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Subject[22/27] block: add and use scsi_blk_cmd_ioctl
2.6.32-longterm review patch.  If anyone has any objections, please let me know.

------------------

From: Paolo Bonzini <pbonzini@redhat.com>

commit 577ebb374c78314ac4617242f509e2f5e7156649 upstream.

Introduce a wrapper around scsi_cmd_ioctl that takes a block device.

The function will then be enhanced to detect partition block devices
and, in that case, subject the ioctls to whitelisting.

Cc: linux-scsi@vger.kernel.org
Cc: Jens Axboe <axboe@kernel.dk>
Cc: James Bottomley <JBottomley@parallels.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
[bwh: Backport to 2.6.32 - adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
block/scsi_ioctl.c | 7 +++++++
drivers/block/cciss.c | 6 +++---
drivers/block/ub.c | 3 +--
drivers/block/virtio_blk.c | 4 ++--
drivers/cdrom/cdrom.c | 3 +--
drivers/ide/ide-floppy_ioctl.c | 3 +--
drivers/scsi/sd.c | 2 +-
include/linux/blkdev.h | 2 ++
8 files changed, 18 insertions(+), 12 deletions(-)

--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -689,6 +689,13 @@ int scsi_cmd_ioctl(struct request_queue
}
EXPORT_SYMBOL(scsi_cmd_ioctl);

+int scsi_cmd_blk_ioctl(struct block_device *bd, fmode_t mode,
+ unsigned int cmd, void __user *arg)
+{
+ return scsi_cmd_ioctl(bd->bd_disk->queue, bd->bd_disk, mode, cmd, arg);
+}
+EXPORT_SYMBOL(scsi_cmd_blk_ioctl);
+
int __init blk_scsi_ioctl_init(void)
{
blk_set_cmd_filter_defaults(&blk_default_cmd_filter);
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1583,7 +1583,7 @@ static int cciss_ioctl(struct block_devi
return status;
}

- /* scsi_cmd_ioctl handles these, below, though some are not */
+ /* scsi_cmd_blk_ioctl handles these, below, though some are not */
/* very meaningful for cciss. SG_IO is the main one people want. */

case SG_GET_VERSION_NUM:
@@ -1594,9 +1594,9 @@ static int cciss_ioctl(struct block_devi
case SG_EMULATED_HOST:
case SG_IO:
case SCSI_IOCTL_SEND_COMMAND:
- return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, argp);
+ return scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);

- /* scsi_cmd_ioctl would normally handle these, below, but */
+ /* scsi_cmd_blk_ioctl would normally handle these, below, but */
/* they aren't a good fit for cciss, as CD-ROMs are */
/* not supported, and we don't have any bus/target/lun */
/* which we present to the kernel. */
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -1726,10 +1726,9 @@ static int ub_bd_release(struct gendisk
static int ub_bd_ioctl(struct block_device *bdev, fmode_t mode,
unsigned int cmd, unsigned long arg)
{
- struct gendisk *disk = bdev->bd_disk;
void __user *usermem = (void __user *) arg;

- return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem);
+ return scsi_cmd_blk_ioctl(bdev, mode, cmd, usermem);
}

/*
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -200,8 +200,8 @@ static int virtblk_ioctl(struct block_de
if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
return -ENOTTY;

- return scsi_cmd_ioctl(disk->queue, disk, mode, cmd,
- (void __user *)data);
+ return scsi_cmd_blk_ioctl(bdev, mode, cmd,
+ (void __user *)data);
}

/* We provide getgeo only to please some old bootloader/partitioning tools */
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2684,12 +2684,11 @@ int cdrom_ioctl(struct cdrom_device_info
{
void __user *argp = (void __user *)arg;
int ret;
- struct gendisk *disk = bdev->bd_disk;

/*
* Try the generic SCSI command ioctl's first.
*/
- ret = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, argp);
+ ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);
if (ret != -ENOTTY)
return ret;

--- a/drivers/ide/ide-floppy_ioctl.c
+++ b/drivers/ide/ide-floppy_ioctl.c
@@ -287,8 +287,7 @@ int ide_floppy_ioctl(ide_drive_t *drive,
* and CDROM_SEND_PACKET (legacy) ioctls
*/
if (cmd != CDROM_SEND_PACKET && cmd != SCSI_IOCTL_SEND_COMMAND)
- err = scsi_cmd_ioctl(bdev->bd_disk->queue, bdev->bd_disk,
- mode, cmd, argp);
+ err = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp);

if (err == -ENOTTY)
err = generic_ide_ioctl(drive, bdev, cmd, arg);
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -838,7 +838,7 @@ static int sd_ioctl(struct block_device
case SCSI_IOCTL_GET_BUS_NUMBER:
return scsi_ioctl(sdp, cmd, p);
default:
- error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
+ error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
if (error != -ENOTTY)
return error;
}
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -777,6 +777,8 @@ extern void blk_plug_device(struct reque
extern void blk_plug_device_unlocked(struct request_queue *);
extern int blk_remove_plug(struct request_queue *);
extern void blk_recount_segments(struct request_queue *, struct bio *);
+extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
+ unsigned int, void __user *);
extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
unsigned int, void __user *);
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,



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