Change char* to enum in context->update & refactor code

Storing update option in string is bad for frequent comparisons and
error prone.
Replace char array with enum so already existing enum is passed around
instead of string.
Adapt code to changes.

Signed-off-by: Mateusz Kusiak <mateusz.kusiak@intel.com>
Signed-off-by: Jes Sorensen <jes@trained-monkey.org>

3 files changed, 37 insertions, 57 deletions

diff --git a/Assemble.c b/Assemble.c
index dba910c..4980494 100644
--- a/Assemble.c
+++ b/Assemble.c
@@ -135,17 +135,17 @@ static int ident_matches(struct mddev_ident *ident,
 			 struct mdinfo *content,
 			 struct supertype *tst,
 			 char *homehost, int require_homehost,
-			 char *update, char *devname)
+			 enum update_opt update, char *devname)
 {
 
-	if (ident->uuid_set && (!update || strcmp(update, "uuid")!= 0) &&
+	if (ident->uuid_set && update != UOPT_UUID &&
 	    same_uuid(content->uuid, ident->uuid, tst->ss->swapuuid)==0 &&
 	    memcmp(content->uuid, uuid_zero, sizeof(int[4])) != 0) {
 		if (devname)
 			pr_err("%s has wrong uuid.\n", devname);
 		return 0;
 	}
-	if (ident->name[0] && (!update || strcmp(update, "name")!= 0) &&
+	if (ident->name[0] && update != UOPT_NAME &&
 	    name_matches(content->name, ident->name, homehost, require_homehost)==0) {
 		if (devname)
 			pr_err("%s has wrong name.\n", devname);
@@ -648,11 +648,10 @@ static int load_devices(struct devs *devices, char *devmap,
 			int err;
 			fstat(mdfd, &stb2);
 
-			if (strcmp(c->update, "uuid") == 0 && !ident->uuid_set)
+			if (c->update == UOPT_UUID && !ident->uuid_set)
 				random_uuid((__u8 *)ident->uuid);
 
-			if (strcmp(c->update, "ppl") == 0 &&
-			    ident->bitmap_fd >= 0) {
+			if (c->update == UOPT_PPL && ident->bitmap_fd >= 0) {
 				pr_err("PPL is not compatible with bitmap\n");
 				close(mdfd);
 				free(devices);
@@ -684,34 +683,30 @@ static int load_devices(struct devs *devices, char *devmap,
 			strcpy(content->name, ident->name);
 			content->array.md_minor = minor(stb2.st_rdev);
 
-			if (strcmp(c->update, "byteorder") == 0)
+			if (c->update == UOPT_BYTEORDER)
 				err = 0;
-			else if (strcmp(c->update, "home-cluster") == 0) {
+			else if (c->update == UOPT_HOME_CLUSTER) {
 				tst->cluster_name = c->homecluster;
 				err = tst->ss->write_bitmap(tst, dfd, NameUpdate);
-			} else if (strcmp(c->update, "nodes") == 0) {
+			} else if (c->update == UOPT_NODES) {
 				tst->nodes = c->nodes;
 				err = tst->ss->write_bitmap(tst, dfd, NodeNumUpdate);
-			} else if (strcmp(c->update, "revert-reshape") == 0 &&
-				   c->invalid_backup)
+			} else if (c->update == UOPT_REVERT_RESHAPE && c->invalid_backup)
 				err = tst->ss->update_super(tst, content,
 							    UOPT_SPEC_REVERT_RESHAPE_NOBACKUP,
 							    devname, c->verbose,
 							    ident->uuid_set,
 							    c->homehost);
 			else
-				/*
-				 * Mapping is temporary, will be removed in this patchset
-				 */
 				err = tst->ss->update_super(tst, content,
-							    map_name(update_options, c->update),
+							    c->update,
 							    devname, c->verbose,
 							    ident->uuid_set,
 							    c->homehost);
 			if (err < 0) {
 				if (err == -1)
 					pr_err("--update=%s not understood for %s metadata\n",
-					       c->update, tst->ss->name);
+					       map_num(update_options, c->update), tst->ss->name);
 				tst->ss->free_super(tst);
 				free(tst);
 				close(mdfd);
@@ -721,7 +716,7 @@ static int load_devices(struct devs *devices, char *devmap,
 				*stp = st;
 				return -1;
 			}
-			if (strcmp(c->update, "uuid")==0 &&
+			if (c->update == UOPT_UUID &&
 			    !ident->uuid_set) {
 				ident->uuid_set = 1;
 				memcpy(ident->uuid, content->uuid, 16);
@@ -730,7 +725,7 @@ static int load_devices(struct devs *devices, char *devmap,
 				pr_err("Could not re-write superblock on %s.\n",
 				       devname);
 
-			if (strcmp(c->update, "uuid")==0 &&
+			if (c->update == UOPT_UUID &&
 			    ident->bitmap_fd >= 0 && !bitmap_done) {
 				if (bitmap_update_uuid(ident->bitmap_fd,
 						       content->uuid,
@@ -1188,8 +1183,7 @@ static int start_array(int mdfd,
 				pr_err("%s: Need a backup file to complete reshape of this array.\n",
 				       mddev);
 				pr_err("Please provided one with \"--backup-file=...\"\n");
-				if (c->update &&
-				    strcmp(c->update, "revert-reshape") == 0)
+				if (c->update == UOPT_REVERT_RESHAPE)
 					pr_err("(Don't specify --update=revert-reshape again, that part succeeded.)\n");
 				return 1;
 			}
@@ -1487,7 +1481,7 @@ try_again:
 	 */
 	if (map_lock(&map))
 		pr_err("failed to get exclusive lock on mapfile - continue anyway...\n");
-	if (c->update && strcmp(c->update,"uuid") == 0)
+	if (c->update == UOPT_UUID)
 		mp = NULL;
 	else
 		mp = map_by_uuid(&map, content->uuid);
@@ -1634,7 +1628,7 @@ try_again:
 		goto out;
 	}
 
-	if (c->update && strcmp(c->update, "byteorder")==0)
+	if (c->update == UOPT_BYTEORDER)
 		st->minor_version = 90;
 
 	st->ss->getinfo_super(st, content, NULL);
@@ -1902,7 +1896,7 @@ try_again:
 	/* First, fill in the map, so that udev can find our name
 	 * as soon as we become active.
 	 */
-	if (c->update && strcmp(c->update, "metadata")==0) {
+	if (c->update == UOPT_METADATA) {
 		content->array.major_version = 1;
 		content->array.minor_version = 0;
 		strcpy(content->text_version, "1.0");
diff --git a/mdadm.c b/mdadm.c
index d06e282..57e8e6f 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -724,13 +724,12 @@ int main(int argc, char *argv[])
 
 		case O(ASSEMBLE,'U'): /* update the superblock */
 		case O(MISC,'U'): {
-			enum update_opt updateopt = map_name(update_options, c.update);
 			enum update_opt print_mode = UOPT_HELP;
 			const char *error_addon = "update option";
 
 			if (c.update) {
 				pr_err("Can only update one aspect of superblock, both %s and %s given.\n",
-					c.update, optarg);
+					map_num(update_options, c.update), optarg);
 				exit(2);
 			}
 			if (mode == MISC && !c.subarray) {
@@ -738,20 +737,20 @@ int main(int argc, char *argv[])
 				exit(2);
 			}
 
-			c.update = optarg;
+			c.update = map_name(update_options, optarg);
 
 			if (devmode == UpdateSubarray) {
 				print_mode = UOPT_SUBARRAY_ONLY;
 				error_addon = "update-subarray option";
 
-				if (updateopt > UOPT_SUBARRAY_ONLY && updateopt < UOPT_HELP)
-					updateopt = UOPT_UNDEFINED;
+				if (c.update > UOPT_SUBARRAY_ONLY && c.update < UOPT_HELP)
+					c.update = UOPT_UNDEFINED;
 			}
 
-			switch (updateopt) {
+			switch (c.update) {
 			case UOPT_UNDEFINED:
 				pr_err("'--update=%s' is invalid %s. ",
-					c.update, error_addon);
+					optarg, error_addon);
 				outf = stderr;
 			case UOPT_HELP:
 				if (!outf)
@@ -776,14 +775,14 @@ int main(int argc, char *argv[])
 			}
 			if (c.update) {
 				pr_err("Can only update one aspect of superblock, both %s and %s given.\n",
-					c.update, optarg);
+					map_num(update_options, c.update), optarg);
 				exit(2);
 			}
-			c.update = optarg;
-			if (strcmp(c.update, "devicesize") != 0 &&
-			    strcmp(c.update, "bbl") != 0 &&
-			    strcmp(c.update, "force-no-bbl") != 0 &&
-			    strcmp(c.update, "no-bbl") != 0) {
+			c.update = map_name(update_options, optarg);
+			if (c.update != UOPT_DEVICESIZE &&
+			    c.update != UOPT_BBL &&
+			    c.update != UOPT_NO_BBL &&
+			    c.update != UOPT_FORCE_NO_BBL) {
 				pr_err("only 'devicesize', 'bbl', 'no-bbl', and 'force-no-bbl' can be updated with --re-add\n");
 				exit(2);
 			}
@@ -1357,7 +1356,7 @@ int main(int argc, char *argv[])
 		}
 	}
 
-	if (c.update && strcmp(c.update, "nodes") == 0 && c.nodes == 0) {
+	if (c.update && c.update == UOPT_NODES && c.nodes == 0) {
 		pr_err("Please specify nodes number with --nodes\n");
 		exit(1);
 	}
@@ -1402,22 +1401,10 @@ int main(int argc, char *argv[])
 		/* readonly, add/remove, readwrite, runstop */
 		if (c.readonly > 0)
 			rv = Manage_ro(devlist->devname, mdfd, c.readonly);
-		if (!rv && devs_found > 1) {
-			/*
-			 * This is temporary and will be removed in next patches
-			 * Null c.update will cause segfault
-			 */
-			if (c.update)
-				rv = Manage_subdevs(devlist->devname, mdfd,
-						devlist->next, c.verbose, c.test,
-						map_name(update_options, c.update),
-						c.force);
-			else
-				rv = Manage_subdevs(devlist->devname, mdfd,
-						devlist->next, c.verbose, c.test,
-						UOPT_UNDEFINED,
-						c.force);
-		}
+		if (!rv && devs_found > 1)
+			rv = Manage_subdevs(devlist->devname, mdfd,
+					    devlist->next, c.verbose,
+					    c.test, c.update, c.force);
 		if (!rv && c.readonly < 0)
 			rv = Manage_ro(devlist->devname, mdfd, c.readonly);
 		if (!rv && c.runstop > 0)
@@ -1937,14 +1924,13 @@ static int misc_list(struct mddev_dev *devlist,
 			rv |= Kill_subarray(dv->devname, c->subarray, c->verbose);
 			continue;
 		case UpdateSubarray:
-			if (c->update == NULL) {
+			if (!c->update) {
 				pr_err("-U/--update must be specified with --update-subarray\n");
 				rv |= 1;
 				continue;
 			}
 			rv |= Update_subarray(dv->devname, c->subarray,
-					      map_name(update_options, c->update),
-					      ident, c->verbose);
+					      c->update, ident, c->verbose);
 			continue;
 		case Dump:
 			rv |= Dump_metadata(dv->devname, dump_directory, c, ss);
diff --git a/mdadm.h b/mdadm.h
index 924f4b6..13f8b4c 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -616,7 +616,7 @@ struct context {
 	int	export;
 	int	test;
 	char	*subarray;
-	char	*update;
+	enum	update_opt update;
 	int	scan;
 	int	SparcAdjust;
 	int	autof;