block: set S_IFBLK for block devices instead of S_IFCHR

In barebox, block devices are a special case of character devices.
Nevertheless, differentiation can be useful to allow scripts iterating
over all block devices without accounting for naming, e.g.

  for dev in /dev/*; do
	test -b $dev && echo $dev: blockdevice
  done

Add the necessary support. This will break scripts that assume
test -c blockdevice to be true, but that's a quite improbable check.

Tested-by: Jules Maselbas <jmaselbas@kalray.eu>
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Link: https://lore.barebox.org/20220602195916.9061-2-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/common/block.c b/common/block.c
index 1d386edcfd..19bb81df2c 100644
--- a/common/block.c
+++ b/common/block.c
@@ -361,6 +361,14 @@ static struct cdev_operations block_ops = {
 	.discard_range = block_op_discard_range,
 };
 
+struct block_device *cdev_get_block_device(struct cdev *cdev)
+{
+	if (!cdev || cdev->ops != &block_ops)
+		return NULL;
+
+	return container_of(cdev, struct block_device, cdev);
+}
+
 int blockdevice_register(struct block_device *blk)
 {
 	loff_t size = (loff_t)blk->num_blocks * BLOCKSIZE(blk);