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>

4 files changed, 1248 insertions, 0 deletions

diff --git a/src/plugins/trash/Makefile.am b/src/plugins/trash/Makefile.am
new file mode 100644
index 0000000..af15d13
--- /dev/null
+++ b/src/plugins/trash/Makefile.am
@@ -0,0 +1,23 @@
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+	-I$(top_srcdir)/src/plugins/quota
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+
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diff --git a/src/plugins/trash/Makefile.in b/src/plugins/trash/Makefile.in
new file mode 100644
index 0000000..8ebd77e
--- /dev/null
+++ b/src/plugins/trash/Makefile.in
@@ -0,0 +1,824 @@
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+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/plugins/quota
+
+lib11_trash_plugin_la_LDFLAGS = -module -avoid-version
+module_LTLIBRARIES = \
+	lib11_trash_plugin.la
+
+@DOVECOT_PLUGIN_DEPS_TRUE@lib11_trash_plugin_la_LIBADD = \
+@DOVECOT_PLUGIN_DEPS_TRUE@	../quota/lib10_quota_plugin.la
+
+lib11_trash_plugin_la_SOURCES = \
+	trash-plugin.c
+
+noinst_HEADERS = \
+	trash-plugin.h
+
+all: all-am
+
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+.SUFFIXES: .c .lo .o .obj
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+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
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+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/plugins/trash/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/plugins/trash/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
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+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
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+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
+	done; \
+	test -z "$$list2" || { \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(moduledir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(moduledir)" || exit 1; \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(moduledir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(moduledir)"; \
+	}
+
+uninstall-moduleLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@list='$(module_LTLIBRARIES)'; test -n "$(moduledir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(moduledir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(moduledir)/$$f"; \
+	done
+
+clean-moduleLTLIBRARIES:
+	-test -z "$(module_LTLIBRARIES)" || rm -f $(module_LTLIBRARIES)
+	@list='$(module_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+lib11_trash_plugin.la: $(lib11_trash_plugin_la_OBJECTS) $(lib11_trash_plugin_la_DEPENDENCIES) $(EXTRA_lib11_trash_plugin_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(lib11_trash_plugin_la_LINK) -rpath $(moduledir) $(lib11_trash_plugin_la_OBJECTS) $(lib11_trash_plugin_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/trash-plugin.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
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+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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+
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+	-rm -rf .libs _libs
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+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+distdir: $(BUILT_SOURCES)
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+
+distdir-am: $(DISTFILES)
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs:
+	for dir in "$(DESTDIR)$(moduledir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
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+install-exec: install-exec-am
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+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+installcheck: installcheck-am
+install-strip:
+	if test -z '$(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:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-moduleLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/trash-plugin.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+info: info-am
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+info-am:
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+install-data-am: install-moduleLTLIBRARIES
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+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/trash-plugin.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
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+pdf: pdf-am
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+uninstall-am: uninstall-moduleLTLIBRARIES
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+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-moduleLTLIBRARIES \
+	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-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-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-moduleLTLIBRARIES
+
+.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/trash/trash-plugin.c b/src/plugins/trash/trash-plugin.c
new file mode 100644
index 0000000..d918484
--- /dev/null
+++ b/src/plugins/trash/trash-plugin.c
@@ -0,0 +1,392 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "unichar.h"
+#include "istream.h"
+#include "mail-namespace.h"
+#include "mail-search-build.h"
+#include "quota-private.h"
+#include "quota-plugin.h"
+#include "trash-plugin.h"
+
+#include <unistd.h>
+#include <fcntl.h>
+
+#define INIT_TRASH_MAILBOX_COUNT 4
+#define MAX_RETRY_COUNT 3
+
+#define TRASH_USER_CONTEXT(obj) \
+	MODULE_CONTEXT(obj, trash_user_module)
+#define TRASH_USER_CONTEXT_REQUIRE(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, trash_user_module)
+
+struct trash_mailbox {
+	const char *name;
+	int priority; /* lower number = higher priority */
+
+	struct mail_namespace *ns;
+
+	/* temporarily set while cleaning: */
+	struct mailbox *box;
+	struct mailbox_transaction_context *trans;
+	struct mail_search_context *search_ctx;
+	struct mail *mail;
+};
+
+struct trash_user {
+	union mail_user_module_context module_ctx;
+
+	const char *config_file;
+	/* ordered by priority, highest first */
+	ARRAY(struct trash_mailbox) trash_boxes;
+};
+
+const char *trash_plugin_version = DOVECOT_ABI_VERSION;
+
+static MODULE_CONTEXT_DEFINE_INIT(trash_user_module,
+				  &mail_user_module_register);
+static enum quota_alloc_result (*trash_next_quota_test_alloc)(
+		struct quota_transaction_context *, uoff_t,
+		const char **error_r);
+
+static int trash_clean_mailbox_open(struct trash_mailbox *trash)
+{
+	struct mail_search_args *search_args;
+
+	trash->box = mailbox_alloc(trash->ns->list, trash->name, 0);
+	if (mailbox_open(trash->box) < 0) {
+		mailbox_free(&trash->box);
+		return 0;
+	}
+
+	if (mailbox_sync(trash->box, MAILBOX_SYNC_FLAG_FULL_READ) < 0)
+		return -1;
+
+	trash->trans = mailbox_transaction_begin(trash->box, 0, __func__);
+
+	search_args = mail_search_build_init();
+	mail_search_build_add_all(search_args);
+	trash->search_ctx = mailbox_search_init(trash->trans,
+						search_args, NULL,
+						MAIL_FETCH_PHYSICAL_SIZE |
+						MAIL_FETCH_RECEIVED_DATE, NULL);
+	mail_search_args_unref(&search_args);
+
+	return mailbox_search_next(trash->search_ctx, &trash->mail) ? 1 : 0;
+}
+
+static int trash_clean_mailbox_get_next(struct trash_mailbox *trash,
+					time_t *received_time_r)
+{
+	int ret;
+
+	if (trash->mail == NULL) {
+		if (trash->box == NULL)
+			ret = trash_clean_mailbox_open(trash);
+		else {
+			ret = mailbox_search_next(trash->search_ctx,
+						  &trash->mail) ? 1 : 0;
+		}
+		if (ret <= 0) {
+			*received_time_r = 0;
+			return ret;
+		}
+	}
+
+	if (mail_get_received_date(trash->mail, received_time_r) < 0)
+		return -1;
+	return 1;
+}
+
+static int trash_try_clean_mails(struct quota_transaction_context *ctx,
+				 uint64_t size_needed,
+				 unsigned int count_needed)
+{
+	struct trash_user *tuser = TRASH_USER_CONTEXT_REQUIRE(ctx->quota->user);
+	struct trash_mailbox *trashes;
+	struct event_reason *reason;
+	unsigned int i, j, count, oldest_idx;
+	time_t oldest, received = 0;
+	uint64_t size, size_expunged = 0;
+	unsigned int expunged_count = 0;
+	int ret = 0;
+
+	reason = event_reason_begin("trash:clean");
+
+	trashes = array_get_modifiable(&tuser->trash_boxes, &count);
+	for (i = 0; i < count; ) {
+		/* expunge oldest mails first in all trash boxes with
+		   same priority */
+		oldest_idx = count;
+		oldest = (time_t)-1;
+		for (j = i; j < count; j++) {
+			if (trashes[j].priority != trashes[i].priority)
+				break;
+
+			ret = trash_clean_mailbox_get_next(&trashes[j],
+							   &received);
+			if (ret < 0)
+				goto err;
+			if (ret > 0) {
+				if (oldest == (time_t)-1 || received < oldest) {
+					oldest = received;
+					oldest_idx = j;
+				}
+			}
+		}
+
+		if (oldest_idx < count) {
+			if (mail_get_physical_size(trashes[oldest_idx].mail,
+						   &size) < 0) {
+				/* maybe expunged already? */
+				trashes[oldest_idx].mail = NULL;
+				continue;
+			}
+
+			mail_expunge(trashes[oldest_idx].mail);
+			expunged_count++;
+			size_expunged += size;
+			if (size_expunged >= size_needed &&
+			    expunged_count >= count_needed)
+				break;
+			trashes[oldest_idx].mail = NULL;
+		} else {
+			/* find more mails from next priority's mailbox */
+			i = j;
+		}
+	}
+
+err:
+	for (i = 0; i < count; i++) {
+		struct trash_mailbox *trash = &trashes[i];
+
+		if (trash->box == NULL)
+			continue;
+
+		trash->mail = NULL;
+		(void)mailbox_search_deinit(&trash->search_ctx);
+
+		if (size_expunged >= size_needed &&
+		    expunged_count >= count_needed) {
+			(void)mailbox_transaction_commit(&trash->trans);
+			(void)mailbox_sync(trash->box, 0);
+		} else {
+			/* couldn't get enough space, don't expunge anything */
+                        mailbox_transaction_rollback(&trash->trans);
+		}
+
+		mailbox_free(&trash->box);
+	}
+	event_reason_end(&reason);
+
+	if (size_expunged < size_needed) {
+		e_debug(ctx->quota->user->event,
+			"trash plugin: Failed to remove enough messages "
+			"(needed %"PRIu64" bytes, expunged only %"PRIu64" bytes)",
+			size_needed, size_expunged);
+		return 0;
+	}
+	if (expunged_count < count_needed) {
+		e_debug(ctx->quota->user->event,
+			"trash plugin: Failed to remove enough messages "
+			"(needed %u messages, expunged only %u messages)",
+			count_needed, expunged_count);
+		return 0;
+	}
+
+	if (ctx->bytes_over > 0) {
+		/* user is over quota. drop the over-bytes first. */
+		i_assert(ctx->bytes_over <= size_expunged);
+		size_expunged -= ctx->bytes_over;
+		ctx->bytes_over = 0;
+	}
+	if (ctx->count_over > 0) {
+		/* user is over quota. drop the over-count first. */
+		i_assert(ctx->count_over <= expunged_count);
+		expunged_count -= ctx->count_over;
+		ctx->count_over = 0;
+	}
+
+	if (ctx->bytes_ceil > ((uint64_t)-1 - size_expunged)) {
+		ctx->bytes_ceil = (uint64_t)-1;
+	} else {
+		ctx->bytes_ceil += size_expunged;
+	}
+	if (ctx->count_ceil < ((uint64_t)-1 - expunged_count)) {
+		ctx->count_ceil = (uint64_t)-1;
+	} else {
+		ctx->count_ceil += expunged_count;
+	}
+	return 1;
+}
+
+static enum quota_alloc_result
+trash_quota_test_alloc(struct quota_transaction_context *ctx,
+		       uoff_t size, const char **error_r)
+{
+	int i;
+	uint64_t size_needed = 0;
+	unsigned int count_needed = 0;
+
+	for (i = 0; ; i++) {
+		enum quota_alloc_result ret;
+		ret = trash_next_quota_test_alloc(ctx, size, error_r);
+		if (ret != QUOTA_ALLOC_RESULT_OVER_QUOTA) {
+			if (ret == QUOTA_ALLOC_RESULT_OVER_QUOTA_LIMIT &&
+			    ctx->quota->user->mail_debug)
+				i_debug("trash plugin: Mail is larger than "
+					"quota, won't even try to handle");
+			return ret;
+		}
+
+		if (i == MAX_RETRY_COUNT) {
+			/* trash_try_clean_mails() should have returned 0 if
+			   it couldn't get enough space, but allow retrying
+			   it a couple of times if there was some extra space
+			   that was needed.. */
+			break;
+		}
+
+		if (ctx->bytes_ceil != (uint64_t)-1 &&
+		    ctx->bytes_ceil < size + ctx->bytes_over)
+			size_needed = size + ctx->bytes_over - ctx->bytes_ceil;
+		if (ctx->count_ceil != (uint64_t)-1 &&
+		    ctx->count_ceil < 1 + ctx->count_over)
+			count_needed = 1 + ctx->count_over - ctx->count_ceil;
+
+		/* not enough space. try deleting some from mailbox. */
+		if (trash_try_clean_mails(ctx, size_needed, count_needed) <= 0) {
+			*error_r = t_strdup_printf(
+				"Allocating %"PRIuUOFF_T" bytes would exceed quota", size);
+			return QUOTA_ALLOC_RESULT_OVER_QUOTA;
+		}
+	}
+	*error_r = t_strdup_printf(
+		"Allocating %"PRIuUOFF_T" bytes would exceed quota", size);
+	return QUOTA_ALLOC_RESULT_OVER_QUOTA;
+}
+
+static bool trash_find_storage(struct mail_user *user,
+			       struct trash_mailbox *trash)
+{
+	struct mail_namespace *ns;
+
+	ns = mail_namespace_find(user->namespaces, trash->name);
+	if ((ns->flags & NAMESPACE_FLAG_UNUSABLE) != 0)
+		return FALSE;
+
+	trash->ns = ns;
+	return TRUE;
+}
+
+static int trash_mailbox_priority_cmp(const struct trash_mailbox *t1,
+				      const struct trash_mailbox *t2)
+{
+	return t1->priority - t2->priority;
+}
+
+static int read_configuration(struct mail_user *user, const char *path)
+{
+	struct trash_user *tuser = TRASH_USER_CONTEXT_REQUIRE(user);
+	struct istream *input;
+	const char *line, *name;
+	struct trash_mailbox *trash;
+	int fd, ret = 0;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1) {
+		i_error("trash plugin: open(%s) failed: %m", path);
+		return -1;
+	}
+
+	p_array_init(&tuser->trash_boxes, user->pool, INIT_TRASH_MAILBOX_COUNT);
+
+	input = i_stream_create_fd(fd, SIZE_MAX);
+	i_stream_set_return_partial_line(input, TRUE);
+	while ((line = i_stream_read_next_line(input)) != NULL) {
+		/* <priority> <mailbox name> */
+		name = strchr(line, ' ');
+		if (name == NULL || name[1] == '\0' || *line == '#')
+			continue;
+
+		trash = array_append_space(&tuser->trash_boxes);
+		trash->name = p_strdup(user->pool, name+1);
+		if (str_to_int(t_strdup_until(line, name),
+			       &trash->priority) < 0) {
+			i_error("trash: Invalid priority for mailbox '%s'",
+				trash->name);
+			ret = -1;
+		}
+
+		if (!uni_utf8_str_is_valid(trash->name)) {
+			i_error("trash: Mailbox name not UTF-8: %s",
+				trash->name);
+			ret = -1;
+		}
+		if (!trash_find_storage(user, trash)) {
+			i_error("trash: Namespace not found for mailbox '%s'",
+				trash->name);
+			ret = -1;
+		}
+
+		e_debug(user->event, "trash plugin: Added '%s' with priority %d",
+			trash->name, trash->priority);
+	}
+	i_stream_destroy(&input);
+	i_close_fd(&fd);
+
+	array_sort(&tuser->trash_boxes, trash_mailbox_priority_cmp);
+	return ret;
+}
+
+static void
+trash_mail_user_created(struct mail_user *user)
+{
+	struct quota_user *quser = QUOTA_USER_CONTEXT(user);
+	struct trash_user *tuser;
+	const char *env;
+
+	env = mail_user_plugin_getenv(user, "trash");
+	if (env == NULL) {
+		e_debug(user->event, "trash: No trash setting - plugin disabled");
+	} else if (quser == NULL) {
+		i_error("trash plugin: quota plugin not initialized");
+	} else {
+		tuser = p_new(user->pool, struct trash_user, 1);
+		tuser->config_file = env;
+		MODULE_CONTEXT_SET(user, trash_user_module, tuser);
+	}
+}
+
+static void
+trash_mail_namespaces_created(struct mail_namespace *namespaces)
+{
+	struct mail_user *user = namespaces->user;
+	struct trash_user *tuser = TRASH_USER_CONTEXT(user);
+	struct quota_user *quser = QUOTA_USER_CONTEXT(user);
+
+	if (tuser != NULL && read_configuration(user, tuser->config_file) == 0) {
+		i_assert(quser != NULL);
+		trash_next_quota_test_alloc =
+			quser->quota->set->test_alloc;
+		quser->quota->set->test_alloc = trash_quota_test_alloc;
+	}
+}
+
+static struct mail_storage_hooks trash_mail_storage_hooks = {
+	.mail_user_created = trash_mail_user_created,
+	.mail_namespaces_created = trash_mail_namespaces_created,
+};
+
+void trash_plugin_init(struct module *module)
+{
+	mail_storage_hooks_add(module, &trash_mail_storage_hooks);
+}
+
+void trash_plugin_deinit(void)
+{
+	mail_storage_hooks_remove(&trash_mail_storage_hooks);
+}
+
+const char *trash_plugin_dependencies[] = { "quota", NULL };
diff --git a/src/plugins/trash/trash-plugin.h b/src/plugins/trash/trash-plugin.h
new file mode 100644
index 0000000..bd6db6b
--- /dev/null
+++ b/src/plugins/trash/trash-plugin.h
@@ -0,0 +1,9 @@
+#ifndef TRASH_PLUGIN_H
+#define TRASH_PLUGIN_H
+
+extern const char *trash_plugin_dependencies[];
+
+void trash_plugin_init(struct module *module);
+void trash_plugin_deinit(void);
+
+#endif