add generic 2.6.29 patches and config (squashfs still untested, user space mkfs still missing)

SVN-Revision: 15251

1 files changed, 312 insertions, 304 deletions

diff --git a/target/linux/generic-2.6/patches-2.6.29/065-rootfs_split.patch b/target/linux/generic-2.6/patches-2.6.29/065-rootfs_split.patch
index bae9621933..172eb0f19b 100644
--- a/target/linux/generic-2.6/patches-2.6.29/065-rootfs_split.patch
+++ b/target/linux/generic-2.6/patches-2.6.29/065-rootfs_split.patch
@@ -1,7 +1,268 @@
-diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3/drivers/mtd/devices/block2mtd.c
---- linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c	2009-03-09 05:13:51.000000000 +0100
-+++ linux-2.6.29-rc3/drivers/mtd/devices/block2mtd.c	2009-03-09 18:18:49.000000000 +0100
-@@ -28,6 +28,8 @@
+--- a/drivers/mtd/Kconfig
++++ b/drivers/mtd/Kconfig
+@@ -53,6 +53,16 @@ config MTD_TESTS
+ 	  should normally be compiled as kernel modules. The modules perform
+ 	  various checks and verifications when loaded.
+ 
++config MTD_ROOTFS_ROOT_DEV
++	bool "Automatically set 'rootfs' partition to be root filesystem"
++	depends on MTD_PARTITIONS
++	default y
++
++config MTD_ROOTFS_SPLIT
++	bool "Automatically split 'rootfs' partition for squashfs"
++	depends on MTD_PARTITIONS
++	default y
++
+ config MTD_REDBOOT_PARTS
+ 	tristate "RedBoot partition table parsing"
+ 	depends on MTD_PARTITIONS
+--- a/drivers/mtd/mtdpart.c
++++ b/drivers/mtd/mtdpart.c
+@@ -18,6 +18,8 @@
+ #include <linux/mtd/mtd.h>
+ #include <linux/mtd/partitions.h>
+ #include <linux/mtd/compatmac.h>
++#include <linux/root_dev.h>
++#include <linux/magic.h>
+ 
+ /* Our partition linked list */
+ static LIST_HEAD(mtd_partitions);
+@@ -37,7 +39,7 @@ struct mtd_part {
+  * the pointer to that structure with this macro.
+  */
+ #define PART(x)  ((struct mtd_part *)(x))
+-
++#define IS_PART(mtd) (mtd->read == part_read)
+ 
+ /*
+  * MTD methods which simply translate the effective address and pass through
+@@ -489,6 +491,156 @@ out_register:
+ 	return slave;
+ }
+ 
++#ifdef CONFIG_MTD_ROOTFS_SPLIT
++#define ROOTFS_SPLIT_NAME "rootfs_data"
++#define ROOTFS_REMOVED_NAME "<removed>"
++
++struct squashfs_super_block {
++	__le32 s_magic;
++	__le32 pad0[9];
++	__le64 bytes_used;
++};
++
++
++static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
++{
++	char buf[512];
++	struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
++	int len, ret;
++
++	ret = master->read(master, offset, sizeof(*sb), &len, buf);
++	if (ret || (len != sizeof(*sb))) {
++		printk(KERN_ALERT "split_squashfs: error occured while reading "
++			"from \"%s\"\n", master->name);
++		return -EINVAL;
++	}
++
++	if (*((u32 *) buf) != SQUASHFS_MAGIC) {
++		printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
++			master->name);
++		*split_offset = 0;
++		return 0;
++	}
++
++	if (sb->bytes_used <= 0) {
++		printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
++			master->name);
++		*split_offset = 0;
++		return 0;
++	}
++
++	len = (u32) sb->bytes_used;
++	len += (offset & 0x000fffff);
++	len +=  (master->erasesize - 1);
++	len &= ~(master->erasesize - 1);
++	len -= (offset & 0x000fffff);
++	*split_offset = offset + len;
++
++	return 0;
++}
++
++static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part,
++		int index)
++{
++	struct mtd_partition *dpart;
++	struct mtd_part *slave = NULL;
++	int split_offset = 0;
++	int ret;
++
++	ret = split_squashfs(master, part->offset, &split_offset);
++	if (ret)
++		return ret;
++
++	if (split_offset <= 0)
++		return 0;
++
++	dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
++	if (dpart == NULL) {
++		printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
++			ROOTFS_SPLIT_NAME);
++		return -ENOMEM;
++	}
++
++	memcpy(dpart, part, sizeof(*part));
++	dpart->name = (unsigned char *)&dpart[1];
++	strcpy(dpart->name, ROOTFS_SPLIT_NAME);
++
++	dpart->size -= split_offset - dpart->offset;
++	dpart->offset = split_offset;
++
++	if (dpart == NULL)
++		return 1;
++
++	printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%llX, len=%llX \n",
++		ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
++
++	slave = add_one_partition(master, dpart, index, split_offset);
++	if (!slave) {
++		kfree(dpart);
++		return -ENOMEM;
++	}
++	rpart->split = &slave->mtd;
++
++	return 0;
++}
++
++static int refresh_rootfs_split(struct mtd_info *mtd)
++{
++	struct mtd_partition tpart;
++	struct mtd_part *part;
++	char *name;
++	int index = 0;
++	int offset, size;
++	int ret;
++
++	part = PART(mtd);
++
++	/* check for the new squashfs offset first */
++	ret = split_squashfs(part->master, part->offset, &offset);
++	if (ret)
++		return ret;
++
++	if ((offset > 0) && !mtd->split) {
++		printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
++		/* if we don't have a rootfs split partition, create a new one */
++		tpart.name = (char *) mtd->name;
++		tpart.size = mtd->size;
++		tpart.offset = part->offset;
++
++		/* find the index of the last partition */
++		if (!list_empty(&mtd_partitions))
++			index = list_first_entry(&mtd_partitions, struct mtd_part, list)->index + 1;
++
++		return split_rootfs_data(part->master, &part->mtd, &tpart, index);
++	} else if ((offset > 0) && mtd->split) {
++		/* update the offsets of the existing partition */
++		size = mtd->size + part->offset - offset;
++
++		part = PART(mtd->split);
++		part->offset = offset;
++		part->mtd.size = size;
++		printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
++			__func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
++			(u32) part->offset, (u32) part->mtd.size);
++		name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
++		strcpy(name, ROOTFS_SPLIT_NAME);
++		part->mtd.name = name;
++	} else if ((offset <= 0) && mtd->split) {
++		printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
++
++		/* mark existing partition as removed */
++		part = PART(mtd->split);
++		name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
++		strcpy(name, ROOTFS_REMOVED_NAME);
++		part->mtd.name = name;
++		part->offset = 0;
++		part->mtd.size = 0;
++	}
++
++	return 0;
++}
++#endif /* CONFIG_MTD_ROOTFS_SPLIT */
++
+ /*
+  * This function, given a master MTD object and a partition table, creates
+  * and registers slave MTD objects which are bound to the master according to
+@@ -502,14 +654,29 @@ int add_mtd_partitions(struct mtd_info *
+ {
+ 	struct mtd_part *slave;
+ 	uint64_t cur_offset = 0;
+-	int i;
++	int i, j, ret;
+ 
+ 	printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
+ 
+-	for (i = 0; i < nbparts; i++) {
+-		slave = add_one_partition(master, parts + i, i, cur_offset);
++	for (i = 0, j = 0; i < nbparts; i++) {
++		slave = add_one_partition(master, parts + i, j++, cur_offset);
+ 		if (!slave)
+ 			return -ENOMEM;
++
++		if (!strcmp(parts[i].name, "rootfs") && slave->registered) {
++#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
++			if (ROOT_DEV == 0) {
++				printk(KERN_NOTICE "mtd: partition \"rootfs\" "
++					"set to be root filesystem\n");
++				ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
++			}
++#endif
++#ifdef CONFIG_MTD_ROOTFS_SPLIT
++			ret = split_rootfs_data(master, &slave->mtd, &parts[i], j);
++			if (ret == 0)
++				j++;
++#endif
++		}
+ 		cur_offset = slave->offset + slave->mtd.size;
+ 	}
+ 
+@@ -517,6 +684,32 @@ int add_mtd_partitions(struct mtd_info *
+ }
+ EXPORT_SYMBOL(add_mtd_partitions);
+ 
++int refresh_mtd_partitions(struct mtd_info *mtd)
++{
++	int ret = 0;
++
++	if (IS_PART(mtd)) {
++		struct mtd_part *part;
++		struct mtd_info *master;
++
++		part = PART(mtd);
++		master = part->master;
++		if (master->refresh_device)
++			ret = master->refresh_device(master);
++	}
++
++	if (!ret && mtd->refresh_device)
++		ret = mtd->refresh_device(mtd);
++
++#ifdef CONFIG_MTD_ROOTFS_SPLIT
++	if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
++		refresh_rootfs_split(mtd);
++#endif
++
++	return 0;
++}
++EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
++
+ static DEFINE_SPINLOCK(part_parser_lock);
+ static LIST_HEAD(part_parsers);
+ 
+--- a/drivers/mtd/devices/block2mtd.c
++++ b/drivers/mtd/devices/block2mtd.c
+@@ -29,6 +29,8 @@ struct block2mtd_dev {
  	struct block_device *blkdev;
  	struct mtd_info mtd;
  	struct mutex write_mutex;
@@ -10,7 +271,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  };
  
  
-@@ -80,6 +82,12 @@
+@@ -81,6 +83,12 @@ static int block2mtd_erase(struct mtd_in
  	size_t len = instr->len;
  	int err;
  
@@ -23,7 +284,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  	instr->state = MTD_ERASING;
  	mutex_lock(&dev->write_mutex);
  	err = _block2mtd_erase(dev, from, len);
-@@ -92,6 +100,10 @@
+@@ -93,6 +101,10 @@ static int block2mtd_erase(struct mtd_in
  
  	instr->state = MTD_ERASE_DONE;
  	mtd_erase_callback(instr);
@@ -34,7 +295,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  	return err;
  }
  
-@@ -103,10 +115,14 @@
+@@ -104,10 +116,14 @@ static int block2mtd_read(struct mtd_inf
  	struct page *page;
  	int index = from >> PAGE_SHIFT;
  	int offset = from & (PAGE_SIZE-1);
@@ -52,7 +313,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  	if (from + len > mtd->size)
  		len = mtd->size - from;
  
-@@ -121,10 +137,14 @@
+@@ -122,10 +138,14 @@ static int block2mtd_read(struct mtd_inf
  		len = len - cpylen;
  
  		page = page_read(dev->blkdev->bd_inode->i_mapping, index);
@@ -71,7 +332,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  
  		memcpy(buf, page_address(page) + offset, cpylen);
  		page_cache_release(page);
-@@ -135,7 +155,10 @@
+@@ -136,7 +156,10 @@ static int block2mtd_read(struct mtd_inf
  		offset = 0;
  		index++;
  	}
@@ -83,7 +344,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  }
  
  
-@@ -187,12 +210,22 @@
+@@ -188,12 +211,22 @@ static int block2mtd_write(struct mtd_in
  		size_t *retlen, const u_char *buf)
  {
  	struct block2mtd_dev *dev = mtd->priv;
@@ -110,7 +371,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  	if (to + len > mtd->size)
  		len = mtd->size - to;
  
-@@ -201,6 +234,9 @@
+@@ -202,6 +235,9 @@ static int block2mtd_write(struct mtd_in
  	mutex_unlock(&dev->write_mutex);
  	if (err > 0)
  		err = 0;
@@ -120,7 +381,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  	return err;
  }
  
-@@ -209,30 +245,15 @@
+@@ -210,52 +246,29 @@ static int block2mtd_write(struct mtd_in
  static void block2mtd_sync(struct mtd_info *mtd)
  {
  	struct block2mtd_dev *dev = mtd->priv;
@@ -128,37 +389,44 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
 -	return;
 -}
 -
-+	read_lock(&dev->bdev_mutex);
-+	if (dev->blkdev)
-+		sync_blockdev(dev->blkdev);
-+	read_unlock(&dev->bdev_mutex);
- 
+-
 -static void block2mtd_free_device(struct block2mtd_dev *dev)
 -{
 -	if (!dev)
 -		return;
 -
 -	kfree(dev->mtd.name);
--
+ 
 -	if (dev->blkdev) {
 -		invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
 -					0, -1);
 -		close_bdev_exclusive(dev->blkdev, FMODE_READ|FMODE_WRITE);
 -	}
--
++	read_lock(&dev->bdev_mutex);
++	if (dev->blkdev)
++		sync_blockdev(dev->blkdev);
++	read_unlock(&dev->bdev_mutex);
+ 
 -	kfree(dev);
 +	return;
  }
  
--
+ 
 -/* FIXME: ensure that mtd->size % erase_size == 0 */
--static struct block2mtd_dev *add_device(char *devname, int erase_size)
+-static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
 +static int _open_bdev(struct block2mtd_dev *dev)
  {
  	struct block_device *bdev;
- 	struct block2mtd_dev *dev;
-@@ -246,14 +267,14 @@
- 		return NULL;
+-	struct block2mtd_dev *dev;
+-	struct mtd_partition *part;
+-	char *name;
+-
+-	if (!devname)
+-		return NULL;
+-
+-	dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
+-	if (!dev)
+-		return NULL;
  
  	/* Get a handle on the device */
 -	bdev = open_bdev_exclusive(devname, FMODE_READ|FMODE_WRITE, NULL);
@@ -174,7 +442,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  		if (devt) {
  			bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
  		}
-@@ -261,17 +282,97 @@
+@@ -263,17 +276,97 @@ static struct block2mtd_dev *add_device(
  #endif
  
  	if (IS_ERR(bdev)) {
@@ -273,39 +541,18 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/devices/block2mtd.c linux-2.6.29-rc3
  	mutex_init(&dev->write_mutex);
 +	rwlock_init(&dev->bdev_mutex);
  
- 	/* Setup the MTD structure */
- 	/* make the name contain the block device in */
-@@ -295,6 +396,7 @@
+ 	if (!mtdname)
+ 		mtdname = devname;
+@@ -297,6 +390,7 @@ static struct block2mtd_dev *add_device(
  	dev->mtd.read = block2mtd_read;
  	dev->mtd.priv = dev;
  	dev->mtd.owner = THIS_MODULE;
 +	dev->mtd.refresh_device = block2mtd_refresh;
  
- 	if (add_mtd_device(&dev->mtd)) {
- 		/* Device didnt get added, so free the entry */
-diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/Kconfig linux-2.6.29-rc3/drivers/mtd/Kconfig
---- linux-2.6.29-rc3.orig/drivers/mtd/Kconfig	2009-03-09 05:13:51.000000000 +0100
-+++ linux-2.6.29-rc3/drivers/mtd/Kconfig	2009-03-09 18:10:48.000000000 +0100
-@@ -53,6 +53,16 @@
- 	  should normally be compiled as kernel modules. The modules perform
- 	  various checks and verifications when loaded.
- 
-+config MTD_ROOTFS_ROOT_DEV
-+	bool "Automatically set 'rootfs' partition to be root filesystem"
-+	depends on MTD_PARTITIONS
-+	default y
-+
-+config MTD_ROOTFS_SPLIT
-+	bool "Automatically split 'rootfs' partition for squashfs"
-+	depends on MTD_PARTITIONS
-+	default y
-+
- config MTD_REDBOOT_PARTS
- 	tristate "RedBoot partition table parsing"
- 	depends on MTD_PARTITIONS
-diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/mtdchar.c linux-2.6.29-rc3/drivers/mtd/mtdchar.c
---- linux-2.6.29-rc3.orig/drivers/mtd/mtdchar.c	2009-03-09 05:13:51.000000000 +0100
-+++ linux-2.6.29-rc3/drivers/mtd/mtdchar.c	2009-03-09 18:10:48.000000000 +0100
+ 	part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
+ 	part->name = dev->mtd.name;
+--- a/drivers/mtd/mtdchar.c
++++ b/drivers/mtd/mtdchar.c
 @@ -16,6 +16,7 @@
  
  #include <linux/mtd/mtd.h>
@@ -314,7 +561,7 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/mtdchar.c linux-2.6.29-rc3/drivers/m
  
  #include <asm/uaccess.h>
  
-@@ -773,6 +774,13 @@
+@@ -773,6 +774,13 @@ static int mtd_ioctl(struct inode *inode
  		file->f_pos = 0;
  		break;
  	}
@@ -328,246 +575,9 @@ diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/mtdchar.c linux-2.6.29-rc3/drivers/m
  
  	default:
  		ret = -ENOTTY;
-diff -ruN linux-2.6.29-rc3.orig/drivers/mtd/mtdpart.c linux-2.6.29-rc3/drivers/mtd/mtdpart.c
---- linux-2.6.29-rc3.orig/drivers/mtd/mtdpart.c	2009-03-09 05:13:51.000000000 +0100
-+++ linux-2.6.29-rc3/drivers/mtd/mtdpart.c	2009-03-09 18:29:58.000000000 +0100
-@@ -18,6 +18,8 @@
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/partitions.h>
- #include <linux/mtd/compatmac.h>
-+#include <linux/squashfs_fs.h>
-+#include <linux/root_dev.h>
- 
- /* Our partition linked list */
- static LIST_HEAD(mtd_partitions);
-@@ -37,7 +39,7 @@
-  * the pointer to that structure with this macro.
-  */
- #define PART(x)  ((struct mtd_part *)(x))
--
-+#define IS_PART(mtd) (mtd->read == part_read)
- 
- /*
-  * MTD methods which simply translate the effective address and pass through
-@@ -489,6 +491,148 @@
- 	return slave;
- }
- 
-+#ifdef CONFIG_MTD_ROOTFS_SPLIT
-+#define ROOTFS_SPLIT_NAME "rootfs_data"
-+#define ROOTFS_REMOVED_NAME "<removed>"
-+static int split_squashfs(struct mtd_info *master, int offset, int *split_offset)
-+{
-+	char buf[512];
-+	struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
-+	int len, ret;
-+
-+	ret = master->read(master, offset, sizeof(*sb), &len, buf);
-+	if (ret || (len != sizeof(*sb))) {
-+		printk(KERN_ALERT "split_squashfs: error occured while reading "
-+			"from \"%s\"\n", master->name);
-+		return -EINVAL;
-+	}
-+
-+	if (*((u32 *) buf) != SQUASHFS_MAGIC) {
-+		printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
-+			master->name);
-+		*split_offset = 0;
-+		return 0;
-+	}
-+
-+	if (sb->bytes_used <= 0) {
-+		printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
-+			master->name);
-+		*split_offset = 0;
-+		return 0;
-+	}
-+
-+	len = (u32) sb->bytes_used;
-+	len += (offset & 0x000fffff);
-+	len +=  (master->erasesize - 1);
-+	len &= ~(master->erasesize - 1);
-+	len -= (offset & 0x000fffff);
-+	*split_offset = offset + len;
-+
-+	return 0;
-+}
-+
-+static int split_rootfs_data(struct mtd_info *master, struct mtd_info *rpart, const struct mtd_partition *part,
-+		int index)
-+{
-+	struct mtd_partition *dpart;
-+	struct mtd_part *slave = NULL;
-+	int split_offset = 0;
-+	int ret;
-+
-+	ret = split_squashfs(master, part->offset, &split_offset);
-+	if (ret)
-+		return ret;
-+
-+	if (split_offset <= 0)
-+		return 0;
-+
-+	dpart = kmalloc(sizeof(*part)+sizeof(ROOTFS_SPLIT_NAME)+1, GFP_KERNEL);
-+	if (dpart == NULL) {
-+		printk(KERN_INFO "split_squashfs: no memory for partition \"%s\"\n",
-+			ROOTFS_SPLIT_NAME);
-+		return -ENOMEM;
-+	}
-+
-+	memcpy(dpart, part, sizeof(*part));
-+	dpart->name = (unsigned char *)&dpart[1];
-+	strcpy(dpart->name, ROOTFS_SPLIT_NAME);
-+
-+	dpart->size -= split_offset - dpart->offset;
-+	dpart->offset = split_offset;
-+
-+	if (dpart == NULL)
-+		return 1;
-+
-+	printk(KERN_INFO "mtd: partition \"%s\" created automatically, ofs=%X, len=%X \n",
-+		ROOTFS_SPLIT_NAME, dpart->offset, dpart->size);
-+
-+	slave = add_one_partition(master, dpart, index, split_offset);
-+	if (!slave) {
-+		kfree(dpart);
-+		return -ENOMEM;
-+	}
-+	rpart->split = &slave->mtd;
-+
-+	return 0;
-+}
-+
-+static int refresh_rootfs_split(struct mtd_info *mtd)
-+{
-+	struct mtd_partition tpart;
-+	struct mtd_part *part;
-+	char *name;
-+	int index = 0;
-+	int offset, size;
-+	int ret;
-+
-+	part = PART(mtd);
-+
-+	/* check for the new squashfs offset first */
-+	ret = split_squashfs(part->master, part->offset, &offset);
-+	if (ret)
-+		return ret;
-+
-+	if ((offset > 0) && !mtd->split) {
-+		printk(KERN_INFO "%s: creating new split partition for \"%s\"\n", __func__, mtd->name);
-+		/* if we don't have a rootfs split partition, create a new one */
-+		tpart.name = (char *) mtd->name;
-+		tpart.size = mtd->size;
-+		tpart.offset = part->offset;
-+
-+		/* find the index of the last partition */
-+		if (!list_empty(&mtd_partitions))
-+			index = list_first_entry(&mtd_partitions, struct mtd_part, list)->index + 1;
-+
-+		return split_rootfs_data(part->master, &part->mtd, &tpart, index);
-+	} else if ((offset > 0) && mtd->split) {
-+		/* update the offsets of the existing partition */
-+		size = mtd->size + part->offset - offset;
-+
-+		part = PART(mtd->split);
-+		part->offset = offset;
-+		part->mtd.size = size;
-+		printk(KERN_INFO "%s: %s partition \"" ROOTFS_SPLIT_NAME "\", offset: 0x%06x (0x%06x)\n",
-+			__func__, (!strcmp(part->mtd.name, ROOTFS_SPLIT_NAME) ? "updating" : "creating"),
-+			part->offset, part->mtd.size);
-+		name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
-+		strcpy(name, ROOTFS_SPLIT_NAME);
-+		part->mtd.name = name;
-+	} else if ((offset <= 0) && mtd->split) {
-+		printk(KERN_INFO "%s: removing partition \"%s\"\n", __func__, mtd->split->name);
-+
-+		/* mark existing partition as removed */
-+		part = PART(mtd->split);
-+		name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
-+		strcpy(name, ROOTFS_REMOVED_NAME);
-+		part->mtd.name = name;
-+		part->offset = 0;
-+		part->mtd.size = 0;
-+	}
-+
-+	return 0;
-+}
-+#endif /* CONFIG_MTD_ROOTFS_SPLIT */
-+
- /*
-  * This function, given a master MTD object and a partition table, creates
-  * and registers slave MTD objects which are bound to the master according to
-@@ -502,14 +646,29 @@
- {
- 	struct mtd_part *slave;
- 	uint64_t cur_offset = 0;
--	int i;
-+    int i, j, ret;
- 
- 	printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
- 
--	for (i = 0; i < nbparts; i++) {
--		slave = add_one_partition(master, parts + i, i, cur_offset);
-+	for (i = 0, j = 0; i < nbparts; i++) {
-+		slave = add_one_partition(master, parts + i, j++, cur_offset);
- 		if (!slave)
- 			return -ENOMEM;
-+
-+		if (!strcmp(parts[i].name, "rootfs") && slave->registered) {
-+#ifdef CONFIG_MTD_ROOTFS_ROOT_DEV
-+			if (ROOT_DEV == 0) {
-+				printk(KERN_NOTICE "mtd: partition \"rootfs\" "
-+					"set to be root filesystem\n");
-+				ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, slave->mtd.index);
-+			}
-+#endif
-+#ifdef CONFIG_MTD_ROOTFS_SPLIT
-+			ret = split_rootfs_data(master, &slave->mtd, &parts[i], j);
-+			if (ret == 0)
-+				j++;
-+#endif
-+		}
- 		cur_offset = slave->offset + slave->mtd.size;
- 	}
- 
-@@ -517,6 +676,32 @@
- }
- EXPORT_SYMBOL(add_mtd_partitions);
- 
-+int refresh_mtd_partitions(struct mtd_info *mtd)
-+{
-+	int ret = 0;
-+
-+	if (IS_PART(mtd)) {
-+		struct mtd_part *part;
-+		struct mtd_info *master;
-+
-+		part = PART(mtd);
-+		master = part->master;
-+		if (master->refresh_device)
-+			ret = master->refresh_device(master);
-+	}
-+
-+	if (!ret && mtd->refresh_device)
-+		ret = mtd->refresh_device(mtd);
-+
-+#ifdef CONFIG_MTD_ROOTFS_SPLIT
-+	if (!ret && IS_PART(mtd) && !strcmp(mtd->name, "rootfs"))
-+		refresh_rootfs_split(mtd);
-+#endif
-+
-+	return 0;
-+}
-+EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
-+
- static DEFINE_SPINLOCK(part_parser_lock);
- static LIST_HEAD(part_parsers);
- 
-diff -ruN linux-2.6.29-rc3.orig/include/linux/mtd/mtd.h linux-2.6.29-rc3/include/linux/mtd/mtd.h
---- linux-2.6.29-rc3.orig/include/linux/mtd/mtd.h	2009-03-09 05:13:58.000000000 +0100
-+++ linux-2.6.29-rc3/include/linux/mtd/mtd.h	2009-03-09 18:10:48.000000000 +0100
-@@ -100,6 +100,7 @@
+--- a/include/linux/mtd/mtd.h
++++ b/include/linux/mtd/mtd.h
+@@ -100,6 +100,7 @@ struct mtd_oob_ops {
  	uint8_t		*oobbuf;
  };
  
@@ -575,7 +585,7 @@ diff -ruN linux-2.6.29-rc3.orig/include/linux/mtd/mtd.h linux-2.6.29-rc3/include
  struct mtd_info {
  	u_char type;
  	uint32_t flags;
-@@ -225,6 +226,9 @@
+@@ -225,6 +226,9 @@ struct mtd_info {
  	struct module *owner;
  	int usecount;
  
@@ -585,9 +595,8 @@ diff -ruN linux-2.6.29-rc3.orig/include/linux/mtd/mtd.h linux-2.6.29-rc3/include
  	/* If the driver is something smart, like UBI, it may need to maintain
  	 * its own reference counting. The below functions are only for driver.
  	 * The driver may register its callbacks. These callbacks are not
-diff -ruN linux-2.6.29-rc3.orig/include/linux/mtd/partitions.h linux-2.6.29-rc3/include/linux/mtd/partitions.h
---- linux-2.6.29-rc3.orig/include/linux/mtd/partitions.h	2009-03-09 05:13:58.000000000 +0100
-+++ linux-2.6.29-rc3/include/linux/mtd/partitions.h	2009-03-09 18:10:48.000000000 +0100
+--- a/include/linux/mtd/partitions.h
++++ b/include/linux/mtd/partitions.h
 @@ -34,6 +34,7 @@
   * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
   */
@@ -596,7 +605,7 @@ diff -ruN linux-2.6.29-rc3.orig/include/linux/mtd/partitions.h linux-2.6.29-rc3/
  struct mtd_partition {
  	char *name;			/* identifier string */
  	uint64_t size;			/* partition size */
-@@ -41,6 +42,7 @@
+@@ -41,6 +42,7 @@ struct mtd_partition {
  	uint32_t mask_flags;		/* master MTD flags to mask out for this partition */
  	struct nand_ecclayout *ecclayout;	/* out of band layout for this partition (NAND only)*/
  	struct mtd_info **mtdp;		/* pointer to store the MTD object */
@@ -604,7 +613,7 @@ diff -ruN linux-2.6.29-rc3.orig/include/linux/mtd/partitions.h linux-2.6.29-rc3/
  };
  
  #define MTDPART_OFS_NXTBLK	(-2)
-@@ -50,6 +52,7 @@
+@@ -50,6 +52,7 @@ struct mtd_partition {
  
  int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
  int del_mtd_partitions(struct mtd_info *);
@@ -612,10 +621,9 @@ diff -ruN linux-2.6.29-rc3.orig/include/linux/mtd/partitions.h linux-2.6.29-rc3/
  
  /*
   * Functions dealing with the various ways of partitioning the space
-diff -ruN linux-2.6.29-rc3.orig/include/mtd/mtd-abi.h linux-2.6.29-rc3/include/mtd/mtd-abi.h
---- linux-2.6.29-rc3.orig/include/mtd/mtd-abi.h	2009-03-09 05:13:57.000000000 +0100
-+++ linux-2.6.29-rc3/include/mtd/mtd-abi.h	2009-03-09 18:10:48.000000000 +0100
-@@ -93,6 +93,7 @@
+--- a/include/mtd/mtd-abi.h
++++ b/include/mtd/mtd-abi.h
+@@ -93,6 +93,7 @@ struct otp_info {
  #define ECCGETLAYOUT		_IOR('M', 17, struct nand_ecclayout)
  #define ECCGETSTATS		_IOR('M', 18, struct mtd_ecc_stats)
  #define MTDFILEMODE		_IO('M', 19)