kernel: reorganize 2.6.38 patches, clean up block2mtd patches

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@26690 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 0 insertions, 619 deletions

diff --git a/target/linux/generic/patches-2.6.38/065-rootfs_split.patch b/target/linux/generic/patches-2.6.38/065-rootfs_split.patch
deleted file mode 100644
index 7a82354dd7..0000000000
--- a/target/linux/generic/patches-2.6.38/065-rootfs_split.patch
+++ /dev/null
@@ -1,619 +0,0 @@
---- a/drivers/mtd/Kconfig
-+++ b/drivers/mtd/Kconfig
-@@ -55,6 +55,16 @@ config MTD_PARTITIONS
- 
- if MTD_PARTITIONS
- 
-+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"
- 	---help---
---- a/drivers/mtd/mtdpart.c
-+++ b/drivers/mtd/mtdpart.c
-@@ -29,6 +29,8 @@
- #include <linux/kmod.h>
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/partitions.h>
-+#include <linux/root_dev.h>
-+#include <linux/magic.h>
- #include <linux/err.h>
- 
- /* Our partition linked list */
-@@ -48,7 +50,7 @@ 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
-@@ -636,6 +638,153 @@ int mtd_del_partition(struct mtd_info *m
- }
- EXPORT_SYMBOL_GPL(mtd_del_partition);
- 
-+#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)
-+{
-+	struct squashfs_super_block sb;
-+	int len, ret;
-+
-+	ret = master->read(master, offset, sizeof(sb), &len, (void *) &sb);
-+	if (ret || (len != sizeof(sb))) {
-+		printk(KERN_ALERT "split_squashfs: error occured while reading "
-+			"from \"%s\"\n", master->name);
-+		return -EINVAL;
-+	}
-+
-+	if (SQUASHFS_MAGIC != le32_to_cpu(sb.s_magic) ) {
-+		printk(KERN_ALERT "split_squashfs: no squashfs found in \"%s\"\n",
-+			master->name);
-+		*split_offset = 0;
-+		return 0;
-+	}
-+
-+	if (le64_to_cpu((sb.bytes_used)) <= 0) {
-+		printk(KERN_ALERT "split_squashfs: squashfs is empty in \"%s\"\n",
-+			master->name);
-+		*split_offset = 0;
-+		return 0;
-+	}
-+
-+	len = (u32) le64_to_cpu(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)
-+{
-+	struct mtd_partition *dpart;
-+	struct mtd_part *slave = NULL;
-+	int ret, split_offset = 0;
-+
-+	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 = allocate_partition(master, dpart, 0, split_offset);
-+	if (IS_ERR(slave))
-+		return PTR_ERR(slave);
-+	mutex_lock(&mtd_partitions_mutex);
-+	list_add(&slave->list, &mtd_partitions);
-+	mutex_unlock(&mtd_partitions_mutex);
-+
-+	add_mtd_device(&slave->mtd);
-+
-+	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;
-+
-+		return split_rootfs_data(part->master, &part->mtd, &tpart);
-+	} 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
-@@ -652,6 +801,9 @@ int add_mtd_partitions(struct mtd_info *
- 	struct mtd_part *slave;
- 	uint64_t cur_offset = 0;
- 	int i;
-+#ifdef CONFIG_MTD_ROOTFS_SPLIT
-+	int ret;
-+#endif
- 
- 	printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
- 
-@@ -666,6 +818,21 @@ int add_mtd_partitions(struct mtd_info *
- 
- 		add_mtd_device(&slave->mtd);
- 
-+		if (!strcmp(parts[i].name, "rootfs")) {
-+#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]);
-+			/* if (ret == 0)
-+			 * 	j++; */
-+#endif
-+		}
-+
- 		cur_offset = slave->offset + slave->mtd.size;
- 	}
- 
-@@ -673,6 +840,32 @@ 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
-@@ -30,6 +30,8 @@ struct block2mtd_dev {
- 	struct block_device *blkdev;
- 	struct mtd_info mtd;
- 	struct mutex write_mutex;
-+	rwlock_t bdev_mutex;
-+	char devname[0];
- };
- 
- 
-@@ -82,6 +84,12 @@ 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);
-@@ -93,6 +101,10 @@ static int block2mtd_erase(struct mtd_in
- 		instr->state = MTD_ERASE_DONE;
- 
- 	mtd_erase_callback(instr);
-+
-+done:
-+	read_unlock(&dev->bdev_mutex);
-+
- 	return err;
- }
- 
-@@ -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);
--	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;
- 
-@@ -122,10 +138,14 @@ 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);
-@@ -136,7 +156,10 @@ static int block2mtd_read(struct mtd_inf
- 		offset = 0;
- 		index++;
- 	}
--	return 0;
-+
-+done:
-+	read_unlock(&dev->bdev_mutex);
-+	return err;
- }
- 
- 
-@@ -188,12 +211,22 @@ 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;
- 
-@@ -202,6 +235,9 @@ 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;
- }
- 
-@@ -210,33 +246,109 @@ static int block2mtd_write(struct mtd_in
- static void block2mtd_sync(struct mtd_info *mtd)
- {
- 	struct block2mtd_dev *dev = mtd->priv;
-+	read_lock(&dev->bdev_mutex);
-+	if (dev->blkdev)
- 	sync_blockdev(dev->blkdev);
-+	read_unlock(&dev->bdev_mutex);
-+
- 	return;
- }
- 
- 
-+static int _open_bdev(struct block2mtd_dev *dev)
-+{
-+	const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
-+	struct block_device *bdev;
-+
-+	/* Get a handle on the device */
-+	bdev = blkdev_get_by_path(dev->devname, mode, dev);
-+#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(dev->devname);
-+		if (devt)
-+			bdev = blkdev_get_by_dev(devt, mode, dev);
-+	}
-+#endif
-+
-+	if (IS_ERR(bdev)) {
-+		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");
-+		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);
-+	blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
-+	dev->blkdev = NULL;
-+}
-+
- 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);
--		blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
--	}
--
-+	_close_bdev(dev);
- 	kfree(dev);
- }
- 
- 
--/* FIXME: ensure that mtd->size % erase_size == 0 */
--static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
-+static int block2mtd_refresh(struct mtd_info *mtd)
- {
--	const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
-+	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 = blkdev_get_by_dev(devt, FMODE_WRITE | FMODE_READ);
-+	if (!bdev || !bdev->bd_disk)
-+		err = -EINVAL;
-+#ifndef CONFIG_MTD_BLOCK2MTD_MODULE
-+	else
-+		err = rescan_partitions(bdev->bd_disk, bdev);
-+#endif
-+	if (bdev)
-+		blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
-+
-+	/* 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;
- 	char *name;
-@@ -244,36 +356,17 @@ static struct block2mtd_dev *add_device(
- 	if (!devname)
- 		return NULL;
- 
--	dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
-+	dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL);
- 	if (!dev)
- 		return NULL;
- 
--	/* Get a handle on the device */
--	bdev = blkdev_get_by_path(devname, mode, dev);
--#ifndef MODULE
--	if (IS_ERR(bdev)) {
--
--		/* We might not have rootfs mounted at this point. Try
--		   to resolve the device name by other means. */
-+	strcpy(dev->devname, devname);
- 
--		dev_t devt = name_to_dev_t(devname);
--		if (devt)
--			bdev = blkdev_get_by_dev(devt, mode, dev);
--	}
--#endif
--
--	if (IS_ERR(bdev)) {
--		ERROR("error: cannot open device %s", devname);
-+	if (_open_bdev(dev))
- 		goto devinit_err;
--	}
--	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;
--	}
- 
- 	mutex_init(&dev->write_mutex);
-+	rwlock_init(&dev->bdev_mutex);
- 
- 	/* Setup the MTD structure */
- 	/* make the name contain the block device in */
-@@ -298,6 +391,7 @@ 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
-@@ -841,6 +841,13 @@ static int mtd_ioctl(struct file *file, 
- 		file->f_pos = 0;
- 		break;
- 	}
-+#ifdef CONFIG_MTD_PARTITIONS
-+	case MTDREFRESH:
-+	{
-+		ret = refresh_mtd_partitions(mtd);
-+		break;
-+	}
-+#endif
- 
- 	case OTPGETREGIONCOUNT:
- 	case OTPGETREGIONINFO:
---- a/include/linux/mtd/mtd.h
-+++ b/include/linux/mtd/mtd.h
-@@ -125,6 +125,7 @@ struct nand_ecclayout {
- 	struct nand_oobfree oobfree[MTD_MAX_OOBFREE_ENTRIES_LARGE];
- };
- 
-+struct mtd_info;
- struct mtd_info {
- 	u_char type;
- 	uint32_t flags;
-@@ -277,6 +278,9 @@ struct mtd_info {
- 	struct device dev;
- 	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
-@@ -34,12 +34,14 @@
-  * erasesize aligned (e.g. use MTDPART_OFS_NEXTBLK).
-  */
- 
-+struct mtd_partition;
- struct mtd_partition {
- 	char *name;			/* identifier string */
- 	uint64_t size;			/* partition size */
- 	uint64_t offset;		/* offset within the master MTD space */
- 	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) */
-+	int (*refresh_partition)(struct mtd_info *);
- };
- 
- #define MTDPART_OFS_NXTBLK	(-2)
-@@ -51,6 +53,7 @@ struct mtd_info;
- 
- 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
-@@ -127,6 +127,7 @@ struct otp_info {
- #define MEMWRITEOOB64		_IOWR('M', 21, struct mtd_oob_buf64)
- #define MEMREADOOB64		_IOWR('M', 22, struct mtd_oob_buf64)
- #define MEMISLOCKED		_IOR('M', 23, struct erase_info_user)
-+#define MTDREFRESH		_IO('M', 23)
- 
- /*
-  * Obsolete legacy interface. Keep it in order not to break userspace