You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
293 lines
6.4 KiB
Diff
293 lines
6.4 KiB
Diff
--- 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;
|