2 files changed, 16 insertions, 0 deletions

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index fd7e0f923b38..9ddbade72887 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -546,6 +546,20 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
                 err = ubi_leb_unmap(desc, lnum);
                 break;
         }
+
+        /* Check if logical eraseblock is mapped command */
+        case UBI_IOCEBISMAP:
+        {
+                int32_t lnum;
+
+                err = get_user(lnum, (__user int32_t *)argp);
+                if (err) {
+                        err = -EFAULT;
+                        break;
+                }
+                err = ubi_is_mapped(desc, lnum);
+                break;
+        }
 #endif
 
         default:
diff --git a/include/mtd/ubi-user.h b/include/mtd/ubi-user.h
index ee2ea2e224af..5828d7879199 100644
--- a/include/mtd/ubi-user.h
+++ b/include/mtd/ubi-user.h
@@ -137,6 +137,8 @@
 #define UBI_IOCEBMAP _IOW(UBI_VOL_IOC_MAGIC, 3, struct ubi_map_req)
 /* Unmap an eraseblock, used for debugging, disabled by default */
 #define UBI_IOCEBUNMAP _IOW(UBI_VOL_IOC_MAGIC, 4, int32_t)
+/* Check if an eraseblock is mapped, used for debugging, disabled by default */
+#define UBI_IOCEBISMAP _IOR(UBI_VOL_IOC_MAGIC, 5, int32_t)
 
 /* Maximum MTD device name length supported by UBI */
 #define MAX_UBI_MTD_NAME_LEN 127