ide: add support for SCSI ioctls to ide-floppy

Now that ide-floppy supports SG_IO we can add support for SCSI ioctls
(except deprecated SCSI_IOCTL_SEND_COMMAND and legacy CDROM_SEND_PACKET
ones - we can add them later iff really needed).

While at it remove handling of CDROMEJECT and CDROMCLOSETRAY ioctls from
generic_ide_ioctl():

- This prevents ide-{disk,tape,scsi} device drivers from obtaining
  REQ_TYPE_BLOCK_PC type requests which are currently unsupported by
  these drivers and which are potentially harmful (as reported by Andrew).

- There is no functionality loss since aforementioned ioctls will now be
  handled by idefloppy_ioctl()->scsi_cmd_ioctl() (for devices using
  ide-floppy driver) and by idecd_ioctl->cdrom_ioctl()->scsi_cmd_ioctl()
  (for devices using ide-cd driver).

Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 17 insertions, 1 deletions

diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index a21f585b1caa..ae8e1a64b8ad 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -99,6 +99,8 @@
 #include <linux/bitops.h>
 #include <linux/mutex.h>
 
+#include <scsi/scsi_ioctl.h>
+
 #include <asm/byteorder.h>
 #include <asm/irq.h>
 #include <asm/uaccess.h>
@@ -2099,7 +2101,21 @@ static int idefloppy_ioctl(struct inode *inode, struct file *file,
         case IDEFLOPPY_IOCTL_FORMAT_GET_PROGRESS:
                 return idefloppy_get_format_progress(drive, argp);
         }
-        return generic_ide_ioctl(drive, file, bdev, cmd, arg);
+
+        /*
+         * skip SCSI_IOCTL_SEND_COMMAND (deprecated)
+         * and CDROM_SEND_PACKET (legacy) ioctls
+         */
+        if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
+                err = scsi_cmd_ioctl(file, bdev->bd_disk->queue,
+                                        bdev->bd_disk, cmd, argp);
+        else
+                err = -ENOTTY;
+
+        if (err == -ENOTTY)
+                err = generic_ide_ioctl(drive, file, bdev, cmd, arg);
+
+        return err;
 }
 
 static int idefloppy_media_changed(struct gendisk *disk)