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-rw-r--r--block/compat_ioctl.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 9bd086c1a4d..4eb8e9ea4af 100644
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -747,6 +747,8 @@ long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
return compat_put_uint(arg, bdev_io_opt(bdev));
case BLKALIGNOFF:
return compat_put_int(arg, bdev_alignment_offset(bdev));
+ case BLKDISCARDZEROES:
+ return compat_put_uint(arg, bdev_discard_zeroes_data(bdev));
case BLKFLSBUF:
case BLKROSET:
case BLKDISCARD: