From 52d2b356e3ddb4e59ee09c10d47add9d3280284b Mon Sep 17 00:00:00 2001
From: Aki Tuomi <aki.tuomi@dovecot.fi>
Date: Mon, 21 Nov 2016 13:57:23 +0200
Subject: [PATCH] lib-index: Limit mmap errors in txn log file to 1/s

---
 src/lib-index/mail-transaction-log-file.c    | 7 +++++--
 src/lib-index/mail-transaction-log-private.h | 2 ++
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/lib-index/mail-transaction-log-file.c b/src/lib-index/mail-transaction-log-file.c
index 591be8dada..94884ba820 100644
--- a/src/lib-index/mail-transaction-log-file.c
+++ b/src/lib-index/mail-transaction-log-file.c
@@ -1623,8 +1623,11 @@ mail_transaction_log_file_mmap(struct mail_transaction_log_file *file)
 	if (file->mmap_base == MAP_FAILED) {
 		file->mmap_base = NULL;
 		file->mmap_size = 0;
-		log_file_set_syscall_error(file, t_strdup_printf(
-			"mmap(size=%"PRIuSIZE_T")", file->mmap_size));
+		if (ioloop_time != file->last_mmap_error_time) {
+			ioloop_time = file->last_mmap_error_time;
+			log_file_set_syscall_error(file, t_strdup_printf(
+				"mmap(size=%"PRIuSIZE_T")", file->mmap_size));
+		}
 		return -1;
 	}
 
diff --git a/src/lib-index/mail-transaction-log-private.h b/src/lib-index/mail-transaction-log-private.h
index 83c0cf42e6..a03939a5e9 100644
--- a/src/lib-index/mail-transaction-log-private.h
+++ b/src/lib-index/mail-transaction-log-private.h
@@ -46,6 +46,8 @@ struct mail_transaction_log_file {
 	time_t last_mtime;
 	uoff_t last_size;
 
+	time_t last_mmap_error_time;
+
 	struct mail_transaction_log_header hdr;
 	buffer_t mmap_buffer;
 	buffer_t *buffer;