[PATCH 6/9] FIX: Verify Backup file name before reshape

[Adam Kwolek <adam.kwolek@intel.com>]

When reshape is continued in the background, backup_file is required
for user data safety. reshape_array() makes backup_file verification,
but for container operation it will be done in forked code, so check
result will be unknown for assemble.
Grow_continue() has to verify if any file name is passed in.

Signed-off-by: Adam Kwolek <adam.kwolek@intel.com>
---

 Grow.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/Grow.c b/Grow.c
index 5176425..a1e6091 100644
--- a/Grow.c
+++ b/Grow.c
@@ -3339,8 +3339,15 @@ int Grow_continue(int mdfd, struct supertype *st, struct mdinfo *info,
 		if (err)
 			return err;
 	} else {
+		if (backup_file == NULL) {
+			fprintf(stderr, Name ": Backup file name has to be "
+				"specified for reshape continuation.\n");
+			return 1;
+		}
+
 		fmt_devname(buf, st->container_dev);
 		container = buf;
+
 		switch (fork()) {
 		case -1:
 			fprintf(stderr, Name ": Cannot run child to "