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-rw-r--r--lib/libmtd_int.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/lib/libmtd_int.h b/lib/libmtd_int.h
index 7de4b42..bb48d35 100644
--- a/lib/libmtd_int.h
+++ b/lib/libmtd_int.h
@@ -43,6 +43,10 @@ extern "C" {
#define MTD_REGION_CNT "numeraseregions"
#define MTD_FLAGS "flags"
+#define OFFS64_IOCTLS_UNKNOWN 0
+#define OFFS64_IOCTLS_NOT_SUPPORTED 1
+#define OFFS64_IOCTLS_SUPPORTED 2
+
/**
* libmtd - MTD library description data structure.
* @sysfs_mtd: MTD directory in sysfs
@@ -58,6 +62,19 @@ extern "C" {
* @mtd_region_cnt: count of additional erase regions file pattern
* @mtd_flags: MTD device flags file pattern
* @sysfs_supported: non-zero if sysfs is supported by MTD
+ * @offs64_ioctls: %OFFS64_IOCTLS_SUPPORTED if 64-bit %MEMERASE64,
+ * %MEMREADOOB64, %MEMWRITEOOB64 MTD device ioctls are
+ * supported, %OFFS64_IOCTLS_NOT_SUPPORTED if not, and
+ * %OFFS64_IOCTLS_UNKNOWN if it is not known yet;
+ *
+ * Note, we cannot find out whether 64-bit ioctls are supported by MTD when we
+ * are initializing the library, because this requires an MTD device node.
+ * Indeed, we have to actually call the ioctl and check for %ENOTTY to find
+ * out whether it is supported or not.
+ *
+ * Thus, we leave %offs64_ioctls uninitialized in 'libmtd_open()', and
+ * initialize it later, when corresponding libmtd function is used, and when
+ * we actually have a device node and can invoke an ioctl command on it.
*/
struct libmtd
{
@@ -74,6 +91,7 @@ struct libmtd
char *mtd_region_cnt;
char *mtd_flags;
unsigned int sysfs_supported:1;
+ unsigned int offs64_ioctls:2;
};
int legacy_libmtd_open(void);