(box, 0, "quota");
+		box->view = box_view;
+		qbox->expunge_qt->tmp_mail =
+			mail_alloc(qbox->expunge_trans,
+				   MAIL_FETCH_PHYSICAL_SIZE, NULL);
+	}
+	if (!mail_set_uid(qbox->expunge_qt->tmp_mail, uid))
+		;
+	else if (!quser->quota->set->vsizes) {
+		if (mail_get_physical_size(qbox->expunge_qt->tmp_mail, &size) == 0) {
+			quota_free_bytes(qbox->expunge_qt, size);
+			return;
+		}
+	} else if (mail_get_virtual_size(qbox->expunge_qt->tmp_mail, &size) == 0) {
+		quota_free_bytes(qbox->expunge_qt, size);
+		if (ibox->vsize_update != NULL)
+			index_mailbox_vsize_hdr_expunge(ibox->vsize_update, uid, size);
+	} else {
+		/* there's no way to get the size. recalculate the quota. */
+		quota_recalculate(qbox->expunge_qt, QUOTA_RECALCULATE_MISSING_FREES);
+		qbox->recalculate = TRUE;
+	}
+}
+
+static int quota_mailbox_sync_deinit(struct mailbox_sync_context *ctx,
+				     struct mailbox_sync_status *status_r)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(ctx->box);
+	int ret;
+
+	ret = qbox->module_ctx.super.sync_deinit(ctx, status_r);
+	/* update quota only after syncing is finished. the quota commit may
+	   recalculate the quota and cause all mailboxes to be synced,
+	   including the one we're already syncing. */
+	quota_mailbox_sync_commit(qbox);
+	return ret;
+}
+
+static void quota_roots_flush(struct quota *quota)
+{
+	struct quota_root *const *roots;
+	unsigned int i, count;
+
+	roots = array_get(&quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		if (roots[i]->backend.v.flush != NULL)
+			roots[i]->backend.v.flush(roots[i]);
+	}
+}
+
+static void quota_mailbox_close(struct mailbox *box)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(box);
+	struct quota_user *quser = QUOTA_USER_CONTEXT_REQUIRE(box->storage->user);
+
+	/* sync_notify() may be called outside sync_begin()..sync_deinit().
+	   make sure we apply changes at close time at latest. */
+	quota_mailbox_sync_commit(qbox);
+
+	/* make sure quota backend flushes all data. this could also be done
+	   somewhat later, but user.deinit() is too late, since the flushing
+	   can trigger quota recalculation which isn't safe to do anymore
+	   at user.deinit() when most of the loaded plugins have already been
+	   deinitialized. */
+	quota_roots_flush(quser->quota);
+
+	qbox->module_ctx.super.close(box);
+}
+
+static void quota_mailbox_free(struct mailbox *box)
+{
+	struct quota_mailbox *qbox = QUOTA_CONTEXT_REQUIRE(box);
+
+	if (array_is_created(&qbox->expunge_uids)) {
+		array_free(&qbox->expunge_uids);
+		array_free(&qbox->expunge_sizes);
+	}
+	i_assert(qbox->expunge_qt == NULL ||
+		 qbox->expunge_qt->tmp_mail == NULL);
+
+	qbox->module_ctx.super.free(box);
+}
+
+void quota_mailbox_allocated(struct mailbox *box)
+{
+	struct mailbox_vfuncs *v = box->vlast;
+	struct quota_mailbox *qbox;
+
+	if (QUOTA_LIST_CONTEXT(box->list) == NULL)
+		return;
+
+	if ((box->storage->class_flags & MAIL_STORAGE_CLASS_FLAG_NOQUOTA) != 0)
+		return;
+
+	qbox = p_new(box->pool, struct quota_mailbox, 1);
+	qbox->module_ctx.super = *v;
+	box->vlast = &qbox->module_ctx.super;
+
+	v->get_status = quota_get_status;
+	v->transaction_begin = quota_mailbox_transaction_begin;
+	v->transaction_commit = quota_mailbox_transaction_commit;
+	v->transaction_rollback = quota_mailbox_transaction_rollback;
+	v->save_begin = quota_save_begin;
+	v->save_finish = quota_save_finish;
+	v->copy = quota_copy;
+	v->sync_notify = quota_mailbox_sync_notify;
+	v->sync_deinit = quota_mailbox_sync_deinit;
+	v->close = quota_mailbox_close;
+	v->free = quota_mailbox_free;
+	MODULE_CONTEXT_SET(box, quota_storage_module, qbox);
+}
+
+static void quota_mailbox_list_deinit(struct mailbox_list *list)
+{
+	struct quota_mailbox_list *qlist = QUOTA_LIST_CONTEXT(list);
+
+	i_assert(qlist != NULL);
+	quota_remove_user_namespace(list->ns);
+	qlist->module_ctx.super.deinit(list);
+}
+
+struct quota *quota_get_mail_user_quota(struct mail_user *user)
+{
+	struct quota_user *quser = QUOTA_USER_CONTEXT(user);
+
+	return quser == NULL ? NULL : quser->quota;
+}
+
+static void quota_user_deinit(struct mail_user *user)
+{
+	struct quota_user *quser = QUOTA_USER_CONTEXT_REQUIRE(user);
+	struct quota_settings *quota_set = quser->quota->set;
+
+	quota_deinit(&quser->quota);
+	quser->module_ctx.super.deinit(user);
+
+	quota_settings_deinit(&quota_set);
+}
+
+void quota_mail_user_created(struct mail_user *user)
+{
+	struct mail_user_vfuncs *v = user->vlast;
+	struct quota_user *quser;
+	struct quota_settings *set;
+	struct quota *quota;
+	const char *error;
+	int ret;
+
+	if ((ret = quota_user_read_settings(user, &set, &error)) > 0) {
+		if (quota_init(set, user, &quota, &error) < 0) {
+			quota_settings_deinit(&set);
+			ret = -1;
+		}
+	}
+
+	if (ret < 0) {
+		user->error = p_strdup_printf(user->pool,
+			"Failed to initialize quota: %s", error);
+		return;
+	}
+	if (ret > 0) {
+		quser = p_new(user->pool, struct quota_user, 1);
+		quser->module_ctx.super = *v;
+		user->vlast = &quser->module_ctx.super;
+		v->deinit = quota_user_deinit;
+		quser->quota = quota;
+
+		MODULE_CONTEXT_SET(user, quota_user_module, quser);
+	} else {
+		e_debug(user->event, "quota: No quota setting - plugin disabled");
+	}
+}
+
+static struct quota_root *
+quota_find_root_for_ns(struct quota *quota, struct mail_namespace *ns)
+{
+	struct quota_root *const *roots;
+	unsigned int i, count;
+
+	roots = array_get(&quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		if (roots[i]->ns_prefix != NULL &&
+		    strcmp(roots[i]->ns_prefix, ns->prefix) == 0)
+			return roots[i];
+	}
+	return NULL;
+}
+
+void quota_mailbox_list_created(struct mailbox_list *list)
+{
+	struct quota_mailbox_list *qlist;
+	struct quota *quota = NULL;
+	struct quota_root *root;
+	struct mail_user *quota_user;
+	bool add;
+
+	/* see if we have a quota explicitly defined for this namespace */
+	quota = quota_get_mail_user_quota(list->ns->user);
+	if (quota == NULL)
+		return;
+	root = quota_find_root_for_ns(quota, list->ns);
+	if (root != NULL) {
+		/* explicit quota root */
+		root->ns = list->ns;
+		quota_user = list->ns->user;
+	} else {
+		quota_user = list->ns->owner != NULL ?
+			list->ns->owner : list->ns->user;
+	}
+
+	if ((list->ns->flags & NAMESPACE_FLAG_NOQUOTA) != 0)
+		add = FALSE;
+	else if (list->ns->owner == NULL) {
+		/* public namespace - add quota only if namespace is
+		   explicitly defined for it */
+		add = root != NULL;
+	} else {
+		/* for shared namespaces add only if the owner has quota
+		   enabled */
+		add = QUOTA_USER_CONTEXT(quota_user) != NULL;
+	}
+
+	if (add) {
+		struct mailbox_list_vfuncs *v = list->vlast;
+
+		qlist = p_new(list->pool, struct quota_mailbox_list, 1);
+		qlist->module_ctx.super = *v;
+		list->vlast = &qlist->module_ctx.super;
+		v->deinit = quota_mailbox_list_deinit;
+		MODULE_CONTEXT_SET(list, quota_mailbox_list_module, qlist);
+
+		quota = quota_get_mail_user_quota(quota_user);
+		i_assert(quota != NULL);
+		quota_add_user_namespace(quota, list->ns);
+	}
+}
+
+static void quota_root_set_namespace(struct quota_root *root,
+				     struct mail_namespace *namespaces)
+{
+	const struct quota_rule *rule;
+	const char *name;
+	struct mail_namespace *ns;
+	/* silence errors for autocreated (shared) users */
+	bool silent_errors = namespaces->user->autocreated;
+
+	if (root->ns_prefix != NULL && root->ns == NULL) {
+		root->ns = mail_namespace_find_prefix(namespaces,
+						      root->ns_prefix);
+		if (root->ns == NULL && !silent_errors) {
+			e_error(root->quota->event,
+				"Unknown namespace: %s",
+				root->ns_prefix);
+		}
+	}
+
+	array_foreach(&root->set->rules, rule) {
+		name = rule->mailbox_mask;
+		ns = mail_namespace_find(namespaces, name);
+		if ((ns->flags & NAMESPACE_FLAG_UNUSABLE) != 0 &&
+		    !silent_errors)
+			e_error(root->quota->event,
+				"Unknown namespace: %s", name);
+	}
+}
+
+void quota_mail_namespaces_created(struct mail_namespace *namespaces)
+{
+	struct quota *quota;
+	struct quota_root *const *roots;
+	unsigned int i, count;
+
+	quota = quota_get_mail_user_quota(namespaces->user);
+	if (quota == NULL)
+		return;
+	roots = array_get(&quota->roots, &count);
+	for (i = 0; i < count; i++)
+		quota_root_set_namespace(roots[i], namespaces);
+
+	quota_over_flag_check_startup(quota);
+}
diff --git a/src/plugins/quota/quota-util.c b/src/plugins/quota/quota-util.c
new file mode 100644
index 0000000..95ce369
--- /dev/null
+++ b/src/plugins/quota/quota-util.c
@@ -0,0 +1,465 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "wildcard-match.h"
+#include "quota-private.h"
+
+#include <ctype.h>
+
+#define QUOTA_DEFAULT_GRACE "10%"
+
+#define RULE_NAME_DEFAULT_FORCE "*"
+#define RULE_NAME_DEFAULT_NONFORCE "?"
+
+struct quota_rule *
+quota_root_rule_find(struct quota_root_settings *root_set, const char *name)
+{
+	struct quota_rule *rule;
+
+	array_foreach_modifiable(&root_set->rules, rule) {
+		if (wildcard_match(name, rule->mailbox_mask))
+			return rule;
+	}
+	return NULL;
+}
+
+static struct quota_rule *
+quota_root_rule_find_exact(struct quota_root_settings *root_set,
+			   const char *name)
+{
+	struct quota_rule *rule;
+
+	array_foreach_modifiable(&root_set->rules, rule) {
+		if (strcmp(rule->mailbox_mask, name) == 0)
+			return rule;
+	}
+	return NULL;
+}
+
+static int
+quota_rule_parse_percentage(struct quota_root_settings *root_set,
+			    struct quota_rule *rule,
+			    int64_t *limit, const char **error_r)
+{
+	int64_t percentage = *limit;
+
+	if (percentage <= -100 || percentage >= UINT_MAX) {
+		*error_r = "Invalid percentage";
+		return -1;
+	}
+
+	if (rule == &root_set->default_rule) {
+		*error_r = "Default rule can't be a percentage";
+		return -1;
+	}
+
+	if (limit == &rule->bytes_limit)
+		rule->bytes_percent = percentage;
+	else if (limit == &rule->count_limit)
+		rule->count_percent = percentage;
+	else
+		i_unreached();
+	return 0;
+}
+
+static int quota_limit_parse(struct quota_root_settings *root_set,
+			     struct quota_rule *rule, const char *unit,
+			     uint64_t multiply, int64_t *limit,
+			     const char **error_r)
+{
+	switch (i_toupper(*unit)) {
+	case '\0':
+		/* default */
+		break;
+	case 'B':
+		multiply = 1;
+		break;
+	case 'K':
+		multiply = 1024;
+		break;
+	case 'M':
+		multiply = 1024*1024;
+		break;
+	case 'G':
+		multiply = 1024*1024*1024;
+		break;
+	case 'T':
+		multiply = 1024ULL*1024*1024*1024;
+		break;
+	case '%':
+		multiply = 0;
+		if (quota_rule_parse_percentage(root_set, rule, limit,
+						error_r) < 0)
+			return -1;
+		break;
+	default:
+		*error_r = t_strdup_printf("Unknown unit: %s", unit);
+		return -1;
+	}
+	*limit *= multiply;
+	return 0;
+}
+
+static void
+quota_rule_recalculate_relative_rules(struct quota_rule *rule,
+				      int64_t bytes_limit, int64_t count_limit)
+{
+	if (rule->bytes_percent != 0)
+		rule->bytes_limit = bytes_limit * rule->bytes_percent / 100;
+	if (rule->count_percent != 0)
+		rule->count_limit = count_limit * rule->count_percent / 100;
+}
+
+void quota_root_recalculate_relative_rules(struct quota_root_settings *root_set,
+					   int64_t bytes_limit,
+					   int64_t count_limit)
+{
+	struct quota_rule *rule;
+	struct quota_warning_rule *warning_rule;
+
+	array_foreach_modifiable(&root_set->rules, rule) {
+		quota_rule_recalculate_relative_rules(rule, bytes_limit,
+						      count_limit);
+	}
+
+	array_foreach_modifiable(&root_set->warning_rules, warning_rule) {
+		quota_rule_recalculate_relative_rules(&warning_rule->rule,
+						      bytes_limit, count_limit);
+	}
+	quota_rule_recalculate_relative_rules(&root_set->grace_rule,
+					      bytes_limit, 0);
+	root_set->last_mail_max_extra_bytes = root_set->grace_rule.bytes_limit;
+
+	if (root_set->set->initialized) {
+		e_debug(root_set->set->event,
+			"Quota root %s: Recalculated relative rules with "
+			"bytes=%lld count=%lld. Now grace=%"PRIu64, root_set->name,
+			(long long)bytes_limit, (long long)count_limit,
+			root_set->last_mail_max_extra_bytes);
+	}
+}
+
+static int
+quota_rule_parse_limits(struct quota_root_settings *root_set,
+			struct quota_rule *rule, const char *limits,
+			const char *full_rule_def,
+			bool relative_rule, const char **error_r)
+{
+	const char **args, *key, *value, *error, *p;
+	uint64_t multiply;
+	int64_t *limit;
+
+	args = t_strsplit(limits, ":");
+	for (; *args != NULL; args++) {
+		multiply = 1;
+		limit = NULL;
+
+		key = *args;
+		value = strchr(key, '=');
+		if (value == NULL)
+			value = "";
+		else
+			key = t_strdup_until(key, value++);
+
+		if (*value == '+') {
+			if (!relative_rule) {
+				*error_r = "Rule limit cannot have '+'";
+				return -1;
+			}
+			value++;
+		} else if (*value != '-' && relative_rule) {
+			e_warning(root_set->set->event, "quota root %s rule %s: "
+				  "obsolete configuration for rule '%s' "
+				  "should be changed to '%s=+%s'",
+				  root_set->name, full_rule_def,
+				  *args, key, value);
+		}
+
+		if (strcmp(key, "storage") == 0) {
+			multiply = 1024;
+			limit = &rule->bytes_limit;
+			if (str_parse_int64(value, limit, &p) < 0) {
+				*error_r = p_strdup_printf(root_set->set->pool,
+						"Invalid storage limit: %s", value);
+				return -1;
+			}
+		} else if (strcmp(key, "bytes") == 0) {
+			limit = &rule->bytes_limit;
+			if (str_parse_int64(value, limit, &p) < 0) {
+				*error_r = p_strdup_printf(root_set->set->pool,
+						"Invalid bytes limit: %s", value);
+				return -1;
+			}
+		} else if (strcmp(key, "messages") == 0) {
+			limit = &rule->count_limit;
+			if (str_parse_int64(value, limit, &p) < 0) {
+				*error_r = p_strdup_printf(root_set->set->pool,
+						"Invalid bytes messages: %s", value);
+				return -1;
+			}
+		} else {
+			*error_r = p_strdup_printf(root_set->set->pool,
+					"Unknown rule limit name: %s", key);
+			return -1;
+		}
+
+		if (quota_limit_parse(root_set, rule, p, multiply,
+				      limit, &error) < 0) {
+			*error_r = p_strdup_printf(root_set->set->pool,
+				"Invalid rule limit value '%s': %s",
+				*args, error);
+			return -1;
+		}
+	}
+	if (!relative_rule) {
+		if (rule->bytes_limit < 0) {
+			*error_r = "Bytes limit can't be negative";
+			return -1;
+		}
+		if (rule->count_limit < 0) {
+			*error_r = "Count limit can't be negative";
+			return -1;
+		}
+	}
+	return 0;
+}
+
+int quota_root_add_rule(struct quota_root_settings *root_set,
+			const char *rule_def, const char **error_r)
+{
+	struct quota_rule *rule;
+	const char *p, *mailbox_mask;
+	int ret = 0;
+
+	p = strchr(rule_def, ':');
+	if (p == NULL) {
+		*error_r = "Invalid rule";
+		return -1;
+	}
+
+	/* <mailbox mask>:<quota limits> */
+	mailbox_mask = t_strdup_until(rule_def, p++);
+
+	rule = quota_root_rule_find_exact(root_set, mailbox_mask);
+	if (rule == NULL) {
+		if (strcmp(mailbox_mask, RULE_NAME_DEFAULT_NONFORCE) == 0)
+			rule = &root_set->default_rule;
+		else if (strcmp(mailbox_mask, RULE_NAME_DEFAULT_FORCE) == 0) {
+			rule = &root_set->default_rule;
+			root_set->force_default_rule = TRUE;
+		} else {
+			rule = array_append_space(&root_set->rules);
+			rule->mailbox_mask = strcasecmp(mailbox_mask, "INBOX") == 0 ? "INBOX" :
+				p_strdup(root_set->set->pool, mailbox_mask);
+		}
+	}
+
+	if (strcmp(p, "ignore") == 0) {
+		rule->ignore = TRUE;
+		e_debug(root_set->set->event,
+			"Quota rule: root=%s mailbox=%s ignored",
+			root_set->name, mailbox_mask);
+		return 0;
+	}
+
+	if (str_begins(p, "backend=")) {
+		if (root_set->backend->v.parse_rule == NULL) {
+			*error_r = "backend rule not supported";
+			ret = -1;
+		} else if (!root_set->backend->v.parse_rule(root_set, rule,
+							    p + 8, error_r))
+			ret = -1;
+	} else {
+		bool relative_rule = rule != &root_set->default_rule;
+
+		if (quota_rule_parse_limits(root_set, rule, p, rule_def,
+					    relative_rule, error_r) < 0)
+			ret = -1;
+	}
+
+	quota_root_recalculate_relative_rules(root_set,
+					      root_set->default_rule.bytes_limit,
+					      root_set->default_rule.count_limit);
+	const char *rule_plus =
+		rule == &root_set->default_rule ? "" : "+";
+
+	e_debug(root_set->set->event, "Quota rule: root=%s mailbox=%s "
+		"bytes=%s%lld%s messages=%s%lld%s",
+		root_set->name, mailbox_mask,
+		rule->bytes_limit > 0 ? rule_plus : "",
+		(long long)rule->bytes_limit,
+		rule->bytes_percent == 0 ? "" :
+		t_strdup_printf(" (%u%%)", rule->bytes_percent),
+		rule->count_limit > 0 ? rule_plus : "",
+		(long long)rule->count_limit,
+		rule->count_percent == 0 ? "" :
+		t_strdup_printf(" (%u%%)", rule->count_percent));
+	return ret;
+}
+
+int quota_root_add_warning_rule(struct quota_root_settings *root_set,
+				const char *rule_def, const char **error_r)
+{
+	struct quota_warning_rule *warning;
+	struct quota_rule rule;
+	const char *p, *q;
+	int ret;
+	bool reverse = FALSE;
+
+	p = strchr(rule_def, ' ');
+	if (p == NULL || p[1] == '\0') {
+		*error_r = "No command specified";
+		return -1;
+	}
+
+	if (*rule_def == '+') {
+		/* warn when exceeding quota */
+		q = rule_def+1;
+	} else if (*rule_def == '-') {
+		/* warn when going below quota */
+		q = rule_def+1;
+		reverse = TRUE;
+	} else {
+		/* default: same as '+' */
+		q = rule_def;
+	}
+
+	i_zero(&rule);
+	ret = quota_rule_parse_limits(root_set, &rule, t_strdup_until(q, p),
+				      rule_def, FALSE, error_r);
+	if (ret < 0)
+		return -1;
+
+	warning = array_append_space(&root_set->warning_rules);
+	warning->command = p_strdup(root_set->set->pool, p+1);
+	warning->rule = rule;
+	warning->reverse = reverse;
+	if (reverse)
+		root_set->have_reverse_warnings = TRUE;
+
+	quota_root_recalculate_relative_rules(root_set,
+					      root_set->default_rule.bytes_limit,
+					      root_set->default_rule.count_limit);
+	e_debug(root_set->set->event, "Quota warning: bytes=%"PRId64"%s "
+		"messages=%"PRId64"%s reverse=%s command=%s",
+		warning->rule.bytes_limit,
+		warning->rule.bytes_percent == 0 ? "" :
+		t_strdup_printf(" (%u%%)", warning->rule.bytes_percent),
+		warning->rule.count_limit,
+		warning->rule.count_percent == 0 ? "" :
+		t_strdup_printf(" (%u%%)", warning->rule.count_percent),
+		warning->reverse ? "yes" : "no",
+		warning->command);
+	return 0;
+}
+
+int quota_root_parse_grace(struct quota_root_settings *root_set,
+			   const char *value, const char **error_r)
+{
+	const char *p;
+
+	if (value == NULL) {
+		/* default */
+		value = QUOTA_DEFAULT_GRACE;
+	}
+
+	if (str_parse_int64(value, &root_set->grace_rule.bytes_limit, &p) < 0)
+		return -1;
+	if (quota_limit_parse(root_set, &root_set->grace_rule, p, 1,
+			      &root_set->grace_rule.bytes_limit, error_r) < 0)
+		return -1;
+	quota_rule_recalculate_relative_rules(&root_set->grace_rule,
+		root_set->default_rule.bytes_limit, 0);
+	root_set->last_mail_max_extra_bytes = root_set->grace_rule.bytes_limit;
+	e_debug(root_set->set->event, "Quota grace: root=%s bytes=%lld%s",
+		root_set->name, (long long)root_set->grace_rule.bytes_limit,
+		root_set->grace_rule.bytes_percent == 0 ? "" :
+		t_strdup_printf(" (%u%%)", root_set->grace_rule.bytes_percent));
+	return 0;
+}
+
+bool quota_warning_match(const struct quota_warning_rule *w,
+			 uint64_t bytes_before, uint64_t bytes_current,
+			 uint64_t count_before, uint64_t count_current,
+			 const char **reason_r)
+{
+#define QUOTA_EXCEEDED(before, current, limit) \
+	((before) < (uint64_t)(limit) && (current) >= (uint64_t)(limit))
+	if (!w->reverse) {
+		/* over quota (default) */
+		if (QUOTA_EXCEEDED(bytes_before, bytes_current, w->rule.bytes_limit)) {
+			*reason_r = t_strdup_printf("bytes=%"PRIu64" -> %"PRIu64" over limit %"PRId64,
+				bytes_before, bytes_current, w->rule.bytes_limit);
+			return TRUE;
+		}
+		if (QUOTA_EXCEEDED(count_before, count_current, w->rule.count_limit)) {
+			*reason_r = t_strdup_printf("count=%"PRIu64" -> %"PRIu64" over limit %"PRId64,
+				count_before, count_current, w->rule.count_limit);
+			return TRUE;
+		}
+	} else {
+		if (QUOTA_EXCEEDED(bytes_current, bytes_before, w->rule.bytes_limit)) {
+			*reason_r = t_strdup_printf("bytes=%"PRIu64" -> %"PRIu64" below limit %"PRId64,
+				bytes_before, bytes_current, w->rule.bytes_limit);
+			return TRUE;
+		}
+		if (QUOTA_EXCEEDED(count_current, count_before, w->rule.count_limit)) {
+			*reason_r = t_strdup_printf("count=%"PRIu64" -> %"PRIu64" below limit %"PRId64,
+				count_before, count_current, w->rule.count_limit);
+			return TRUE;
+		}
+	}
+	return FALSE;
+}
+
+bool quota_transaction_is_over(struct quota_transaction_context *ctx,
+			       uoff_t size)
+{
+	if (ctx->count_used < 0) {
+		/* we've deleted some messages. we should be ok, unless we
+		   were already over quota and still are after these
+		   deletions. */
+		const uint64_t count_deleted = (uint64_t)-ctx->count_used;
+
+		if (ctx->count_over > 0) {
+			if (count_deleted - 1 < ctx->count_over)
+				return TRUE;
+		}
+	} else {
+		if (ctx->count_ceil < 1 ||
+		    ctx->count_ceil - 1 < (uint64_t)ctx->count_used) {
+			/* count limit reached */
+			return TRUE;
+		}
+	}
+
+	if (ctx->bytes_used < 0) {
+		const uint64_t bytes_deleted = (uint64_t)-ctx->bytes_used;
+
+		/* we've deleted some messages. same logic as above. */
+		if (ctx->bytes_over > 0) {
+			if (ctx->bytes_over > bytes_deleted) {
+				/* even after deletions we're over quota */
+				return TRUE;
+			}
+			if (size > bytes_deleted - ctx->bytes_over)
+				return TRUE;
+		} else {
+			if (size > bytes_deleted &&
+			    size - bytes_deleted < ctx->bytes_ceil)
+				return TRUE;
+		}
+	} else if (size == 0) {
+		/* we need to explicitly test this case, since the generic
+		   check would fail if user is already over quota */
+		if (ctx->bytes_over > 0)
+			return TRUE;
+	} else {
+		if (ctx->bytes_ceil < size ||
+		    ctx->bytes_ceil - size < (uint64_t)ctx->bytes_used) {
+			/* bytes limit reached */
+			return TRUE;
+		}
+	}
+	return FALSE;
+}
diff --git a/src/plugins/quota/quota.c b/src/plugins/quota/quota.c
new file mode 100644
index 0000000..3d6d8e5
--- /dev/null
+++ b/src/plugins/quota/quota.c
@@ -0,0 +1,1543 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "hash.h"
+#include "str.h"
+#include "ioloop.h"
+#include "net.h"
+#include "write-full.h"
+#include "eacces-error.h"
+#include "wildcard-match.h"
+#include "dict.h"
+#include "mailbox-list-private.h"
+#include "quota-private.h"
+#include "quota-fs.h"
+#include "llist.h"
+#include "program-client.h"
+#include "settings-parser.h"
+
+#include <sys/wait.h>
+
+#define DEFAULT_QUOTA_EXCEEDED_MSG \
+	"Quota exceeded (mailbox for user is full)"
+#define QUOTA_LIMIT_SET_PATH DICT_PATH_PRIVATE"quota/limit/"
+
+/* How many seconds after the userdb lookup do we still want to execute the
+   quota_over_script. This applies to quota_over_flag_lazy_check=yes and also
+   after unhibernating IMAP connections. */
+#define QUOTA_OVER_FLAG_MAX_DELAY_SECS 10
+
+struct quota_root_iter {
+	struct quota *quota;
+	struct mailbox *box;
+
+	unsigned int i;
+};
+
+unsigned int quota_module_id = 0;
+
+extern struct quota_backend quota_backend_count;
+extern struct quota_backend quota_backend_dict;
+extern struct quota_backend quota_backend_dirsize;
+extern struct quota_backend quota_backend_fs;
+extern struct quota_backend quota_backend_imapc;
+extern struct quota_backend quota_backend_maildir;
+
+static const struct quota_backend *quota_internal_backends[] = {
+#ifdef HAVE_FS_QUOTA
+	&quota_backend_fs,
+#endif
+	&quota_backend_count,
+	&quota_backend_dict,
+	&quota_backend_dirsize,
+	&quota_backend_imapc,
+	&quota_backend_maildir
+};
+
+static ARRAY(const struct quota_backend*) quota_backends;
+
+static void hidden_param_handler(struct quota_root *_root, const char *param_value);
+static void ignoreunlim_param_handler(struct quota_root *_root, const char *param_value);
+static void noenforcing_param_handler(struct quota_root *_root, const char *param_value);
+static void ns_param_handler(struct quota_root *_root, const char *param_value);
+
+struct quota_param_parser quota_param_hidden = {.param_name = "hidden", .param_handler = hidden_param_handler};
+struct quota_param_parser quota_param_ignoreunlimited = {.param_name = "ignoreunlimited", .param_handler = ignoreunlim_param_handler};
+struct quota_param_parser quota_param_noenforcing = {.param_name = "noenforcing", .param_handler = noenforcing_param_handler};
+struct quota_param_parser quota_param_ns = {.param_name = "ns=", .param_handler = ns_param_handler};
+
+static enum quota_alloc_result quota_default_test_alloc(
+		struct quota_transaction_context *ctx, uoff_t size,
+		const char **error_r);
+static void quota_over_flag_check_root(struct quota_root *root);
+
+static const struct quota_backend *quota_backend_find(const char *name)
+{
+	const struct quota_backend *const *backend;
+
+	array_foreach(&quota_backends, backend) {
+		if (strcmp((*backend)->name, name) == 0)
+			return *backend;
+	}
+
+	return NULL;
+}
+
+void quota_backend_register(const struct quota_backend *backend)
+{
+	i_assert(quota_backend_find(backend->name) == NULL);
+	array_push_back(&quota_backends, &backend);
+}
+
+void quota_backend_unregister(const struct quota_backend *backend)
+{
+	for(unsigned int i = 0; i < array_count(&quota_backends); i++) {
+		const struct quota_backend *be =
+			array_idx_elem(&quota_backends, i);
+		if (strcmp(be->name, backend->name) == 0) {
+			array_delete(&quota_backends, i, 1);
+			return;
+		}
+	}
+
+	i_unreached();
+}
+
+void quota_backends_register(void);
+void quota_backends_unregister(void);
+
+void quota_backends_register(void)
+{
+	i_array_init(&quota_backends, 8);
+	array_append(&quota_backends, quota_internal_backends,
+		     N_ELEMENTS(quota_internal_backends));
+}
+
+void quota_backends_unregister(void)
+{
+	for(size_t i = 0; i < N_ELEMENTS(quota_internal_backends); i++) {
+		quota_backend_unregister(quota_internal_backends[i]);
+	}
+
+	i_assert(array_count(&quota_backends) == 0);
+	array_free(&quota_backends);
+
+}
+
+static int quota_root_add_rules(struct mail_user *user, const char *root_name,
+				struct quota_root_settings *root_set,
+				const char **error_r)
+{
+	const char *rule_name, *rule, *error;
+	unsigned int i;
+
+	rule_name = t_strconcat(root_name, "_rule", NULL);
+	for (i = 2;; i++) {
+		rule = mail_user_plugin_getenv(user, rule_name);
+		if (rule == NULL)
+			break;
+
+		if (quota_root_add_rule(root_set, rule, &error) < 0) {
+			*error_r = t_strdup_printf("Invalid rule %s: %s",
+						   rule, error);
+			return -1;
+		}
+		rule_name = t_strdup_printf("%s_rule%d", root_name, i);
+	}
+	return 0;
+}
+
+static int
+quota_root_add_warning_rules(struct mail_user *user, const char *root_name,
+			     struct quota_root_settings *root_set,
+			     const char **error_r)
+{
+	const char *rule_name, *rule, *error;
+	unsigned int i;
+
+	rule_name = t_strconcat(root_name, "_warning", NULL);
+	for (i = 2;; i++) {
+		rule = mail_user_plugin_getenv(user, rule_name);
+		if (rule == NULL)
+			break;
+
+		if (quota_root_add_warning_rule(root_set, rule, &error) < 0) {
+			*error_r = t_strdup_printf("Invalid warning rule: %s",
+						   rule);
+			return -1;
+		}
+		rule_name = t_strdup_printf("%s_warning%d", root_name, i);
+	}
+	return 0;
+}
+
+static int
+quota_root_parse_set(struct mail_user *user, const char *root_name,
+		     struct quota_root_settings *root_set,
+		     const char **error_r)
+{
+	const char *name, *value;
+
+	name = t_strconcat(root_name, "_set", NULL);
+	value = mail_user_plugin_getenv(user, name);
+	if (value == NULL)
+		return 0;
+
+	if (!str_begins(value, "dict:")) {
+		*error_r = t_strdup_printf("%s supports only dict backend", name);
+		return -1;
+	}
+	root_set->limit_set = p_strdup(root_set->set->pool, value+5);
+	return 0;
+}
+
+static int
+quota_root_settings_init(struct quota_settings *quota_set, const char *root_def,
+			 struct quota_root_settings **set_r,
+			 const char **error_r)
+{
+	struct quota_root_settings *root_set;
+	const struct quota_backend *backend;
+	const char *p, *args, *backend_name;
+
+	/* <backend>[:<quota root name>[:<backend args>]] */
+	p = strchr(root_def, ':');
+	if (p == NULL) {
+		backend_name = root_def;
+		args = NULL;
+	} else {
+		backend_name = t_strdup_until(root_def, p);
+		args = p + 1;
+	}
+
+	backend = quota_backend_find(backend_name);
+	if (backend == NULL) {
+		*error_r = t_strdup_printf("Unknown quota backend: %s",
+					   backend_name);
+		return -1;
+	}
+
+	root_set = p_new(quota_set->pool, struct quota_root_settings, 1);
+	root_set->set = quota_set;
+	root_set->backend = backend;
+
+	if (args != NULL) {
+		/* save root's name */
+		p = strchr(args, ':');
+		if (p == NULL) {
+			root_set->name = p_strdup(quota_set->pool, args);
+			args = NULL;
+		} else {
+			root_set->name =
+				p_strdup_until(quota_set->pool, args, p);
+			args = p + 1;
+		}
+	} else {
+		root_set->name = "";
+	}
+	root_set->args = p_strdup(quota_set->pool, args);
+
+	e_debug(quota_set->event, "Quota root: name=%s backend=%s args=%s",
+		root_set->name, backend_name, args == NULL ? "" : args);
+
+	p_array_init(&root_set->rules, quota_set->pool, 4);
+	p_array_init(&root_set->warning_rules, quota_set->pool, 4);
+	array_push_back(&quota_set->root_sets, &root_set);
+	*set_r = root_set;
+	return 0;
+}
+
+static int
+quota_root_add(struct quota_settings *quota_set, struct mail_user *user,
+	       const char *env, const char *root_name, const char **error_r)
+{
+	struct quota_root_settings *root_set;
+	const char *set_name, *value;
+
+	if (quota_root_settings_init(quota_set, env, &root_set, error_r) < 0)
+		return -1;
+	root_set->set_name = p_strdup(quota_set->pool, root_name);
+	if (quota_root_add_rules(user, root_name, root_set, error_r) < 0)
+		return -1;
+	if (quota_root_add_warning_rules(user, root_name, root_set, error_r) < 0)
+		return -1;
+	if (quota_root_parse_set(user, root_name, root_set, error_r) < 0)
+		return -1;
+
+	set_name = t_strconcat(root_name, "_grace", NULL);
+	value = mail_user_plugin_getenv(user, set_name);
+	if (quota_root_parse_grace(root_set, value, error_r) < 0) {
+		*error_r = t_strdup_printf("Invalid %s value '%s': %s",
+					   set_name, value, *error_r);
+		return -1;
+	}
+	return 0;
+}
+
+const char *quota_alloc_result_errstr(enum quota_alloc_result res,
+		struct quota_transaction_context *qt)
+{
+	switch (res) {
+	case QUOTA_ALLOC_RESULT_OK:
+		return "OK";
+	case QUOTA_ALLOC_RESULT_BACKGROUND_CALC:
+		return "Blocked by an ongoing background quota calculation";
+	case QUOTA_ALLOC_RESULT_TEMPFAIL:
+		return "Internal quota calculation error";
+	case QUOTA_ALLOC_RESULT_OVER_MAXSIZE:
+		return "Mail size is larger than the maximum size allowed by "
+		       "server configuration";
+	case QUOTA_ALLOC_RESULT_OVER_QUOTA_LIMIT:
+	case QUOTA_ALLOC_RESULT_OVER_QUOTA:
+		return qt->quota->set->quota_exceeded_msg;
+	}
+	i_unreached();
+}
+
+int quota_user_read_settings(struct mail_user *user,
+			     struct quota_settings **set_r,
+			     const char **error_r)
+{
+	struct quota_settings *quota_set;
+	char root_name[5 + MAX_INT_STRLEN];
+	const char *env, *error;
+	unsigned int i;
+	pool_t pool;
+
+	pool = pool_alloconly_create("quota settings", 2048);
+	quota_set = p_new(pool, struct quota_settings, 1);
+	quota_set->pool = pool;
+	quota_set->event = event_create(user->event);
+	quota_set->test_alloc = quota_default_test_alloc;
+	quota_set->debug = user->mail_debug;
+	quota_set->quota_exceeded_msg =
+		mail_user_plugin_getenv(user, "quota_exceeded_message");
+	if (quota_set->quota_exceeded_msg == NULL)
+		quota_set->quota_exceeded_msg = DEFAULT_QUOTA_EXCEEDED_MSG;
+	quota_set->vsizes = mail_user_plugin_getenv_bool(user, "quota_vsizes");
+
+	const char *max_size = mail_user_plugin_getenv(user,
+						       "quota_max_mail_size");
+	if (max_size != NULL) {
+		const char *error = NULL;
+		if (settings_get_size(max_size, &quota_set->max_mail_size,
+					&error) < 0) {
+			*error_r = t_strdup_printf("quota_max_mail_size: %s",
+					error);
+			return -1;
+		}
+	}
+
+	p_array_init(&quota_set->root_sets, pool, 4);
+	if (i_strocpy(root_name, "quota", sizeof(root_name)) < 0)
+		i_unreached();
+	for (i = 2;; i++) {
+		env = mail_user_plugin_getenv(user, root_name);
+		if (env == NULL || *env == '\0')
+			break;
+
+		if (quota_root_add(quota_set, user, env, root_name,
+				   &error) < 0) {
+			*error_r = t_strdup_printf("Invalid quota root %s: %s",
+						   root_name, error);
+			event_unref(&quota_set->event);
+			pool_unref(&pool);
+			return -1;
+		}
+		if (i_snprintf(root_name, sizeof(root_name), "quota%d", i) < 0)
+			i_unreached();
+	}
+	if (quota_set->max_mail_size == 0 &&
+	    array_count(&quota_set->root_sets) == 0) {
+		event_unref(&quota_set->event);
+		pool_unref(&pool);
+		return 0;
+	}
+
+	quota_set->initialized = TRUE;
+	*set_r = quota_set;
+	return 1;
+}
+
+void quota_settings_deinit(struct quota_settings **_quota_set)
+{
+	struct quota_settings *quota_set = *_quota_set;
+
+	*_quota_set = NULL;
+
+	event_unref(&quota_set->event);
+	pool_unref(&quota_set->pool);
+}
+
+static void quota_root_deinit(struct quota_root *root)
+{
+	pool_t pool = root->pool;
+
+	if (root->limit_set_dict != NULL)
+		dict_deinit(&root->limit_set_dict);
+	event_unref(&root->backend.event);
+	root->backend.v.deinit(root);
+	pool_unref(&pool);
+}
+
+int quota_root_default_init(struct quota_root *root, const char *args,
+			    const char **error_r)
+{
+	const struct quota_param_parser default_params[] = {
+		quota_param_hidden,
+		quota_param_ignoreunlimited,
+		quota_param_noenforcing,
+		quota_param_ns,
+		{.param_name = NULL}
+	};
+	return quota_parse_parameters(root, &args, error_r, default_params, TRUE);
+}
+
+static int
+quota_root_init(struct quota_root_settings *root_set, struct quota *quota,
+		struct quota_root **root_r, const char **error_r)
+{
+	struct quota_root *root;
+
+	root = root_set->backend->v.alloc();
+	root->pool = pool_alloconly_create("quota root", 512);
+	root->set = root_set;
+	root->quota = quota;
+	root->backend = *root_set->backend;
+	root->bytes_limit = root_set->default_rule.bytes_limit;
+	root->count_limit = root_set->default_rule.count_limit;
+
+	array_create(&root->quota_module_contexts, root->pool,
+		     sizeof(void *), 10);
+
+	if (root->backend.v.init != NULL) {
+		root->backend.event = event_create(quota->event);
+		event_drop_parent_log_prefixes(root->backend.event, 1);
+		event_set_forced_debug(root->backend.event, root->quota->set->debug);
+
+		if (root->backend.v.init(root, root_set->args, error_r) < 0) {
+			*error_r = t_strdup_printf("%s quota init failed: %s",
+					root->backend.name, *error_r);
+
+			event_unref(&root->backend.event);
+			return -1;
+		}
+	} else {
+		if (quota_root_default_init(root, root_set->args, error_r) < 0)
+			return -1;
+	}
+	if (root_set->default_rule.bytes_limit == 0 &&
+	    root_set->default_rule.count_limit == 0 &&
+	    root->disable_unlimited_tracking) {
+		quota_root_deinit(root);
+		return 0;
+	}
+	*root_r = root;
+	return 1;
+}
+
+int quota_init(struct quota_settings *quota_set, struct mail_user *user,
+	       struct quota **quota_r, const char **error_r)
+{
+	struct quota *quota;
+	struct quota_root *root;
+	struct quota_root_settings *const *root_sets;
+	unsigned int i, count;
+	const char *error;
+	int ret;
+
+	quota = i_new(struct quota, 1);
+	quota->event = event_create(user->event);
+	event_set_forced_debug(quota->event, quota_set->debug);
+	event_set_append_log_prefix(quota->event, "quota: ");
+	quota->user = user;
+	quota->set = quota_set;
+	i_array_init(&quota->roots, 8);
+
+	root_sets = array_get(&quota_set->root_sets, &count);
+	i_array_init(&quota->namespaces, count);
+	for (i = 0; i < count; i++) {
+		ret = quota_root_init(root_sets[i], quota, &root, &error);
+		if (ret < 0) {
+			*error_r = t_strdup_printf("Quota root %s: %s",
+						   root_sets[i]->name, error);
+			quota_deinit(&quota);
+			return -1;
+		}
+		if (ret > 0)
+			array_push_back(&quota->roots, &root);
+	}
+	*quota_r = quota;
+	return 0;
+}
+
+void quota_deinit(struct quota **_quota)
+{
+	struct quota *quota = *_quota;
+	struct quota_root *const *roots;
+	unsigned int i, count;
+
+	roots = array_get(&quota->roots, &count);
+	for (i = 0; i < count; i++)
+		quota_root_deinit(roots[i]);
+
+	/* deinit quota roots before setting quser->quota=NULL */
+	*_quota = NULL;
+
+	array_free(&quota->roots);
+	array_free(&quota->namespaces);
+	event_unref(&quota->event);
+	i_free(quota);
+}
+
+static int quota_root_get_rule_limits(struct quota_root *root,
+				      const char *mailbox_name,
+				      uint64_t *bytes_limit_r,
+				      uint64_t *count_limit_r,
+				      bool *ignored_r,
+				      const char **error_r)
+{
+	struct quota_rule *rule;
+	int64_t bytes_limit, count_limit;
+	int ret;
+
+	*ignored_r = FALSE;
+
+	if (!root->set->force_default_rule) {
+		if (root->backend.v.init_limits != NULL) {
+			const char *error;
+			if (root->backend.v.init_limits(root, &error) < 0) {
+				*error_r = t_strdup_printf(
+					"Initializing limits failed for quota backend: %s",
+					error);
+				return -1;
+			}
+		}
+	}
+
+	bytes_limit = root->bytes_limit;
+	count_limit = root->count_limit;
+
+	/* if default rule limits are 0, user has unlimited quota.
+	   ignore any specific quota rules */
+	if (bytes_limit != 0 || count_limit != 0) {
+		(void)mail_namespace_find_unalias(root->quota->user->namespaces,
+						  &mailbox_name);
+		rule = quota_root_rule_find(root->set, mailbox_name);
+		ret = 1;
+	} else {
+		rule = NULL;
+		ret = 0;
+	}
+
+	if (rule != NULL) {
+		if (!rule->ignore) {
+			bytes_limit += rule->bytes_limit;
+			count_limit += rule->count_limit;
+		} else {
+			bytes_limit = 0;
+			count_limit = 0;
+			*ignored_r = TRUE;
+		}
+	}
+
+	*bytes_limit_r = bytes_limit <= 0 ? 0 : bytes_limit;
+	*count_limit_r = count_limit <= 0 ? 0 : count_limit;
+	return ret;
+}
+
+static bool
+quota_is_duplicate_namespace(struct quota *quota, struct mail_namespace *ns)
+{
+	struct mail_namespace *const *namespaces;
+	unsigned int i, count;
+	const char *path, *path2;
+
+	if (!mailbox_list_get_root_path(ns->list,
+					MAILBOX_LIST_PATH_TYPE_MAILBOX, &path))
+		path = NULL;
+
+	namespaces = array_get(&quota->namespaces, &count);
+	for (i = 0; i < count; i++) {
+		/* count namespace aliases only once. don't rely only on
+		   alias_for != NULL, because the alias might have been
+		   explicitly added as the wanted quota namespace. */
+		if (ns->alias_for == namespaces[i] ||
+		    namespaces[i]->alias_for == ns)
+			continue;
+
+		if (path != NULL &&
+		    mailbox_list_get_root_path(namespaces[i]->list,
+				MAILBOX_LIST_PATH_TYPE_MAILBOX, &path2) &&
+		    strcmp(path, path2) == 0) {
+			/* duplicate path */
+			if ((ns->flags & NAMESPACE_FLAG_INBOX_USER) == 0)
+				return TRUE;
+
+			/* this is inbox=yes namespace, but the earlier one
+			   that had the same location was inbox=no. we need to
+			   include the INBOX also in quota calculations, so we
+			   can't just ignore this namespace. but since we've
+			   already called backend's namespace_added(), we can't
+			   just remove it either. so just mark the old one as
+			   unwanted namespace.
+
+			   an alternative would be to do a bit larger change so
+			   namespaces wouldn't be added until
+			   mail_namespaces_created() hook is called */
+			i_assert(quota->unwanted_ns == NULL);
+			quota->unwanted_ns = namespaces[i];
+			return FALSE;
+		}
+	}
+	return FALSE;
+}
+
+void quota_add_user_namespace(struct quota *quota, struct mail_namespace *ns)
+{
+	struct quota_root *const *roots;
+	struct quota_backend **backends;
+	unsigned int i, j, count;
+
+	/* first check if there already exists a namespace with the exact same
+	   path. we don't want to count them twice. */
+	if (quota_is_duplicate_namespace(quota, ns))
+		return;
+
+	array_push_back(&quota->namespaces, &ns);
+
+	roots = array_get(&quota->roots, &count);
+	/* @UNSAFE: get different backends into one array */
+	backends = t_new(struct quota_backend *, count + 1);
+	for (i = 0; i < count; i++) {
+		for (j = 0; backends[j] != NULL; j++) {
+			if (backends[j]->name == roots[i]->backend.name)
+				break;
+		}
+		if (backends[j] == NULL)
+			backends[j] = &roots[i]->backend;
+	}
+
+	for (i = 0; backends[i] != NULL; i++) {
+		if (backends[i]->v.namespace_added != NULL)
+			backends[i]->v.namespace_added(quota, ns);
+	}
+}
+
+void quota_remove_user_namespace(struct mail_namespace *ns)
+{
+	struct quota *quota;
+	struct mail_namespace *const *namespaces;
+	unsigned int i, count;
+
+	quota = ns->owner != NULL ?
+		quota_get_mail_user_quota(ns->owner) :
+		quota_get_mail_user_quota(ns->user);
+	if (quota == NULL) {
+		/* no quota for this namespace */
+		return;
+	}
+
+	namespaces = array_get(&quota->namespaces, &count);
+	for (i = 0; i < count; i++) {
+		if (namespaces[i] == ns) {
+			array_delete(&quota->namespaces, i, 1);
+			break;
+		}
+	}
+}
+
+struct quota_root_iter *
+quota_root_iter_init_user(struct mail_user *user)
+{
+	struct quota_root_iter *iter;
+
+	iter = i_new(struct quota_root_iter, 1);
+	iter->quota = quota_get_mail_user_quota(user);
+	return iter;
+}
+
+struct quota_root_iter *
+quota_root_iter_init(struct mailbox *box)
+{
+	struct quota_root_iter *iter;
+	struct mail_user *user;
+
+	user = box->list->ns->owner != NULL ?
+		box->list->ns->owner : box->list->ns->user;
+	iter = quota_root_iter_init_user(user);
+	iter->box = box;
+	return iter;
+}
+
+bool quota_root_is_namespace_visible(struct quota_root *root,
+				     struct mail_namespace *ns)
+{
+	struct mailbox_list *list = ns->list;
+	struct mail_storage *storage;
+
+	/* this check works as long as there is only one storage per list */
+	if (mailbox_list_get_storage(&list, "", &storage) == 0 &&
+	    (storage->class_flags & MAIL_STORAGE_CLASS_FLAG_NOQUOTA) != 0)
+		return FALSE;
+	if (root->quota->unwanted_ns == ns)
+		return FALSE;
+
+	if (root->ns_prefix != NULL) {
+		if (root->ns != ns)
+			return FALSE;
+	} else {
+		if (ns->owner == NULL)
+			return FALSE;
+	}
+	return TRUE;
+}
+
+static bool
+quota_root_is_visible(struct quota_root *root, struct mailbox *box)
+{
+	if (!quota_root_is_namespace_visible(root, box->list->ns))
+		return FALSE;
+	if (array_count(&root->quota->roots) == 1) {
+		/* a single quota root: don't bother checking further */
+		return TRUE;
+	}
+	return root->backend.v.match_box == NULL ? TRUE :
+		root->backend.v.match_box(root, box);
+}
+
+struct quota_root *quota_root_iter_next(struct quota_root_iter *iter)
+{
+	struct quota_root *const *roots, *root = NULL;
+	unsigned int count;
+
+	if (iter->quota == NULL)
+		return NULL;
+
+	roots = array_get(&iter->quota->roots, &count);
+	if (iter->i >= count)
+		return NULL;
+
+	for (; iter->i < count; iter->i++) {
+		if (iter->box != NULL &&
+		    !quota_root_is_visible(roots[iter->i], iter->box))
+			continue;
+
+		root = roots[iter->i];
+		break;
+	}
+
+	iter->i++;
+	return root;
+}
+
+void quota_root_iter_deinit(struct quota_root_iter **_iter)
+{
+	struct quota_root_iter *iter = *_iter;
+
+	*_iter = NULL;
+	i_free(iter);
+}
+
+struct quota_root *quota_root_lookup(struct mail_user *user, const char *name)
+{
+	struct quota *quota;
+	struct quota_root *const *roots;
+	unsigned int i, count;
+
+	quota = quota_get_mail_user_quota(user);
+	if (quota == NULL)
+		return NULL;
+	roots = array_get(&quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		if (strcmp(roots[i]->set->name, name) == 0)
+			return roots[i];
+	}
+	return NULL;
+}
+
+const char *quota_root_get_name(struct quota_root *root)
+{
+	return root->set->name;
+}
+
+const char *const *quota_root_get_resources(struct quota_root *root)
+{
+	/* if we haven't checked the quota_over_flag yet, do it now */
+	quota_over_flag_check_root(root);
+
+	return root->backend.v.get_resources(root);
+}
+
+bool quota_root_is_hidden(struct quota_root *root)
+{
+	return root->hidden;
+}
+
+enum quota_get_result
+quota_get_resource(struct quota_root *root, const char *mailbox_name,
+		   const char *name, uint64_t *value_r, uint64_t *limit_r,
+		   const char **error_r)
+{
+	const char *error;
+	uint64_t bytes_limit, count_limit;
+	bool ignored, kilobytes = FALSE;
+	enum quota_get_result ret;
+
+	*value_r = *limit_r = 0;
+
+	if (strcmp(name, QUOTA_NAME_STORAGE_KILOBYTES) == 0) {
+		name = QUOTA_NAME_STORAGE_BYTES;
+		kilobytes = TRUE;
+	}
+
+	/* Get the value first. This call may also update quota limits if
+	   they're defined externally. */
+	ret = root->backend.v.get_resource(root, name, value_r, &error);
+	if (ret == QUOTA_GET_RESULT_UNLIMITED)
+		i_panic("Quota backend %s returned QUOTA_GET_RESULT_UNLIMITED "
+			"while getting resource %s from box %s",
+			root->backend.name, name, mailbox_name);
+	else if (ret != QUOTA_GET_RESULT_LIMITED) {
+		*error_r = t_strdup_printf(
+			"quota-%s: %s", root->set->backend->name, error);
+		return ret;
+	}
+
+	if (quota_root_get_rule_limits(root, mailbox_name,
+				       &bytes_limit, &count_limit,
+				       &ignored, &error) < 0) {
+		*error_r = t_strdup_printf(
+			"Failed to get quota root rule limits for mailbox %s: %s",
+			mailbox_name, error);
+		return QUOTA_GET_RESULT_INTERNAL_ERROR;
+	}
+
+	if (strcmp(name, QUOTA_NAME_STORAGE_BYTES) == 0)
+		*limit_r = bytes_limit;
+	else if (strcmp(name, QUOTA_NAME_MESSAGES) == 0)
+		*limit_r = count_limit;
+	else
+		*limit_r = 0;
+
+	if (kilobytes) {
+		*value_r = (*value_r + 1023) / 1024;
+		*limit_r = (*limit_r + 1023) / 1024;
+	}
+	return *limit_r == 0 ? QUOTA_GET_RESULT_UNLIMITED : QUOTA_GET_RESULT_LIMITED;
+}
+
+int quota_set_resource(struct quota_root *root, const char *name,
+		       uint64_t value, const char **client_error_r)
+{
+	struct dict_transaction_context *trans;
+	const char *key, *error;
+	const struct dict_op_settings *set;
+
+	if (root->set->limit_set == NULL) {
+		*client_error_r = MAIL_ERRSTR_NO_PERMISSION;
+		return -1;
+	}
+	if (strcasecmp(name, QUOTA_NAME_STORAGE_KILOBYTES) == 0)
+		key = "storage";
+	else if (strcasecmp(name, QUOTA_NAME_STORAGE_BYTES) == 0)
+		key = "bytes";
+	else if (strcasecmp(name, QUOTA_NAME_MESSAGES) == 0)
+		key = "messages";
+	else {
+		*client_error_r = t_strdup_printf(
+			"Unsupported resource name: %s", name);
+		return -1;
+	}
+
+	if (root->limit_set_dict == NULL) {
+		struct dict_settings set;
+
+		i_zero(&set);
+		set.base_dir = root->quota->user->set->base_dir;
+		set.event_parent = root->quota->user->event;
+		if (dict_init(root->set->limit_set, &set,
+			      &root->limit_set_dict, &error) < 0) {
+			e_error(root->quota->event,
+				"dict_init() failed: %s", error);
+			*client_error_r = "Internal quota limit update error";
+			return -1;
+		}
+	}
+
+	set = mail_user_get_dict_op_settings(root->ns->user);
+	trans = dict_transaction_begin(root->limit_set_dict, set);
+	key = t_strdup_printf(QUOTA_LIMIT_SET_PATH"%s", key);
+	dict_set(trans, key, dec2str(value));
+	if (dict_transaction_commit(&trans, &error) < 0) {
+		e_error(root->quota->event,
+			"dict_transaction_commit() failed: %s", error);
+		*client_error_r = "Internal quota limit update error";
+		return -1;
+	}
+	return 0;
+}
+
+struct quota_transaction_context *quota_transaction_begin(struct mailbox *box)
+{
+	struct quota_transaction_context *ctx;
+	struct quota_root *const *rootp;
+	const struct quota_rule *rule;
+	const char *mailbox_name;
+
+	ctx = i_new(struct quota_transaction_context, 1);
+	ctx->quota = box->list->ns->owner != NULL ?
+		quota_get_mail_user_quota(box->list->ns->owner) :
+		quota_get_mail_user_quota(box->list->ns->user);
+	i_assert(ctx->quota != NULL);
+
+	ctx->box = box;
+	ctx->bytes_ceil = (uint64_t)-1;
+	ctx->bytes_ceil2 = (uint64_t)-1;
+	ctx->count_ceil = (uint64_t)-1;
+
+	mailbox_name = mailbox_get_vname(box);
+	(void)mail_namespace_find_unalias(box->storage->user->namespaces,
+					  &mailbox_name);
+
+	ctx->auto_updating = TRUE;
+	array_foreach(&ctx->quota->roots, rootp) {
+		if (!quota_root_is_visible(*rootp, ctx->box))
+			continue;
+
+		rule = quota_root_rule_find((*rootp)->set, mailbox_name);
+		if (rule != NULL && rule->ignore) {
+			/* This mailbox isn't included in quota. This means
+			   it's also not included in quota_warnings, so make
+			   sure it's fully ignored. */
+			continue;
+		}
+
+		/* If there are reverse quota_warnings, we'll need to track
+		   how many bytes were expunged even with auto_updating roots.
+		   (An alternative could be to get the current quota usage
+		   before and after the expunges, but that's more complicated
+		   and probably isn't any better.) */
+		if (!(*rootp)->auto_updating ||
+		    (*rootp)->set->have_reverse_warnings)
+			ctx->auto_updating = FALSE;
+	}
+
+	if (box->storage->user->dsyncing) {
+		/* ignore quota for dsync */
+		ctx->limits_set = TRUE;
+	}
+	return ctx;
+}
+
+int quota_transaction_set_limits(struct quota_transaction_context *ctx,
+				 enum quota_get_result *error_result_r,
+				 const char **error_r)
+{
+	struct quota_root *const *roots;
+	const char *mailbox_name, *error;
+	unsigned int i, count;
+	uint64_t bytes_limit, count_limit, current, limit, diff;
+	bool use_grace, ignored;
+	enum quota_get_result ret;
+
+	if (ctx->limits_set)
+		return 0;
+	ctx->limits_set = TRUE;
+	mailbox_name = mailbox_get_vname(ctx->box);
+	/* use quota_grace only for LDA/LMTP */
+	use_grace = (ctx->box->flags & MAILBOX_FLAG_POST_SESSION) != 0;
+	ctx->no_quota_updates = TRUE;
+
+	/* find the lowest quota limits from all roots and use them */
+	roots = array_get(&ctx->quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		/* make sure variables get initialized */
+		bytes_limit = count_limit = 0;
+		if (!quota_root_is_visible(roots[i], ctx->box))
+			continue;
+		else if (roots[i]->no_enforcing) {
+			ignored = FALSE;
+		} else if (quota_root_get_rule_limits(roots[i], mailbox_name,
+						      &bytes_limit, &count_limit,
+						      &ignored, &error) < 0) {
+			ctx->failed = TRUE;
+			*error_result_r = QUOTA_GET_RESULT_INTERNAL_ERROR;
+			*error_r = t_strdup_printf(
+				"Failed to get quota root rule limits for %s: %s",
+				mailbox_name, error);
+			return -1;
+		}
+		if (!ignored)
+			ctx->no_quota_updates = FALSE;
+
+		if (bytes_limit > 0) {
+			ret = quota_get_resource(roots[i], mailbox_name,
+						 QUOTA_NAME_STORAGE_BYTES,
+						 &current, &limit, &error);
+			if (ret == QUOTA_GET_RESULT_LIMITED) {
+				if (limit <= current) {
+					/* over quota */
+					ctx->bytes_ceil = 0;
+					ctx->bytes_ceil2 = 0;
+					diff = current - limit;
+					if (ctx->bytes_over < diff)
+						ctx->bytes_over = diff;
+				} else {
+					diff = limit - current;
+					if (ctx->bytes_ceil2 > diff)
+						ctx->bytes_ceil2 = diff;
+					diff += !use_grace ? 0 :
+						roots[i]->set->last_mail_max_extra_bytes;
+					if (ctx->bytes_ceil > diff)
+						ctx->bytes_ceil = diff;
+				}
+			} else if (ret <= QUOTA_GET_RESULT_INTERNAL_ERROR) {
+				ctx->failed = TRUE;
+				*error_result_r = ret;
+				*error_r = t_strdup_printf(
+					"Failed to get quota resource "
+					QUOTA_NAME_STORAGE_BYTES" for %s: %s",
+					mailbox_name, error);
+				return -1;
+			}
+		}
+
+		if (count_limit > 0) {
+			ret = quota_get_resource(roots[i], mailbox_name,
+						 QUOTA_NAME_MESSAGES,
+						 &current, &limit, &error);
+			if (ret == QUOTA_GET_RESULT_LIMITED) {
+				if (limit <= current) {
+					/* over quota */
+					ctx->count_ceil = 0;
+					diff = current - limit;
+					if (ctx->count_over < diff)
+						ctx->count_over = diff;
+				} else {
+					diff = limit - current;
+					if (ctx->count_ceil > diff)
+						ctx->count_ceil = diff;
+				}
+			} else if (ret <= QUOTA_GET_RESULT_INTERNAL_ERROR) {
+				ctx->failed = TRUE;
+				*error_result_r = ret;
+				*error_r = t_strdup_printf(
+					"Failed to get quota resource "
+					QUOTA_NAME_MESSAGES" for %s: %s",
+					mailbox_name, error);
+				return -1;
+			}
+		}
+	}
+	return 0;
+}
+
+static void quota_warning_execute(struct quota_root *root, const char *cmd,
+				  const char *last_arg, const char *reason)
+{
+	const char *socket_path, *const *args, *error, *scheme, *ptr;
+
+	struct program_client_settings set = {
+		.client_connect_timeout_msecs = 1000,
+		.debug = root->quota->user->mail_debug,
+	};
+	struct program_client *pc;
+
+	restrict_access_init(&set.restrict_set);
+
+	e_debug(root->quota->event, "Executing warning: %s (because %s)", cmd, reason);
+
+	args = t_strsplit_spaces(cmd, " ");
+	if (last_arg != NULL) {
+		unsigned int count = str_array_length(args);
+		const char **new_args = t_new(const char *, count + 2);
+
+		memcpy(new_args, args, sizeof(const char *) * count);
+		new_args[count] = last_arg;
+		args = new_args;
+	}
+	socket_path = args[0];
+
+	if ((ptr = strchr(socket_path, ':')) != NULL) {
+		scheme = t_strcut(socket_path, ':');
+		socket_path = ptr+1;
+	} else {
+		scheme = "unix";
+	}
+
+	if (*socket_path != '/' &&
+	    strcmp(scheme, "unix") == 0)
+		socket_path =
+			t_strconcat(root->quota->user->set->base_dir,
+				    "/", socket_path, NULL);
+
+	socket_path = t_strdup_printf("%s:%s", scheme, socket_path);
+
+	args++;
+
+	if (program_client_create(socket_path, args, &set, TRUE,
+				  &pc, &error) < 0) {
+		e_error(root->quota->event,
+			"program_client_create(%s) failed: %s", socket_path,
+			error);
+		return;
+	}
+
+	(void)program_client_run(pc);
+
+	program_client_destroy(&pc);
+}
+
+static void quota_warnings_execute(struct quota_transaction_context *ctx,
+				   struct quota_root *root)
+{
+	struct quota_warning_rule *warnings;
+	unsigned int i, count;
+	uint64_t bytes_current, bytes_before, bytes_limit;
+	uint64_t count_current, count_before, count_limit;
+	const char *reason, *error;
+
+	warnings = array_get_modifiable(&root->set->warning_rules, &count);
+	if (count == 0)
+		return;
+
+	if (quota_get_resource(root, "", QUOTA_NAME_STORAGE_BYTES,
+			       &bytes_current, &bytes_limit, &error) == QUOTA_GET_RESULT_INTERNAL_ERROR) {
+		e_error(root->quota->event,
+			"Failed to get quota resource "QUOTA_NAME_STORAGE_BYTES
+			": %s", error);
+		return;
+	}
+	if (quota_get_resource(root, "", QUOTA_NAME_MESSAGES,
+			       &count_current, &count_limit, &error) == QUOTA_GET_RESULT_INTERNAL_ERROR) {
+		e_error(root->quota->event,
+			"Failed to get quota resource "QUOTA_NAME_MESSAGES
+			": %s", error);
+		return;
+	}
+
+	if (ctx->bytes_used > 0 && bytes_current < (uint64_t)ctx->bytes_used)
+		bytes_before = 0;
+	else
+		bytes_before = (int64_t)bytes_current - ctx->bytes_used;
+
+	if (ctx->count_used > 0 && count_current < (uint64_t)ctx->count_used)
+		count_before = 0;
+	else
+		count_before = (int64_t)count_current - ctx->count_used;
+	for (i = 0; i < count; i++) {
+		if (quota_warning_match(&warnings[i],
+					bytes_before, bytes_current,
+					count_before, count_current,
+					&reason)) {
+			quota_warning_execute(root, warnings[i].command,
+					      NULL, reason);
+			break;
+		}
+	}
+}
+
+int quota_transaction_commit(struct quota_transaction_context **_ctx)
+{
+	struct quota_transaction_context *ctx = *_ctx;
+	struct quota_rule *rule;
+	struct quota_root *const *roots;
+	unsigned int i, count;
+	const char *mailbox_name;
+	int ret = 0;
+
+	*_ctx = NULL;
+
+	if (ctx->failed)
+		ret = -1;
+	else if (ctx->bytes_used != 0 || ctx->count_used != 0 ||
+		 ctx->recalculate != QUOTA_RECALCULATE_DONT) T_BEGIN {
+		ARRAY(struct quota_root *) warn_roots;
+
+		mailbox_name = mailbox_get_vname(ctx->box);
+		(void)mail_namespace_find_unalias(
+			ctx->box->storage->user->namespaces, &mailbox_name);
+
+		roots = array_get(&ctx->quota->roots, &count);
+		t_array_init(&warn_roots, count);
+		for (i = 0; i < count; i++) {
+			if (!quota_root_is_visible(roots[i], ctx->box))
+				continue;
+
+			rule = quota_root_rule_find(roots[i]->set,
+						    mailbox_name);
+			if (rule != NULL && rule->ignore) {
+				/* mailbox not included in quota */
+				continue;
+			}
+
+			const char *error;
+			if (roots[i]->backend.v.update(roots[i], ctx, &error) < 0) {
+				e_error(ctx->quota->event,
+					"Failed to update quota for %s: %s",
+					mailbox_name, error);
+				ret = -1;
+			}
+			else if (!ctx->sync_transaction)
+				array_push_back(&warn_roots, &roots[i]);
+		}
+		/* execute quota warnings after all updates. this makes it
+		   work correctly regardless of whether backend.get_resource()
+		   returns updated values before backend.update() or not.
+		   warnings aren't executed when dsync bring the user over,
+		   because the user probably already got the warning on the
+		   other replica. */
+		array_foreach(&warn_roots, roots)
+			quota_warnings_execute(ctx, *roots);
+	} T_END;
+
+	i_free(ctx);
+	return ret;
+}
+
+static bool quota_over_flag_init_root(struct quota_root *root,
+				      const char **quota_over_script_r,
+				      const char **quota_over_flag_r,
+				      bool *status_r)
+{
+	const char *name, *flag_mask;
+
+	*quota_over_flag_r = NULL;
+	*status_r = FALSE;
+
+	name = t_strconcat(root->set->set_name, "_over_script", NULL);
+	*quota_over_script_r = mail_user_plugin_getenv(root->quota->user, name);
+	if (*quota_over_script_r == NULL) {
+		e_debug(root->quota->event, "quota_over_flag check: "
+			"%s unset - skipping", name);
+		return FALSE;
+	}
+
+	/* e.g.: quota_over_flag_value=TRUE or quota_over_flag_value=*  */
+	name = t_strconcat(root->set->set_name, "_over_flag_value", NULL);
+	flag_mask = mail_user_plugin_getenv(root->quota->user, name);
+	if (flag_mask == NULL) {
+		e_debug(root->quota->event, "quota_over_flag check: "
+			"%s unset - skipping", name);
+		return FALSE;
+	}
+
+	/* compare quota_over_flag's value (that comes from userdb) to
+	   quota_over_flag_value and save the result. */
+	name = t_strconcat(root->set->set_name, "_over_flag", NULL);
+	*quota_over_flag_r = mail_user_plugin_getenv(root->quota->user, name);
+	*status_r = *quota_over_flag_r != NULL &&
+		wildcard_match_icase(*quota_over_flag_r, flag_mask);
+	return TRUE;
+}
+
+static void quota_over_flag_check_root(struct quota_root *root)
+{
+	const char *quota_over_script, *quota_over_flag, *error;
+	const char *const *resources;
+	unsigned int i;
+	uint64_t value, limit;
+	bool cur_overquota = FALSE;
+	bool quota_over_status;
+	enum quota_get_result ret;
+
+	if (root->quota_over_flag_checked)
+		return;
+	if (root->quota->user->session_create_time +
+	    QUOTA_OVER_FLAG_MAX_DELAY_SECS < ioloop_time) {
+		/* userdb's quota_over_flag lookup is too old. */
+		e_debug(root->quota->event, "quota_over_flag check: "
+			"Flag lookup time is too old - skipping");
+		return;
+	}
+	if (root->quota->user->session_restored) {
+		/* we don't know whether the quota_over_script was executed
+		   before hibernation. just assume that it was, so we don't
+		   unnecessarily call it too often. */
+		e_debug(root->quota->event, "quota_over_flag check: "
+			"Session was already hibernated - skipping");
+		return;
+	}
+	root->quota_over_flag_checked = TRUE;
+	if (!quota_over_flag_init_root(root, &quota_over_script,
+				       &quota_over_flag, &quota_over_status))
+		return;
+
+	resources = quota_root_get_resources(root);
+	for (i = 0; resources[i] != NULL; i++) {
+		ret = quota_get_resource(root, "", resources[i], &value,
+					 &limit, &error);
+		if (ret == QUOTA_GET_RESULT_INTERNAL_ERROR) {
+			/* can't reliably verify this */
+			e_error(root->quota->event, "Quota %s lookup failed -"
+				"can't verify quota_over_flag: %s",
+				resources[i], error);
+			return;
+		}
+		e_debug(root->quota->event, "quota_over_flag check: %s ret=%d"
+			"value=%"PRIu64" limit=%"PRIu64, resources[i], ret,
+			value, limit);
+		if (ret == QUOTA_GET_RESULT_LIMITED && value >= limit)
+			cur_overquota = TRUE;
+	}
+	e_debug(root->quota->event, "quota_over_flag=%d(%s) vs currently overquota=%d",
+		quota_over_status ? 1 : 0,
+		quota_over_flag == NULL ? "(null)" : quota_over_flag,
+		cur_overquota ? 1 : 0);
+	if (cur_overquota != quota_over_status) {
+		quota_warning_execute(root, quota_over_script, quota_over_flag,
+				      "quota_over_flag mismatch");
+	}
+}
+
+void quota_over_flag_check_startup(struct quota *quota)
+{
+	struct quota_root *const *roots;
+	unsigned int i, count;
+	const char *name;
+
+	roots = array_get(&quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		name = t_strconcat(roots[i]->set->set_name, "_over_flag_lazy_check", NULL);
+		if (!mail_user_plugin_getenv_bool(roots[i]->quota->user, name))
+			quota_over_flag_check_root(roots[i]);
+	}
+}
+
+void quota_transaction_rollback(struct quota_transaction_context **_ctx)
+{
+	struct quota_transaction_context *ctx = *_ctx;
+
+	*_ctx = NULL;
+	i_free(ctx);
+}
+
+static int quota_get_mail_size(struct quota_transaction_context *ctx,
+			       struct mail *mail, uoff_t *size_r)
+{
+	if (ctx->quota->set->vsizes)
+		return mail_get_virtual_size(mail, size_r);
+	else
+		return mail_get_physical_size(mail, size_r);
+}
+
+enum quota_alloc_result quota_try_alloc(struct quota_transaction_context *ctx,
+					struct mail *mail, const char **error_r)
+{
+	uoff_t size;
+	const char *error;
+	enum quota_get_result error_res;
+
+	if (quota_transaction_set_limits(ctx, &error_res, error_r) < 0) {
+		if (error_res == QUOTA_GET_RESULT_BACKGROUND_CALC)
+			return QUOTA_ALLOC_RESULT_BACKGROUND_CALC;
+		return QUOTA_ALLOC_RESULT_TEMPFAIL;
+	}
+
+	if (ctx->no_quota_updates)
+		return QUOTA_ALLOC_RESULT_OK;
+
+	if (quota_get_mail_size(ctx, mail, &size) < 0) {
+		enum mail_error err;
+		error = mailbox_get_last_internal_error(mail->box, &err);
+
+		if (err == MAIL_ERROR_EXPUNGED) {
+			/* mail being copied was already expunged. it'll fail,
+			   so just return success for the quota allocated. */
+			return QUOTA_ALLOC_RESULT_OK;
+		}
+		*error_r = t_strdup_printf(
+			"Failed to get mail size (box=%s, uid=%u): %s",
+			mail->box->vname, mail->uid, error);
+		return QUOTA_ALLOC_RESULT_TEMPFAIL;
+	}
+
+	enum quota_alloc_result ret = quota_test_alloc(ctx, size, error_r);
+	if (ret != QUOTA_ALLOC_RESULT_OK)
+		return ret;
+	/* with quota_try_alloc() we want to keep track of how many bytes
+	   we've been adding/removing, so disable auto_updating=TRUE
+	   optimization. this of course doesn't work perfectly if
+	   quota_alloc() or quota_free_bytes() was already used within the same
+	   transaction, but that doesn't normally happen. */
+	ctx->auto_updating = FALSE;
+	quota_alloc(ctx, mail);
+	return QUOTA_ALLOC_RESULT_OK;
+}
+
+enum quota_alloc_result quota_test_alloc(struct quota_transaction_context *ctx,
+					 uoff_t size, const char **error_r)
+{
+	if (ctx->failed) {
+		*error_r = "Quota transaction has failed earlier";
+		return QUOTA_ALLOC_RESULT_TEMPFAIL;
+	}
+
+	enum quota_get_result error_res;
+	if (quota_transaction_set_limits(ctx, &error_res, error_r) < 0) {
+		if (error_res == QUOTA_GET_RESULT_BACKGROUND_CALC)
+			return QUOTA_ALLOC_RESULT_BACKGROUND_CALC;
+		return QUOTA_ALLOC_RESULT_TEMPFAIL;
+	}
+
+	uoff_t max_size = ctx->quota->set->max_mail_size;
+	if (max_size > 0 && size > max_size) {
+		*error_r = t_strdup_printf(
+			"Requested allocation size %"PRIuUOFF_T" exceeds max "
+			"mail size %"PRIuUOFF_T, size, max_size);
+		return QUOTA_ALLOC_RESULT_OVER_MAXSIZE;
+	}
+
+	if (ctx->no_quota_updates)
+		return QUOTA_ALLOC_RESULT_OK;
+	/* this is a virtual function mainly for trash plugin and similar,
+	   which may automatically delete mails to stay under quota. */
+	return ctx->quota->set->test_alloc(ctx, size, error_r);
+}
+
+static enum quota_alloc_result quota_default_test_alloc(
+			struct quota_transaction_context *ctx, uoff_t size,
+			const char **error_r)
+{
+	struct quota_root *const *roots;
+	unsigned int i, count;
+	bool ignore;
+	int ret;
+
+	if (!quota_transaction_is_over(ctx, size))
+		return QUOTA_ALLOC_RESULT_OK;
+
+	/* limit reached. */
+	roots = array_get(&ctx->quota->roots, &count);
+	for (i = 0; i < count; i++) {
+		uint64_t bytes_limit, count_limit;
+
+		if (!quota_root_is_visible(roots[i], ctx->box) ||
+		    roots[i]->no_enforcing)
+			continue;
+
+		const char *error;
+		ret = quota_root_get_rule_limits(roots[i],
+						 mailbox_get_vname(ctx->box),
+						 &bytes_limit, &count_limit,
+						 &ignore, &error);
+		if (ret < 0) {
+			*error_r = t_strdup_printf(
+				"Failed to get quota root rule limits: %s",
+				error);
+			return QUOTA_ALLOC_RESULT_TEMPFAIL;
+		}
+
+		/* if size is bigger than any limit, then
+		   it is bigger than the lowest limit */
+		if (bytes_limit > 0 && size > bytes_limit) {
+			*error_r = t_strdup_printf(
+				"Allocating %"PRIuUOFF_T" bytes would exceed quota limit",
+				size);
+			return QUOTA_ALLOC_RESULT_OVER_QUOTA_LIMIT;
+		}
+	}
+	*error_r = t_strdup_printf(
+		"Allocating %"PRIuUOFF_T" bytes would exceed quota", size);
+	return QUOTA_ALLOC_RESULT_OVER_QUOTA;
+}
+
+void quota_alloc(struct quota_transaction_context *ctx, struct mail *mail)
+{
+	uoff_t size;
+
+	if (!ctx->auto_updating) {
+		if (quota_get_mail_size(ctx, mail, &size) == 0)
+			ctx->bytes_used += size;
+	}
+
+	ctx->bytes_ceil = ctx->bytes_ceil2;
+	ctx->count_used++;
+}
+
+void quota_free_bytes(struct quota_transaction_context *ctx,
+		      uoff_t physical_size)
+{
+	i_assert(physical_size <= INT64_MAX);
+	ctx->bytes_used -= (int64_t)physical_size;
+	ctx->count_used--;
+}
+
+void quota_recalculate(struct quota_transaction_context *ctx,
+		       enum quota_recalculate recalculate)
+{
+	ctx->recalculate = recalculate;
+}
+
+static void hidden_param_handler(struct quota_root *_root, const char *param_value ATTR_UNUSED)
+{
+	_root->hidden = TRUE;
+}
+
+static void ignoreunlim_param_handler(struct quota_root *_root, const char *param_value ATTR_UNUSED)
+{
+	_root->disable_unlimited_tracking = TRUE;
+}
+
+static void noenforcing_param_handler(struct quota_root *_root, const char *param_value ATTR_UNUSED)
+{
+	_root->no_enforcing = TRUE;
+}
+
+static void ns_param_handler(struct quota_root *_root, const char *param_value)
+{
+	_root->ns_prefix = p_strdup(_root->pool, param_value);
+}
+
+int quota_parse_parameters(struct quota_root *root, const char **args, const char **error_r,
+			   const struct quota_param_parser *valid_params, bool fail_on_unknown)
+{
+	const char *tmp_param_name, *tmp_param_val;
+	size_t tmp_param_len;
+
+	while (*args != NULL && (*args)[0] != '\0') {
+		for (; valid_params->param_name != NULL; ++valid_params) {
+			tmp_param_name = valid_params->param_name;
+			tmp_param_len = strlen(valid_params->param_name);
+			i_assert(*args != NULL);
+			if (strncmp(*args, tmp_param_name, tmp_param_len) == 0) {
+				tmp_param_val = NULL;
+				*args += tmp_param_len;
+				if (tmp_param_name[tmp_param_len - 1] == '=') {
+					const char *next_colon = strchr(*args, ':');
+					tmp_param_val = (next_colon == NULL)?
+						t_strdup(*args):
+						t_strdup_until(*args, next_colon);
+					*args = (next_colon == NULL) ? NULL : next_colon + 1;
+				}
+				else if ((*args)[0] == '\0' ||
+					 (*args)[0] == ':') {
+					*args = ((*args)[0] == ':') ? *args + 1 : NULL;
+					/* in case parameter is a boolean second parameter
+					 * string parameter value will be ignored by param_handler
+					 * we just need some non-NULL value
+					 * to indicate that argument is to be processed */
+					tmp_param_val = "";
+				}
+				if (tmp_param_val != NULL) {
+					valid_params->param_handler(root, tmp_param_val);
+					break;
+				}
+			}
+		}
+		if (valid_params->param_name == NULL) {
+			if (fail_on_unknown) {
+				*error_r = t_strdup_printf(
+					"Unknown parameter for backend %s: %s",
+					root->backend.name, *args);
+				return -1;
+			}
+			else {
+				break;
+			}
+		}
+	}
+	return 0;
+}
diff --git a/src/plugins/quota/quota.h b/src/plugins/quota/quota.h
new file mode 100644
index 0000000..8de2d8e
--- /dev/null
+++ b/src/plugins/quota/quota.h
@@ -0,0 +1,147 @@
+#ifndef QUOTA_H
+#define QUOTA_H
+
+struct mail;
+struct mailbox;
+struct mail_user;
+
+/* Message storage size kilobytes. */
+#define QUOTA_NAME_STORAGE_KILOBYTES "STORAGE"
+/* Message storage size bytes. This is used only internally. */
+#define QUOTA_NAME_STORAGE_BYTES "STORAGE_BYTES"
+/* Number of messages. */
+#define QUOTA_NAME_MESSAGES "MESSAGE"
+
+struct quota;
+struct quota_settings;
+struct quota_root_settings;
+struct quota_root;
+struct quota_root_iter;
+struct quota_transaction_context;
+
+struct quota_param_parser {
+	char *param_name;
+	void (* param_handler)(struct quota_root *_root, const char *param_value);
+};
+
+extern struct quota_param_parser quota_param_hidden;
+extern struct quota_param_parser quota_param_ignoreunlimited;
+extern struct quota_param_parser quota_param_noenforcing;
+extern struct quota_param_parser quota_param_ns;
+
+enum quota_recalculate {
+	QUOTA_RECALCULATE_DONT = 0,
+	/* We may want to recalculate quota because we weren't able to call
+	   quota_free*() correctly for all mails. Quota needs to be
+	   recalculated unless the backend does the quota tracking
+	   internally. */
+	QUOTA_RECALCULATE_MISSING_FREES,
+	/* doveadm quota recalc called - make sure the quota is correct */
+	QUOTA_RECALCULATE_FORCED
+};
+
+enum quota_alloc_result {
+	QUOTA_ALLOC_RESULT_OK,
+	QUOTA_ALLOC_RESULT_TEMPFAIL,
+	QUOTA_ALLOC_RESULT_OVER_MAXSIZE,
+	QUOTA_ALLOC_RESULT_OVER_QUOTA,
+	/* Mail size is larger than even the maximum allowed quota. */
+	QUOTA_ALLOC_RESULT_OVER_QUOTA_LIMIT,
+	/* Blocked by ongoing background quota calculation. */
+	QUOTA_ALLOC_RESULT_BACKGROUND_CALC,
+};
+
+/* Anything <= QUOTA_GET_RESULT_INTERNAL_ERROR is an error. */
+enum quota_get_result {
+	/* Ongoing background quota calculation */
+	QUOTA_GET_RESULT_BACKGROUND_CALC,
+	/* Quota resource name doesn't exist */
+	QUOTA_GET_RESULT_UNKNOWN_RESOURCE,
+	/* Internal error */
+	QUOTA_GET_RESULT_INTERNAL_ERROR,
+
+	/* Quota limit exists and was returned successfully */
+	QUOTA_GET_RESULT_LIMITED,
+	/* Quota is unlimited, but its value was returned */
+	QUOTA_GET_RESULT_UNLIMITED,
+};
+
+const char *quota_alloc_result_errstr(enum quota_alloc_result res,
+		struct quota_transaction_context *qt);
+
+int quota_user_read_settings(struct mail_user *user,
+			     struct quota_settings **set_r,
+			     const char **error_r);
+void quota_settings_deinit(struct quota_settings **quota_set);
+
+/* Add a new rule too the quota root. Returns 0 if ok, -1 if rule is invalid. */
+int quota_root_add_rule(struct quota_root_settings *root_set,
+			const char *rule_def, const char **error_r);
+/* Add a new warning rule for the quota root. Returns 0 if ok, -1 if rule is
+   invalid. */
+int quota_root_add_warning_rule(struct quota_root_settings *root_set,
+				const char *rule_def, const char **error_r);
+
+/* Initialize quota for the given user. Returns 0 and quota_r on success,
+   -1 and error_r on failure. */
+int quota_init(struct quota_settings *quota_set, struct mail_user *user,
+	       struct quota **quota_r, const char **error_r);
+void quota_deinit(struct quota **quota);
+
+/* List all visible quota roots. They don't need to be freed. */
+struct quota_root_iter *quota_root_iter_init_user(struct mail_user *user);
+struct quota_root_iter *quota_root_iter_init(struct mailbox *box);
+struct quota_root *quota_root_iter_next(struct quota_root_iter *iter);
+void quota_root_iter_deinit(struct quota_root_iter **iter);
+
+/* Return quota root or NULL. */
+struct quota_root *quota_root_lookup(struct mail_user *user, const char *name);
+
+/* Returns name of the quota root. */
+const char *quota_root_get_name(struct quota_root *root);
+/* Return a list of all resources set for the quota root. */
+const char *const *quota_root_get_resources(struct quota_root *root);
+/* Returns TRUE if quota root is marked as hidden (so it shouldn't be visible
+   to users via IMAP GETQUOTAROOT command). */
+bool quota_root_is_hidden(struct quota_root *root);
+
+/* Returns 1 if values were successfully returned, 0 if resource name doesn't
+   exist or isn't enabled, -1 if error. */
+enum quota_get_result
+quota_get_resource(struct quota_root *root, const char *mailbox_name,
+		   const char *name, uint64_t *value_r, uint64_t *limit_r,
+		   const char **error_r);
+/* Returns 0 if OK, -1 if error (eg. permission denied, invalid name). */
+int quota_set_resource(struct quota_root *root, const char *name,
+		       uint64_t value, const char **client_error_r);
+
+/* Start a new quota transaction. */
+struct quota_transaction_context *quota_transaction_begin(struct mailbox *box);
+/* Commit quota transaction. Returns 0 if ok, -1 if failed. */
+int quota_transaction_commit(struct quota_transaction_context **ctx);
+/* Rollback quota transaction changes. */
+void quota_transaction_rollback(struct quota_transaction_context **ctx);
+
+/* Allocate from quota if there's space. error_r is set when result is not
+ * QUOTA_ALLOC_RESULT_OK. */
+enum quota_alloc_result quota_try_alloc(struct quota_transaction_context *ctx,
+					struct mail *mail, const char **error_r);
+/* Like quota_try_alloc(), but don't actually allocate anything. */
+enum quota_alloc_result quota_test_alloc(struct quota_transaction_context *ctx,
+					 uoff_t size, const char **error_r);
+/* Update quota by allocating/freeing space used by mail. */
+void quota_alloc(struct quota_transaction_context *ctx, struct mail *mail);
+void quota_free_bytes(struct quota_transaction_context *ctx,
+		      uoff_t physical_size);
+/* Mark the quota to be recalculated */
+void quota_recalculate(struct quota_transaction_context *ctx,
+		       enum quota_recalculate recalculate);
+
+/* Execute quota_over_scripts if needed. */
+void quota_over_flag_check_startup(struct quota *quota);
+
+/* Common quota parameters parsing loop */
+int quota_parse_parameters(struct quota_root *root, const char **args, const char **error_r,
+			   const struct quota_param_parser *valid_params, bool fail_on_unknown);
+
+#endif
diff --git a/src/plugins/quota/rquota.x b/src/plugins/quota/rquota.x
new file mode 100644
index 0000000..3cd5c10
--- /dev/null
+++ b/src/plugins/quota/rquota.x
@@ -0,0 +1,139 @@
+/* @(#)rquota.x	2.1 88/08/01 4.0 RPCSRC */
+/* @(#)rquota.x 1.2 87/09/20 Copyr 1987 Sun Micro */
+
+/*
+ * Remote quota protocol
+ * Requires unix authentication
+ */
+
+const RQ_PATHLEN = 1024;
+
+struct sq_dqblk {
+	unsigned int rq_bhardlimit;	/* absolute limit on disk blks alloc */
+	unsigned int rq_bsoftlimit;	/* preferred limit on disk blks */
+	unsigned int rq_curblocks;	/* current block count */
+	unsigned int rq_fhardlimit;	/* absolute limit on allocated files */
+	unsigned int rq_fsoftlimit;	/* preferred file limit */
+	unsigned int rq_curfiles;	/* current # allocated files */
+	unsigned int rq_btimeleft;	/* time left for excessive disk use */
+	unsigned int rq_ftimeleft;	/* time left for excessive files */
+};
+
+struct getquota_args {
+	string gqa_pathp<RQ_PATHLEN>;  	/* path to filesystem of interest */
+	int gqa_uid;			/* Inquire about quota for uid */
+};
+
+struct setquota_args {
+	int sqa_qcmd;
+	string sqa_pathp<RQ_PATHLEN>;  	/* path to filesystem of interest */
+	int sqa_id;			/* Set quota for uid */
+	sq_dqblk sqa_dqblk;
+};
+
+struct ext_getquota_args {
+	string gqa_pathp<RQ_PATHLEN>;  	/* path to filesystem of interest */
+	int gqa_type;			/* Type of quota info is needed about */
+	int gqa_id;			/* Inquire about quota for id */
+};
+
+struct ext_setquota_args {
+	int sqa_qcmd;
+	string sqa_pathp<RQ_PATHLEN>;  	/* path to filesystem of interest */
+	int sqa_id;			/* Set quota for id */
+	int sqa_type;			/* Type of quota to set */
+	sq_dqblk sqa_dqblk;
+};
+
+/*
+ * remote quota structure
+ */
+struct rquota {
+	int rq_bsize;			/* block size for block counts */
+	bool rq_active;  		/* indicates whether quota is active */
+	unsigned int rq_bhardlimit;	/* absolute limit on disk blks alloc */
+	unsigned int rq_bsoftlimit;	/* preferred limit on disk blks */
+	unsigned int rq_curblocks;	/* current block count */
+	unsigned int rq_fhardlimit;	/* absolute limit on allocated files */
+	unsigned int rq_fsoftlimit;	/* preferred file limit */
+	unsigned int rq_curfiles;	/* current # allocated files */
+	unsigned int rq_btimeleft;	/* time left for excessive disk use */
+	unsigned int rq_ftimeleft;	/* time left for excessive files */
+};	
+
+enum qr_status {
+	Q_OK = 1,	/* quota returned */
+	Q_NOQUOTA = 2,  /* noquota for uid */
+	Q_EPERM = 3	/* no permission to access quota */
+};
+
+union getquota_rslt switch (qr_status status) {
+case Q_OK:
+	rquota gqr_rquota;	/* valid if status == Q_OK */
+case Q_NOQUOTA:
+	void;
+case Q_EPERM:
+	void;
+};
+
+union setquota_rslt switch (qr_status status) {
+case Q_OK:
+	rquota sqr_rquota;	/* valid if status == Q_OK */
+case Q_NOQUOTA:
+	void;
+case Q_EPERM:
+	void;
+};
+
+program RQUOTAPROG {
+	version RQUOTAVERS {
+		/*
+		 * Get all quotas
+		 */
+		getquota_rslt
+		RQUOTAPROC_GETQUOTA(getquota_args) = 1;
+
+		/*
+	 	 * Get active quotas only
+		 */
+		getquota_rslt
+		RQUOTAPROC_GETACTIVEQUOTA(getquota_args) = 2;
+
+		/*
+		 * Set all quotas
+		 */
+		setquota_rslt
+		RQUOTAPROC_SETQUOTA(setquota_args) = 3;
+
+		/*
+	 	 * Get active quotas only
+		 */
+		setquota_rslt
+		RQUOTAPROC_SETACTIVEQUOTA(setquota_args) = 4;
+	} = 1;
+	version EXT_RQUOTAVERS {
+		/*
+		 * Get all quotas
+		 */
+		getquota_rslt
+		RQUOTAPROC_GETQUOTA(ext_getquota_args) = 1;
+
+		/*
+	 	 * Get active quotas only
+		 */
+		getquota_rslt
+		RQUOTAPROC_GETACTIVEQUOTA(ext_getquota_args) = 2;
+
+		/*
+		 * Set all quotas
+		 */
+		setquota_rslt
+		RQUOTAPROC_SETQUOTA(ext_setquota_args) = 3;
+
+		/*
+	 	 * Set active quotas only
+		 */
+		setquota_rslt
+		RQUOTAPROC_SETACTIVEQUOTA(ext_setquota_args) = 4;
+	} = 2;
+} = 100011;
diff --git a/src/plugins/quota/test-quota-util.c b/src/plugins/quota/test-quota-util.c
new file mode 100644
index 0000000..682cffe
--- /dev/null
+++ b/src/plugins/quota/test-quota-util.c
@@ -0,0 +1,96 @@
+/* Copyright (c) 2014-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "quota-private.h"
+#include "test-common.h"
+
+struct test {
+	uint64_t limit, initial_size;
+	int64_t transaction_diff;
+	uint64_t new_size;
+	bool is_over;
+};
+
+static void test_quota_transaction_is_over(void)
+{
+#define MAXU64 (uint64_t)-1
+#define MAXS64 9223372036854775807LL
+#define MINS64 (-MAXS64 - 1LL)
+	static const struct test tests[] = {
+		/* first test only with new_size=1. these are used for both
+		   count and bytes tests: */
+
+		/* limit,     init,     diff, new */
+		{      1,        0,        0,   1, FALSE },
+		{ MAXU64,   MAXU64,        0,   1, TRUE },
+		{ MAXU64, MAXU64-1,        0,   1, FALSE },
+		{ MAXU64, MAXU64-1,        1,   1, TRUE },
+		{ MAXU64-1, MAXU64-1,      0,   1, TRUE },
+		{ MAXU64-1, MAXU64-1,     -1,   1, FALSE },
+		{ MAXU64-2, MAXU64-1,     -1,   1, TRUE },
+		{ MAXU64-2, MAXU64-1,     -2,   1, FALSE },
+
+		/* these are for bytes tests: */
+
+		/* limit,   init,   diff,    new */
+		{ MAXU64, MAXU64,      0,      0, FALSE },
+		{ MAXU64, MAXU64-1,    1,      0, FALSE },
+		{ MAXU64-1, MAXU64,    1,      0, TRUE },
+		{ MAXU64-1, MAXU64,    0,      0, TRUE },
+		{ MAXU64-1, MAXU64,   -1,      0, FALSE },
+		{ MAXU64, MAXU64,      0,      1, TRUE },
+		{ MAXU64,      0,      0, MAXU64, FALSE },
+		{ MAXU64,      1,      0, MAXU64, TRUE },
+		{ MAXU64,      0,      1, MAXU64, TRUE },
+		{ MAXU64-1,    0,      0, MAXU64, TRUE },
+		{ MAXU64-1,    0,      0, MAXU64-1, FALSE },
+		{ MAXU64-1,    1,      0, MAXU64-1, TRUE },
+		{ MAXU64-1,    1,     -1, MAXU64-1, FALSE },
+		{ MAXU64, MAXU64,      0, MAXU64, TRUE },
+	};
+	struct quota_transaction_context ctx;
+	unsigned int i;
+
+	test_begin("quota transaction is over (count)");
+	for (i = 0; i < N_ELEMENTS(tests); i++) {
+		if (tests[i].new_size != 1)
+			continue;
+
+		i_zero(&ctx);
+		ctx.count_used = tests[i].transaction_diff;
+		if (tests[i].initial_size > tests[i].limit)
+			ctx.count_over = tests[i].initial_size - tests[i].limit;
+		else {
+			ctx.count_ceil = tests[i].limit - tests[i].initial_size;
+			i_assert(ctx.count_used < 0 ||
+				 (uint64_t)ctx.count_used <= ctx.count_ceil); /* test is broken otherwise */
+		}
+		test_assert_idx(quota_transaction_is_over(&ctx, 0) == tests[i].is_over, i);
+	}
+	test_end();
+
+	test_begin("quota transaction is over (bytes)");
+	for (i = 0; i < N_ELEMENTS(tests); i++) {
+		i_zero(&ctx);
+		ctx.count_ceil = 1;
+		ctx.bytes_used = tests[i].transaction_diff;
+		if (tests[i].initial_size > tests[i].limit)
+			ctx.bytes_over = tests[i].initial_size - tests[i].limit;
+		else {
+			ctx.bytes_ceil = tests[i].limit - tests[i].initial_size;
+			i_assert(ctx.bytes_used < 0 ||
+				 (uint64_t)ctx.bytes_used <= ctx.bytes_ceil); /* test is broken otherwise */
+		}
+		test_assert_idx(quota_transaction_is_over(&ctx, tests[i].new_size) == tests[i].is_over, i);
+	}
+	test_end();
+}
+
+int main(void)
+{
+	static void (*const test_functions[])(void) = {
+		test_quota_transaction_is_over,
+		NULL
+	};
+	return test_run(test_functions);
+}