block: support > 16 byte CDBs for SG_IO

[sfrench/cifs-2.6.git] / block / ioctl.c

diff --git a/block/ioctl.c b/block/ioctl.c
index 7d5c3b20af451a111834efbabbdd83269085f123..d6cda8147c91ea828ea0dcd45f21d4ec6773abd6 100644 (file)
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -278,6 +278,7 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
        struct backing_dev_info *bdi;
        loff_t size;
        int ret, n;
+       unsigned int max_sectors;
 
        switch(cmd) {
        case BLKFLSBUF:
@@ -375,7 +376,9 @@ int blkdev_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd,
        case BLKDISCARDZEROES:
                return put_uint(arg, bdev_discard_zeroes_data(bdev));
        case BLKSECTGET:
-               return put_ushort(arg, queue_max_sectors(bdev_get_queue(bdev)));
+               max_sectors = min_t(unsigned int, USHRT_MAX,
+                                   queue_max_sectors(bdev_get_queue(bdev)));
+               return put_ushort(arg, max_sectors);
        case BLKROTATIONAL:
                return put_ushort(arg, !blk_queue_nonrot(bdev_get_queue(bdev)));
        case BLKRASET: