From 82b97cbea5d5cee83d7dadc4b8582f7bbab16b22 Mon Sep 17 00:00:00 2001
From: Gilles Grandou <gilles@grandou.net>
Date: Thu, 11 Nov 2010 03:00:18 +0100
Subject: [PATCH 2/5] add cmdpart= boot parameter in place of partition table

---
 fs/partitions/Kconfig   |    6 ++++
 fs/partitions/Makefile  |    1 +
 fs/partitions/check.c   |    4 ++
 fs/partitions/cmdline.c |   73 +++++++++++++++++++++++++++++++++++++++++++++++
 fs/partitions/cmdline.h |    1 +
 5 files changed, 85 insertions(+), 0 deletions(-)
 create mode 100644 fs/partitions/cmdline.c
 create mode 100644 fs/partitions/cmdline.h

diff --git a/fs/partitions/Kconfig b/fs/partitions/Kconfig
index cb5f0a3..c7a398d 100644
--- a/fs/partitions/Kconfig
+++ b/fs/partitions/Kconfig
@@ -249,3 +249,9 @@ config SYSV68_PARTITION
 	  partition table format used by Motorola Delta machines (using
 	  sysv68).
 	  Otherwise, say N.
+
+config CMDLINE_PARTITION
+	bool "Cmdline partition table support" if PARTITION_ADVANCED
+	default n
+	help
+	  Pass partition table via cmdline
diff --git a/fs/partitions/Makefile b/fs/partitions/Makefile
index 03af8ea..11e3a89 100644
--- a/fs/partitions/Makefile
+++ b/fs/partitions/Makefile
@@ -18,3 +18,4 @@ obj-$(CONFIG_IBM_PARTITION) += ibm.o
 obj-$(CONFIG_EFI_PARTITION) += efi.o
 obj-$(CONFIG_KARMA_PARTITION) += karma.o
 obj-$(CONFIG_SYSV68_PARTITION) += sysv68.o
+obj-$(CONFIG_CMDLINE_PARTITION) += cmdline.o
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index 7452408..9834042 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -32,6 +32,7 @@
 #include "sgi.h"
 #include "sun.h"
 #include "ibm.h"
+#include "cmdline.h"
 #include "ultrix.h"
 #include "efi.h"
 #include "karma.h"
@@ -104,6 +105,9 @@ static int (*check_part[])(struct parsed_partitions *, struct block_device *) =
 #ifdef CONFIG_IBM_PARTITION
 	ibm_partition,
 #endif
+#ifdef CONFIG_CMDLINE_PARTITION
+	cmdline_partition,
+#endif
 #ifdef CONFIG_KARMA_PARTITION
 	karma_partition,
 #endif
diff --git a/fs/partitions/cmdline.c b/fs/partitions/cmdline.c
new file mode 100644
index 0000000..1495653
--- /dev/null
+++ b/fs/partitions/cmdline.c
@@ -0,0 +1,73 @@
+#include <linux/init.h>
+#include <linux/kernel.h>
+
+#include "check.h"
+#include "cmdline.h"
+
+const char *partition_list = NULL;
+static short set = 0;
+
+#define STATE_NUM 0
+#define STATE_START 1
+#define STATE_SIZE 2
+
+
+/*
+ */
+int
+cmdline_partition(struct parsed_partitions *state, struct block_device *bdev)
+{
+
+        if (state->parts[0].size)
+          return;
+
+	int blocksize, res;
+	char *ptr = partition_list;
+	char *pstart = ptr;
+	short parse_state = STATE_NUM;
+	int conf[STATE_SIZE];
+
+
+        res = 0;
+	blocksize = bdev_hardsect_size(bdev);
+	if (blocksize <= 0)
+		goto out_exit;
+
+        res = 1;
+
+	do {
+
+	ptr++;
+	switch (*ptr) {
+		case ':':
+		case 0:
+		case ',':
+		conf[parse_state]=simple_strtol(pstart, NULL, 0);
+
+		if(parse_state == STATE_SIZE) {
+			parse_state = STATE_NUM;
+			put_partition(state, conf[0], conf[1], conf[2]);
+		} else {
+			parse_state ++;
+		}
+
+		if(*ptr)
+			pstart = ++ptr;
+
+	    }
+	} while (*ptr);
+
+out_exit:
+	return res;
+}
+
+static int __init partition_setup(char *options) {
+    printk(KERN_INFO "partition setup %x\n", options);
+
+    if (options && *options && !partition_list)
+        partition_list = options;
+
+    return 0;
+
+}
+__setup("cmdpart=", partition_setup);
diff --git a/fs/partitions/cmdline.h b/fs/partitions/cmdline.h
new file mode 100644
index 0000000..c753deb
--- /dev/null
+++ b/fs/partitions/cmdline.h
@@ -0,0 +1 @@
+int cmdline_partition(struct parsed_partitions *, struct block_device *);
-- 
1.7.1