Allow resize to backup to a file.

To support resizing an array without a spare, mdadm now understands
  --backup-file=
which should point to a file for storing a backup of critical data.
This can be given to --grow which will create the file, or
--assemble which will restore from the file if needed.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/ReadMe.c b/ReadMe.c
index c508a36..448e966 100644
--- a/ReadMe.c
+++ b/ReadMe.c
@@ -172,6 +172,8 @@ struct option long_options[] = {
     {"daemonize", 0, 0, 'f'},
     {"oneshot",   0, 0, '1'},
     {"pid-file",  1, 0, 'i'},
+    /* For Grow */
+    {"backup-file", 1,0, 7},
     
     {0, 0, 0, 0}
 };