[PATCH] use cramfs as an initrd

Now that Al Viro fixed cramfs, it works beautifully as an initrd
filesystem.

So finally plumb it in.

init/do_mounts_rd.c

@@ -4,6 +4,7 @@
 #include <linux/minix_fs.h>
 #include <linux/ext2_fs.h>
 #include <linux/romfs_fs.h>
+#include <linux/cramfs_fs.h>
 #include <linux/initrd.h>
 #include <linux/string.h>
 
@@ -41,6 +42,7 @@ static int __init crd_load(int in_fd, int out_fd);
  * 	minix
  * 	ext2
  *	romfs
+ *	cramfs
  * 	gzip
  */
 static int __init 
@@ -50,6 +52,7 @@ identify_ramdisk_image(int fd, int start_block)
 	struct minix_super_block *minixsb;
 	struct ext2_super_block *ext2sb;
 	struct romfs_super_block *romfsb;
+	struct cramfs_super *cramfsb;
 	int nblocks = -1;
 	unsigned char *buf;
 
@@ -60,6 +63,7 @@ identify_ramdisk_image(int fd, int start_block)
 	minixsb = (struct minix_super_block *) buf;
 	ext2sb = (struct ext2_super_block *) buf;
 	romfsb = (struct romfs_super_block *) buf;
+	cramfsb = (struct cramfs_super *) buf;
 	memset(buf, 0xe5, size);
 
 	/*
@@ -89,6 +93,14 @@ identify_ramdisk_image(int fd, int start_block)
 		goto done;
 	}
 
+	if (cramfsb->magic == CRAMFS_MAGIC) {
+		printk(KERN_NOTICE
+		       "RAMDISK: cramfs filesystem found at block %d\n",
+		       start_block);
+		nblocks = (cramfsb->size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
+		goto done;
+	}
+
 	/*
 	 * Read block 1 to test for minix and ext2 superblock
 	 */