UBI: add ioctl for is_mapped operation

This patch adds ioctl to check if an LEB is mapped or not (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>

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 4cc31cf..6575d6a 100644 (file)
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -550,6 +550,20 @@ 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 ee2ea2e..5828d78 100644 (file)
--- 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