block-dev-stats: Test tool for ongoing ata rewrite

apps/block-dev-stats.c

@@ -0,0 +1,32 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <sys/ioctl.h>
+
+int main(int argc, char * argv[]) {
+	if (argc < 2) return 1;
+
+	int fd = open(argv[1],O_RDONLY);
+
+	if (fd < 0) {
+		fprintf(stderr, "open: %d\n", fd);
+		return 2;
+	}
+
+	uint64_t stats[4] = {-1};
+
+	long res = ioctl(fd, 0x2A01234UL, &stats);
+
+	if (res < 0) {
+		fprintf(stderr, "ioctl: %ld\n", res);
+		return 3;
+	}
+
+	fprintf(stderr, "hits:\t%zu\n", stats[0]);
+	fprintf(stderr, "misses:\t%zu\n", stats[1]);
+	fprintf(stderr, "evicts:\t%zu\n", stats[2]);
+	fprintf(stderr, "writes:\t%zu\n", stats[3]);
+
+	return 0;
+}