mirror of https://github.com/hak5/openwrt.git
292 lines
6.6 KiB
Diff
292 lines
6.6 KiB
Diff
--- a/drivers/mtd/devices/block2mtd.c
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+++ b/drivers/mtd/devices/block2mtd.c
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@@ -29,6 +29,8 @@ struct block2mtd_dev {
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struct block_device *blkdev;
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struct mtd_info mtd;
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struct mutex write_mutex;
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+ rwlock_t bdev_mutex;
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+ char devname[0];
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};
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@@ -81,6 +83,12 @@ static int block2mtd_erase(struct mtd_in
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size_t len = instr->len;
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int err;
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+ read_lock(&dev->bdev_mutex);
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+ if (!dev->blkdev) {
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+ err = -EINVAL;
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+ goto done;
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+ }
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+
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instr->state = MTD_ERASING;
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mutex_lock(&dev->write_mutex);
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err = _block2mtd_erase(dev, from, len);
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@@ -92,6 +100,10 @@ static int block2mtd_erase(struct mtd_in
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instr->state = MTD_ERASE_DONE;
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mtd_erase_callback(instr);
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+
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+done:
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+ read_unlock(&dev->bdev_mutex);
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+
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return err;
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}
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@@ -103,10 +115,14 @@ static int block2mtd_read(struct mtd_inf
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struct page *page;
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int index = from >> PAGE_SHIFT;
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int offset = from & (PAGE_SIZE-1);
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- int cpylen;
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+ int cpylen, err = 0;
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+
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+ read_lock(&dev->bdev_mutex);
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+ if (!dev->blkdev || (from > mtd->size)) {
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+ err = -EINVAL;
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+ goto done;
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+ }
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- if (from > mtd->size)
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- return -EINVAL;
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if (from + len > mtd->size)
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len = mtd->size - from;
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@@ -121,10 +137,14 @@ static int block2mtd_read(struct mtd_inf
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len = len - cpylen;
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page = page_read(dev->blkdev->bd_inode->i_mapping, index);
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- if (!page)
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- return -ENOMEM;
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- if (IS_ERR(page))
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- return PTR_ERR(page);
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+ if (!page) {
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+ err = -ENOMEM;
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+ goto done;
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+ }
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+ if (IS_ERR(page)) {
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+ err = PTR_ERR(page);
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+ goto done;
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+ }
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memcpy(buf, page_address(page) + offset, cpylen);
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page_cache_release(page);
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@@ -135,7 +155,10 @@ static int block2mtd_read(struct mtd_inf
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offset = 0;
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index++;
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}
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- return 0;
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+
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+done:
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+ read_unlock(&dev->bdev_mutex);
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+ return err;
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}
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@@ -187,12 +210,22 @@ static int block2mtd_write(struct mtd_in
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size_t *retlen, const u_char *buf)
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{
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struct block2mtd_dev *dev = mtd->priv;
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- int err;
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+ int err = 0;
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+
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+ read_lock(&dev->bdev_mutex);
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+ if (!dev->blkdev) {
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+ err = -EINVAL;
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+ goto done;
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+ }
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if (!len)
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- return 0;
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- if (to >= mtd->size)
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- return -ENOSPC;
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+ goto done;
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+
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+ if (to >= mtd->size) {
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+ err = -ENOSPC;
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+ goto done;
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+ }
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+
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if (to + len > mtd->size)
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len = mtd->size - to;
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@@ -201,6 +234,9 @@ static int block2mtd_write(struct mtd_in
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mutex_unlock(&dev->write_mutex);
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if (err > 0)
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err = 0;
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+
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+done:
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+ read_unlock(&dev->bdev_mutex);
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return err;
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}
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@@ -209,33 +245,110 @@ static int block2mtd_write(struct mtd_in
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static void block2mtd_sync(struct mtd_info *mtd)
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{
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struct block2mtd_dev *dev = mtd->priv;
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+ read_lock(&dev->bdev_mutex);
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+ if (dev->blkdev)
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sync_blockdev(dev->blkdev);
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+ read_unlock(&dev->bdev_mutex);
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+
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return;
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}
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+static int _open_bdev(struct block2mtd_dev *dev)
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+{
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+ const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
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+ struct block_device *bdev;
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+
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+ /* Get a handle on the device */
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+ bdev = blkdev_get_by_path(dev->devname, mode, dev);
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+#ifndef MODULE
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+ if (IS_ERR(bdev)) {
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+ dev_t devt;
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+
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+ /* We might not have rootfs mounted at this point. Try
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+ to resolve the device name by other means. */
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+
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+ devt = name_to_dev_t(dev->devname);
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+ if (devt)
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+ bdev = blkdev_get_by_dev(devt, mode, dev);
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+ }
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+#endif
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+
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+ if (IS_ERR(bdev)) {
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+ ERROR("error: cannot open device %s", dev->devname);
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+ return 1;
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+ }
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+ dev->blkdev = bdev;
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+
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+ if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
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+ ERROR("attempting to use an MTD device as a block device");
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+
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+static void _close_bdev(struct block2mtd_dev *dev)
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+{
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+ struct block_device *bdev;
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+
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+ if (!dev->blkdev)
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+ return;
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+
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+ bdev = dev->blkdev;
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+ invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping, 0, -1);
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+ blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
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+ dev->blkdev = NULL;
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+}
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+
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static void block2mtd_free_device(struct block2mtd_dev *dev)
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{
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if (!dev)
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return;
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kfree(dev->mtd.name);
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-
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- if (dev->blkdev) {
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- invalidate_mapping_pages(dev->blkdev->bd_inode->i_mapping,
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- 0, -1);
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- blkdev_put(dev->blkdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
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- }
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-
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+ _close_bdev(dev);
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kfree(dev);
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}
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-/* FIXME: ensure that mtd->size % erase_size == 0 */
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-static struct block2mtd_dev *add_device(char *devname, int erase_size, const char *mtdname)
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+static int block2mtd_refresh(struct mtd_info *mtd)
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{
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- const fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
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+ struct block2mtd_dev *dev = mtd->priv;
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struct block_device *bdev;
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+ dev_t devt;
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+ int err = 0;
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+
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+ /* no other mtd function can run at this point */
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+ write_lock(&dev->bdev_mutex);
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+
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+ /* get the device number for the whole disk */
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+ devt = MKDEV(MAJOR(dev->blkdev->bd_dev), 0);
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+
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+ /* close the old block device */
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+ _close_bdev(dev);
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+
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+ /* open the whole disk, issue a partition rescan, then */
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+ bdev = blkdev_get_by_dev(devt, FMODE_WRITE | FMODE_READ, mtd);
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+ if (!bdev || !bdev->bd_disk)
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+ err = -EINVAL;
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+#ifndef CONFIG_MTD_BLOCK2MTD_MODULE
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+ else
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+ err = rescan_partitions(bdev->bd_disk, bdev);
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+#endif
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+ if (bdev)
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+ blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL);
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+
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+ /* try to open the partition block device again */
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+ _open_bdev(dev);
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+ write_unlock(&dev->bdev_mutex);
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+
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+ return err;
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+}
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+
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+/* FIXME: ensure that mtd->size % erase_size == 0 */
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+static struct block2mtd_dev *add_device(char *devname, int erase_size, char *mtdname)
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+{
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struct block2mtd_dev *dev;
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struct mtd_partition *part;
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char *name;
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@@ -243,36 +356,17 @@ static struct block2mtd_dev *add_device(
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if (!devname)
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return NULL;
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- dev = kzalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
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+ dev = kzalloc(sizeof(struct block2mtd_dev) + strlen(devname) + 1, GFP_KERNEL);
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if (!dev)
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return NULL;
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- /* Get a handle on the device */
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- bdev = blkdev_get_by_path(devname, mode, dev);
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-#ifndef MODULE
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- if (IS_ERR(bdev)) {
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-
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- /* We might not have rootfs mounted at this point. Try
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- to resolve the device name by other means. */
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+ strcpy(dev->devname, devname);
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- dev_t devt = name_to_dev_t(devname);
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- if (devt)
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- bdev = blkdev_get_by_dev(devt, mode, dev);
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- }
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-#endif
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-
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- if (IS_ERR(bdev)) {
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- ERROR("error: cannot open device %s", devname);
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+ if (_open_bdev(dev))
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goto devinit_err;
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- }
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- dev->blkdev = bdev;
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-
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- if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
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- ERROR("attempting to use an MTD device as a block device");
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- goto devinit_err;
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- }
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mutex_init(&dev->write_mutex);
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+ rwlock_init(&dev->bdev_mutex);
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/* Setup the MTD structure */
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/* make the name contain the block device in */
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@@ -297,6 +391,7 @@ static struct block2mtd_dev *add_device(
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dev->mtd.read = block2mtd_read;
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dev->mtd.priv = dev;
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dev->mtd.owner = THIS_MODULE;
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+ dev->mtd.refresh_device = block2mtd_refresh;
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part = kzalloc(sizeof(struct mtd_partition), GFP_KERNEL);
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part->name = name;
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