[ndctl,3/5] ndctl, scrub: add ndctl_bus_start_scrub()

Commit Message

Dan Williams April 4, 2018, 9:12 p.m. UTC

Provide a helper routine to kick off a new ARS scrub if one is not
already running, or otherwise detect if ARS functionality is available.

Signed-off-by: Dan Williams <[e-mail]>
---
 ndctl/lib/libndctl.c   |   13 +++++++++++++
 ndctl/lib/libndctl.sym |    1 +
 ndctl/libndctl.h       |    1 +
 3 files changed, 15 insertions(+)

Patch

diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c
index ff0d44ffefe6..21dd7207ea5e 100644
--- a/ndctl/lib/libndctl.c
+++ b/ndctl/lib/libndctl.c
@@ -1146,6 +1146,19 @@  static int __ndctl_bus_get_scrub_state(struct ndctl_bus *bus,
 	}
 }
 
+NDCTL_EXPORT int ndctl_bus_start_scrub(struct ndctl_bus *bus)
+{
+	struct ndctl_ctx *ctx = ndctl_bus_get_ctx(bus);
+	int rc;
+
+	rc = sysfs_write_attr(ctx, bus->scrub_path, "1\n");
+	if (rc == -EBUSY)
+		return rc;
+	else if (rc < 0)
+		return -EOPNOTSUPP;
+	return 0;
+}
+
 NDCTL_EXPORT int ndctl_bus_get_scrub_state(struct ndctl_bus *bus)
 {
 	unsigned int scrub_count = 0;
diff --git a/ndctl/lib/libndctl.sym b/ndctl/lib/libndctl.sym
index 06cace96724f..fd8f37d1783e 100644
--- a/ndctl/lib/libndctl.sym
+++ b/ndctl/lib/libndctl.sym
@@ -353,4 +353,5 @@  global:
 	ndctl_region_get_persistence_domain;
 	ndctl_bus_get_persistence_domain;
 	ndctl_bus_get_scrub_state;
+	ndctl_bus_start_scrub;
 } LIBNDCTL_14;
diff --git a/ndctl/libndctl.h b/ndctl/libndctl.h
index 36c04d871bd5..e690f9483fbf 100644
--- a/ndctl/libndctl.h
+++ b/ndctl/libndctl.h
@@ -122,6 +122,7 @@  int ndctl_bus_wait_probe(struct ndctl_bus *bus);
 int ndctl_bus_wait_for_scrub_completion(struct ndctl_bus *bus);
 unsigned int ndctl_bus_get_scrub_count(struct ndctl_bus *bus);
 int ndctl_bus_get_scrub_state(struct ndctl_bus *bus);
+int ndctl_bus_start_scrub(struct ndctl_bus *bus);
 int ndctl_bus_has_error_injection(struct ndctl_bus *bus);
 
 struct ndctl_dimm;