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Subject[PATCH v6 42/43] pktcdvd: add compat_ioctl handler
Date
pkt_ioctl() implements the generic SCSI_IOCTL_SEND_COMMAND
and some cdrom ioctls by forwarding to the underlying block
device. For compat_ioctl handling, this always takes a
roundtrip through fs/compat_ioctl.c that we should try
to avoid, at least for the compatible commands.

CDROM_SEND_PACKET is an exception here, it requires special
translation in compat_blkdev_driver_ioctl().

CDROM_LAST_WRITTEN has no compat handling at the moment.

Cc: Jens Axboe <axboe@kernel.dk>
Cc: linux-block@vger.kernel.org
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/block/pktcdvd.c | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)

diff --git a/drivers/block/pktcdvd.c b/drivers/block/pktcdvd.c
index 76457003f140..ee67bf929fac 100644
--- a/drivers/block/pktcdvd.c
+++ b/drivers/block/pktcdvd.c
@@ -2663,6 +2663,28 @@ static int pkt_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd,
return ret;
}

+#ifdef CONFIG_COMPAT
+static int pkt_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg)
+{
+ switch (cmd) {
+ /* compatible */
+ case CDROMEJECT:
+ case CDROMMULTISESSION:
+ case CDROMREADTOCENTRY:
+ case SCSI_IOCTL_SEND_COMMAND:
+ return pkt_ioctl(bdev, mode, cmd, (unsigned long)compat_ptr(arg));
+
+
+ /* FIXME: no handler so far */
+ case CDROM_LAST_WRITTEN:
+ /* handled in compat_blkdev_driver_ioctl */
+ case CDROM_SEND_PACKET:
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+#endif
+
static unsigned int pkt_check_events(struct gendisk *disk,
unsigned int clearing)
{
@@ -2684,6 +2706,9 @@ static const struct block_device_operations pktcdvd_ops = {
.open = pkt_open,
.release = pkt_close,
.ioctl = pkt_ioctl,
+#ifdef CONFIG_COMPAT
+ .ioctl = pkt_compat_ioctl,
+#endif
.check_events = pkt_check_events,
};

--
2.20.0
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