bcacheadm: set disk-failed command

Given a cacheset uuid and a device uuid, set that devices
member_info to CACHE_FAILED.

Change-Id: Ideb2034b1deb5fd11efda67f85b82d8a49fe71e4
Signed-off-by: Jacob Malevich <jam@daterainc.com>

bcache.c

@@ -1236,6 +1236,36 @@ err:
 	return err;
 }
 
+char *device_set_failed(const char *dev_uuid, const char *set_uuid) {
+	int ret, bcachefd;
+	char *err = NULL;
+	uuid_le dev, set;
+	struct bch_ioctl_disk_failed df;
+
+	bcachefd = open("/dev/bcache", O_RDWR);
+	if (bcachefd < 0) {
+		err = "Can't open bcache device";
+		goto err;
+	}
+
+	uuid_parse(dev_uuid, dev.b);
+	uuid_parse(set_uuid, set.b);
+	df.dev_uuid = dev;
+	df.set_uuid = set;
+
+	ret = ioctl(bcachefd, BCH_IOCTL_SET_DISK_FAILED, &df);
+	if (ret < 0) {
+		char tmp[128];
+		snprintf(tmp, 128, "ioctl set disk failed error %s\n",
+				strerror(ret));
+		err = strdup(tmp);
+	}
+
+err:
+	close(bcachefd);
+	return err;
+}
+
 char *probe(char *dev, int udev)
 {
 	struct cache_sb sb;

bcache.h

@@ -110,7 +110,7 @@ char *add_devices(char *const *, char *);
 char *remove_device(const char *, bool);
 char *bcache_get_capacity(const char *, const char *, bool);
 char *dev_name(const char *);
-
+char *device_set_failed(const char *dev_uuid, const char *set_uuid);
 
 #define csum_set(i, type)						\
 ({									\

bcacheadm.c

@@ -99,6 +99,10 @@ bool stats_hour = false;
 bool stats_day = false;
 bool stats_total = false;
 
+/* set_failed globals */
+static const char *failed_uuid = NULL;
+static const char *dev_failed_uuid = NULL;
+
 /* make-bcache option setters */
 static int set_block_size(NihOption *option, const char *arg)
 {
@@ -254,6 +258,12 @@ static NihOption stats_options[] = {
 	NIH_OPTION_LAST
 };
 
+static NihOption set_failed_options[] = {
+	{'u', "set", N_("cache_set UUID"), NULL, "UUID", &failed_uuid, NULL},
+	{'d', "dev", N_("dev UUID"), NULL, "UUID", &dev_failed_uuid, NULL},
+	NIH_OPTION_LAST
+};
+
 static NihOption options[] = {
 	NIH_OPTION_LAST
 };
@@ -784,6 +794,30 @@ err:
 	return -1;
 }
 
+int bcache_set_failed(NihCommand *command, char *const *args)
+{
+	int i;
+	char *err = NULL;
+
+	if (!failed_uuid) {
+		printf("Pass in a cacheset uuid\n");
+		return -1;
+	}
+
+	if (!dev_failed_uuid) {
+		printf("Pass in a dev uuid\n");
+		return -1;
+	}
+
+	err = device_set_failed(dev_failed_uuid, failed_uuid);
+	if (err) {
+		printf("bcache_set_failed_ioctl error: %s\n", err);
+		return -1;
+	}
+
+	return 0;
+}
+
 static NihCommand commands[] = {
 	{"format", N_("format <list of drives>"),
 		  "Format one or a list of devices with bcache datastructures."
@@ -834,6 +868,10 @@ static NihCommand commands[] = {
 		  "List various bcache statistics",
 		  N_("List various bcache statistics"),
 		  NULL, stats_options, bcache_stats},
+	{"set-failed", N_("set-failed --set=UUID --dev=UUID"),
+		"Sets a device to the FAILED state",
+		N_("Sets a device to the FAILED state"),
+		NULL, set_failed_options, bcache_set_failed},
 	NIH_COMMAND_LAST
 };