Add --data-offset flag for Create and Grow

This can be used to over-ride the automatic assignment of
data offset.
For --create, it is useful to re-create old arrays where different
   defaults applied.
For --grow it may be able to force a reshape in the reverse direction.

Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/Grow.c b/Grow.c
index 18fb3ee1..f6fe1683 100644
--- a/Grow.c
+++ b/Grow.c
@@ -1440,6 +1440,7 @@ static int reshape_container(char *container, char *devname,
 
 int Grow_reshape(char *devname, int fd,
 		 struct mddev_dev *devlist,
+		 unsigned long long data_offset,
 		 struct context *c, struct shape *s)
 {
 	/* Make some changes in the shape of an array.
@@ -1476,6 +1477,11 @@ int Grow_reshape(char *devname, int fd,
 	struct mdinfo info;
 	struct mdinfo *sra;
 
+	if (data_offset != INVALID_SECTORS) {
+		fprintf(stderr, Name ": --grow --data-offset not yet supported\n");
+		return 1;
+	}
+
 	if (ioctl(fd, GET_ARRAY_INFO, &array) < 0) {
 		pr_err("%s is not an active md array - aborting\n",
 			devname);