writecache: support settings metadata_only and pause_writeback

Two new settings for tuning dm-writecache.

2 files changed, 24 insertions, 0 deletions

diff --git a/tools/lvchange.c b/tools/lvchange.c
index dfbefa000..db63eb9ea 100644
--- a/tools/lvchange.c
+++ b/tools/lvchange.c
@@ -665,6 +665,16 @@ static int _lvchange_writecache(struct cmd_context *cmd,
 		seg->writecache_settings.max_age = settings.max_age;
 		set_count++;
 	}
+	if (settings.metadata_only_set) {
+		seg->writecache_settings.metadata_only_set = settings.metadata_only_set;
+		seg->writecache_settings.metadata_only = settings.metadata_only;
+		set_count++;
+	}
+	if (settings.pause_writeback_set) {
+		seg->writecache_settings.pause_writeback_set = settings.pause_writeback_set;
+		seg->writecache_settings.pause_writeback = settings.pause_writeback;
+		set_count++;
+	}
 	if (settings.new_key && settings.new_val) {
 		seg->writecache_settings.new_key = settings.new_key;
 		seg->writecache_settings.new_val = settings.new_val;
diff --git a/tools/toollib.c b/tools/toollib.c
index ae6f311ba..d52c9e342 100644
--- a/tools/toollib.c
+++ b/tools/toollib.c
@@ -1473,6 +1473,20 @@ static int _get_one_writecache_setting(struct cmd_context *cmd, struct writecach
 		return 1;
 	}
 
+	if (!strncmp(key, "metadata_only", strlen("metadata_only"))) {
+		if (sscanf(val, "%u", &settings->metadata_only) != 1)
+			goto_bad;
+		settings->metadata_only_set = 1;
+		return 1;
+	}
+
+	if (!strncmp(key, "pause_writeback", strlen("pause_writeback"))) {
+		if (sscanf(val, "%u", &settings->pause_writeback) != 1)
+			goto_bad;
+		settings->pause_writeback_set = 1;
+		return 1;
+	}
+
 	if (settings->new_key) {
 		log_error("Setting %s is not recognized. Only one unrecognized setting is allowed.", key);
 		return 0;