UBI: add ioctl for unmap operation

This patch adds ioctl for the LEB unmap operation (as a debugging
option so far).

[Re-named ioctl to make it look the same as the other one and made
 some minor stylistic changes. Artem Bityutskiy.]

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 14 insertions, 1 deletions

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 055e3f563c13..fd7e0f923b38 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -532,13 +532,26 @@ static int vol_cdev_ioctl(struct inode *inode, struct file *file,
                 err = ubi_leb_map(desc, req.lnum, req.dtype);
                 break;
         }
+
+        /* Logical eraseblock un-map command */
+        case UBI_IOCEBUNMAP:
+        {
+                int32_t lnum;
+
+                err = get_user(lnum, (__user int32_t *)argp);
+                if (err) {
+                        err = -EFAULT;
+                        break;
+                }
+                err = ubi_leb_unmap(desc, lnum);
+                break;
+        }
 #endif
 
         default:
                 err = -ENOTTY;
                 break;
         }
-
         return err;
 }