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-rw-r--r--src/H5Fsuper.c20
1 files changed, 9 insertions, 11 deletions
diff --git a/src/H5Fsuper.c b/src/H5Fsuper.c
index 69c7a8d..04abfb2 100644
--- a/src/H5Fsuper.c
+++ b/src/H5Fsuper.c
@@ -466,16 +466,6 @@ H5F_super_read(H5F_t *f, hid_t dxpl_id, H5G_loc_t *root_loc)
if(H5FD_sb_decode(lf, drv_name, p) < 0)
HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, FAIL, "unable to decode driver information")
} /* end if */
- else
- /* This flag is false only if a file was created with v1.6 library or
- * before and no driver info was saved in the superblock. When the file is
- * closed and superblock is written to the file, v1.8 library or after
- * doesn't write the driver info in the superblock. Otherwise, the newly
- * added driver block will overwrite the (meta)data right after the
- * superblock. SLU - 2009/3/24
- */
- shared->write_driver = FALSE;
-
} /* end if */
else {
haddr_t root_addr; /* Address of root group */
@@ -944,7 +934,15 @@ H5F_super_write(H5F_t *f, hid_t dxpl_id)
/* Encode the driver information block. */
H5_ASSIGN_OVERFLOW(driver_size, H5FD_sb_size(f->shared->lf), hsize_t, size_t);
- if(driver_size > 0 && f->shared->write_driver) {
+
+ /* Checking whether driver block address is defined here is to handle backward
+ * compatibility. If the file was created with v1.6 library or earlier and no
+ * driver info block was written in the superblock, we don't write it either even
+ * though there's some driver info. Otherwise, the driver block extended will
+ * overwrite the (meta)data right after the superblock. This situation happens to
+ * the family driver particularly. SLU - 2009/3/24
+ */
+ if(driver_size > 0 && H5F_addr_defined(f->shared->driver_addr)) {
char driver_name[9]; /* Name of driver, for driver info block */
uint8_t *dbuf = p; /* Pointer to beginning of driver info */