Support mounted boot partitions in the installer. This allows the platform

layer, for example, to specify that the EFI boot partition should be
mounted at /efi and formatted normally with newfs_msdos rather than
splatted to from /boot/boot1.efifat.

This commit adds only the API for this; actual platform use will come later.

usr.sbin/bsdinstall/partedit/gpart_ops.c

@@ -191,9 +191,7 @@ newfs_command(const char *fstype, char *command, int use_default)
 		for (i = 0; i < (int)nitems(items); i++) {
 			if (items[i].state == 0)
 				continue;
-			if (strcmp(items[i].name, "FAT32") == 0)
-				strcat(command, "-F 32 ");
-			else if (strcmp(items[i].name, "FAT16") == 0)
+			if (strcmp(items[i].name, "FAT16") == 0)
 				strcat(command, "-F 16 ");
 			else if (strcmp(items[i].name, "FAT12") == 0)
 				strcat(command, "-F 12 ");
@@ -675,6 +673,7 @@ set_default_part_metadata(const char *name, const char *scheme,
 {
 	struct partition_metadata *md;
 	char *zpool_name = NULL;
+	const char *default_bootmount = NULL;
 	int i;
 
 	/* Set part metadata */
@@ -705,8 +704,12 @@ set_default_part_metadata(const char *name, const char *scheme,
 
 	if (strcmp(type, "freebsd-swap") == 0)
 		mountpoint = "none";
-	if (strcmp(type, bootpart_type(scheme)) == 0)
-		md->bootcode = 1;
+	if (strcmp(type, bootpart_type(scheme, &default_bootmount)) == 0) {
+		if (default_bootmount == NULL)
+			md->bootcode = 1;
+		else if (mountpoint == NULL || strlen(mountpoint) == 0)
+			mountpoint = default_bootmount;
+	}
 
 	/* VTOC8 needs partcode at the start of partitions */
 	if (strcmp(scheme, "VTOC8") == 0 && (strcmp(type, "freebsd-ufs") == 0
@@ -886,9 +889,79 @@ gpart_max_free(struct ggeom *geom, intmax_t *npartstart)
 	return (maxsize);
 }
 
+static size_t
+add_boot_partition(struct ggeom *geom, struct gprovider *pp,
+    const char *scheme, int interactive)
+{
+	struct gconfig *gc;
+	struct gprovider *ppi;
+	int choice;
+
+	/* Check for existing freebsd-boot partition */
+	LIST_FOREACH(ppi, &geom->lg_provider, lg_provider) {
+		struct partition_metadata *md;
+		const char *bootmount = NULL;
+
+		LIST_FOREACH(gc, &ppi->lg_config, lg_config)
+			if (strcmp(gc->lg_name, "type") == 0)
+				break;
+		if (gc == NULL)
+			continue;
+		if (strcmp(gc->lg_val, bootpart_type(scheme, &bootmount)) != 0)
+			continue;
+
+		/*
+		 * If the boot partition is not mountable and needs partcode,
+		 * but doesn't have it, it doesn't satisfy our requirements.
+		 */
+		md = get_part_metadata(ppi->lg_name, 0);
+		if (bootmount == NULL && (md == NULL || !md->bootcode))
+			continue;
+
+		/* If it is mountable, but mounted somewhere else, remount */
+		if (bootmount != NULL && md != NULL && md->fstab != NULL
+		    && strlen(md->fstab->fs_file) > 0
+		    && strcmp(md->fstab->fs_file, bootmount) != 0)
+			continue;
+
+		/* If it is mountable, but mountpoint is not set, mount it */
+		if (bootmount != NULL && md == NULL)
+			set_default_part_metadata(ppi->lg_name, scheme,
+			    gc->lg_val, bootmount, NULL);
+		
+		/* Looks good at this point, no added data needed */
+		return (0);
+	}
+
+	if (interactive)
+		choice = dialog_yesno("Boot Partition",
+		    "This partition scheme requires a boot partition "
+		    "for the disk to be bootable. Would you like to "
+		    "make one now?", 0, 0);
+	else
+		choice = 0;
+
+	if (choice == 0) { /* yes */
+		const char *bootmount = NULL;
+		char sizestr[7];
+
+		humanize_number(sizestr, 7,
+		    bootpart_size(scheme), "B", HN_AUTOSCALE,
+		    HN_NOSPACE | HN_DECIMAL);
+
+		gpart_create(pp, bootpart_type(scheme, &bootmount),
+		    sizestr, bootmount, NULL, 0);
+
+		return (bootpart_size(scheme));
+	}
+	
+	return (0);
+}
+
 void
-gpart_create(struct gprovider *pp, char *default_type, char *default_size,
-     char *default_mountpoint, char **partname, int interactive)
+gpart_create(struct gprovider *pp, const char *default_type,
+    const char *default_size, const char *default_mountpoint,
+    char **partname, int interactive)
 {
 	struct gctl_req *r;
 	struct gconfig *gc;
@@ -984,11 +1057,11 @@ gpart_create(struct gprovider *pp, char *default_type, char *default_size,
 	nitems = scheme_supports_labels(scheme) ? 4 : 3;
 
 	if (default_type != NULL)
-		items[0].text = default_type;
+		items[0].text = (char *)default_type;
 	if (default_size != NULL)
-		items[1].text = default_size;
+		items[1].text = (char *)default_size;
 	if (default_mountpoint != NULL)
-		items[2].text = default_mountpoint;
+		items[2].text = (char *)default_mountpoint;
 
 	/* Default options */
 	strncpy(options_fstype, items[0].text,
@@ -1105,61 +1178,21 @@ gpart_create(struct gprovider *pp, char *default_type, char *default_size,
 	 * the user to add one.
 	 */
 
-	/* Check for existing freebsd-boot partition */
-	LIST_FOREACH(pp, &geom->lg_provider, lg_provider) {
-		struct partition_metadata *md;
-		md = get_part_metadata(pp->lg_name, 0);
-		if (md == NULL || !md->bootcode)
-			continue;
-		LIST_FOREACH(gc, &pp->lg_config, lg_config)
-			if (strcmp(gc->lg_name, "type") == 0)
-				break;
-		if (gc != NULL && strcmp(gc->lg_val,
-		    bootpart_type(scheme)) == 0)
-			break;
-	}
-
-	/* If there isn't one, and we need one, ask */
 	if ((strcmp(items[0].text, "freebsd") == 0 ||
-	    strcmp(items[2].text, "/") == 0) && bootpart_size(scheme) > 0 &&
-	    pp == NULL) {
-		if (interactive)
-			choice = dialog_yesno("Boot Partition",
-			    "This partition scheme requires a boot partition "
-			    "for the disk to be bootable. Would you like to "
-			    "make one now?", 0, 0);
-		else
-			choice = 0;
+	    strcmp(items[2].text, "/") == 0) && bootpart_size(scheme) > 0) {
+		size_t bytes = add_boot_partition(geom, pp, scheme,
+		    interactive);
 
-		if (choice == 0) { /* yes */
-			r = gctl_get_handle();
-			gctl_ro_param(r, "class", -1, "PART");
-			gctl_ro_param(r, "arg0", -1, geom->lg_name);
-			gctl_ro_param(r, "flags", -1, GPART_FLAGS);
-			gctl_ro_param(r, "verb", -1, "add");
-			gctl_ro_param(r, "type", -1, bootpart_type(scheme));
-			snprintf(sizestr, sizeof(sizestr), "%jd",
-			    bootpart_size(scheme) / sector);
-			gctl_ro_param(r, "size", -1, sizestr);
-			snprintf(startstr, sizeof(startstr), "%jd", firstfree);
-			gctl_ro_param(r, "start", -1, startstr);
-			gctl_rw_param(r, "output", sizeof(output), output);
-			errstr = gctl_issue(r);
-			if (errstr != NULL && errstr[0] != '\0') 
-				gpart_show_error("Error", NULL, errstr);
-			gctl_free(r);
-
-			get_part_metadata(strtok(output, " "), 1)->bootcode = 1;
-
-			/* Now adjust the part we are really adding forward */
-			firstfree += bootpart_size(scheme) / sector;
-			size -= (bootpart_size(scheme) + stripe)/sector;
+		/* Now adjust the part we are really adding forward */
+		if (bytes > 0) {
+			firstfree += bytes / sector;
+			size -= (bytes + stripe)/sector;
 			if (stripe > 0 && (firstfree*sector % stripe) != 0) 
 				firstfree += (stripe - ((firstfree*sector) %
 				    stripe)) / sector;
 		}
 	}
-	
+
 	r = gctl_get_handle();
 	gctl_ro_param(r, "class", -1, "PART");
 	gctl_ro_param(r, "arg0", -1, geom->lg_name);
@@ -1197,9 +1230,8 @@ gpart_create(struct gprovider *pp, char *default_type, char *default_size,
 	gctl_issue(r); /* Error usually expected and non-fatal */
 	gctl_free(r);
 
-	if (strcmp(items[0].text, bootpart_type(scheme)) == 0)
-		get_part_metadata(newpartname, 1)->bootcode = 1;
-	else if (strcmp(items[0].text, "freebsd") == 0)
+
+	if (strcmp(items[0].text, "freebsd") == 0)
 		gpart_partition(newpartname, "BSD");
 	else
 		set_default_part_metadata(newpartname, scheme,

usr.sbin/bsdinstall/partedit/partedit.h

@@ -65,8 +65,9 @@ int wizard_makeparts(struct gmesh *mesh, const char *disk, const char *fstype,
 void gpart_delete(struct gprovider *pp);
 void gpart_destroy(struct ggeom *lg_geom);
 void gpart_edit(struct gprovider *pp);
-void gpart_create(struct gprovider *pp, char *default_type, char *default_size,
-    char *default_mountpoint, char **output, int interactive);
+void gpart_create(struct gprovider *pp, const char *default_type,
+    const char *default_size, const char *default_mountpoint,
+    char **output, int interactive);
 intmax_t gpart_max_free(struct ggeom *gp, intmax_t *start);
 void gpart_revert(struct gprovider *pp);
 void gpart_revert_all(struct gmesh *mesh);
@@ -78,12 +79,29 @@ void gpart_set_root(const char *lg_name, const char *attribute);
 const char *choose_part_type(const char *def_scheme);
 
 /* machine-dependent bootability checks */
-const char *default_scheme(void);
-int is_scheme_bootable(const char *scheme);
-int is_fs_bootable(const char *scheme, const char *fs);
+const char *default_scheme(void);		/* Default partition scheme */
+int is_scheme_bootable(const char *scheme);	/* Non-zero if scheme boots */
+int is_fs_bootable(const char *scheme, const char *fs); /* Ditto if FS boots */
+
+/* Size of boot partition in bytes. Zero if no boot partition */
 size_t bootpart_size(const char *scheme);
-const char *bootpart_type(const char *scheme);
+
+/*
+ * Type and mountpoint of boot partition for given scheme. If boot partition
+ * should not be mounted, set mountpoint to NULL or leave it unchanged.
+ * Note that mountpoint non-NULL implies partcode_path() will be ignored.
+ * Do *NOT* set both!
+ */
+const char *bootpart_type(const char *scheme, const char **mountpoint);
+
+/* Path to bootcode that goes in the scheme (e.g. disk MBR). NULL if none */
 const char *bootcode_path(const char *scheme);
+
+/*
+ * Path to boot blocks to be dd'ed into the partition suggested by bootpart_*
+ * for the given scheme and root filesystem type. If the boot partition should
+ * be mounted rather than dd'ed to, return NULL here.
+ */
 const char *partcode_path(const char *scheme, const char *fs_type);
 
 #endif

usr.sbin/bsdinstall/partedit/partedit_arm64.c

@@ -77,7 +77,7 @@ bootpart_size(const char *scheme)
 }
 
 const char *
-bootpart_type(const char *scheme)
+bootpart_type(const char *scheme, const char **mountpoint)
 {
 
 	/* Only EFI is supported as boot partition */

usr.sbin/bsdinstall/partedit/partedit_generic.c

@@ -65,7 +65,7 @@ bootpart_size(const char *part_type) {
 }
 
 const char *
-bootpart_type(const char *scheme) {
+bootpart_type(const char *scheme, const char **mountpoint) {
 	return ("freebsd-boot");
 }
 

usr.sbin/bsdinstall/partedit/partedit_powerpc.c

@@ -92,7 +92,7 @@ bootpart_size(const char *part_type) {
 }
 
 const char *
-bootpart_type(const char *scheme) {
+bootpart_type(const char *scheme, const char **mountpoint) {
 	size_t platlen = sizeof(platform);
 	if (strlen(platform) == 0)
 		sysctlbyname("hw.platform", platform, &platlen, NULL, -1);

usr.sbin/bsdinstall/partedit/partedit_sparc64.c

@@ -61,7 +61,7 @@ bootpart_size(const char *part_type) {
 }
 
 const char *
-bootpart_type(const char *scheme) {
+bootpart_type(const char *scheme, const char **mountpoint) {
 	return ("freebsd-boot");
 }
 

usr.sbin/bsdinstall/partedit/partedit_x86.c

@@ -111,7 +111,7 @@ bootpart_size(const char *scheme)
 }
 
 const char *
-bootpart_type(const char *scheme)
+bootpart_type(const char *scheme, const char **mountpoint)
 {
 
 	if (strcmp(x86_bootmethod(), "UEFI") == 0)