remove 2.6.23 support, as the last target using that has been nuked, too

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16275 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 0 insertions, 944 deletions

diff --git a/target/linux/generic-2.6/patches-2.6.23/065-rootfs_split.patch b/target/linux/generic-2.6/patches-2.6.23/065-rootfs_split.patch
deleted file mode 100644
index f308525bd..000000000
--- a/target/linux/generic-2.6/patches-2.6.23/065-rootfs_split.patch
+++ /dev/null
@@ -1,944 +0,0 @@
---- a/drivers/mtd/Kconfig
-+++ b/drivers/mtd/Kconfig
-@@ -47,6 +47,16 @@ config MTD_PARTITIONS
- 	  devices. Partitioning on NFTL 'devices' is a different - that's the
- 	  'normal' form of partitioning used on a block device.
- 
-+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
-@@ -20,6 +20,8 @@
- #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);
-@@ -39,7 +41,7 @@ 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
-@@ -308,6 +310,312 @@ int del_mtd_partitions(struct mtd_info *
- 	return 0;
- }
- 
-+static u_int32_t cur_offset = 0;
-+static int add_one_partition(struct mtd_info *master, const struct mtd_partition *part,
-+		int i, struct mtd_part **slp)
-+{
-+	struct mtd_part *slave;
-+
-+	/* allocate the partition structure */
-+	slave = kzalloc (sizeof(*slave), GFP_KERNEL);
-+	if (!slave) {
-+		printk ("memory allocation error while creating partitions for \"%s\"\n",
-+			master->name);
-+		del_mtd_partitions(master);
-+		return -ENOMEM;
-+	}
-+	list_add(&slave->list, &mtd_partitions);
-+
-+	/* set up the MTD object for this partition */
-+	slave->mtd.type = master->type;
-+	slave->mtd.flags = master->flags & ~part->mask_flags;
-+	slave->mtd.size = part->size;
-+	slave->mtd.writesize = master->writesize;
-+	slave->mtd.oobsize = master->oobsize;
-+	slave->mtd.oobavail = master->oobavail;
-+	slave->mtd.subpage_sft = master->subpage_sft;
-+
-+	slave->mtd.name = part->name;
-+	slave->mtd.owner = master->owner;
-+
-+	slave->mtd.read = part_read;
-+	slave->mtd.write = part_write;
-+	slave->mtd.refresh_device = part->refresh_partition;
-+
-+	if(master->point && master->unpoint){
-+		slave->mtd.point = part_point;
-+		slave->mtd.unpoint = part_unpoint;
-+	}
-+
-+	if (master->read_oob)
-+		slave->mtd.read_oob = part_read_oob;
-+	if (master->write_oob)
-+		slave->mtd.write_oob = part_write_oob;
-+	if(master->read_user_prot_reg)
-+		slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
-+	if(master->read_fact_prot_reg)
-+		slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
-+	if(master->write_user_prot_reg)
-+		slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
-+	if(master->lock_user_prot_reg)
-+		slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
-+	if(master->get_user_prot_info)
-+		slave->mtd.get_user_prot_info = part_get_user_prot_info;
-+	if(master->get_fact_prot_info)
-+		slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
-+	if (master->sync)
-+		slave->mtd.sync = part_sync;
-+	if (!i && master->suspend && master->resume) {
-+			slave->mtd.suspend = part_suspend;
-+			slave->mtd.resume = part_resume;
-+	}
-+	if (master->writev)
-+		slave->mtd.writev = part_writev;
-+	if (master->lock)
-+		slave->mtd.lock = part_lock;
-+	if (master->unlock)
-+		slave->mtd.unlock = part_unlock;
-+	if (master->block_isbad)
-+		slave->mtd.block_isbad = part_block_isbad;
-+	if (master->block_markbad)
-+		slave->mtd.block_markbad = part_block_markbad;
-+	slave->mtd.erase = part_erase;
-+	slave->master = master;
-+	slave->offset = part->offset;
-+	slave->index = i;
-+
-+	if (slave->offset == MTDPART_OFS_APPEND)
-+		slave->offset = cur_offset;
-+	if (slave->offset == MTDPART_OFS_NXTBLK) {
-+		slave->offset = cur_offset;
-+		if ((cur_offset % master->erasesize) != 0) {
-+			/* Round up to next erasesize */
-+			slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
-+			printk(KERN_NOTICE "Moving partition %d: "
-+			       "0x%08x -> 0x%08x\n", i,
-+			       cur_offset, slave->offset);
-+		}
-+	}
-+	if (slave->mtd.size == MTDPART_SIZ_FULL)
-+		slave->mtd.size = master->size - slave->offset;
-+	cur_offset = slave->offset + slave->mtd.size;
-+
-+	printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
-+		slave->offset + slave->mtd.size, slave->mtd.name);
-+
-+	/* let's do some sanity checks */
-+	if (slave->offset >= master->size) {
-+			/* let's register it anyway to preserve ordering */
-+		slave->offset = 0;
-+		slave->mtd.size = 0;
-+		printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
-+			part->name);
-+	}
-+	if (slave->offset + slave->mtd.size > master->size) {
-+		slave->mtd.size = master->size - slave->offset;
-+		printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
-+			part->name, master->name, slave->mtd.size);
-+	}
-+	if (master->numeraseregions>1) {
-+		/* Deal with variable erase size stuff */
-+		int i;
-+		struct mtd_erase_region_info *regions = master->eraseregions;
-+
-+		/* Find the first erase regions which is part of this partition. */
-+		for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
-+			;
-+
-+		for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
-+			if (slave->mtd.erasesize < regions[i].erasesize) {
-+				slave->mtd.erasesize = regions[i].erasesize;
-+			}
-+		}
-+	} else {
-+		/* Single erase size */
-+		slave->mtd.erasesize = master->erasesize;
-+	}
-+
-+	if ((slave->mtd.flags & MTD_WRITEABLE) &&
-+	    (slave->offset % slave->mtd.erasesize)) {
-+		/* Doesn't start on a boundary of major erase size */
-+		/* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
-+		slave->mtd.flags &= ~MTD_WRITEABLE;
-+		printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
-+			part->name);
-+	}
-+	if ((slave->mtd.flags & MTD_WRITEABLE) &&
-+	    (slave->mtd.size % slave->mtd.erasesize)) {
-+		slave->mtd.flags &= ~MTD_WRITEABLE;
-+		printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
-+			part->name);
-+	}
-+
-+	slave->mtd.ecclayout = master->ecclayout;
-+	if (master->block_isbad) {
-+		uint32_t offs = 0;
-+
-+		while(offs < slave->mtd.size) {
-+			if (master->block_isbad(master,
-+						offs + slave->offset))
-+				slave->mtd.ecc_stats.badblocks++;
-+			offs += slave->mtd.erasesize;
-+		}
-+	}
-+
-+	if(part->mtdp)
-+	{	/* store the object pointer (caller may or may not register it */
-+		*part->mtdp = &slave->mtd;
-+		slave->registered = 0;
-+	}
-+	else
-+	{
-+		/* register our partition */
-+		add_mtd_device(&slave->mtd);
-+		slave->registered = 1;
-+	}
-+
-+	if (slp)
-+		*slp = slave;
-+
-+	return 0;
-+}
-+
-+#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, 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);
-+
-+	ret = add_one_partition(master, dpart, index, &slave);
-+	if (ret)
-+		kfree(dpart);
-+	else if (slave)
-+		rpart->split = &slave->mtd;
-+
-+	return ret;
-+}
-+
-+static int refresh_rootfs_split(struct mtd_info *mtd)
-+{
-+	struct mtd_partition tpart;
-+	struct mtd_part *part;
-+	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 = 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);
-+		strcpy(part->mtd.name, ROOTFS_SPLIT_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);
-+		strcpy(part->mtd.name, ROOTFS_REMOVED_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
-@@ -320,168 +628,31 @@ int add_mtd_partitions(struct mtd_info *
- 		       int nbparts)
- {
- 	struct mtd_part *slave;
--	u_int32_t cur_offset = 0;
--	int i;
-+	struct mtd_partition *part;
-+	int i, j, ret = 0;
- 
- 	printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
- 
--	for (i = 0; i < nbparts; i++) {
--
--		/* allocate the partition structure */
--		slave = kzalloc (sizeof(*slave), GFP_KERNEL);
--		if (!slave) {
--			printk ("memory allocation error while creating partitions for \"%s\"\n",
--				master->name);
--			del_mtd_partitions(master);
--			return -ENOMEM;
--		}
--		list_add(&slave->list, &mtd_partitions);
--
--		/* set up the MTD object for this partition */
--		slave->mtd.type = master->type;
--		slave->mtd.flags = master->flags & ~parts[i].mask_flags;
--		slave->mtd.size = parts[i].size;
--		slave->mtd.writesize = master->writesize;
--		slave->mtd.oobsize = master->oobsize;
--		slave->mtd.oobavail = master->oobavail;
--		slave->mtd.subpage_sft = master->subpage_sft;
--
--		slave->mtd.name = parts[i].name;
--		slave->mtd.owner = master->owner;
--
--		slave->mtd.read = part_read;
--		slave->mtd.write = part_write;
--
--		if(master->point && master->unpoint){
--			slave->mtd.point = part_point;
--			slave->mtd.unpoint = part_unpoint;
--		}
--
--		if (master->read_oob)
--			slave->mtd.read_oob = part_read_oob;
--		if (master->write_oob)
--			slave->mtd.write_oob = part_write_oob;
--		if(master->read_user_prot_reg)
--			slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
--		if(master->read_fact_prot_reg)
--			slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
--		if(master->write_user_prot_reg)
--			slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
--		if(master->lock_user_prot_reg)
--			slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
--		if(master->get_user_prot_info)
--			slave->mtd.get_user_prot_info = part_get_user_prot_info;
--		if(master->get_fact_prot_info)
--			slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
--		if (master->sync)
--			slave->mtd.sync = part_sync;
--		if (!i && master->suspend && master->resume) {
--				slave->mtd.suspend = part_suspend;
--				slave->mtd.resume = part_resume;
--		}
--		if (master->writev)
--			slave->mtd.writev = part_writev;
--		if (master->lock)
--			slave->mtd.lock = part_lock;
--		if (master->unlock)
--			slave->mtd.unlock = part_unlock;
--		if (master->block_isbad)
--			slave->mtd.block_isbad = part_block_isbad;
--		if (master->block_markbad)
--			slave->mtd.block_markbad = part_block_markbad;
--		slave->mtd.erase = part_erase;
--		slave->master = master;
--		slave->offset = parts[i].offset;
--		slave->index = i;
--
--		if (slave->offset == MTDPART_OFS_APPEND)
--			slave->offset = cur_offset;
--		if (slave->offset == MTDPART_OFS_NXTBLK) {
--			slave->offset = cur_offset;
--			if ((cur_offset % master->erasesize) != 0) {
--				/* Round up to next erasesize */
--				slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
--				printk(KERN_NOTICE "Moving partition %d: "
--				       "0x%08x -> 0x%08x\n", i,
--				       cur_offset, slave->offset);
--			}
--		}
--		if (slave->mtd.size == MTDPART_SIZ_FULL)
--			slave->mtd.size = master->size - slave->offset;
--		cur_offset = slave->offset + slave->mtd.size;
--
--		printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
--			slave->offset + slave->mtd.size, slave->mtd.name);
--
--		/* let's do some sanity checks */
--		if (slave->offset >= master->size) {
--				/* let's register it anyway to preserve ordering */
--			slave->offset = 0;
--			slave->mtd.size = 0;
--			printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
--				parts[i].name);
--		}
--		if (slave->offset + slave->mtd.size > master->size) {
--			slave->mtd.size = master->size - slave->offset;
--			printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
--				parts[i].name, master->name, slave->mtd.size);
--		}
--		if (master->numeraseregions>1) {
--			/* Deal with variable erase size stuff */
--			int i;
--			struct mtd_erase_region_info *regions = master->eraseregions;
--
--			/* Find the first erase regions which is part of this partition. */
--			for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
--				;
--
--			for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
--				if (slave->mtd.erasesize < regions[i].erasesize) {
--					slave->mtd.erasesize = regions[i].erasesize;
--				}
-+	for (i = 0, j = 0; i < nbparts; i++) {
-+		part = (struct mtd_partition *) &parts[i];
-+		ret = add_one_partition(master, part, j, &slave);
-+		if (ret)
-+			return ret;
-+		j++;
-+
-+		if (strcmp(part->name, "rootfs") == 0 && 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);
- 			}
--		} else {
--			/* Single erase size */
--			slave->mtd.erasesize = master->erasesize;
--		}
--
--		if ((slave->mtd.flags & MTD_WRITEABLE) &&
--		    (slave->offset % slave->mtd.erasesize)) {
--			/* Doesn't start on a boundary of major erase size */
--			/* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
--			slave->mtd.flags &= ~MTD_WRITEABLE;
--			printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
--				parts[i].name);
--		}
--		if ((slave->mtd.flags & MTD_WRITEABLE) &&
--		    (slave->mtd.size % slave->mtd.erasesize)) {
--			slave->mtd.flags &= ~MTD_WRITEABLE;
--			printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
--				parts[i].name);
--		}
--
--		slave->mtd.ecclayout = master->ecclayout;
--		if (master->block_isbad) {
--			uint32_t offs = 0;
--
--			while(offs < slave->mtd.size) {
--				if (master->block_isbad(master,
--							offs + slave->offset))
--					slave->mtd.ecc_stats.badblocks++;
--				offs += slave->mtd.erasesize;
--			}
--		}
--
--		if(parts[i].mtdp)
--		{	/* store the object pointer (caller may or may not register it */
--			*parts[i].mtdp = &slave->mtd;
--			slave->registered = 0;
--		}
--		else
--		{
--			/* register our partition */
--			add_mtd_device(&slave->mtd);
--			slave->registered = 1;
-+#endif
-+#ifdef CONFIG_MTD_ROOTFS_SPLIT
-+			ret = split_rootfs_data(master, &slave->mtd, part, j);
-+			if (ret == 0)
-+				j++;
-+#endif
- 		}
- 	}
- 
-@@ -557,6 +728,32 @@ int parse_mtd_partitions(struct mtd_info
- 	return ret;
- }
- 
-+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(parse_mtd_partitions);
-+EXPORT_SYMBOL_GPL(refresh_mtd_partitions);
- EXPORT_SYMBOL_GPL(register_mtd_parser);
- EXPORT_SYMBOL_GPL(deregister_mtd_parser);
---- a/drivers/mtd/devices/block2mtd.c
-+++ b/drivers/mtd/devices/block2mtd.c
-@@ -34,6 +34,8 @@ struct block2mtd_dev {
- 	struct block_device *blkdev;
- 	struct mtd_info mtd;
- 	struct mutex write_mutex;
-+	rwlock_t bdev_mutex;
-+	char devname[0];
- };
- 
- 
-@@ -86,6 +88,12 @@ static int block2mtd_erase(struct mtd_in
- 	size_t len = instr->len;
- 	int err;
- 
-+	read_lock(&dev->bdev_mutex);
-+	if (!dev->blkdev) {
-+		err = -EINVAL;
-+		goto done;
-+	}
-+
- 	instr->state = MTD_ERASING;
- 	mutex_lock(&dev->write_mutex);
- 	err = _block2mtd_erase(dev, from, len);
-@@ -98,6 +106,10 @@ static int block2mtd_erase(struct mtd_in
- 
- 	instr->state = MTD_ERASE_DONE;
- 	mtd_erase_callback(instr);
-+
-+done:
-+	read_unlock(&dev->bdev_mutex);
-+
- 	return err;
- }
- 
-@@ -109,10 +121,14 @@ static int block2mtd_read(struct mtd_inf
- 	struct page *page;
- 	int index = from >> PAGE_SHIFT;
- 	int offset = from & (PAGE_SIZE-1);
--	int cpylen;
-+	int cpylen, err = 0;
-+
-+	read_lock(&dev->bdev_mutex);
-+	if (!dev->blkdev || (from > mtd->size)) {
-+		err = -EINVAL;
-+		goto done;
-+	}
- 
--	if (from > mtd->size)
--		return -EINVAL;
- 	if (from + len > mtd->size)
- 		len = mtd->size - from;
- 
-@@ -127,10 +143,14 @@ static int block2mtd_read(struct mtd_inf
- 		len = len - cpylen;
- 
- 		page = page_read(dev->blkdev->bd_inode->i_mapping, index);
--		if (!page)
--			return -ENOMEM;
--		if (IS_ERR(page))
--			return PTR_ERR(page);
-+		if (!page) {
-+			err = -ENOMEM;
-+			goto done;
-+		}
-+		if (IS_ERR(page)) {
-+			err = PTR_ERR(page);
-+			goto done;
-+		}
- 
- 		memcpy(buf, page_address(page) + offset, cpylen);
- 		page_cache_release(page);
-@@ -141,7 +161,10 @@ static int block2mtd_read(struct mtd_inf
- 		offset = 0;
- 		index++;
- 	}
--	return 0;
-+
-+done:
-+	read_unlock(&dev->bdev_mutex);
-+	return err;
- }
- 
- 
-@@ -193,12 +216,22 @@ static int block2mtd_write(struct mtd_in
- 		size_t *retlen, const u_char *buf)
- {
- 	struct block2mtd_dev *dev = mtd->priv;
--	int err;
-+	int err = 0;
-+
-+	read_lock(&dev->bdev_mutex);
-+	if (!dev->blkdev) {
-+		err = -EINVAL;
-+		goto done;
-+	}
- 
- 	if (!len)
--		return 0;
--	if (to >= mtd->size)
--		return -ENOSPC;
-+		goto done;
-+
-+	if (to >= mtd->size) {
-+		err = -ENOSPC;
-+		goto done;
-+	}
-+
- 	if (to + len > mtd->size)
- 		len = mtd->size - to;
- 
-@@ -207,6 +240,9 @@ static int block2mtd_write(struct mtd_in
- 	mutex_unlock(&dev->write_mutex);
- 	if (err > 0)
- 		err = 0;
-+
-+done:
-+	read_unlock(&dev->bdev_mutex);
- 	return err;
- }
- 
-@@ -215,51 +251,29 @@ static int block2mtd_write(struct mtd_in
- static void block2mtd_sync(struct mtd_info *mtd)
- {
- 	struct block2mtd_dev *dev = mtd->priv;
--	sync_blockdev(dev->blkdev);
--	return;
--}
--
--
--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_excl(dev->blkdev);
--	}
-+	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, char *mtdname)
-+static int _open_bdev(struct block2mtd_dev *dev)
- {
- 	struct block_device *bdev;
--	struct block2mtd_dev *dev;
--	struct mtd_partition *part;
--
--	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_excl(devname, O_RDWR, NULL);
-+	bdev = open_bdev_excl(dev->devname, O_RDWR, NULL);
- #ifndef MODULE
- 	if (IS_ERR(bdev)) {
- 
- 		/* We might not have rootfs mounted at this point. Try
- 		   to resolve the device name by other means. */
- 
--		dev_t devt = name_to_dev_t(devname);
-+		dev_t devt = name_to_dev_t(dev->devname);
- 		if (devt) {
- 			bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
- 		}
-@@ -267,17 +281,96 @@ static struct block2mtd_dev *add_device(
- #endif
- 
- 	if (IS_ERR(bdev)) {
--		ERROR("error: cannot open device %s", devname);
--		goto devinit_err;
-+		ERROR("error: cannot open device %s", dev->devname);
-+		return 1;
- 	}
- 	dev->blkdev = bdev;
- 
- 	if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
- 		ERROR("attempting to use an MTD device as a block device");
--		goto devinit_err;
-+		return 1;
- 	}
- 
-+	return 0;
-+}
-+
-+static void _close_bdev(struct block2mtd_dev *dev)
-+{
-+	struct block_device *bdev;
-+
-+	if (!dev->blkdev)
-+		return;
-+
-+	bdev = dev->blkdev;
-+	invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, 0, -1);
-+	close_bdev_excl(dev->blkdev);
-+	dev->blkdev = NULL;
-+}
-+
-+static void block2mtd_free_device(struct block2mtd_dev *dev)
-+{
-+	if (!dev)
-+		return;
-+
-+	kfree(dev->mtd.name);
-+	_close_bdev(dev);
-+	kfree(dev);
-+}
-+
-+
-+static int block2mtd_refresh(struct mtd_info *mtd)
-+{
-+	struct block2mtd_dev *dev = mtd->priv;
-+	struct block_device *bdev;
-+	dev_t devt;
-+	int err = 0;
-+
-+	/* no other mtd function can run at this point */
-+	write_lock(&dev->bdev_mutex);
-+
-+	/* get the device number for the whole disk */
-+	devt = MKDEV(MAJOR(dev->blkdev->bd_dev), 0);
-+
-+	/* close the old block device */
-+	_close_bdev(dev);
-+
-+	/* open the whole disk, issue a partition rescan, then */
-+	bdev = open_by_devnum(devt, FMODE_WRITE | FMODE_READ);
-+	if (!bdev || !bdev->bd_disk)
-+		err = -EINVAL;
-+	else {
-+		err = rescan_partitions(bdev->bd_disk, bdev);
-+	}
-+	if (bdev)
-+		close_bdev_excl(bdev);
-+
-+	/* try to open the partition block device again */
-+	_open_bdev(dev);
-+	write_unlock(&dev->bdev_mutex);
-+
-+	return err;
-+}
-+
-+/* FIXME: ensure that mtd->size % erase_size == 0 */
-+static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
-+{
-+	struct block2mtd_dev *dev;
-+	struct mtd_partition *part;
-+
-+	if (!devname)
-+		return NULL;
-+
-+	dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL);
-+	if (!dev)
-+		return NULL;
-+
-+	strcpy(dev->devname, devname);
-+
-+	if (_open_bdev(dev))
-+		goto devinit_err;
-+
- 	mutex_init(&dev->write_mutex);
-+	rwlock_init(&dev->bdev_mutex);
- 
- 	/* Setup the MTD structure */
- 	/* make the name contain the block device in */
-@@ -304,6 +397,7 @@ 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;
- 	
- 	part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
- 	part->name = dev->mtd.name;
---- a/drivers/mtd/mtdchar.c
-+++ b/drivers/mtd/mtdchar.c
-@@ -17,6 +17,7 @@
- 
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/compatmac.h>
-+#include <linux/mtd/partitions.h>
- 
- #include <asm/uaccess.h>
- 
-@@ -753,6 +754,13 @@ static int mtd_ioctl(struct inode *inode
- 		file->f_pos = 0;
- 		break;
- 	}
-+#ifdef CONFIG_MTD_PARTITIONS
-+	case MTDREFRESH:
-+	{
-+		ret = refresh_mtd_partitions(mtd);
-+		break;
-+	}
-+#endif
- 
- 	default:
- 		ret = -ENOTTY;
---- a/include/linux/mtd/mtd.h
-+++ b/include/linux/mtd/mtd.h
-@@ -98,6 +98,7 @@ struct mtd_oob_ops {
- 	uint8_t		*oobbuf;
- };
- 
-+struct mtd_info;
- struct mtd_info {
- 	u_char type;
- 	u_int32_t flags;
-@@ -195,6 +196,9 @@ struct mtd_info {
- 	struct module *owner;
- 	int usecount;
- 
-+	int (*refresh_device)(struct mtd_info *mtd);
-+	struct mtd_info *split;
-+
- 	/* 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
---- a/include/linux/mtd/partitions.h
-+++ b/include/linux/mtd/partitions.h
-@@ -36,6 +36,7 @@
-  * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
-  */
- 
-+struct mtd_partition;
- struct mtd_partition {
- 	char *name;			/* identifier string */
- 	u_int32_t size;			/* partition size */
-@@ -43,6 +44,7 @@ struct mtd_partition {
- 	u_int32_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 */
-+	int (*refresh_partition)(struct mtd_info *);
- };
- 
- #define MTDPART_OFS_NXTBLK	(-2)
-@@ -52,6 +54,7 @@ struct mtd_partition {
- 
- int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
- int del_mtd_partitions(struct mtd_info *);
-+int refresh_mtd_partitions(struct mtd_info *);
- 
- /*
-  * Functions dealing with the various ways of partitioning the space
---- a/include/mtd/mtd-abi.h
-+++ b/include/mtd/mtd-abi.h
-@@ -95,6 +95,7 @@ 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)
-+#define MTDREFRESH		_IO('M', 23)
- 
- /*
-  * Obsolete legacy interface. Keep it in order not to break userspace