Merge branch 'master' of git://git.denx.de/u-boot-tegra

[karo-tx-uboot.git] / include / mtd / ubi-user.h

diff --git a/include/mtd/ubi-user.h b/include/mtd/ubi-user.h
index c93914ad25ca55ce5d0764889dff7517d9877a68..22d90040f8d5afb8c18dac93d7a2ecbcfc25ba77 100644 (file)
--- a/include/mtd/ubi-user.h
+++ b/include/mtd/ubi-user.h
@@ -122,6 +122,16 @@
  * used. A pointer to a &struct ubi_set_vol_prop_req object is expected to be
  * passed. The object describes which property should be set, and to which value
  * it should be set.
+ *
+ * Block devices on UBI volumes
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * To create a R/O block device on top of an UBI volume the %UBI_IOCVOLCRBLK
+ * should be used. A pointer to a &struct ubi_blkcreate_req object is expected
+ * to be passed, which is not used and reserved for future usage.
+ *
+ * Conversely, to remove a block device the %UBI_IOCVOLRMBLK should be used,
+ * which takes no arguments.
  */
 
 /*
@@ -179,6 +189,10 @@
 /* Set an UBI volume property */
 #define UBI_IOCSETVOLPROP _IOW(UBI_VOL_IOC_MAGIC, 6, \
                               struct ubi_set_vol_prop_req)
+/* Create a R/O block device on top of an UBI volume */
+#define UBI_IOCVOLCRBLK _IOW(UBI_VOL_IOC_MAGIC, 7, struct ubi_blkcreate_req)
+/* Remove the R/O block device */
+#define UBI_IOCVOLRMBLK _IO(UBI_VOL_IOC_MAGIC, 8)
 
 /* Maximum MTD device name length supported by UBI */
 #define MAX_UBI_MTD_NAME_LEN 127
@@ -408,4 +422,12 @@ struct ubi_set_vol_prop_req {
        __u64 value;
 }  __packed;
 
+/**
+ * struct ubi_blkcreate_req - a data structure used in block creation requests.
+ * @padding: reserved for future, not used, has to be zeroed
+ */
+struct ubi_blkcreate_req {
+       __s8  padding[128];
+}  __packed;
+
 #endif /* __UBI_USER_H__ */