kernel: fix block2mtd build after removing the device refresh ioctl

fixes #13882

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37332 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/generic/patches-3.10/441-block2mtd_probe.patch

@@ -1,10 +1,10 @@
 --- a/drivers/mtd/devices/block2mtd.c
 +++ b/drivers/mtd/devices/block2mtd.c
-@@ -243,6 +243,7 @@ static int _open_bdev(struct block2mtd_d
+@@ -234,6 +234,7 @@ static struct block2mtd_dev *add_device(
  		/* We might not have rootfs mounted at this point. Try
  		   to resolve the device name by other means. */
  
 +		wait_for_device_probe();
- 		devt = name_to_dev_t(dev->devname);
+ 		dev_t devt = name_to_dev_t(devname);
  		if (devt)
  			bdev = blkdev_get_by_dev(devt, mode, dev);

target/linux/generic/patches-3.10/441-block2mtd_refresh.patch

@@ -1,268 +0,0 @@
---- 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;
-+	rwlock_t bdev_mutex;
-+	char devname[0];
- };
- 
- 
-@@ -80,6 +82,12 @@ 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);
-@@ -91,6 +99,10 @@ static int block2mtd_erase(struct mtd_in
- 		instr->state = MTD_ERASE_DONE;
- 
- 	mtd_erase_callback(instr);
-+
-+done:
-+	read_unlock(&dev->bdev_mutex);
-+
- 	return err;
- }
- 
-@@ -102,7 +114,13 @@ 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;
-+	}
- 
- 	while (len) {
- 		if ((offset + len) > PAGE_SIZE)
-@@ -112,8 +130,10 @@ static int block2mtd_read(struct mtd_inf
- 		len = len - cpylen;
- 
- 		page = page_read(dev->blkdev->bd_inode->i_mapping, index);
--		if (IS_ERR(page))
-+		if (IS_ERR(page)) {
- 			return PTR_ERR(page);
-+			goto done;
-+		}
- 
- 		memcpy(buf, page_address(page) + offset, cpylen);
- 		page_cache_release(page);
-@@ -124,7 +144,10 @@ static int block2mtd_read(struct mtd_inf
- 		offset = 0;
- 		index++;
- 	}
--	return 0;
-+
-+done:
-+	read_unlock(&dev->bdev_mutex);
-+	return err;
- }
- 
- 
-@@ -173,13 +196,22 @@ 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;
-+	}
- 
- 	mutex_lock(&dev->write_mutex);
- 	err = _block2mtd_write(dev, buf, to, len, retlen);
- 	mutex_unlock(&dev->write_mutex);
- 	if (err > 0)
- 		err = 0;
-+
-+done:
-+	read_unlock(&dev->bdev_mutex);
- 	return err;
- }
- 
-@@ -188,33 +220,110 @@ 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;
-@@ -222,36 +331,17 @@ 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)) {
-+	strcpy(dev->devname, devname);
- 
--		/* 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);
--		if (devt)
--			bdev = blkdev_get_by_dev(devt, mode, dev);
--	}
--#endif
--
--	if (IS_ERR(bdev)) {
--		ERROR("error: cannot open device %s", devname);
--		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");
-+	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 */
-@@ -276,6 +366,7 @@ 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;