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-rw-r--r--src/H5Distore.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/src/H5Distore.c b/src/H5Distore.c
index d966edd..03fd598 100644
--- a/src/H5Distore.c
+++ b/src/H5Distore.c
@@ -1875,11 +1875,12 @@ H5F_istore_read(H5F_t *f, hid_t dxpl_id, const H5O_layout_t *layout,
#ifdef H5_HAVE_PARALLEL
/*
- * If MPIO is used, must bypass the chunk-cache scheme because other
- * MPI processes could be writing to other elements in the same chunk.
+ * If MPIO is used and file can be written to, we must bypass the
+ * chunk-cache scheme because other MPI processes could be writing to
+ * other elements in the same chunk.
* Do a direct write-through of only the elements requested.
*/
- || IS_H5FD_MPIO(f)
+ || (IS_H5FD_MPIO(f) && (H5F_ACC_RDWR & f->shared->flags))
#endif /* H5_HAVE_PARALLEL */
) {
H5O_layout_t l; /* temporary layout */
@@ -2062,7 +2063,7 @@ H5F_istore_write(H5F_t *f, hid_t dxpl_id, const H5O_layout_t *layout,
* MPI processes could be writing to other elements in the same chunk.
* Do a direct write-through of only the elements requested.
*/
- || IS_H5FD_MPIO(f)
+ || (IS_H5FD_MPIO(f) && (H5F_ACC_RDWR & f->shared->flags))
#endif /* H5_HAVE_PARALLEL */
) {
H5O_layout_t l; /* temporary layout */