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ext4srv: generate a uuid when doing mkfs; don't journal ext2

--- a/sys/src/cmd/ext4srv/part.c

+++ b/sys/src/cmd/ext4srv/part.c

@@ -268,10 +268,11 @@

 	struct ext4_mkfs_info info;

 	struct ext4_fs fs;

 	u32int blksz;

+	ulong rn;

+	int f, i;

 	Part *p;

 	char *s;

 	Dir *d;

-	int f;

 	d = nil;

 	p = nil;

@@ -313,7 +314,11 @@

 			snprint(info.label, sizeof(info.label), opts->label);

 			info.inode_size = opts->inodesz;

 			info.inodes = opts->ninode;

-			info.journal = true;

+			info.journal = opts->fstype > 2;

+			for(i = 0; i < 16; i += 4){

+				rn = truerand();

+				memcpy(info.uuid+i, &rn, 4);

+			}

 			if(ext4_mkfs(&fs, &p->bdev, &info, opts->fstype) < 0){

 				werrstr("mkfs: %r");

 				goto error;