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path: root/target/linux/generic/patches-2.6.37/441-block2mtd_refresh.patch
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Diffstat (limited to 'target/linux/generic/patches-2.6.37/441-block2mtd_refresh.patch')
-rw-r--r--target/linux/generic/patches-2.6.37/441-block2mtd_refresh.patch292
1 files changed, 0 insertions, 292 deletions
diff --git a/target/linux/generic/patches-2.6.37/441-block2mtd_refresh.patch b/target/linux/generic/patches-2.6.37/441-block2mtd_refresh.patch
deleted file mode 100644
index a1a84638f0..0000000000
--- a/target/linux/generic/patches-2.6.37/441-block2mtd_refresh.patch
+++ /dev/null
@@ -1,292 +0,0 @@
---- 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;
- }
-
-@@ -210,52 +246,29 @@ 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_exclusive(dev->blkdev, FMODE_READ|FMODE_WRITE);
-- }
-+ 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, const char *mtdname)
-+static int _open_bdev(struct block2mtd_dev *dev)
- {
- struct block_device *bdev;
-- struct block2mtd_dev *dev;
-- struct mtd_partition *part;
-- char *name;
--
-- 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_exclusive(devname, FMODE_READ|FMODE_WRITE, NULL);
-+ bdev = open_bdev_exclusive(dev->devname, FMODE_READ|FMODE_WRITE, 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);
- }
-@@ -263,17 +276,98 @@ 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_exclusive(dev->blkdev, FMODE_READ|FMODE_WRITE);
-+ 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;
-+#ifndef CONFIG_MTD_BLOCK2MTD_MODULE
-+ else
-+ err = rescan_partitions(bdev->bd_disk, bdev);
-+#endif
-+ if (bdev)
-+ close_bdev_exclusive(bdev, FMODE_READ|FMODE_WRITE);
-+
-+ /* 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;
-+
-+ 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 */
-@@ -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 = dev->mtd.name;
generated by cgit v1.2.3 (git 2.46.0) at 2024-12-27 14:06:43 +0000