block: add and use scsi_blk_cmd_ioctl

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>

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index fbdf0d8..a2c11f3 100644 (file)
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -690,6 +690,13 @@ int scsi_cmd_ioctl(struct request_queue *q, struct gendisk *bd_disk, fmode_t mod
 }
 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);
+
 static int __init blk_scsi_ioctl_init(void)
 {
        blk_set_cmd_filter_defaults(&blk_default_cmd_filter);

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 587cce5..b0f553b 100644 (file)
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -1735,7 +1735,7 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
        case CCISS_BIG_PASSTHRU:
                return cciss_bigpassthru(h, argp);
 
-       /* 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:
@@ -1746,9 +1746,9 @@ static int cciss_ioctl(struct block_device *bdev, fmode_t mode,
        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. */

diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index 0e376d4..7333b9e 100644 (file)
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -1744,12 +1744,11 @@ static int ub_bd_release(struct gendisk *disk, fmode_t mode)
 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;
        int ret;
 
        mutex_lock(&ub_mutex);
-       ret = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, usermem);
+       ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, usermem);
        mutex_unlock(&ub_mutex);
 
        return ret;

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index ffd5ca9..c4a60ba 100644 (file)
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -250,8 +250,8 @@ static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
        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 */

diff --git a/drivers/cdrom/cdrom.c b/drivers/cdrom/cdrom.c
index 1bbf764..55eaf47 100644 (file)
--- a/drivers/cdrom/cdrom.c
+++ b/drivers/cdrom/cdrom.c
@@ -2746,12 +2746,11 @@ int cdrom_ioctl(struct cdrom_device_info *cdi, struct block_device *bdev,
 {
        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;
 

diff --git a/drivers/ide/ide-floppy_ioctl.c b/drivers/ide/ide-floppy_ioctl.c
index d267b7a..a22ca84 100644 (file)
--- a/drivers/ide/ide-floppy_ioctl.c
+++ b/drivers/ide/ide-floppy_ioctl.c
@@ -292,8 +292,7 @@ int ide_floppy_ioctl(ide_drive_t *drive, struct block_device *bdev,
         * 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);

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index 7b3f807..b4d57bb 100644 (file)
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -1097,7 +1097,7 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode,
                        error = scsi_ioctl(sdp, cmd, p);
                        break;
                default:
-                       error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
+                       error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
                        if (error != -ENOTTY)
                                break;
                        error = scsi_ioctl(sdp, cmd, p);

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 94acd81..ca7b869 100644 (file)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -675,6 +675,8 @@ extern int blk_insert_cloned_request(struct request_queue *q,
                                     struct request *rq);
 extern void blk_delay_queue(struct request_queue *, unsigned long);
 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,