kernel: reorganize 2.6.38 patches, clean up block2mtd patches

SVN-Revision: 26690

1 files changed, 291 insertions, 0 deletions

diff --git a/target/linux/generic/patches-2.6.38/441-block2mtd_refresh.patch b/target/linux/generic/patches-2.6.38/441-block2mtd_refresh.patch
new file mode 100644
index 0000000000..24ee22f5f6
--- /dev/null
+++ b/target/linux/generic/patches-2.6.38/441-block2mtd_refresh.patch
@@ -0,0 +1,291 @@
+--- 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 +246,110 @@ 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)) {
++		dev_t devt;
++
++		/* We might not have rootfs mounted at this point. Try
++		   to resolve the device name by other means. */
++
++		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, mtd);
++	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 +357,17 @@ 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 +392,7 @@ 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 = name;