1 files changed, 22 insertions, 26 deletions

diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 4f02848bb2b..7646220ca6e 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -155,7 +155,6 @@ static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)
 {
 	struct ubi_volume_desc *desc = file->private_data;
 	struct ubi_volume *vol = desc->vol;
-	loff_t new_offset;
 
 	if (vol->updating) {
 		/* Update is in progress, seeking is prohibited */
@@ -163,30 +162,7 @@ static loff_t vol_cdev_llseek(struct file *file, loff_t offset, int origin)
 		return -EBUSY;
 	}
 
-	switch (origin) {
-	case 0: /* SEEK_SET */
-		new_offset = offset;
-		break;
-	case 1: /* SEEK_CUR */
-		new_offset = file->f_pos + offset;
-		break;
-	case 2: /* SEEK_END */
-		new_offset = vol->used_bytes + offset;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	if (new_offset < 0 || new_offset > vol->used_bytes) {
-		ubi_err("bad seek %lld", new_offset);
-		return -EINVAL;
-	}
-
-	dbg_gen("seek volume %d, offset %lld, origin %d, new offset %lld",
-		vol->vol_id, offset, origin, new_offset);
-
-	file->f_pos = new_offset;
-	return new_offset;
+	return fixed_size_llseek(file, offset, origin, vol->used_bytes);
 }
 
 static int vol_cdev_fsync(struct file *file, loff_t start, loff_t end,
@@ -585,6 +561,26 @@ static long vol_cdev_ioctl(struct file *file, unsigned int cmd,
 		break;
 	}
 
+	/* Create a R/O block device on top of the UBI volume */
+	case UBI_IOCVOLCRBLK:
+	{
+		struct ubi_volume_info vi;
+
+		ubi_get_volume_info(desc, &vi);
+		err = ubiblock_create(&vi);
+		break;
+	}
+
+	/* Remove the R/O block device */
+	case UBI_IOCVOLRMBLK:
+	{
+		struct ubi_volume_info vi;
+
+		ubi_get_volume_info(desc, &vi);
+		err = ubiblock_remove(&vi);
+		break;
+	}
+
 	default:
 		err = -ENOTTY;
 		break;
@@ -735,7 +731,7 @@ static int rename_volumes(struct ubi_device *ubi,
 			goto out_free;
 		}
 
-		re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_EXCLUSIVE);
+		re->desc = ubi_open_volume(ubi->ubi_num, vol_id, UBI_READWRITE);
 		if (IS_ERR(re->desc)) {
 			err = PTR_ERR(re->desc);
 			ubi_err("cannot open volume %d, error %d", vol_id, err);