[PATCH v6 3/4] ndctl: convert region actions to use util_filter_walk()

[Dave Jiang <dave.jiang@intel.com>]

util_filter_walk() does the looping through of busses and regions. Removing
duplicate code in region ops and provide filter functions so we can
utilize util_filter_walk() and share common code.

Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---
 ndctl/region.c |   54 +++++++++++++++++++++++++++++++-----------------------
 util/filter.h  |    6 ++++++
 2 files changed, 37 insertions(+), 23 deletions(-)

diff --git a/ndctl/region.c b/ndctl/region.c
index 9fc90808..fa8f15ad 100644
--- a/ndctl/region.c
+++ b/ndctl/region.c
@@ -19,10 +19,7 @@
 #include <util/parse-options.h>
 #include <ndctl/libndctl.h>
 
-static struct {
-	const char *bus;
-	const char *type;
-} param;
+struct util_filter_params param;
 
 static const struct option region_options[] = {
 	OPT_STRING('b', "bus", &param.bus, "bus-id",
@@ -92,33 +89,44 @@ static int region_action(struct ndctl_region *region, enum device_action mode)
 	return 0;
 }
 
+static bool filter_region(struct ndctl_region *region,
+		struct util_filter_ctx *ctx)
+{
+	struct rgaction_filter_arg *rfa = ctx->rgaction;
+	int rc;
+
+	if (rfa->rc < 0)
+		return false;
+
+	rc = region_action(region, rfa->action);
+
+	if (rc == 0)
+		rfa->rc++;
+	else
+		rfa->rc = 0;
+
+	/* we don't need to fall through, can continue the loop */
+	return false;
+}
+
 static int do_xable_region(const char *region_arg, enum device_action mode,
 		struct ndctl_ctx *ctx)
 {
-	int rc = -ENXIO, success = 0;
-	struct ndctl_region *region;
-	struct ndctl_bus *bus;
+	int rc = -ENXIO;
+	struct util_filter_ctx fctx = { 0 };
+	struct rgaction_filter_arg rfa = { 0 };
 
 	if (!region_arg)
 		goto out;
 
-        ndctl_bus_foreach(ctx, bus) {
-		if (!util_bus_filter(bus, param.bus))
-			continue;
-
-		ndctl_region_foreach(bus, region) {
-			const char *type = ndctl_region_get_type_name(region);
-
-			if (param.type && strcmp(param.type, type) != 0)
-				continue;
-			if (!util_region_filter(region, region_arg))
-				continue;
-			if (region_action(region, mode) == 0)
-				success++;
-		}
-	}
+	fctx.filter_bus = filter_bus_passthrough;
+	fctx.filter_region = filter_region;
+	fctx.rgaction = &rfa;
+	fctx.rgaction->action = mode;
+	rc = util_filter_walk(ctx, &fctx, &param);
+	if (rc == 0)
+		rc = fctx.rgaction->rc;
 
-	rc = success;
  out:
 	param.bus = NULL;
 	return rc;
diff --git a/util/filter.h b/util/filter.h
index e59bb8da..9aede013 100644
--- a/util/filter.h
+++ b/util/filter.h
@@ -57,6 +57,11 @@ struct nsaction_filter_arg {
 	int rc;
 };
 
+struct rgaction_filter_arg {
+	enum device_action action;
+	int rc;
+};
+
 /*
  * struct util_filter_ctx - control and callbacks for util_filter_walk()
  * ->filter_bus() and ->filter_region() return bool because the
@@ -75,6 +80,7 @@ struct util_filter_ctx {
 		void *arg;
 		struct list_filter_arg *list;
 		struct nsaction_filter_arg *nsaction;
+		struct rgaction_filter_arg *rgaction;
 	};
 };
 

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