UBI: provide an helper to check whether a LEB is mapped or not

[cascardo/linux.git] / drivers / mtd / ubi / eba.c

diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index 180eb00..32045dd 100644 (file)
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -311,6 +311,18 @@ static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum)
        spin_unlock(&ubi->ltree_lock);
 }
 
+/**
+ * ubi_eba_is_mapped - check if a LEB is mapped.
+ * @vol: volume description object
+ * @lnum: logical eraseblock number
+ *
+ * This function returns true if the LEB is mapped, false otherwise.
+ */
+bool ubi_eba_is_mapped(struct ubi_volume *vol, int lnum)
+{
+       return vol->eba_tbl[lnum] >= 0;
+}
+
 /**
  * ubi_eba_unmap_leb - un-map logical eraseblock.
  * @ubi: UBI device description object