make rootfs split/detection more generic - patch can be moved to generic-2.6 after testing on other platforms (especially broadcom)

SVN-Revision: 6328

1 files changed, 414 insertions, 0 deletions

diff --git a/target/linux/atheros-2.6/patches/160-rootfs_split.patch b/target/linux/atheros-2.6/patches/160-rootfs_split.patch
new file mode 100644
index 0000000000..e2e52f6def
--- /dev/null
+++ b/target/linux/atheros-2.6/patches/160-rootfs_split.patch
@@ -0,0 +1,414 @@
+diff -ur linux.old/drivers/mtd/Kconfig linux.dev/drivers/mtd/Kconfig
+--- linux.old/drivers/mtd/Kconfig	2007-01-10 20:10:37.000000000 +0100
++++ linux.dev/drivers/mtd/Kconfig	2007-02-19 23:00:53.739457000 +0100
+@@ -49,6 +49,11 @@
+ 	  devices. Partitioning on NFTL 'devices' is a different - that's the
+ 	  'normal' form of partitioning used on a block device.
+ 
++config MTD_SPLIT_ROOTFS
++	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 -ur linux.old/drivers/mtd/mtdpart.c linux.dev/drivers/mtd/mtdpart.c
+--- linux.old/drivers/mtd/mtdpart.c	2007-01-10 20:10:37.000000000 +0100
++++ linux.dev/drivers/mtd/mtdpart.c	2007-02-20 00:01:38.587355896 +0100
+@@ -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);
+@@ -303,6 +305,173 @@
+ 	return 0;
+ }
+ 
++static u_int32_t cur_offset = 0;
++static int add_mtd_partition(struct mtd_info *master, const struct mtd_partition *part, int i)
++{
++	struct mtd_part *slave;
++	
++	/* allocate the partition structure */
++	slave = kmalloc (sizeof(*slave), GFP_KERNEL);
++	if (!slave) {
++		printk ("memory allocation error while creating partitions for \"%s\"\n",
++			master->name);
++		del_mtd_partitions(master);
++		return -ENOMEM;
++	}
++	memset(slave, 0, sizeof(*slave));
++	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.ecctype = master->ecctype;
++	slave->mtd.eccsize = master->eccsize;
++
++	slave->mtd.name = part->name;
++	slave->mtd.bank_size = master->bank_size;
++	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 = 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;
++	}
++
++	return 0;
++}
++
+ /*
+  * 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
+@@ -314,171 +483,53 @@
+ 		       const struct mtd_partition *parts,
+ 		       int nbparts)
+ {
+-	struct mtd_part *slave;
+-	u_int32_t cur_offset = 0;
+-	int i;
++	struct mtd_partition *part;
++	int i, ret = 0;
+ 
+ 	printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
+ 
+ 	for (i = 0; i < nbparts; i++) {
++		part = (struct mtd_partition *) &parts[i];
++		ret = add_mtd_partition(master, part, i);
++		if (ret)
++			return ret;
++		if (strcmp(part->name, "rootfs") == 0) {
++#ifdef CONFIG_MTD_SPLIT_ROOTFS
++			int len;
++			char buf[512];
++			struct squashfs_super_block *sb = (struct squashfs_super_block *) buf;
++#define ROOTFS_SPLIT_NAME "rootfs_data"
++			if ((master->read(master, part->offset, sizeof(struct squashfs_super_block), &len, buf) == 0) &&
++					(len == sizeof(struct squashfs_super_block)) &&
++					(*((u32 *) buf) == SQUASHFS_MAGIC) &&
++					(sb->bytes_used > 0)) {
++
++				
++				part = kmalloc(sizeof(struct mtd_partition), GFP_KERNEL);
++				memcpy(part, &parts[i], sizeof(struct mtd_partition));
++				
++				part->name = kmalloc(sizeof(ROOTFS_SPLIT_NAME) + 1, GFP_KERNEL);
++				strcpy(part->name, ROOTFS_SPLIT_NAME);
++
++				len = (u32) sb->bytes_used;
++				len += (part->offset & 0x000fffff);
++				len +=  (master->erasesize - 1);
++				len &= ~(master->erasesize - 1);
++				len -= (part->offset & 0x000fffff);
++				part->offset += len;
++				part->size -= len;
++			
++				if (len + master->erasesize < part->size)
++					ret = add_mtd_partition(master, part, i + 1);
++				else
++					kfree(part->name);
++				if (ret)
++					return ret;
+ 
+-		/* allocate the partition structure */
+-		slave = kmalloc (sizeof(*slave), GFP_KERNEL);
+-		if (!slave) {
+-			printk ("memory allocation error while creating partitions for \"%s\"\n",
+-				master->name);
+-			del_mtd_partitions(master);
+-			return -ENOMEM;
+-		}
+-		memset(slave, 0, sizeof(*slave));
+-		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.ecctype = master->ecctype;
+-		slave->mtd.eccsize = master->eccsize;
+-
+-		slave->mtd.name = parts[i].name;
+-		slave->mtd.bank_size = master->bank_size;
+-		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);
++				kfree(part);
+ 			}
+-		}
+-		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;
+-				}
+-			}
+-		} 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 /* CONFIG_MTD_SPLIT_ROOTFS */
++			ROOT_DEV = MKDEV(MTD_BLOCK_MAJOR, i);
+ 		}
+ 	}
+