Update compact dataset I/O routines to handle driver-level memory copy (#1054)

* Update compact dataset I/O routines to handle driver-level memory copy

* Combine compact I/O read/write struct into single I/O struct

Rename CTL memory copy flag and H5Fquery routine to get file driver
structure

* Add RELEASE.txt entry for new "ctl" memory copy operation

1 files changed, 23 insertions, 0 deletions

diff --git a/src/H5Fquery.c b/src/H5Fquery.c
index 04792b4..a625897 100644
--- a/src/H5Fquery.c
+++ b/src/H5Fquery.c
@@ -950,6 +950,29 @@ done:
 } /* end H5F_get_eoa() */
 
 /*-------------------------------------------------------------------------
+ * Function:    H5F_shared_get_file_driver
+ *
+ * Purpose:     Returns a pointer to the file driver structure of the
+ *              file's 'shared' structure.
+ *
+ * Return:      file handle on success/abort on failure (shouldn't fail)
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5F_shared_get_file_driver(const H5F_shared_t *f_sh, H5FD_t **file_handle)
+{
+    /* Use FUNC_ENTER_NOAPI_NOINIT_NOERR here to avoid performance issues */
+    FUNC_ENTER_NOAPI_NOINIT_NOERR
+
+    HDassert(f_sh);
+    HDassert(file_handle);
+
+    *file_handle = f_sh->lf;
+
+    FUNC_LEAVE_NOAPI(SUCCEED)
+} /* end H5F_shared_get_file_driver() */
+
+/*-------------------------------------------------------------------------
  * Function:    H5F_get_vfd_handle
  *
  * Purpose:     Returns a pointer to the file handle of the low-level file