Grow: support --array-size changes

With 2.6.30 it is possible to tell the md driver to clip an array to a
size smaller than the real size of the array.  This option gives
access to that feature.  The size change does not persist
across restarts.

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

1 files changed, 6 insertions, 3 deletions

diff --git a/ReadMe.c b/ReadMe.c
index a194479..170e395 100644
--- a/ReadMe.c
+++ b/ReadMe.c
@@ -86,11 +86,11 @@ char Version[] = Name " - v3.0-rc1 - 11th May 2009\n";
  *     At the time if writing, there is only minimal support.
  */
 
-char short_options[]="-ABCDEFGIQhVXWvqbc:i:l:p:m:n:x:u:c:d:z:U:sarfRSow1tye:";
+char short_options[]="-ABCDEFGIQhVXWZvqbc:i:l:p:m:n:x:u:c:d:z:U:sarfRSow1tye:";
 char short_bitmap_options[]=
-                   "-ABCDEFGIQhVXWvqb:c:i:l:p:m:n:x:u:c:d:z:U:sarfRSow1tye:";
+                   "-ABCDEFGIQhVXWZvqb:c:i:l:p:m:n:x:u:c:d:z:U:sarfRSow1tye:";
 char short_bitmap_auto_options[]=
-                   "-ABCDEFGIQhVXWvqb:c:i:l:p:m:n:x:u:c:d:z:U:sa:rfRSow1tye:";
+                   "-ABCDEFGIQhVXWZvqb:c:i:l:p:m:n:x:u:c:d:z:U:sa:rfRSow1tye:";
 
 struct option long_options[] = {
     {"manage",    0, 0, '@'},
@@ -182,6 +182,7 @@ struct option long_options[] = {
     {"syslog",    0, 0, 'y'},
     /* For Grow */
     {"backup-file", 1,0, BackupFile},
+    {"array-size", 1, 0, 'Z'},
 
     /* For Incremental */
     {"rebuild-map", 0, 0, 'r'},
@@ -525,6 +526,8 @@ char Help_grow[] =
 "  --backup-file= file : A file on a differt device to store data for a\n"
 "                      : short time while increasing raid-devices on a\n"
 "                      : RAID4/5/6 array. Not needed when a spare is present.\n"
+"  --array-size=  -Z   : Change visible size of array.  This does not change\n"
+"                      : any data on the device, and is not stable across restarts.\n"
 ;
 
 char Help_incr[] =