1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index bcc66680952..08564375d6b 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -44,6 +44,7 @@
 #include <linux/random.h>
 #include <linux/reboot.h>
 #include <linux/file.h>
+#include <linux/compat.h>
 #include <linux/delay.h>
 #include <linux/raid/md_p.h>
 #include <linux/raid/md_u.h>
@@ -5691,6 +5692,25 @@ done:
 abort:
         return err;
 }
+#ifdef CONFIG_COMPAT
+static int md_compat_ioctl(struct block_device *bdev, fmode_t mode,
+                    unsigned int cmd, unsigned long arg)
+{
+        switch (cmd) {
+        case HOT_REMOVE_DISK:
+        case HOT_ADD_DISK:
+        case SET_DISK_FAULTY:
+        case SET_BITMAP_FILE:
+                /* These take in integer arg, do not convert */
+                break;
+        default:
+                arg = (unsigned long)compat_ptr(arg);
+                break;
+        }
+
+        return md_ioctl(bdev, mode, cmd, arg);
+}
+#endif /* CONFIG_COMPAT */
 
 static int md_open(struct block_device *bdev, fmode_t mode)
 {
@@ -5756,6 +5776,9 @@ static const struct block_device_operations md_fops =
         .open           = md_open,
         .release        = md_release,
         .ioctl          = md_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = md_compat_ioctl,
+#endif
         .getgeo         = md_getgeo,
         .media_changed  = md_media_changed,
         .revalidate_disk= md_revalidate,