libblock: Add RTEMS_BLKIO_PURGEDEV

cpukit/libblock/include/rtems/blkdev.h

@@ -162,6 +162,7 @@ typedef struct rtems_blkdev_request {
 #define RTEMS_BLKIO_DELETED         _IO('B', 7)
 #define RTEMS_BLKIO_CAPABILITIES    _IO('B', 8)
 #define RTEMS_BLKIO_GETDISKDEV      _IOR('B', 9, rtems_disk_device *)
+#define RTEMS_BLKIO_PURGEDEV        _IO('B', 10)
 
 /** @} */
 
@@ -204,6 +205,11 @@ static inline int rtems_disk_fd_sync(int fd)
   return ioctl(fd, RTEMS_BLKIO_SYNCDEV);
 }
 
+static inline int rtems_disk_fd_purge(int fd)
+{
+  return ioctl(fd, RTEMS_BLKIO_PURGEDEV);
+}
+
 /**
  * Only consecutive multi-sector buffer requests are supported.
  *

cpukit/libblock/src/blkdev-ioctl.c

@@ -60,6 +60,10 @@ rtems_blkdev_ioctl(rtems_disk_device *dd, uint32_t req, void *argp)
             *(rtems_disk_device **) argp = dd;
             break;
 
+        case RTEMS_BLKIO_PURGEDEV:
+            rtems_bdbuf_purge_dev(dd);
+            break;
+
         default:
             errno = EINVAL;
             rc = -1;