Revert "writeback: ensure that WB_SYNC_NONE writeback with sb pinned is sync"

[safe/jmp/linux-2.6] / block / compat_ioctl.c

diff --git a/block/compat_ioctl.c b/block/compat_ioctl.c
index 9bd086c..f26051f 100644 (file)
--- a/block/compat_ioctl.c
+++ b/block/compat_ioctl.c
@@ -6,6 +6,7 @@
 #include <linux/elevator.h>
 #include <linux/fd.h>
 #include <linux/hdreg.h>
+#include <linux/slab.h>
 #include <linux/syscalls.h>
 #include <linux/smp_lock.h>
 #include <linux/types.h>
@@ -747,6 +748,8 @@ 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: